RU2847702C1 - Device and method for cementing the tail in a well - Google Patents

Abstract

FIELD: oil and gas production industry.

SUBSTANCE: group of inventions relates to the oil and gas industry, namely to devices and methods for cementing a wellbore in a well. The device for cementing a wellbore in a well contains a wellbore suspension unit for lowering into the well, including an upper body in the form of a pipe with an axial hole, on the lower step of which a sleeve in the form of a pipe is installed with the possibility of longitudinal movement, connected via an upper coupling to a transport pipe string. The lower step of the upper body is connected via a middle coupling to a nipple in the form of a pipe, to the lower part of which a suspension plug is connected by shear screws, interacting during the pumping of cement slurry with the delivery plug and with the axial hole of the lower barrel. A threaded sleeve is installed on the lower step of the upper body, connected by a left-hand thread to the upper step of the lower body, which is made in the form of a pipe with a stepped axial hole. In the middle step of the lower body, under the middle coupling on a nipple with the possibility of longitudinal movement, an activating sleeve and the upper step of the upper barrel are installed. The lower step of the upper barrel is connected via the lower coupling to the lower barrel, which is connected at the bottom to the shank. The device contains a stem rotation assembly, including elements for transmitting rotation from the transport pipe string to the stem to the right, clockwise, a tail suspension assembly during cementing, designed as an anchor assembly that holds the tail in a suspended position above the bottomhole during cementing, a disconnection unit, including elements for disconnecting the transport pipe string from the tailpiece, and a packer unit that hermetically separates the cement slurry in the annular space of the tailpiece from the buffer slurry located above in the well.

EFFECT: expansion of operational capabilities, reduction of operating costs and increased reliability.

15 cl, 7 dwg

Description

The group of inventions relates to the oil and gas production industry, namely to devices for cementing a liner in a well and methods for using it, and can be used in well construction.

A “Device for cementing a liner in a well” is known under Russian patent No. 2448234, IPC E21B 17/06, E21B 43/10, published on 20.04.2012, selected as an analogue (hereinafter referred to as Device A), and including:

• a shank, the lower pipe of which is equipped with a downhole assembly, including a valve unit, a plug and a shoe,

• moreover, circulation holes are made above the plug in the tailpiece,

• a disconnector that connects the tailpiece and the supporting pipe string and is made in the form of a docking unit consisting of a funnel located at the upper end of the tailpiece and an internal releasing catcher

• a release ball for disconnecting the docking unit,

• a column of filling pipes located in the tailpiece above the valve unit with a nipple connected to the lower end of the catcher and hermetically interacting with the tailpiece funnel with the possibility of longitudinal movement,

• sealing elements in moving and fixed interactions of structural elements.

A method for using Device A (“Device for cementing a liner in a well” according to Russian Federation patent No. 2448234, IPC E21B 17/06, E21B 43/10, published on 20.04.2012) is known, selected as an analogue (hereinafter referred to as Method A), including:

• assembly of the tailpiece with the valve unit, shoe, aluminum plug and funnel,

• lowering into the tail of the column of filling pipes with a nipple and a connecting unit,

• lowering the liner on the supporting string of pipes to the bottom of the well until it stops at the bottom of the well and then completely unloading the supporting string of pipes onto the liner,

• dropping the ball through the supporting column of pipes into the saddle of the connecting unit,

• injection of drilling mud and lowering of the supporting column of pipes with a catcher in order to deactivate the docking unit,

• separation of the supporting pipe string from the tailpiece,

• checking the separation of the supporting pipe string from the liner by preliminarily lifting the supporting pipe string with the filling pipe string by 1-2 meters while maintaining a hermetic interaction between the nipple and the liner funnel,

• control of load reduction on the supporting column of pipes,

• lowering and unloading the supporting column of pipes onto the tailstock by 50-60 kN,

• cementing the liner by restoring circulation through the liner, pumping and squeezing the calculated amount of cement slurry,

• lifting the column of filling pipes in order to deactivate the hermetic interaction of the nipple with the funnel of the liner,

• flushing to remove excess cement slurry that has entered the annular space above the “head” of the liner,

• final lifting of the supporting pipe string with the filling pipe string from the well and waiting for the cement to harden.

The disadvantages of the known Device A and Method A are limited operational capabilities and low operating efficiency due to the fact that:

• there is no possibility of rotation of the liner during lowering. Therefore, in the case of differential sticking, landing and hanging of the liner in the open borehole (especially in wells with large deviations from the vertical or with horizontal ends), for example, due to narrowing of its borehole due to manifestations of rock pressure or a decrease in the diameter of the borehole as a result of the formation of a colmatation clay cake on the wall of the borehole, the lack of the possibility of rotation during reciprocation of the liner may not ensure its lowering to the bottom of the borehole;

• there is no anchor unit for suspending the liner above the face, as a result of which the liner is lowered with landing on the face, which reduces the reliability of the known Device A. This is explained by the fact that in the presence of a slurry cushion at the face, as well as in the case of collapses and rock falls from the walls of the well, when landing the liner on the face, its circulation holes located in the lower part can be blocked by rock accumulated at the face and crumbled into the annular space between the liner and the wall of the well. This circumstance will not allow the restoration of circulation for squeezing the cement slurry and, consequently, cementing of the liner will not be carried out;

• in addition, in the case of a shank unloaded at the bottom, the lower part, which is most heavily loaded by the weight of the upper part, may be subject to longitudinal bending due to the loss of stability of the original shape, which will lead to a loss of the tightness of the connecting threads of the pipes of the lower part of the shank, thereby reducing the reliability of the operation of the known Device A;

• there are no suspension and displacement plugs for separating the cement slurry from the displacement slurry in order to eliminate its negative impact on the parameters of the cement slurry, which contributes to their mixing and does not ensure high-quality separation of the layers in the intervals of the lower part of the well, thereby reducing the efficiency of the work;

• There is no annular packer above the liner, which does not ensure the possibility of separating the cement slurry from the spacer solution in the upper part of the liner and does not eliminate its negative impact on the parameters of the cement slurry. This does not ensure high-quality separation of the layers in the well intervals located in the upper part of the liner and, consequently, reduces the efficiency of the work.

A device for cementing a liner in a well is known according to the Russian Federation patent “Method for cementing a liner in a well and a device for implementing it” No. 2773116, IPC E21B 33/14, published 05/30/2022, selected as a prototype (hereinafter referred to as Device P), and containing:

• upper body connected by a coupling to the transport pipe column,

• and a lower body connected to the shank,

• the upper and lower parts of the body are connected by a release device made in the form of at least two shear elements of a thickness that ensures the ability to withstand the weight load of the shank lowered into the well,

• and above and below the shear elements, at an equal distance from them, radial grooves are made, equipped with sealing elements,

• a structural element connected to the transport column of pipes, in the form of the lower stage of the upper body, hermetically installed with the possibility of longitudinal movement in the structural element connected to the tailpiece, in the form of the lower body,

• in this case, the shear elements, the upper and lower housings as connecting elements provide a connection between the transport column of pipes and the shank during the lowering and cementing processes,

• and in the process of disconnecting the transport pipe string from the shank, the shear elements, the upper and lower housings as disconnecting elements ensure the disconnection of the transport pipe string from the shank,

• a shank rotation unit, including upper and lower housings and a longitudinally movable protrusion-groove connection,

• in this case, the projections and grooves are made on the interacting annular ends of the upper and lower housings,

• in the axial opening of the structural element, connected to the transport column of pipes, in the form of the lower stage of the upper body, a suspension plug with a seat for the landing plug is hermetically installed, connected to the lower part of the upper body with shear screws,

• sealing elements in moving and fixed interactions of structural elements.

A method for cementing a liner in a well is known according to the Russian Federation patent “Method for cementing a liner in a well and a device for implementing it” No. 2773116, IPC E21B 33/14, published 05/30/2022, selected as a prototype (hereinafter referred to as Method P), and including:

• assembly of the Device P with a tailpiece and a transport column,

• lowering the liner into the well to a specified depth,

• pumping the calculated volume of cement slurry into the transport column of pipes,

• lowering a squeeze plug from the wellhead after the last portion of cement slurry and pumping it until it lands in the seat of the suspension plug,

• creation of excess pressure with further cutting of the screws and movement of the assembly of the pressing and hanging cementing plugs down to the stop ring and receiving the “Stop” signal about the completion of the cementing process,

• lowering the liner with landing on the well bottom,

• cutting off the screws by unloading the shank at the bottomhole by a weight exceeding the shank weight by at least 150%, and disconnecting the transport pipe string,

• lifting the transport column of pipes to the exit of the upper casing from the lower casing,

• washing out excess cement slurry with washing liquid while simultaneously moving and rotating the transport pipe string,

• moreover, the flushing of the shank head from excess cement slurry is carried out both directly through the tubular space of the transport string of pipes, and in reverse through the annular space,

• lifting the transport column of pipes to the surface.

In the known Device P, the uncoupling device in the form of shear elements connecting the upper and lower bodies ensures the performance of the following operations:

• suspension of the tail during the descent, as well as its pushing in the event of landing, which is the function of the suspension unit;

• suspension of the shank above the bottomhole during the cementing process, which is the function of the anchor unit;

• disconnection of the transport column from the liner, which is the function of the disconnection unit.

Due to the combination of the listed units and functions in one unit (the uncoupling device), the known Device P and Method P have the following disadvantages:

1. Limited operational capabilities due to the fact that the liner is connected to the pipe string in the uncoupling device using shear elements. This is explained by the fact that when running the liner, if it becomes stuck, stuck, or stuck in the open borehole—for example, due to borehole narrowing due to overburden pressure or borehole diameter reduction due to the formation of a mud cake on the borehole wall—it is necessary to push the liner forward by unloading the weight of the pipe string while simultaneously rotating it.

In this case, the shear elements will be subjected to an axial load transmitted to the liner, which may exceed the permissible load for which the shear elements are designed. Therefore, to prevent shear element failure and the liner from being separated from the pipe string and subsequently falling to the wellbore bottom, the loads applied to the liner during lowering must be limited to the permissible value, which may not be sufficient to push and guarantee the liner's descent into the required wellbore interval. Therefore, due to the impossibility of lowering the liner, the drilling assembly will have to be raised and lowered to ream the open hole, which requires additional time and costs.

2. Furthermore, during the lowering process, if the shank becomes stuck, tightened, or seized, it must be released by lifting. Due to the shank being seized, an axial load will be transferred to the shear elements from the upward movement of the transport column. This load may exceed the permissible load for which the shear elements are designed, resulting in shearing and the shank being torn from the lower housing. This circumstance reduces the reliability of the known Device P.

3. Since the liner is suspended above the bottomhole during cementing, the shear pins are subject to a load equal to its weight. While the cement slurry is being squeezed, the shear pin load will be insignificant. However, it will increase sharply when the tandem squeeze and hanger plugs are seated in the stop ring seat at the bottom of the liner. The shear pins will then experience an additional load equal to the product of the increased pressure and the internal cross-sectional area of the liner casing upstream of the stop ring, which the sealing elements of the hanger plug interact with. This load, combined with the liner's weight, may exceed the permissible load for which the shear pins are designed, potentially causing them to shear off, causing the liner to fall to the bottomhole, reducing the reliability of the known Device P.

4. Increased operating costs associated with the lack of an anchoring device in the known Device P. Therefore, to activate the release device and disconnect the transport string from the liner, it is necessary to land it at the wellbore bottom, which is not always possible. For example, if an exploratory well is planned to be used as a production well after completion of geological exploration, and the productive formation is located well above the bottomhole, then using the known device requires either artificially extending the liner or creating an artificial bottomhole in the wellbore in close proximity to the bottom of the productive formation.

5. The absence of a casing packer above the liner prevents the separation of the cement slurry from the spacer solution in the upper portion of the liner and does not eliminate the negative impact of the spacer solution on the cement slurry parameters when they are mixed. This prevents high-quality cementing and zonal isolation in the wellbore intervals located in the upper portion of the liner, reducing the efficiency of the known Device P and Method P.

The objective of the group of inventions is to create a technical solution for a “Device and Method for cementing a liner in a well” (hereinafter referred to as the Device and Method), free from the listed disadvantages.

The technical result of solving this problem is the expansion of operational capabilities, reduction of operating costs and increase in the operational reliability of the claimed Device and Method.

To ensure the required result, the known Device P contains:

• a liner suspension unit during lowering into the well, including the upper and lower housings and connecting elements between the liner and the transport pipe string,

• the upper body is made in the form of a pipe with an outer stepped surface and an axial hole, connected by an upper coupling to the transport column of pipes,

• and the lower body is made in the form of a pipe with a stepped axial hole, connected through the elements of the suspension unit to the tail;

• a shank rotation unit, including an upper coupling, a lower housing, a tongue-and-groove connection that is movable in the longitudinal direction, and elements for transmitting rotation from the pipe transport string to the shank,

• in this case, projections and grooves in the amount of N ₁ , evenly distributed around the circumference, are made on the interacting annular ends of the lower housing and the element of the rotation unit;

• a shank suspension unit during the cementing process, holding the shank in a stationary position above the face;

• a disconnection unit, including upper and lower housings and elements for disconnecting the transport pipe string from the tail pipe;

• a structural element connected to the upper body and hermetically installed with the possibility of longitudinal movement in the axial hole of the suspension unit element connected to the tail;

• a hanging plug with a seat for a pressing plug, hermetically installed in the axial hole of the structural element connected to the upper body, connected to it by shear screws and hermetically interacting with the axial hole of the structural element connected to the shank;

• sealing elements in moving and fixed interactions of structural elements,

ACCORDING TO THE INVENTION

• additionally contains a packer unit installed under the lower body;

• and the liner suspension unit during the cementing process, holding the liner in a stationary position above the bottomhole, is made in the form of an anchor unit located under the packer unit on the lower wellbore under the lower coupling,

• the anchor unit contains a wedge in the form of a sleeve, on the outer surface of which an inclined surface is made,

• dies in the amount of N ₂ , uniformly installed around the circumference on the inclined surface of the wedge, connected to it with the possibility of longitudinal-radial movement and interacting after activation of the anchor unit with the wall of the casing string;

• an activation unit containing a centralizer, including blades in the amount of N ₂ in the form of curved elastically deformed plates, with the convex side facing the wall of the casing string and interacting with it, the upper part of which is connected to the upper ring, and the lower part is connected to the lower ring, while the blades have the ability to move longitudinally on the lower wellbore and are evenly distributed around the circumference;

• ram pushers, placed between the wedge and the activation unit, made in the form of elastically deformable plates in the amount of N ₂ , connected in the upper part to the rams, and in the lower part connected to the body in the form of a stepped sleeve, installed on the upper ring of the brake elements and connected to it,

• the upper ring of the blades is located in the bore of the ram pusher housing,

• and in the lower part of the lower ring of blades, in the wall, through-shaped notches are made evenly spaced around the circumference in the amount of N ₂ , interacting with fingers fixedly placed on the outer surface of the lower barrel,

• wherein each shaped recess contains an inclined section and a vertical groove mating with it at the top, the bottom part of which interacts with the finger in the initial position, and the top part of the vertical groove and the surface of the inclined section interact with the finger during the process of activating the anchor assembly.

In addition, the liner suspension unit during lowering into the well contains the following additional elements for connecting the transport string of pipes to the liner:

• a collar in the form of a pipe with a stepped axial hole, connected to the upper coupling and installed with an upper annular ledge on the lower step of the upper body with the possibility of longitudinal movement,

• in this case, the upper stage of the upper body interacts hermetically and with the possibility of longitudinal movement with the axial opening of the upper coupling,

• the middle stage of the upper housing is placed in the bore of the upper stage of the cage and its lower end interacts with the upper end of the upper annular shoulder of the cage, and its upper end, after the upper coupling moves downwards, interacts with its lower end;

• a middle coupling connected to the lower stage of the upper body,

• in this case, a threaded sleeve is installed above the middle coupling with a stop at its upper end on the lower stage of the upper housing, on the outer surface of which a left-hand thread is made, connected to a mating left-hand thread made in the upper stage of the lower housing;

• an element of the suspension unit connected to the tailstock, made in the form of an upper barrel with an axial opening and a stepped outer surface, the upper stage of which is hermetically installed in the middle stage of the lower body with the possibility of longitudinal movement and the lower end interacts with the ledge of the lower stage of the lower body,

• lower coupling

• and a lower barrel with an axial hole and a stepped outer surface, connected in the upper part to the lower coupling, and in the lower part connected to the shank.

The shank rotation unit additionally contains the following elements for transmitting rotation from the pipe transport string to the shank:

• clip,

• a rotator made in the form of a stepped sleeve, mounted with the possibility of rotation on the lower stage of the upper housing,

• upper and lower trunks, made in the form of pipes,

• a lower splined connection that connects the lower step of the cage with the upper stage of the rotator with the possibility of longitudinal movement,

• on the lower annular end of which projections of the projection-groove connection are made,

• a lower keyway connecting the upper part of the lower stage of the upper barrel with the lower stage of the lower body with the possibility of longitudinal movement.

The structural element, connected to the upper body and hermetically installed with the possibility of longitudinal movement in the axial opening of the upper barrel, is made in the form of a nipple connected to the middle coupling, while the suspension plug is installed on the lower end of the nipple.

The packer unit is installed on the lower stage of the upper wellbore and contains

• a sealing element in the form of a sleeve made of elastomeric material, installed on the outer surface of the lower stage of the upper barrel,

• in this case, a fixed lower stop is installed under the sealing element on the outer surface of the lower stage of the upper barrel, interacting with the lower coupling,

• and above the upper annular end of the sealing element on the outer surface of the lower stage of the upper barrel, an upper stop is installed with the possibility of longitudinal movement,

• an activation unit containing retractable spring-loaded stops in the amount of N ₁ , uniformly placed around the circumference in the radial holes of the activating sleeve installed under the middle coupling on the nipple,

• in this case, the retractable spring-loaded stops for activating the packer unit after disconnecting the transport pipe string from the shank interact with the upper annular end of the lower body;

• the lower end of which, after the lower housing has moved downwards, interacts with the upper end of the pressure sleeve, installed on the lower stage of the upper barrel with the possibility of longitudinal movement and fixed in the initial position with shear screws,

• a unit for fixing the packer unit in the activated position, containing a stopper in the form of a movable split elastically deformable ring installed in the pressure sleeve in the expanded state and interacting with the ends with the upper stop and the pressure sleeve,

• in this case, the stopper with the inner surface of the hole, on which the thrust thread is made, interacts during downward movement during the activation of the packer unit with the corresponding thrust thread made on the outer surface of the lower stage of the upper wellbore.

The disconnection unit contains the following additional elements for disconnecting the transport pipe string from the liner:

• an upper splined connection that connects the upper stage of the cage with the middle stage of the upper body with the possibility of longitudinal movement,

• a compression spring installed on the lower stage of the upper housing in the bore of the lower stage of the cage and interacting in a pre-compressed state with the lower end of the upper annular shoulder of the cage and with the upper end of the rotator,

• in this case, in the wall of the bore of the lower stage of the cage, through grooves are made, evenly spaced around the circumference, the height of which is equal to the height of the spring in a pre-compressed state,

• and an upper keyway connecting the threaded sleeve with the lower step of the upper one.

To ensure the required result, the well-known Method P includes:

• assembly of the Device P with a tailpiece and a transport column,

• lowering the liner into the well to a specified depth,

• disconnecting the transport column from the liner while maintaining a hermetic connection between the nipple and the axial hole of the upper wellbore,

• pumping the calculated volume of cement mortar into the transport column of pipes,

• lowering the squeeze plug from the wellhead after the last portion of cement mortar and pumping it until it lands in the seat of the suspension plug,

• pumping after cutting the screws of the tandem of the pressing and hanging plugs following the cement mortar into the shank until receiving the “Stop” signal about the completion of the cementing process,

• lifting the transport column of pipes until the nipple exits the axial hole of the upper wellbore,

• washing away excess cement mortar with washing liquid,

• lifting the transport column of pipes to the surface,

ACCORDING TO THE INVENTION

• after lowering the liner to a given depth, the anchor unit is first activated to suspend the liner in the casing string, for which the transport string is raised by a certain amount to move the fingers of the activation unit along the vertical grooves upwards into the zone of their closure with the inclined surfaces of the shaped recesses, while the centralizer blades, made in the form of elastically deformed plates, are pressed against the wall of the casing string,

• and then turn the transport column to the right, clockwise, by an angle β equal to β ≥ 360 ⁰ / N _2, removing the fingers from the vertical grooves and moving the centralizer, the pusher body and the dies pushers simultaneously upward with the surfaces of the inclined sections of the shaped recesses interacting with the fingers to ensure longitudinal-radial movement of the dies along the inclined surface of the wedge,

• and by subsequent lowering of the transport column, the lower wellbore is moved, and along with it the wedge is moved downwards until the rams engage with the wall of the casing column,

• then check the adhesion of the dies to the wall of the casing by lowering and unloading the transport column onto the wedge,

• at the same time, the disconnection unit is activated to disconnect the transport column from the shank, since when the transport column moves downwards, the lower spline connection between the collar and the rotator is disconnected and the spring is further compressed,

• then rotate the transport column to the right, clockwise, to disconnect the threaded sleeve along the left thread from the lower housing with simultaneous longitudinal movement of the threaded sleeve, pressed by the spring through the rotator to the end of the middle coupling and stationary in the longitudinal direction, of the lower housing downwards with disconnection of the projections and grooves of the projection-groove connection between the rotator and the lower housing,

• then they check the disconnection of the upper casing from the lower casing by preliminary lifting of the transport column while maintaining a hermetic interaction of the nipple with the axial hole of the upper barrel,

• after receiving the “Stop” signal, the packer unit is activated by further lifting the transport column while maintaining a hermetically sealed interaction of the nipple with the axial opening of the upper wellbore, for which purpose the transport column is first lifted upward in order to install spring-loaded stops above the upper annular end of the lower body and extend them outward from the radial openings of the activating sleeve, and then the transport column is unloaded downwards for the interaction of the spring-loaded stops with the upper annular end of the lower body,

• in this case, the lower body, moving downwards along the fixed upper wellbore, moves the pressure sleeve and the upper stop downwards with its lower end, cutting off the pins, and presses the sealing element against the lower stop, compressing it until it contacts the wall of the casing,

• wherein the fixation unit holds the sealing element in a compressed state due to the interaction of the thrust threads of the inner surface of the stopper hole and the outer surface of the lower stage of the upper barrel.

The group of inventions is illustrated by drawings, where:

• Fig. 1 shows the claimed “Device for cementing a liner in a well” (hereinafter referred to as the Device) in the initial (transport) position;

• Fig. 2 shows the claimed Device in the position of unloading the transport column of pipes onto the wedge after activating the anchor unit and the disconnection unit;

• Fig. 3 shows the upper part of the claimed Device in the disconnected position;

• Fig. 4 shows the claimed device in the position of activation of the packer unit after pressing out the cement mortar;

• Fig. 5 shows an enlarged view of the extension element A in Fig. 1;

• Fig. 6 shows an enlarged view of the extension element B in Fig. 1;

• Fig. 7 shows the claimed device in the position of lifting the nipple from the upper barrel to wash out excess cement mortar.

The claimed device (Fig. 1, 2, 3, 4) contains the following units:

• a suspension unit 1 of the shank 2 during lowering into the well, including structural elements connecting the transport string of pipes 3 with the shank 2 and ensuring its movement both upward and downward when pushing the shank 2 in the event of its landing in the open borehole of the well;

• rotation unit 4 of tail 2, including elements for transmitting rotation from the transport column of pipes 3 to tail 2 to the right (clockwise);

• a shank suspension unit during the cementing process, made in the form of an anchor unit 5, holding the shank 2 in a suspended position above the face during the cementing process;

• disconnection unit 6, including elements for disconnecting the transport pipe column 3 from the tail 2;

• packer unit 7, hermetically separating the cement slurry in the annular space of shank 2 from the buffer slurry located higher in the well;

• suspension plug 8 interacting with the pressing plug 9.

The suspension unit 1 (Fig. 1) comprises an upper body 10 in the form of a pipe with an axial opening and an outer stepped surface, on the lower step 11 of which a collar 13 in the form of a branch pipe with a stepped axial opening is mounted with the possibility of longitudinal movement by the upper annular ledge 12, connected through the upper coupling 14, in which the axial opening 15 is made, with the transport column of pipes 3. The upper step 16 of the upper body 10 hermetically interacts with the possibility of longitudinal movement with the axial opening 15 of the upper coupling 14, and the middle step 17 of the upper body 10 is placed in the bore of the upper step 18 of the collar 13 and interacts with the lower end 19 with the upper end of the upper annular ledge 12 of the collar 13. The lower step 11 of the upper body 10 is connected through the middle coupling 20 to the nipple 21 made in in the form of a pipe, with the lower part of which a suspension plug 8 is hermetically connected by shear screws 22, which hermetically interacts during the pumping of cement mortar with the squeezing plug 9 and with the axial opening of the lower barrel 34.

On the lower stage 11 with an abutment against the upper end of the middle coupling 20, a threaded sleeve 23 is mounted, connected by an external left-hand thread 24 to a mating left-hand thread 25 made in the upper stage 26 of the lower housing 27, made in the form of a pipe with a stepped axial opening. In the middle stage of the lower housing 27, under the middle coupling 20, on the nipple 21, an activating sleeve 28 and an upper stage 29 of the upper barrel 30, made with an axial opening and a stepped outer surface, are mounted with the possibility of longitudinal movement. In this case, the threaded sleeve 23, the middle coupling 20, the activating sleeve 28, the upper stage 29 of the upper barrel 30 and the shoulder 31 of the lower housing 27 interact with each other in pairs with their ends. The lower stage 32 of the upper trunk 30 is connected through the lower coupling 33 with the upper part of the lower trunk 34, which is made in the form of a branch pipe with an axial opening and a stepped outer surface and is connected at the bottom with the tailpiece 2. The lower end 35 of the upper coupling 14 and the upper end 36 of the middle stage 17 of the upper trunk 10 interact with each other when the tailpiece 2 is pushed by the weight of the transport column of pipes 3.

The rotation unit 4 contains the following elements for transmitting rotation to the right (clockwise) from the transport column of pipes 3 to the shank 2: the upper coupling 14, the collar 13, the rotator 37 made in the form of a stepped sleeve mounted with the possibility of rotation on the lower step 11 of the upper body 10, a lower spline connection 38 movable in the longitudinal direction, connecting the lower ledge 39 of the collar 13 with the upper step of the rotator 37, the lower annular end of which interacts with the upper end of the lower body 27 by a projection-groove connection 40. In this case, the projections and grooves are uniformly distributed around the circumference, and the number of both projections and grooves is equal to N ₁ . The lower housing 27 transmits rotation through the longitudinally movable lower keyway 41 from the lower stage of the lower housing 27 to the upper part of the lower stage 32 of the upper barrel 30, which transmits rotation to the shank 2 through the lower coupling 33 and the lower barrel 34.

The packer unit 7 comprises a sealing element 42 in the form of a sleeve made of elastomeric material, installed on the outer surface of the lower stage 32 of the upper barrel 30, wherein under the sealing element 42 on the outer surface of the lower stage 32 a fixed lower stop 43 interacting with the lower coupling 33 is installed, and above the sealing element 42 on the outer surface of the lower stage 32 an upper stop 44 is installed with the possibility of longitudinal movement.

The activation unit 45 of the packer unit 7 (Fig. 1 and 5) contains N ₁ retractable spring-loaded stops 46, uniformly placed around the circumference in the radial holes of the activating sleeve 28. The stops 46, when the packer unit 7 is activated after the transport string of pipes 3 is disconnected from the shank 2, being spring-loaded, move outward from the radial holes of the activating sleeve 28 and interact with the upper annular end of the lower body 27, displacing it downwards when lowering the transport string 3. In this case, the lower end of the lower body 27 interacts with the upper end of the pressure sleeve 47, installed on the lower stage 32 of the upper barrel 30 with the possibility of longitudinal movement and fixed in the initial position by shear screws 48. The pressure sleeve 47, by shearing the screws 48, displaces the movable upper stop 44 downwards, compressing sealing element 42 until it contacts the wall of casing column 49.

The fixation unit 50 (Fig. 1 and 6) of the packer unit 7 in the activated position contains a stopper 51 in the form of a movable split elastically deformable ring installed in the pressure sleeve 47 on the lower stage 32 of the upper barrel 30 in the relaxed state and interacting with the ends with the upper stop 44 and the pressure sleeve 47. In this case, the stopper 51 with the inner surface of the hole, on which the stop thread 52 is made, interacts when moving downwards during the activation of the packer unit 7 with the mating stop thread 53 made on the outer surface of the lower stage 32 of the upper barrel 30, fixing the sealing element 42 in the compressed position.

The anchor unit 5 contains a wedge 54, made in the form of a sleeve and installed on the lower barrel 34 under the lower coupling 33, and dies 55 in the amount of N ₂ , uniformly installed along the circumference on the inclined surface 56 of the wedge 54, connected to it with the possibility of longitudinal-radial movement and interacting after activation of the anchor unit 5 with the wall of the casing string 49. The pushers of the dies 57 are made in the form of elastically deformable plates in the amount of N ₂ , connected in the upper part to the dies 55, and in the lower part connected to the body 58, made in the form of a sleeve, movable in the longitudinal direction along the lower barrel 34.

The activation unit 59 of the anchor assembly 5 comprises a centralizer 60, comprising blades 61 in a quantity of N ₂ in the form of curved elastically deformed plates, with the convex side facing the wall of the casing string 49 and in contact with it. The blades 61 are uniformly distributed around the circumference and are connected by their upper and lower parts to the upper 62 and lower 63 rings, respectively, mounted on the lower wellbore 34 with the possibility of longitudinal movement.

In this case, the upper ring 62 is placed in the bore of the body 58 and is connected to it, and in the wall of the lower ring 63, uniformly spaced around the circumference, through shaped recesses 64 are made in the amount of N ₂ , interacting with the pins 65, fixedly installed on the outer surface of the lower barrel 34. Each shaped recess 64 contains an inclined section 66 and a vertical groove 67 mating with it by the upper part, the lower part of which interacts with the pin 65 in the initial position, and the upper part of the vertical groove 67 and the surface of the inclined section 66 interact with the pin 65 in the process of activating the anchor unit 5 for the purpose of engaging the dies 55 with the wall of the casing string 49.

The unit for disconnecting 6 the transport column of pipes 3 from the tail 2 comprises an upper body 10, a lower body 27, an upper splined connection 68, which connects with the possibility of longitudinal movement the upper stage 18 of the collar 13 with the middle stage 17 of the upper body 10, an upper keyed connection 69, which connects the lower stage 11 of the upper body 10 with the threaded sleeve 23, which is pressed by the compression spring 70 through the rotator 39 to the middle coupling 20.

The compression spring 70 is mounted on the lower stage 11 of the upper housing 10 in the bore 71 of the lower stage 72 of the collar 13 and interacts in a pre-compressed state with the lower end 73 of the upper annular shoulder of the collar 13 and with the upper end 74 of the rotary unit 39. In the wall of the bore 71, through grooves 75 are uniformly spaced around the circumference, the height of which is equal to the height of the spring 70 in the pre-compressed state. Thanks to the grooves 75, the accumulation of mechanical impurities of the drilling mud in the bore 71 is prevented, which prevents possible jamming of the spring 70 when disconnecting the transport string of pipes 3 from the shank 2 and increases the operational reliability of the claimed device.

Sealing elements 76, 77, 78 79 ensure tightness in the moving and fixed interactions of the structural elements of the Device.

The claimed method of using the claimed “Device for cementing a liner in a well” is carried out as follows.

The claimed Device (Fig. 1), assembled in the initial (transport) position with the shank 2, is lowered into the well on the transport pipe string 3 to a predetermined depth. In this case, the connection of the shank 2 with the transport pipe string 3 is achieved by the interaction of the following elements of the suspension unit 1: the upper coupling 14, the collar 13 and its annular ledge 12, the lower end 19 of the middle stage 17 of the upper casing 10, the lower stage 11 of the upper casing 10, the middle coupling 20, the threaded sleeve 23 and its left-hand thread 24, the left-hand thread 25 in the upper stage 26 of the lower casing 27, the activating sleeve 28, the upper stage 29 of the upper bore 30, the ledge 31 of the lower casing 27, the lower stage 32 of the upper bore 30, the lower coupling 33 and the lower bore 34.

Unloading of the transport string of pipes 3 onto the shank 2 for pushing in the event of its landing and hanging in the open borehole of the well is carried out by the interaction of the following elements of the suspension unit 1: the upper coupling 14 and the interaction of its lower end 35 with the upper end 36 of the middle stage 17 of the upper borehole 10 (Fig. 2), the lower stage 11 of the upper borehole 10, the middle coupling 20, the activating sleeve 28, the upper stage 29 and the lower stage 32 of the upper borehole 30, the lower coupling 33 and the lower borehole 34.

Simultaneously with pushing, if necessary, rotation of the transport column of pipes 3 to the right (clockwise) is carried out, which is transmitted to the tailpiece 2 through the rotation unit 4 by the interaction of the following elements: the upper coupling 14, the collar 13, the lower splined connection 37, the rotator 39, the tongue-and-groove connection 40, the lower housing 27, the lower keyed connection 41, the upper barrel 30, the lower coupling 33 and the lower barrel 34.

After lowering the liner 2 to a given depth, the anchor unit 5 (Fig. 2) is activated in order to suspend the liner 2 in the well before cementing, for which purpose the transport string 3 is first raised by a certain amount to move the fingers 65 of the activation unit 59 along the vertical grooves 67 upwards into the zone of their closure with the surfaces of the inclined sections 66 of the figured recesses 64. This operation is carried out due to the fact that the blades 61 of the centralizer 60, made in the form of elastically deformed plates, are pressed against the wall of the casing string 49, therefore the frictional force in the contact of the blades 61 and the wall of the casing string 49 creates a braking effect, ensuring the immobility of the centralizer 60 and, consequently, the lower ring 63 relative to the casing string 49 when moving the lower wellbore 34 with the fingers 65 upwards.

Next, the lifting of the transport column 3 is stopped, ensuring its immobility in the longitudinal direction, after which it is turned to the right (clockwise) by an angle β equal to β ≥ 360 ⁰ / N ₂ , removing the fingers 65 from the vertical grooves 67 into the zone of the inclined sections 66. This operation is also carried out thanks to the braking effect created by the blades 61, which ensures the immobility of the centralizer 60 and the lower ring 63 in the diametrical plane. During the rotation process, the fingers 65, interacting with the inclined sections of the shaped recesses 64, simultaneously move the centralizer 60, the body 58 and the pushers 57 upwards relative to the lower barrel 34. At the same time, the pushers 57, elastically bending, provide longitudinal-radial movement of the dies 55 along the inclined surface 56 of the wedge 54. By subsequent lowering of the transport column 3, the lower barrel 34 is moved, and together with it the wedge 56 downwards, until the dies 55 engage with the wall of the casing column 49.

The adhesion of the rams 55 to the wall of the casing string 49 is checked by unloading the transport string of pipes 3, acting on the wedge 54 through the elements of the suspension unit 1 and thereby increasing the adhesion force of the rams 55 to the wall of the casing string 49.

At the same time, the disconnecting unit 6 (Fig. 2) is simultaneously activated to disconnect the transport column 3 from the shank 2, since the upper barrel 30 and the underlying structural elements of the suspension unit 1 will be stationary. Therefore, when the transport column 3 is unloaded and the upper coupling 14 acts on the collar 13, the lower splined connection 38 between the collar 13 and the rotator 39 will be disconnected, and the spring 70 will be further compressed.

Next, by rotating the transport column 3 to the right (clockwise), the threaded sleeve 23 is disconnected along the left thread 24 from the left thread 25 of the lower body 27. In this case, the rotation of the threaded sleeve 23 from the transport column of pipes 3 is transmitted through the upper coupling 14, the collar 13, the upper splined connection 68, the upper body 10 and the upper keyed connection 69.

The threaded sleeve 23, when rotating to the right, being pressed by the spring 70 through the rotator 39 to the end of the middle coupling 20, and remaining stationary in the longitudinal direction, will be unscrewed along the left thread 24 from the thread 25 of the lower housing 27 and move it downwards, simultaneously disconnecting the projections and grooves of the projection-groove connection 40 between the rotator 39 and the lower housing 27. In this case, the possibility of moving the lower housing 27 downwards is ensured by the movable lower keyway connection 41, and the friction force between the middle coupling 20 and the activating sleeve 28 is reduced by using the thrust bearing 80.

Next, a check is made for the disconnection of the upper body 10 from the lower body 27 (Fig. 3) by first raising the transport column 3 to a height that ensures the maintenance of a hermetic interaction between the nipple 21 and the axial opening of the upper barrel 30, without allowing the retractable spring-loaded stops 46 to exit the axial opening of the lower body 27.

In this position, the Devices pump the calculated volume of cement slurry through the transport string of pipes 3 and lower the last portion of cement slurry of the displacement plug 9 from the wellhead and pump it until it is seated in the seat of the hanging plug 8. Then, after the screws 22 are cut off, the tandem of plugs 8 and 9 is pumped after the cement slurry into the shank 2 until a “Stop” signal is received indicating the completion of the cementing process.

Next, the packer unit 7 (Fig. 4) is activated by further lifting the transport column 3 while maintaining the hermetic interaction of the nipple 21 with the axial opening of the upper barrel 30 until the spring-loaded stops 46 exit the lower housing 27, followed by their extension outward from the radial openings of the activating sleeve 28. For this, the transport column 3 is first lifted upward in order to position the spring-loaded stops 46 above the upper annular end of the lower housing 27, and then the transport column 3 is unloaded downwards to allow the extended spring-loaded stops 46 to interact with the upper end of the lower housing 27.

In this case, the lower body 27, moving downwards along the fixed upper barrel 30, moves the pressure sleeve 47 and the upper stop 44 downwards with its lower end, cutting off the pins 48, and presses the sealing element 42 against the lower stop 43, compressing it until it contacts the wall of the casing string 49. The stopper 51, moving together with the pressure sleeve 47 and being released, elastically deforming, closes with the turns of the pressure thread 52 on the turns of the mating pressure thread 53, made on the outer surface of the lower stage 32 of the upper barrel 30, fixing the sealing element 42 in a compressed state.

Next, the transport column of pipes 3 (Fig. 7) is lifted until the nipple 21 exits the axial opening of the upper shaft 30, excess cement mortar is washed out with washing liquid, after which the transport column of pipes 3 with the upper body 10 and nipple 21 is lifted to the surface.

Thus, the set of distinctive features of the claimed Device and Method provides, in comparison with the analogue and prototype:

1. Expansion of operational capabilities due to the fact that the load transfer to the liner in the event of its seizure, landing and hanging in the open wellbore is carried out through the threads and interacting ends of the suspension unit design elements and does not include shear elements, the load on which in the prototype is limited to an allowable value, which may be insufficient to guarantee the lowering of the liner into the required interval of the well.

2. Increasing the reliability of operation in the event of seating, tightening and seizure of the shank, when it becomes necessary to release it by pulling out the known Device, which is also carried out through the threads and interacting ends of the structural elements of the suspension unit and does not include shear elements.

3. Improved operational reliability during the completion of cement slurry injection and a sharp increase in pressure upon receiving the "Stop" signal, thanks to the device's inclusion of an anchor assembly. This means that the incremental load will be supported not by the shear elements, but by the wedge and plates of the anchor assembly. The interaction of these wedge and plates will generate normal compressive stresses, rather than shear stresses, which are significantly lower.

4. Reduction of operating costs due to the fact that the Device is equipped with an anchor unit, which does not require the mandatory landing of the liner on the bottomhole to disconnect the transport pipe string from the liner.

5. Increased operating efficiency due to the equipping of the Device with a packer unit, which prevents mixing of the buffer and cement solutions in the upper part of the liner and ensures improved cementing quality.

Claims (75)

1. A device for cementing a liner in a well, comprising: a liner suspension unit during lowering into the well, including the upper and lower housings and connecting elements between the liner and the transport pipe string, wherein the upper body is made in the form of a pipe with an outer stepped surface and an axial hole, connected by an upper coupling to the transport column of pipes, and the lower body is made in the form of a pipe with a stepped axial hole, connected through the elements of the suspension unit to the tail; a shank rotation unit comprising an upper coupling, a lower housing, a tongue-and-groove connection movable in the longitudinal direction, and elements for transmitting rotation from the pipe transport string to the shank, wherein the projections and grooves in the quantity N ₁ , uniformly distributed around the circumference, are made on the interacting annular ends of the lower housing and the element of the rotation unit; a liner suspension unit during the cementing process, holding the liner in a stationary position above the face; a disconnection unit including upper and lower housings and elements for disconnecting the transport pipe string from the tail pipe; a structural element connected to the upper body and hermetically installed with the possibility of longitudinal movement in the axial opening of the suspension unit element connected to the tailpiece; a suspension plug with a seat for a pressing plug, hermetically installed in the axial hole of the structural element connected to the upper body, connected to it by shear screws and hermetically interacting with the axial hole of the structural element connected to the shank; sealing elements in moving and fixed interactions of structural elements, characterized in that additionally contains a packer unit installed under the lower body; the liner suspension unit during the cementing process, which holds the liner in a stationary position above the bottomhole, is made in the form of an anchor unit located under the packer unit on the lower wellbore under the lower coupling, in this case, the anchor unit contains a wedge in the form of a sleeve, on the outer surface of which an inclined surface is made; dies in the amount of N ₂ , uniformly installed around the circumference on the inclined surface of the wedge, connected to it with the possibility of longitudinal-radial movement and interacting after activation of the anchor unit with the wall of the casing string; an activation unit containing a centralizer including blades in the amount of N ₂ in the form of curved elastically deformed plates, with the convex side facing the wall of the casing string and interacting with it, the upper part of which is connected to the upper ring, and the lower part is connected to the lower ring, wherein the blades have the ability to move longitudinally on the lower wellbore and are evenly distributed around the circumference; ram pushers, located between the wedge and the activation unit, made in the form of elastically deformable plates in the amount of N ₂ , connected in the upper part to the rams, and in the lower part connected to the housing in the form of a sleeve, mounted on the upper ring of the blades and connected to it, in this case, the upper ring of the blades is located in the bore of the ram pusher housing, and in the lower part of the lower ring of blades, in the wall, through-shaped notches are made evenly spaced around the circumference in the amount of N ₂ , interacting with fingers fixedly placed on the outer surface of the lower barrel, wherein each shaped recess contains an inclined section and a vertical groove mating with it at the top, the bottom part of which interacts with the finger in the initial position, and the top part of the vertical groove and the surface of the inclined section interact with the finger during the activation of the anchor assembly. 2. The device according to paragraph 1, characterized in that the liner suspension unit during lowering into the well contains the following additional elements for connecting the transport string of pipes to the liner: a collar in the form of a pipe with a stepped axial hole, connected to the upper coupling and installed with an upper annular ledge on the lower step of the upper body with the possibility of longitudinal movement; the middle coupling connected to the lower stage of the upper body; a threaded sleeve installed above the middle coupling with an abutment against its upper end on the lower stage of the upper housing, on the outer surface of which a left-hand thread is made, connected to a mating left-hand thread made in the upper stage of the lower housing; an element of the suspension unit, connected to the tailpiece, made in the form of an upper barrel with an axial opening and a stepped outer surface, the upper stage of which is hermetically installed in the middle stage of the lower body with the possibility of longitudinal movement and the lower end interacts with the ledge of the lower stage of the lower body; lower coupling; and a lower barrel with an axial hole and a stepped outer surface, connected to the lower coupling at the top and connected to the shank at the bottom. 3. The device according to paragraph 2, characterized in that the upper stage of the upper housing interacts hermetically and with the possibility of longitudinal movement with the axial opening of the upper coupling. 4. The device according to paragraph 2, characterized in that the middle stage of the upper housing is placed in the bore of the upper stage of the shell and interacts with the lower end of the upper annular shoulder of the shell with its lower end, and interacts with the upper end of the upper annular shoulder of the shell after the upper coupling has moved downwards with its lower end. 5. The device according to paragraph 1, characterized in that the shank rotation unit additionally contains the following elements for transmitting rotation from the pipe transport string to the shank: clip; a rotator made in the form of a stepped sleeve, mounted with the possibility of rotation on the lower step of the upper housing; upper and lower trunks, made in the form of pipes; a lower splined connection that connects the lower step of the cage with the upper stage of the rotator with the possibility of longitudinal movement; a lower keyway connecting the upper part of the lower stage of the upper barrel with the lower stage of the lower body with the possibility of longitudinal movement. 6. The device according to paragraph 5, characterized in that projections of the projection-groove connection are formed on the lower annular end of the rotator. 7. The device according to paragraph 1, characterized in that the structural element, connected to the upper body and hermetically installed with the possibility of longitudinal movement in the axial opening of the upper barrel, is made in the form of a nipple connected to the middle coupling. 8. The device according to paragraph 1, characterized in that the suspension plug is installed on the lower end of the nipple. 9. The device according to paragraph 1, characterized in that the packer unit is installed on the lower stage of the upper wellbore and contains: a sealing element in the form of a sleeve made of elastomeric material, installed on the outer surface of the lower stage of the upper barrel; a fixed lower stop installed under the sealing element on the outer surface of the lower stage of the upper barrel and interacting with the lower coupling; an upper stop installed with the possibility of longitudinal movement above the upper annular end of the sealing element on the outer surface of the lower stage of the upper barrel; an activation unit containing retractable spring-loaded stops in the amount of N ₁ , uniformly placed around the circumference in the radial holes of the activating sleeve installed under the middle coupling on the nipple; a pressure sleeve mounted on the lower stage of the upper barrel with the possibility of longitudinal movement and fixed in the initial position with shear screws; and a unit for fixing the packer unit in the activated position, containing a stopper in the form of a movable split elastically deformable ring installed in the pressure sleeve in the expanded state and interacting with the ends with the upper stop and the pressure sleeve. 10. The device according to paragraph 9, characterized in that the retractable spring-loaded stops for activating the packer unit after disconnecting the transport pipe string from the shank interact with the upper annular end of the lower body. 11. The device according to item 10, characterized in that the lower end of the lower housing, after the lower housing has moved downwards, interacts with the upper end of the pressure sleeve. 12. The device according to paragraph 9, characterized in that the stopper with the inner surface of the hole, on which a thrust thread is made, interacts, when moving downwards during the activation of the packer unit, with the corresponding thrust thread made on the outer surface of the lower stage of the upper wellbore. 13. The device according to paragraph 1, characterized in that the disconnection unit contains the following additional elements for disconnecting the transport pipe string from the tailpiece: an upper splined connection that connects the upper stage of the cage with the middle stage of the upper body with the possibility of longitudinal movement; a compression spring mounted on the lower stage of the upper housing in the bore of the lower stage of the cage and interacting in a pre-compressed state with the lower end of the upper annular shoulder of the cage and with the upper end of the rotator; and the upper keyway connecting the threaded sleeve to the lower stage of the upper housing. 14. The device according to paragraph 13, characterized in that in the wall of the bore of the lower stage of the cage there are through grooves evenly spaced around the circumference, the height of which is equal to the height of the spring in a pre-compressed state. 15. A method of cementing a liner in a well, including: assembly of a device for cementing a liner in a well according to paragraph 1 with a liner and a transport string; lowering the liner into the well to a specified depth; disconnecting the transport column from the shank while maintaining a hermetically sealed connection between the nipple and the axial hole of the upper wellbore; pumping the calculated volume of cement mortar through the transport column of pipes; lowering the squeeze plug from the wellhead after the last portion of cement mortar and pumping it until it lands in the seat of the suspension plug; pumping after cutting the screws of the tandem of the pressing and hanging plugs following the cement mortar into the shank until receiving the “Stop” signal about the completion of the cementing process; lifting the transport column of pipes until the nipple exits the axial hole of the upper trunk; washing away excess cement mortar with washing liquid; lifting the transport column of pipes to the surface, characterized in that after lowering the liner to a given depth, the anchor unit is first activated to suspend the liner in the casing string, for which the transport string is raised by a certain amount to move the fingers of the activation unit along the vertical grooves upwards into the zone of their closure with the inclined surfaces of the shaped recesses, while the centralizer blades, made in the form of elastically deformed plates, are pressed against the wall of the casing string, and then turn the transport column to the right, clockwise, at an angle , equal to ≥360°/N ₂ , removing the fingers from the vertical grooves and moving the centralizer, the pusher body and the dies pushers simultaneously upwards with the surfaces of the inclined sections of the shaped recesses interacting with the fingers to ensure longitudinal-radial movement of the dies along the inclined surface of the wedge, and by subsequent lowering of the transport column, the lower wellbore is moved, and along with it the wedge is moved downwards until the rams engage with the wall of the casing column, Next, the adhesion of the dies to the casing wall is checked by lowering and unloading the transport string onto the wedge, at the same time, the disconnection unit is activated to disconnect the transport column from the shank, since when the transport column moves downwards, the lower spline connection between the collar and the rotator is disconnected and additional compression of the spring occurs, then rotate the transport column to the right, clockwise, to disconnect the threaded sleeve along the left thread from the lower housing with simultaneous longitudinal movement of the threaded sleeve, pressed by the spring through the rotator to the end of the middle coupling and stationary in the longitudinal direction, of the lower housing downwards with disconnection of the projections and grooves of the projection-groove connection between the rotator and the lower housing, then they check the disconnection of the upper casing from the lower casing by preliminarily lifting the transport column while maintaining a tight connection between the nipple and the axial hole of the upper barrel; after receiving the "Stop" signal, the packer unit is activated by further lifting the transport column while maintaining a hermetically sealed interaction of the nipple with the axial opening of the upper barrel, for which purpose the transport column is first lifted upward in order to install spring-loaded stops above the upper annular end of the lower body and extend them outward from the radial openings of the activating sleeve, and then the transport column is unloaded downwards for the interaction of the spring-loaded stops with the upper annular end of the lower body, in this case, the lower body, moving downwards along the stationary upper wellbore, moves the pressure sleeve and the upper stop downwards with its lower end, cutting off the pins, and presses the sealing element against the lower stop, compressing it until it contacts the wall of the casing, wherein the fixation unit holds the sealing element in a compressed state due to the interaction of the thrust threads of the inner surface of the stopper hole and the outer surface of the lower stage of the upper barrel.