CN114607291A - Sleeve shoe - Google Patents

Abstract

The present disclosure provides a casing shoe, which belongs to the field of oilfield cementing operations. The casing shoe includes a hydraulic turbine assembly, a floating hoop assembly, a casing, a rotating sleeve and an eccentric rotating head that are coaxially connected from top to bottom in sequence, and the casing and the rotating sleeve and between the rotating sleeve and the eccentric rotating head are all rotatably connected ; The hydraulic turbine assembly and the floating hoop assembly are located in the casing, and the floating hoop assembly is located above the hydraulic turbine assembly. The hydraulic turbine assembly is used to drive the rotating sleeve to rotate relative to the casing under the action of hydraulic force, and the outer wall of the rotating sleeve is along the circumference of the rotating sleeve. A plurality of drill blocks are distributed at intervals, and the plurality of drill blocks are arranged in a spiral shape. The hydraulic turbine assembly in the casing shoe can drive the rotating sleeve to rotate, and drive multiple drill blocks on the outer wall of the rotating sleeve to rotate in a spiral, so that the multiple drill blocks can be rotated and drilled. Remove wellbore obstacles and ensure the guiding function of casing shoes in horizontal wells.

Description

Casing shoes

technical field

The present disclosure relates to the field of oilfield cementing operations, in particular to a casing shoe.

Background technique

A casing shoe is a steel pup that fits at the lowermost end of a casing string to allow easy running of the casing and strengthen the bottom of the casing. Conventional casing shoes are mainly composed of two parts: a floating hoop short section and a guide head, and the guide head is located at one end of the floating hoop short section.

In the related art, the guide head part of the conventional casing shoe is generally processed into a hemispherical arc shape with a smooth surface, which is used to reduce the contact friction with the wellbore wall, especially when the casing passes through the irregular wellbore section of the wellbore wall. It is convenient to overcome the resistance in the well, and can better guide the casing to run smoothly.

The lowering of the casing mainly depends on the lowering of the casing by its own weight and the guidance of the casing shoe. However, due to its special wellbore trajectory in horizontal wells, the lateral pressure of the casing on the well wall is very large during the casing running process, which greatly increases the frictional resistance of the casing running. Once the casing is blocked during the running process, the guiding function of the conventional casing shoe will be invalid, and the casing cannot be continued to be run.

SUMMARY OF THE INVENTION

The embodiments of the present disclosure provide a casing shoe, which can ensure the guiding function of the casing shoe in a horizontal well. The technical solution is as follows:

An embodiment of the present disclosure provides a casing shoe, which includes a hydraulic turbine assembly, a floating hoop assembly, a casing, a rotating sleeve, and an eccentric rotating head that are coaxially connected in sequence from top to bottom. The rotating sleeves and between the rotating sleeves and the eccentric rotating head are all rotatably connected;

The hydro turbine assembly and the floating hoop assembly are located in the housing, and the floating hoop assembly is located above the hydro turbine assembly, and the hydro turbine assembly is used to drive the rotating sleeve relative to the hydraulic turbine under the action of water. The casing rotates, and a plurality of drill blocks are distributed on the outer wall of the rotating sleeve at intervals along the circumferential direction of the rotating sleeve, and the plurality of drill blocks are arranged in a spiral shape.

Optionally, the hydro turbine assembly includes a support base, a turbine casing, a manifold, a rotating shaft and a rotating blade;

The supporting base, the turbine casing and the manifold are coaxially arranged in the casing in sequence from top to bottom;

The rotating blade is fixed on the rotating shaft, the rotating blade and the rotating shaft are located in the turbine casing, and one end of the rotating shaft is rotatably inserted on the supporting base, so The other end of the rotating shaft is fixedly connected with the rotating sleeve after passing through the dividing plate;

Both the support base and the distribution plate have a first liquid channel extending along the axial direction of the casing, and the first liquid channel communicates with the inner hole of the casing.

Optionally, at least one of the rotating blades is fixed on the rotating shaft, the rotating blades include a first blade and a second blade, and the outer diameter of the first blade matches the inner diameter of the casing, so The outer diameter of the second blade is smaller than the inner diameter of the casing, and a counterweight plate is fixed at one end of the second blade away from the rotating shaft.

Optionally, the counterweight plate is an arc-shaped plate, and the central angle corresponding to the arc-shaped plate is 60°˜180°.

Optionally, the eccentric rotating head has a central through hole, and the rotating sleeve has a communication hole for connecting the central through hole and the first liquid channel.

Optionally, the casing shoe further comprises a first fixing ring, a first positioning sleeve and a first bearing,

The rotating sleeve includes a first connecting shaft and a sleeve that are coaxially connected, and the outer diameter of the sleeve is larger than the outer diameter of the first connecting shaft;

The first fixing ring, the first positioning sleeve and the first bearing are sequentially sleeved outside the first connecting shaft from top to bottom, and the first fixing ring is fixedly connected to the first connecting shaft , the first positioning sleeve is movably sleeved outside the first connecting shaft and fixed at the lower end of the housing, and the first bearing is sandwiched between the first positioning sleeve and the end face of the sleeve between.

Optionally, the casing shoe further comprises a second fixing ring, a second positioning sleeve and a second bearing;

The eccentric rotating head includes a second connecting shaft and a rotating head that are coaxially connected, and the diameter of the end face of the end of the rotating head connected to the second connecting shaft is larger than the outer diameter of the second connecting shaft;

The second fixing ring, the second positioning sleeve and the second bearing are sequentially sleeved outside the second connecting shaft from top to bottom, and the second fixing ring is fixedly connected with the second connecting shaft , the second positioning sleeve is movably sleeved outside the second connecting shaft and fixed at the lower end of the rotating sleeve, and the second bearing is sandwiched between the second positioning sleeve and the end face of the rotating head between.

Optionally, the casing shoe further includes a floating hoop assembly located in the casing, the floating hoop assembly is located above the hydraulic turbine assembly, and the floating hoop assembly The valve seat, the valve rod, the spring element and the shunt base in the shell;

The valve seat is fixedly connected to the housing, and one end of the valve seat is fixedly connected to the shunt base, and the valve seat and the shunt base form a first axis extending along the axial direction of the casing. Two liquid passages, the second liquid passage communicates with the inner hole of the casing;

The valve rod is located in the second liquid channel, one end of the valve rod is provided with a blocking part, the spring member is sheathed outside the valve rod, and the spring member is sandwiched in the blocking part Between the shunt base and the diverter base, the valve rod is configured to, under the elastic force of the spring member, block the second liquid channel and disconnect the second liquid channel from the housing. Connectivity of inner pores.

Optionally, the casing shoe further includes a shut-in assembly located in the casing, the shut-in assembly is located above the floating hoop assembly, and the shut-in assembly includes a fixed seat and a sliding sleeve,

The fixing seat is fixedly connected to the housing, the fixing seat is a cylindrical structure with one end open and the other end closed, and the side wall of the fixing seat has at least one liquid circulation hole, and the at least one liquid circulation hole is used for in the inner hole connecting the inside of the fixed seat and the casing;

The sliding sleeve is located within the fixed seat, the sliding sleeve is configured to be operably slidable from a first position to a second position, and the at least one liquid is in communication when the sliding sleeve is in the first position The hole communicates between the inside of the fixing seat and the inner hole of the housing, and when the sliding sleeve is in the second position, the sliding sleeve blocks the at least one liquid flow hole to disconnect the fixing seat The interior communicates with the inner hole of the housing.

Optionally, the sliding sleeve is a cylinder with a flange plate at one end, the diameter of the flange plate is larger than the inner diameter of the fixing seat, and the other end of the sliding sleeve is located in the fixing seat.

The beneficial effects brought by the technical solutions provided by the embodiments of the present disclosure are:

By providing a casing shoe, the casing shoe includes an eccentric rotating head, when the casing is run into the deflecting section and the horizontal section of a horizontal well, due to the eccentric setting of the head of the eccentric rotating head, it can be realized when it encounters resistance. Due to the unbalanced force, the eccentric rotating head will continue to rotate with the direction of the resultant force of the resistance and guide the pipe string to go through the high resistance area and continue to the bottom of the well, overcoming obstacles, and playing a guiding role. At the same time, the casing shoe is additionally provided with a rotating sleeve and a hydraulic turbine assembly. When the casing string encounters a blockage or necking during the running process, and the eccentric rotating head cannot pass the obstacle, the hydraulic turbine assembly can further drive the rotating sleeve to rotate, and drive multiple drill blocks on the outer wall of the rotating sleeve to rotate. Multiple drill blocks can be rotated and drilled, and the function is similar to the rotary drilling of the drill bit, which can forcefully and effectively remove the wellbore obstacle and ensure the guiding function of the casing shoe in the horizontal well.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present disclosure more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a half-section view of a casing shoe provided by an embodiment of the present disclosure;

2 is a half-section view of a hydro turbine assembly provided by an embodiment of the present disclosure;

3 is a partial structural half-sectional view of a casing shoe provided by an embodiment of the present disclosure;

FIG. 4 is a half cross-sectional view of a floating hoop assembly provided by an embodiment of the present disclosure.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

FIG. 1 is a half-sectional view of a casing shoe provided by an embodiment of the present disclosure. As shown in FIG. 1 , the casing shoe 100 includes a hydraulic turbine assembly 10, a floating hoop assembly 70, and coaxially connected from top to bottom. Housing 20 , rotating sleeve 30 and eccentric rotating head 40 . The housing 20 and the rotating sleeve 30 and the rotating sleeve 30 and the eccentric rotating head 40 are all rotatably connected.

The hydro turbine assembly 10 and the floating collar assembly 70 are located within the housing 20 , and the floating collar assembly 70 is located above the hydro turbine assembly 10 . The hydro turbine assembly 10 is used to drive the rotating sleeve 30 to rotate relative to the casing 20 under the action of water power. A plurality of drill blocks 31 are distributed on the outer wall of the rotating sleeve 30 at intervals along the circumferential direction of the rotating sleeve 30 , and the plurality of drill blocks 31 are arranged in a spiral shape.

The embodiments of the present disclosure provide a casing shoe including an eccentric rotating head. When the casing is run into the build-up section and the horizontal section of a horizontal well, due to the eccentric arrangement of the head of the eccentric rotating head, it is possible to realize Due to the unbalanced force when it encounters resistance, the eccentric rotating head will continue to rotate with the direction of the resultant force of the resistance and guide the pipe string to go through the high resistance area and continue to go deep into the bottom of the well and cross the obstacles, playing a guiding role. At the same time, the casing shoe is additionally provided with a rotating sleeve and a hydraulic turbine assembly. When the casing string encounters a blockage or necking during the running process, and the eccentric rotating head cannot pass the obstacle, the hydraulic turbine assembly can further drive the rotating sleeve to rotate, and drive multiple drill blocks on the outer wall of the rotating sleeve to rotate. Multiple drill blocks can be rotated and drilled, and the function is similar to the rotary drilling of the drill bit, which can forcefully and effectively remove the wellbore obstacle and ensure the guiding function of the casing shoe in the horizontal well.

Optionally, the plurality of drill blocks 31 are made of tungsten carbide cemented carbide materials to ensure their structural strength and toughness, and the plurality of drill blocks 31 are welded and fixed on the outer wall of the rotating sleeve 30 to ensure the connection with the rotating sleeve 30. strength.

FIG. 2 is a half-section view of a hydro turbine assembly provided by an embodiment of the present disclosure. As shown in FIG. 2 , the hydro turbine assembly 10 includes a support base 11 , a turbine casing 12 , a flow splitter plate 13 , a rotating shaft 14 and rotating blades 141. The support base 11 , the turbine casing 12 and the manifold 13 are coaxially arranged in the casing 20 in sequence from top to bottom. The rotating blade 141 is fixed on the rotating shaft 14, and the rotating blade 141 and the rotating shaft 14 are located in the turbine casing 12. One end of the rotating shaft 14 is rotatably inserted on the support base 11, and the other end of the rotating shaft 14 passes through The distribution plate 13 is then fixedly connected with the rotating sleeve 30 (see FIG. 3 ). The supporting base 11 and the distribution plate 13 both have a first liquid channel extending along the axial direction of the casing 20 , and the first liquid channel is communicated with the inner hole of the casing 20 .

Exemplarily, the supporting base 11 has a first positioning hole 11a and at least one first communication hole 11b arranged around the first positioning hole 11a. The distribution plate 13 has a second positioning hole 13a and at least one second communication hole 13b surrounding the second positioning hole 13a. The axes of the first positioning hole 11 a and the second positioning hole 13 a coincide with the axis of the housing 20 . One end of the rotating shaft 14 is inserted into the first positioning hole 11a, and the other end of the rotating shaft 14 passes through the second positioning hole 13a. By arranging the first positioning hole 11a and the second positioning hole 13a, the axial positioning of the rotating shaft 14 can be facilitated.

Wherein, at least one first communication hole 11b and at least one second communication hole 13b communicate with the inner hole of the turbine casing 12 to form a first liquid channel.

Because the best way to improve the cementing displacement efficiency is the movable casing and turbulent flow displacement. However, in actual construction, the movable casing is difficult to implement due to various difficulties. This is especially true for horizontal wells, especially the wide side and narrow side of the pipe string in the horizontal section under the self-weight operation, the drilling fluid at the narrow side cannot participate in the circulation of mud, cement injection and slurry replacement, so the cementing of the horizontal section It is difficult to improve the quality.

However, with the casing shoe provided by the embodiment of the present disclosure, during specific use, the fluid enters the first liquid channel after being injected into the inner hole of the housing 20 . That is, it flows into the turbine casing 12 through at least one first communication hole 11 b on the support base 11 , and flows out from at least one second communication hole 13 b on the manifold 13 .

At this time, the rotating blades 141 and the rotating shaft 14 in the turbine casing 12 can perform a certain period of rotation motion driven by the fluid. With the movement of the rotating blades 141 , the splitter plate 11 will generate periodic pressure waves to form axial vibration generating waves. Waves can act on the medium, destroy the inter-particle and intermolecular structure of the medium, change its original physical and chemical properties, and interfere in some reaction processes. In this way, the drilling fluid at the narrow side will be replaced more completely, which can significantly improve the cementing replacement efficiency in the horizontal section, avoid the generation of micro-gap, and improve the cementing quality.

Optionally, a plurality of annular sealing rings 12a are provided between the outer peripheral wall of the turbine casing 12 and the inner peripheral wall of the casing 20 . A plurality of annular sealing rings 12a are located at both ends of the turbine casing 12, respectively.

Optionally, at least one rotating blade 141 is fixed on the rotating shaft 14, the rotating blade 141 includes a first blade 141a and a second blade 141b, the outer diameter of the first blade 141a matches the inner diameter of the housing 20, and the second blade 141b The outer diameter of the second vane 141b is smaller than the inner diameter of the housing 20, and the counterweight plate 15 is fixed to the end of the second blade 141b away from the rotating shaft 14.

By fixing the weight plate 15 on the second blade 141b with a smaller size, the weight plate 15 can follow the rotating blade 141 to perform periodic rotation to form radial vibration. Therefore, the casing shoe provided by the embodiment of the present disclosure can generate axial and radial bidirectional vibration waves, which is beneficial to further improve the displacement efficiency of the annulus.

Optionally, the weight plate 15 is an arc-shaped plate, and the central angle corresponding to the arc-shaped plate is 60°˜180°.

If the central angle corresponding to the arc-shaped plate is too large, the weight of the arc-shaped plate is too large, and the eccentric vibration effect will be weakened under the counteracting effect of the equivalent centrifugal force, and the radial vibration wave will not be generated. If the central angle corresponding to the arc-shaped plate is too small, the weight of the arc-shaped plate is too small to generate radial vibration waves.

Fig. 3 is a half-sectional view of a part of the structure of a casing shoe provided by an embodiment of the present disclosure. As shown in Fig. 3 , the eccentric rotating head 40 has a central through hole 40a, and the rotating sleeve 30 has a central through hole 40a for communicating with the central through hole 40a. and the communication hole 30a of the first liquid channel.

After the fluid flows out from the first liquid channel, it can flow into the inner hole of the housing 20 through the communication hole 30a on the rotating sleeve 30, and then flow out from the central through hole 40a.

Optionally, the side wall of the eccentric rotating head 40 also has at least one side hole 40b for communicating with the central through hole 40a and the outside. When the fluid displacement is large, the provision of the side holes 40b facilitates the rapid discharge of the fluid at the eccentric rotating head 40 .

In the embodiment of the present disclosure, the center of gravity of the eccentric rotary head 40 is located outside the axis of the eccentric rotary head 40 .

Optionally, the eccentric rotating head 40 includes a second connecting shaft 41 and a rotating head 42 that are coaxially connected.

Among them, the rotating head 42 is an eccentric drill bit with a sharp angle at the top.

Optionally, the eccentric rotating head 40 can be made of aviation aluminum material, so that the strength and toughness of the eccentric rotating head 40 can be effectively guaranteed. At the same time, the rotational resistance between the eccentric rotating head 40 and the rotating sleeve 30 can be reduced when it rotates, so as to ensure that the eccentric rotating head 40 can smoothly pass through obstacles.

Optionally, referring to FIG. 3 , the casing shoe 100 further includes a first fixing ring 51 , a first positioning sleeve 52 and a first bearing 53 .

The rotating sleeve 30 includes a first connecting shaft 31 and a sleeve 32 that are coaxially connected.

The first fixing ring 51 , the first positioning sleeve 52 and the first bearing 53 are sequentially sleeved outside the first connecting shaft 31 from top to bottom, and the first fixing ring 51 is fixedly connected with the first connecting shaft 31 . The first positioning sleeve 52 is movably sleeved outside the first connecting shaft 31 and fixed on the lower end of the housing 20 . The first bearing 53 is sandwiched between the first positioning sleeve 52 and the end face of the sleeve 32 .

By providing the first fixing ring 51 , the rotating sleeve 30 can be prevented from coming out of the first positioning sleeve 52 . By arranging the first positioning sleeve 52, the rotating sleeve 30 can be axially positioned. By arranging the first bearing 53 , the rotating sleeve 30 can be rotated relative to the housing 20 , so as to realize the rotational connection between the rotating sleeve 30 and the housing 20 .

Optionally, between the inner peripheral wall of the first positioning sleeve 52 and the outer peripheral wall of the first connecting shaft 31 of the rotating sleeve 30, and between the outer peripheral wall of the first positioning sleeve 52 and the inner peripheral wall of the housing 20, multiple an annular seal.

Optionally, the casing shoe 100 further includes a second fixing ring 61 , a second positioning sleeve 62 and a second bearing 63 .

The second fixing ring 61 , the second positioning sleeve 62 and the second bearing 63 are sequentially sleeved outside the second connecting shaft 41 from top to bottom, and the second fixing ring 61 is fixedly connected with the second connecting shaft 41 . The second positioning sleeve 62 is movably sleeved outside the second connecting shaft 41 and fixed on the lower end of the rotating sleeve 30 . The second bearing 63 is interposed between the second positioning sleeve 62 and the end face of the rotary head 42 .

By providing the second fixing ring 61 , the eccentric rotating head 40 can be prevented from coming out of the second positioning sleeve 62 . By arranging the second positioning sleeve 62, the eccentric rotary head 40 can be axially positioned. By arranging the second bearing 63 , the eccentric rotating head 40 can be rotated relative to the rotating sleeve 30 , so as to realize the rotational connection between the rotating sleeve 30 and the eccentric rotating head 40 .

Optionally, multiple annular sealing rings are provided between the second positioning sleeve 62 and the second connecting shaft 41 of the eccentric rotating head 40 and between the second positioning sleeve 62 and the second connecting shaft 41 .

FIG. 4 is a half-sectional view of a floating hoop assembly provided by an embodiment of the present disclosure. As shown in FIG. 4 , the casing shoe 100 further includes a floating hoop assembly 70 located in the casing 20 , and the floating hoop assembly 70 is located in the hydraulic turbine assembly. 10 above. The floating hoop assembly 70 includes a valve seat 71 , a valve rod 72 , a spring member 74 and a flow splitting base 73 which are coaxially located in the housing 20 from top to bottom.

The valve seat 71 is fixedly connected to the housing 20 . One end of the valve seat 71 is fixedly connected to the branch base 73 , the valve seat 71 and the branch base 73 form a second liquid channel extending along the axial direction of the casing 20 , and the second liquid channel communicates with the inner hole of the casing 20 .

The Vare bars 72 are located between the second liquid passages. One end of the valve rod 72 has a blocking portion 721 , the spring member 74 is sheathed outside the valve rod 72 , and the spring member 74 is sandwiched between the blocking portion 721 and the flow dividing base 73 . The valve rod 72 is configured to block the second liquid passage under the elastic force of the spring member 74 , so as to disconnect the communication between the second liquid passage and the inner hole of the housing 20 .

Optionally, the valve seat 71 is a seat body with a third communication hole 71 a extending in the axial direction of the housing 20 in the middle. The diverter base 73 is a cylindrical structure with one end open and the other end closed. The open end of the diverter base 73 is fixedly connected with the Valler seat 71 by bolts. The four communication holes 73a, the third communication hole 71a and the fourth communication hole 73a communicate with each other to form a second liquid channel.

Wherein, the middle of the closed end of the shunt base 73 also has a positioning through hole, the central axis of the positioning through hole coincides with the central axis of the housing 20, and one end of the valve rod 72 is inserted into the positioning through hole.

Optionally, the closed end of the distribution base 73 has a plurality of fourth communication holes 73 a , and the plurality of fourth communication holes 73 a are arranged at intervals along the circumference of the distribution base 73 .

Under the normal state, under the elastic force of the spring member 74, the blocking portion 721 of the valve rod 72 is in contact with the valve seat 71 to block the third communication hole 71a, so the third communication hole 71a cannot communicate with the fourth communication hole 73a. , the second liquid channel is blocked.

When the fluid is injected into the inner hole of the housing 20, the fluid can overcome the elastic force of the spring member 74 and enter the second liquid channel from the third communication hole 71a on the valve seat 71. At this time, the valve rod 72 is under the action of the fluid, Moving downward, the spring member 74 is compressed, the blocking portion 721 of the valve rod 72 is separated from the valve seat 71, the third communication hole 71a can communicate with the fourth communication hole 73a, and the fluid can flow out from the fourth communication hole 73a.

In an embodiment of the present disclosure, the second liquid channel may communicate with the first liquid channel.

When the fluid flows into the fourth communication hole 73a in the reverse direction, under the action of the fluid and the spring member 74, the blocking part of the valve rod 72 will always abut against the valve seat 71 to block the third communication hole 71a, so that it is possible to Prevent fluid from flowing back and realize the functions of reverse interception and forward drainage.

Illustratively, the spring member 224 may be a spring.

Optionally, casing shoe 100 further includes shut-in assembly 80 within housing 20 . The shut-in assembly 80 is located above the floating hoop assembly 70 , and the shut-in assembly 80 includes a fixed seat 81 and a sliding sleeve 82 .

The fixing seat 81 is fixedly connected with the housing 20 , and the fixing seat 81 is a cylindrical structure with one end open and the other end closed. The side wall of the fixing seat 81 has at least one liquid circulation hole 81 a , and the at least one liquid circulation hole 81 a is used to communicate the interior of the fixing seat 81 with the inner hole of the housing 20 .

The sliding sleeve 82 is located in the fixed seat 81, and the sliding sleeve 82 is configured to be operably slid from the first position to the second position. When the sliding sleeve 82 is in the first position, the at least one liquid flow hole 81a communicates between the inside of the fixed seat 81 and the inner hole of the housing 20; when the sliding sleeve 82 is in the second position, the sliding sleeve 82 blocks the at least one liquid flow hole 81a , disconnect the communication between the interior of the fixing seat 81 and the inner hole of the housing 20 .

By arranging the shut-in assembly 80, hard shut-in can be realized to ensure that the fluid does not return when the pressure is bumped.

In specific use, when the cementing rubber plug descends to the upper end face of the sliding sleeve 82, a bump is generated, and the sliding sleeve 81 is pushed downward to close at least one liquid flow hole 81a on the fixed seat 81, so that the bottom hole can be permanently closed. At this time, even if the fluid flows back through the floating collar assembly 70, the well shut-in assembly 80 can still play the role of secondary backflow prevention.

Optionally, the sliding sleeve 82 is a cylinder with a flange plate 821 at one end, the diameter of the flange plate 821 is larger than the inner diameter of the fixing seat 81 , and the other end of the sliding sleeve 82 is located in the fixing seat 81 . By arranging the flange plate 821, the sliding sleeve 82 can be prevented from being completely slid into the fixing seat 81, which is inconvenient to take out.

The shut-in assembly 80 adopts the sliding sleeve principle, and the components that play a sealing role do not participate in the fluid circulation, which can largely avoid the erosion and damage of the circulating fluid to the sealing components.

Optionally, there is at least one first annular sealing ring 831 between the inner peripheral wall of the fixing seat 81 and the outer peripheral wall of the sliding sleeve 82 , and at least one second annular sealing ring 831 is arranged between the outer peripheral wall of the fixing seat 81 and the inner peripheral wall of the housing 20 Seal ring 832.

Optionally, the fixed base 81 and the sliding sleeve 82 are fixedly connected by pins 83 .

In the embodiment of the present disclosure, the pin 83 will be cut off when subjected to an impact force greater than 3 MPa, so that the sliding sleeve 82 slides into the fixed seat 81 to seal the at least one liquid flow hole 81a.

Optionally, casing shoe 100 includes a support sleeve 90 for supporting shut-in assembly 80 between floating collar assembly 70 and shut-in assembly 80 . The support sleeve 90 can play the role of limiting and supporting, and can effectively limit the distance between the two components during installation, and prevent the shut-in component 80 from moving downward during the pressing process, contacting the floating hoop component 70, and correcting Float hoop assembly 70 caused damage.

Optionally, the open end of the fixing seat 81 has an annular plate 811 extending outward in the radial direction of the fixing seat 81 .

Exemplarily, the support sleeve 90 is coaxially disposed on the casing 20, and the support sleeve 90 is located between the annular plate 811 and the valve seat 71 of the floating hoop assembly 70, and the support sleeve 90 is sleeved on the cylindrical structure. outside the fixed seat 81 .

The following is a brief description of the operation process of the casing shoe provided by the embodiment of the present disclosure during field application:

1. Fitting the casing shoe provided by the embodiment of the present disclosure before the casing;

2. Run casing according to the requirements of cementing operations;

3. When the casing string enters the grouting section of the open-hole construction, the casing should be moved continuously in the grouting gap, and the distance between the upper and lower movable casing should not be less than 2cm. When it is found that there are signs of resistance in the well, stop grouting, and take measures such as large-distance movable casing or kelly circulation, and then continue grouting and casing when it is normal.

4. After the casing string enters the open-hole construction section, control the lowering speed of the casing string, and it is recommended not to exceed 2 heels/min;

5. After the casing string enters the open-hole build-up section, pay attention to the slurry return at the wellhead in time. If an abnormality occurs, stop the casing running immediately for processing, and continue to run the casing after it is normal;

6. After the casing is blocked, if the upper and lower movable pipe strings still cannot be unblocked, first connect the kelly or the circulating head to open the pump for circulation, start the reaming guide head by hydraulic force to rotate to break the block, and then connect the casing to the casing. Under the condition of equipment safety, try to go up and down the movable casing as many times as possible;

7. When the casing is lowered to the design position, install the cement head according to the cementing design. After the small displacement is jacked up, the well is cleaned in a normal displacement cycle;

8. Subsequent operations such as cementing, replacing slurry and pressing rubber plugs are normally carried out in accordance with the operating procedures;

9. After the cementing rubber plug reaches the bottom, touch the pressure, record the pressure of the wellhead pressure gauge, and continue to press 3-5MPa with a small displacement to ensure that the anti-backflow check valve is normally closed.

The above are only optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection of the present disclosure. within the range.

Claims (10)

1. The casing shoe is characterized in that the casing shoe (100) comprises a hydraulic turbine assembly (10), a float collar assembly (70), a shell (20), a rotating sleeve (30) and an eccentric rotating head (40), which are coaxially connected from top to bottom, wherein the shell (20) is rotatably connected with the rotating sleeve (30), and the rotating sleeve (30) is rotatably connected with the eccentric rotating head (40);

the water turbine assembly (10) and the float collar assembly (70) are located in the shell (20), the float collar assembly (70) is located above the water turbine assembly (10), the water turbine assembly (10) is used for driving the rotary sleeve (30) to rotate relative to the shell (20) under the action of water power, a plurality of drill blocks (31) are distributed on the outer wall of the rotary sleeve (30) at intervals along the circumferential direction of the rotary sleeve (30), and the drill blocks (31) are arranged in a spiral shape.

2. The casing shoe according to claim 1, characterized in that the water turbine assembly (10) comprises a bearing base (11), a turbine housing (12), a diverter plate (13), a rotating shaft (14) and rotating blades (141);

the bearing base (11), the turbine shell (12) and the flow distribution plate (13) are sequentially and coaxially arranged in the shell (20) from top to bottom;

the rotating blades (141) are fixed on the rotating shaft (14), the rotating blades (141) and the rotating shaft (14) are positioned in the turbine shell (12), one end of the rotating shaft (14) is rotatably inserted into the bearing base (11), and the other end of the rotating shaft (14) penetrates through the flow distribution plate (13) and then is fixedly connected with the rotating sleeve (30);

the bearing base (11) and the flow distribution plate (13) are respectively provided with a first liquid channel which extends along the axial direction of the shell (20), and the first liquid channel is communicated with an inner hole of the shell (20).

3. The casing shoe according to claim 2, characterized in that at least one of the rotating blades (141) is fixed to the rotating shaft (14), the rotating blade (141) comprises a first blade (141a) and a second blade (141b), the outer diameter of the first blade (141a) matches the inner diameter of the casing (20), the outer diameter of the second blade (141b) is smaller than the inner diameter of the casing (20), and a weight plate (15) is fixed to the end of the second blade (141b) remote from the rotating shaft (14).

4. The casing shoe according to claim 3, characterized in that the weight plate (15) is an arc plate, the corresponding central angle of which is 60 ° to 180 °.

5. The casing shoe according to claim 2, characterized in that said eccentric rotating head (40) has a central through hole (40a) and said rotating sleeve (30) has a communication hole (30a) for communicating said central through hole (40a) with said first liquid passage.

6. The casing shoe according to claim 2, characterized in that the casing shoe (100) further comprises a first fixing ring (51), a first positioning sleeve (52) and a first bearing (53),

the rotating sleeve (30) comprises a first connecting shaft (31) and a sleeve (32) which are coaxially connected, and the outer diameter of the sleeve (32) is larger than that of the first connecting shaft (31);

first solid fixed ring (51) first position sleeve (52) with first bearing (53) are established from last to establishing in proper order outside first connecting axle (31), first solid fixed ring (51) with first connecting axle (31) fixed connection, first position sleeve (52) activity suit is in first connecting axle (31) is outer and fix the lower extreme of casing (20), first bearing (53) are pressed from both sides and are established first position sleeve (52) with between the terminal surface of sleeve (32).

7. The casing shoe according to claim 1, characterized in that the casing shoe (100) further comprises a second fixing ring (61), a second positioning sleeve (62) and a second bearing (63);

the eccentric rotating head (40) comprises a second connecting shaft (41) and a rotating head (42) which are coaxially connected, and the end face diameter of one end, connected with the second connecting shaft (41), of the rotating head (42) is larger than the outer diameter of the second connecting shaft (41);

the solid fixed ring of second (61), second position sleeve (62) and second bearing (63) are established from last to establishing in proper order down outside second connecting axle (41), the solid fixed ring of second (61) with second connecting axle (41) fixed connection, second position sleeve (62) activity suit is in outside second connecting axle (41) and fix the lower extreme of rotatory cover (30), second bearing (63) are pressed from both sides and are established second position sleeve (62) with between the terminal surface of rotating head (42).

8. The casing shoe according to claim 1, characterized in that said floating collar assembly (70) comprises, coaxially inside said casing (20), from top to bottom, a valve seat (71), a valve rod (72), a spring element (74) and a shunt base (73);

the valve seat (71) is fixedly connected with the shell (20), one end of the valve seat (71) is fixedly connected with the flow dividing base (73), the valve seat (71) and the flow dividing base (73) form a second liquid channel extending along the axial direction of the shell (20), and the second liquid channel is communicated with an inner hole of the shell (20);

the valve rod (72) is located in the second liquid channel, one end of the valve rod (72) is provided with a blocking portion (721), the spring piece (74) is sleeved outside the valve rod (72), the spring piece (74) is clamped between the blocking portion (721) and the shunt base (73), and the valve rod (72) is configured to block the second liquid channel under the action of the elastic force of the spring piece (74) and disconnect the communication between the second liquid channel and the inner hole of the shell (20).

9. The casing shoe according to any one of claims 1 to 8, characterized in that the casing shoe (100) further comprises a shut-in assembly (80) located within the housing (20), the shut-in assembly (80) being located above the float collar assembly (70), the shut-in assembly (80) comprising a fixed seat (81) and a sliding sleeve (82),

the fixing seat (81) is fixedly connected with the shell (20), the fixing seat (81) is of a cylindrical structure with one open end and the other closed end, the side wall of the fixing seat (81) is provided with at least one liquid circulation hole (81a), and the at least one liquid circulation hole (81a) is used for communicating the inside of the fixing seat (81) with the inner hole of the shell (20);

the sliding sleeve (82) is positioned in the fixed seat (81), the sliding sleeve (82) is configured to be operably slid from a first position to a second position, when the sliding sleeve (82) is positioned in the first position, the at least one liquid through hole (81a) is communicated with the inner hole of the shell (20) inside the fixed seat (81), and when the sliding sleeve (82) is positioned in the second position, the sliding sleeve (82) blocks the at least one liquid through hole (81a) to disconnect the communication between the inner hole of the fixed seat (81) and the inner hole of the shell (20).

10. The casing shoe according to claim 9, characterized in that the sliding sleeve (82) is a cylinder with a flange plate (821) at one end, the flange plate (821) having a diameter larger than the inner diameter of the fixed seat (81), the other end of the sliding sleeve (82) being located inside the fixed seat (81).

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