RU2823364C1 - X-mas tree protector - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas field, namely to devices for protection of production equipment against high pressures, aggressive liquids, penetration of well treatment fluids, as well as fluids during well development inside slide valves of wellhead equipment. X-mas tree protector comprises a hollow rod, upper and lower plates located one above the other, hydraulic cylinders housings connected to the upper protector plate, rods of hydraulic cylinders are connected to lower plate, in which lower housing of protector with gland packing of rod is installed, bottom of rod is equipped with sealing nozzle with cups. Protector further comprises a second protector housing, upper, fixed on the upper plate, and fixed on the protector upper plate, between the hydraulic cylinders housings, vertically oriented, connected in series mechanical gate valve and hydraulic gate valve with internal protective removable bushings, a transition coil and an adjustable head, with removable protective sleeves and flange connections. Rod is screwed into the upper housing of the protector and passes through the gland seal of the lower housing of the protector. At that, the lower housing of the protector contains the first and the second plug valves. Device is also equipped with an equalizing unit, one end is fixed on the adjustable head, and the other end is between the first and the second plug valves.

EFFECT: increasing the reliability of the device, its versatility for various standard sizes of X-mas trees and tubing used.

3 cl, 2 dwg, 1 tbl

Description

Field of technology to which the invention relates

The invention relates to the oil and gas field, namely to devices for protecting Christmas tree equipment from high pressures, aggressive liquids, penetration of well treatment fluids, as well as liquids during well development into the gate valves of the Christmas tree wellhead equipment, ingress of proppant and/or sand into the gate valves (design feature gate valves) used for processing formations in order to intensify hydrocarbon production, as well as carrying out other technological operations during major or current repairs of oil, gas, gas condensate and water intake and water injection wells.

The christmas tree protector is designed to protect wellhead equipment, which is equipped with the mouths of oil and gas condensate and water intake and water injection wells from the destructive effects of high pressure and the abrasive and corrosive effects of the pumped mixture during hydraulic fracturing operations (hydraulic fracturing) with proppant or sand, acid fracturing or hydrochloric acid processing (SKO), during the injection of process fluids into the well, as well as during the processing of liquids/fluids from the well. The christmas tree protector is used during preparatory work for hydraulic fracturing or special treatment, during the hydraulic fracturing or special treatment operation, during various technological operations with the creation of excess pressure, injection of corrosive liquids, as well as the processing of solid-phase and liquid-phase fluids from oil, gas, gas condensate and water intake and water injection wells.

State of the art

A christmas tree protector is known from the prior art (see RU 173022 U1, publ. 08/07/2017), which contains a pipe and a sleeve placed in it with the possibility of axial movement, the upper parts of which are hermetically placed in a collapsible housing consisting of a lower part and an upper part , the connecting surfaces of which are equipped with sealing elements. The upper part of the housing is equipped with holes with fixing elements and a hole for connecting the discharge line. At the upper end of the bushing, an initiating nut is installed using a threaded connection, and at the lower end of the bushing, a clamping and intermediate bushings are installed, between which sealing collars are located. The tightness of the connection between the upper part of the bushing and the lower part of the housing is ensured by sealing elements located on the inner surface of the lower part of the housing. On the inner surface of the wall of the upper part of the housing there is a thread for connecting the discharge line. On the outer surface of the lower part of the housing there is a thread for connection to the buffer flange of the Christmas tree. The upper and lower parts of the split housing can be connected, for example, using a threaded connection, and their connecting surfaces are provided with sealing elements.

However, this device can only be used if the well is killed before hydraulic fracturing (no possibility of killing) and after hydraulic fracturing (negative impact on the formation, no possibility of killing). For safety reasons, there are no shut-off valves in case of depressurization of the injection pipeline or any element of the christmas tree protector from the connection with the buffer flange to the first shut-off element of the injection line, provided that the christmas tree valves are completely isolated and there is no possibility of testing the connection between the christmas tree buffer valve and the housing, after installation of the device. The device is not suitable for performing multi-stage hydraulic fracturing with changing sealing intervals. This device does not have the ability to install and dismantle the device under pressure in the well. There is also no way to control the “set seal level” when using a wrench to activate the cuffs.

A device for protecting christmas trees is known (see RU 214536 U1, published 02.11.2022), containing a pipe and a sleeve placed in it with the possibility of axial movement, the upper part of which is hermetically installed in a hollow body, mounted on the upper end of the sleeve using a threaded connection an initiating nut, and at its lower end there is a clamping nut and an intermediate sleeve, and also in the lower part of the pipe there are sealing elements, between which the intermediate sleeve is placed. The outer surface of the upper part of the housing is provided with threads to provide a threaded connection with the discharge line, and the outer surface of the upper part of the bushing is equipped with blind grooves with which the fixing elements fixed in the housing contact, while a filter for cleaning the working fluid is installed in the upper part of the central channel of the bushing.

However, this device can only be used if the well is killed before hydraulic fracturing (no possibility of killing) and after hydraulic fracturing (negative impact on the formation, no possibility of killing). For safety reasons, there are no shut-off valves in case of depressurization of the discharge pipeline, provided that the christmas tree valves are completely isolated, and there is no possibility of testing the connection between the christmas tree buffer valve and the casing after installation of the device. The device is not suitable for performing multi-stage hydraulic fracturing with changing sealing intervals. This device does not have the ability to install and dismantle the device under pressure in the well.

A device is known for hydraulic fracturing of a gas well (see RU 54396 U1, pub. June 27, 2006), which contains a Christmas tree, a support flange for connecting to the Christmas tree, a hydraulically driven support plate consisting of a pair of hydraulic cylinders and rods with pistons. The device is equipped with a protector, including a cylindrical bushing with a sub, located in the internal cavity of the cylindrical pipe with the possibility of axial movement relative to the cylindrical pipe, a clamping bushing mounted on the outer surface of the sub, sealing collars placed on the outer surface of the cylindrical bushing with the possibility of compression when interacting with the clamping, intermediate and thrust bushings, placed respectively between the sealing collars and between the upper sealing collar and the cylindrical pipe. The device is equipped with a head placed on the outer surface of the cylindrical bushing and secured to the support flange, while the head is connected to the cylindrical pipe, and a barrel bushing with a quick-release connection, rigidly fixed to the hydraulic drive support plate, is attached to the upper end of the cylindrical bushing.

However, this device can only be used if the well is killed before hydraulic fracturing (no possibility of killing) and after (negative impact on the formation, lack of possibility of killing) hydraulic fracturing. It is necessary to use a special packer with a ball. To use the device, there is no technical possibility of screwing the stem bushing to the upper end of the cylindrical bushing. For safety reasons, there are no shut-off valves in case of depressurization of the discharge pipeline, provided that the christmas tree valves are completely isolated, and there is no possibility of testing the connection between the buffer valve and the support flange after installation of the device. The device is not suitable for performing multi-stage hydraulic fracturing with changing sealing intervals. For work safety purposes, there is no mechanical blocking of the hydraulic cylinders during hydraulic fracturing to avoid depressurization of the sealing collars, and there is no possibility of installing and dismantling the device under pressure in the well.

The closest to the claimed is the christmas tree protector (see Ibragimov I.T., Agaev O.I. Application of Christmas tree protectors when performing hydraulic fracturing / Young scientist. 02/03/2021. - No. 6 (348). - P. 122 -126. - URL: https://moluch.ru/archive/348/78300/), which consists of a hollow rod with a sealing nozzle, upper and lower plates, hydraulic cylinders, a housing and an adapter. The hollow rod of the protector passes through the chevron seal of the body and is connected with a threaded connection to the adapter, to which the hydraulic fracturing pressure lines are subsequently connected. The adapter is fixed in the upper tread plate, to which the hydraulic cylinder housings are also attached. The hydraulic cylinder rods are attached to the bottom plate, into which the tread body is mounted. The protector is equipped with an oil station for controlling hydraulic cylinders and a small diesel power station to provide power to the oil station.

However, this device is connected to the base flange through a quick-release coupling, which is not a reliable and safe solution if the well valves are deactivated, as well as installed on high-yield gas wells. The presence of a quick-release connection between the rod and the adapter is also an unsafe connection.

The absence of an equalizing unit creates a pressure difference on the sealing cuffs and can lead to destruction of the cuffs in the well when inserting and withdrawing the device into/out of the well.

Also, none of the above devices is universal, that is, they cannot be used with equal efficiency for the entire main range of tubing pipes in the oil and gas industry (standard sizes from 60.33 to 139.4 mm, with different pipe wall thicknesses).

The technical objective of the invention is to create a Christmas tree protector that allows protecting wellhead equipment from damage during technological operations in oil, gas, gas condensate, water intake and water injection wells with equal efficiency for the entire main range of tubing in the oil and gas industry (standard sizes from 60.33 up to 139.4 mm, with different pipe wall thicknesses), and carry out accident-free work on hydraulic fracturing, acid treatment and other technological operations, including the recovery of fluids from the well.

When solving a technical problem, the invention achieves a technical result consisting in increasing the reliability of the device through the use of flange connections, as well as increasing wear resistance and maintainability in the field due to the use of protective bushings, its versatility for various standard sizes of used Xmas trees and tubing due to replaceable mandrels (rods) of various sizes and lengths, increased degree and efficiency of insulation of the internal cavities of the wellhead Xmas tree, including through the introduction of internal bushings in the cavities of valves and high-pressure valves to increase the wear resistance of the Xmas tree tread elements.

Disclosure of the invention

The invention is a christmas tree protector containing a hollow rod, upper and lower plates located one above the other, hydraulic cylinder bodies attached to the upper protector plate, hydraulic cylinder rods attached to the lower plate into which the lower protector body with a rod gland seal is mounted, the bottom of the rod equipped with a sealing nozzle with cuffs, while, according to the invention, it additionally contains a second tread body, the upper one, fixed to the top plate and fixed to the top tread plate, between the bodies of the hydraulic cylinders, vertically oriented, sequentially connected to each other, mechanical gate valves and hydraulic gate valves with internal protective removable bushings, an adapter coil and an adjustable head with removable protective bushings with flange connections, while the rod is screwed into the upper protector body and passes through the gland seal of the lower protector body, and the lower protector body contains the first and second plug valves, the device is also equipped with an equalizing unit , one end fixed to the adjustable head, and the other end between the first and second plug valves.

The hydraulic gate valve is made with remote control.

The rod lowered into the Xmas tree is replaceable depending on the different standard sizes of the Xmas trees and tubing used.

Brief description of drawings

The essence of the invention can be further illustrated by a non-limiting example, reflected in the accompanying figures 1, 2, where: FIG. 1 - christmas tree protector (front view/expanded view before installation); fig. 2 - christmas tree protector (front view/view in working condition after installation at the wellhead).

The following structural elements are indicated by separate positions: 1 - bottom plate; 2 - upper body; 3 - lower body; 4 - equalizing unit; 5 - transition coil; 6 - adjustable head; 7 - hydraulic gate valve; 8 - mechanical gate valve; 9 - plug valve; 10 - second plug valve (optional); 11 - rod; 12 - cuff; 13 - nozzle assembly; 14 - top plate; 15 - hydraulic cylinder.

Carrying out the invention

The christmas tree protector contains a hollow rod 11, an upper 14 and a lower 1 plate, located one above the other, hydraulic cylinders 15, an upper protector body 2 and a lower protector body 3.

Hydraulic cylinder housings 15 are attached to the upper tread plate 14, the hydraulic cylinder rods are attached to the lower plate 1, into which the lower tread housing 3 is mounted.

The upper tread body 2 is fixed to the upper plate 14.

On the top plate 14 of the tread, between the bodies of the hydraulic cylinders, there are fixed vertically oriented, series-connected valves - a gate valve with a mechanical drive 8 with a removable inner sleeve and a gate valve with a hydraulic drive 7 with a removable inner sleeve.

The adjustable head 6 with removable internal bushings is connected to a gate valve with a hydraulic drive 8 through an adapter coil 5.

The bottom of the rod 11 is equipped with a sealing nozzle 13 with cuffs 12. The rod 11 is screwed into the upper protector body 2 and passes through the gland seal of the lower protector body 3.

The lower body of the protector 3 contains the first 9 and, optionally, the second 10 plug valves. The protector is equipped with an equalizing unit (balancing unit) 4, one end fixed to the adjustable head 6, and the other end between the first 9 and second 10 plug valves of the lower body of the protector 3. Unit 4 is designed to equalize the pressure when entering or exiting the protector into/out of the well .

The protector is equipped with an autonomous hydraulic station with a diesel drive with hydraulic cylinder control lines and a hydraulic slide valve 8.

The hydraulic gate valve 8 is made with remote control. The location of valves 7 and 8 relative to each other can vary depending on the technology for performing the work.

Gate valves 8 and 7 increase operational safety by having flanged connections. Gate valves are equipped with internal protective replaceable bushings made of wear-resistant steel alloy. These bushings can be replaced from time to time as needed and when wear occurs. As a result, the weakest wear point in the gate valve has become replaceable, and the service life of the gate valve has been significantly extended.

Remote control of valve 8 does not require the operator to be at a height, rapid response when performing technological operations, and does not require personnel to be present when manipulating equipment under pressure.

Rod 11 is inserted into the tubing (Tubing) or pipe hanger (if it is structurally intended for the work), a packer is not required.

The connections of the protector with the Christmas tree fittings, the lower casing, the upper casing with mechanical and hydraulic gate valves, the adapter coil, and the adjustable head are made with flange connections in accordance with GOST 28919-91.

The device works as follows.

Before hydraulic fracturing, the protector is lifted from the transport cradle using a truck crane.

Plates 1 and 14 are moved using hydraulic cylinders 15 to the length of the rod 11.

A rod 11 with a guide plug is screwed into the upper body of the protector 2. Bringing the plates together, pass the rod 11 through the gland seal of the lower body of the protector 3 until the rod 11 exits the lower body 3. Extensions are screwed onto the rod 11, if it is necessary to lengthen the arrangement, and a sealing nozzle 13 with cuffs 12. Plates 1 and 14 are moved apart as much as possible.

In the extended state, the protector is installed on the top of the Xmas tree (the flange of the lower body is connected using studs and nuts to the flange of the buffer valve), the protector nozzle 13 and part of the rod 11 are inserted into the cavity of the open buffer valve. With the string and root valves of the Christmas tree valves closed, the flange connection is pressurized to a pressure determined by the nature of the work and the capabilities of the equipment, but not more than the maximum operating pressure of the Christmas tree valve or the lower protector body 3.

The main and root valves of the Christmas tree valves are opened and the tread plates are brought together until they stop. Mechanical fastening of the plates is carried out by screwing and securing the nut of the upper housing 2.

After bringing the plates together, the sealing nozzle 13 with protector cuffs 12 is installed in the suspension pipe of the tubing lift or in the pipe holder, thus cutting off the Xmas tree from the pressure line. To check the reliability of isolation, a complete discharge of pressure is carried out in the cut-off small annular space of the Christmas tree (the cavity between the rod and the Christmas tree).

After checking the separation of the christmas tree and the rod with the nozzle, the equalizing unit is dismantled and the hydraulic fracturing pressure lines are connected to the adjustable head and pressure testing of the hydraulic fracturing lines is carried out with the lower hydraulic gate valve 7 of the christmas tree protector closed to the maximum operating pressure, determined by the nature of the work, but not more than the maximum operating pressure protector or hydraulic fracturing pressure line.

During the hydraulic fracturing process, the pressure in the small annulus of the Xmas tree is monitored using electronic pressure gauges, the readings of which are output to the hydraulic fracturing control station.

After hydraulic fracturing, the tread is dismantled in the reverse order.

After dismantling the protector, it is mandatory to inspect the condition of the protector nozzle, hollow rod and adapter using an ultrasonic thickness gauge and bore gauge; if wear limits are exceeded, these elements must be replaced as consumables.

The use of the proposed device, a christmas tree protector, will allow the introduction of a more rational scenario for well development using hydraulic fracturing without killing the well, without the risk of damage and depressurization of wellhead equipment, without the risk of damage to tubing during large-volume hydraulic fracturing (changing the positioning of the nozzle), reducing development time, reducing the negative impact killing fluids to the formation and achieve maximum well productivity. The flange design of the protector increases the reliability of the equipment.

Reservoir stimulation using hydraulic fracturing is one of the most popular and effective methods for increasing productivity and is performed in 90% of wells commissioned in the Russian Federation. During the hydraulic fracturing process, a large volume of a mixture of ceramic proppant (proppant) or quartz sand, water and additives (organic guar gel, etc.), as well as acid compositions during acid fracturing or acid fracturing, is pumped into the well. The volumes of injected mixtures can vary from one hundred to several thousand cubic meters, and the injection pressure can reach 105 MPa. The hydraulic fracturing mixture, the concentration of proppant in which can reach 1800 kg/m3, has a strong abrasive effect, and therefore its pumping through pressure pipelines leads to rapid wear of the internal cavities of pipeline elements and their premature failure.

Today, hydraulic fracturing / hydraulic fracturing and multi-stage hydraulic fracturing (MSHF) have become the standard method for developing newly constructed wells. If earlier, as part of EOR operations (Enhanced Oil Recovery of Reservoirs), before hydraulic fracturing, a special hydraulic fracturing lift was lowered into the well - a packer on tubing pipes, and the wellhead was equipped with special shut-off valves for the period of hydraulic fracturing, but at the moment, it is increasingly popular among subsoil users The following well construction scenario becomes:

- construction of a horizontal well equipped with a cemented or uncemented multi-stage hydraulic fracturing assembly;

- lowering the operational tubing lift (Pump and Compressor Pipes), installing operational Xmas tree equipment;

- carrying out hydraulic fracturing / special treatment (multi-hydraulic fracturing);

- immediate development of the well and its commissioning.

This scenario for the construction and development of a well makes it possible to achieve maximum well productivity, minimize the negative impact of solutions on the reservoir properties (filtration and capacitance properties) and reduce development time. It is this scenario that necessitates hydraulic fracturing through the production tubing lift and the production Christmas tree.

Typically, the maximum pressure of Christmas tree fittings is indicated in their marking and is 21, 35, 70 and less often 105 MPa. At the same time, all types of production Christmas tree fittings are not designed for pumping abrasive mixtures through them in large volumes. Such actions can lead to damage to the internal surfaces of valves, breakdown of their mechanisms, loss of tightness and even destruction of housings and the occurrence of open spills and fountains. This is especially true in winter, when hydraulic fracturing fluid and proppant entering the internal cavity of christmas tree valves - due to the design features of oil-filled valves of the ZMS type - lead to serious consequences.

Thus, based on the technical characteristics of operational Xmas trees, hydraulic fracturing through them without using a protector is not allowed.

The principle of operation of the PFA device comes down to installing a protective sleeve - a rod (mandrel) with a nozzle and cuffs, inside the Xmas tree, a suspension device (pipe holder) and a suspension pipe of the tubing lift, and the subsequent connection of the injection lines for the production of hydraulic fracturing to the adjustable head at the top parts of the protector, so that the fracturing mixture passes into the tubing lift through the Christmas tree, through the rod, without affecting the Christmas tree in any way. The impact of pressure on the valve elements is eliminated by placing at the end of the rod a sealing nozzle with sealing elements (cuffs) that seal the connection between the rod and the hanging pipe.

The claimed device has the technical characteristics shown in Table 1.

Table 1

Parameter Christmas Tree Protector Specifications Maximum operating pressure, MPa (PSI):
- high pressure lines (central trunk);
- annulus lines 105 (15000)
70 (10000) Maximum wellhead pressure for installation and dismantling*, MPa (PSI): 70 (10000) Bore diameter, mm (in.):
- annulus lines
- high pressure lines (central trunk):
Tubing pipe with outer diameter 60.33 mm.
Tubing pipe with outer diameter 73.00 mm.
Tubing pipe with outer diameter 88.90 mm.
Tubing pipe with outer diameter 114.30 mm.
Tubing pipe with outer diameter 139.70 mm 25.4 (1)
57.15 (2.25) - 69.85 (2.75)
25.40 (1.00)
36.53 (1.44)
44.45 (1.73)
57.15 (2.25)
69.85 (2.75) Tubing outer diameter / tubing wall thickness (inner diameter of the tubing, mm) 60.33 / 4.83 / 50.67 73.00 / 7.00 / 59.00
73.00 / 5.50 / 62.00 88.9 / 7.34 / 74.22 - 76.30
88.9 / 6.45 / 75.90 - 77.90 114.3 / 8.56 / 97.10 - 99.55
114.3 /7.37 / 99.56 -102.70 139.70 / 10.55 / 118.6
139.70 / 6.20 / 127.3 Barrel stroke, mm (in.) 3150 (124) Barrel movement drive Hydraulic from autonomous
hydroelectric power stations Connecting thread:
- to the high pressure line;
- to the annulus line;
- to the adapter flange for the Christmas tree fittings 5 ^3/8 '' _- 3.5-ACME
4 ^1/8 ''- ₃ -ACME
Flange 100x105 GOST 28919 Working fluids: mixtures of hydrocarbon and water based with the addition of thickeners and solid particles (proppant, sand) up to 1 mm in size, 18-20 percent acid solution (hydrochloric acid with inhibitors).** Injection speed**, m ³ /min, no more:
Tubing 60
NKT 73
NKT 89
NKT 114
Tubing 140 1.9
2.2 - 4.0
6.0
10.0
14.8 Overall dimensions, mm 4320x670x780 Weight (without spare parts and replacement equipment), kg 3000

* When inserting and removing the rod with extensions and a nozzle.

** The composition of the working fluid, the concentration and mass of the proppant injected in one technological operation is determined by the customer based on the required result and is agreed upon with the enterprise operating the protector in order to be able and safely perform the work based on practical experience and data obtained in a practical way.

So, a device has been developed to protect wellhead equipment from damage during production intensification work resulting from:

- High pressure treatment during proppant fracturing and acid fracturing / SKO (up to 15,000 psi).

- Erosion caused by the injection of large volumes of proppant with liquid, as well as during well development and removal of downhole fluid.

- For multi-stage hydraulic fracturing and acid fracturing/compression treatment with a large number of stages and fluid flow rates.

- For multi-stage hydraulic fracturing with a large amount of proppant and/or sand per stage (high-volume hydraulic fracturing - up to 450 tons per stage).

- Damage caused by the ingress of corrosive fluid into the gate valves of the Christmas tree valves (acid compositions during acid fracturing/mass treatment: acid compositions, corrosive defects of well killing fluids, water in winter, proppant-sand-water mixture).

Features of the proposed device:

Possibility of installation and dismantling in a well under pressure up to 70 MPa without killing the well.

Hydraulic cylinders are used to insert and remove the rod (including under pressure in the well), the nozzle into/out of the well, and not to activate the cuffs.

The flanged design of the protector connections increases its tightness and reliability when performing work on gas and gas-condensate wells.

Self-sealing pressure cuff activation method.

There is no need to prepare the well by killing it or lowering special equipment (packer with ball).

There is no need to use a check valve at the bottom of the nozzle.

Wide range of installation depth of the sealing nozzle. Minimum time for changing the depth of installation of the nozzle with cuffs by using different extensions.

Minimum installation and dismantling time with changing the nozzle, rod and extensions (up to 90 minutes).

The presence of internal removable protective sleeves in the gate valve and adjustable head to increase wear resistance.

The flange connection of all tread elements is more reliable compared to quick-release nut connections, which cannot be screwed during installation with control of the screwing torque with a special tool (they can be overtightened - the result is destruction, undertightened - the result is weakening or destruction of the rubber sealing ring) and during the injection process Hydraulic fracturing units are subject to strong vibration loads.

When installing the protector on the well and further introducing the hollow rod into the cavity of the Christmas tree, the Christmas tree valves are deactivated. The protector must comply with the requirements of GOST 51365-2009 in the area of section 4.8 “Requirements for the design of shut-off valves”, subclause 4.8.4 “Connecting dimensions of flanges of valves and taps - in accordance with GOST 28919-91”.

Thus, by eliminating unreliable quick-release connections from the device and replacing them with flange connections and including an equalizing unit in the design, the presence of differential pressure on the sealing collars when inserting and removing the rod into/out of the well is eliminated, thereby increasing the reliability of the inventive device.

The description of the invention makes it possible to create a Christmas tree protector that allows protecting wellhead equipment from damage during technological operations in oil, gas, gas condensate, water intake and water injection wells with equal efficiency for the entire main range of tubing in the oil and gas industry (standard sizes from 60.33 up to 139.4 mm, with different pipe wall thicknesses), and carry out accident-free work on hydraulic fracturing, acid treatment and other technological operations, including the recovery of fluids from the well.

When implementing the invention, an increase in the reliability of the christmas tree protector is achieved, its versatility for various standard sizes of the used christmas trees and tubing due to replaceable mandrels (rods) of various sizes and lengths, an increased degree and efficiency of insulation of the internal cavities of the wellhead christmas tree, including due to introduction of internal bushings in the cavities of valves and high-pressure valves to increase the wear resistance of the christmas tree tread elements.

A search through publicly available sources of information showed that the entire set of features of the proposed invention is not known from the prior art and does not clearly follow, and therefore the invention meets the conditions of patentability “novelty” and “inventive step”.

The claimed invention consists of elements and materials standard for this field of technology, that is, it can be used in industry, which is why the invention meets the patentability condition of “industrial applicability”.

It should be understood that after review by a specialist of the given description with an example of implementation of the proposed invention, other changes, modifications and embodiments of the invention will become obvious to him. Thus, all such changes, modifications and variations, as well as other applications that do not deviate from the spirit of the present invention, should be considered protected by the present invention within the scope of the appended claims.

Claims (3)

1. A christmas tree protector containing a hollow rod, upper and lower plates located one above the other, hydraulic cylinder bodies attached to the upper protector plate, hydraulic cylinder rods attached to the lower plate into which the lower protector body with a rod gland seal is mounted, the bottom of the rod is equipped with a sealing nozzle with cuffs, characterized in that it additionally contains a second tread body, the upper one, fixed on the top plate, and fixed on the top tread plate, between the bodies of the hydraulic cylinders, vertically oriented, sequentially interconnected slide mechanical and slide hydraulic valves with internal protective removable bushings, an adapter coil and an adjustable head, with removable protective bushings, and flange connections, while the rod is screwed into the upper protector body and passes through the gland seal of the lower protector body, and the lower protector body contains the first and second plug valves, the device is also equipped with an equalizing unit , one end fixed to the adjustable head, and the other end between the first and second plug valves. 2. The christmas tree protector according to claim 1, characterized in that the hydraulic gate valve is remote controlled. 3. Christmas tree protector according to any one of paragraphs. 1 or 2, characterized in that the rod lowered into the Xmas tree is replaceable depending on the different standard sizes of the Xmas trees and tubing pipes used.