CN212105832U

CN212105832U - Underground switch valve capable of being disconnected or connected back

Info

Publication number: CN212105832U
Application number: CN201922032372.3U
Authority: CN
Inventors: 王艳荣; 郭钢; 陈娟
Original assignee: Baoji Yuanheng Oilfield Equipment Co ltd
Current assignee: Baoji Yuanheng Oilfield Equipment Co ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-12-08
Anticipated expiration: 2029-11-13

Abstract

The present disclosure relates to a downhole switching valve that can be disengaged or tied back, comprising: a valve body having an open position and a closed position enabling the downhole switching valve to be in a closed state or a communication state, respectively; the release tool is detachably connected to the valve body and can complete release action and enable the valve body to be in a closed position; and a tie-back tool insertably mounted to the valve body, capable of performing a tie-back action and causing the valve body to be in an open position. Therefore, according to the embodiment of the disclosure, the blocking and isolation of oil-gas flow and well fluid can be ensured when the operation of replacing an operation pipe column, temporarily abandoning a well, repairing the well and the like is performed, the operation process is optimized, the loss of well killing fluid is prevented, and the well control risk caused by the fact that the oil-gas flow enters a shaft is reduced.

Description

Underground switch valve capable of being disconnected or connected back

Technical Field

The disclosure relates to the field of petroleum and natural gas testing, production and maintenance operation equipment, in particular to an underground switch valve capable of being disconnected or connected in a tie-back mode.

Background

The downhole switch valve is used in the test, production and maintenance of petroleum and gas well and as the downhole blowout preventer to open and close the well in the upper part of the packer to realize bidirectional isolation. The related underground switch valve has the problems of single operation mode, unreliable sealing in the environment with lower working temperature and insufficient operation safety.

Particularly, traditional switching valve in pit mainly uses nonmetal sealed (perfluoroether or fluororubber O shape circle + lock ring), and the perfluoroether material is expensive, and the purchase cycle is long, and low temperature sealing performance is poor, and the operation instrument can't carry out the high pressure difference test on ground, and fluororubber is not high temperature resistant environment, and the part of this instrument is more in addition, and the quantity of seal part is also more between the part, therefore greatly increased instrument is gone into the well and is used the leakage risk, causes the consequence of many operation failures.

And the similar tools in the market can not decompose the well opening and closing actions and the releasing and tieback actions, can not test the sealing and isolating effect of the closed well before releasing the hands, and can not test the sealing and isolating effect of the oil sleeve before opening the well after tieback. Therefore, the upper pipe column can be separated under the condition that the well is closed (the ball valve is closed) and cannot be sealed, and the danger of well kick caused by the fact that the pipe column is separated due to the failure of well closing cannot be avoided; and the well can be opened under the condition that the oil jacket isolation is not sealed after the tie-back, so that the danger of oil jacket communication caused by the failure of oil jacket isolation cannot be avoided. In addition, the current market of similar tools is mainly based on mechanical operation. Such problems are associated with, for example, the patent application 2018204287926, a mechanically operated, release and tie-back downhole on-off valve.

In actual operation, mechanical operation cannot be performed due to the influence of factors such as well conditions, wellhead devices, operation processes and the like. And the operation mode is also required to be temporarily changed due to the change of the actual condition, so that the existing products in the market cannot be adjusted in time, the operation is suspended and waited, and the operation cost and the well control risk are increased. In addition, most of the products need to be rotated and buckled for the back connection action, and the operation difficulty is high and the products are easy to lose. And the plug-in structure is available, but the operation success probability is low due to the structural defects.

Along with the development requirements of crude oil and natural gas development, the requirements on the bearing capacity and the working temperature of the tool are higher and higher, and the working pressure difference of the high-temperature and high-pressure resistant tool available in the O-shaped ring at present is 10000 Psi; the sealing mainly uses nonmetal sealing (perfluoroether O-shaped ring and support ring), the temperature resistance is up to 230 ℃, but the material is expensive, the purchase period is long, the low-temperature sealing performance is poor, the operation tool cannot perform a high pressure difference test on the ground, in addition, the number of parts of the tool is large, and the number of sealing parts among the parts is also large, so the leakage risk of the tool used in the well is greatly increased, and the result of many operation failures is caused.

At present, the tools have more parts and more sealing parts among the parts, so when the tools are used as a completion string after being connected back, the sealing materials are greatly influenced by temperature, pressure and working life, and the working life generally needs more than two years. The perfluoroether O-ring + backing ring seal does not meet this requirement.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present disclosure provides an underground well switching valve, which is used to ensure that oil gas flow and well fluid are blocked and isolated when operations such as replacing an operation pipe column, temporarily abandoning a well, repairing a well, etc., optimize an operation process, prevent loss of killing fluid, and reduce well control risk caused by oil gas flow entering a wellbore.

In one aspect of the present disclosure, there is provided a downhole switching valve that can be disengaged or reconnected, comprising:

a valve body having an open position and a closed position enabling the downhole switching valve to be in a closed state or a communication state, respectively;

the release tool is detachably connected to the valve body and can complete release action and enable the valve body to be in a closed position; and

a tie-back tool insertably mounted to the valve body, capable of performing a tie-back action and causing the valve body to be in an open position;

wherein the release tool and the tie-back tool are further actuatable by gas or liquid pressure to respectively place the valve body in a closed and an open position.

In some embodiments, the valve body comprises:

the tieback outer barrel is provided with a first inner hole structure;

the ball valve mechanism is detachably arranged at the lower end of the first inner hole structure through threads and can selectively enable the first inner hole structure to be in a closed state or a communicated state; and

and the first limiting sleeve is arranged in the first inner hole structure of the tie-back outer barrel through threads and is positioned on the upper side of the ball valve mechanism.

In some embodiments, the ball valve mechanism comprises:

the lower end of the lower seat ring is detachably connected with the internal thread at the lower end of the tieback outer barrel through external threads, and the lower seat ring is provided with a second inner hole structure communicated with the first inner hole structure;

the ball cage is embedded between the upper end of the lower seat ring and the tieback outer barrel, a cavity structure is formed between the interior of the ball cage and the lower seat ring, and the cavity structure is communicated with the second inner hole structure;

the ball valve assembly is rotatably embedded in the cavity structure, is internally provided with a third inner hole structure, and can enable the third inner hole structure and the second inner hole structure to be in a closed state or a communicated state respectively through self rotation; and

and the ball valve driving device is connected with the ball valve assembly and is used for driving the ball valve assembly to rotate.

In some embodiments, the ball valve assembly has two radial apertures defined therein, and the ball valve driving device includes:

the two operating pins are slidably arranged on the outer side of the upper end of the ball cage, radial spherical lugs are arranged on the inner side surface of the operating pins, the radial spherical lugs penetrate through the radial small holes to drive the ball valve assembly to rotate, and a first annular groove is formed in the upper end of the inner side of each operating pin;

the elastic claw is arranged in the first inner hole structure of the tieback outer cylinder, the upper end of the elastic claw is provided with a circular claw-shaped structure, and the outer side of the lower end of the elastic claw is provided with a second annular groove, so that the elastic claw is connected with the operating pin by forming embedded connection with the first annular groove.

In some embodiments, the release tool comprises:

the lower end of the pull-out short section is rotatably connected with the internal thread at the upper end of the first inner hole structure of the tie-back outer cylinder through external threads, and a fourth inner hole structure communicated with the first inner hole structure is arranged inside the pull-out short section;

the lower end of the first rupture disc outer cylinder is rotatably connected with the external thread at the upper end of the pull-out short section through external threads, and a fifth inner hole structure communicated with the fourth inner hole structure is arranged in the first rupture disc outer cylinder;

the first mandrel is slidably arranged in a fifth inner hole structure of the first rupture disc outer cylinder, the lower end of the first mandrel is clamped with the claw-shaped structure of the elastic claw, and a first air channel is formed between the first mandrel and the first rupture disc outer cylinder; and

and the first rupture disc is arranged between the first rupture disc outer cylinder and the first mandrel in a sealing mode and can selectively enable gas or liquid to enter the first air passage.

In some embodiments, the release tool comprises:

the first shear pin is arranged between a radial hole at the upper end of the pull-out short section and the annular groove on the outer side of the first mandrel and used for limiting the relative position of the pull-out short section and the first mandrel along the vertical direction;

first of allA damper pad provided in a first slidable gap between the first rupture disc outer cylinder and the first mandrel;

wherein the first slidable gap and the first air passage are sealed by a seal ring.

In some embodiments, the first rupture disk is threadably secured to a shoulder at the upper end of the fifth bore structure of the first rupture disk outer cartridge and is adapted to be self-ruptured by internal pressure within the fifth bore structure, thereby allowing gas or liquid pressure to enter the first gas path and urge the first mandrel to slide upwardly within the fifth bore structure of the first rupture disk outer cartridge.

In some embodiments, the first rupture disk is threadably secured to the outer cylinder excircle of the first rupture disk, and is self-breakable by external pressure from the outer cylinder of the first rupture disk, thereby allowing gas or liquid to enter the first air passage and pushing the first mandrel to slide upward within the fifth inner bore structure of the outer cylinder of the first rupture disk.

In some embodiments, the tie-back tool comprises:

the lower end of the air chamber outer cylinder is connected to the first inner hole structure of the tieback outer cylinder in an inserting mode and is provided with a sixth inner hole structure communicated with the first inner hole structure;

the second mandrel penetrates into the sixth inner hole structure of the air chamber outer cylinder from the upper end, and a second air channel is formed between the second mandrel and the air chamber outer cylinder;

the second rupture disc is arranged between the air chamber outer cylinder and the second mandrel in a sealing mode and can selectively enable gas or liquid to enter the second air path; and

and the anchoring claw is arranged at the shoulder position in the middle of the excircle of the air chamber outer cylinder in a penetrating manner from the lower end of the air chamber outer cylinder.

In some embodiments, the tie-back tool comprises:

the second limiting sleeve is detachably connected with the lower end of the air chamber outer cylinder through threads and is positioned at the lower end of the anchoring claw;

the three closing components penetrate through the outer circumferential surface at the lower end of the air chamber outer cylinder and are positioned on the lower side of the second limiting sleeve; and

and the guide joint is detachably connected to the lower end of the air chamber outer cylinder through threads and is positioned at the lower sides of the three closing components.

In some embodiments, the tie-back tool comprises:

the shearing pin sleeve is arranged in an annular cavity between the air chamber outer cylinder and the second mandrel, is used for fixing the relative position of the second mandrel and the air chamber outer cylinder, and is provided with a radial hole;

the second shear pin is fixed on the outer peripheral surface of the second mandrel through a radial hole in the shear pin sleeve;

second oneA damper pad provided in a second slidable gap between the air chamber outer cylinder and the second spindle;

wherein the second slidable gap and the second air passage are sealed from each other.

In some embodiments, the tie-back tool comprises:

the sealing sleeve is arranged in an annular cavity between the air chamber outer cylinder and the second mandrel, is positioned outside the shear pin sleeve, and is provided with an outer circular shoulder at the upper end, and can be clamped with an inner hole shoulder of the air chamber outer cylinder so as to limit the downward movement of the sealing sleeve;

the check ring is in threaded connection with the first inner hole structure of the air chamber outer cylinder and is arranged at the upper end of the sealing sleeve so as to limit the upward movement of the sealing sleeve; and

and the locking ring is arranged in an annular groove at the upper end of the second mandrel, is positioned at the upper end of the second shear pin and is used for locking the position of the second mandrel so as to keep the opening state of the ball valve.

In some embodiments, the second rupture disc is threadably secured within the sealing sleeve bore and is adapted to be self-ruptured by the internal pressure of the sealing sleeve, thereby allowing gas or liquid pressure to enter the second gas path and force the second mandrel to slide distally within the sixth bore structure of the air chamber outer barrel.

In some embodiments, the second rupture disc is fixed on the outer circle of the air chamber outer cylinder through threads, and can be driven by the internal pressure of the sealing sleeve to break itself, so that gas or liquid pressure enters the second air path and pushes the second mandrel to slide in the sixth inner hole structure of the air chamber outer cylinder towards the lower end.

Therefore, according to the embodiment of the disclosure, the blocking and isolation of oil-gas flow and well fluid can be ensured when the operation of replacing an operation pipe column, temporarily abandoning a well, repairing the well and the like is performed, the operation process is optimized, the loss of well killing fluid is prevented, and the well control risk caused by the fact that the oil-gas flow enters a shaft is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a valve body according to some embodiments of the present disclosure;

FIG. 2 is a schematic illustration of a partial (including operator pin) construction of a ball valve mechanism according to some embodiments of the present disclosure;

FIG. 3 is a schematic illustration of a partial (without an operating pin) construction of a ball valve portion according to some embodiments of the present disclosure;

FIG. 4 is a schematic structural view of an operating pin according to some embodiments of the present disclosure;

FIG. 5 is a schematic structural view of an in-line pressure operated release tool according to some embodiments of the present disclosure;

FIG. 6 is a schematic illustration of a portion of a first rupture disc of a pressure operated release tool within a pipe in accordance with some embodiments of the present disclosure;

FIG. 7 is a schematic illustration of a partial structure of a pressure operated inside pipe shear pin of a release tool according to some embodiments of the present disclosure;

FIG. 8 is a schematic structural view of an annulus pressure operated release tool according to some embodiments of the present disclosure;

FIG. 9 is a schematic structural view of a first rupture disc of an annulus pressure operated tie-back tool according to some embodiments of the present disclosure;

FIG. 10 is a schematic structural view of an in-line pressure operated release tool according to some embodiments of the present disclosure;

FIG. 11 is a schematic structural view of a second rupture disc of a pressure operated release tool within a tube according to some embodiments of the present disclosure;

FIG. 12 is a schematic structural view of an annulus pressure operated tie-back tool according to some embodiments of the present disclosure;

FIG. 13 is a schematic structural view of a second rupture disc of an annulus pressure operated release tool according to some embodiments of the present disclosure;

FIG. 14 is a schematic structural view of a pressure operated hands-free state within a tube according to some embodiments of the present disclosure;

FIG. 15 is a schematic structural view of an annulus pressure operated pre-hands-off condition according to some embodiments of the present disclosure;

FIG. 16 is a schematic structural view of a post-internal pressure operated tieback condition according to some embodiments of the present disclosure;

FIG. 17 is a schematic structural view of a post annulus pressure operational tie-back condition according to some embodiments of the present disclosure;

it should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

As shown in fig. 1 to 17, for convenience of description, the present application describes a positional relationship between an upper position and a lower position of the on-off valve in the well, where the upper position corresponds to the left side in the drawing and the lower position corresponds to the right side in the drawing.

A disconnectable or tieback downhole on-off valve comprising:

In some embodiments, the valve body comprises:

a tieback outer barrel 14 having a first bore configuration;

and the first limiting sleeve 15 is installed in the first inner hole structure of the tieback outer cylinder 14 through threads and is positioned on the upper side of the ball valve mechanism.

In some embodiments, the ball valve mechanism comprises:

a lower race 20 having a second inner hole structure communicated with the first inner hole structure, the lower end of which is detachably connected to the inner thread of the lower end of the tie-back outer cylinder 14 through an outer thread;

the ball cage 18 is embedded between the upper end of the lower seat ring 20 and the tieback outer barrel 14, a cavity structure is formed between the interior of the ball cage and the lower seat ring 20, and the cavity structure is communicated with the second inner hole structure;

the ball valve assembly 19 is rotatably embedded in the cavity structure, is internally provided with a third inner hole structure, and can enable the third inner hole structure to be in a closed state or a communicated state with the second inner hole structure through self rotation; and

and the ball valve driving device is connected with the ball valve assembly 19 and is used for driving the ball valve assembly 19 to rotate.

In some embodiments, the ball valve assembly 19 defines two radial apertures 30 and the ball valve actuator comprises:

the two operating pins 17 are slidably mounted on the outer side of the upper end of the ball cage 18, the inner side surface of each operating pin is provided with a radial spherical lug 27, the radial spherical lugs 27 are arranged between the radial small holes 30 in a penetrating manner so as to drive the ball valve assembly 19 to rotate, and the inner upper end of each operating pin 17 is provided with a first annular groove 28;

and the elastic claw 16 is arranged in the first inner hole structure of the tieback outer cylinder 14, the upper end of the elastic claw is provided with a circular claw-shaped structure, the outer side of the lower end of the elastic claw is provided with a second annular groove 29, and therefore the elastic claw 16 is connected with the operating pin by forming embedded connection with the first annular groove.

In some embodiments, the release tool comprises:

the lower end of the pull-out short section 26 is rotatably connected with the internal thread at the upper end of the first inner hole structure of the tieback outer cylinder 14 through external threads, and a fourth inner hole structure communicated with the first inner hole structure is arranged inside the pull-out short section;

the lower end of the first rupture disc outer cylinder 21 is rotatably connected with the external thread at the upper end of the pull-out short section 26 through external threads, and a fifth inner hole structure communicated with the fourth inner hole structure is arranged in the first rupture disc outer cylinder;

the first mandrel 22 is slidably arranged in the fifth inner hole structure of the first rupture disc outer cylinder 21, the lower end of the first mandrel 22 is clamped with the claw-shaped structure of the elastic claw 16, and a first air passage is formed between the first mandrel 22 and the first rupture disc outer cylinder 21; and

and a first rupture disc 24 sealing a first air passage provided between the first rupture disc outer cylinder 21 and the first mandrel 22, and selectively allowing gas or liquid pressure to enter the first air passage.

In some embodiments, the release tool comprises:

the first shear pin 25 is arranged between a radial hole 30 at the upper end of the pull-out short section 26 and an annular groove 31 on the outer side of the first mandrel 22 and is used for limiting the relative position of the pull-out short section 26 and the first mandrel 22 along the vertical direction;

first of all A damper pad 23 provided in a first slidable gap between the first rupture disc outer cylinder 21 and the first mandrel 22;

In some embodiments, the first rupture disk 24 is threadably secured to a shoulder at the upper end of the fifth internal bore structure of the first rupture disk outer cylinder 21 and is adapted to be self-ruptured by the internal pressure of the fifth internal bore structure, thereby allowing gas or liquid pressure to enter the first gas path and push the first mandrel 22 to slide upwardly within the fifth internal bore structure of the first rupture disk outer cylinder 21.

In some embodiments, the first rupture disk is fixed on the excircle of the first rupture disk outer cylinder 21 by screw threads, and can be driven by the external pressure of the first rupture disk outer cylinder 21 to break itself, so that gas or liquid pressure enters the first air passage and pushes the first mandrel 22 to slide upwards in the fifth inner hole structure of the first rupture disk outer cylinder 21.

In some embodiments, the tie-back tool comprises:

the lower end of the air chamber outer cylinder 2 is connected to the first inner hole structure of the tieback outer cylinder 14 in an inserting mode and is provided with a sixth inner hole structure communicated with the first inner hole structure;

the second mandrel 5 penetrates into the sixth inner hole structure of the air chamber outer cylinder 2 from the upper end, and a second air channel is formed between the second mandrel and the air chamber outer cylinder 2;

a second rupture disc 3 which is hermetically provided in a second air passage between the air chamber outer cylinder 2 and the second mandrel 5 and which can selectively allow gas or liquid pressure to enter the second air passage; and

and the anchoring claw 10 is arranged at the position of a shoulder 33 in the middle of the excircle of the air chamber outer cylinder 2 in a penetrating way from the lower end of the air chamber outer cylinder 2.

In some embodiments, the tie-back tool comprises:

the second stop collar 11 is detachably connected with the lower end of the air chamber outer cylinder 2 through threads and is positioned at the lower end of the anchoring claw 10;

the three closing components 12 penetrate through the outer circumferential surface of the lower end of the air chamber outer cylinder 2 and are positioned on the lower side of the second limiting sleeve 11; and

and a guide joint 13 detachably connected to the lower end of the air chamber outer cylinder 2 through threads and positioned at the lower side of the three closing components 12.

In some embodiments, the tie-back tool comprises:

the shearing pin sleeve 8 is arranged in an annular cavity between the air chamber outer cylinder 2 and the second mandrel 5, is used for fixing the relative position of the second mandrel 5 and the air chamber outer cylinder 2, and is provided with a radial hole;

the second shear pin 7 is fixed on the outer peripheral surface of the second mandrel 5 through a radial hole on the shear pin sleeve 8;

second oneA damper pad 9 provided in a second slidable gap between the air chamber outer cylinder 2 and the second spindle 5;

In some embodiments, the tie-back tool comprises:

the sealing sleeve 4 is arranged in an annular cavity between the air chamber outer cylinder 2 and the second mandrel 5, is positioned outside the shear pin sleeve 8, has an outer circular shoulder 32 at the upper end, and can be clamped with an inner hole shoulder of the air chamber outer cylinder 2 so as to limit the downward movement of the sealing sleeve 4;

the check ring 1 is in threaded connection with the first inner hole structure of the air chamber outer cylinder 2 and is arranged at the upper end of the sealing sleeve 4 so as to limit the upward movement of the sealing sleeve 4; and

and the locking ring 6 is arranged in an annular groove at the upper end of the second mandrel 5, is positioned at the upper end of the second shear pin 7, and is used for locking the position of the second mandrel 5 so as to keep the opening state of the ball valve.

In some embodiments, the second rupture disc 3 is screwed into the inner hole of the sealing sleeve 4, and can be driven by the internal pressure of the sealing sleeve 4 to break itself, so that the gas or liquid pressure enters the second air passage and pushes the second mandrel 5 to slide in the sixth inner hole structure of the air chamber outer cylinder 2 to the lower end.

In some embodiments, the second rupture disc 3 is fixed on the outer circle of the air chamber outer cylinder 2 by screw thread, and can be driven by the internal pressure of the sealing sleeve 4 to break itself, so that the gas or liquid pressure enters the second air path and pushes the second mandrel 5 to slide in the sixth inner hole structure of the air chamber outer cylinder 2 to the lower end.

The present application is further described below with reference to the accompanying drawings:

a valve body: referring to fig. 1 in detail, the ball valve assembly 19 is installed in the ball cage 18, and the ball valve assembly 19, the ball cage 18 and the lower seat ring 20 are connected into a whole through the lower end screw thread of the ball cage 18 and the left end screw thread of the lower seat ring 20. Two operating pins 17 are mounted outside the cage, each operating pin 17 has a radial spherical lug 27 on its inner side, which is inserted into two radial small holes 30 of the ball valve assembly 9, and an annular groove 29 on the outer circle of the lower end of the elastic claw 16 is embedded with an annular groove 28 on the inner hole of the operating pin 17, which together constitute the ball valve mechanism, as shown in fig. 2, 3 and 4. The ball valve mechanism is fixed on the thread of the inner hole at the lower end of the tieback outer cylinder 14 by the thread at the lower end of the lower seat ring 20. The first stop collar 15 is fixed in the inner hole of the middle section of the tieback outer cylinder 14 through threads.

A tool for releasing hands: the device is divided into two types of pressure operation in a pipe and annular pressure operation, and the structure difference is that the mounting positions of rupture discs are different. The pressure operation inside the tube is detailed in figure 5; the annular pressure operation is detailed in figure 8.

The right port of the outer barrel 21 of the rupture disc is connected with a stripping short joint 25 in a threaded manner, and the relative position of the first shear pin 25 is fixed through a radial hole 30 at the left end of the stripping short joint 26 and an annular groove 31 on the outer circle of the first mandrel 22, which is shown in detail in fig. 6. A pressure operated inside tube disengaging section rupture disc 24 is threadably secured to the left end inner bore shoulder of rupture disc outer cylinder 21 as seen in detail in fig. 7. An annulus pressure operated release section rupture disc 24 is threadably secured to the outer periphery of the rupture disc outer cylinder 21 as shown in fig. 9.

A tie-back part:

the method is divided into two types of pressure operation in a pipe and annular pressure operation, and the difference is that the mounting positions of rupture discs are different. The operation of the pressure in the tube is shown in detail in fig. 10 and 11; the annular pressure operation is shown in detail in figures 12 and 13.

The second shear pin 7 is fixed on the excircle of the second mandrel 5 through a radial hole on a shear pin sleeve 8,second oneThe damper pad 9 is mounted on the first mandrel 22 in the illustrated position, the second mandrel 5 is inserted into the inner hole of the air chamber breaking outer cylinder 2 from the left end, and the relative position of the first mandrel 22 and the air chamber outer cylinder 2 is fixed by the shear pin sleeve 8. The outer circular shoulder 32 at the left end of the sealing sleeve 4 is fixed at the inner hole shoulder position of the air chamber outer cylinder 2 through the retainer ring 1. The retainer ring 1 is connected with the inner hole of the air chamber outer cylinder 2 through screw threads to block the sealing sleeve 4. The anchoring claw 10 penetrates through the spline from the right end of the air chamber outer cylinder 2 and is arranged at the position of an excircle shoulder 33 in the middle of the air chamber outer cylinder 2 in an empty mode, the second limiting sleeve 11 is connected with the air chamber outer cylinder 2 through threads, and the three sealing components 12 penetrate through the excircle at the right end of the air chamber outer cylinder 2 and are arranged on the right side of the second limiting sleeve 11And a guide joint 13 is connected to the right end of the air chamber outer cylinder 2 through threads to fix the position of the sealing component 12. The pressure operated release tool rupture disc 3 in the tube is secured by threading into the internal bore of gland 4 as shown in fig. 11. An annulus pressure operated release tool rupture disc 3 is threadably secured to the outer circle of the air chamber outer barrel 2 as shown in fig. 13.

Thus, according to fig. 14 to 17:

when pressure operation is carried out, the well is closed, and the working principle of releasing the hand is as follows:

the well shut-in operation is carried out, the annular space or the inside of the oil pipe is pressurized, the rupture disk 24 on the rupture disk outer cylinder 21 is broken, and the pressure pushes the first mandrel 22 to move upwards until the first mandrel 22 is pushed to move upwardsFirst of all The shock pad 23 is squeezed by the first mandrel 22 and the outer barrel 21 of the rupture disc, and in the process, the annular groove on the outer circle of the lower part of the first mandrel 22 drives the elastic claw 16 upwards to drive the operating pin 17 to rotate the ball body of the ball closing valve assembly 19 for 90 degrees, and the ball closing valve is closed to realize the two-way sealing of the well closing.

And (3) a releasing operation is carried out, the pipe column is rotated to release the threads between the releasing nipple 26 and the tieback outer cylinder 14, and the elastic claw 16 is dragged to the right end face of the first stop collar 15 to stop and open in the well closing process. And lifting the pipe column, and disengaging the short joint 26 and the first mandrel 22 from the tieback outer barrel 14. So far, the hand-off action is finished.

Before the well closing operation is not carried out, if the well closing and the hands-off actions are temporarily needed to be carried out simultaneously, the hands-off operation can be directly carried out, and the ball valve can also close the well during the operation.

When pressure operation is carried out, the working principle of tie-back and well opening is as follows:

the tie-back operation is plug-in, when tie-back is carried out, the front end of the second mandrel 5 enters the tie-back outer cylinder 14, then the sealing component 12 enters the tie-back outer cylinder 14, the anchoring claws 10 shrink into the tie-back outer cylinder 14 until the anchoring claws 10 are expanded and the tie-back part is inserted into the limiting point of the inner conical surface of the tie-back outer cylinder 14. In the process, the locking ring 6 is contracted in an annular groove at the right side of the sealing groove at the upper end of the second mandrel 5, and the position of the second mandrel 5 is locked, so that the opening state of the ball valve is kept. At which point the tieback action is complete.

Pressurizing the pipe column or the annular space to break the sealing sleeve 4 or the air chamber outer cylinder during well opening operation2, the rupture disc 3 allows pressure to move the second mandrel 5 downwards untilSecond oneThe damper pad 9 is pressed by the second mandrel 5 and the air chamber outer cylinder 2. Meanwhile, the conical surface at the front end of the second mandrel 5 pushes the inner conical surface of the elastic claw hole and then pushes the elastic claw 16 to drive the operating pin 17 downwards to rotate the ball body of the ball valve assembly 19 by 90 degrees, and the ball valve is opened to open the well.

The connection between the tie-back part and the valve body is relatively fixed by the engagement of the external circle sawtooth thread at the right end of the anchoring claw 10 and the tie-back outer cylinder 14. When the tension force is generated in the pipe column after the tie-back, the air chamber outer cylinder 2 is lifted up, so that the left conical surface of the second limiting sleeve 11 is tightly squeezed with the inner conical surface of the orifice at the right end of the anchoring claw 10, and the reliable connection of the tie-back part and the tie-back outer cylinder 14 is achieved.

When mechanical operation is carried out, the well is closed, and the working principle of releasing the hand is as follows:

before the well is lowered, the mounting hole of the sealing sleeve 4 or the rupture disk 3 on the air chamber outer cylinder 2 is sealed. When the well is closed and the hand is released, the rotary pipe column rotates the thread between the pull-out nipple 26 and the tieback outer cylinder 14 out of half of the screwing length. In the process, the annular groove on the excircle of the lower part of the second mandrel 5 drives the elastic claw 16 upwards to drive the operating pin 17 to rotate the ball body of the ball valve closing assembly 19 for 90 degrees, and the ball valve is closed to realize the two-way sealing of the well closing. At the moment, the sealing component 12 is not separated from the sealing surface of the tie-back outer cylinder 14, the sealing performance of the ball valve can be tested by pressurizing in the upper pipe of the ball valve, and when the sealing is qualified, the pipe column can be continuously rotated, the pipe column can be lifted up to be taken off after the threads between the pipe column separation nipple 26 and the tie-back outer cylinder 14 are completely separated. When the sealing effect of the ball valve after the well is shut down is not required to be tested, the threads between the pull-out nipple 26 and the tie-back outer cylinder 14 can be rotated all at one time to be disconnected from the lifting pipe column and the pull-out handle.

When mechanical operation is carried out, the working principle of tieback and well opening is as follows:

before the well is used, the sealing sleeve 4 or the rupture disc 3 on the air chamber outer cylinder 2 is not installed, and the second shear pin 7 is not installed. At the same time, the second spindle 5 is mounted at the rightmost end position relative to the air chamber outer cylinder 2, and the second spindle 5 and the air chamber outer cylinder 2 are clamped tightlySecond oneA shock absorbing pad 9. The locking ring 6 is locked in the annular groove at the right side of the upper end sealing groove of the second mandrel 5. When the well needs to be reconnected and opened, the second mandrel 5 is in front ofThe end enters the tieback outer cylinder 14, then the sealing component 12 enters the tieback outer cylinder 14, then the ball of the ball valve assembly 19 rotates 90 degrees to open the well, and simultaneously the anchoring claws 10 shrink into the tieback outer cylinder 14 until the anchoring claws 10 expand and the tieback part is inserted into the limiting points of the inner conical surface of the tieback outer cylinder 14, and then the tieback and well opening actions are completed.

Therefore, the technical effects brought by the technical scheme provided by the embodiment of the application comprise that:

provides a plurality of operation modes, and obviously improves the convenience and the reliability of the plug-in tieback.

The product of this patent provides machinery, two kinds of operating modes of pressure. Wherein the pressure operation can be selected from annular pressure operation and pressure operation in the pipe. The mechanical operation mode is also reserved. All can be selected according to the needs.

The tie-back adopts plug-in operation, and this plug-in structure adopts sawtooth screw thread elasticity to indicate the structure, makes the tie-back process insert along the great one side of sawtooth angle, and it is convenient to insert, and the opposite side small-angle that the sawtooth was detained is difficult for breaking away when the tubular column produced the tensile force, and the anchoring claw is also extruded outwards when being crowded upwards, makes the connection after the tie-back more firm.

The operation safety is improved:

1) before the hand is taken off, the well is closed (the ball valve is closed), the sealing effect of the well closing is tested, the danger caused by the fact that the well closing fails and the pipe column is disengaged is avoided, and the operation safety is guaranteed;

2) and the well is opened (the ball valve is opened) after the tie-back, the sealing effect of the oil sleeve isolation after the tie-back can be verified before the well is opened, the danger of the oil sleeve communication caused by the simultaneous well opening is avoided, and the safety of the tie-back operation is ensured.

The working pressure is increased:

1) by adopting an integral thick-wall structure, the absolute pressure difference resistance is more than or equal to 220MPa, and the relative pressure difference resistance is more than or equal to 105 MPa;

2) the ball valve keeps the structure, and the bidirectional working pressure difference of the ball valve is improved by more than or equal to 105 MPa.

Improvement of sealing reliability and working temperature:

1) the integral structure is adopted, so that the rubber O-shaped ring is prevented from being used for the sealing part isolated by the oil sleeve;

2) after the well is opened, the internal and external sealing positions of the pipe column are only 1, the underground continuous working time is more than or equal to 3 years, and the working temperature is more than or equal to 230 ℃.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A downhole switching valve capable of being disconnected or reconnected, comprising:

wherein the releasing tool and the tieback tool can be further driven by gas or liquid pressure to respectively complete the releasing action and the tieback action.

2. The downhole switch valve of claim 1, wherein the valve body comprises:

a tieback outer barrel (14) having a first bore configuration;

and the first limiting sleeve (15) is installed in the first inner hole structure of the tie-back outer cylinder (14) through threads and is positioned on the upper side of the ball valve mechanism.

3. The downhole switch valve of claim 2, wherein the ball valve mechanism comprises:

the lower end of the lower seat ring (20) is detachably connected to the internal thread at the lower end of the tieback outer cylinder (14) through external threads, and the lower seat ring is provided with a second inner hole structure communicated with the first inner hole structure;

the ball cage (18) is embedded between the upper end of the lower seat ring (20) and the tieback outer barrel (14), a cavity structure is formed between the interior of the ball cage and the lower seat ring (20), and the cavity structure is communicated with the second inner hole structure;

the ball valve assembly (19) is rotatably embedded in the cavity structure, is internally provided with a third inner hole structure, and can enable the third inner hole structure to be in a closed state or a communicated state with the second inner hole structure through self rotation; and

and the ball valve driving device is connected with the ball valve assembly (19) and is used for driving the ball valve assembly (19) to rotate.

4. A downhole on-off valve according to claim 3, wherein the ball valve assembly (19) is provided with two radial apertures (30) and the ball valve driving means comprises:

the two operating pins (17) are slidably arranged on the outer side of the upper end of the ball cage (18), the inner side surface of each operating pin is provided with a radial spherical lug (27), each radial spherical lug (27) is arranged between the corresponding radial small holes (30) in a penetrating mode to drive the ball valve assembly (19) to rotate, and the upper end of the inner side of each operating pin (17) is provided with a first annular groove (28);

and the elastic claw (16) is arranged in the first inner hole structure of the tieback outer cylinder (14), the upper end of the elastic claw is provided with a circular claw-shaped structure, and the outer side of the lower end of the elastic claw is provided with a second annular groove (29), so that the elastic claw (16) is connected with the operating pin by forming embedded connection with the first annular groove.

5. The downhole switch valve of claim 4, wherein the release tool comprises:

the lower end of the pull-out short section (26) is rotatably connected with internal threads at the upper end of a first inner hole structure of the tie-back outer cylinder (14) through external threads, and a fourth inner hole structure communicated with the first inner hole structure is arranged inside the pull-out short section;

the lower end of the first rupture disc outer cylinder (21) is rotatably connected with the external thread at the upper end of the pull-out short section (26) through external threads, and a fifth inner hole structure communicated with the fourth inner hole structure is arranged in the first rupture disc outer cylinder;

the first mandrel (22) is slidably arranged in a fifth inner hole structure of the first rupture disc outer cylinder (21), the lower end of the first mandrel (22) is clamped with a claw-shaped structure of the elastic claw (16), and a first air channel is formed between the first mandrel and the first rupture disc outer cylinder (21); and

and a first rupture disc (24) which is arranged between the first rupture disc outer cylinder (21) and the first mandrel (22) in a sealing mode and can selectively enable gas or liquid pressure to enter the first air path.

6. The downhole switch valve of claim 5, wherein the release tool comprises:

the first shear pin (25) is arranged between a radial small hole (30) at the upper end of the pull-out short section (26) and an annular groove (31) on the outer side of the first mandrel (22) and is used for limiting the relative position of the pull-out short section (26) and the first mandrel (22) along the vertical direction;

a first cushion (23) provided in a first slidable gap between the first rupture disc outer cylinder (21) and the first mandrel (22);

wherein the first slidable gap and the first air passage are sealed by a gasket.

7. A downhole on-off valve according to claim 6, wherein the first burst disk (24) is threadedly secured to a shoulder at an upper end of the fifth bore structure of the first burst disk outer cylinder (21) and is adapted to be driven to break by internal pressure of the fifth bore structure, thereby allowing gas or liquid pressure to enter the first gas path and push the first mandrel (22) to slide upwardly within the fifth bore structure of the first burst disk outer cylinder (21).

8. A downhole on-off valve according to claim 6, wherein the first rupture disc is fixed on the excircle of the first rupture disc outer cylinder (21) by screw thread, and is driven to break by the external pressure of the first rupture disc outer cylinder (21), thereby allowing gas or liquid pressure to enter the first gas path and pushing the first mandrel (22) to slide upwards in the fifth inner hole structure of the first rupture disc outer cylinder (21).

9. The downhole switch valve of claim 4, wherein the tieback tool comprises:

the lower end of the air chamber outer cylinder (2) is connected to the first inner hole structure of the tie-back outer cylinder (14) in an inserting mode and is provided with a sixth inner hole structure communicated with the first inner hole structure;

the second mandrel (5) penetrates into a sixth inner hole structure of the air chamber outer cylinder (2) from the upper end, and a second air channel is formed between the second mandrel and the air chamber outer cylinder (2);

a second rupture disc (3) which is hermetically arranged on a second air path between the air chamber outer cylinder (2) and the second mandrel (5) and can selectively enable gas or liquid pressure to enter the second air path; and

and the anchoring claw (10) is arranged at the position of a shoulder (33) in the middle of the excircle of the air chamber outer cylinder (2) in a penetrating way from the lower end of the air chamber outer cylinder (2).

10. The downhole switch valve of claim 9, wherein the tieback tool comprises:

the second limiting sleeve (11) is detachably connected with the lower end of the air chamber outer cylinder (2) through threads and is positioned at the lower end of the anchoring claw (10);

the three closing components (12) penetrate through the outer circumferential surface of the lower end of the air chamber outer cylinder (2) and are positioned on the lower side of the second limiting sleeve (11); and

and the guide joint (13) is detachably connected to the lower end of the air chamber outer cylinder (2) through threads and is positioned on the lower sides of the three closing components (12).

11. The downhole switch valve of claim 9, wherein the tieback tool comprises:

the shearing pin sleeve (8) is arranged in an annular cavity between the air chamber outer cylinder (2) and the second mandrel (5), is used for fixing the relative position of the second mandrel (5) and the air chamber outer cylinder (2), and is provided with a radial hole;

the second shear pin (7) is fixed on the outer peripheral surface of the second mandrel (5) through a radial hole in the shear pin sleeve (8);

a second cushion (9) provided in a second slidable gap between the air chamber outer cylinder (2) and the second spindle (5);

12. The downhole switch valve of claim 11, wherein the tieback tool comprises:

the sealing sleeve (4) is arranged in an annular cavity between the air chamber outer cylinder (2) and the second mandrel (5), is positioned on the outer side of the shear pin sleeve (8), and is provided with an outer circular shoulder (32) at the upper end, and can be clamped with an inner hole shoulder of the air chamber outer cylinder (2) to limit the downward movement of the sealing sleeve (4);

the check ring (1) is in threaded connection with a first inner hole structure of the air chamber outer cylinder (2) and is arranged at the upper end of the sealing sleeve (4) so as to limit the upward movement of the sealing sleeve (4); and

and the locking ring (6) is arranged in an annular groove at the upper end of the second mandrel (5), is positioned at the upper end of the second shear pin (7), and is used for locking the position of the second mandrel (5) so as to keep the opening state of the ball valve.

13. A downhole on-off valve according to claim 12, wherein the second rupture disc (3) is threadedly fixed in the inner bore of the sealing sleeve (4) and is driven to break by the internal pressure of the sealing sleeve (4), thereby allowing gas or liquid pressure to enter the second gas path and pushing the second mandrel (5) to slide downwards in the sixth inner bore structure of the air chamber outer cylinder (2).

14. A downhole on-off valve according to claim 12, wherein the second rupture disc (3) is fixed on the outer circle of the air chamber outer cylinder (2) by screw thread, and can be driven by the internal pressure of the sealing sleeve (4) to break itself, so that gas or liquid pressure enters the second air path and pushes the second mandrel (5) to slide to the lower end in the sixth inner hole structure of the air chamber outer cylinder (2).