Blowout prevention throttle valve

Abstract

The invention discloses a blowout prevention throttle valve which comprises an outer casing pipe, an inner casing pipe, a channel sealing mechanism connected with the lower end of the inner casing pipe and used for sealing the inner casing pipe, a channel opening mechanism used for opening a valve cover in an ejecting mode and a locking mechanism used for locking sliding of a core shaft pipe, and threads used for being connected with an oil pipe column are arranged at the upper end and the lower end of the outer casing pipe respectively. The inner sleeve is fixedly connected in the outer sleeve, and the channel closing mechanism comprises a valve cover and a torsion spring. By arranging the outer sleeve, the inner sleeve and the channel sealing mechanism which is connected with the lower end of the inner sleeve and used for sealing the inner sleeve, CO2 mixed crude oil is prevented from being sprayed out when an oil pipe column is lifted and lowered; the channel opening mechanism used for pushing open the valve cover and the locking mechanism used for locking sliding of the core shaft pipe are arranged, when a preset distance is reached in a well, the locking mechanism is opened, so that the core shaft pipe loses axial constraint to push open the valve cover to form a channel, and CO2 mixed crude oil flows out smoothly; the problem that CO2 mixed crude oil is sprayed out of an oil pipe column when the oil pipe column is lifted is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil production equipment, and in particular relates to a blowout prevention throttle valve. Background Art

[0002] At present, some domestic oil fields have entered the middle and late stages of development. In order to effectively improve the recovery rate, some old wells have adopted CO 2 The measures to increase oil production have achieved remarkable results. 2 There are many well control and personal injury risks in the operation and construction of gas injection wells and effective wells. 2 The mixed crude oil will instantly spray out from the oil pipe string, and its spraying speed is extremely fast and there is no sign of overflow, which makes it impossible for the wellhead workers to shut down the well in advance for control. In addition, there is no regularity in the time and scale of the spraying. Often, a spraying phenomenon will occur every few oil pipe strings, making it difficult to grasp its spraying pattern. Moreover, the energy released instantly is huge, posing a serious threat to the personal safety of the wellhead workers. Summary of the invention

[0003] In view of the problems existing in the prior art, the object of the present invention is to provide a blowout prevention throttle valve.

[0004] To solve the above problems, the present invention adopts the following technical solutions: The closure of the valve body is connected with the closure of the valve body to form a closure for the valve body, and the closure of the valve body is connected with the closure of the valve body to form a closure for the valve body. The locking mechanism of the shaft tube sliding comprises a shear pin sleeve, a shear pin and a locking block, the shear pin sleeve is slidably connected between the outer sleeve and the inner sleeve, the inner hole of the shear pin sleeve is a stepped inner hole with a small aperture in the upper half and a large aperture in the lower half, the inner sleeve is provided with a first through hole penetrating the side wall of the inner sleeve, the outer wall of the core shaft tube is provided with a circle of trapezoidal grooves, one end of the locking block is truncated cone-shaped, and the trapezoidal groove can be aligned with the first through hole when the core shaft tube is above the valve cover, the locking block is slidably inserted in the first through hole, the shear pin sleeve is provided with a second through hole penetrating the side wall of the shear pin sleeve, an annular groove is provided on the outer wall of the inner sleeve, and when the second through hole is aligned with the annular groove, the upper half of the shear pin sleeve is located at the end of the first through hole, one end of the locking block is truncated cone-shaped and connected in the trapezoidal groove, and the other end abuts against the inner wall of the upper half of the shear pin sleeve, and the shear pin is inserted in the second through hole and the annular groove.

[0005] Preferably, the difference between the hole radius of the upper half and the lower half of the inner hole of the shear pin sliding sleeve is m, the length of the locking block connected in the trapezoidal groove is n, and m≥n.

[0006] Preferably, the outer sleeve is divided into three sections, which are an upper joint, a connecting short section and a lower joint from top to bottom, the upper end of the inner wall of the upper joint is provided with an internal thread for connecting an oil pipe string, the lower end of the upper joint is threadedly connected to the inner wall of the upper end of the connecting short section, the lower end of the connecting short section is threadedly connected to the inner wall of the upper end of the lower joint, the lower end of the outer wall of the lower joint is provided with an external thread for connecting an oil pipe string, the step is provided at the upper end of the inner wall of the upper joint to protrude inwardly, the inner sleeve is fixedly connected to the lower end of the inner wall of the connecting short section, and the shear pin sliding sleeve is slidably connected between the lower joint and the inner sleeve.

[0007] Preferably, the inner sleeve and the connecting nipple are fixedly connected by setscrews threadedly connected on the side walls of the inner sleeve and the connecting nipple.

[0008] Preferably, elastic sealing rings are provided between the shear pin sliding sleeve and the lower joint and the inner sleeve.

[0009] Preferably, elastic sealing rings are provided between the connecting short section and the upper joint and the lower joint.

[0010] Preferably, the upper joint and the connecting short section are fixedly connected by means of set screws threadedly connected to the side walls of the two, and the connecting short section and the lower joint are fixedly connected by means of set screws threadedly connected to the side walls of the two.

[0011] Beneficial effects of the present invention: Compared with the prior art, the advantages of the present invention are: The present invention prevents CO from leaking when the oil pipe string is raised or lowered by arranging an outer casing, an inner casing and a channel sealing mechanism connected to the lower end of the inner casing for sealing the inner casing. 2 The mixed crude oil is sprayed out from the oil pipe string; a channel opening mechanism for opening the valve cover and a locking mechanism for locking the mandrel tube to slide are provided. When the predetermined distance is reached in the well, the locking mechanism is opened, so that the mandrel tube loses its axial constraint and the valve cover is opened to form a channel. 2 The mixed crude oil flows out smoothly, solving the problem of preventing CO from leaking when tripping the oil pipe string. 2 The problem of mixed crude oil spraying out from the oil pipe string. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the core shaft tube of the present invention when the valve cover is pushed open; Figure 3 It is a schematic diagram of the exploded parts of the present invention.

[0013] In the figure: 1, outer sleeve; 11, upper joint; 111, step; 12, connecting short section; 13, lower joint; 2, inner sleeve; 21, first through hole; 31, valve cover; 32, torsion spring; 41, core shaft tube; 411, boss; 412, trapezoidal groove; 413, annular groove; 42, spring; 51, shear pin sleeve; 511, second through hole; 52, shear pin; 53, locking block; 6, set screw; 7, elastic sealing ring. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] like Figure 1-3 As shown, the present invention provides a technical solution: a blowout prevention throttle valve, comprising an outer sleeve 1, wherein the upper and lower ends of the outer sleeve 1 are respectively provided with threads for connecting to a tubing string; an inner sleeve 2, wherein the inner sleeve 2 is fixedly connected to the outer sleeve 1; a channel closing mechanism connected to the lower end of the inner sleeve 2 for closing the inner sleeve 2, wherein the channel closing mechanism comprises a valve cover 31 and a torsion spring 32 that can be covered on the lower end of the inner sleeve 2, wherein one side of the valve cover 31 is hinged to the inner sleeve 2, and the torsion spring 32 is connected to the hinged joint of the valve cover 31 and the inner sleeve 2 to provide elastic force to make the valve cover 31 cover tightly At the lower end of the inner sleeve 2; a channel opening mechanism for pushing open the valve cover 31, the channel opening mechanism includes a core shaft tube 41 and a spring 42, the core shaft tube 41 is slidably connected in the outer sleeve 1 and the inner sleeve 2, the upper end of the inner wall of the outer sleeve 1 is protruding inwardly with a step 111, and the outer wall of the core shaft tube 41 is protruding outwardly with a boss 411, the spring 42 is sleeved on the outer wall of the core shaft tube 41, and the upper and lower ends of the spring 42 are crimped between the step 111 and the boss 411 to provide elastic force to make the core shaft tube 41 slide downward and push open the valve cover 31; and a spring 42 for locking the core shaft The locking mechanism of the tube 41 slides, the locking mechanism includes a shear pin sliding sleeve 51, a shear pin 52 and a locking block 53, the shear pin sliding sleeve 51 is slidably connected between the outer sleeve 1 and the inner sleeve 2, the inner hole of the shear pin sliding sleeve 51 is a stepped inner hole with a small aperture in the upper half and a large aperture in the lower half, the inner sleeve 2 is provided with a first through hole 21 penetrating the side wall of the inner sleeve 2, the outer wall of the core shaft tube 41 is provided with a circle of trapezoidal grooves 412, one end of the locking block 53 is truncated, and when the core shaft tube 41 is above the valve cover 31, the trapezoidal groove 412 can be aligned with the first through hole 2 1, the locking block 53 is slidably inserted in the first through hole 21, the shear pin sliding sleeve 51 is provided with a second through hole 511 penetrating the side wall of the shear pin sliding sleeve 51, and the outer wall of the inner sleeve 2 is provided with an annular groove 413. When the second through hole 511 is aligned with the annular groove 413, the upper half of the shear pin sliding sleeve 51 is located at the end of the first through hole 21, one end of the truncated cone-shaped locking block 53 is connected to the trapezoidal groove 412, and the other end abuts against the inner wall of the upper half of the shear pin sliding sleeve 51, and the shear pin 52 is inserted in the second through hole 511 and the annular groove 413.

[0016] When in use, the upper and lower ends of the outer casing 1 are connected to the oil pipe string and run down the well with the oil pipe string. The inner casing 2 is fixed in the outer casing 1. The valve cover 31 is tightly covered on the lower end of the inner casing 2 under the action of the torsion spring 32 and the pressure from the lower part of the oil pipe string to close the channel and prevent CO from 2 The mixed crude oil is ejected from the tubing string. When the well reaches a predetermined distance, the oil pipe string is pressurized from above, and CO 2 The gas pushes open the valve cover 31 to enter, CO 2The mixed crude oil squeezes the shear pin sleeve 51 upward. When the pressure reaches a certain level, the second through hole 511 of the shear pin sleeve 51 cooperates with the annular groove 413 of the inner sleeve 2 to cut off the shear pin 52. The shear pin sleeve 51 slides upward so that the lower half of the shear pin sleeve 51 is located at the end of the first through hole 21. The end of the locking block 53 loses the support of the inner wall of the shear pin sleeve 51. At the same time, the elastic force of the spring 42 squeezes the core shaft tube 41 downward. Since one end of the locking block 53 is truncated and connected to the trapezoidal groove 412 on the surface of the core shaft tube 41, the two are inclined. The inclined surface of the trapezoidal groove 412 pushes the locking block 53 outward, and the core shaft tube 41 loses axial constraint. It slides downward under the push of the elastic force of the spring 42 to push open the valve cover 31 to form a channel, and CO 2 The mixed crude oil flows out smoothly, thus solving the problem of preventing CO from leaking when tripping the oil pipe string. 2 The problem of mixed crude oil spraying out from the oil pipe string.

[0017] Furthermore, the difference between the radius of the upper and lower parts of the inner hole of the shear pin sliding sleeve 51 is m, and the length of the locking block 53 connected in the trapezoidal groove 412 is n, m ≥ n, so as to ensure that there is enough space for the locking block 53 to retreat, and when it is squeezed by the core shaft tube 41, it can move outward stably, and ensure that the core shaft tube 41 can slide down smoothly under the action of the spring 42 to push open the valve cover 31 to form a channel, so that CO 2 The mixed crude oil flows out smoothly.

[0018] Furthermore, the outer sleeve 1 is divided into three sections, which are an upper joint 11, a connecting short section 12 and a lower joint 13 from top to bottom. The upper end of the inner wall of the upper joint 11 is provided with an internal thread for connecting a tubing string. The lower end of the upper joint 11 is threadedly connected to the inner wall of the upper end of the connecting short section 12. The lower end of the connecting short section 12 is threadedly connected to the inner wall of the upper end of the lower joint 13. The lower end of the outer wall of the lower joint 13 is provided with an external thread for connecting a tubing string. The step 111 is protruding inwardly at the upper end of the inner wall of the upper joint 11. The inner sleeve 2 is fixedly connected to the lower end of the inner wall of the connecting short section 12. The shear pin sliding sleeve 51 is slidably connected between the lower joint 13 and the inner sleeve 2.

[0019] During assembly, the inner sleeve 2 is first fixedly connected to the lower end of the inner wall of the connecting short section 12, the valve cover 31 and the torsion spring 32 are installed, and then the core shaft tube 41 is inserted into the inner sleeve 2 from the upper end of the connecting short section 12, so that the trapezoidal groove 412 is aligned with the first through hole 21, and the locking block 53 is installed to ensure that the truncated cone end of the locking block 53 is embedded in the trapezoidal groove 412, and then the shear pin sliding sleeve 51 is sleeved on the inner sleeve 2, so that the second through hole 511 is aligned with the annular groove 413, and the shear pin 52 is inserted, and then the lower joint 13 is threadedly connected to the lower end of the connecting short section 12, and then the spring 42 is sleeved from above on the outside of the core shaft tube 41, and the lower end of the spring 42 is against the boss 411, and finally the upper joint 11 is threadedly connected to the upper end of the connecting short section 12, and the step 111 in the upper joint 11 presses the spring 42 downward to generate elastic force, providing axial pressure for the core shaft tube 41. The three-stage design of the outer sleeve 1 is convenient for assembly and disassembly.

[0020] Specifically, the inner sleeve 2 and the connecting nipple 12 are fixedly connected by means of set screws 6 threadedly connected to the side walls of the inner sleeve 2 and the connecting nipple 12 .

[0021] Furthermore, the cooperation between the shear pin sleeve 51 and the lower joint 13, the inner sleeve 2 and the valve cover 31 is the connection between the lower end of the blowout prevention throttle valve and the CO 2 The contact part of the mixed crude oil prevents gas and oil leakage from the matching gap between the shear pin sliding sleeve 51 and the lower joint 13 and the inner sleeve 2 when the valve cover 31 is closed. Elastic sealing rings 7 are arranged between the shear pin sliding sleeve 51 and the lower joint 13 and the inner sleeve 2 to form a tight sealing structure to ensure no leakage.

[0022] Furthermore, elastic sealing rings 7 are provided between the connecting nipple 12 and the upper joint 11 and the lower joint 13, thereby improving the overall sealing performance of the blowout prevention throttle valve.

[0023] Furthermore, the upper joint 11 and the connecting short section 12 are fixedly connected by means of set screws 6 threadedly connected to the side walls of the two, and the connecting short section 12 and the lower joint 13 are fixedly connected by means of set screws 6 threadedly connected to the side walls of the two, thereby ensuring that the various sections of the outer sleeve 1 are firmly and reliably connected.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blowout prevention throttle valve, characterized in that: include: An outer sleeve (1), wherein the upper and lower ends of the outer sleeve (1) are respectively provided with threads for connecting to an oil pipe string; An inner sleeve (2), the inner sleeve (2) being fixedly connected inside the outer sleeve (1); A channel sealing mechanism connected to the lower end of the inner sleeve (2) for sealing the inner sleeve (2), the channel sealing mechanism comprising a valve cover (31) that can cover the lower end of the inner sleeve (2) and a torsion spring (32), one side of the valve cover (31) is hinged to the inner sleeve (2), and the torsion spring (32) is connected to the hinged joint between the valve cover (31) and the inner sleeve (2) to provide elastic force so that the valve cover (31) is tightly covered on the lower end of the inner sleeve (2); A channel opening mechanism for pushing open the valve cover (31), the channel opening mechanism comprising a core shaft tube (41) and a spring (42), the core shaft tube (41) being slidably connected inside the outer sleeve (1) and the inner sleeve (2), the upper end of the inner wall of the outer sleeve (1) being provided with a step (111) protruding inwardly, and the outer wall of the core shaft tube (41) being provided with a boss (411) protruding outwardly, the spring (42) being sleeved on the outer wall of the core shaft tube (41), and the upper and lower ends of the spring (42) being crimped between the step (111) and the boss (411) to provide elastic force to enable the core shaft tube (41) to slide downward and push open the valve cover (31); and a locking mechanism for locking the core shaft tube (41) to slide, the locking mechanism comprising a shear pin sleeve (51), a shear pin (52) and a locking block (53); the shear pin sleeve (51) is slidably connected between the outer sleeve (1) and the inner sleeve (2); the inner hole of the shear pin sleeve (51) is a stepped inner hole with a small hole diameter in the upper half and a large hole diameter in the lower half; the inner sleeve (2) is provided with a first through hole (21) penetrating the side wall of the inner sleeve (2); the outer wall of the core shaft tube (41) is provided with a circle of trapezoidal grooves (412); one end of the locking block (53) is truncated; when the core shaft tube (41) is above the valve cover (31), the trapezoidal groove (412) can be aligned with the first through hole (21) to form a circle of trapezoidal grooves (412); The locking block (53) is slidably inserted in the first through hole (21), the shear pin sliding sleeve (51) is provided with a second through hole (511) penetrating the side wall of the shear pin sliding sleeve (51), an annular groove (413) is provided on the outer wall of the inner sleeve (2), and when the second through hole (511) is aligned with the annular groove (413), the upper half of the shear pin sliding sleeve (51) is located at the end of the first through hole (21), one end of the locking block (53) is truncated and connected to the trapezoidal groove (412), and the other end abuts against the inner wall of the upper half of the shear pin sliding sleeve (51), and the shear pin (52) is inserted in the second through hole (511) and the annular groove (413).

2. A blowout prevention throttle valve according to claim 1, characterized in that: The difference between the hole radius of the upper half and the lower half of the inner hole of the shear pin sliding sleeve (51) is m, and the length of the locking block (53) connected in the trapezoidal groove (412) is n, where m≥n.

3. A blowout prevention throttle valve according to claim 1, characterized in that: The outer sleeve (1) is divided into three sections, which are, from top to bottom, an upper joint (11), a connecting nipple (12) and a lower joint (13). The upper end of the inner wall of the upper joint (11) is provided with an internal thread for connecting to a tubing string. The lower end of the upper joint (11) is threadedly connected to the inner wall of the upper end of the connecting nipple (12). The lower end of the connecting nipple (12) is threadedly connected to the inner wall of the upper end of the lower joint (13). The lower end of the outer wall of the lower joint (13) is provided with an external thread for connecting to a tubing string. The step (111) is provided inwardly protruding from the upper end of the inner wall of the upper joint (11). The inner sleeve (2) is fixedly connected to the lower end of the inner wall of the connecting nipple (12). The shear pin sliding sleeve (51) is slidably connected between the lower joint (13) and the inner sleeve (2).

4. A blowout prevention throttle valve according to claim 3, characterized in that: The inner sleeve (2) and the connecting nipple (12) are fixedly connected via set screws (6) threadedly connected to the side walls of the two.

5. A blowout prevention throttle valve according to claim 3, characterized in that: An elastic sealing ring (7) is provided between the shear pin sliding sleeve (51), the lower joint (13) and the inner sleeve (2).

6. A blowout prevention throttle valve according to claim 3, characterized in that: Elastic sealing rings (7) are provided between the connecting short section (12) and the upper joint (11) and the lower joint (13).

7. A blowout prevention throttle valve according to claim 3, characterized in that: The upper joint (11) and the connecting short section (12) are fixedly connected by means of set screws (6) threadedly connected to the side walls of the two, and the connecting short section (12) and the lower joint (13) are fixedly connected by means of set screws (6) threadedly connected to the side walls of the two.

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