Automatic safety valve for annular blowout prevention during drilling

Abstract

The present invention belongs to the technical field of oil and gas drilling, and specifically relates to an annular blowout prevention automatic safety valve under drilling conditions, to alleviate the problem that existing blowout prevention tools can only be used for automatic blowout prevention in drilling tools. The annular blowout prevention automatic safety valve includes a valve body with an axial hollow structure and a plurality of valve plates evenly distributed in an annular manner inside the valve body; one end of the valve plate is hinged to the valve body, and the other end of the valve plate is set as a swing end; the end at which the valve plate is hinged to the valve body is the first end, and the swing end is the second end; the valve plate has a first state and a second state, in the first state, the second end of each valve plate is in a low position, in the second state, the second end is in a high position and each second end is arranged to form a circular ring, and the circular ring matches the drill pipe. The device has a simple structure, and can automatically close the annulus under the driving action of the fluid to prevent the further development of the blowout out of control, thereby ensuring the safety of drilling.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas drilling, and in particular relates to an annular blowout prevention automatic safety valve under drilling conditions. Background Art

[0002] With the continuous exploration and development of oil and gas resources, the number of high-pressure wells and sulfur-containing oil and gas wells drilled has increased year by year. Blowouts and uncontrolled blowouts often occur, especially in high-yield oil and gas areas. In addition, due to the lack of understanding of geological conditions during the drilling of exploratory wells, the risk of blowouts and uncontrolled blowouts is also relatively high. Blowouts and uncontrolled blowouts not only cause waste of resources and adverse social impacts, but may also cause aircraft damage and loss of life.

[0003] Currently, the tools for automatically preventing blowouts in drilling tools include arrow-shaped back pressure valves, ball back pressure valves, etc., but there are no annular blowout prevention tools under drilling conditions.

[0004] Therefore, in order to reduce the risk of blowout and uncontrolled blowout and increase drilling safety, it is necessary to develop an annular blowout prevention automatic safety valve under drilling conditions. Summary of the invention

[0005] The invention provides an annular space blowout prevention automatic safety valve under drilling state, so as to alleviate the problem that the existing blowout prevention tool can only be used for automatic blowout prevention in drilling tools.

[0006] In order to alleviate the above technical problems, the technical solution provided by the present invention is:

[0007] An annular blowout prevention automatic safety valve under drilling state comprises a valve body with an axial hollow structure and a plurality of valve plates evenly distributed in an annular manner inside the valve body; one end of the valve plate is hinged to the valve body, and the other end of the valve plate is arranged as a swing end; the end at which the valve plate is hinged to the valve body is the first end, and the swing end is the second end; the valve plate has a first state and a second state, in the first state, the second end of each valve plate is in a low position, in the second state, the second end is in a high position and each second end is arranged to form a circular ring, and the circular ring matches the drill pipe.

[0008] Furthermore, the second end is configured as a concave arc surface, and in the second state, the arc surfaces of the second ends of each valve plate are configured to form a continuous circular ring.

[0009] Furthermore, it also includes a plurality of pull rods, the end of the pull rod near the valve plate is hinged to the lower surface of the valve plate, and the end of the pull rod far from the valve plate is slidably connected along the inner wall of the valve body; the pull rod, the valve plate and the valve body located between the pull rod and the valve plate form a triangular structure.

[0010] Furthermore, a sliding shaft is arranged at the end of the pull rod far from the valve plate, a sliding groove is arranged on the inner wall of the valve body, and the sliding shaft is slidably connected to the sliding groove.

[0011] Furthermore, in the first state, the sliding shaft is located at the bottom of the sliding groove, and in the second state, the sliding shaft is located at the top of the sliding groove.

[0012] Furthermore, it also includes an annular fixed shoulder, and the first end of the valve plate is connected to the valve body through the fixed shoulder.

[0013] Furthermore, it also includes an annular locking frame connected to the valve body, the annular locking frame includes a plurality of annularly arranged limiting components, the limiting components are arranged below the slide groove, and the plurality of limiting components are arranged one-to-one correspondingly to the plurality of slide grooves.

[0014] Furthermore, the limiting assembly includes two longitudinal rods arranged at intervals, and locking pins are respectively provided on the opposite side walls of the two longitudinal rods; first positioning holes are provided on both side walls of the pull rod; when the two locking pins are clamped in the two first positioning holes, the pull rod is locked by the limiting assembly.

[0015] Furthermore, an internal thread is provided on the upper inner wall of the valve body, an external thread is provided on the lower outer wall of the valve body, the valve body is threadedly connected to the upper casing via the internal thread, and the valve body is threadedly connected to the lower casing via the external thread.

[0016] An annular blowout prevention operation equipment under drilling state comprises the above-mentioned annular blowout prevention automatic safety valve under drilling state.

[0017] The beneficial effects of the annular blowout prevention automatic safety valve under drilling conditions in the present invention are analyzed as follows:

[0018] The annular blowout prevention automatic safety valve comprises a valve body with an axial hollow structure and a plurality of valve plates evenly distributed in an annular manner inside the valve body; one end of the valve plate is hinged to the valve body, and the other end of the valve plate is arranged as a swing end; the end at which the valve plate is hinged to the valve body is the first end, and the swing end is the second end; the valve plate has a first state and a second state, in the first state, the second end of each valve plate is in a low position, in the second state, the second end is in a high position and each second end is arranged to form a circular ring, and the circular ring matches the drill pipe.

[0019] When in the first state, the safety valve is in an open state. When a blowout occurs in the well, the fluid pushes the valve plate upward, and the second end of each valve plate moves upward to change from a low position to a high position. The second end of each valve plate is surrounded to form a ring, and the outer wall of the ring is connected to the inner wall of the valve body, and the inner wall of the ring is connected to the outer wall of the drill pipe. A closed space is formed between each valve plate, the drill pipe, the valve body and the well wall, thereby closing the annulus. The device has a simple structure and can automatically close the annulus under the driving action of the fluid, preventing the further development of the blowout, thereby ensuring the safety of drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A longitudinal section of an annular blowout prevention automatic safety valve in a drilling state provided by an embodiment of the present invention;

[0022] Figure 2 A schematic structural diagram of a valve plate provided in an embodiment of the present invention;

[0023] Figure 3 An isometric view of an annular blowout prevention automatic safety valve body under drilling conditions provided by an embodiment of the present invention;

[0024] Figure 4 A top view of the closed state of the annular blowout prevention automatic safety valve provided in the embodiment of the present invention under the drilling state;

[0025] Figure 5 An isometric diagram of an annular blowout prevention automatic safety valve under drilling conditions provided by an embodiment of the present invention;

[0026] Figure 6 A schematic structural diagram of a locking frame provided in an embodiment of the present invention;

[0027] Figure 7 A schematic structural diagram of a pull rod provided in an embodiment of the present invention.

[0028] icon:

[0029] 100-valve body; 200-valve plate; 300-fixed shoulder; 400-pull rod; 500-locking frame; 110-slide groove; 120-external thread; 130-internal thread; 140-fourth connecting hole; 210-first end; 211-first protrusion; 212-first connecting hole; 230-second end; 231-second protrusion; 232-fourth connecting hole; 310-first groove; 320-second positioning hole; 410-second groove; 420-second connecting hole; 430-sliding shaft; 440-first positioning hole; 510-longitudinal rod; 520-locking pin; 530-third connecting hole. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementation. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the base units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] With the continuous exploration and development of oil and gas resources, the number of high-pressure wells and sulfur-containing oil and gas wells drilled has increased year by year. Blowouts and uncontrolled blowouts often occur, especially in high-yield oil and gas areas. In addition, due to the lack of understanding of geological conditions during the drilling of exploratory wells, the risk of blowouts and uncontrolled blowouts is also relatively high. Blowouts and uncontrolled blowouts not only cause waste of resources and adverse social impacts, but may also cause aircraft damage and loss of life.

[0034] Currently, the tools for automatically preventing blowouts in drilling tools include arrow-shaped back pressure valves, ball back pressure valves, etc., but there are no annular blowout prevention tools under drilling conditions.

[0035] In view of this, the present invention provides an annular blowout prevention automatic safety valve under drilling conditions, please refer to Figures 1 to 7The annular blowout prevention automatic safety valve comprises a valve body 100 with an axial hollow structure and a plurality of valve plates 200 evenly distributed in an annular manner on the inner side of the valve body 100; one end of the valve plate 200 is hinged to the valve body 100, and the other end of the valve plate 200 is set as a swing end; the end at which the valve plate 200 is hinged to the valve body 100 is the first end 210, and the swing end is the second end 230; the valve plate 200 has a first state and a second state, in the first state, the second ends 230 of each valve plate 200 are in a low position, in the second state, the second ends 230 are in a high position and each second end 230 is arranged to form a circular ring, and the circular ring matches the drill pipe.

[0036] When in the first state, the safety valve is in an open state. When a blowout occurs in the well, the fluid pushes the valve plate 200 upward, and the second end 230 of each valve plate 200 moves upward to convert from a low position to a high position. The second end 230 of each valve plate 200 is surrounded to form a ring, and the outer wall of the ring is connected to the inner wall of the valve body 100, and the inner wall of the ring is connected to the outer wall of the drill pipe. A closed space is formed between each valve plate 200, the drill pipe, the valve body 100 and the well wall, thereby closing the annulus. The device has a simple structure and can automatically close the annulus under the driving action of the fluid to prevent the further development of the blowout, thereby ensuring the safety of drilling.

[0037] The shape and structure of the valve plate 200 are described in detail as follows:

[0038] The second end 230 of the valve plate 200 is configured as a concave arc surface. In the second state, the arc surfaces of the second ends 230 of each valve plate 200 are configured to form a continuous ring.

[0039] Furthermore, the first end 210 of the valve plate 200 is configured as an outwardly convex arc surface, and the arc surfaces of the first ends 210 of each valve plate 200 are configured to form a continuous circular ring.

[0040] In the first state, the second end 230 of the valve plate 200 is in a low position, and the safety valve is in an open state; in the second state, the second end 230 of the valve plate 200 is in a high position, adjacent valve plates 200 are fitted together, and each valve plate 200 is arranged to form a circular ring, the outer ring of the circular ring is connected to the valve body 100, and the inner ring of the circular ring is mounted on the drill pipe.

[0041] In an optional scheme of this embodiment, the movement of the second end 230 of the valve plate 200 from a high position to a low position is driven by the pull rod 400, the proximal valve plate end of the pull rod 400 is hinged to the lower surface of the valve plate 200, and the distal valve plate end of the pull rod 400 is slidably connected along the inner wall of the valve body 100; the pull rod 400, the valve plate 200 and the valve body 100 located between the pull rod 400 and the valve plate 200 form a triangular structure.

[0042] The hinge connection between the pull rod 400 and the valve plate 200 is described in detail as follows:

[0043] The pull rod 400 is hinged to the valve plate 200 through a pin shaft, and a second groove 410 is provided at the end of the pull rod 400 near the valve plate, and second connecting holes 420 are respectively provided on two opposite side walls of the second groove 410; a second protrusion 231 is provided at the lower part of the valve plate 200 near the second end 230, and a fourth connecting hole 232 is provided on the second protrusion 231; the second protrusion 231 is inserted into the second groove 410, the pin shaft passes through the fourth connecting hole 232 and the two ends of the pin shaft are respectively inserted into the two opposite second connecting holes 420, thereby realizing the hinge connection between the pull rod 400 and the valve plate 200.

[0044] In an optional solution of this embodiment, a sliding shaft 430 is provided at the distal end of the pull rod 400, a slide groove 110 is provided on the inner wall of the valve body 100, and the sliding shaft 430 is slidably connected to the slide groove 110. In the first state, the sliding shaft 430 is located at the bottom of the slide groove 110, and in the second state, the sliding shaft 430 is located at the top of the slide groove 110. The sliding of the pull rod 400 in the slide groove 110 drives the movement of the second end 230 of the valve plate 200.

[0045] In an optional solution of this embodiment, the safety valve also includes an annular fixed shoulder 300, the first end 210 of the valve plate 200 is connected to the valve body 100 through the fixed shoulder 300, the outer side of the fixed shoulder 300 is fixedly connected to the inner wall of the valve body 100, and the inner side of the fixed shoulder 300 is hinged to each valve plate 200.

[0046] Please refer to Figures 2 to 4 The connection method between the fixed shoulder 300 and the valve plate 200 is described in detail as follows:

[0047] Preferably, the fixed shoulder 300 is hinged to the valve plate 200 via a pin. A plurality of first grooves 310 are provided on the inner wall of the fixed shoulder 300, and a second positioning hole 320 is provided on the inner wall of both sides of each first groove 310;

[0048] The first end 210 of the valve plate 200 is provided with a first protrusion 211 corresponding to the first groove 310, and the first protrusion 211 is provided with a first connecting hole 212;

[0049] The first protrusion 211 is inserted into the first groove 310 , and the pin passes through the first connecting hole 212 and is respectively inserted into the two second positioning holes 320 of the first groove 310 , thereby realizing the hinge connection between the valve plate 200 and the fixed shoulder 300 .

[0050] In the optional solution of this embodiment, please refer to Figure 5 and Figure 6, and also includes an annular locking frame 500 connected to the valve body 100, and a plurality of third connecting holes 530 are evenly distributed in an annular manner on the locking frame 500, and a plurality of fourth connecting holes 140 are evenly distributed in an annular manner on the inner wall of the valve body 100, and the pin passes through the third connecting hole 530 and the fourth connecting hole 140 at the same time, so that the locking frame 500 is fixedly connected to the valve body 100.

[0051] Furthermore, the annular locking frame 500 includes a plurality of annularly arranged limit assemblies, which are disposed below the slide groove 110. The plurality of limit assemblies are disposed in one-to-one correspondence with the plurality of slide grooves 110. The function of the limit assemblies is to limit the pull rod 400 to the bottom of the slide groove 110 when the valve plate 200 is in the first state, thereby making the second end 230 of the valve plate 200 in a low position so that the safety valve is in an open state.

[0052] In an optional scheme of this embodiment, the limiting assembly includes two longitudinal rods 510 arranged at intervals, and locking pins 520 are respectively provided on the opposite side walls of the two longitudinal rods 510; first positioning holes 440 are provided on both side walls of the pull rod 400; when the two locking pins 520 are clamped in the two first positioning holes 440, the pull rod 400 is locked by the limiting assembly.

[0053] Preferably, the top of the locking pin 520 is configured to be in an arc shape, so that when the valve plate 200 is pushed by the fluid, the valve plate 200 applies an upward pulling force to the pull rod 400 so that the locking pin 520 can disengage from the first positioning hole 440, thereby releasing the limitation of the pull rod 400 by the limit assembly, and the second end 230 of the valve plate 200 moves from a low position to a high position. The second end 230 of each valve plate 200 is arranged to form a ring, and the outer wall of the ring is connected to the inner wall of the valve body 100, and the inner wall of the ring is connected to the outer wall of the drill pipe. A closed space is formed between each valve plate 200, the drill pipe, the valve body 100 and the well wall, thereby closing the annulus.

[0054] In the optional solution of this embodiment, the upper part of the inner wall of the valve body 100 is provided with an internal thread 130, the lower part of the outer wall of the valve body 100 is provided with an external thread 120, the valve body 100 is threadedly connected to the upper casing through the internal thread 130, and the valve body 100 is threadedly connected to the lower casing through the external thread 120. In the drilling operation, the safety of the drilling operation can be enhanced by connecting the annular blowout prevention automatic safety valve between the casings.

[0055] The working process of the annular blowout prevention automatic safety valve under drilling conditions is described as follows:

[0056] When the drilling operation is in a normal state, the annular blowout prevention automatic safety valve is in a first state, that is, the pull rod 400 is under the action of the limit assembly, the distal valve plate end of the pull rod 400 is located at the bottom of the slide groove 110, and the second end 230 of the valve plate 200 is in a low position under the pull of the pull rod 400, and the annular blowout prevention automatic safety valve is in an open state; when a blowout occurs in the well, the valve plate 200 pulls the pull rod 400 under the upward thrust of the fluid, so that the locking pin 520 can be separated from the first positioning hole 440, thereby releasing the limit of the limit assembly on the pull rod 400, and the second end 230 of the valve plate 200 moves from a low position to a high position, and the second ends 230 of each valve plate 200 are arranged to form a ring, the outer wall of the ring is connected to the inner wall of the valve body 100, and the inner wall of the ring is connected to the outer wall of the drill pipe, and a closed space is formed between each valve plate 200, the drill pipe, the valve body 100 and the well wall, thereby closing the annulus. The device has a simple structure and can automatically close the annulus under the driving force of the fluid to prevent the further development of uncontrolled blowout, thereby ensuring drilling safety.

[0057] Embodiment 2

[0058] An annular blowout prevention operation equipment under drilling state includes the annular blowout prevention automatic safety valve under drilling state described in embodiment one.

[0059] In an optional solution of this embodiment, the annular blowout prevention operation equipment also includes upper and lower casings threadedly connected to the annular blowout prevention automatic safety valve.

[0060] Preferably, an internal thread 130 is provided on the upper inner wall of the valve body 100, and the valve body 100 is threadedly connected to the upper casing through the internal thread 130;

[0061] Preferably, an external thread 120 is provided at the lower portion of the outer wall of the valve body 100 , and the valve body 100 is threadably connected to the lower casing via the external thread 120 .

[0062] The working process of the annular blowout prevention equipment under drilling conditions is described as follows:

[0063] When the drilling operation is in a normal state, the annular blowout prevention automatic safety valve is in the first state, that is, the pull rod 400 is under the action of the limit assembly, the far valve plate end of the pull rod 400 is located at the bottom of the slide groove 110, and the second end 230 of the valve plate 200 is in a low position under the pull of the pull rod 400, the annular blowout prevention automatic safety valve is in an open state, and the upper and lower casings are connected to the safety valve;

[0064] When a blowout occurs in the well, the valve plate 200 pulls the pull rod 400 under the upward thrust of the fluid, so that the locking pin 520 can be disengaged from the first positioning hole 440, thereby releasing the limit of the pull rod 400 by the limit assembly, and the second end 230 of the valve plate 200 moves from a low position to a high position. The second ends 230 of each valve plate 200 are arranged to form a ring, and the outer wall of the ring is connected to the inner wall of the valve body 100, and the inner wall of the ring is connected to the outer wall of the drill pipe, thereby closing the annulus and preventing the further development of the uncontrolled blowout. The next step of processing will be carried out after the ground is ready for well pressure to ensure drilling safety.

[0065] The operating equipment can automatically close the annulus under the push of fluid, prevent the further development of uncontrolled blowout, reduce the risk of blowout and uncontrolled blowout, and increase the safety of drilling operations.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An annular blowout prevention automatic safety valve under drilling conditions, characterized in that: It comprises an axially hollow valve body (100) and a plurality of valve plates (200) evenly distributed in an annular shape inside the valve body (100); One end of the valve plate (200) is hinged to the valve body (100), and the other end of the valve plate (200) is arranged as a swing end; An end of the valve plate (200) hinged to the valve body (100) is a first end (210), and the swing end is a second end (230); The valve plate (200) has a first state and a second state, in the first state, the second end (230) of each valve plate (200) is in a low position, in the second state, the second end (230) is in a high position and each second end (230) is arranged to form a circular ring, and the circular ring matches the drill pipe; It also includes a plurality of pull rods (400), wherein the proximal end of the pull rods (400) is hinged to the lower surface of the valve plate (200), and the distal end of the pull rods (400) is slidably connected along the inner wall of the valve body (100); The pull rod (400), the valve plate (200), and the valve body (100) located between the pull rod (400) and the valve plate (200) form a triangular structure.

2. The annular blowout prevention automatic safety valve under drilling state according to claim 1 is characterized in that: The second end (230) is configured as an inwardly concave arc surface, and in the second state, the arc surface of the second end (230) of each valve plate (200) is configured to form a continuous circular ring.

3. The automatic safety valve for preventing annular blowout in drilling state according to claim 1 is characterized in that: The distal end of the pull rod (400) is provided with a sliding shaft (430), the inner wall of the valve body (100) is provided with a sliding groove (110), and the sliding shaft (430) is slidably connected to the sliding groove (110).

4. The automatic safety valve for preventing annular blowout in drilling state according to claim 3 is characterized in that: In the first state, the sliding shaft (430) is located at the bottom of the sliding groove (110), and in the second state, the sliding shaft (430) is located at the top of the sliding groove (110).

5. The automatic safety valve for preventing annular blowout in drilling state according to claim 3 is characterized in that: It also includes an annular fixed shoulder (300), and the first end (210) of the valve plate (200) is connected to the valve body (100) via the fixed shoulder (300).

6. The annular blowout prevention automatic safety valve under drilling state according to claim 5 is characterized in that: It also includes an annular locking frame (500) connected to the valve body (100), the annular locking frame (500) including a plurality of annularly arranged limiting components, the limiting components being arranged below the slide groove (110), the plurality of limiting components being arranged in a one-to-one correspondence with the plurality of slide grooves (110).

7. The automatic safety valve for preventing annular blowout in drilling state according to claim 6 is characterized in that: The limiting assembly comprises two longitudinal rods (510) arranged at an interval, and locking pins (520) are respectively arranged on opposite side walls of the two longitudinal rods (510); First positioning holes (440) are provided on both side walls of the pull rod (400); When the two locking pins (520) are fastened to the two first positioning holes (440), the pull rod (400) is locked by the limiting assembly.

8. The automatic safety valve for preventing annular blowout in drilling state according to claim 1 is characterized in that: The upper portion of the inner wall of the valve body (100) is provided with an internal thread (130), and the lower portion of the outer wall of the valve body (100) is provided with an external thread (120); the valve body (100) is threadedly connected to the upper casing via the internal thread (130), and the valve body (100) is threadedly connected to the lower casing via the external thread (120).

9. An annular blowout prevention device under drilling conditions, characterized in that: It comprises the annular blowout prevention automatic safety valve under drilling state as described in any one of claims 1 to 8.

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