Pitching pressure unlocking, tapping and detonating device

Abstract

The utility model belongs to the field of petroleum and natural gas exploration and development, and particularly relates to a ball throwing pressure unlocking trepanning detonating device which comprises a detonating device body, a cavity is formed in the detonating device body, a shearing ball seat is detachably installed on the upper portion of the inner wall of the detonating device body, a cavity is formed in the shearing ball seat, and the cavity is communicated with the cavity. The upper portion of the cavity is arranged to be in an inner inclined plane shape, and a steel ball is arranged in the cavity and matched with the inner inclined plane of the cavity. And the unlocking supporting seat is in threaded connection to the bottom of the detonating device body, the bottom of the inner wall of the unlocking supporting seat is in threaded connection with an exploder, and an unlocking firing pin is installed on the top of the inner wall of the unlocking supporting seat. According to the utility model, a tubular column and an annular circulation channel which are larger in caliber and smoother are formed before ball injection pressurization, so that pressure difference does not exist between the tubular column and the annular pressure and the tubular column and the annular pressure are in a balanced state, and after ball injection pressurization detonation, the formed tubular column and the annular circulation channel are also beneficial to liquid discharge when the tubular column is lifted.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas exploration and development, in particular to a ball-throwing pressure unlocking hole-opening detonating device. Background Art

[0002] During the perforating operation of oil and gas wells, pressure initiation is a commonly used initiation method. The existing Chinese patent (Announcement No.: CN201120432280) discloses a ball-dropping pressure perforation initiation device for oil and gas wells. The device consists of an upper joint, a firing pin ball, a firing pin plug assembly, a piston sleeve, a shear pin, and a lower joint. The upper and lower joints are threadedly connected, and the firing pin plug and the piston sleeve are connected and limited by the shear pin. The device is connected to the oil casing after being connected through the upper joint hole and the firing pin plug hole. However, the hole diameter and hole density are small, and there is still a pressure difference between the pipe string and the annulus, which will cause pipe string fluctuations and affect accurate initiation. For this reason, we propose a ball-dropping pressure unlocking perforation initiation device. Utility Model Content

[0003] The utility model aims to provide a ball-dropping pressure unlocking hole-opening detonating device, which can form a larger and smoother pipe column and annulus flow channel before ball-dropping pressurization, so that there is no pressure difference between the pipe column and the annulus pressure and they are in a balanced state.

[0004] To this end, the technical solution adopted in this utility model is:

[0005] A ball-throwing pressure unlocking hole detonating device, comprising:

[0006] The detonator body has a cavity formed inside, a shear ball seat is detachably mounted on the upper inner wall of the detonator body, a cavity is disposed inside the shear ball seat, and the upper part of the cavity is configured as an inner slope, a steel ball is disposed inside the cavity, and the steel ball is matched with the inner slope of the cavity;

[0007] An unlocking support seat, wherein the unlocking support seat is threadedly connected to the bottom of the detonating device body, the inner wall bottom of the unlocking support seat is threadedly connected with a detonator, an unlocking striker is installed on the inner wall top of the unlocking support seat, a limiting groove is provided on the outer surface of the unlocking striker, a plurality of limiting balls are circumferentially arranged in the limiting groove, and a through hole adapted to the limiting ball is provided on the side wall of the unlocking support sleeve, and the limiting ball is clamped in the through hole;

[0008] A safety pin is fixed on an unlocking support seat, and the other end of the safety pin is connected to an unlocking impact sleeve. The unlocking impact sleeve is arranged on the outer surface of the unlocking support seat, and a sliding groove adapted to the unlocking impact sleeve is formed between the unlocking support seat and the detonating device body, and an unlocking groove is provided on the outer surface of the unlocking impact sleeve.

[0009] Based on the above technical solution, its use principle and the technical effects produced are as follows:

[0010] The utility model is connected in the perforating pipe string during the perforating operation, the upper end is connected to the oil pipe, and the lower end is connected to the detonator joint and the perforating gun. When the perforating gun string is lowered to the target layer position, a steel ball is put into the wellhead, and the steel ball falls on the inner inclined surface of the upper end of the shear ball seat cavity, and the cavity can be blocked. At this time, the oil pipe and the oil pipe casing annulus are not connected, and then the pump truck pressurizes from the wellhead, and the pressure is transmitted to the steel ball and the shear ball seat, so that the shear ball seat moves downward to cut off the shear pin, and then the shear ball seat continues to move downward and pushes the unlocking impact sleeve to cut off the safety pin, and the unlocking impact sleeve continues to move downward under the pushing action. When the unlocking impact sleeve is on After the unlocking groove moves to the position of the limiting ball, the limiting ball will move into the unlocking groove, thereby disengaging from the limiting groove on the unlocking striker, and the unlocking striker can be released from the limit. At this time, the shear ball seat and the unlocking striker sleeve continue to descend to the bottom. At this time, the liquid inlet hole opened on the unlocking body will open and be connected with the annulus of the oil pipe casing. At this time, the unlocking striker that has been released from the limit will be under the action of the static liquid column pressure in the wellbore, move downward to hit the detonator and ignite the detonator, and detonation can be completed. After the ball is dropped and pressurized to detonate, the liquid inlet hole of the unlocking body is opened and connected with the tubing string, further expanding the tubing string and the annulus channel, which is beneficial to the discharge of liquid when the tubing string is lifted.

[0011] In a preferred example, the utility model can be further configured as follows: the top end of the detonator body is connected to the oil pipe through the oil pipe buckle, and the bottom end is connected to the detonator joint and the perforating gun.

[0012] In a preferred example, the utility model can be further configured as follows: a sealing ring is provided between the shear ball seat and the detonator body, and a liquid inlet hole is provided on the side wall of the detonator body.

[0013] In a preferred example, the utility model can be further configured as follows: a connecting hole is provided on the side wall of the detonator body, and a mounting hole is provided on the side wall of the detonator body, a shear pin is threadedly connected to the mounting hole, and a blind hole matching the shear pin is provided on the side wall of the shear ball seat, and the detonator body and the shear ball seat are detachably installed through the shear pin.

[0014] In a preferred example, the present invention can be further configured as follows: there are multiple shear pins, and the shear pins are evenly distributed around the entire circumference.

[0015] In a preferred example, the utility model can be further configured as follows: a plurality of conducting grooves are provided on the upper inner side surface of the shear ball seat.

[0016] In a preferred example, the present invention can be further configured as follows: a sealing ring is provided between the unlocking striker and the unlocking support seat.

[0017] In a preferred example, the utility model can be further configured as follows: the unlocking impact sleeve is located below the shear ball seat, and the diameter of the unlocking impact sleeve is greater than the diameter of the inner cavity of the shear ball seat.

[0018] The nouns, conjunctions or adjectives involved in the above technical solution are explained as follows:

[0019] Fixed connection refers to a connection in which parts or components are fixed without any relative movement. There are two types of connection: detachable and non-detachable.

[0020] (1) A removable connection is a connection that uses screws, splines, wedge pins, etc. to hold parts together. This type of connection can be disassembled for maintenance without damaging the parts. However, the specifications of the connectors used must be correct (such as the length of the bolts, keys, and wedge pins) and they must be properly tightened.

[0021] (2) Non-detachable connections mainly refer to welding, riveting and tenoning. Since they need to be disassembled by forging, sawing or oxygen cutting for maintenance or replacement, spare parts generally cannot be reused. At the same time, when making connections, attention should be paid to process quality, technical inspection and remedial measures (such as calibration, polishing, etc.);

[0022] An active connection is a connection in which parts or components are fixed so that they can move relative to each other.

[0023] The above technical solution of the utility model has the following beneficial technical effects:

[0024] 1. The technical solution of the utility model forms a larger and smoother pipe string and annulus flow channel before ball dropping and pressurization, so that there is no pressure difference between the pipe string and the annulus pressure, and they are in a balanced state. After the ball dropping and pressurization detonation, the formed pipe string and annulus flow channel is also conducive to the discharge of liquid when the pipe string is lifted.

[0025] 2. The technical solution of the utility model can effectively prevent accidental detonation and mis-perforation caused by excessive instantaneous pressure by shearing a plurality of conducting grooves opened on the ball seat during pressure application.

[0026] 3. The technical solution of the utility model can be applied to highly deviated wells and horizontal wells, has a wide range of applications, and has a simple overall structure. It is easier to assemble in conjunction with tubing conveying perforating operations and continuous tubing pumping perforating operations, thereby facilitating the improvement of the accuracy and reliability of perforating operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a side sectional schematic diagram of the overall structure of the utility model;

[0028] Figure 2 It is a side sectional schematic diagram of the shear ball seat structure of the utility model;

[0029] Figure 3For this utility model Figure 1 Schematic diagram of the cross section at AA in the middle.

[0030] Reference numerals:

[0031] 1. Detonator; 2. Unlocking support seat; 3. Unlocking striker; 4. Safety pin; 5. Limiting ball; 6. Unlocking striker sleeve; 7. Shear ball seat; 8. Detonator body; 9. Steel ball; 10. Sealing ring; 11. Liquid inlet hole; 12. Shear pin; 13. Screw; 14. Connecting hole; 15. Unlocking groove; 16. Conducting groove. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure. It should be noted that the embodiments of the present utility model and the features in the embodiments can be combined with each other without conflict.

[0033] According to the concept of this application, Figures 1 to 3 The following describes an embodiment of a ball-dropping pressure unlocking perforating detonator for pressure detonation during the perforating operation of oil and gas wells. Specifically, the ball-dropping pressure unlocking perforating detonator is constructed as an integrated structure, which has three components: a detonator body 8, an unlocking support seat 2, and a safety pin 4. Before the ball-dropping pressurization, the utility model forms a larger and more unobstructed pipe column and annulus flow channel, so that there is no pressure difference between the pipe column and the annulus pressure, and they are in a balanced state. After the ball-dropping pressurization detonation, the formed pipe column and annulus flow channel is also conducive to the discharge of liquid when the pipe column is lifted.

[0034] Combination Figure 1-3 As shown, the utility model provides a ball-throwing pressure unlocking hole detonating device, comprising:

[0035] The detonator body 8 has a cavity formed inside, a shear ball seat 7 is detachably mounted on the upper inner wall of the detonator body 8, a cavity is formed inside the shear ball seat 7, and the upper inner portion of the cavity is formed in an inner inclined surface, a steel ball 9 is formed inside the cavity, and the steel ball 9 is matched with the inner inclined surface of the cavity;

[0036] An unlocking support seat 2 is threadedly connected to the bottom of the detonating device body 8, and the inner wall bottom of the unlocking support seat 2 is threadedly connected with the detonator 1. An unlocking striker 3 is installed on the inner wall top of the unlocking support seat 2. A limiting groove is provided on the outer surface of the unlocking striker 3, and a plurality of limiting balls 5 are arranged circumferentially in the limiting groove. A through hole matching the limiting ball 5 is provided on the side wall of the unlocking support sleeve, and the limiting ball 5 is clamped in the through hole;

[0037] Safety pin 4, the safety pin 4 is fixed on the unlocking support seat 2, the other end of the safety pin 4 is connected to the unlocking impact sleeve 6, the unlocking impact sleeve 6 is sleeved on the outer surface of the unlocking support seat 2, and a sliding groove adapted to the unlocking impact sleeve 6 is formed between the unlocking support seat 2 and the detonating device body 8, and an unlocking groove 15 is opened on the outer surface of the unlocking impact sleeve 6.

[0038] According to the technical solution of this embodiment, the top of the detonator body 8 is connected to the oil pipe through the oil pipe buckle, and the bottom end is connected to the perforating gun connecting joint. A sealing ring 10 is arranged between the shear ball seat 7 and the detonator body 8, and a liquid inlet hole 11 is opened on the side wall of the detonator body 8. When not working, the liquid inlet hole 11 is in a sealed state, so that the shear pin 12 is under pressure when pressurized.

[0039] According to the technical solution of this embodiment, a connecting hole 14 is provided on the side wall of the detonator body 8, and the oil pipe is connected with the oil casing through the connecting hole 14 before the ball is dropped for pressurization, and a mounting hole is provided on the side wall of the detonator body 8, and a shear pin 12 is threadedly connected in the mounting hole, and a blind hole matching the shear pin 12 is provided on the side wall of the shear ball seat 7, and the shear pin 12 is installed in the mounting hole by a screw 13. The detonator body 8 and the shear ball seat 7 are detachably installed by the shear pin 12. When the steel ball 9 closes the cavity of the shear ball seat 7, pressurization is applied from the wellhead by a pump truck, and the pressure is transmitted to the steel ball 9 and the shear ball seat 7, and the shear ball seat 7 will shear the shear pin 12 downward, thereby continuing to push downward to unlock the impact sleeve 6 under the action of pressure.

[0040] Furthermore, there are multiple shear pins 12, and the shear pins 12 are evenly arranged circumferentially as a whole. The clearance between the shear pins 12 and the blind holes is matched, which is convenient for fixing the shear ball seat 7. When the pressure on the shear ball seat 7 reaches a certain level, the shear pins 12 can be sheared off.

[0041] Furthermore, a plurality of conducting grooves 16 are provided on the upper inner side of the shear ball seat 7. The conducting grooves 16 are used to release part of the pressure, thereby preventing the accidental detonation and perforation caused by excessive instantaneous pressure.

[0042] According to the technical solution of this embodiment, a sealing ring 10 is arranged between the unlocking striker 3 and the unlocking support seat 2. The sealing ring 10 is used to enhance the sealing performance between the unlocking striker 3 and the unlocking support seat 2, thereby preventing oil from entering the interior through the through hole of the unlocking support seat 2 and affecting the downward movement of the unlocking striker 3.

[0043] According to the technical solution of this embodiment, the unlocking impact sleeve 6 is located below the shear ball seat 7, and the diameter of the unlocking impact sleeve 6 is larger than the diameter of the internal cavity of the shear ball seat 7, so that the unlocking striker 3 sleeve can be pushed downward when the shear ball seat 7 moves downward.

[0044] Specifically, during the perforating operation, it is connected in the perforating pipe string, the upper end is connected to the oil pipe, and the lower end is connected to the detonator joint and the perforating gun. When the perforating gun string is lowered to the target layer, a steel ball 9 is dropped at the wellhead, and the steel ball 9 falls on the inner inclined surface of the upper end of the cavity of the shear ball seat 7 to seal the cavity. At this time, the oil pipe is not connected to the annulus of the oil pipe casing, and then the pump truck pressurizes from the wellhead, and the pressure is transmitted to the steel ball 9 and the shear ball seat 7, so that the shear ball seat 7 moves downward to shear the shear pin 12, and then the shear ball seat 7 continues to move downward and pushes the unlocking impact sleeve 6 to shear the safety pin 4. The unlocking impact sleeve 6 continues to move downward under the pushing action. When the unlocking impact sleeve 6 opens After the unlocking groove 15 moves to the position of the limiting ball 5, the limiting ball 5 will move into the unlocking groove 15, thereby disengaging from the limiting groove on the unlocking striker 3, and the unlocking striker 3 can be released from the limit. At this time, the shear ball seat 7 and the unlocking striker sleeve 6 continue to descend to the bottom. At this time, the liquid inlet hole 11 opened on the unlocking body will open and be connected with the annulus of the oil pipe casing. At this time, the unlocking striker 3 that has been released from the limit will be under the action of the static liquid column pressure in the wellbore, move downward to hit the detonator 1 to ignite the detonator 1, and detonation can be completed. After the ball is dropped and pressurized to detonate, the liquid inlet hole 11 of the unlocking body is opened and connected with the pipe string, further expanding the pipe string and the annular space channel, which is beneficial to the discharge of liquid when the pipe string is lifted.

[0045] The following is a further description of a ball-throwing pressure unlocking hole-opening detonating device provided by the utility model in conjunction with the accompanying drawings and implementation modes.

[0046] A ball-throwing pressure unlocking hole detonating device, comprising:

[0047] The detonator body 8 has a cavity formed inside, a shear ball seat 7 is detachably mounted on the upper inner wall of the detonator body 8, a cavity is formed inside the shear ball seat 7, and the upper inner portion of the cavity is formed in an inner inclined surface, a steel ball 9 is formed inside the cavity, and the steel ball 9 is matched with the inner inclined surface of the cavity;

[0048] An unlocking support seat 2 is threadedly connected to the bottom of the detonating device body 8, and the inner wall bottom of the unlocking support seat 2 is threadedly connected with the detonator 1. An unlocking striker 3 is installed on the inner wall top of the unlocking support seat 2. A limiting groove is provided on the outer surface of the unlocking striker 3, and a plurality of limiting balls 5 are arranged circumferentially in the limiting groove. A through hole matching the limiting ball 5 is provided on the side wall of the unlocking support sleeve, and the limiting ball 5 is clamped in the through hole;

[0049] Safety pin 4, the safety pin 4 is fixed on the unlocking support seat 2, the other end of the safety pin 4 is connected to the unlocking impact sleeve 6, the unlocking impact sleeve 6 is sleeved on the outer surface of the unlocking support seat 2, and a sliding groove adapted to the unlocking impact sleeve 6 is formed between the unlocking support seat 2 and the detonating device body 8, and an unlocking groove 15 is opened on the outer surface of the unlocking impact sleeve 6.

[0050] Working principle and use process of the utility model: When performing perforating operation, the utility model is connected in the perforating pipe string, the upper end is connected to the oil pipe, and the lower end is connected to the detonator joint and the perforating gun. When the perforating gun string is lowered to the target layer position, a steel ball 9 is dropped into the wellhead, and the steel ball 9 falls on the inner inclined surface of the upper end of the cavity of the shear ball seat 7, so that the cavity can be blocked. At this time, the oil pipe is not connected to the annulus of the oil pipe casing, and then the pump truck pressurizes from the wellhead, and the pressure is transmitted to the steel ball 9 and the shear ball seat 7, so that the shear ball seat 7 moves downward to shear the shear pin 12, and then the shear ball seat 7 continues to move downward and pushes the unlocking impact sleeve 6 to shear. The safety pin 4 and the unlocking impact sleeve 6 continue to move downward under the pushing action. When the unlocking groove 15 provided on the unlocking impact sleeve 6 moves to the position of the limiting ball 5, the limiting ball 5 will move into the unlocking groove 15, thereby disengaging from the limiting groove on the unlocking striker 3, and the limiting of the unlocking striker 3 can be released. At this time, the shear ball seat 7 and the unlocking impact sleeve 6 continue to descend to the bottom. At this time, the liquid inlet hole 11 provided on the unlocking body will open and be connected with the annulus of the oil pipe casing. At this time, the unlocking striker 3 that has been released from the limit will be under the action of the static liquid column pressure in the wellbore, move downward to hit the detonator 1 to ignite the detonator 1, and detonation can be completed.

[0051] In the present utility model, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The term "and / or" used in this article includes any and all combinations of one or more related listed items. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0052] It should be noted that when an element is referred to as being "assembled on", "installed on", "fixed on" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0053] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate 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 claims and their equivalents.

Claims

1. A ball-throwing pressure unlocking hole detonating device, characterized in that: include: A detonator body (8), wherein a cavity is provided inside the detonator body (8), a shear ball seat (7) is detachably mounted on the upper portion of the inner wall of the detonator body (8), a cavity is provided inside the shear ball seat (7), and the upper portion of the cavity is provided in the shape of an inner inclined surface, a steel ball (9) is provided inside the cavity, and the steel ball (9) is adapted to the inner inclined surface of the cavity; An unlocking support seat (2), the unlocking support seat (2) is threadedly connected to the bottom of the detonating device body (8), the inner wall bottom of the unlocking support seat (2) is threadedly connected to the detonator (1), the inner wall top of the unlocking support seat (2) is equipped with an unlocking striker (3), the outer surface of the unlocking striker (3) is provided with a limiting groove, a plurality of limiting balls (5) are circumferentially arranged in the limiting groove, and a through hole matched with the limiting ball (5) is provided on the side wall of the unlocking support sleeve, and the limiting ball (5) is clamped in the through hole; A safety pin (4) is fixed on an unlocking support seat (2), the other end of the safety pin (4) is connected to an unlocking impact sleeve (6), the unlocking impact sleeve (6) is sleeved on the outer surface of the unlocking support seat (2), and a sliding groove adapted to the unlocking impact sleeve (6) is formed between the unlocking support seat (2) and the detonating device body (8), and an unlocking groove (15) is provided on the outer surface of the unlocking impact sleeve (6).

2. A ball-throwing pressure unlocking and hole-opening detonating device according to claim 1, characterized in that: The top end of the detonator body (8) is connected to the oil pipe via an oil pipe buckle, and the bottom end is connected to the detonator joint and the perforating gun.

3. A ball-throwing pressure unlocking and hole-opening detonating device according to claim 2, characterized in that: A sealing ring (10) is arranged between the shear ball seat (7) and the detonator body (8), and a liquid inlet hole (11) is opened on the side wall of the detonator body (8).

4. A ball-throwing pressure unlocking and hole-opening detonating device according to claim 2, characterized in that: A connecting hole (14) is provided on the side wall of the detonator body (8), and a mounting hole is provided on the side wall of the detonator body (8), a shear pin (12) is threadedly connected in the mounting hole, and a blind hole matching the shear pin (12) is provided on the side wall of the shear ball seat (7), and the detonator body (8) and the shear ball seat (7) are detachably mounted via the shear pin (12).

5. A ball-throwing pressure unlocking and hole-opening detonating device according to claim 4, characterized in that: The shear pins (12) are multiple in number, and the shear pins (12) are evenly arranged in the circumferential direction as a whole.

6. A ball-throwing pressure unlocking and hole-opening detonating device according to claim 5, characterized in that: A plurality of conducting grooves (16) are provided on the upper inner side of the shear ball seat (7).

7. The ball-throwing pressure unlocking and hole-opening detonating device according to claim 5, characterized in that: A sealing ring (10) is provided between the unlocking striker (3) and the unlocking support seat (2).

8. A ball-throwing pressure unlocking and hole-opening detonating device according to claim 7, characterized in that: The unlocking impact sleeve (6) is located below the shearing ball seat (7), and the diameter of the unlocking impact sleeve (6) is greater than the diameter of the internal cavity of the shearing ball seat (7).

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