CN111022004A - Pressure relief safety gun tail and method for cable transmission perforating gun - Google Patents
Pressure relief safety gun tail and method for cable transmission perforating gun Download PDFInfo
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- CN111022004A CN111022004A CN201911377842.8A CN201911377842A CN111022004A CN 111022004 A CN111022004 A CN 111022004A CN 201911377842 A CN201911377842 A CN 201911377842A CN 111022004 A CN111022004 A CN 111022004A
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- 230000001681 protective effect Effects 0.000 claims abstract description 34
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000013016 damping Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000005474 detonation Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
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Abstract
The invention discloses a pressure relief safety gun tail for a cable transmission perforating gun, which belongs to the technical field of oil and gas well testing and mining and is characterized by comprising the following components in parts by weight: the middle part of the gun tail shell is provided with a through hole which extends from one end of the gun tail shell to the other end; the piston is connected with the through hole in a sealing and sliding mode along the direction from one end of the through hole to the other end of the through hole; one end of the pressure relief hole is positioned outside the gun tail shell, and the other end of the pressure relief hole is positioned in the through hole of the gun tail shell; a detonator protective sheath; tail sealing; a connecting portion; the invention provides a pressure relief safety gun tail for a cable transmission perforating gun, which has a pressure relief function under the condition of abnormal perforation caused by only detonator detonation, introduces well liquid into the perforating gun to achieve balance of internal and external pressures, and avoids dangerous accidents caused by high pressure in the gun during disassembly.
Description
Technical Field
The invention belongs to the technical field of oil and gas well testing and exploitation, and particularly relates to a pressure relief safety gun tail for a cable transmission perforating gun and a method.
Background
The perforation is the 'next to the door' of oil and gas field exploitation, and is an important technical means of oil and gas field exploitation. After the perforating gun is normally detonated underground, the perforating bullet pierces the perforating gun, the casing, the cement sheath and the rock stratum to form an oil outlet hole. The oil and gas reach the shaft through the holes under the action of the pressure of the ground, and are produced to the ground.
After the perforating gun is normally perforated, holes are formed on the perforating gun body and are communicated with the pressure inside and outside the gun. So there is no problem with the disassembly of the gun after the well is tripped.
In the process of implementing the embodiment of the invention, the inventor finds that at least the following defects exist in the background art:
when the perforating gun is not normally detonated, the phenomenon that although a detonator is detonated, a detonating cord detonates, the perforating bullet cannot be detonated, or the perforating bullet is also burnt without perforation, the increased pressure in the gun cannot be released, and when the perforating gun is disassembled after being lifted out of the well, the accident that a connector falls off and a person is injured can be easily caused.
Disclosure of Invention
The invention aims to provide a pressure relief safety gun tail for a cable transmission perforating gun and a method, which are used for replacing the common gun tail commonly used at present. The problem that when the perforating gun is not normally detonated, the detonators detonate but the detonating cord detonates, so that perforating bullets cannot be detonated, or the perforating bullets are burnt and do not have perforations, the increased pressure in the gun cannot be released, and the joint is easy to fall off to hurt people when the perforating gun is disassembled after being lifted up from a well is solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a pressure relief safety gun tail for a cable transmission perforating gun, comprising:
the middle part of the gun tail shell is provided with a through hole which extends from one end of the gun tail shell to the other end;
the piston is connected with the through hole in a sealing and sliding mode along the direction from one end of the through hole to the other end of the through hole;
one end of the pressure relief hole is positioned outside the gun tail shell, and the other end of the pressure relief hole is positioned in the through hole of the gun tail shell;
a detonator protective sheath;
tail sealing;
a connecting portion;
the side of gun tail shell one end has the connecting portion that is used for being connected with the perforating gun, the gun tail shell other end the through-hole drill way is sealed through the tail, detonator protective sheath and piston are located in the through-hole, detonator protective sheath one end is located connecting portion one side of gun tail shell, the piston is located the other end of detonator protective sheath, has the clearance between piston and the tail seal, the piston has primary importance and second place, when the piston is located primary importance, pressure release hole one end is connected with the lateral wall of piston, when the piston is located the second place, the pressure release hole with the through-hole intercommunication.
The through hole comprises a first through hole, a second through hole and a third through hole which are communicated with each other, the detonator protective sleeve is positioned in the first through hole, the piston is positioned in the second through hole, and the length of the third through hole is greater than that of the piston.
The inner diameter of the third through hole is larger than that of the second through hole.
The tail seal face that the through-hole is just right has the shrinkage pool, the axis of shrinkage pool is not placed in the middle.
The concave hole is a conical concave hole, and the central axis of the conical concave hole is not on the central axis of the through hole.
One end of the piston is in an asymmetric shape, and one end of the piston in the asymmetric shape is opposite to the tail seal.
And a sealing ring is arranged between the piston and the wall of the through hole in the gun tail shell, and the piston is connected with the gun tail shell in a sealing way through the sealing ring.
The detonator protective sleeve is communicated with the outer side of the detonator protective sleeve through the detonating cord through hole of the connecting piece.
The connecting piece is also provided with a positioning ring, the middle part of the positioning ring is provided with a fourth through hole, one end of the connecting piece extends into the fourth through hole, and the other end of the connecting piece extends into the detonator protective sleeve;
one end of the connecting piece is in threaded connection with the positioning ring, and the other end of the connecting piece is in threaded connection with the detonator protective sleeve.
And a fifth through hole which is positioned at the end part of the gun tail shell and is matched with the connecting piece in shape, and the connecting piece is embedded in the fifth through hole.
A method of cable-conveyed perforating gun pressure relief, comprising:
communicating the detonator chamber with the inner cavity of the perforating gun by using a damping hole;
a piston cavity with a pressure relief hole in the radial direction is formed outside the detonator chamber, and the piston cavity is communicated with the detonator chamber, wherein the pressure relief hole is a hole for communicating the piston cavity with the outside;
the piston is arranged at a pressure relief hole in the piston cavity, the outside is blocked from the detonator chamber by the piston, and the length of the piston is shorter than the distance from the pressure relief hole in the piston cavity to the bottom of the piston cavity.
The pressure relief safety gun tail for the cable transmission perforating gun has the advantages that the pressure relief safety gun tail for the cable transmission perforating gun is provided, the pressure relief function is provided under the abnormal perforating condition that only the detonator is detonated, well liquid is introduced into the perforating gun, the internal pressure and the external pressure are balanced, and the dangerous accident caused by high pressure in the gun during disassembly is avoided.
Drawings
Fig. 1 is a schematic overall structure diagram of a pressure relief safety gun tail for a cable transmission perforating gun according to the invention.
Labeled as: 1. a perforating gun; 2. a cartridge frame; 3. a positioning ring; 4. a connecting member; 5. a gun tail housing; 6. a detonator protective sheath; 7. a piston; 8. tail sealing; 9. a pressure relief vent.
Detailed Description
The pressure relief safety tail scheme for a perforating gun provided by the embodiment of the invention is described in detail by using several specific embodiments.
Example 1
Referring to fig. 1, there is shown an overall structure diagram of a pressure relief safety tail for a cable transmission perforating gun, which includes:
the gun tail shell 5 is provided with a through hole in the middle, and the through hole is from one end of the gun tail shell 5 to the other end;
the piston 7 is connected with the through hole in a sealing and sliding mode along the direction from one end of the through hole to the other end of the through hole;
one end of the pressure relief hole 9 is positioned outside the gun tail shell 5, and the other end of the pressure relief hole 9 is positioned in the through hole of the gun tail shell 5;
a detonator protective sheath 6;
tail seal 8;
a connecting portion;
the side of 5 one ends of gun tail shell has the connecting portion that is used for being connected with the perforating gun, 5 other ends of gun tail shell the through-hole drill way is sealed through tail seal 8, detonator protective sheath 6 and piston 7 are located in the through-hole, detonator protective sheath 6 one end is located connecting portion one side of 5 of gun tail shell, piston 7 is located the other end of detonator protective sheath 6, piston 7 and tail seal 8 have the clearance between, piston 7 has primary importance and second place, when piston 7 is located the primary importance, 9 one end of pressure release hole are connected with the lateral wall of piston 7, when piston 7 is located the second place, pressure release hole 9 with the through-hole intercommunication.
In the above embodiment, in order to avoid the problem that the detonating cord detonates although the detonator detonators when the perforating gun 1 is not detonated normally, the perforating bullet cannot be detonated, or the perforating bullet is also burnt, and the pressure in the gun cannot be released, the gun tail connected to the tail part of the perforating gun 1 is re-improved, the space inside the gun tail is expanded, the piston 7 is additionally arranged inside the gun tail, the communication between the gun tail and the outside is controlled through the piston 7, and the mode that the piston 7 is controlled to be communicated with the outside is that the plurality of pressure relief holes 9 are formed in the side wall of the gun tail shell 5.
In the normal state, the piston 7 blocks the pressure relief hole 9, and after the detonator in the detonator protective sleeve 6 is detonated, the piston 7 can be pushed out towards the other side by the pushing force of the detonator, the piston 7 does not block the pressure relief hole 9 at the moment, the pressure relief hole 9 can be communicated with the inside of the gun tail shell 5, and the further pressure relief hole 9 is communicated with the inside of the perforating gun 1. In order to facilitate the piston 7 to be pushed to the other side after the detonator is exploded and further to communicate the pressure relief hole 9 with the inside of the perforating gun 1, a certain gap is reserved between the piston 7 and the tail seal 8, so that the pressure relief hole 9 is communicated with the inside of the gun tail shell 5 when the piston 7 is pushed to the gap.
Through the structure of the embodiment, when the perforating gun 1 is not detonated normally, as long as the detonator detonators, the interior of the gun can be communicated with the exterior.
Example 2
Further, referring to fig. 1, according to another embodiment of the pressure relief safety gun tail for a cable transmission perforating gun of the present invention, the through hole includes a first through hole, a second through hole and a third through hole which are communicated with each other, the detonator protective sheath 6 is located in the first through hole, the piston 7 is located in the second through hole, and the length of the third through hole is greater than the length of the piston 7.
In the above embodiment, the through hole inside the breech housing 5 may be divided into three areas, namely, a first through hole, a second through hole and a third through hole which are sequentially communicated, wherein the first through hole is mainly used for arranging the detonator protective sleeve 6, the detonator protective sleeve 6 is used for installing a detonator, the second through hole is used for arranging the piston 7, the pressure relief hole 9 is arranged between the inside of the second through hole and the outside of the breech housing 5, and the third through hole is mainly used for providing a movable space for the piston 7, so that a part or all of the piston 7 can be moved into the third through hole, and after the piston 7 is moved into the third through hole, the pressure relief hole 9 is communicated with the inside of the breech housing.
Example 3
Further, referring to fig. 1, in another embodiment of the pressure relief safety gun tail for a cable transmission perforating gun according to the present invention, an inner diameter of the third through hole is larger than an inner diameter of the second through hole.
In the above embodiment, because the detonator is exploded, the impact force is large, in order to prevent the piston 7 from being pushed and collided at the tail seal 8 and then rebounded, and further to block the pressure relief hole 9, the inner diameter of the third through hole is larger than that of the second through hole, after the piston 7 enters the third through hole, the piston can be blocked by the step between the third through hole and the second through hole, and it is ensured that the pressure relief hole 9 cannot be blocked by the piston 7 again after the detonator is exploded.
Example 4
Further, according to another embodiment of the pressure relief safety gun tail for the cable transmission perforating gun, a concave hole is formed in one surface, opposite to the tail seal 8, of the through hole, and the central axis of the concave hole is not centered.
In the above embodiment, the inventor found that, in the process of specific implementation, because the impact force of the detonator is relatively large, even if the inner diameter of the third through hole is larger than that of the second through hole, when the piston 7 is bounced onto the tail seal 8, the piston 7 travels into the third through hole from the second through hole, and is still bounced back into the second through hole again, so that one surface of the tail seal 8 opposite to the through hole is provided with a concave hole with an off-centered central axis, the concave hole can form an effect similar to an inclined plane at the bottom of the tail seal, and when the piston 7 is bounced back again by contacting the tail seal 8, the piston 7 cannot bounce on the original way due to the action of the inclined plane, and can bounce off upwards or downwards and can be left in the third through hole.
Furthermore, one surface of the tail seal opposite to the through hole is an inclined surface, and the surface of the tail seal 8 opposite to the piston 7 is not parallel.
Example 5
Further, referring to fig. 1, according to another embodiment of the pressure relief safety gun tail for a cable transmission perforating gun of the present invention, the concave hole is a conical concave hole, and a central axis of the conical concave hole is not on a central axis of the through hole.
In the above embodiment, the concave hole is changed into the conical concave hole which is not overlapped with the central axis of the through hole, so that the machining difficulty is lower on the premise that the rebound path of the piston 7 can be changed, and the manufacturing and production are convenient.
Example 6
Further, referring to fig. 1, in another embodiment of the pressure relief safety gun tail for a cable transmission perforating gun according to the present invention, one end of the piston 7 is asymmetric, and one end of the piston 7 with the asymmetric shape is opposite to the tail seal 8.
In the above embodiment, while solving the problem that the piston 7 will rebound back to the original path after hitting the tail seal 8, another solution is to change the shape of the piston 7, so that even if the piston hits the plane or the symmetrical plane, the piston 7 will depend on its own irregular surface, and when hitting the tail seal 8, it will deviate from the original path, so that the piston 7 is left in the third through hole. The effect of keeping the pressure relief safety gun tail for the perforating gun to work stably is achieved.
Example 7
Further, referring to fig. 1, in another embodiment of the pressure relief safety gun tail for a cable-conveying perforating gun according to the present invention, a sealing ring is disposed between the piston 7 and a wall of a through hole in the gun tail housing 5, and the piston 7 is connected to the gun tail housing 5 in a sealing manner through the sealing ring.
In the above embodiment, in order to ensure that the pressure relief hole 9 is disconnected from the inside of the gun tail housing 5 when the detonator is not detonated, a sealing ring is additionally arranged between the piston 7 and the wall of the through hole in the gun tail housing 5, and the sealing ring is positioned on two sides of the pressure relief hole 9 to seal the pressure relief hole 9. The working stability of the pressure relief safety gun tail for the perforating gun is ensured.
4 sealing rings are arranged on the piston and are distributed on two sides of 4 pressure relief holes 9 after being installed, when the detonator is detonated, the detonation pressure pushes the piston to move and fly into the tail seal 8, and the bottom of the tail seal 8 is an inclined plane formed by offset conical holes, so that the piston cannot return according to the original route even after being impacted and can be clamped in the tail seal. Thus, the pressure relief hole is exposed, and well fluid enters the perforating gun through the pressure relief hole, so that the pressure balance between the shaft and the pressure in the gun is achieved.
Example 8
Further, referring to fig. 1, in another embodiment of the pressure relief safety gun tail for a cable-conveying perforating gun according to the present invention, a connecting member 4 is provided outside the gun tail housing 5, a detonating cord passing hole smaller than the diameter of the inner hole of the detonator protection sleeve 6 is provided in the middle of the connecting member 4, the connecting member 4 is provided at the end of the gun tail housing 5 at one end of the connecting member, and the detonator protection sleeve 6 is communicated with the outside thereof through the detonating cord passing hole of the connecting member 4.
In the above embodiment, in order to ensure that the main impact force of the detonator can be concentrated on the piston 7 when the detonator explodes, the connecting piece 4 is additionally arranged between the detonator protective sleeve 6 and the connection part of the perforating gun, and the middle part of the connecting piece 4 is provided with the detonating cord through hole, so that the detonating cord ignited by the detonator can be ensured to be correctly connected with the perforating bullet in the perforating gun, and the detonator explosion pressure in the detonator protective sleeve 6 can be ensured to be concentrated on the piston 7, so that the piston 7 can be normally pushed out.
Example 9
Further, referring to fig. 1, in another embodiment of the pressure relief safety gun tail for the cable transmission perforating gun according to the present invention, a positioning ring 3 is further disposed outside the connecting member 4, a fourth through hole is disposed in the middle of the positioning ring 3, one end of the connecting member 4 extends into the fourth through hole, and the other end of the connecting member 4 extends into the detonator protection sleeve 6;
in the above embodiment, the positioning ring 3 is stably connected with the detonator protective sleeve 6 through the connecting piece 4, so that the stability of the detonator protective sleeve 6 relative to the perforating gun can be ensured.
Further, referring to fig. 1, in another embodiment of the pressure relief safety gun tail for the cable transmission perforating gun according to the present invention, one end of the connecting member 4 is in threaded connection with the positioning ring 3, and the other end of the connecting member 4 is in threaded connection with the detonator protective sleeve 6.
In the above embodiment, 4 one ends of connecting piece and 3 threaded connection of holding ring, 4 other ends of connecting piece and 6 threaded connection of detonator protective sheath make it simple and efficient more when installation and dismantlement, make things convenient for operating personnel to be under construction.
Example 10
Further, referring to fig. 1, another embodiment of the pressure relief safety gun tail for a cable transmission perforating gun according to the present invention is that a fifth through hole matching with the shape of the connecting piece 4 is formed at the end of the gun tail housing 5, and the connecting piece 4 is embedded in the fifth through hole.
In the above embodiment, in order to make the device more compact, a fifth through hole is provided at the end of the breech housing 5 for receiving the connecting member 4, and the connecting member 4 is provided in the fifth through hole.
Preferably, the method is used for cable transmission perforation, and the purpose of the method is to prevent the potential disassembly safety hazard caused by abnormal detonation.
Example 11
A method of cable-conveyed perforating gun pressure relief, comprising:
communicating the detonator chamber with the inner cavity of the perforating gun by using a damping hole;
a piston cavity with a pressure relief hole in the radial direction is formed outside the detonator chamber, and the piston cavity is communicated with the detonator chamber, wherein the pressure relief hole is a hole for communicating the piston cavity with the outside;
the piston is arranged at a pressure relief hole in the piston cavity, the outside is blocked from the detonator chamber by the piston, and the length of the piston is shorter than the distance from the pressure relief hole in the piston cavity to the bottom of the piston cavity.
In the above embodiment, in order to avoid the problem that the detonating cord detonates although the detonator detonators when the perforating gun 1 is not detonated normally, and the perforating bullet cannot be detonated, or the perforating bullet is also combusted, and the pressure in the gun cannot be released, the gun tail connected to the tail part of the perforating gun 1 is re-improved in design, a piston cavity is arranged outside the detonator cavity, the piston cavity is provided with a pressure release hole, the pressure release hole in the piston cavity is controlled by a piston in the piston cavity, and the pressure release hole is controlled to be opened and closed.
The detonator room uses the damping hole to communicate with the inner cavity of the perforating gun, excessive pressure generated when the detonator in the detonator room explodes can be prevented from being discharged into the inner cavity of the perforating gun, energy generated when the detonator explodes can be concentrated in the piston cavity, the detonator can push the piston to move to the other side when exploding, and finally the piston is pushed to move, so that the piston blocking the pressure relief hole in the radial direction pushes the other side, and then the outside and the detonator room are communicated, as long as the detonator explodes, the perforating gun 1 is provided with or not provided with a perforation, and the outside pressure can be introduced into the perforating gun. By the method of the embodiment, when the perforating gun 1 is not detonated normally, as long as the detonator detonators detonate, the interior of the gun is communicated with the exterior.
It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in the present embodiment are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.
In addition, descriptions related to "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Technical solutions between various embodiments may be combined with each other, but must be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Claims (10)
1. The utility model provides a cable transmission is pressure release safety gun tail for perforating gun which characterized in that includes:
the gun tail shell (5), the middle part of the gun tail shell (5) is provided with a through hole, and the through hole is from one end of the gun tail shell (5) to the other end;
the piston (7) is connected with the through hole in a sealing and sliding mode along the direction from one end to the other end of the through hole;
one end of the pressure relief hole (9) is positioned outside the gun tail shell (5), and the other end of the pressure relief hole (9) is positioned in a through hole of the gun tail shell (5);
a detonator protective sheath (6);
a tail seal (8);
a connecting portion;
the side of gun tail shell (5) one end has the connecting portion that are used for being connected with the perforating gun, the through-hole drill way of the gun tail shell (5) other end is sealed through tail seal (8), detonator protective sheath (6) and piston (7) are located in the through-hole, detonator protective sheath (6) one end is located connecting portion one side of gun tail shell (5), piston (7) are located the other end of detonator protective sheath (6), have the clearance between piston (7) and tail seal (8), piston (7) have primary importance and second place, when piston (7) are located the primary importance, pressure release hole (9) one end is connected with the lateral wall of piston (7), when piston (7) are located the second place, pressure release hole (9) with the through-hole intercommunication.
2. The pressure relief safety tail for a cable-fed perforating gun as claimed in claim 1, characterized in that the through-hole comprises a first through-hole, a second through-hole and a third through-hole which are interconnected, the detonator protective sheath (6) being located in the first through-hole, the piston (7) being located in the second through-hole, and the length of the third through-hole being greater than the length of the piston (7).
3. The pressure relief safety tail for a cable-conveyed perforating gun of claim 2, wherein the third bore has an inside diameter greater than the inside diameter of the second bore.
4. The pressure relief safety gun tail for a cable transmission perforating gun as claimed in claim 2, characterized in that a concave hole is formed on one side of the tail seal (8) opposite to the through hole, and the central axis of the concave hole is not centered; or
One end of the piston (7) is in an asymmetric shape, and one end of the piston (7) in the asymmetric shape is opposite to the tail seal (8).
5. The pressure relief safety gun tail for a cable transmission perforating gun as recited in claim 4, wherein the recess is a conical recess, and a central axis of the conical recess is not on a central axis of the through hole.
6. The pressure relief safety gun tail for the cable transmission perforating gun as claimed in claim 1, characterized in that a sealing ring is arranged between the piston (7) and the wall of the through hole in the gun tail housing (5), and the piston (7) is connected with the gun tail housing (5) in a sealing way through the sealing ring.
7. The pressure relief safety breech for a cable transfer perforating gun as claimed in claim 1, characterized in that the breech housing (5) is externally provided with a connecting piece (4), the middle part of the connecting piece (4) is provided with a detonating cord passing hole smaller than the diameter of the inner hole of the detonator protective sleeve (6), the connecting piece (4) is positioned at the end part of the breech housing (5) at one end of the connecting part, and the detonator protective sleeve (6) is communicated with the outer side thereof through the detonating cord passing hole of the connecting piece (4).
8. The pressure relief safety gun tail for the cable transmission perforating gun as claimed in claim 3, characterized in that the connecting piece (4) is provided with a positioning ring (3), the middle part of the positioning ring (3) is provided with a fourth through hole, one end of the connecting piece (4) extends into the fourth through hole, and the other end of the connecting piece (4) extends into the detonator protective sleeve (6);
one end of the connecting piece (4) is in threaded connection with the positioning ring (3), and the other end of the connecting piece (4) is in threaded connection with the detonator protective sleeve (6).
9. The pressure relief safety gun tail for a cable-conveyed perforating gun as claimed in claim 3, characterized in that the end of the tail housing (5) has a fifth through hole matching the shape of the connecting piece (4), and the connecting piece (4) is embedded in the fifth through hole.
10. A method for relieving pressure of a cable transmission perforating gun is characterized by comprising the following steps:
communicating the detonator chamber with the inner cavity of the perforating gun by using a damping hole;
a piston cavity with a pressure relief hole in the radial direction is formed outside the detonator chamber, and the piston cavity is communicated with the detonator chamber, wherein the pressure relief hole is a hole for communicating the piston cavity with the outside;
the piston is arranged at a pressure relief hole in the piston cavity, the outside is blocked from the detonator chamber by the piston, and the length of the piston is shorter than the distance from the pressure relief hole in the piston cavity to the bottom of the piston cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911377842.8A CN111022004A (en) | 2019-12-27 | 2019-12-27 | Pressure relief safety gun tail and method for cable transmission perforating gun |
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| CN201911377842.8A CN111022004A (en) | 2019-12-27 | 2019-12-27 | Pressure relief safety gun tail and method for cable transmission perforating gun |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112727412A (en) * | 2021-01-10 | 2021-04-30 | 大庆金祥寓科技有限公司 | Environment-friendly well fluid discharging device for dynamic negative pressure perforation |
| CN113550723A (en) * | 2020-04-23 | 2021-10-26 | 中国石油天然气股份有限公司 | Pressure relief device and perforating gun |
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2019
- 2019-12-27 CN CN201911377842.8A patent/CN111022004A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113550723A (en) * | 2020-04-23 | 2021-10-26 | 中国石油天然气股份有限公司 | Pressure relief device and perforating gun |
| CN113550723B (en) * | 2020-04-23 | 2023-12-22 | 中国石油天然气股份有限公司 | Pressure relief device and perforating gun |
| CN112727412A (en) * | 2021-01-10 | 2021-04-30 | 大庆金祥寓科技有限公司 | Environment-friendly well fluid discharging device for dynamic negative pressure perforation |
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