Infinite patching well oil pipe conveying perforation interlayer explosion propagation device and method

Abstract

The invention relates to the technical field of oil and gas well perforation, in particular to an infinite patching well oil pipe conveying perforation interlayer explosion propagation device and method. The device comprises an upper-stage perforating gun, the lower end of the upper-stage perforating gun is connected with a pressure generator, the pressure generator is connected with a coupling mechanism, the coupling mechanism comprises a first aperture coupling, a second aperture coupling and an input coupling, the upper end of the first aperture coupling is connected with the pressure generator, and the lower end of the second aperture coupling is connected with the input coupling. An interlayer oil pipe is installed between the first aperture coupling and the second aperture coupling, the second aperture coupling is connected with an input coupling, the inner side of the input coupling is a pressure trepanning upper main body, the lower end of the pressure trepanning upper main body is a pressure trepanning lower main body, and the pressure trepanning lower main body is connected with a lower-stage perforating gun through a gun connecting joint. According to the explosion propagation device and method provided by the invention, the explosion propagation problems that the stratum of the patching well is opened, and multiple interlayers and large section distances exist are solved, on the basis of safety, the interlayer explosion propagation device is simplified, and multi-stage perforation of the large-span multi-section patching well is completed at a time.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas well perforation, and in particular to an infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device and method. Background Art

[0002] The situation in the wellbore of the plugging well is complicated, with the characteristics of scaling, wax deposition, and dead oil, and cable transmission perforation is no longer suitable. Part of the formation in the plugging well has been opened, and the formation and casing are already connected. When the tubing is used for perforating, a pressure space cannot be established in the annulus of the oil casing, and the wellbore needs to be pressurized for negative pressure perforating. When pressurizing, the wellbore pressure fluid easily enters the formation, which may cause formation contamination. At the same time, since it is impossible to complete long-span perforation in the plugging well at one time, the consumption of the interlayer gun is large, resulting in large-span multi-well section plugging wells, especially horizontal well plugging, cannot be perforated by a single pressure detonation, and can only be perforated in batches according to the perforating well section, which has high construction costs.

[0003] Regarding the interlayer pressurized explosion transmission device, Chinese patent application number "201610953223.9" discloses a high-temperature pressurized device for oil and gas well interlayer explosion transmission, the application date is November 3, 2016, and the authorization announcement date is February 8, 2017. The joint of this device is fixedly connected with the body by thread, the partition ignition assembly is placed in the joint through hole, the gunpowder assembly and the piston assembly are respectively placed on both sides of the body combustion chamber, the pressure relief valve is placed on the side of the body combustion chamber, the body and the first coupling are fixedly connected by oil pipe threads, and a certain number of oil pipes are used to connect the first coupling, the second coupling and the third coupling. Its main problems are: 1. The piston assembly is long, which greatly increases the friction during the movement and consumes too much detonation energy; 2. Only the long-distance perforation is considered, and the multi-stage perforation in the case of multiple interlayers is not emphasized; 3. A certain number of oil pipes are connected by a three-stage coupling, and the long-distance pressure transmission is very likely to cause transmission energy loss, resulting in the inability to complete the detonation of the lower-level pressure initiator. Therefore, in view of the above shortcomings, the present invention provides an infinite-stage well perforation well oil pipe conveying perforation interlayer explosion transmission device and method. Summary of the invention

[0004] 1. Technical issues to be resolved: The present invention provides an infinite-stage perforation well oil pipe-transmitted perforation interlayer explosion transmission device and method, so as to overcome the problem that large-span perforation cannot be completed in one time in the perforation well, the consumption of the interlayer gun is large, resulting in large-span multi-well section perforation wells, especially horizontal well perforation, cannot be perforated by one-time pressure initiation, and can only be perforated in batches according to the perforation well section, resulting in high construction cost.

[0005] (II) Technical solution: In order to solve the above technical problems, the present invention provides an infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device, comprising: An upper-level perforating gun, wherein the lower end of the upper-level perforating gun is connected to a pressure generator, and the pressure generator is connected to a coupling mechanism, and the coupling mechanism comprises a first aperture coupling, a second aperture coupling and an input coupling, wherein the upper end of the first aperture coupling is connected to the pressure generator, and an interlayer oil pipe is installed between the first aperture coupling and the second aperture coupling, and the aperture of the first aperture coupling is smaller than that of the second aperture coupling, and the second aperture coupling is connected to the input coupling, and the inner side of the input coupling is a pressure opening upper body, and the lower end of the pressure opening upper body is a pressure opening lower body, and the pressure opening lower body is connected to the lower-level perforating gun through a gun connecting joint; The pressure generator comprises a pressure generator joint, a pressure generator body and a pressure generator piston assembly. The upper end of the pressure generator joint is connected to an upper-stage perforating gun, the lower end of the pressure generator joint is connected to the pressure generator body, the lower end of the pressure generator body is connected to a first aperture coupling, and the pressure generator piston assembly is installed inside the pressure generator body.

[0006] Preferably, an inner cavity is provided inside the pressure generator joint, a partition igniter is installed in the inner cavity, a conical plug is installed at the lower end of the pressure generator joint, and the conical plug is connected to the pressure generator body.

[0007] Preferably, the pressure generator body is provided with three cavities inside, namely a first cavity, a second cavity and a third cavity. The propellant cartridge is installed inside the first cavity, the second cavity is a combustion chamber, and the pressure generator piston assembly is installed in the third cavity.

[0008] Preferably, the pressure generator piston assembly comprises a piston sleeve, a piston and a pin, the piston is mounted to the piston sleeve via the pin, the piston sleeve is connected to the pressure generator body via threads, and a double-layer sealing ring is provided at the lower end of the piston sleeve.

[0009] Preferably, the first aperture coupling is provided with an air outlet, and threads are provided on both inner and outer sides of the first aperture coupling. The first aperture coupling is connected to the pressure generator body via internal threads, and is connected to the sandwich oil pipe via external threads.

[0010] Preferably, a liquid inlet hole is provided on the second aperture coupling, threads are provided on both the inner and outer sides of the second aperture coupling, the second aperture coupling is connected to the sandwich oil pipe via the internal threads, and the liquid inlet hole is provided with a rubber plug.

[0011] Preferably, the input coupling is provided with threads inside, the upper end of the input coupling is connected to the external threads of the second aperture coupling through internal threads, and the lower end of the input coupling is connected to the upper body of the pressure opening.

[0012] Preferably, the length of the sandwich oil pipe is determined according to the thickness of the sandwich layer.

[0013] The present invention also provides an operation method based on the infinite-stage well oil pipe conveying perforation interlayer explosion transmission device, comprising: the infinite-stage explosion transmission perforation operation is provided with multiple interlayer explosion transmission devices, and perforating guns are arranged between adjacent interlayer explosion transmission devices.

[0014] (III) Beneficial effects: The invention provides an infinite-stage perforation well oil pipe-transmitted perforation interlayer explosion transmission device and method, which solves the explosion transmission problem of perforation wells with opened formations, multiple interlayers and large section distances. On the basis of safety, the interlayer explosion transmission device is further simplified, the reliability of construction is improved, and multi-stage perforation is completed at one time in perforation wells with large spans and multiple sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a pressure generator connected in series with a first aperture collar according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a second aperture coupling according to an embodiment of the present invention; Figure 4 It is a schematic structural diagram of a piston assembly of a pressure generator according to an embodiment of the present invention.

[0016] Among them, 1-upper level perforating gun; 2-pressure generator joint; 3-pressure generator body; 4-first aperture coupling; 5-interlayer oil pipe; 6-second aperture coupling; 7-input coupling; 8-pressure opening upper body; 9-pressure opening lower body; 10-gun joint; 11-lower level perforating gun; 12-diaphragm igniter; 13-conical plug; 14-propellant cartridge; 15-pressure generator piston assembly; 16-air outlet; 17-liquid inlet; 18-piston sleeve; 19-piston; 20 pin. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by "left", "right", "up", "down", "inside" and "outside" are all based on the directions or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0019] Figure 1 Schematic diagram of the structure of the infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to an embodiment of the present invention. Figure 1 As shown, the present invention provides an infinite-stage perforating well oil pipe conveying perforation interlayer explosion transmission device, including an upper-level perforating gun 1, the lower end of the upper-level perforating gun 1 is connected to a pressure generator, the pressure generator is connected to a coupling mechanism, the coupling mechanism includes a first aperture coupling 4, a second aperture coupling 6 and an input coupling 7, the upper end of the first aperture coupling 4 is connected to the pressure generator, an interlayer oil pipe 5 is installed between the first aperture coupling 4 and the second aperture coupling 6, the second aperture coupling 6 is connected to the input coupling 7, the inner side of the input coupling 7 is a pressure opening upper body 8, the lower end of the pressure opening upper body 8 is a pressure opening lower body 9, and the pressure opening lower body 9 is connected to a lower-level perforating gun 11 through a gun connector 10.

[0020] In actual application, the pressure generator includes a pressure generator joint 2, a pressure generator body 3 and a pressure generator piston assembly 15. The upper end of the pressure generator joint 1 is connected to the upper perforating gun 1, the lower end of the pressure generator joint 2 is connected to the pressure generator body 3, the lower end of the pressure generator body 3 is connected to the first aperture coupling 4, and the pressure generator piston assembly 15 is installed inside the pressure generator body 3.

[0021] Figure 2 FIG. 1 is a schematic diagram of a structure of a pressure generator connected in series with a first aperture coupling according to an embodiment of the present invention. Figure 2 As shown, one end of the pressure generator is connected to the first aperture coupling 4. In the present explosive transmission device, an inner cavity is provided inside the pressure generator joint 2, and a partition igniter 12 is installed in the inner cavity. A conical plug 13 is installed at the lower end of the pressure generator joint 2, and the conical plug 13 is connected to the pressure generator body 3. The pressure generator body 3 is provided with three cavities inside, namely the first cavity, the second cavity and the third cavity. A propellant box 14 is installed inside the first cavity, the second cavity is a combustion chamber, and a pressure generator piston assembly 15 is installed in the third cavity.

[0022] In actual application, the conical plug 13 allows the detonation energy generated by the partition igniter 12 to be gathered at the conical mouth, generating a concentrated airflow along the axial direction, and quickly impacting the propellant box 14, thereby igniting the propellant box 14. The combustion chamber causes the propellant box 14 to fully burn to generate high-temperature and high-pressure gas, causing the propellant box 14 to deflagrate and generate high-temperature and high-pressure gas energy.

[0023] It should be noted that Figure 4 FIG. 1 is a schematic diagram of the structure of a piston assembly of a pressure generator according to an embodiment of the present invention. Figure 4As shown, the pressure generator piston assembly 15 includes a piston sleeve 18, a piston 19 and a pin 20. The piston 19 is installed to the piston sleeve 18 through the pin 20. The piston sleeve 18 is connected to the pressure generator body 3 through threads. The lower end of the piston sleeve 18 has a double-layer sealing ring.

[0024] In the explosion transmission device, the function of the sealing ring is to prevent pressure release. There is no specific limit on the number of pins 20. The pressure level can be changed by changing the number of pins 20. The more pins 20 there are, the greater the pressure required to shear the pins 20. This piston assembly is smaller in size and more convenient to use.

[0025] In practical applications, the first aperture coupling 4 is provided with an air outlet 16, and both inner and outer sides of the first aperture coupling 4 are provided with threads. The first aperture coupling 4 is connected to the pressure generator body 3 via internal threads, and the first aperture coupling 4 is connected to the interlayer oil pipe 5 via external threads.

[0026] Figure 3 Schematic diagram of the structure of the second aperture coupling according to an embodiment of the present invention. Figure 3 As shown, the second aperture coupling 6 is provided with a liquid inlet hole 17, and the second aperture coupling 6 is provided with threads on both the inner and outer sides. The second aperture coupling 6 is connected to the sandwich oil pipe 5 through the internal threads, and the liquid inlet hole 17 is provided with a rubber plug.

[0027] It should be noted that the aperture of the first aperture collar 4 is smaller than the aperture of the second aperture collar 6 .

[0028] In addition, the input coupling 7 is provided with threads inside, the upper end of the input coupling 7 is connected to the external threads of the second aperture coupling 6 through internal threads, and the lower end of the input coupling 7 is connected to the pressure opening upper body 8.

[0029] It should be noted that the length of the sandwich oil pipe 5 is determined according to the thickness of the sandwich layer.

[0030] In practical applications, the gas outlet 16, the liquid inlet 17 and the sandwich oil pipe 5 are connected together to form a pressure transmission pipe string. The rubber plug provided with the liquid inlet 17 can be used according to the actual situation on site. The rubber plug can be installed after the liquid is injected into the pressure transmission pipe string before going down the well, or the pipe string can be directly lowered into the well without installing the rubber plug. The downhole liquid is automatically injected into the pipe string, and the gas in the pipe string is discharged from the gas outlet 16. At the same time, after the perforation is completed, the excess energy can be released through the gas outlet 16 and the liquid inlet 17 to ensure the safety of the sandwich pipe string 5.

[0031] At the same time, the pressure opening upper body 8 and the pressure opening lower body 9 form a traditional pressure detonation device to realize the detonation of the booster tube and the detonating cord in the gun joint 10, and cause the detonation of the lower perforating gun 11 under the action of the detonation energy.

[0032] Based on an infinite-stage well oil pipe-transported perforation interlayer explosion transmission device, the present invention also briefly describes its operation method. The infinite-stage explosion transmission perforation operation is provided with a plurality of interlayer explosion transmission devices, and perforating guns are provided between adjacent interlayer explosion transmission devices.

[0033] In actual applications, for large-span perforating operations in supplementary wells, unlimited-stage explosive perforating is achieved by connecting in series the first-stage perforating gun, interlayer explosive transmission device, second-stage perforating gun, interlayer explosive transmission device, third-stage perforating gun, interlayer explosive transmission device, fourth-stage perforating gun...

[0034] The device proposed by the present invention has a simple structure and is easy to install, which further improves the reliability of construction and reduces construction costs.

[0035] The following combination Figures 1 to 4 Specific embodiments The specific implementation of the present invention is described in detail. Before the perforating operation is performed, the following process of the present invention can be combined with a perforating gun to form a perforating gun string.

[0036] In this embodiment, the sealing ring is first put on the pressure generator joint 2, the pressure opening upper body 8, the pressure opening lower body 9 and the gun joint 10, and then the partition igniter 12 is installed in the pressure generator joint 2, and then the conical plug 13 is installed on one end of the pressure generator joint 2, and the detonating cord and the booster tube led out from the upper perforating gun 1 are inserted into the other end and connected to the partition igniter.

[0037] Next, the propellant cartridge 14 is loaded into one end of the pressure generator body 3, and the piston 19 with the sealing ring installed is loaded into the piston sleeve 18 through the pin 20 to form the pressure generator piston assembly 15, and then the pressure generator piston assembly 15 is connected to the other end of the pressure generator body 3 through threads.

[0038] Afterwards, the detonating cord and the detonating tube led out from the lower-level perforating gun 11 are inserted into the gun connection joint 10 .

[0039] Finally, the upper perforating gun 1, the pressure generator joint 2, the pressure generator body 3, the first aperture coupling 4, the interlayer oil pipe 5, the second aperture coupling 6, the input coupling 7, the pressure opening upper body 8, the pressure opening lower body 9, the gun joint 10 and the lower perforating gun 11 are connected in sequence.

[0040] In practical applications, for supplementary wells that require multi-layer perforation, the next-level interlayer explosion transmission device is connected in the same way, and the number of perforation levels that need to be lowered into the pipe string is determined according to site needs and connected.

[0041] In this embodiment, if it is determined to inject liquid on the ground, the injection method needs to be determined according to the on-site conditions. The rubber plug of the liquid inlet hole 17 on the second aperture coupling 6 needs to be pulled out, and liquid needs to be injected into the pipe string. The air in the pipe string is discharged through the air outlet hole 16 on the small-hole coupling 4, and then the rubber plug is installed, and then the pipe string is lowered into the well; if it is determined to inject liquid downhole, the rubber plug of the liquid inlet hole 17 on the second aperture coupling 6 needs to be pulled out first, and then the pipe string is lowered into the well. The liquid in the well will enter the pipe string through the liquid inlet hole 17, and the air in the pipe string will be discharged through the air outlet hole 17 on the first aperture coupling 4, thereby completing the injection of liquid in the pipe string.

[0042] In actual application, after the perforating gun starts to detonate, the detonating cord of the upper perforating gun 1 starts to deflagrate rapidly along the detonating cord from the top of the upper perforating gun 1, generating detonation energy, igniting the perforating bullets through which the detonating cord passes, and realizing the detonation of the upper perforating gun 1. At the same time, the detonation energy quickly reaches the pressure generator joint 2 connected to the bottom end of the upper perforating gun 1, and then ignites the partition igniter 12. The partition igniter 12 generates huge detonation energy, and under the action of the conical plug 13, a concentrated airflow is generated and ejected, igniting the propellant cartridge 14. The propellant cartridge 14 burns violently in the combustion chamber to generate high-temperature and high-pressure gas. The piston 19 in the pressure generator piston assembly 15 cuts off the pin 20 under the action of the high-pressure gas and enters the first aperture coupling 4.

[0043] In this embodiment, since the liquid is incompressible, the piston 19, pushed by the high-pressure gas, transfers the pressure through the first aperture coupling 4, the interlayer oil pipe 5 and the liquid in the second aperture coupling 6 to the pressure detonator composed of the pressure opening upper body 8 and the pressure opening lower body 9. When the pressure reaches a certain value, the pressure detonator detonates, ignites the detonator tube and the detonating cord in the gun connector 10, and then detonates the lower perforating gun 11.

[0044] In practical applications, all perforating guns in the pipe string are detonated in this way, and the transmission of explosion of the perforated interlayer by the oil pipe of the infinite-stage plugging well and the detonation process of the perforating gun are realized to complete the perforating operation.

[0045] The invention provides an infinite-stage perforation well oil pipe-transmitted perforation interlayer explosion transmission device and method, which solves the explosion transmission problem of perforation wells with opened formations, multiple interlayers and large section distances. On the basis of safety, the interlayer explosion transmission device is further simplified, the reliability of construction is improved, and multi-stage perforation is completed at one time in perforation wells with large spans and multiple sections.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device, characterized in that: include: An upper-level perforating gun (1), wherein the lower end of the upper-level perforating gun (1) is connected to a pressure generator, and the pressure generator is connected to a coupling mechanism, wherein the coupling mechanism comprises a first aperture coupling (4), a second aperture coupling (6) and an input coupling (7), wherein the upper end of the first aperture coupling (4) is connected to the pressure generator, and an interlayer oil pipe (5) is installed between the first aperture coupling (4) and the second aperture coupling (6), wherein the aperture of the first aperture coupling (4) is smaller than the aperture of the second aperture coupling (6), and the second aperture coupling (6) is connected to the input coupling (7), wherein the inner side of the input coupling (7) is a pressure opening upper body (8), and the lower end of the pressure opening upper body (8) is a pressure opening lower body (9), and the pressure opening lower body (9) is connected to a lower-level perforating gun (11) via a gun connecting joint (10); The pressure generator comprises a pressure generator joint (2), a pressure generator body (3) and a pressure generator piston assembly (15); the upper end of the pressure generator joint (2) is connected to an upper-stage perforating gun (1); the lower end of the pressure generator joint (2) is connected to the pressure generator body (3); the lower end of the pressure generator body (3) is connected to a first aperture coupling (4); and the pressure generator piston assembly (15) is installed inside the pressure generator body (3).

2. The infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to claim 1 is characterized in that: The pressure generator joint (2) is provided with an inner cavity, in which a partition igniter (12) is installed. A conical plug (13) is installed at the lower end of the pressure generator joint (2), and the conical plug (13) is connected to the pressure generator body (3).

3. The infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to claim 2 is characterized in that: The pressure generator body (3) is provided with three cavities inside, namely a first cavity, a second cavity and a third cavity. The first cavity is provided with a propellant cartridge (14), the second cavity is a combustion chamber, and the third cavity is provided with a pressure generator piston assembly (15).

4. The infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to claim 1 is characterized in that: The pressure generator piston assembly (15) comprises a piston sleeve (18), a piston (19) and a pin (20); the piston (19) is mounted on the piston sleeve (18) via the pin (20); the piston sleeve (18) is connected to the pressure generator body (3) via threads; and a double-layer sealing ring is provided at the lower end of the piston sleeve (18).

5. The infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to claim 1 is characterized in that: The first aperture coupling (4) is provided with an air outlet hole (16), and threads are provided on both the inner and outer sides of the first aperture coupling (4). The first aperture coupling (4) is connected to the pressure generator body (3) via internal threads, and the first aperture coupling (4) is connected to the sandwich oil pipe (5) via external threads.

6. The infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to claim 1 is characterized in that: The second aperture coupling (6) is provided with a liquid inlet hole (17), the second aperture coupling (6) is provided with threads on both the inner and outer sides, the second aperture coupling (6) is connected to the sandwich oil pipe (5) via the internal threads, and the liquid inlet hole (17) is provided with a rubber plug.

7. The infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to claim 6 is characterized in that: The input coupling (7) is provided with threads inside, the upper end of the input coupling (7) is connected to the external threads of the second aperture coupling (6) via internal threads, and the lower end of the input coupling (7) is connected to the pressure opening upper body (8).

8. The infinite-stage perforation well oil pipe conveying perforation interlayer explosion transmission device according to claim 5 is characterized in that: The length of the sandwich oil pipe (5) is determined according to the thickness of the sandwich layer.

9. An operation method of an infinite-stage perforation well oil pipe-transmitted perforation interlayer explosion transmission device based on any one of claims 1 to 8, characterized in that: include: The infinite-stage explosion-transmitting perforating operation is provided with a plurality of interlayer explosion-transmitting devices, and perforating guns are provided between adjacent interlayer explosion-transmitting devices.

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