Perforator and perforation method based on cable-free connection

Abstract

Disclosed are a perforator and perforation method based on cable-free connection. The perforator sequentially comprises, from top to bottom along the depth of a shaft, a data return portion (1), an electromagnetic deceleration portion (2), a detonation disconnecting portion and a perforating gun, wherein the data return portion is used for acquiring underground perforation operation data, and the data return portion at least comprises a power portion used for providing power for the perforator to return to the ground after a perforation operation; the electromagnetic deceleration portion is used for controlling a magnetic force of a casing for the perforator and adjusting the position of the perforator in a horizontal well section; the detonation disconnecting portion is used for performing detonation after the perforation operation is completed, so as to disconnect the detonation disconnecting portion from the perforating gun; and the perforating gun is used for launching internal perforating charge into a formation. The perforator and perforation method for performing perforation without using a cable can replace a conventional cable connection or coiled tubing conveyance type underground perforation well completion operation, and have the advantages of low operation cost and high well completion efficiency.

Description

Perforating instrument and perforating method based on non-cable connection

[0001] Related applications

[0002] This application claims priority to the Chinese invention patent application with application number 202311793614.5 filed on December 25, 2023, and cites the entire contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present disclosure relates to the field of oil development, in particular to the field of oil perforation completion technology, and in particular to a perforating instrument based on a cable-free connection and a perforating method. Background Art

[0004] Throughout the oil development process, perforating technology is a crucial component of well completion. Traditional perforating operations often utilize cables or continuous tubing for manual operation of downhole tools, but this is time-consuming, inefficient, and costly. For example, existing technologies typically utilize cable connections or continuous tubing for downhole delivery. In these methods, controlling the downhole rate is crucial. Currently, optimizing cable materials and increasing cable breaking strength are the primary approaches to increase tool downhole rates. However, these methods still fail to effectively control downhole speeds and address the numerous surface equipment requirements, resulting in low equipment utilization, cumbersome and time-consuming operations, high operating costs, and the inability to perform continuous fracturing operations.

[0005] In summary, there is an urgent need for a more efficient perforation technology in the existing technology, which has important practical value for the exploitation of oil and gas fields. Summary of the Invention

[0006] The embodiments of the present disclosure provide a perforating instrument and perforating method based on a cable-free connection, which innovatively performs perforating operations in a cable-free manner and adopts a modular design of each component to accommodate perforating guns of different specifications. The instrument can be applied to different oil and gas wells, replacing conventional cable-connected or coiled tubing-based downhole perforating completion operations. The instrument has the advantages of low operating costs and high completion efficiency, and solves the problems of conventional perforating technology with cumbersome and time-consuming operations, high operating costs, and the inability to perform continuous fracturing operations.

[0007] In one aspect, an embodiment of the present disclosure provides a perforating instrument based on a cableless connection, which comprises, from top to bottom at the depth of the wellbore: a data return unit, an electromagnetic deceleration unit, an explosive disconnection unit, and a perforating gun; wherein:

[0008] The data return unit is used to collect the perforation operation data in the well. The data return unit at least includes a power unit, which is used to power the perforator to return to the surface after the perforation operation;

[0009] The electromagnetic deceleration unit is used to control the magnetic force of the casing on the perforator and adjust the position of the perforator in the horizontal well section;

[0010] The detonation disconnecting part is used to detonate after the perforating operation is completed to disconnect the detonation disconnecting part and the perforating gun;

[0011] The perforating gun is used to inject the perforating charges inside the gun into the formation.

[0012] In some embodiments of the present disclosure, the power unit includes a propeller, a motor, a gyroscope, and a battery;

[0013] The detonation disconnection part also includes: a magnetic positioning part for once positioning the perforating instrument in the wellbore;

[0014] The power unit is also used to perform secondary positioning of the perforator through a gyroscope after the primary positioning.

[0015] In some embodiments of the present disclosure, the battery includes at least two parts, wherein at least one part of the battery is disposed below the explosive disconnect portion.

[0016] In some embodiments of the present disclosure, the perforating instrument based on a cableless connection further includes:

[0017] The fishing head is arranged above the data return unit and is used to fish the perforator;

[0018] The buoyancy chamber is arranged on the upper part of the electromagnetic deceleration part, and is used to reduce the descent speed of the perforating instrument in the wellbore and provide power for the perforating instrument to return to the ground.

[0019] In some embodiments of the present disclosure, a perforating gun includes: a perforating gun body and a bridge plug setting portion, wherein:

[0020] The bridge plug setting part is arranged at the lower part of the perforating gun body and is used to set the formation;

[0021] The perforating gun body and the bridge plug setting part are made of soluble alloy materials.

[0022] In some embodiments of the present disclosure, the bridge plug setting part includes:

[0023] Powder chamber: located at the bottom of the perforating gun, used to provide setting power, and with a first pin inside;

[0024] The release handle is provided at the lower part of the powder chamber and is provided with a second pin, and the shear force causing the first pin to break is smaller than the shear force causing the second pin to break;

[0025] The push cylinder is mounted on the powder chamber and the outside of the release handle;

[0026] The rubber cylinder is arranged at the lower part of the push cylinder and is used to seal the wellbore;

[0027] The fixed cone is provided at the lower part of the rubber cylinder and is used to cooperate with the push cylinder to squeeze the rubber cylinder, and the end of the fixed cone facing the bottom of the well is tapered;

[0028] Slips are the conical part of the sleeve and fixed cone, used to seal the wellbore.

[0029] In some embodiments of the present disclosure, the bridge plug setting part further includes:

[0030] The elastic claw is arranged inside the rubber cylinder, and the end facing the bottom of the well is a claw structure. The claw structure is used to cooperate with the clamping groove of the fixed cone to fix the rubber cylinder after sealing.

[0031] On the other hand, an embodiment of the present disclosure provides a method for perforating using the above-mentioned perforating instrument based on a cableless connection, the method comprising:

[0032] The magnetic positioning unit and gyroscope of the perforating instrument position the perforating instrument according to the wellbore structure data acquired in advance, so that the current depth of the perforating instrument is the preset perforating depth;

[0033] The perforating gun of the perforator perforates the layer corresponding to the perforation depth;

[0034] The detonation disconnect part of the perforator reduces the weight of the perforator;

[0035] The power unit on the perforating instrument provides thrust to return the perforating instrument to the surface, wherein the perforating instrument stores the perforating operation data collected downhole.

[0036] In some embodiments of the present disclosure, a magnetic positioning unit and a gyroscope of the perforating instrument position the perforating instrument based on pre-acquired wellbore structure data so that the current depth of the perforating instrument is a preset perforating depth, including:

[0037] Position the perforating instrument once based on the wellbore structure data and the magnetic positioning part of the perforating instrument;

[0038] The magnetic positioning part of the perforating instrument positions the perforating instrument once according to the wellbore structure data;

[0039] The gyroscope determines the perforator's current descent rate;

[0040] The magnetic positioning unit performs secondary positioning on the perforating instrument according to the current descent speed so that the current depth is the perforating depth.

[0041] In some embodiments of the present disclosure, the detonation disconnect portion of the perforating instrument reduces the weight of the perforating instrument, including:

[0042] The explosive disconnecting part detonates the pyrotechnic device inside the part and causes it to break, so that the explosive disconnecting part and the components below it are separated from the perforating instrument.

[0043] In some embodiments of the present disclosure, before the magnetic positioning unit and the gyroscope of the perforating instrument position the perforating instrument according to the pre-acquired wellbore structure data so that the current depth of the perforating instrument is the preset perforating depth, the method further includes:

[0044] The power unit and the buoyancy chamber of the perforator control the descent speed of the perforator in the wellbore;

[0045] After the detonation disconnection part of the perforating instrument reduces the weight of the perforating instrument, it also includes:

[0046] The buoyancy chamber provides buoyancy to return the perforator to the surface.

[0047] In some embodiments of the present disclosure, before the perforating gun of the perforating instrument perforates the layer corresponding to the perforating depth, the method further includes:

[0048] The electromagnetic deceleration unit of the perforator controls the magnetic force between the perforator and the casing so that the perforator is located on the central axis of the casing;

[0049] After the perforating gun of the perforating instrument perforates the layer corresponding to the perforating depth, the following steps are also performed:

[0050] The electromagnetic deceleration unit eliminates the magnetic force.

[0051] In some embodiments of the present disclosure, the perforating instrument includes at least two electromagnetic deceleration parts, respectively located at the top and the bottom of the perforating instrument; the perforating method further includes:

[0052] When the perforating section is a horizontal section, the two electromagnetic deceleration parts adjust the magnetic force exerted on the perforator in the casing so that the perforator is located on the central axis of the casing.

[0053] In some embodiments of the present disclosure, before the perforating gun of the perforating instrument perforates the layer corresponding to the perforating depth, the method further includes:

[0054] The bridge plug setting part at the bottom of the perforating instrument seals the wellbore.

[0055] In some embodiments of the present disclosure, the bridge plug setting portion at the bottom of the perforating instrument sets the wellbore, including:

[0056] The bridge plug is set to ignite the gunpowder inside the gunpowder chamber, breaking the first pin inside the gunpowder chamber and generating thrust to push the push tube toward the fixed cone, thereby squeezing the rubber tube between the push tube and the fixed cone, causing the rubber tube to seal the wellbore;

[0057] The fixed cone has a tapered end which is thrust into the interior of the slips to seal the wellbore with the slips;

[0058] The second pin in the release handle at the lower part of the powder chamber is broken by the thrust, so that the bridge plug is set and separated from the perforating instrument, wherein the shear force of the first pin breaking is smaller than the shear force of the second pin breaking.

[0059] In some embodiments of the present disclosure, the bridge plug setting portion at the bottom of the perforating instrument sets the wellbore, further comprising:

[0060] The elastic claws inside the rubber cartridge are clamped on the clamping groove of the fixed cone by thrust to fix the rubber cartridge after setting. The perforating gun and the bridge plug setting part are made of soluble alloy materials.

[0061] Third, an embodiment of the present disclosure provides a perforating system based on a cable-free perforating instrument, the system comprising:

[0062] A depth positioning module is used to position the perforator according to pre-acquired wellbore structure data, the magnetic positioning part of the perforator and the gyroscope, so that the current depth of the perforator is the preset perforating depth;

[0063] The layer perforation module is used to perforate the layer corresponding to the perforation depth through the perforating gun of the perforator;

[0064] A weight reduction module for reducing the weight of the perforating instrument by using a detonation disconnect portion of the perforating instrument;

[0065] The perforating instrument returns to the first module, which is used to return the perforating instrument to the ground through the thrust provided by the power unit on the perforating instrument, wherein the perforating instrument stores the perforating operation data collected downhole.

[0066] In some embodiments of the present disclosure, the depth positioning module includes:

[0067] A primary positioning unit, used for performing primary positioning of the perforating instrument based on wellbore structure data and the magnetic positioning part of the perforating instrument;

[0068] a download speed determination unit, configured to determine a current descent speed of the perforator based on a gyroscope;

[0069] The secondary positioning unit is used to perform secondary positioning on the perforator according to the current descent speed so that the current depth is the perforating depth.

[0070] In some embodiments of the present disclosure, the weight reduction module includes:

[0071] The weight reduction unit is used for detonating the pyrotechnics inside the explosive disconnecting part and causing it to break, so that the explosive disconnecting part and the components below it are separated from the perforating instrument.

[0072] In some embodiments of the present disclosure, the perforating system based on the cableless perforating instrument further includes:

[0073] A descent speed control module, used to control the descent speed of the perforator in the wellbore through the power unit and the buoyancy chamber of the perforator;

[0074] The perforating instrument returns to the second module, which is used to return the perforating instrument to the ground through the buoyancy provided by the buoyancy chamber.

[0075] In some embodiments of the present disclosure, the perforating system based on the cableless perforating instrument further includes:

[0076] A position adjustment module is used to control the magnetic force between the perforator and the casing through the electromagnetic deceleration unit of the perforator so that the perforator is located on the central axis of the casing;

[0077] The magnetic force elimination module is used to eliminate the magnetic force through the electromagnetic deceleration unit.

[0078] In some embodiments of the present disclosure, in a perforating system based on a cableless perforating instrument, the perforating instrument includes at least two electromagnetic deceleration parts, respectively located at the top and top (or bottom) of the perforating instrument; the perforating system based on the cableless perforating instrument further includes:

[0079] The magnetic force adjustment module is used to adjust the magnetic force exerted on the perforator in the casing through two electromagnetic deceleration parts when the perforating section is a horizontal well section, so that the perforator is located on the central axis of the casing.

[0080] In some embodiments of the present disclosure, the perforating system based on the cableless perforating instrument further includes:

[0081] The wellbore setting module is used to seal the wellbore through the bridge plug setting part at the bottom of the perforating instrument.

[0082] In some embodiments of the present disclosure, the wellbore setting module includes:

[0083] The primary setting unit is used to ignite the gunpowder inside the gunpowder chamber of the bridge plug setting device, breaking the first pin inside the gunpowder chamber and generating thrust to push the push tube toward the fixed cone, thereby squeezing the rubber tube between the push tube and the fixed cone and setting the rubber tube in the wellbore;

[0084] The secondary setting unit is used to push the tapered end of the fixed cone into the interior of the slips through thrust, so that the slips can be set to seal the wellbore;

[0085] The bridge plug detachment unit is used to break the second pin in the release handle at the lower part of the gunpowder chamber by thrust, so that the bridge plug is set and separated from the perforating instrument, wherein the shear force of the first pin breaking is smaller than the shear force of the second pin breaking.

[0086] In some embodiments of the present disclosure, the wellbore setting module further includes:

[0087] The rubber cartridge fixing unit is used to clamp the elastic claw inside the rubber cartridge on the clamping groove of the fixing cone through thrust to fix the rubber cartridge after setting. The perforating gun and the bridge plug setting part are made of soluble alloy material.

[0088] In a fourth aspect, the present disclosure provides a computer program product, comprising a computer program / instruction, which, when executed by a processor, implements steps of a perforating method based on a cableless connection.

[0089] In a fifth aspect, the present disclosure provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, steps of a perforating method based on a cable-free connection are implemented.

[0090] In a sixth aspect, the present disclosure provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of a perforating method based on a cableless connection when executed by a processor.

[0091] As can be seen from the above description, the embodiments of the present disclosure provide a perforating instrument and a perforating method based on a cable-free connection, wherein the perforating instrument comprises, from top to bottom at the depth of the wellbore: a data return unit, an electromagnetic deceleration unit, a detonation disconnection unit, and a perforating gun; wherein: the data return unit is used to collect perforating operation data downhole, and the data return unit includes at least a power unit for powering the perforating instrument to return to the ground after the perforating operation; the electromagnetic deceleration unit is used to control the magnetic force of the casing on the perforating instrument and adjust the position of the perforating instrument in the horizontal well section; the detonation disconnection unit is used to detonate after the perforating operation is completed to disconnect the detonation disconnection unit and the perforating gun; the perforating gun is used to inject the perforating bullet inside it into the formation.

[0092] The perforating method applied to the above-mentioned perforating instrument includes: first, the magnetic positioning unit and gyroscope of the perforating instrument position the perforating instrument according to pre-acquired wellbore structure data so that the current depth of the perforating instrument is a preset perforating depth; the perforating gun of the perforating instrument perforates the layer corresponding to the perforating depth; then, the detonation and disconnection unit of the perforating instrument reduces the weight of the perforating instrument; and finally, the power unit of the perforating instrument provides thrust to return the perforating instrument to the surface, wherein the perforating instrument stores the perforating operation data collected underground.

[0093] The present disclosure innovatively proposes a perforating instrument and a corresponding perforating method for performing perforating operations in a cable-free manner, which can replace conventional cable-connected or coiled tubing-conveyed downhole perforating completion operations. It has the advantages of low operating costs and high completion efficiency, and solves the problems of traditional perforating technology, such as cumbersome and time-consuming operations, high operating costs, and the inability to perform continuous fracturing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0095] FIG1 is a schematic structural diagram of a power unit in an embodiment of the present disclosure;

[0096] FIG2 is a schematic structural diagram of an electromagnetic deceleration unit in an embodiment of the present disclosure;

[0097] FIG3 is a schematic structural diagram of a buoyancy chamber in an embodiment of the present disclosure;

[0098] FIG4 is a schematic structural diagram of an initiation and disconnection portion in an embodiment of the present disclosure;

[0099] FIG5 is a schematic structural diagram of a perforating gun in an embodiment of the present disclosure;

[0100] FIG6 is a first structural diagram of a bridge plug setting portion in an embodiment of the present disclosure;

[0101] FIG7 is a second structural schematic diagram of the bridge plug setting portion in an embodiment of the present disclosure;

[0102] FIG8 is a first structural diagram of an elastic claw in an embodiment of the present disclosure;

[0103] FIG9 is a second structural diagram of the elastic claw in an embodiment of the present disclosure;

[0104] FIG10 is a third structural diagram of the elastic claw in an embodiment of the present disclosure;

[0105] FIG11 is a schematic structural diagram of the inclined surface of the fixed cone in an embodiment of the present disclosure;

[0106] FIG12 is a first structural diagram of a perforating instrument based on a cable-free connection in an embodiment of the present disclosure;

[0107] FIG13 is a flow chart of step 100 in a perforating method based on a cableless connection according to an embodiment of the present disclosure;

[0108] FIG14 is a flow chart of step 300 in a perforating method based on a cableless connection according to an embodiment of the present disclosure;

[0109] FIG15 is a second structural diagram of a perforating instrument based on a cable-free connection in an embodiment of the present disclosure;

[0110] FIG16 is a third structural diagram of a perforating instrument based on a cable-free connection in an embodiment of the present disclosure;

[0111] FIG17 is a fourth structural diagram of a perforating instrument based on a cable-free connection in an embodiment of the present disclosure;

[0112] FIG18 is a fifth structural diagram of a perforating instrument based on a cable-free connection in an embodiment of the present disclosure;

[0113] FIG19 is a sixth structural diagram of a perforating instrument based on a cable-free connection in an embodiment of the present disclosure;

[0114] FIG20 is a seventh structural diagram of a perforating instrument based on a cable-free connection in an embodiment of the present disclosure;

[0115] FIG21 is a flow chart of step 180 in a perforating method based on a cableless connection according to an embodiment of the present disclosure;

[0116] FIG22 is a second flow diagram of step 180 in the perforating method based on cableless connection provided in an embodiment of the present disclosure;

[0117] FIG23 is a schematic flow diagram of a perforating method based on a cable-free connection in a specific application example of the present disclosure;

[0118] FIG24 is a mind map of a perforating method based on a cable-free connection in a specific application example of the present disclosure;

[0119] FIG25 is a first structural diagram of a perforating system based on a cable-free connection in an embodiment of the present disclosure;

[0120] FIG26 is a schematic structural diagram of the depth positioning module 10 in an embodiment of the present disclosure;

[0121] FIG27 is a schematic structural diagram of a weight reduction module 30 in an embodiment of the present disclosure;

[0122] FIG28 is a second structural diagram of a perforating system based on a cable-free connection in an embodiment of the present disclosure;

[0123] FIG29 is a third structural diagram of a perforating system based on a cable-free connection in an embodiment of the present disclosure;

[0124] FIG30 is a fourth structural diagram of a perforating system based on a cable-free connection in an embodiment of the present disclosure;

[0125] FIG31 is a fifth structural diagram of a perforating system based on a cable-free connection in an embodiment of the present disclosure;

[0126] FIG32 is a first structural diagram of the wellbore setting module 90 in an embodiment of the present disclosure;

[0127] FIG33 is a second structural diagram of the wellbore setting module 90 in an embodiment of the present disclosure;

[0128] FIG34 is a schematic diagram of the physical structure of an electronic device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0129] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0130] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0131] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present disclosure and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices. The embodiments of the present disclosure and the features described in the embodiments may be combined with each other unless there is a conflict. The present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0132] The acquisition, storage, use, and processing of data in the technical solution disclosed herein are in compliance with relevant laws and regulations.

[0133] The embodiment of the present disclosure provides a specific implementation of a perforating instrument based on a cableless connection. The perforating instrument comprises, from top to bottom at the depth of the wellbore, a data return unit, an electromagnetic deceleration unit, an explosive disconnection unit, and a perforating gun. Specifically:

[0134] The data return unit is used to collect perforation operation data in the well. The data return unit at least includes a power unit, which is used to power the perforator to return to the surface after the perforation operation;

[0135] 1 , the data return portion 1 is exemplarily shaped as a sphere, and this design makes it easier for the data return portion 1 to return to the surface within the wellbore.

[0136] The electromagnetic deceleration unit is used to control the magnetic force of the casing on the perforator and adjust the position of the perforator in the horizontal well section;

[0137] Referring to Figures 2 and 3, the electromagnetic deceleration unit 2 consists of a multi-faceted electromagnet (arranged around the main body of the electromagnetic deceleration unit), a speed sensor, a current regulation chip, a current circuit, etc.; the suction force of the casing on the magnet is used to increase the friction force opposite to the movement speed of the perforator, and the current in the electromagnet mechanism is controlled according to the change in the perforator's descent speed, thereby changing the magnetic force of the electromagnet to achieve the purpose of controlling the perforator's descent speed and adjusting the perforator's position in the vertical and horizontal well sections.

[0138] The detonation disconnecting part is used to detonate after the perforating operation is completed to disconnect the detonation disconnecting part and the perforating gun;

[0139] As shown in Figure 4, the blaster disconnect unit consists of a pyrotechnic release handle 3-1, an ignition head 3-2, and a chip 3-3. The pyrotechnic release handle is located at the head of the blaster disconnect unit and is connected to the electromagnetic deceleration unit. After perforating, it is used to discard all components below the electromagnetic deceleration unit, reducing the total weight of the perforating instrument before returning to the surface, significantly reducing the load on the power unit of the data return unit.

[0140] The perforating gun is used to inject the perforating charges inside the gun into the formation.

[0141] As shown in Figure 5, the perforating gun primarily consists of a female connector and a gun body 5-1. Installed at the rear of the detonator, the gun is an improvement on the existing structure, made of a soluble alloy. This allows the gun to self-destruct after perforation, breaking into debris that is discarded at the bottom of the well.

[0142] The adjacent components are connected using trapezoidal threads. The adjacent components are joined to form a cavity extending along the axial direction. The maximum cross-sectional diameter of each component does not exceed the outer diameter of the commonly used perforating gun to which it is connected. A male connector is provided on the mating surface of one of the two connected components, while the corresponding mating surface of the other component is provided with a female connector that mates with the male connector in a concave-convex manner. These mating threads ensure radial positioning accuracy of the two adjacent components when they are joined.

[0143] As can be seen from the above description, an embodiment of the present disclosure provides a perforating instrument based on a cable-free connection, which includes, from top to bottom at the depth of the wellbore: a data return unit, an electromagnetic deceleration unit, a detonation disconnection unit, and a perforating gun; wherein: the data return unit is used to collect perforating operation data downhole, and the data return unit at least includes a power unit for powering the perforating instrument to return to the ground after the perforating operation; the electromagnetic deceleration unit is used to control the magnetic force of the casing on the perforating instrument and adjust the position of the perforating instrument in the horizontal well section; the detonation disconnection unit is used to detonate after the perforating operation is completed to disconnect the detonation disconnection unit and the perforating gun; the perforating gun is used to inject the perforating bullet inside it into the formation.

[0144] The embodiment of the invention provides a perforating instrument based on a cable-free connection, which can provide the ascending power of the cable-free perforating equipment in the limited space underground, replacing the conventional downhole operation method, requiring less ground equipment, and having the advantages of simple operation, low operating cost, and high operation efficiency. It solves the problems of perforating operations relying on long cable downhole times, low utilization rate of ground equipment, and cumbersome operations for a specific number of perforating clusters.

[0145] In some embodiments of the present disclosure, the power unit includes a propeller, a motor, a gyroscope, and a battery;

[0146] Referring to Figure 1, the propeller 1-1 is used to provide thrust to the perforator. Furthermore, the power unit also includes a propeller power control system, a motor compartment, a battery compartment (containing batteries 1-3), etc. The power unit is used to more accurately adjust the position of the perforator when the perforator moves to the designated operating position, and serves as the main return power device after the perforating operation.

[0147] One end of propeller 1-1 is threadedly connected to the rest of the data return module. The other end features a curved surface designed to facilitate fluid entry based on fluid flow characteristics. Bearings are also installed to secure the rotating shaft of propeller 1-1. The propeller power control system automatically controls the downhole depth of the perforating instrument by regulating the motor's output speed and torque. The instrument boasts a stable and reliable structure. Furthermore, propeller 1-1 is uniquely suited for cased and small-diameter wells. The propeller component is exposed to the downhole drilling fluid environment. The rotating shaft connects the upper connection positioning structure and coupling 1-2 to stabilize the radial displacement of propeller 1-1. Contoured surfaces are designed on both adjacent ends of propeller 1-1 to facilitate fluid flow, and C-shaped reinforcement ribs are used to secure the two sides.

[0148] The detonation disconnection part also includes: a magnetic positioning part for once positioning the perforating instrument in the wellbore;

[0149] Specifically, the magnetic positioning unit consists of a pair of permanent magnets with opposite polarities and a coil. The permanent magnet generates a constant magnetic field. During continuous logging, as it passes through the casing, coupling, and casing, it causes the surrounding ferromagnetic material to change from thin to thick and then back to thin. This causes the magnetic flux passing through the coil to decrease and then increase again per unit time, generating an induced electromotive force within the coil. This induced electromotive force signal is recorded on the logging curve, indicating the position (depth) of the coupling. Changes in the structure, thickness, and deformation of the wellbore string compared to normal casing (or tubing), the presence of holes and cracks, and the presence of downhole tools all indicate changes in the ferromagnetic material in the wellbore, resulting in obvious anomalies on the logging curve.

[0150] In metal cased wells, CCL (Continuous Current Locator) and natural gamma ray logging curves can be used to accurately verify the depth of the casing string and the formation (referred to as "depth calibration"). The collar locator can be combined with many logging instruments for logging, such as gamma ray-well temperature-collar locator combination logging, and acoustic variable density-natural gamma ray-collar locator combination logging.

[0151] The power unit is also used to perform secondary positioning of the perforator through a gyroscope after the primary positioning.

[0152] Based on the single positioning, the perforator can be roughly located at the perforating depth, but it is not accurate enough at this time. A gyroscope (exemplarily a nine-axis gyroscope) is needed to determine the descent speed of the perforator, and the perforator is accurately calibrated in depth based on the single positioning result.

[0153] In some embodiments of the present disclosure, the battery includes at least two parts, wherein at least one part of the battery is disposed below the explosive disconnect portion.

[0154] It is understandable that this battery arrangement can provide sufficient power during the descent of the perforator and convert it into thrust to propel the perforator. After the perforator completes perforating, the detonating disconnect section is detonated to disconnect the components below it, and the depleted battery is discarded to reduce the weight of the perforator during the return to the ground. It should be pointed out that during the descent of the perforator, the battery below the detonating disconnect section should be used first, and the battery above the detonating disconnect section should be used during the return to the ground.

[0155] In some embodiments of the present disclosure, the perforating instrument based on a cableless connection further includes:

[0156] A fishing head is provided on the upper part of the data return unit and is used to fish out the perforating instrument;

[0157] On the one hand, when the perforator returns to the wellhead on the surface, the data is retrieved by grabbing the fishing head to complete the perforating operation.

[0158] On the other hand, if the perforator fails to complete its designated operation or an accident occurs underground, the detonation disconnector uses explosives to sever the data transmission line of the data return unit. The data return unit automatically rises to the surface with the latest data. After being salvaged from the wellhead, it facilitates surface personnel to respond to the underground situation. Alternatively, when the perforator is performing multi-cluster perforation operations, the data return unit takes on the role of data storage and transmission.

[0159] The buoyancy chamber is arranged on the upper part of the electromagnetic deceleration part, and is used to reduce the descent speed of the perforating instrument in the wellbore and provide power for the perforating instrument to return to the ground.

[0160] Referring to Figure 3, the buoyancy chamber 4 not only takes on the deceleration effect when the perforator falls, but also provides the buoyancy required for returning after the perforating operation. The effective reverse thrust provided by each buoyancy chamber is fixed, and the number of buoyancy chambers can be increased or decreased according to actual working conditions to control the buoyancy.

[0161] In some embodiments of the present disclosure, referring to FIG5 , a perforating gun includes: a perforating gun body 5 - 1 and a bridge plug setting portion 5 - 2 , wherein:

[0162] The bridge plug setting part 5-2 is provided at the lower part of the perforating gun body 5-1 and is used for setting the formation;

[0163] The perforating gun body 5 - 1 and the bridge plug setting part 5 - 2 are made of soluble alloy material.

[0164] The bridge plug setting section 5-2 is comprised of a newly designed setting tool, employing a pyrotechnic setting method that leverages the differential shear forces of large and small pins to achieve both setting and releasing operations. Furthermore, structural improvements have been made to the bridge plug, with a set of slips performing the operation, significantly reducing the weight of the setting tool. The addition of the soluble bridge plug setting section 5-2 to the perforating tool facilitates a more convenient bridge-and-shooting combination, significantly improving perforating efficiency and facilitating staged fracturing. This offers significant advantages in applications such as well rehabilitation and oil and gas well stimulation.

[0165] In some embodiments of the present disclosure, referring to FIG6 , the bridge plug setting unit includes: a powder chamber 6-1, a release handle 6-3, a push cylinder 6-5, a rubber cylinder 6-6, a fixing cone 6-7, and slips 6-8. Specifically:

[0166] Powder chamber 6-1: located at the bottom of the perforating gun body 5-1, used to provide setting power, and a first pin 6-2 is provided inside;

[0167] The release handle 6-3 is provided at the lower part of the powder chamber 6-1 and is provided with a second pin 6-4 (see FIG7 ). The second pin 6-4 is used to release the bridge plug from the perforating instrument.

[0168] The shear force causing the first pin 6-1 to break is smaller than the shear force causing the second pin 6-4 to break;

[0169] The push cylinder 6-5 is mounted on the outside of the powder chamber 6-1 and the release handle 6-3;

[0170] The rubber cylinder 6-6 is provided at the lower part of the push cylinder 6-5 and is used to seal the wellbore;

[0171] The fixed cone 6-7 is provided at the lower part of the rubber cylinder 6-6 and is used to cooperate with the push cylinder 6-5 to squeeze the rubber cylinder 6-6, and the end of the fixed cone 6-7 facing the bottom of the well is tapered;

[0172] The slips 6-8 are sleeved on the conical part of the fixed cone 6-7 and are used to seal the wellbore.

[0173] The setting principle of the above-mentioned bridge plug setting part is as follows: the gunpowder in the gunpowder chamber 6-1 is ignited, and the high-energy gas generated by the combustion enters the annulus through the channel 6-9. The first pin 6-2 (or called the setting pin, which is used to make the push cylinder 6-5 separate from the gunpowder chamber 6-1 and move toward the fixed cone 6-7) breaks first due to the smaller shear force, and the gas pushes the push cylinder 6-5 to move right (downward) (the gunpowder chamber 6-1 connects the release hand 6-3 and the core shaft 6-10, and the core shaft 6-10 has a tendency to move relatively to the left), and the fixed cone 6-7 also moves downward; since the setting head 6-11 is fixedly connected to the core shaft 6-10, the setting head 6-11 moves left (upward) relative to the slip 6-8, pushing the slip 6-8 to set; at the same time, after the slip 6-8 is set, the rubber sleeve 6-6 is squeezed by the fixed cone 6-7 and the push cylinder 6-5 for secondary setting.

[0174] In some embodiments of the present disclosure, referring to FIG8 , FIG9 and FIG10 , the bridge plug setting portion further includes:

[0175] The elastic claw 6-12 is arranged inside the rubber cylinder 6-6, and the end facing the bottom of the well is a claw structure 6-12-1, which is used to cooperate with the groove 6-7-1 of the fixed cone 6-7 to fix the rubber cylinder after sealing.

[0176] After the rubber sleeve 6-6 and slips 6-8 are set, the remaining high-energy gas pushes the push sleeve 6-5 and elastic claw 6-12. The elastic claw 6-12 is pushed inward along the inclined surface 6-13 in contact with the fixed cone 6-7 (see Figure 11), while moving to the right (downward), completely setting the rubber sleeve 6-6 without rebounding and causing the setting to fail. After all the setting work is completed, the push sleeve 6-5 cannot move downward, and the second pin 6-4 (also called the release pin) connecting the powder chamber 6-1 to the release handle 6-3 breaks, completing the release operation. The setting operation is complete. During subsequent fracturing operations, the release handle 6-3 and push sleeve 6-5 in the setting tool are subjected to the fracturing pressure and move downward, which improves the setting effect.

[0177] As can be seen from the above description, the embodiments of the present disclosure provide a perforating instrument based on a cable-free connection, which has the following beneficial effects:

[0178] 1. The perforating instrument adopts a modular design of each component and is compatible with perforating guns of different specifications. It can be applied to different oil and gas wells, replacing conventional cable-connected or coiled tubing-transported downhole perforating completion operations. It has the advantages of low operating costs and high completion efficiency. It solves the problems of traditional perforating technology, such as cumbersome and time-consuming operation, high operating costs, and inability to perform continuous fracturing operations.

[0179] 2. Due to the effect of gravity, the perforating gun sinks to the bottom of the horizontal well during traditional perforating operations, resulting in uneven hole sizes after perforation, which seriously affects the effectiveness of subsequent fracturing operations. To address this issue, relevant oil service companies in the industry have designed equal-aperture perforators, but this has not fundamentally solved the problem of uneven hole sizes in horizontal well perforations.

[0180] The perforating instrument provided by the disclosed embodiments overcomes the shortcomings of traditional perforating operations. After entering the horizontal section, the perforating instrument sinks to the bottom of the well due to gravity. A gyroscope detects the instrument's position and sends a signal. This, in turn, uses a chip to adjust the magnetic force of two opposing electromagnets on the electromagnet assembly, neutralizing the electromagnet near the bottom and increasing the magnetic force of the electromagnet near the top of the well casing. Ultimately, the buoyancy and the suction exerted by the electromagnet near the top of the casing balance the perforating instrument's own gravity, resulting in the perforating instrument being suspended in the center of the casing. Perforating operations can then be performed, achieving uniform aperture perforation in horizontal wells.

[0181] 3. Innovative design of deceleration method: The perforator provided by the disclosed embodiments no longer relies solely on a single deceleration method. Combining buoyancy, propeller power, and magnetic suction, it relies on buoyancy and electromagnet suction to decelerate the casing in vertical well sections. The buoyancy provided by the buoyancy chamber is fixed. The current flowing through the electromagnet is adjusted at any time according to the perforator's descent speed, changing the electromagnet's magnetic force and, consequently, the friction between the electromagnet and the casing, thereby controlling the perforator's descent speed. When the perforator moves near the perforating operation position, the propeller begins to operate, precisely adjusting the perforator's position.

[0182] The above-mentioned deceleration method, which utilizes a buoyancy chamber and an electromagnet device in the wellbore, is simple in structure, easy to operate, and can solve the problem of uneven perforation diameters in horizontal sections. Using a propeller alone for external power significantly increases the size and weight of the battery required for the perforator, and cannot achieve uniform perforation diameters in horizontal sections. Using buoyancy alone also makes it difficult to control the perforation position accuracy, and uniform perforation diameters cannot be achieved in horizontal sections.

[0183] 4. Improvements to the setting tool utilize the differential shear forces of large and small pins to facilitate both setting and releasing. Compared to traditional ball-dropping and electric setting methods, this offers advantages such as simpler structure and operation, significantly reducing the weight of the setting tool and embracing its use in a wide variety of applications. Furthermore, improvements have been made to the internal structure of the bridge plug module. By utilizing the retractable elastic claws, the claws are embedded in the retaining ring during the setting process, ensuring effective and stable setting.

[0184] The embodiment of the present disclosure provides a specific implementation of a cable-free perforating method using the above-mentioned cable-free perforating instrument. Referring to FIG. 12 , the method specifically includes the following contents:

[0185] Step 100: The magnetic positioning unit and the gyroscope of the perforating instrument position the perforating instrument according to the wellbore structure data acquired in advance, so that the current depth of the perforating instrument is the preset perforating depth;

[0186] Step 200: The perforating gun of the perforating instrument perforates the layer corresponding to the perforating depth;

[0187] Step 300: The detonation disconnection portion of the perforating instrument reduces the weight of the perforating instrument;

[0188] Step 400: The power unit on the perforating instrument provides thrust to return the perforating instrument to the surface, wherein the perforating instrument stores the perforating operation data collected downhole.

[0189] As can be seen from the above description, an embodiment of the present disclosure provides a perforating method based on a cable-free connection, including a magnetic positioning unit and a gyroscope of the perforating instrument for positioning the perforating instrument based on pre-acquired wellbore structure data so that the current depth of the perforating instrument is a preset perforating depth; the perforating gun of the perforating instrument perforates the layer corresponding to the perforating depth; the detonation disconnection unit of the perforating instrument reduces the weight of the perforating instrument; and the power unit on the perforating instrument provides thrust to return the perforating instrument to the ground, wherein the perforating instrument stores perforating operation data collected underground.

[0190] The present disclosure innovatively proposes a cable-free perforating method that can replace conventional cable-connected or coiled tubing-based downhole perforating completion operations. It has the advantages of low operating costs and high completion efficiency, and solves the problems of traditional perforating technology, such as cumbersome and time-consuming operations, high operating costs, and the inability to perform continuous fracturing operations.

[0191] In some embodiments of the present disclosure, the wellbore structure data in step 100 includes: the size of the casing used, such as length, connection type, etc. After obtaining the wellbore structure data, the current depth of the perforating instrument can be roughly calibrated in conjunction with the magnetic positioning unit.

[0192] In some embodiments of the present disclosure, for step 200, a perforating gun is a tool used to perform perforation operations in an oil well or other wellbore. Perforation refers to connecting the wellbore to the formation through the wellbore wall so that oil, gas or other fluids can flow into the wellbore. Exemplarily, the perforating gun includes:

[0193] The perforating gun body is the core component of the perforating instrument. It contains the detonator and the steel bullet. The perforating gun is detonated by an electrical signal or pressure signal, thereby shooting the steel bullet into the wellbore wall.

[0194] Perforating Charge: A perforating charge is a hollow metal steel bullet with an internal detonator. When the detonator is triggered, the perforating charge produces high-pressure gas or an explosion, thereby perforating the wellbore wall.

[0195] Control system: The perforating gun is equipped with a control system to control the timing, frequency, and location of the perforating operation. The control system is usually controlled by a computer or other electronic device and can be programmed and adjusted as needed.

[0196] In some embodiments of the present disclosure, for steps 300 and 400, since the perforating instrument of the embodiments of the present disclosure is not connected by cables, it is necessary to reduce the weight of the perforating instrument when the perforating operation is completed so that the perforating instrument can be returned to the ground under the push of the power unit.

[0197] In some embodiments of the present disclosure, referring to FIG. 13 , step 100 includes:

[0198] Step 101: The magnetic positioning unit of the perforating instrument performs a positioning operation on the perforating instrument according to the wellbore structure data;

[0199] It is understandable that the result of a positioning is a rough depth range, and the error is generally within 10 meters, so further precise positioning is required.

[0200] Step 102: The gyroscope determines the current descent speed of the perforator;

[0201] Step 103: The magnetic positioning unit performs secondary positioning on the perforating instrument according to the current descent speed so that the current depth is the perforating depth.

[0202] In step 102 and step 103, based on one positioning, combined with the current descent speed and the required moving distance, the time required for the perforator to further descend is calculated. When this time is reached, the current depth is the perforation depth.

[0203] In some embodiments of the present disclosure, referring to FIG. 14 , step 300 includes:

[0204] Step 301: The detonating disconnecting part detonates the pyrotechnic trigger inside the detonating disconnecting part and causes the detonating disconnecting part and the components below the detonating disconnecting part to separate from the perforating instrument.

[0205] For example, the detonation disconnection unit consists of a pyrotechnic release arm, an ignition head, a chip, etc. By discarding all components below the electromagnetic deceleration unit, the total weight of the cabin to be returned to the ground is reduced. At the same time, the number of batteries used is also reduced, which greatly reduces the load on the propeller power mechanism. The above-mentioned pyrotechnic release arm is a unique new structure, consisting of a detonating tube, an explosion-proof seal, a sealing ring, an explosive chamber, and a release arm seat. A thinned blasting point is reserved, and the release arm seat blasting point is blown off when the tail structure needs to be discarded; the sealing ring is installed at the connection between the upper joint and the release arm seat; the release arm seat has different diameter specifications, which are used to match various specifications of perforating guns, and can be applied to perforating operations in various oil and gas wells.

[0206] In some embodiments of the present disclosure, referring to FIG. 15 , the perforating method based on a non-cable connection further includes, before step 100:

[0207] Step 90: The power unit and the buoyancy chamber of the perforator control the descent speed of the perforator in the wellbore;

[0208] In addition, the descent speed of the perforator can also be controlled in the following way: according to the change of the descent speed of the perforator, the current in the electromagnet mechanism of the electromagnetic deceleration part is controlled, thereby changing the magnetic force of the electromagnet to achieve the purpose of controlling the descent speed of the perforator.

[0209] In some embodiments of the present disclosure, referring to FIG. 16 , the perforating method based on a non-cable connection further includes, after step 300 :

[0210] Step 310: The buoyancy chamber provides buoyancy to return the perforating instrument to the surface.

[0211] That is, during the process of the perforator returning to the ground, the thrust it needs is provided by the power unit and the buoyancy chamber. The number of buoyancy chambers can be increased or decreased according to the actual working conditions to increase the thrust.

[0212] In some embodiments of the present disclosure, referring to FIG. 17 , the perforating method based on a non-cable connection further includes, before step 200:

[0213] Step 190: The electromagnetic deceleration unit of the perforating instrument controls the magnetic force between the perforating instrument and the casing so that the perforating instrument is located on the central axis of the casing;

[0214] Specifically, referring to FIG2 , the magnitude of the current in the electromagnet mechanism of the electromagnetic deceleration unit is controlled to adjust the magnetic force of the electromagnet surfaces in different orientations.

[0215] In some embodiments of the present disclosure, referring to FIG. 18 , the perforating method based on a non-cable connection further includes, after step 200:

[0216] Step 210: The electromagnetic deceleration unit eliminates the magnetic force.

[0217] In some embodiments of the present disclosure, the perforating instrument includes at least two electromagnetic deceleration parts, respectively located at the top and top (or bottom) of the perforating instrument; referring to FIG19 , the perforating method based on the cable-free connection further includes:

[0218] Step 500: When the perforating section is a horizontal section, the two electromagnetic deceleration units adjust the magnetic force exerted on the perforator in the casing so that the perforator is located on the central axis of the casing.

[0219] After entering the horizontal section, the perforator sinks to the bottom of the well due to gravity. The gyroscope detects the perforator's attitude and sends a signal. This, in turn, uses a chip to adjust the magnetic force of the electromagnets on multiple surfaces of the electromagnetic deceleration unit, neutralizing those near the bottom and increasing those near the top of the wellbore casing. Finally, the buoyancy and the suction exerted by the electromagnets near the top of the casing balance the perforator's own weight, allowing the perforator to float in the center of the casing. Perforating operations can then be performed, enabling perforation of uniform apertures in horizontal wells.

[0220] In some embodiments of the present disclosure, referring to FIG. 20 , the perforating method based on a non-cable connection further includes, before step 200:

[0221] Step 180: The bridge plug setting part at the bottom of the perforating instrument is set to seal the wellbore.

[0222] Bridge plug setting is a completion technique used to block a specific section of a wellbore, preventing fluid flow. It is commonly used in oil well workover, perforating, and cementing operations. The principle is to place a special packer in the wellbore, either above or below the area to be blocked. The packer consists of a pipe, gasket, and valve, and controls the flow of fluid by opening and closing the valve.

[0223] During the bridge plug setting operation, packers are placed above and below the target area. Then, valves are controlled to close the packers, preventing fluid flow. This divides the wellbore into sections, facilitating subsequent operations such as perforating, workover, and cementing.

[0224] In some embodiments of the present disclosure, referring to FIG. 21 , step 180 includes:

[0225] Step 1801: The bridge plug is set to ignite the gunpowder in the gunpowder chamber, breaking the first pin in the gunpowder chamber and generating a thrust to push the push cylinder toward the fixed cone, thereby squeezing the rubber cylinder between the push cylinder and the fixed cone, causing the rubber cylinder to seal the wellbore.

[0226] Step 1802: The tapered end of the fixed cone is thrust into the interior of the slips to seal the wellbore with the slips.

[0227] In step 1081 and step 1082, after the gunpowder in the gunpowder chamber is ignited, the high-energy gas generated by the combustion enters the annulus through the channel, the first pin breaks first due to the smaller shear force, the gas pushes the push cylinder to move downward (the gunpowder chamber connects the release handle and the core shaft, and the core shaft has a tendency to move relatively upward), and the fixed cone also moves downward; since the sealing head is fixedly connected to the core shaft, the sealing head moves upward relative to the slip, pushing the slip for sealing; at the same time, after the slip is sealed, the rubber cylinder is squeezed by the fixed cone and the push cylinder for secondary sealing.

[0228] Step 1803: The second pin in the release handle at the lower part of the powder chamber is broken by thrust, so that the bridge plug is set and separated from the perforating instrument, wherein the shear force of the first pin breaking is smaller than the shear force of the second pin breaking.

[0229] In some embodiments of the present disclosure, referring to FIG. 22 , step 180 further includes:

[0230] Step 1804: The elastic claws inside the rubber cartridge are clamped on the clamping groove of the fixing cone by thrust to fix the rubber cartridge after setting. The perforating gun and the bridge plug setting part are made of soluble alloy material.

[0231] After the rubber cartridge and slips are set, the remaining high-energy gas pushes the pusher and elastic claws. The claws, under the thrust, compress inward along the inclined surface in contact with the retaining cone while simultaneously moving downward, completely setting the rubber cartridge without rebounding and causing setting failure. After all setting operations are complete, the pusher can no longer move downward, and the second pin connecting the release arm to the powder chamber breaks, completing the release arm. The setting operation is complete. During subsequent fracturing operations, the release arm and pusher in the setting tool are pulled downward by the fracturing pressure, resulting in a more effective setting effect.

[0232] To further illustrate this solution, referring to FIG. 23 and FIG. 24 , the present disclosure also provides a specific application example of a perforating method based on a cable-free connection.

[0233] S1: Determine the diameter of the oil and gas well to select the appropriate perforating tool.

[0234] According to the perforation operation requirements, determine the depth of the well and the density of the downhole fluid, modify the chip information according to the parameters, and adjust the chip positioning depth.

[0235] S2: Descend to the perforation depth.

[0236] After assembling all components of the perforator, checking the chip parameter settings, and securing the tool string, the perforator is lowered into the oil and gas well through the wellhead assembly. During the lowering process, in the vertical well section, the perforator automatically descends under the influence of gravity. The electromagnetic deceleration unit is used to stabilize the perforator's descent velocity. After the CCL detects the perforating position (using magnetic positioning technology to provide real-time control of the perforator's descent position), the perforator is initially positioned and the perforating operation begins. If perforating is required in the horizontal section, after entering the horizontal section, the perforator sinks to the bottom of the well due to gravity. The gyroscope detects the perforator's attitude and sends a signal, which, through the chip, adjusts the magnetic force of the two opposing electromagnets on the electromagnet assembly, neutralizing the electromagnet near the bottom and increasing the magnetic force of the electromagnet near the top of the well casing. Finally, under the action of buoyancy and the suction force provided by the electromagnet near the top of the casing, a balance is reached with the weight of the perforator itself; the perforator is suspended in the center of the casing, and then uses the power provided by the propeller to move forward to reach the designated position.

[0237] Specifically, referring to Figure 24, when the descent speed is greater than 4m / s, the electromagnet mechanism circuit of the electromagnetic deceleration unit is first closed to increase the electromagnet mechanism circuit current, thereby increasing the electromagnet magnetic force to reduce the descent speed of the perforator. On the contrary, when the descent speed is too slow, the above operation is reversed to increase the descent speed of the perforator. When the predetermined perforating operation depth is reached, a CCL signal is issued, and the position of the perforator is adjusted by the propeller for precise positioning.

[0238] S3: Set the bridge plug and perform perforating operations.

[0239] After the perforator reaches the designated perforating position, the bridge plug is set. After setting, the perforator's position is adjusted using propeller power, while the CCL ensures the perforator reaches the designated perforating position. After perforating, the perforating gun explodes into soluble fragments, and the pyrotechnic release mechanism is activated, discarding the structure below the pyrotechnic release mechanism.

[0240] S4: Return the perforator to the surface.

[0241] The motor output power increases, which increases the thrust provided by the propeller, pushing the data return device back to the ground, grabbing the fishing head at the wellhead, and completing the operation.

[0242] It's important to note that if the perforator fails to complete its assigned task or an incident occurs underground, the ball-dropping device uses explosives to sever the data transmission line of the data return ball. The ball automatically floats up, carrying the latest data. After being salvaged from the wellhead, it facilitates surface personnel to respond to the underground situation. Alternatively, when the perforator is performing multi-cluster perforation operations, the data return ball serves as data storage and transmission.

[0243] Based on the same inventive concept, the embodiments of the present disclosure also provide a perforating system based on a cableless connection, which can be used to implement the methods described in the above embodiments, such as the following embodiments. Since the principles of solving problems in the perforating system based on a cableless connection are similar to those of the perforating method based on a cableless connection, the implementation of the perforating system based on a cableless connection can refer to the implementation of the perforating method based on a cableless connection, and the repeated parts will not be repeated. As used below, the terms "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0244] The embodiments of the present disclosure provide a specific implementation of a perforating system based on a cableless connection that can implement a perforating method based on a cableless connection. Referring to FIG. 25 , the perforating system based on a cableless connection includes:

[0245] A depth positioning module 10 is used to position the perforator according to pre-acquired wellbore structure data, the magnetic positioning part of the perforator, and the gyroscope, so that the current depth of the perforator is the preset perforating depth;

[0246] The layer perforation module 20 is used to perforate the layer corresponding to the perforation depth through the perforating gun of the perforator;

[0247] A weight reduction module 30 for reducing the weight of the perforating instrument by using a detonation disconnect portion of the perforating instrument;

[0248] The perforating instrument return first module 40 is used to return the perforating instrument to the surface through the thrust provided by the power unit of the perforating instrument, wherein the perforating instrument stores the perforating operation data collected downhole.

[0249] In some embodiments of the present disclosure, referring to FIG. 26 , the depth positioning module 10 includes:

[0250] A primary positioning unit 10a is used to perform primary positioning of the perforating instrument based on the wellbore structure data and the magnetic positioning part of the perforating instrument;

[0251] A download speed determination unit 10b, configured to determine the current descent speed of the perforator according to the gyroscope;

[0252] The secondary positioning unit 10c is used to perform secondary positioning on the perforating instrument according to the current descent speed so that the current depth is the perforating depth.

[0253] In some embodiments of the present disclosure, referring to FIG. 27 , the weight reduction module 30 includes:

[0254] The weight reduction unit 30a is used to detonate the explosive device inside the explosive disconnecting portion and cause it to break, so that the explosive disconnecting portion and the components below it are separated from the perforating instrument.

[0255] In some embodiments of the present disclosure, referring to FIG. 28 , the perforating system based on the cable-free perforating instrument further includes:

[0256] A descent speed control module 40 is used to control the descent speed of the perforator in the wellbore through the power unit and the buoyancy chamber of the perforator;

[0257] The perforating instrument returns to the second module 50, which is used to return the perforating instrument to the surface through the buoyancy provided by the buoyancy chamber.

[0258] In some embodiments of the present disclosure, referring to FIG. 29 , the perforating system based on the cable-free perforating instrument further includes:

[0259] a position adjustment module 60 for controlling the magnetic force between the perforator and the casing through the electromagnetic deceleration unit of the perforator so that the perforator is located on the central axis of the casing;

[0260] The magnetic force elimination module 70 is used to eliminate the magnetic force through the electromagnetic deceleration unit.

[0261] In some embodiments of the present disclosure, in a perforating system based on a cable-free perforating instrument, the perforating instrument includes at least two electromagnetic deceleration parts, which are respectively located at the top and the bottom of the perforating instrument; referring to FIG30 , the perforating system based on the cable-free perforating instrument further includes:

[0262] The magnetic force adjustment module 80 is used to adjust the magnetic force exerted on the perforator in the casing through two electromagnetic deceleration parts when the perforating well section is a horizontal well section, so that the perforator is located on the central axis of the casing.

[0263] In some embodiments of the present disclosure, referring to FIG31 , the perforating system based on the cable-free perforating instrument further includes:

[0264] The wellbore setting module 90 is used to set the wellbore through the bridge plug setting part at the bottom of the perforating instrument.

[0265] In some embodiments of the present disclosure, referring to FIG. 32 , the wellbore setting module 90 includes:

[0266] The primary setting unit 90a is used to ignite the gunpowder inside the gunpowder chamber of the bridge plug setting device, breaking the first pin inside the gunpowder chamber and generating a thrust to push the push tube toward the fixed cone, thereby squeezing the rubber tube between the push tube and the fixed cone and setting the rubber tube into the wellbore.

[0267] The secondary setting unit 90b is used to push the tapered end of the fixed cone into the interior of the slips through thrust, so that the slips can be set to seal the wellbore;

[0268] The bridge plug detaching unit 90c is used to break the second pin in the release handle at the lower part of the gunpowder chamber by thrust, so as to set the bridge plug and detach it from the perforating instrument, wherein the shear force of the first pin breaking is smaller than the shear force of the second pin breaking.

[0269] In some embodiments of the present disclosure, referring to FIG. 33 , the wellbore setting module 90 further includes:

[0270] The rubber cartridge fixing unit 90d is used to clamp the elastic claws inside the rubber cartridge on the clamping groove of the fixing cone through thrust to fix the rubber cartridge after setting. The perforating gun and the bridge plug setting part are made of soluble alloy material.

[0271] As can be seen from the above description, an embodiment of the present disclosure provides a perforating system based on a cable-free connection, comprising: a depth positioning module for positioning the perforating instrument based on pre-acquired wellbore structure data, a magnetic positioning unit of the perforating instrument, and a gyroscope, so that the current depth of the perforating instrument is a preset perforating depth; a layer perforating module for perforating a layer corresponding to the perforating depth using a perforating gun of the perforating instrument; a weight reduction module for reducing the weight of the perforating instrument using a detonation disconnection unit of the perforating instrument; and a perforating instrument return first module for returning the perforating instrument to the surface using a thrust provided by a power unit on the perforating instrument, wherein the perforating instrument stores perforating operation data collected downhole.

[0272] The present disclosure innovatively proposes a perforating system that performs perforating operations in a cable-free manner, which can replace conventional cable-connected or coiled tubing-transported downhole perforating completion operations. It has the advantages of low operating costs and high completion efficiency, and solves the problems of traditional perforating technology, such as cumbersome and time-consuming operations, high operating costs, and the inability to perform continuous fracturing operations.

[0273] The present disclosure also provides a specific implementation of an electronic device capable of implementing all steps of the perforating method based on cableless connection in the above embodiment. Referring to FIG. 34 , the electronic device specifically includes the following contents:

[0274] Electronic device 600 may also include: a communication module 110, an input unit 120, an audio processing unit 130, a display 160, and a power supply 170. It is worth noting that electronic device 600 does not necessarily include all of the components shown in FIG34 ; furthermore, electronic device 600 may also include components not shown in FIG34 , for which reference may be made to the prior art. It is worth noting that this figure is illustrative only; other types of structures may be used to supplement or replace this structure to implement telecommunication or other functions.

[0275] As shown in FIG. 34 , the processor 100 , sometimes also referred to as a controller or operation control, may include a microprocessor or other processor device and / or logic device. The processor 100 receives input and controls the operation of various components of the electronic device 600 .

[0276] Memory 140 may be, for example, one or more of a cache, flash memory, a hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned failure-related information and may also store a program for executing the relevant information. Processor 100 may execute the program stored in memory 140 to implement information storage or processing.

[0277] Input unit 120 provides input to processor 100. Input unit 120 is, for example, a keypad or touch input device. Power supply 170 is used to provide power to electronic device 600. Display 160 is used to display objects such as images and text. Display 160 can be, for example, an LCD display, but is not limited thereto.

[0278] The memory 140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), or a SIM card. Alternatively, it may be a memory that retains information even when power is off, can be selectively erased, and is provided with more data. Examples of memory 140 are sometimes referred to as EPROMs. The memory 140 may also be some other type of device. The memory 140 includes a buffer 141 (sometimes referred to as a buffer memory). The memory 140 may include an application / function storage unit 142 for storing application programs and function programs or processes for executing the operation of the electronic device 600 via the processor 100.

[0279] The memory 140 may also include a data storage unit 143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 144 of the memory 140 may include various driver programs for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0280] The communication module 110 includes a transmitter / receiver for transmitting and receiving signals via an antenna 111. The communication module 110 is coupled to the processor 100 to provide input signals and receive output signals, which may be the same as in the case of a conventional mobile communication terminal.

[0281] Based on different communication technologies, multiple communication modules 110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module, and / or a wireless local area network module. The communication module 110 is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide audio output via the speaker 131 and receive audio input from the microphone 132, thereby implementing common telecommunication functions. The audio processor 130 may include any suitable buffer, decoder, amplifier, etc. Furthermore, the audio processor 130 is coupled to the processor 100, enabling local recording via the microphone 132 and playback of stored audio via the speaker 131.

[0282] Each embodiment of this disclosure is described in a progressive manner. Similar portions between embodiments can be referenced across them. Each embodiment focuses on the differences between the other embodiments. In particular, the hardware + program embodiments are generally similar to the method embodiments, so their description is relatively simple. For relevant portions, refer to the description of the method embodiments.

[0283] The foregoing description describes specific embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0284] Although the present disclosure provides method operation steps such as embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative work. The order of steps listed in the embodiments is only one way of executing the steps among many steps and does not represent the only execution order. When an actual device or client product is executed, it can be executed in the order shown in the embodiments or the drawings or in parallel (for example, in a parallel processor or multi-threaded processing environment).

[0285] Although the embodiments of the present disclosure provide method operation steps such as the embodiments or flow charts, more or fewer operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent a unique execution order. When the device or terminal product in practice is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, an environment of a parallel processor or multi-threaded processing, or even a distributed data processing environment). The term "comprise", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or equipment including a series of elements includes not only those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, product or equipment. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or equipment including the elements.

[0286] For the convenience of description, the above devices are described in terms of functions divided into various modules. Of course, when implementing the embodiments of the present disclosure, the functions of each module can be implemented in the same or multiple software and / or hardware, or the modules that implement the same function can be implemented by a combination of multiple sub-modules or sub-units, etc. The device embodiments described above are merely schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0287] Those skilled in the art will also appreciate that, in addition to implementing the controller in pure computer-readable program code, it is entirely possible to implement the same functionality by logically programming the method steps in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, embedded microcontrollers, and the like. Therefore, such a controller can be considered a hardware component, and the devices included therein for implementing various functions can also be considered structures within the hardware component. Alternatively, the devices for implementing various functions can be considered both software modules implementing the method and structures within the hardware component.

[0288] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0289] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0290] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0291] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0292] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0293] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0294] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the embodiments of the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the embodiments of the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0295] The disclosed embodiments may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, and the like that perform specific tasks or implement specific abstract data types. The disclosed embodiments may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communications network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0296] The various embodiments in this disclosure are described in a progressive manner. Similar or identical parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments. In particular, since the system embodiments are generally similar to the method embodiments, the description is relatively simple. For relevant parts, reference can be made to the partial description of the method embodiments. In the description of this disclosure, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the disclosed embodiments. In this disclosure, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate the different embodiments or examples described in this disclosure, as well as features of different embodiments or examples, without conflict.

[0297] The foregoing is merely an example of the embodiments of the present disclosure and is not intended to limit the embodiments of the present disclosure. It will be apparent to those skilled in the art that various modifications and variations may be made to the embodiments of the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure shall be included within the scope of the claims of the embodiments of the present disclosure.

Claims

1. A perforator based on cable-free connection, characterized in that, The wellbore depth from top to bottom sequentially includes: a data return section, an electromagnetic deceleration section, a detonation disconnection section, and a perforating gun; wherein: The data return section is used to collect downhole perforation operation data, and the data return section at least includes a power section for providing power for the logging-while-perforating tool to return to the surface after the perforation operation. The electromagnetic deceleration section is used to control the magnetic force of the casing on the logging-while-perforating tool and adjust the position of the logging-while-perforating tool in the horizontal well section. The detonation disconnection section is used to initiate detonation after the perforation operation to disconnect the detonation disconnection section and the perforating gun. The perforating gun is used to shoot the perforating charges inside it into the formation.

2. The perforating instrument according to claim 1, characterized in that, The power section includes a propeller, a motor, a gyroscope, and a battery. The detonation disconnection section further includes: a magnetic positioning section for performing a primary positioning of the logging-while-perforating tool in the wellbore. The power section is further used to perform a secondary positioning of the logging-while-perforating tool through the gyroscope after the primary positioning.

3. The perforating instrument according to claim 2, characterized in that, The battery at least includes two parts, and at least one part of the battery is arranged below the detonation disconnection section.

4. The perforating instrument according to any one of claims 1 to 3, characterized in that It further includes: A fishing head is arranged on the upper part of the data return section for fishing the logging-while-perforating tool. A buoyancy chamber is arranged on the upper part of the electromagnetic deceleration section for reducing the descending speed of the logging-while-perforating tool in the wellbore and providing power for the logging-while-perforating tool to return to the surface.

5. The perforating instrument according to any one of claims 1 to 3, characterized in that, The perforating gun includes: a perforating gun body and a bridge plug setting section, wherein: The bridge plug setting section is arranged at the lower part of the perforating gun body for setting the bridge plug on the formation. The perforating gun body and the bridge plug setting section are made of a soluble alloy material.

6. The perforating instrument according to claim 5, wherein, The bridge plug setting section includes: A gunpowder chamber: arranged at the bottom of the perforating gun for providing setting power, and a first pin is arranged inside. A release joint is arranged below the gunpowder chamber and is provided with a second pin, and the second pin is used to disconnect the bridge plug setting from the logging-while-perforating tool. The shear force at which the first pin breaks is less than the shear force at which the second pin breaks. A push cylinder is sleeved outside the gunpowder chamber and the release joint. A rubber cylinder is arranged below the push cylinder for plugging the wellbore. A fixed cone is arranged below the rubber cylinder for cooperating with the push cylinder to squeeze the rubber cylinder, and the end of the fixed cone facing the bottom of the well is conical. A slip is sleeved on the conical part of the fixed cone for plugging the wellbore.

7. The perforating instrument according to claim 6, wherein The bridge plug setting section further includes: Elastic claws are arranged inside the rubber cylinder, and the end facing the bottom of the well is a claw structure, and the claw structure is used to cooperate with the card slot of the fixed cone to fix the rubber cylinder after setting.

8. A perforation method applied to the perforator based on cableless connection according to any one of claims 1 to 7, characterized in that, It includes: The magnetic positioning section and the gyroscope of the logging-while-perforating tool perform positioning on the logging-while-perforating tool according to the pre-acquired wellbore structure data, so that the current depth of the logging-while-perforating tool is a preset perforating depth. The perforating gun of the logging-while-perforating tool perforates the layer corresponding to the perforating depth. The detonation disconnection section of the logging-while-perforating tool reduces the weight of the logging-while-perforating tool. The power section on the logging-while-perforating tool provides thrust to make the logging-while-perforating tool return to the surface, and the logging-while-perforating tool stores the perforation operation data collected downhole.

9. The perforating method according to claim 8, wherein The magnetic positioning part and the gyroscope of the perforator locate the perforator according to the pre-acquired wellbore structure data, so that the current depth of the perforator is the preset perforation depth, including: Performing a primary positioning of the perforator according to the wellbore structure data and the magnetic positioning part of the perforator; The magnetic positioning part of the perforator performs a primary positioning of the perforator according to the wellbore structure data; The gyroscope determines the current descending speed of the perforator; The magnetic positioning part performs a secondary positioning of the perforator according to the current descending speed, so that the current depth is the perforation depth.

10. The perforation method according to claim 8, characterized in that, The detonating disconnecting part of the perforator reduces the weight of the perforator, including: The detonating disconnecting part detonates the pyrotechnic release in it and causes it to break, so that the detonating disconnecting part and the components below it are separated from the perforator.

11. The perforation method according to claim 8, wherein Before the magnetic positioning part and the gyroscope of the perforator locate the perforator according to the pre-acquired wellbore structure data, so that the current depth of the perforator is the preset perforation depth, it further includes: The power part and the buoyancy chamber of the perforator control the descending speed of the perforator in the wellbore; After the detonating disconnecting part of the perforator reduces the weight of the perforator, it further includes: The buoyancy chamber provides buoyancy to enable the perforator to return to the ground.

12. The perforation method according to claim 8, characterized in that, Before the perforating gun of the perforator perforates the formation corresponding to the perforation depth, it further includes: The electromagnetic deceleration part of the perforator controls the magnetic force between the perforator and the casing, so that the perforator is located on the central axis of the casing; After the perforating gun of the perforator perforates the formation corresponding to the perforation depth, it further includes: The electromagnetic deceleration part eliminates the magnetic force.

13. The perforation method according to any one of claims 8 to 12, characterized in that, The perforator includes at least two electromagnetic deceleration parts, which are respectively located at the top and bottom of the perforator; the perforation method further includes: When the perforation interval is a horizontal well section, the two electromagnetic deceleration parts adjust the magnetic force received by the perforator in the casing, so that the perforator is located on the central axis of the casing.

14. The perforation method according to any one of claims 8 to 12, characterized in that, Before the perforating gun of the perforator perforates the formation corresponding to the perforation depth, it further includes: The bridge plug setting part at the bottom of the perforator sets the wellbore.

15. The perforating method according to claim 14, wherein The bridge plug setting part at the bottom of the perforator sets the wellbore, including: The bridge plug setting ignites the gunpowder inside the gunpowder chamber, causes the first pin inside the gunpowder chamber to break, and generates a thrust to push the push tube towards the fixed cone direction, so as to squeeze the rubber cylinder between the push tube and the fixed cone, and make the rubber cylinder set the wellbore; One end of the fixed cone with a conical shape enters into the slips through the thrust, so as to make the slips set the wellbore; The second pin in the release at the lower part of the gunpowder chamber breaks through the thrust, so that the bridge plug setting is separated from the perforator, wherein the shearing force for the first pin to break is less than the shearing force for the second pin to break.

16. The perforation method according to claim 15, characterized in that, The bridge plug setting part at the bottom of the perforator sets the wellbore, and further includes: The elastic claws inside the rubber cylinder are stuck on the card slots of the fixed cone through the thrust to fix the set rubber cylinder, wherein the perforating gun and the bridge plug setting part are made of a soluble alloy material.

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