A combined core barrel

Abstract

The present invention discloses a combined coring gun, belonging to the technical field of oil exploration. The present invention includes: a selective firing control sub, the selective firing control sub includes an outer cylinder of the control sub and an inner cylinder of the control sub, the inner cylinder of the control sub is sleeved inside the outer cylinder of the control sub and a plug for docking with a completion instrument is fixed at its top end, and a control module is fixed on the inner wall of the middle part of the inner cylinder of the control sub; a plurality of intermediate coring gun subs, an end coring gun sub, a plurality of coring mechanisms and an end cap, and the plurality of coring mechanisms are axially installed at intervals on the middle part of the outer side walls of the end coring gun sub and each intermediate coring gun sub; the control module is connected to the plug, each of the intermediate coring gun subs, the end coring gun sub and each of the coring mechanisms through wires. By the detachable connection between a plurality of subs, the present invention increases the number of coring mechanisms, thereby increasing the number of cores taken each time when going downhole, reducing the number of times of going downhole, and shortening the time for taking cores downhole.

Description

Technical Field

[0001] The present invention relates to the technical field of oil exploration, and more specifically, to a combined coring gun. Background Art

[0002] During the process of oil exploration, coring refers to the process of taking rock samples from the drilled formation in order to understand the formation geology. The coring process includes sidewall coring and drilling coring. For drilling coring, there are two coring methods: one is that a hollow drill bit is connected to a drill string through a core barrel. The formation core sample drilled by the hollow drill bit enters the core barrel. After the core barrel is full, all the drill pipes, drill strings, core barrels, and the hollow drill bit are lifted out to the ground, the core barrel is replaced, and then the well is drilled again for coring; the other is for a very shallow well, the core barrel is lowered into the drill pipe (commonly known as the water eye) through a wire rope, the drill string is docked with the hollow drill bit. When the core barrel is full, the wire rope is directly lifted to lift the core barrel to the ground, the core barrel is replaced, and then the well is drilled again. Regardless of which drilling coring method is used, the core barrel needs to enter the well vertically to the ground for coring. Each time of coring obtains few samples, the coring time is long, and the cost is high.

[0003] Sidewall coring is applied to the completion of sandstone and mudstone wells. For the coring interval (measurement interval), the drill string and drill pipes need to be lifted out of the wellhead in advance. That is to say, the coring interval must be in a barehole state. During the logging operation, the wellbore must be kept stable, and a special mixture (commonly known as mud) is filled in the well to balance the formation pressure. This mud is mainly composed of barite powder, chemical agents, and water. Due to the existence of voids in the formation, a paste (commonly known as mud) is formed on the formation surface (wellbore). Since the stable period (commonly known as the shelf life) of the mud is time-limited, when the time approaches / exceeds, the wellbore is extremely prone to collapse or necking, resulting in the instrument being stuck. In addition, sidewall coring is the last one in the open-hole logging project, and the long-term downhole operation increases the downhole safety risk. In the prior art, the set number of coring bullets of the coring gun is different, including 36, 40, or 60, but the number of coring each time is small. In order to complete the coring task, it is necessary to go down the well multiple times to complete the task, and the coring operation time is long. Therefore, how to increase the number of coring, reduce the number of times of going down the well, and shorten the well occupation time are problems that those skilled in the art need to solve urgently. Summary of the Invention

[0004] In view of this, the present invention aims to provide a combined coring gun to at least solve one of the above technical problems in the prior art to a certain extent.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A combined coring gun, comprising:

[0007] Selective firing control sub - section, the selective firing control sub - section includes a control sub - section outer cylinder and a control sub - section inner cylinder. The control sub - section inner cylinder is sleeved inside the control sub - section outer cylinder, and a plug for docking with well - completion instruments is fixed at its top end. A control module is fixed on the inner wall of the middle part of the control sub - section inner cylinder;

[0008] Multiple intermediate core - sampling gun sub - sections, multiple said intermediate core - sampling gun sub - sections are coaxially arranged with the control sub - section outer cylinder and are detachably connected in sequence. The intermediate core - sampling gun sub - section near one end of the control sub - section outer cylinder is detachably connected to the end of the control sub - section outer cylinder away from the plug;

[0009] End core - sampling gun sub - section, the end core - sampling gun sub - section is coaxially arranged with the intermediate core - sampling gun sub - section and one end is detachably connected to the other end of the intermediate core - sampling gun sub - section away from the control sub - section outer cylinder;

[0010] Multiple core - sampling mechanisms, multiple said core - sampling mechanisms are axially installed at intervals on the middle part of the outer side walls of the end core - sampling gun sub - section and each intermediate core - sampling gun sub - section;

[0011] End cap, the end cap is detachably connected to the end of the end core - sampling gun sub - section away from the intermediate core - sampling gun sub - section;

[0012] The control module is connected to the plug, each intermediate core - sampling gun sub - section, the end core - sampling gun sub - section and each core - sampling mechanism through wires.

[0013] Through the above - mentioned technical solution, the selective firing control sub - section, the intermediate core - sampling gun sub - sections and the end core - sampling gun sub - section are connected in sequence to form a complete core - sampling gun. The control module installed in the selective firing control sub - section controls the down - hole operation of the core - sampling gun. The form of combining multiple intermediate core - sampling gun sub - sections and the end core - sampling gun increases the number of core - sampling mechanisms, thereby increasing the core - sampling quantity, reducing the number of trips into the well, and shortening the time for down - hole core - sampling.

[0014] Preferably, the control sub - section inner cylinder includes a fixed cylinder, a shock - absorbing cylinder and a positioning cylinder. The fixed cylinder is sleeved on the inner wall of the control sub - section outer cylinder near the end of the plug. The plug is fixed to one end of the fixed cylinder. A transformer is fixed on the inner side wall of the other end of the fixed cylinder. The transformer is connected to the plug through a wire. One end of the shock - absorbing cylinder is detachably connected to the end of the fixed cylinder away from the plug. The control module is fixedly installed on the inner side wall of the shock - absorbing cylinder. One end of the positioning cylinder is connected to the other end of the shock - absorbing cylinder, and a first multi - core plug is fixed on the inner wall of its lower end. The input end of the first multi - core plug is connected to the control module through a wire.

[0015] The transformer can convert the ground voltage into the required power supply. Through the above structure, the transformer and the plug control block can be fixed, and the fixing cylinder, the shock-absorbing cylinder and the positioning cylinder are detachably connected. The structure is firmly assembled and convenient for installation and disassembly, which is convenient for maintenance.

[0016] Preferably, it further includes a clamping ring. A first annular groove is formed on the outer wall of the fixing cylinder away from one end of the plug. A second annular groove is formed on the outer wall of the shock-absorbing cylinder close to one end of the fixing cylinder. A first annular protrusion is formed on the inner side wall of one end of the clamping ring close to the fixing cylinder, and the first annular protrusion is embedded and installed in the first annular groove. A second annular protrusion is formed on the inner side wall of the other end of the clamping ring, and the second annular protrusion is embedded and installed in the second annular groove.

[0017] The fixing cylinder and the shock-absorbing cylinder are connected together through the clamping ring.

[0018] Preferably, the positioning cylinder includes a storage cylinder and a positioning sleeve. One end of the storage cylinder is connected to the other end of the shock-absorbing cylinder. One end of the positioning sleeve is connected to the other end of the storage cylinder, and a positioning block is fixed to the other end thereof. The positioning block is fixed to the inner side wall of the outer cylinder of the control short joint through a first positioning screw; the first multi-core plug is fixed to the inner side wall of the positioning sleeve.

[0019] The positioning sleeve facilitates the positioning and installation of the first multi-core plug, and the first positioning block facilitates the fixing of the positioning sleeve to the outer cylinder of the control short joint.

[0020] Preferably, both the intermediate core-taking gun short joint and the end core-taking gun short joint include a connector assembly, an upper connecting cylinder and a core-taking short joint body. A first multi-core socket is fixed to the inner side wall of the upper end of the connector assembly. The upper connecting cylinder is detachably connected to the outer side wall of the lower end of the connector assembly. The core-taking short joint body is in a columnar structure and a first installation groove with an upward opening is formed at the top thereof. The inner side wall of the first installation groove is detachably connected to the lower end of the upper connecting cylinder; a second installation groove with a downward opening is formed at the bottom end of the core-taking short joint body; a plurality of ballistic holes arranged radially along the core-taking short joint body are axially spaced and distributed in the middle of the outer side wall of the core-taking short joint body. The core-taking mechanisms are slidably installed in the plurality of ballistic holes one by one and are connected to the outer side wall in the middle of the core-taking short joint body through steel wires;

[0021] Among them, the intermediate core sampling gun short joint further includes a lower connecting cylinder. One end of the lower connecting cylinder is connected to the inner side wall of the corresponding second installation groove, and a second multi-core plug is fixed on the inner side wall of the other end. One end of the connector assembly of the intermediate core sampling gun short joint close to the first multi-core socket is detachably connected to the inner side wall of the control short joint outer cylinder close to one end of the first multi-core plug, and the first multi-core plug can be electrically plugged into the first multi-core socket. One end of the connector assembly of the end core sampling gun short joint close to its first multi-core socket is detachably connected to the inner side wall of the lower connecting cylinder, and its first multi-core socket can be electrically plugged into the second multi-core plug. The inner side wall of the second installation groove of the end core sampling gun short joint is connected to the top end of the end cap.

[0022] Both the intermediate core sampling gun short joint and the end core sampling gun short joint are detachably connected by multiple structures, which is convenient for installation and disassembly and convenient for maintenance.

[0023] Preferably, the connector assembly structure includes a double-headed connecting cylinder, a first screw sleeve assembly and a second screw sleeve assembly. A first multi-core socket is fixed on the inner side wall of the top end of the double-headed connecting cylinder. A fixed protrusion is formed in the middle of the outer wall of the double-headed connecting cylinder. The first screw sleeve assembly is sleeved on the outer side wall of the upper end of the double-headed connecting cylinder and its bottom end abuts against the fixed protrusion. The second screw sleeve assembly is symmetrically arranged with the first screw sleeve assembly about the center of the fixed protrusion and is sleeved on the outer side wall of the lower end of the double-headed connecting cylinder. Its upper end abuts against the lower end face of the fixed protrusion, and the second screw sleeve assembly is detachably connected to the inner side wall of the top end of the upper connecting cylinder.

[0024] Among them, the top end of the double-headed connecting cylinder of the intermediate core sampling gun short joint is detachably connected to the inner side wall of the control short joint outer cylinder close to one end of the first multi-core plug, and the double-headed connecting cylinder of the end core sampling gun short joint is detachably connected to the inner side wall of the lower connecting cylinder of the intermediate core sampling gun short joint.

[0025] The detachable connection between each short joint is realized through the double-headed connecting cylinder and the first screw sleeve assembly, and the detachable connection between the double-headed connecting cylinder and the upper connecting cylinder is realized through the second screw sleeve assembly.

[0026] Preferably, the first screw sleeve assembly and the second screw sleeve assembly have the same structure and both include an external thread sleeve and a screw sleeve fixing component. The external thread sleeve is sleeved on the outer side wall of the double-headed connecting cylinder. A screw sleeve protrusion is formed on the outer side wall of one end of the external thread sleeve, and an external thread is provided on the outer side wall of the other end. The screw sleeve protrusion abuts against the fixed protrusion. An annular placement groove is formed on the outer side wall of the double-headed connecting cylinder close to the external thread end of the external thread sleeve. The screw sleeve fixing component is sleeved in the annular placement groove and abuts against the end of the external thread sleeve close to the external thread to lock and fix the external thread sleeve.

[0027] Detachable connection is achieved through threaded connection, which is convenient for disassembly and assembly. The outer threaded sleeve is fixed by the sleeve fixing assembly to ensure relative static between the outer threaded sleeve and the double-headed connection cylinder without rotation.

[0028] Preferably, the sleeve fixing assembly includes a fixing ring, a disassembling ring and a snap ring. The fixing ring is connected to one end of the inner side wall of the annular placement groove close to the outer threaded sleeve. A clamping protrusion is formed on the outer side wall of the end of the fixing ring away from the outer threaded sleeve, and the clamping protrusion abuts against one end of the outer threaded sleeve close to its external thread. The disassembling ring is connected to one end of the inner side wall of the annular placement groove away from the outer threaded sleeve, and one end thereof abuts against the end of the fixing ring away from the outer threaded sleeve, and the other end abuts against the other end of the annular placement groove away from the outer threaded sleeve. The snap ring is sleeved on the outer side wall of the disassembling ring. The outer threaded sleeve is fixed by the fixing ring, the disassembling ring is used to fix the fixing ring, and the snap ring is used to fix the disassembling ring.

[0029] Preferably, a pressure-bearing assembly is fixed in the upper connection cylinder. The pressure-bearing assembly includes a pressure-bearing disc and a wiring terminal assembly. The pressure-bearing disc is of a columnar structure, and a through hole is axially opened in the middle thereof. A wiring terminal assembly is connected in the through hole. The input end of the wiring terminal assembly is connected to the first multi-core socket through a wire, and its output end is connected to the core-taking mechanism through a wire. The output end of the wiring terminal assembly in the middle core-taking gun short section is also connected to the second multi-core plug through a wire.

[0030] The pressure-bearing assembly is used to fix the wire.

[0031] Preferably, a pressure-bearing disc positioning block is fixed at the top of the pressure-bearing disc. A positioning groove is opened on the outer side wall of the end of the double-headed connection cylinder away from the first multi-core socket. The pressure-bearing disc positioning block is inserted into the positioning groove and fixed by a second positioning screw.

[0032] The pressure-bearing disc positioning block facilitates the positioning of the pressure-bearing disc and its fixation to the upper connection cylinder.

[0033] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a combined core-taking gun. By combining and connecting multiple short sections, the number of core-taking mechanisms is increased, and the core-taking mechanisms are all controlled by a control module to perform core-taking operations simultaneously, increasing the core-taking amount during each downhole operation, reducing the number of downhole trips, thereby shortening the downhole operation time and improving the core-taking efficiency. The short sections are connected by threaded connection, which is convenient for disassembly and assembly, and is convenient for assembly and transportation. The structures within each short section are detachably connected, which is convenient for disassembly and assembly and is convenient for maintenance. Through the insertion and connection of the multi-core plug and the multi-core socket, electrical connection between each short section is achieved, and the docking and disassembly are convenient and efficient. The pressure-bearing assembly is provided to facilitate the fixation and connection of the wire. Structures such as positioning blocks and pressure-bearing disc positioning blocks are provided to facilitate positioning and fixation, saving installation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0035] Figure 1 Schematic structural diagram of a combined coring gun provided by the present invention.

[0036] Figure 2 Schematic full-section structural diagram of the selective firing control sub-section of the present invention.

[0037] Figure 3 Schematic full-section structural diagram of the clamping ring part of the present invention.

[0038] Figure 4 Schematic full-section structural diagram of the first positioning sleeve part of the present invention.

[0039] Figure 5 Partial sectional view structural diagram of the intermediate coring gun sub-section of the present invention.

[0040] Figure 6 Partial sectional view structural diagram of the end coring gun sub-section of the present invention.

[0041] Figure 7 Schematic half-section view of the connection between the first multi-core plug and the first multi-core socket when the selective firing control sub-section and the intermediate coring gun sub-section of the present invention are assembled.

[0042] Figure 8 Schematic half-section view of the connection between the second multi-core plug and the second multi-core socket when the intermediate coring gun sub-section and the end coring gun sub-section of the present invention are assembled.

[0043] Figure 9 Schematic full-section structural diagram of the connector assembly of the present invention.

[0044] Figure 10 Schematic full-section structural diagram of the pressure-bearing assembly structure of the present invention.

[0045] Figure 11 Schematic structural diagram of the selective firing control sub-section of the present invention when a lifting cap and a thread protecting cap are installed.

[0046] Figure 12 Schematic structural diagram of the intermediate coring gun sub-section of the present invention when a lifting cap and a thread protecting cap are installed.

[0047] Figure 13 Schematic structural diagram of the end coring gun sub-section of the present invention when a lifting cap and an end cap are installed.

[0048] Figure 14 For Figure 5 Schematic cross-sectional view of the A-A part in the middle

[0049] 1 Selective firing control sub-section, 2 Intermediate core sampling gun sub-section, 3 End core sampling gun sub-section, 4 End cap, 5 Lifting cap, 6 Sealing ring, 7 Core sampling mechanism, 8 Anti-retreat screw, 9 Steel wire rope, 10 Thread protector cap, 13 Conducting wire

[0050] 101 Outer cylinder of the control sub-section, 1011 First annular positioning groove, 102 Plug-in unit, 103 Fixed cylinder, 104 Transformer, 105 Shock-absorbing cylinder, 106 Storage cylinder, 107 Positioning sleeve, 1071 Positioning block, 108 Control module, 109 First multi-core plug, 110 Clamping ring, 115 First positioning screw;

[0051] 21 First core sampling gun sub-section, 22 Second core sampling gun sub-section;

[0052] 201 Double-headed connecting cylinder, 2011 Fixed protrusion, 2012 Second annular positioning groove, 202 Upper connecting cylinder, 203 Core sampling gun sub-section main body, 204 Lower connecting cylinder, 205 External thread sleeve, 206 Fixed ring, 207 Disassembly ring, 208 Snap ring, 209 Second multi-core plug, 210 First multi-core socket, 211 Pressure-bearing disc, 2111 Pressure-bearing disc positioning block, 212 Terminal assembly, 213 Second positioning screw, 214 Core sampling positioning sleeve, 2141 Core sampling positioning sleeve positioning block, 215 Third positioning screw;

[0053] 701 Core sampling cylinder, 702 Core sampling seat, 703 Exhaust screw, 704 Cartridge, 705 Ignition screw, 706 Fixed nut, 707 First pressure-bearing pad, 708 Sealing pad, 709 Second pressure-bearing pad, 710 Sealing plug, 711 Isolation sheet, 712 Connecting pipe. Specific implementation mode

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0055] Embodiment 1:

[0056] Please refer to Figures 1 - 10 , the embodiment of the present invention discloses a combined core sampling gun, including:

[0057] The selective firing control sub-section 1, the selective firing control sub-section 1 includes an outer cylinder 101 of the control sub-section and an inner cylinder of the control sub-section. The inner cylinder of the control sub-section is sleeved inside the outer cylinder 101 of the control sub-section, and a plug-in unit 102 for docking with the completion instrument is fixed at its top end. A control module 108 is fixed in the middle of the inner wall of the inner cylinder of the control sub-section;

[0058] A plurality of intermediate core sampling gun short joints 2 are coaxially arranged and detachably connected to the control short joint outer cylinder 101 in sequence. The intermediate core sampling gun short joint 2 near one end of the control short joint outer cylinder 101 is detachably connected to the end of the control short joint outer cylinder 101 away from the plug-in unit.

[0059] An end core sampling gun short joint 3 is coaxially arranged with the intermediate core sampling gun short joint 2, and one end is detachably connected to the other end of the intermediate core sampling gun short joint 2 away from the control short joint outer cylinder 101.

[0060] A plurality of core sampling mechanisms 7 are axially spaced and installed in the middle of the outer side walls of the end core sampling gun short joint 3 and each intermediate core sampling gun short joint 2.

[0061] An end cap 4 is detachably connected to the end of the end core sampling gun short joint 3 away from the intermediate core sampling gun short joint 2.

[0062] The control module 108 is connected to the plug-in unit 102, each intermediate core sampling gun short joint 2, the end core sampling gun short joint 3, and each core sampling mechanism 7 through wires 13.

[0063] As Figure 1 shown, the control short joint inner cylinder includes a fixed cylinder 103, a shock-absorbing cylinder 105, and a positioning cylinder. The fixed cylinder 103 is in the shape of a trumpet with a narrow upper part and a wide lower part, and is sleeved on the upper end of the inner wall of the control short joint outer cylinder 101. A plug-in unit 102 is fixed at the top of the fixed cylinder 103. A rectangular installation hole communicating with its inner cavity is opened on the lower side wall of the fixed cylinder 103. During installation, the transformer 104 is placed into the inner cavity of the fixed cylinder 103 from the rectangular installation hole and fixed on the inner side wall of the fixed cylinder 103 by screws. The plug-in unit 102 uses a 31-core socket and is docked with the completion instrument. The transformer 104 is connected to the plug-in unit 102 through a wire 13; the transformer 104 can convert the ground voltage into the required power supply.

[0064] See Figure 3 , the top of the shock-absorbing cylinder 105 is connected to the bottom of the fixed cylinder 103 through a clamping ring 110. A first annular groove is opened on the outer wall at the lower end of the fixed cylinder 103, and a second annular groove is opened on the outer wall at the upper end of the shock-absorbing cylinder 105. A first annular protrusion is formed on the inner side wall at the upper end of the clamping ring 110, and a second annular protrusion is formed on the inner side wall at the lower end of the clamping ring 110. The first annular protrusion is embedded in the first annular groove, and the second annular protrusion is embedded in the second annular groove. The clamping ring 110 is formed by butting two semi-circular rings and is fixedly connected by bolts. The clamping ring 110 connects and fixes the shock-absorbing cylinder 105 and the fixed cylinder 103, and is detachable, which is convenient for installation and disassembly.

[0065] The middle part inside the shock absorber cylinder 105 is a rectangular cavity, and a control module 108 is embedded and installed in the rectangular cavity. The input end of the control module 108 is connected to the transformer 104 through a wire 13. A first connection groove is provided on the outer side wall of the lower end of the shock absorber cylinder 105. The top end of the positioning cylinder is inserted into the first connection groove and fixed by a first screw, and a first multi-core plug 109 is fixed on the inner wall of its lower end. The first multi-core plug 109 uses a 75-core plug, and its input end is connected to the control module 108 through a wire 13.

[0066] See Figure 2 The positioning cylinder includes a storage cylinder 106 and a positioning sleeve 107. One end of the storage cylinder 106 is inserted into the first connection groove and fixed by a screw. One end of the positioning sleeve 107 is connected to the other end of the storage cylinder 106, and a positioning block 1071 is fixed at the other end thereof. A first positioning threaded hole is provided on the positioning block 1071 and is installed on the inner side wall of the control sub-section outer cylinder 101101 through a first positioning screw 115; a stepped positioning protrusion with a stepped reduction in the inner diameter towards one end close to the storage cylinder 106 is formed on the inner side wall of the positioning sleeve 107, and the first multi-core plug 109 is adaptively clamped on the step of the stepped positioning protrusion. The positioning block 1071 can play a positioning role. During installation, the first positioning sleeve 107 is rotated to make the positioning block 1071 rotate to the threaded hole of the selected firing control sub-section 1 outer cylinder, so as to facilitate aligning the first positioning threaded hole with the threaded hole to install the first positioning screw 115. The stepped positioning protrusion facilitates the positioning and installation of the first multi-core plug 109.

[0067] See Figures 5 - 9 The middle core-taking gun sub-section 2 and the end core-taking gun sub-section 3 both include a connector assembly, an upper connecting cylinder 202 and a core-taking gun sub-section main body 203. A first multi-core socket 210 is fixed on the inner side wall of the upper end of the connector assembly. The upper connecting cylinder 202 is detachably connected to the outer side wall of the lower end of the connector assembly. The core-taking gun sub-section main body 203 has a columnar structure and a first installation groove with an upward opening is provided at the top end thereof. The inner side wall of the first installation groove is detachably connected to the lower end of the upper connecting cylinder 202; a second installation groove with a downward opening is provided at the bottom end of the core-taking gun sub-section main body 203; a plurality of ballistic holes arranged radially along the core-taking gun sub-section main body 203 are axially spaced on the middle part of the outer side wall of the core-taking gun sub-section main body 203, and the core-taking mechanisms 7 are slidably installed in the plurality of ballistic holes one by one and are connected to the outer side wall of the middle part of the core-taking gun sub-section main body 203 through steel wires 9;

[0068] Among them, the intermediate core-taking gun short section 2 further includes a lower connecting cylinder 204. One end of the lower connecting cylinder 204 is connected to the inner side wall of the corresponding second installation groove, and the inner side wall of the other end is fixed with a second multi-core plug 209. One end of the connector assembly of the intermediate core-taking gun short section 2 close to the first multi-core socket 210 is detachably connected to the inner side wall of one end of the control short section outer cylinder 101 close to the first multi-core plug 109, and the first multi-core plug 109 can be electrically plugged into the first multi-core socket 210. One end of the connector assembly of the end core-taking gun short section 3 close to its first multi-core socket 210 is detachably connected to the inner side wall of the lower connecting cylinder 204, and its first multi-core socket 210 can be electrically plugged into the second multi-core plug 209. The inner side wall of the second installation groove of the end core-taking gun short section 3 is connected to the top end of the end cap 4.

[0069] See Figure 5 , a core-taking positioning sleeve 214 is fixed on the inner side wall of the lower connecting cylinder 204. A core-taking positioning sleeve positioning block 2141 is fixed at the lower end of the core-taking positioning sleeve 214. A second positioning threaded hole is provided on the core-taking positioning sleeve positioning block 2141, and a lower threaded hole is provided on the side wall of the lower end of the lower connecting cylinder 204. The core-taking positioning sleeve positioning block 2141 is fixed on the inner side wall of the lower end of the lower connecting cylinder 204 through a third positioning screw 215. A second stepped positioning protrusion with a stepped reduction in the inner diameter towards one end close to the core-taking short section main body 203 is formed inside the core-taking positioning sleeve 218. The shape of the second stepped positioning protrusion matches the outer shape of the second multi-core plug 209, so that the second multi-core plug 209 is adaptively clamped on its second stepped positioning protrusion and is not easily detached.

[0070] As Figure 1 shown, in this embodiment, preferably two intermediate core-taking gun short sections 2 are provided, including a first core-taking gun short section 21 and a second core-taking gun short section 22. The connector assembly of the first core-taking gun short section 21 is connected to the control short section outer cylinder 101, and the connector assembly of the second core-taking gun short section 22 is connected to the lower connecting cylinder 204 of the first core-taking gun short section 21. The first multi-core socket 210 of the first core-taking gun short section 21 uses a 75-core socket and is electrically plugged into a 75-core plug. The second multi-core plug 209 of the first core-taking gun short section 21 uses a 51-core plug, and the first multi-core socket 210 of the second core-taking gun short section 22 uses a 51-core socket and is electrically plugged into a 51-core plug. The second multi-core plug 209 of the second core-taking gun short section 22 uses a 28-core plug. The two intermediate core-taking gun short sections 2 can not only increase the number of core-taking mechanisms 7 but also facilitate the control of each core-taking mechanism 7 by the control module 108.

[0071] The upper connecting cylinder 202 and the core-taking short section main body 203, and between the core-taking short section main body 203 and the lower connecting cylinder 204 are all fixed using anti-loosening screws 8.

[0072] A first through hole is formed in the middle of the core barrel body 203. One end of the first through hole communicates with the first installation groove, and the other end communicates with the second installation groove. The first through hole is used for threading the wire 13.

[0073] As Figure 9 shown, the connector assembly structure includes a double-headed connecting cylinder 201, a first screw sleeve assembly, and a second screw sleeve assembly. A first multi-core socket 210 is fixed on the inner side wall of the top end of the double-headed connecting cylinder 201. A fixing protrusion 2011 is formed in the middle of the outer wall of the double-headed connecting cylinder 201. The first screw sleeve assembly is sleeved on the outer side wall of the upper end of the double-headed connecting cylinder 201, and its bottom end abuts against the fixing protrusion 2011; the second screw sleeve assembly is symmetrically arranged with respect to the median line L of the fixing protrusion 2011 and is sleeved on the outer side wall of the lower end of the double-headed connecting cylinder 201. Its upper end abuts against the lower end surface of the fixing protrusion 2011. The second screw sleeve assembly is detachably connected to the inner side wall of the top end of the upper connecting cylinder 202;

[0074] A first annular positioning groove 1011 is formed on the outer side wall of the upper end of the control short barrel. A second annular positioning groove 2012 is formed on the outer side wall of the fixing protrusion 2011. During installation, a disc bracket is clamped at the first annular positioning groove 1011 or the second annular positioning groove 2012. The part of one of the short barrels to be docked located below the clamped disc bracket is placed in the well, and it is erected at the wellhead through the clamped disc bracket to complete the docking with another short barrel.

[0075] The first screw sleeve assembly and the second screw sleeve assembly have the same structure and both include an external thread sleeve 205 and a screw sleeve fixing component. The external thread sleeve 205 is sleeved on the outer side wall of the double-headed connecting cylinder 201. A screw sleeve protrusion is formed on the outer side wall of one end of the external thread sleeve 205, and an external thread is provided on the outer side wall of the other end. The screw sleeve protrusion abuts against the fixing protrusion 2011. An annular placement groove is formed on the outer side wall of the double-headed connecting cylinder 201 near the external thread end of the external thread sleeve 205. The screw sleeve fixing component is sleeved in the annular placement groove and abuts against the end of the external thread sleeve 205 near the external thread to lock and fix the external thread sleeve 205.

[0076] Among them, the external thread sleeve 205 of the first screw sleeve assembly in the first core gun short barrel 21 is threadedly connected to the inner side wall of the control short barrel 101 near one end of the first multi-core plug 109. The external thread sleeve 205 of the first screw sleeve assembly in the second core gun short barrel 22 is threadedly connected to the inner side wall of the lower connecting cylinder 204 of the first core gun short barrel 21. The external thread sleeve 205 of the first screw sleeve assembly in the end core gun short barrel 3 is threadedly connected to the inner side wall of the lower connecting cylinder 204 of the second core gun short barrel 22. The detachable connection between each short barrel is realized through the external thread sleeve 205, which is convenient for its docking and installation.

[0077] The external thread sleeve 205 in the second screw sleeve assembly in each short section is threadedly connected to the inner wall of the top end of its corresponding upper connecting cylinder. The detachable connection between the double-headed connecting cylinder 201 and the upper connecting cylinder 202 is realized through the second screw sleeve assembly.

[0078] As Figure 9 shown, the screw sleeve fixing components in the first screw sleeve assembly and the second screw sleeve assembly are also symmetrically arranged up and down with respect to the median line L of the fixing protrusion 2011. The screw sleeve fixing component includes a fixing ring 206, a disassembling ring 207 and a snap ring 208. The fixing ring 206 is connected to one end of the inner side wall of the annular placement groove close to the external thread sleeve 205. A clamping protrusion is formed on the outer side wall of the fixing ring 206 away from the external thread sleeve 205, and the clamping protrusion abuts against one end of the external thread sleeve 205 close to its external thread. The disassembling ring 207 is connected to one end of the inner side wall of the annular placement groove away from the external thread sleeve 205, and one end thereof abuts against the end of the fixing ring 206 away from the external thread sleeve 205, and the other end abuts against the other end of the annular placement groove away from the external thread sleeve 205. The snap ring 208 is sleeved on the outer side wall of the disassembling ring 207.

[0079] As Figure 10 shown, a pressure-bearing component is fixed inside the upper connecting cylinder 202. The pressure-bearing component includes a pressure-bearing disc 211 and a terminal assembly 212. A first step is provided on the inner wall of the upper connecting cylinder 202, and the pressure-bearing disc 211 is fixed on the first step; the pressure-bearing disc 211 is of a columnar structure, and a through hole is axially opened in the middle thereof. The terminal assembly 212 is connected inside the through hole. The input end of the terminal assembly 212 is connected to the first multi-core socket 210 through a wire 13, and its output end is connected to the core-taking mechanism 7 through a wire 13. The output end of the terminal assembly 212 in the middle core-taking gun short section 2 is also connected to the second multi-core plug 209 through a wire 13. The pressure-bearing component is used for fixing the internal wire 13, and the cooperation between the pressure-bearing disc positioning block 2111 and the positioning groove facilitates the positioning and fixing of the pressure-bearing disc 211.

[0080] An annular placement groove is also opened at the upper end of the outer side wall of the control short section outer cylinder 101, and a third screw sleeve assembly is sleeved on the upper end of its outer side wall. The third screw sleeve assembly has the same structure as the first screw sleeve assembly, and also includes an external thread sleeve 205, a fixing ring 206, a disassembling ring 207 and a snap ring 208. Its specific structural settings are the same as those of the first external thread sleeve and will not be elaborated here. The fixing ring 206 is formed by butting two stepped semi-circular rings and fixed by bolts. The disassembling ring 207 is formed by butting two semi-circular rings. The fixing ring 206 is used for limiting and fixing the external thread sleeve 205, the disassembling ring 207 is used for limiting and fixing the fixing ring 206, and the snap ring 208 is used for locking and fixing the disassembling ring 207 in the annular placement groove.

[0081] At the connection between the outer cylinder 101 of the control nipple and the well completion instrument, at the connection between the outer cylinder 101 of the control nipple and the double-headed connection cylinder 201, at the connection between the double-headed connection cylinder 201 and the upper connection cylinder 202, at the connection between the upper connection cylinder 202 and the core sampling nipple body 203, at the connection between the core sampling nipple body 203 and the lower connection cylinder 204, at the connection between the end cap 4 and the core sampling nipple body 203, and at all screw installation locations, sealing rings 6 are provided. Sealing rings 6 are provided at the connection parts of each part for sealing to prevent mud from entering the inside of the core sampling gun and protect the internal electrical connectors.

[0082] A wire rope 9 is also provided. Along the axial direction of the middle part of the outer side wall of the core sampling nipple body 203, a plurality of ballistic holes are spaced apart. On both sides of each ballistic hole, grooves are symmetrically provided, and a wire rope 9 is placed in each groove. Two through holes are opened on the bottom wall of the groove. The two ends of the wire rope 9 respectively pass through the two through holes and are respectively fixedly connected with a fixing member. The fixing member is in the shape of a monk's head, and the two fixing members are respectively fixed at the two ends of the wire rope, so that the wire rope 9 is fixed on the bottom wall of the groove. A screw rod is passed through the middle of the wire rope 9, and the screw rod is threadedly connected with the core sampling mechanism 7. The core sampling mechanism 7 is convenient to install and can be brought back to the ground together with the core sampling gun under the traction of the wire rope 9 after the core sampling operation is completed.

[0083] Embodiment 2:

[0084] See Figures 11 - 13 , in this embodiment, other structures are the same as those in Embodiment 1. On this basis, a lifting cap 4 and a thread protector cap 5 are also provided. A lifting cap 4 can be sleeved on one end of the outer cylinder 101 of the control nipple close to the plug-in 102 and the top end of the double-headed connection cylinder 201, and a thread protector cap 5 can be inserted and connected to the bottom end of the outer cylinder 101 of the control nipple far from the plug-in 102 and the bottom end of the lower connection cylinder 204. When storing or transporting, the lifting cap 4 and the thread protector cap 5 are installed to protect the internal equipment of each nipple from being damaged. When core sampling operation is required, the lifting cap 4 and the thread protector cap 5 are removed at the core sampling wellhead, and each nipple is sequentially butted to form a complete core sampling gun, and the selective firing control nipple 1 is butted with the well completion instrument to make the core sampling gun enter the well for core sampling.

[0085] Embodiment 3:

[0086] See Figure 14 , in this embodiment, other structures are the same as those in Embodiment 1. In this embodiment, the core sampling mechanism 7 includes a core sampling cylinder assembly and an ignition device. The core sampling cylinder assembly is slidably installed in the ballistic hole. The ignition device is fixed at the bottom end of the ballistic hole, one end abuts against the core sampling cylinder assembly, and the other end is connected with a sealing plug 710. The ignition device is connected to the control module 108 through a wire 13.

[0087] The core barrel assembly includes a core barrel 701 and a core seat 702. The inside of the core barrel 701 is a core chamber, and the diameter of the core chamber decreases step by step in the direction close to the core-taking end, which can make the taken core not easy to come out. The core barrel 701 is symmetrically installed with connecting pipes 712 perpendicular to its outer wall. Each connecting pipe 712 is threadedly installed with a screw rod in a one-to-one correspondence, so that the core barrel 701 is connected to the steel wire rope 99. One end of the core seat 702 is connected to the inner wall of the end of the core barrel 701 away from the core-taking end, and an air vent hole is axially opened in the middle thereof. One end of the air vent hole communicates with the core chamber, and the other end communicates with the ballistic hole. The inner wall of the air vent hole is threadedly connected with an exhaust screw 703.

[0088] The ignition device includes a medicine box 704 and a primer screw 705. The medicine box 704 is placed in the cavity formed by the core seat 702 and the ballistic hole. The main body 203 of the core short joint is provided with a first counterbore, a through hole and a second counterbore along its radial direction. One end of the first counterbore communicates with the ballistic, one end of the through hole communicates with the other end of the first counterbore, and the second counterbore communicates with the other end of the through hole. The primer screw 705 is placed in the through hole, one end of which is connected to the medicine box 704, and the other end is connected to the control module 108 through a wire 13. The exhaust screw 703 is used to discharge the remaining air pressure in the ballistic hole during the installation of the core seat 702, so that the medicine box 704 is in firm contact with the primer screw 705 and the core seat 702. The primer screw 705 allows current to safely enter the medicine box 704, and the gas pressure generated by the combustion of the medicine box 704 impacts the core barrel main body 701 to enter the formation to obtain the core.

[0089] A sealing gasket 708 and a first pressure-bearing gasket 707 are sequentially sleeved on the end of the primer screw 705 close to the medicine box 704, and both the sealing gasket 708 and the first pressure-bearing gasket 707 are located in the first counterbore. A second pressure-bearing gasket 709 is also sleeved on the primer screw 705, and the second pressure-bearing gasket 709 is located in the second counterbore. A fixing nut 706 is threadedly connected to the end of the primer screw 705 away from the medicine box, which is used to lock and fix the primer screw 705. The first pressure-bearing gasket 707 and the second pressure-bearing gasket 709 are used to bear the impact pressure generated when the core barrel 701 is launched.

[0090] Step-shaped sealing holes are opened on the side walls of the first main body 203 or the second main body 303 away from the core barrel 701. The sealing holes communicate with the second counterbore. A sealing plug 710 is fixed in the second sealing hole. A sealing ring 6 is arranged at the stepped connection of the sealing plug 710 and the sealing hole. An isolation groove is opened at one end of the sealing plug 710 close to the primer screw 705, and an isolation piece 711 is placed in the isolation groove. The sealing plug 710 and the sealing ring are used for sealing to prevent mud from entering. The sealing plug 710 is made of 17-4 stainless steel material, so the isolation piece 711 is provided to prevent it from contacting the primer screw 705 and causing a short circuit of the current.

[0091] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0092] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0094] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined core barrel gun, characterized in that, it comprises: A selective firing control sub - section (1), the selective firing control sub - section (1) includes a control sub - section outer cylinder (101) and a control sub - section inner cylinder. The control sub - section inner cylinder is sleeved inside the control sub - section outer cylinder (101), and a plug (102) for docking with a completion instrument is fixed at its top end. A control module (108) is fixed on the inner wall of the middle part of the control sub - section inner cylinder; A plurality of intermediate core barrel gun sub - sections (2), the plurality of intermediate core barrel gun sub - sections (2) are coaxially arranged and detachably connected in sequence with the control sub - section outer cylinder (101). The intermediate core barrel gun sub - section (2) near one end of the control sub - section outer cylinder (101) is detachably connected to the end of the control sub - section outer cylinder (101) away from the plug; An end core barrel gun sub - section (3), the end core barrel gun sub - section (3) is coaxially arranged with the intermediate core barrel gun sub - section (2) and one end is detachably connected to the other end of the intermediate core barrel gun sub - section (2) away from the control sub - section outer cylinder (101); A plurality of core - taking mechanisms (7), the plurality of core - taking mechanisms (7) are axially installed at intervals on the middle part of the outer side walls of the end core barrel gun sub - section (3) and each intermediate core barrel gun sub - section (2); An end cap (4), the end cap (4) is detachably connected to the end of the end core barrel gun sub - section (3) away from the intermediate core barrel gun sub - section (2); The control module (108) is connected to the plug (102), each intermediate core barrel gun sub - section (2), the end core barrel gun sub - section (3) and each core - taking mechanism (7) through wires (13); The control sub - section inner cylinder includes a fixed cylinder (103), a shock - absorbing cylinder (105) and a positioning cylinder. The fixed cylinder (103) is sleeved on the inner wall of the control sub - section outer cylinder (101) near one end of the plug (102), and the plug (102) is fixed to one end of the fixed cylinder (103); A transformer (104) is fixed on the inner side wall of the other end of the fixed cylinder (103), and the transformer (104) is connected to the plug (102) through a wire (13); One end of the shock - absorbing cylinder (105) is detachably connected to the end of the fixed cylinder (103) away from the plug (102), and the control module (108) is fixedly installed on the inner side wall of the shock - absorbing cylinder (105); One end of the positioning cylinder is connected to the other end of the shock - absorbing cylinder (105), and a first multi - core plug (109) is fixed on the inner wall of its lower end. The input end of the first multi - core plug (109) is connected to the control module (108) through a wire (13).

2. The combined core barrel gun according to claim 1, characterized in that, It further includes a clamping ring (110). A first annular groove is formed on the outer wall of one end of the fixed cylinder (103) away from the plug-in (102). A second annular groove is formed on the outer wall of one end of the shock-absorbing cylinder (105) close to the fixed cylinder (103). A first annular protrusion is formed on the inner side wall of one end of the clamping ring (110) close to the fixed cylinder (103), and the first annular protrusion is embedded and installed in the first annular groove. A second annular protrusion is formed on the inner side wall of the other end of the clamping ring (110), and the second annular protrusion is embedded and installed in the second annular groove.

3. The combined core barrel according to claim 1, characterized in that the positioning cylinder includes a storage cylinder (106) and a positioning sleeve (107). One end of the storage cylinder (106) is connected to the other end of the shock-absorbing cylinder (105). One end of the positioning sleeve (107) is connected to the other end of the storage cylinder (106), and a positioning block (1071) is fixed to the other end thereof. The positioning block (1071) is fixed to the inner side wall of the outer cylinder of the control sub-section (101) by a first positioning screw (115); the first multi-core plug (109) is fixed to the inner side wall of the positioning sleeve (107).

4. The combined core barrel according to claim 3, characterized in that both the intermediate core barrel sub-section (2) and the end core barrel sub-section (3) include a connector assembly, an upper connecting cylinder (202) and a core barrel sub-section main body (203). A first multi-core socket (210) is fixed to the inner side wall of the upper end of the connector assembly. The upper connecting cylinder (202) is detachably connected to the outer side wall of the lower end of the connector assembly. The core barrel sub-section main body (203) is in a columnar structure and a first installation groove with an upward opening is formed at the top thereof. The inner side wall of the first installation groove is detachably connected to the lower end of the upper connecting cylinder (202); a second installation groove with a downward opening is formed at the bottom end of the core barrel sub-section main body (203); a plurality of ballistic holes arranged radially along the core barrel sub-section main body (203) are axially spaced apart in the middle of the outer side wall of the core barrel sub-section main body (203). The core-taking mechanisms (7) are slidably installed in the plurality of ballistic holes one by one and are connected to the outer side wall in the middle of the core barrel sub-section main body (203) through steel wires (9); Wherein, the intermediate core sampling gun short section (2) further includes a lower connecting cylinder (204). One end of the lower connecting cylinder (204) is connected to the inner side wall of the corresponding second installation groove, and a second multi-core plug (209) is fixed on the inner side wall of the other end. One end of the connector assembly of the intermediate core sampling gun short section (2) close to the first multi-core socket (210) is detachably connected to the inner side wall of one end of the control short section outer cylinder (101) close to the first multi-core plug (109), and the first multi-core plug (109) can be electrically plugged into the first multi-core socket (210). One end of the connector assembly of the end core sampling gun short section (3) close to its first multi-core socket (210) is detachably connected to the inner side wall of the lower connecting cylinder (204), and its first multi-core socket (210) can be electrically plugged into the second multi-core plug (209). The inner side wall of the second installation groove of the end core sampling gun short section (3) is connected to the top end of the end cap (4).

5. A combined core sampling gun according to claim 4, characterized in that, the connector assembly structure includes a double-headed connecting cylinder (201), a first screw sleeve assembly and a second screw sleeve assembly. A first multi-core socket (210) is fixed on the inner side wall of the top end of the double-headed connecting cylinder (201). A fixing protrusion (2011) is formed in the middle of the outer wall of the double-headed connecting cylinder (201). The first screw sleeve assembly is sleeved on the outer side wall of the upper end of the double-headed connecting cylinder (201), and its bottom end abuts against the fixing protrusion (2011). The second screw sleeve assembly is symmetrically arranged with respect to the median line L of the fixing protrusion (2011) and is sleeved on the outer side wall of the lower end of the double-headed connecting cylinder (201). Its upper end abuts against the lower end face of the fixing protrusion (2011), and the second screw sleeve assembly is detachably connected to the inner side wall of the top end of the upper connecting cylinder (202); wherein, the top end of the double-headed connecting cylinder (201) of the intermediate core sampling gun short section (2) is detachably connected to the inner side wall of one end of the control short section outer cylinder (101) close to the first multi-core plug (109), and the double-headed connecting cylinder (201) of the end core sampling gun short section (3) is detachably connected to the inner side wall of the lower connecting cylinder (204) of the intermediate core sampling gun short section (2).

6. A combined core sampling gun according to claim 5, characterized in that, the first screw sleeve assembly and the second screw sleeve assembly have the same structure and both include an external thread sleeve (205) and a screw sleeve fixing component. The external thread sleeve (205) is sleeved on the outer side wall of the double-headed connecting cylinder (201). A screw sleeve protrusion is formed on the outer side wall of one end of the external thread sleeve (205), and an external thread is provided on the outer side wall of the other end. The screw sleeve protrusion abuts against the fixing protrusion (2011). An annular placement groove is formed on the outer side wall of the double-headed connecting cylinder (201) close to the external thread end of the external thread sleeve (205). The screw sleeve fixing component is sleeved in the annular placement groove and abuts against the end of the external thread sleeve (205) close to the external thread to lock and fix the external thread sleeve (205).

7. A combined core barrel gun according to claim 6, characterized in that, the sleeve fixing assembly includes a fixing ring (206), a disassembling ring (207) and a circlip (208). The fixing ring (206) is connected to one end of the inner side wall of the annular placement groove close to the external thread sleeve (205). A clamping projection (2061) is formed on the outer side wall of the end of the fixing ring (206) away from the external thread sleeve (205). The clamping projection (2061) abuts against one end of the external thread sleeve (205) close to its external thread. The disassembling ring (207) is connected to one end of the inner side wall of the annular placement groove away from the external thread sleeve (205), and one end thereof abuts against the end of the fixing ring (206) away from the external thread sleeve (205), and the other end abuts against the other end of the annular placement groove away from the external thread sleeve (205). The circlip (208) is sleeved on the outer side wall of the disassembling ring (207).

8. A combined core barrel gun according to claim 5, characterized in that, a pressure-bearing assembly is fixed inside the upper connecting cylinder (202). The pressure-bearing assembly includes a pressure-bearing disc (211) and a terminal block assembly (212). The pressure-bearing disc (211) is of a columnar structure, and a through hole is axially formed in the middle thereof. The terminal block assembly (212) is connected in the through hole. The input end of the terminal block assembly (212) is connected to the first multi-core socket (210) through a wire (13), and the output end is connected to the core-taking mechanism (7) through a wire (13). Among them, the output end of the terminal block assembly (212) inside the intermediate core barrel short section (2) is also connected to the second multi-core plug (209) through a wire (13).

9. A combined core barrel gun according to claim 8, characterized in that, a pressure-bearing disc positioning block (2111) is fixed at the top of the pressure-bearing disc (211). A positioning groove is formed on the outer side wall of one end of the double-headed connecting cylinder (201) away from the first multi-core socket (210). The pressure-bearing disc positioning block (2111) is inserted into the positioning groove and fixed by a second positioning screw (213).

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