A cable fishing wet joint, a cable-assisted intelligent separate injection system and a construction method thereof

Abstract

The present application relates to a cable fishing wet joint, a cable intelligent separate injection system and a construction method thereof. The conventional cable intelligent separate injection technology has high transmission communication timeliness, but needs to fix the cable outside the oil pipe, and cannot realize the operation under pressure. The wave code type intelligent separate injection technology can realize the operation under pressure, but has poor transmission control timeliness, and cannot obtain the downhole instrument state in real time. The cable intelligent separate injection system provided by the present application is connected with the intelligent separate injection instrument below the tool section, and is connected with the cable fishing wet joint above the tool section. The female head of the wet joint is connected to the uppermost end of the tool section, is responsible for the butt joint with the male head of the wet joint, and realizes the electrical connection and the sealing insulation between the cable and the downhole cable type intelligent separate injection instrument. After the male head of the wet joint is pulled out, the central passage of the female head of the wet joint can be used as a testing instrument passage. Since there is no exposed cable, the cable is not damaged when the underground casing is lowered, so that the operation under pressure can be realized, and the downhole data can be monitored in real time, and the construction efficiency is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of intelligent layering water injection in oilfields, and relates to a cable fishing wet joint applicable to a pressure operation separate injection system, in particular to a cable fishing wet joint, a cable intelligent separate injection system and a construction method thereof. BACKGROUND

[0002] Fine intelligent layering water injection technology plays a great role in improving oilfield recovery, and with the continuous progress of technology, the process method of layering water injection in oilfields is constantly updated. At present, the intelligent separate injection process technology of long-term placement in the downhole is gradually promoted, and according to the communication mode, it is mainly divided into traditional cable intelligent separate injection technology and wave code intelligent separate injection technology.

[0003] However, in the actual application process, both of the two separate injection technologies have certain advantages and limitations. The traditional cable intelligent separate injection technology has high timeliness of data transmission and control, but the tool section of the pipe string structure and the tubing section need to use a large number of cable guards to fix the cable outside the tubing, which is time-consuming and laborious, the cable sealing points are many, and the pressure operation cannot be realized. The wave code intelligent separate injection technology does not need to bind the cable outside the pipe string structure and the tubing section, and can realize the pressure operation, but it takes tens of minutes to communicate a command or data, the timeliness is poor, the efficiency is low, and the downhole instrument state cannot be obtained in real time, and the construction well selection has certain requirements for well conditions. SUMMARY

[0004] In order to solve the above problems, the application provides a cable fishing wet joint, a system and a method suitable for cable intelligent separate injection, which realizes the pressure operation and real-time monitoring of the downhole instrument state by embedding the cable inside the tubing through the cable fishing wet joint, has good timeliness and high efficiency.

[0005] In order to achieve the above purpose, the technical scheme adopted by the application is as follows:

[0006] A cable fishing wet joint female head, comprising a sleeve, end covers are arranged at the upper and lower ends of the sleeve, a ring sleeve is arranged in the sleeve, the ring sleeve is connected with the end cover at the lower end of the sleeve, an annular flow passage is formed between the ring sleeve and the sleeve, a female head conductive ring is arranged on the inner circumference of the ring sleeve, female head insulating sleeves are arranged on the upper and lower ends of the female head conductive ring and are sleeved on the inner circumference of the ring sleeve, a female head sealing ring is further arranged on the inner circumference of the ring sleeve at the opposite two outer ends of the pair of female head insulating sleeves, a plurality of first liquid holes penetrating the annular flow passage are radially distributed on the inner circumference of the end cover at the upper end of the sleeve, and a plurality of second liquid holes penetrating the annular flow passage are radially distributed on the inner circumference of the end cover at the lower end of the sleeve.

[0007] Further, a female cable is provided, one end of the female cable is connected to the female conductive ring, and the other end of the female cable extends downward along the sleeve to the end cap of the lower end of the column sleeve.

[0008] A cable fishing wet joint is provided, the wet joint female is provided as described above, a wet joint male is inserted into the wet joint female, the wet joint male includes a cable head column, a male conductive ring is sleeved on the outer periphery of the cable head column and is in contact and conduction with the female conductive ring, upper and lower end portions of the male conductive ring are provided with male insulating sleeves sleeved on the outer periphery of the cable head column, and opposite two outer end portions of the pair of male insulating sleeves are provided with male sealing rings sleeved on the outer periphery of the cable head column, the lower end of the cable head column has an insulating oil containing cavity, and the insulating oil containing cavity is sequentially provided with an insulating oil one-way valve, a spring and a differential pressure sliding shaft from top to bottom inside the insulating oil containing cavity, a plurality of third liquid holes penetrating the outer periphery of the cable head column are radially provided on the insulating oil containing cavity at the upper end of the insulating oil one-way valve, a plurality of fourth liquid holes penetrating the outer periphery of the cable head column are radially provided on the insulating oil containing cavity at the lower end of the differential pressure sliding shaft, and the insulating oil for filling enters from the fourth liquid holes to make the differential pressure sliding shaft move upward to trigger the spring to open the insulating oil one-way valve and then flow out from the third liquid holes.

[0009] Further, the wet joint male further includes a male cable, the male cable is inserted into the cable head column, one end of the male cable extends upward out of the upper end portion of the cable head column, and the other end of the male cable extends downward along the cable head column and is in contact with the male conductive ring.

[0010] Further, when the wet joint male is inserted into the wet joint female, the male conductive ring and the female conductive ring are in mutual sealing, insulation and conduction, and when the wet joint male is separated from the wet joint female, the central passage of the wet joint female forms a passage for lowering a logging instrument.

[0011] Further, the wet joint male further includes a counterweight, and the counterweight is connected to the lower end of the insulating oil containing cavity.

[0012] Further, a locking structure is provided on the wet joint male, the locking structure includes a locking block provided on the outer periphery of the cable head column of the wet joint male and a locking pin, the wet joint male and the wet joint female are locked and connected when the locking block is limited by the locking pin, and the wet joint male and the wet joint female are separated when the locking pin is disconnected.

[0013] A cable type intelligent separate injection system comprises the cable fishing wet joint, the ground controller and the tool section, the tool section is sleeved with a downhole casing, the cable fishing wet joint is sleeved on the upper end of the tool section in the downhole casing, and the tool section is connected with the ground controller through the cable fishing wet joint.

[0014] Further, the male end of the cable fishing wet joint is sleeved in the tubing of the downhole casing, the upper end of the male end is connected with the ground controller through the ground cable, the female end of the cable fishing wet joint is connected with the tool section, the tool section comprises an intelligent separate injection instrument, the intelligent separate injection instrument is connected with the female end of the cable fishing wet joint through the tubing, a steel pipe cable is arranged in the tubing, the upper end of the steel pipe cable is connected with the female end of the cable fishing wet joint, and the lower end of the steel pipe cable is connected with the intelligent separate injection instrument; and the lower end of the ground cable is connected with the male end of the cable fishing wet joint.

[0015] A construction method of the cable type intelligent separate injection system comprises the following steps.

[0016] Step S1, the tool section is sequentially lowered from the wellhead of the separate injection well, the steel pipe cable of the tool section passes through the inside of the tubing, and the steel pipe cable is connected from the lowermost intelligent separate injection instrument to the lower end of the female end of the wet joint at the uppermost end of the tool section.

[0017] Step S2, the upper end of the tool section is connected with the female end of the wet joint, the female end of the wet joint is connected with the tubing to the wellhead, and the pipe string construction is completed.

[0018] Step S3, the wellhead construction and the ground controller installation construction are performed.

[0019] Step S4, the ground controller is connected with the male end of the wet joint through the ground cable, so that the male end of the wet joint is lowered into the well and is connected with the female end of the wet joint.

[0020] Step S5, after the tool section is pulled out through the male end of the wet joint, the conventional testing instrument is lowered through the central passage of the female end of the wet joint to perform well logging.

[0021] The intelligent separate injection system has the following advantages and effects due to the above technical scheme.

[0022] 1. The intelligent separate injection system comprises the cable type electric sealing integrated intelligent separate injection instrument connected in the tool section, the cable fishing wet joint connected above the tool section, and the tubing section from the tool section to the wellhead of the male end of the wet joint, and the male end of the wet joint is connected with the female end of the wet joint through the inside of the tubing, the male end of the wet joint is lowered and connected with the female end of the wet joint through the cable fishing wet joint, the cable is not needed to be bound and protected, the cable is not damaged when the downhole casing is lowered, the construction efficiency is high, the cable type construction can support the pressure operation, the well fluid is not overflowed to the ground, the water injected into the stratum in the early stage is not vomited, the wellhead operation is friendly to the environment, and the environment is protected.

[0023] 2、The wet joint female head of the cable fishing wet joint is connected at the uppermost end of the tool section, and after the wet joint female head is butted against the wet joint male head, the wet joint female head can realize electrical connection and sealing insulation between the cable and the downhole cable type electric sealing integrated intelligent injection instrument together with the wet joint male head, the annular flow passage in the wet joint female head is used for passing liquid, and after the wet joint male head is pulled up and separated from the wet joint female head, the central passage for inserting the wet joint male head in the center of the wet joint female head can also be used as a passage of the testing instrument, so that the lower layer flow, temperature, pressure and nozzle opening degree can be monitored in real time, data is read in real time, and the testing and adjusting efficiency is high.

[0024] 3、The cable fishing wet joint of the present application has the function of secondary oil injection in single butt joint, improves the reliability of insulation performance, and only needs to discharge residual water stains in the conductive cavity of the cable fishing wet joint through the automatic oil injection mechanism to fill insulation oil, realizes the insulation effect of the mechanism, and the male head and the female head of the cable fishing wet joint can be butt jointed unlimited times, the insulation oil is supplemented before each butt joint, the insulation performance is consistent, and the repeated consistency of multiple butt jointing is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the male head structure of the cable fishing wet joint of the present application.

[0026] Figure 2 It is a schematic diagram of the female head structure of the cable fishing wet joint of the present application.

[0027] Figure 3 It is a schematic diagram of the plug-in cooperation structure of the male head and the female head of the cable fishing wet joint of the present application.

[0028] Figure 4 It is a schematic diagram of the cable intelligent injection system of the present application.

[0029] Among them, 1 is a ground controller, 2 is a downhole casing, 3 is a tubing, 4 is a cable fishing wet joint, and 5 is a tool section.

[0030] 41 is a wet joint male head, 411 is a cable head column, 412 is a locking pin, 413 is a locking block, 414 is an upper sealing ring of the male head, 415 is an upper insulation sleeve of the male head, 416 is a male head conductive ring, 417 is a lower insulation sleeve of the male head, 418 is a lower sealing ring of the male head, 419 is an insulation oil one-way valve, 4110 is a spring, 4111 is an insulation oil containing cavity, 4112 is a differential pressure sliding shaft, 4113 is a counterweight, and 4114 is a male head cable.

[0031] 42-wet connector female, 421-upper end cap, 422-column sleeve, 423-ring sleeve, 424-annular flow channel, 425-sealing ring on female, 426-insulating sleeve on female, 427-conductive ring on female, 428-insulating sleeve below female, 429-sealing ring below female, 4210-female cable, 4211-lower end cap;

[0032] 51-Steel pipe cable, 52-Intelligent dispenser, 53-Double-acting valve, 54-Screen tube, 55-Thread plug. DETAILED DESCRIPTION

[0033] The following will be described in detail with reference to the accompanying drawings to provide a clearer understanding of the objectives, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0034] The present invention relates to a cable casting wet joint and a cable intelligent dispensing system and construction method. A cable casting wet joint includes a cable casting wet joint female head and a cable casting wet joint male head. The cable casting wet joint male head is plugged into the cable casting wet joint female head to form a sealed connection and can be connected to a downhole tool section. After the cable casting wet joint male head is pulled out, the cable casting wet joint female head can be used alone. The cable intelligent dispensing system of the present invention is suitable for pressure operation, including a ground controller, a cable casting wet joint and a tool section. The tool section includes a cable-type electric testing and sealing integrated intelligent dispensing instrument. The cable casting wet joint female head is connected to the top of the tool section. The wet joint female head and the wet joint male head are docked and together realize the electrical connection and sealed insulation between the cable and the downhole cable intelligent dispensing instrument. After the wet joint male head is pulled out, the central channel of the wet joint female head can be used as a test instrument channel. Since there is no exposed cable, the cable is avoided from being damaged when the underground casing is lowered. Therefore, pressure operation can be realized and downhole data can be monitored in real time.

[0035] like Figure 1 、 Figure 2 、 Figure 3The application provides a cable fishing wet joint. The cable fishing wet joint comprises a female wet joint 42 and a male wet joint 41. The male wet joint 41 is inserted into the female wet joint 42 to realize sealing, and the central inner cavity of the female wet joint 42 is used as a passage of a lower pipe column after the male wet joint 41 is pulled out. The female wet joint 42 comprises a column sleeve 422 and a female cable 4210. The upper end and the lower end of the column sleeve 422 are provided with end covers. The column sleeve 422 is sleeved with a ring sleeve 423. The ring sleeve 423 is connected with the end cover at the lower end of the column sleeve 422. An annular flow passage 424 is formed between the ring sleeve 423 and the column sleeve 422. A female conductive ring 427 is sleeved on the inner circumferential surface of the ring sleeve 423. The upper end and the lower end of the female conductive ring 427 are provided with female insulating sleeves which are sleeved on the inner circumferential surface of the ring sleeve 423. The opposite outer end portions of the female insulating sleeves are further provided with female sealing rings which are sleeved on the inner circumferential surface of the ring sleeve 423. A plurality of first liquid holes which are penetrated through the annular flow passage 424 are radially distributed on the inner circumferential surface of the end cover at the upper end of the column sleeve 422. A plurality of second liquid holes which are penetrated through the annular flow passage 424 are radially distributed on the inner circumferential surface of the end cover at the lower end of the column sleeve 422. One end of the female cable 4210 is connected with the female conductive ring 427, and the other end of the female cable 4210 extends downward along the ring sleeve 423 to the end cover at the lower end of the column sleeve 422.

[0036] Specifically, the female wet joint 42 is a circular pipe body structure, and a central passage is formed through the upper end and the lower end of the female wet joint 42. The lower end of the female wet joint 42 is connectable with a tool section tubing. The column sleeve 422 is an annular cylinder, and the upper end and the lower end of the column sleeve 422 are provided with annular grooves. The end cover comprises an upper end cover 421 and a lower end cover 4211. The end portions of the upper end cover 421 and the lower end cover 4211 are provided with stepped surfaces which are matched with the annular grooves at the upper end and the lower end of the column sleeve 422. The column sleeve 422, the upper end cover 421 and the lower end cover 4211 are sealingly connected with a nut or are in interference fit. The inner cavity of the upper end cover 421 is a tapered cavity which facilitates liquid inflow and insertion of the male wet joint 41. A plurality of first liquid holes which are penetrated through the annular flow passage 424 are radially distributed on the inner cavity wall of the upper end cover 421 and are axially penetrated through the inner cavity of the upper end cover 421 and the upper end of the annular flow passage 424. The inner cavity of the lower end cover 4211 is a tapered cavity which facilitates liquid outflow. A plurality of second liquid holes which are penetrated through the annular flow passage 424 are radially distributed on the inner cavity wall of the lower end cover 4211 and are axially penetrated through the inner cavity of the lower end cover 4211 and the lower end of the annular flow passage 424. The first liquid holes, the second liquid holes and the annular flow passage 424 are connected to form a water injection passage. When the male wet joint 41 is inserted into the central passage of the female wet joint 42, the water injection passage can be used as a water injection passage which replaces the central passage.

[0037] The ring sleeve 423 is also a ring-shaped cylinder, and an accommodating female cable 4210 first cable passage is axially arranged on the inner wall of the lower end of the ring sleeve 423. The upper end of the first cable passage penetrates the sleeve wall and communicates with the female conductive ring 427. The upper end of the female cable 4210 extends along the first cable passage to the female conductive ring 427 and is connected thereto. An axial second cable passage is arranged on the inner wall of the lower end cover 4211 and penetrates the first cable passage on the ring sleeve 423. The second cable passage penetrates the upper and lower end faces of the lower end cover 4211. The lower end of the female cable 4210 extends along the second cable passage to the end of the lower end cover 4211. The female sealing ring includes a female upper sealing ring 425 and a female lower sealing ring 429. The female insulating sleeve includes a female upper insulating sleeve 426 and a female lower insulating sleeve 428. The female upper insulating sleeve 426 and the female lower insulating sleeve 428 are arranged at the two ends of the female conductive ring 427 to insulate the female conductive ring 427. The female upper sealing ring 425 and the female lower sealing ring 429 are arranged at the two ends of the female upper insulating sleeve 426 and the female lower insulating sleeve 428, respectively, to seal the female conductive ring 427.

[0038] Further, the wet connector male head 41 includes a cable head column 411 and a male cable 4114. The outer peripheral surface of the cable head column 411 is sleeved with a male conductive ring 416 that is in contact with the female conductive ring 427. The upper and lower ends of the male conductive ring 416 are provided with male insulating sleeves that are sleeved on the outer peripheral surface of the cable head column 411. The opposite two outer end portions of the pair of male insulating sleeves are also provided with male sealing rings that are sleeved on the outer peripheral surface of the cable head column 411. The lower end of the cable head column 411 has an insulating oil accommodating cavity 4111. The inside of the insulating oil accommodating cavity 4111 is sequentially provided from top to bottom with an insulating oil one-way valve 419, a spring 4110, and a differential pressure sliding shaft 4112. The radial direction of the insulating oil accommodating cavity 4111 at the upper end of the insulating oil one-way valve 419 is provided with a plurality of third liquid holes that penetrate the outer peripheral surface of the cable head column 411. The radial direction of the insulating oil accommodating cavity 4111 at the lower end of the differential pressure sliding shaft 4112 is provided with a plurality of fourth liquid holes that penetrate the outer peripheral surface of the cable head column 411. The insulating oil used for filling enters the lower part of the insulating oil accommodating cavity 4111 from the fourth liquid hole, pushes the differential pressure sliding shaft 4112 to move upward, touches the spring 4110, extrudes and opens the insulating oil one-way valve 419, and then flows out from the third liquid hole. The male cable 4114 is inserted into the cable head column 411. One end of the male cable 4114 extends upward out of the upper end of the cable head column 411. The other end of the male cable 4114 extends downward along the cable head column 411 and is connected to the male conductive ring 416.

[0039] Specifically, the cable head column 411 is a cylindrical structure, and a third cable passage is formed in the inner center of the upper end of the cable head column 411, the third cable passage extends axially along the cable head column 411 to the inner ring surface of the male head conductive ring 416, and the lower end of the third cable passage penetrates radially through the cable head column 411 and is opposite to the male head conductive ring 416, and the male head cable 4114 is connected to the male head conductive ring 416 through the third cable passage. The male head sealing ring includes a male head upper sealing ring 414 and a male head lower sealing ring 418, and the male head insulating sleeve includes a male head upper insulating sleeve 415 and a male head lower insulating sleeve 417, and the male head upper insulating sleeve 415 and the male head lower insulating sleeve 417 are arranged at both ends of the male head conductive ring 416 to realize insulation of the male head conductive ring 416, and the male head upper sealing ring 414 and the male head lower sealing ring 418 are arranged at both ends of the male head upper insulating sleeve 415 and the male head lower insulating sleeve 417 to realize sealing of the male head conductive ring 416. When the wet connector male head 41 and the wet connector female head 42 are inserted and matched with each other, the male head conductive ring 416 and the female head conductive ring 427 realize sealed insulation conduction. The third liquid hole and the fourth liquid hole form annular conduction of the insulating oil, so that the insulating oil one-way valve 419 realizes opening and closing.

[0040] Further, when the wet connector male head 41 is inserted into the wet connector female head 42, the male head conductive ring 416 and the female head conductive ring 427 realize mutual sealed insulation conduction; when the wet connector male head 41 is separated from the wet connector female head 42, the central passage of the wet connector female head 42 forms a passage for lowering the logging instrument. When the wet connector male head 41 and the wet connector female head 42 are inserted and matched with each other, the male head conductive ring 416 and the female head conductive ring 427 realize mutual conduction, at this time, a pair of male head insulating sleeves and a pair of female head insulating sleeves are matched with each other to insulate both ends of the male head conductive ring 416 and the female head conductive ring 427, and a pair of male head sealing rings and a pair of external sealing rings are matched with each other to seal both ends of the pair of female head insulating sleeves and the pair of male head insulating sleeves.

[0041] Specifically, when the wet connector male head 41 is inserted into the wet connector female head 42, the wet connector male head 41 is responsible for interfacing with the wet connector female head 42, and after the wet connector male head 41 interfaces with the wet connector female head 42, the wet connector male head 41 and the wet connector female head 42 realize electrical connection and sealed insulation between the cable and the downhole cable type electric sealing integrated intelligent injection instrument 52. After the wet connector male head 41 and the wet connector female head 42 are interfaced and sealed, a cavity conductive cavity is formed between the upper and lower sealing surfaces, and at the same time, the exchange of internal and external liquids between the insulating oil in the conductive cavity and the injected water in the oil pipe can be prevented.

[0042] When the wet joint male head 41 and the wet joint female head 42 are inserted and matched to each other, the wet joint male head 41 is sealed on the upper and lower sealing surfaces under the action of its own gravity and impact force, and the locking mechanism realizes the locking function to prevent the instrument from moving upward, and the insulation oil one-way valve 419 is unlocked by the side wall of the wet joint female head 42, so that the inner cavity of the wet joint female head 42 and the insulation oil containing cavity 4111 are communicated. Since the pressure on the lower surface of the differential pressure sliding sleeve 4112 is greater than that on the upper surface, the differential pressure sliding sleeve 4112 moves upward to inject the insulation oil in the insulation oil containing cavity 4111 into the conductive cavity after the butt joint, and at the same time, the residual water in the conductive cavity is discharged, so that the conductive cavity is filled with insulation oil, and the insulation effect of the male head conductive ring 416 and the female head conductive ring 427 with the external environment is realized. The residual water in the conductive cavity is discharged, and the insulation oil is filled by the automatic oil injection mechanism.

[0043] The wet joint female head 42 has a central passage and an annular overflow passage 424, the central passage is used for butt joint with the wet joint male head 41, and the annular overflow passage 424 is used for liquid overflow. When the wet joint male head 41 needs to be pulled out, the cable is pulled to drive the cable head column 411 to move upward, at this time the locking mechanism is disabled, and the wet joint male head 41 and the wet joint female head 42 are separated. After the wet joint male head 41 is pulled up, the central passage of the wet joint female head 42 can be used as a test instrument passage. When the wet joint male head 41 is butt jointed with the wet joint female head 42 again, only insulation oil needs to be supplemented, and damaged parts need to be replaced.

[0044] Further, the wet joint male head 41 further comprises a counterweight 4113 connected to the lower end of the insulation oil containing cavity 4111. The counterweight 4113 is threadedly and sealingly connected to the lower end of the insulation oil containing cavity 4111 at the lower end of the wet joint male head 41, and the holding of the counterweight 4113 increases the gravity of the wet joint male head 41, so that the wet joint male head 41 can be butt jointed with the wet joint female head 42 by relying on its own gravity.

[0045] Further, the wet joint male head 41 is provided with a locking structure, the locking structure comprises a locking block 413 arranged on the outer periphery of the cable head column 411 of the wet joint male head and a locking pin 412, the wet joint male head 41 and the wet joint female head 42 are locked and connected at the upper end when the locking block 413 is limited by the locking pin 412, and the wet joint male head 41 and the wet joint female head 42 are separated when the locking pin 412 is disconnected. The cable head column 411 is connected with the ground cable, and at the same time can provide suspension force and conductive and communication functions.

[0046] Specifically, the outer circumferential surface of the cable head column 411 at the upper end of the male sealing ring is provided with a locking structure for locking the inner circumferential surface of the upper end of the female wet joint 42. When the locking block 413 of the locking structure is limited by the locking pin 412, the upper end of the cable head column 411 and the female wet joint 42 are locked. When the locking pin 412 is disconnected, the cable head column 411 is separated from the central passage of the female wet joint 42.

[0047] The locking block 413 is radially distributed along the outer circumferential surface of the cable head column 411. A locking groove is formed on the outer circumferential surface of the cable head column 411. One end of the locking block 413 is hinged in the locking groove, and the other end of the locking block 413 extends out of the outer circumferential surface of the cable head column 411. The end of the locking block 413 extending out of the cable head column 411 can rotate up and down in the axial direction to extend into or out of the locking groove. The upper surface of the locking block 413 in the locking groove is provided with a torsion spring, which is embedded between the locking groove and the locking block 413 to provide elastic force for the downward rebound of the locking block.

[0048] The locking structure mainly provides locking force after the wet joint male head 41 and the female wet joint 42 are connected to prevent the wet joint male head 41 from separating from the female wet joint 42. When the wet joint male head 41 is lowered, the locking block 413 compresses the torsion spring, the locking block 413 rotates upward to retract, the wet joint male head 41 can pass through the necked section, and then the locking block 413 rebounds and locks under the action of the torsion spring. Since the locking pin 412 is radially distributed on the outer circumferential surface of the cable head column 411 at the upper end of the locking block 413 and corresponds to the axial up and down of the locking block 413, the locking pin 412 cannot rotate downward to retract, and cannot pass through the necked section of the upper end cover 421 of the female wet joint 42 upward, so the locking block 413 cannot move upward to achieve clamping.

[0049] When the locking structure is unlocked, the cable head column 411 of the wet joint male head 41 is pulled upward. When the pulling force exceeds the ultimate shear stress of the locking pin 412, the cable head column 411 shears the locking pin 412, the cable head column 411 moves a small distance upward relative to the locking pin 412, the cable head column 411 and the locking pin 412 are separated, the locking of the locking pin 412 to the locking block 413 is released, at this time, the locking block 413 rotates downward to retract under the action of the torsion spring, the wet joint male head 41 can pass through the necked section of the upper end cover 421 of the female wet joint 42 and can be smoothly pulled out. In order to facilitate shearing, the locking pin 412 is preferably a copper pin.

[0050] As Figure 4The application provides a cable type intelligent separate injection system, which comprises a cable fishing wet joint 4, a ground controller 1 and a tool section 5. The tool section 5 is sleeved with a downhole casing 2. The cable fishing wet joint 4 is sleeved on the upper end of the tool section 5 in the downhole casing 2. The tool section 5 is connected with the ground controller 1 through the cable fishing wet joint 4.

[0051] Further, the wet joint male head 41 of the cable fishing wet joint 4 is sleeved with a tubing 3 of the downhole casing 2. The upper end of the wet joint male head 41 is connected with the ground controller 1 through a ground cable. The wet joint female head 42 is connected with the tool section 5. The tool section 5 comprises an intelligent separate injection instrument 52. The intelligent separate injection instrument 52 is connected with the wet joint female head 42 through the tubing 3. The tubing 3 and the intelligent separate injection instrument 52 are connected through threads. A steel pipe cable 51 is arranged in the tubing 3. The upper end of the steel pipe cable 51 is connected with the lower end of the cable fishing wet joint 41 and the female head cable 4210. The lower end of the steel pipe cable 51 is connected with the intelligent separate injection instrument 52. The lower end of the ground cable is connected with the end of the male head cable 4114 of the upper end of the wet joint male head 41.

[0052] Specifically, the tubing 3 is coaxially sleeved in the downhole casing 2 to realize the connection of the tool section. The tool section 5 comprises a cable type electric sealing integrated intelligent separate injection instrument 52, a double-acting valve 53, a screen pipe 54 and a plug 55. The double-acting valve 53, the screen pipe 54 and the plug 55 are sequentially connected through threads. The double-acting valve 53 is arranged at the lower end of the separate injection well completion string. When the tubing 3 is lowered, the double-acting valve 53 plays a sealing blowout prevention role. After the tubing 3 is lowered to the position, the double-acting valve 53 is converted from the sealing blowout prevention role into a one-way valve, so that the separate injection and reverse well flushing functions are realized. The steel pipe cable 51 and the intelligent separate injection instrument 52 are connected through a cable joint. One end of the cable joint is connected with the steel pipe cable 51. The other end of the cable joint is connected with the intelligent separate injection instrument 52 through a plug-in sealing. The intelligent separate injection instrument 52 is preferably a cable type electric sealing integrated intelligent separate injection instrument. The cable type electric sealing integrated intelligent separate injection instrument is a prior art, which integrates the functions of an electric packer and a cable type intelligent separate injection instrument. The electric packer part realizes electric setting and electric unsetting. The cable type intelligent separate injection instrument part realizes real-time monitoring of downhole separate layer flow, temperature, pressure and water nozzle opening degree and real-time control of injection amount by adjusting the water nozzle.

[0053] The ground controller 1 is mainly used for sending the test command and receiving and processing the test data returned by the intelligent injection instrument 52 at the tool end. The ground cable is connected to the ground controller 1 at the upper end and connected to the male cable 4114 of the male wet joint 41 at the lower end, which is mainly used for power supply and transmission of the carrier signal of the intelligent injection instrument 52. The ground cable and the male cable 4114 can be connected to form a cable, or can be formed by a cable, and the ground cable can also provide the hanging force and realize the conduction and communication function with the tool section.

[0054] As shown again in Figure 4 The present application provides a construction method of the cable intelligent injection system, which comprises the following steps:

[0055] Step S1, during the construction, the tool section 5 is lowered into the injection well from the wellhead according to the tool structure sequence of the pipe string, the tools at the lowermost end are sequentially connected from the lower to the upper as the plug 55, the screen pipe 54, the double-acting valve 53 and the intelligent injection instrument 52, the number of the injection pipe string is determined according to the number of the injection layer, in the embodiment, three injection pipe strings are lowered for three injection layers, and the intelligent injection instrument 52 is arranged in each injection pipe string.

[0056] The steel pipe cable 51 of the tool section 5 is sequentially passed through the inside of the oil pipe 3, and the steel pipe cable 51 is connected to each tool of the lower tool section by using the cable joint; the steel pipe cable 51 is connected from the lowermost intelligent injection instrument 52 of the tool section 5 to the lower end of the wet joint female head 42 at the uppermost end of the tool section 5.

[0057] Step S2, the upper end of the tool section 5 is connected to the wet joint female head 42, the upper end of the wet joint female head 42 is connected to the oil pipe 3 through the thread and extends to the wellhead, and the whole pipe string construction only needs to lower the tool section once.

[0058] Step S3, after the completion of the pipe string construction, the ground construction is carried out, which includes the wellhead construction and the installation construction of the ground controller.

[0059] Step S4, after the completion of the ground construction, the ground controller 1 is hung to the wet joint male head 41 through the ground cable, the ground cable is hung to the wet joint male head 41 and is connected to the wet joint female head 42 after being lowered into the well, and the whole system construction is completed.

[0060] Step S5, during the normal injection, the water is injected from the ground into the oil pipe 3, flows through the central passage of the wet joint male head 41 and the wet joint female head 42, and finally is injected into the stratum through the water nozzle of the intelligent injection instrument 52; when the wet joint male head 41 is lifted out of the tool section 5, the central passage of the wet joint female head 42 is emptied, and at this time, the traditional testing instrument can be lowered to carry out the well construction operation.

[0061] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cable casting and fishing wet joint, characterized by: The invention comprises a wet joint female head (42), wherein a wet joint male head (41) is inserted into the wet joint female head (42), wherein the wet joint female head (42) comprises a column sleeve (422), wherein the upper and lower ends of the column sleeve (422) are both provided with end caps, wherein a ring sleeve (423) is provided inside the column sleeve (422), wherein the ring sleeve (423) is connected to the end cap at the lower end of the column sleeve (422), wherein an annular flow passage (424) is formed between the ring sleeve (423) and the column sleeve (422), wherein a female conductive ring (424) is provided on the inner circumference of the ring sleeve (423) 7), the upper and lower ends of the female conductive ring (427) are both provided with a female insulating sleeve sleeved on the inner circumference of the ring sleeve (423), and the two opposite outer ends of a pair of the female insulating sleeves are also provided with a female sealing ring sleeved on the inner circumference of the ring sleeve (423); the inner circumference of the end cover at the upper end of the column sleeve (422) is radially distributed with a plurality of first liquid holes that are connected to the annular flow channel (424), and the inner circumference of the end cover at the lower end of the column sleeve (422) is radially distributed with a plurality of second liquid holes that are connected to the annular flow channel (424); The wet connector male connector (41) includes a cable head column (411), the outer circumference of the cable head column (411) is provided with a male conductive ring (416) that is in contact with and conductive to the female conductive ring (427), the upper and lower ends of the male conductive ring (416) are both provided with male insulating sleeves that are sleeved on the outer circumference of the cable head column (411), a pair of male insulating sleeves are provided with male sealing rings that are sleeved on the outer circumference of the cable head column (411), the lower end of the cable head column (411) has an insulating oil accommodating chamber (4111), and the interior of the insulating oil accommodating chamber (4111) is provided with insulating oil seals in sequence from top to bottom. An oil one-way valve (419), a spring (4110) and a differential pressure slide shaft (4112); a plurality of third liquid holes penetrating the outer peripheral surface of the cable head column (411) are radially provided in the insulating oil accommodating chamber (4111) at the upper end of the insulating oil one-way valve (419); a plurality of fourth liquid holes penetrating the outer peripheral surface of the cable head column (411) are radially provided in the insulating oil accommodating chamber (4111) at the lower end of the differential pressure slide shaft (4112); insulating oil for filling enters the insulating oil accommodating chamber (4111) through the fourth liquid holes, pushes the differential pressure slide shaft (4112) upward, touches the spring (4110), opens the insulating oil one-way valve (419), and then flows out from the third liquid holes.

2. A cable casting and fishing wet joint according to claim 1, characterized in that: The wet connector female connector (42) further includes a female connector cable (4210), one end of the female connector cable (4210) being connected to the female connector conductive ring (427), and the other end of the female connector cable (4210) extending downwardly along the ring sleeve (423) to the end cap end at the lower end of the column sleeve (422).

3. A cable casting and fishing wet joint according to claim 2, characterized in that: The wet connector male connector (41) also includes a male connector cable (4114), which is inserted into the cable head column (411), with one end of the male connector cable (4114) extending upward from the upper end of the cable head column (411), and the other end of the male connector cable (4114) extending downward along the cable head column (411) to connect with the male connector conductive ring (416).

4. A cable casting and fishing wet joint according to claim 3, characterized in that: When the wet joint male head (41) is inserted into the wet joint female head (42), the male head conductive ring (416) and the female head conductive ring (427) are sealed, insulated and connected to each other; when the wet joint male head (41) is separated from the wet joint female head (42), the central channel of the wet joint female head (42) forms a channel for lowering a well logging instrument.

5. A cable casting and fishing wet joint according to claim 4, characterized in that: The wet joint male connector (41) further includes a counterweight block (4113), and the counterweight block (4113) is connected to the lower end of the insulating oil accommodating chamber (4111).

6. A cable casting and fishing wet joint according to claim 5, characterized in that: The wet connector male head (41) is provided with a locking structure, and the locking structure comprises a locking block (413) and a locking pin (412) provided on the outer peripheral surface of the cable head column (411) of the wet connector male head (41); when the wet connector male head (41) is lowered and inserted into the wet connector female head (42), when the locking block (413) is limited by the locking pin (412), the wet connector male head (41) and the upper ends of the wet connector female head (42) are locked and connected; when the wet connector male head (41) is pulled up, the locking pin (412) is disconnected, and the wet connector male head (41) and the wet connector female head (42) are separated.

7. A cable intelligent dispensing system, characterized by: The invention comprises a cable casting and salvaging wet joint according to any one of claims 2 to 6, a ground controller (1) and a tool segment (5), wherein the outer portion of the tool segment (5) is provided with an underground casing (2), the cable casting and salvaging wet joint is provided on the upper end of the tool segment (5) in the underground casing (2), and the tool segment (5) is connected to the ground controller (1) via the cable casting and salvaging wet joint.

8. The cable-based intelligent dispensing system according to claim 7, characterized in that: The wet joint male head (41) of the cable casting and salvaging wet joint is sleeved in the oil pipe (3) of the underground casing (2); the upper end of the wet joint male head (41) is connected to the ground controller (1) through a ground cable; the wet joint female head (42) of the cable casting and salvaging wet joint is connected to the tool section (5); the tool section (5) includes an intelligent dispenser (52); the intelligent dispenser (52) is connected to the wet joint female head (42) through the oil pipe (3); a steel pipe cable (51) is arranged in the oil pipe (3); the upper end of the steel pipe cable (51) is connected to the female head cable (4210) of the wet joint female head (42); the lower end of the steel pipe cable (51) is connected to the intelligent dispenser (52); and the lower end of the ground cable is connected to the male head cable (4114) of the wet joint male head (41).

9. A construction method of a cabled intelligent injection system according to claim 7 or 8, characterized in that: The steps include: Step S1: The tool section (5) is sequentially lowered from the wellhead of the injection well, and the steel pipe cable (51) of the tool section (5) passes through the interior of the oil pipe (3). The steel pipe cable (51) is connected from the intelligent injection device (52) at the bottom of the tool section (5) to the lower end of the wet joint female connector (42) at the top of the tool section (5); Step S2: The upper end of the tool section (5) is connected to the lower end of the wet joint female (42) of the cable casting wet joint, and the upper end of the wet joint female (42) is connected to the oil pipe (3) extending to the wellhead, completing the construction of the tool section (5); Step S3: Perform wellhead construction and ground controller (1) installation; Step S4: the surface controller (1) is connected to the wet joint male head (41) of the cable casting wet joint through the surface cable, so that the wet joint male head (41) is lowered into the well and docked with the wet joint female head (42); Step S5: After the wet joint male head (41) is lifted out of the tool section (5), a testing instrument for well logging is lowered through the central channel of the wet joint female head (42) to perform well logging operations.

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