A detachable wet joint butt joint cable intelligent acquisition system and method

Abstract

The application relates to a detachable wet joint butt joint cable intelligent acquisition system and method. The intelligent acquisition system comprises a well cementing casing, a wellhead sealing device and a ground control system are arranged at the upper end of the well cementing casing, an oil production pump, a wet joint, logging instruments and a downhole tool section are arranged in the well cementing casing, the upper end of the oil production pump is connected with the wellhead sealing device and the ground control system through a tubing and a steel pipe cable respectively, the wet joint comprises a male wet joint and a female wet joint, the male wet joint is detachably and sealingly connected with the female wet joint, the upper end of the male wet joint is connected with the oil production pump, when data measurement of crude oil of each layer at the lower end of the well cementing casing or the downhole tool section is needed, the male wet joint is separated from the female wet joint by pulling, the logging instruments are connected at the lower end of the male wet joint and pass through the female wet joint, then the logging instruments are connected with the downhole tool section to realize data measurement. The well cementing casing can be used for logging and maintenance work at any time without affecting the oil production efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of intelligent separate layer oil production in oil field, and particularly relates to a cable intelligent collection system and method with detachable wet joint butt joint. BACKGROUND

[0002] Fine intelligent separate layer oil production technology plays a great role in improving oil recovery of oil field. With continuous progress of technology, the process method of oil field in separate layer oil production field is continuously updated. At present, most oil wells control the oil production switch of each oil layer by a ground control system, and then transport the crude oil to the ground by a production pump for subsequent filtering, separation and storage.

[0003] In the actual oil production process, since the parameters of crude oil in each layer are constantly changing, it is necessary to test and analyze the crude oil in each layer. In the current production string structure, first, since the production pump does not have a central passage, when downhole testing is needed, the pipe string segment where the production pump is located needs to be pulled to the ground, and the wet joint used also does not have a central passage, so the logging instrument cannot test the parameters at different depths of the whole well section. Second, the production pump needs to be repaired regularly. The wet joint currently used gradually reduces the oil-water separation liquid after multiple butt joints, which reduces the reliability of butt joint, greatly affects the system parameters and data, causes errors in the collected data and actual data, and causes distortion of the collected data. When adding oil-water separation liquid, the entire wet joint needs to be pulled out, which not only increases the cost, but also reduces the oil production efficiency. SUMMARY

[0004] In order to solve the above problems, the present application provides a cable intelligent collection system and method with detachable wet joint butt joint. The wet joint is used as a boundary, the male head of the wet joint of the upper pipe string is connected with the coiled tubing and the production pump, the production pump is connected with the wellhead sealing device through the coiled tubing, the female head of the wet joint of the lower pipe string has a central passage, and the female head of the wet joint is connected with the downhole tool section through the coiled tubing. Whenever well logging or production pump repair is needed, the upper pipe string can be pulled to the ground, and subsequent operations can be performed without affecting the oil production efficiency, so that subsequent well logging and maintenance work can be performed.

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

[0006] A detachable wet joint docking cable intelligent acquisition system, comprising a cementing casing, the upper end of the cementing casing is provided with a wellhead sealing device and a ground control system, the inside of the cementing casing is sequentially provided with an oil pump connected through a tubing and a steel pipe cable, a wet joint, a logging instrument and a downhole tool section from top to bottom, the upper end of the oil pump is connected with the wellhead sealing device and the ground control system through the tubing and the steel pipe cable respectively, characterized in that: the wet joint comprises a wet joint male head and a wet joint female head, the center of the wet joint female head is provided with a central passage, the lower end of the wet joint male head is inserted into the central passage and detachably sealedly connected with the wet joint female head, when data measurement of each layer of crude oil at the lower end of the cementing casing or the downhole tool section is needed, the wet joint male head and the wet joint female head are separated by pulling, the lower end of the logging instrument is connected with the wet joint male head, then the wet joint male head and the wet joint female head are secondarily docked after the logging instrument passes through the wet joint female head, and the logging instrument is connected with the downhole tool section to realize data measurement.

[0007] Further, the lower end of the wet joint female head is sequentially connected with the logging instrument and the downhole tool section through a coiled tubing and a steel pipe cable, and the upper end of the wet joint male head is connected with the oil pump through a tubing and a steel pipe cable.

[0008] Further, the downhole tool section comprises a through-cable packer, a cable intelligent acquisition instrument and a fixed valve assembly which are sequentially connected through a tubing and a steel pipe cable, wherein the upper end of the through-cable packer is connected with the lower end of the wet joint female head.

[0009] Further, a group of through-cable packers and cable intelligent acquisition instruments are arranged in each layer of oil layer below the cementing casing, and the cable intelligent acquisition instrument in the lowermost layer is connected with the fixed valve assembly.

[0010] Further, the wet joint female head comprises a sleeve, the upper and lower ends of the sleeve are provided with end caps, the sleeve is sleeved with a ring sleeve, the ring sleeve is connected with the end cap at the lower end of the sleeve, the ring sleeve and the sleeve form a female head annular flow channel, the inner circumferential surface of the ring sleeve is sleeved with a female head conductive ring, the upper and lower ends of the female head conductive ring are provided with female head insulating sleeves sleeved on the inner circumferential surface of the ring sleeve, and the opposite two outer end portions of the pair of female head insulating sleeves are further provided with female head sealing rings sleeved on the inner circumferential surface of the ring sleeve; the inner circumferential surface of the end cap at the upper end of the sleeve is radially provided with a plurality of first liquid holes penetrating the female head annular flow channel, and the inner circumferential surface of the end cap at the lower end of the sleeve is radially provided with a plurality of second liquid holes penetrating the female head annular flow channel; the wet joint male head comprises a cable head column, the upper end of the cable head column is provided with a flow cavity, the bottom of the flow cavity is provided with a male head flow channel, the outer circumferential surface of the cable head column is sleeved with a male head conductive ring in contact with the female head conductive ring, the upper and lower ends of the male head conductive ring are provided with male head insulating sleeves sleeved on the outer circumferential surface of the cable head column, the opposite two outer end portions of the pair of male head insulating sleeves are provided with male head sealing rings sleeved on the outer circumferential surface of the cable head column, the lower end of the cable head column has an insulating oil containing cavity, the upper end of the insulating oil containing cavity is connected with the male head flow channel in a penetrating manner, and the inside of the insulating oil containing cavity is sequentially provided from top to bottom with an insulating oil one-way valve, a spring and a differential pressure sliding shaft; the radial direction of the insulating oil containing cavity at the upper end of the insulating oil one-way valve is provided with a plurality of third liquid holes penetrating the outer circumferential surface of the cable head column, the radial direction of the insulating oil containing cavity at the lower end of the differential pressure sliding shaft is provided with a plurality of fourth liquid holes penetrating the outer circumferential surface of the cable head column, and the insulating oil used for filling enters the insulating oil containing cavity from the fourth liquid hole, pushes the differential pressure sliding shaft to move upward, touches the spring to open the insulating oil one-way valve, and then flows out from the third liquid hole.

[0011] Further, the wet joint female head further comprises a female head cable, one end of the female head cable is connected to the female head conductive ring, and the other end of the female head cable extends downward along the ring sleeve to the end cap end portion at the lower end of the sleeve; the wet joint male head further comprises a male head cable joint, the male head cable joint is arranged on the outer circumferential surface of the flow cavity in the cable head column, the upper end of the male head cable joint is inserted with a ground cable, and the upper end of the flow cavity is connected with the oil pipe.

[0012] Further, when the wet joint male head is inserted into the wet joint female head, the lower end of the male head cable joint extends downward through the cable and connects with the male head conductive ring; the male head conductive ring and the female head conductive ring are mutually sealed, insulated and conductive; the male head flow channel and the female head annular flow channel are connected in communication; when the wet joint male head is separated from the wet joint female head, the central channel of the wet joint female head forms a channel for lowering the logging instrument.

[0013] Further, the wet joint male head further comprises a counterweight connected to the lower end of the insulating oil containing cavity.

[0014] Further, the wet joint male head is provided with a locking structure, the locking structure comprises a locking block arranged on the outer circumferential surface of the cable head column of the wet joint male head and a locking pin; when the wet joint male head is inserted into the wet joint female head, the wet joint male head and the wet joint female head are locked and connected at the upper end when the locking block is limited by the locking pin, the wet joint male head is pulled up, the locking pin is disconnected, and the wet joint male head and the wet joint female head are separated.

[0015] The application also provides a detachable wet joint docking cable intelligent acquisition method, comprising the following steps:

[0016] Step 1, after the wet joint female head, the logging instrument and the downhole tool section of the wet joint are connected in sequence through the oil pipe and the steel pipe cable, the wet joint is lowered to the specified depth of the cementing casing, the upper wellhead of the cementing casing is sealed, and the downhole tool section is pressed to seal the well;

[0017] Step 2, after the oil pump and the wet joint male head of the wet joint are connected in sequence through the oil pipe and the steel pipe cable, the wet joint male head is inserted into the wet joint female head, and the wet joint docking in the cementing casing is completed; at the same time, the ground control system and the wellhead sealing device are connected;

[0018] Step 3, the voltage and current parameters of the downhole tool section are read through the ground control system to determine whether the wet joint docking is reliable; if not, re-dock; if reliable, execute the next step;

[0019] Step 4, according to the temperature and pressure data of the oil layer to be exploited fed back by the downhole tool section, an instruction is sent to the cable intelligent acquisition instrument of the oil layer to be exploited, the oil pump is started, and the oil extraction work of the oil layer is completed;

[0020] Step 5, when it is necessary to measure the crude oil of each layer or the inside of the cementing casing at different depths, the upper section of the pipe string is pulled up, the wet joint male head and the wet joint female head are separated, the logging instrument is connected to the lower end of the wet joint male head, and the pipe string upper section is lowered again to complete the docking of the wet joint male head and the wet joint female head;

[0021] Step 6, the logging instrument is controlled through the ground control system and the real-time data collected by the logging instrument is received.

[0022] The application has the following advantages and effects due to the above technical scheme:

[0023] (1) The cable intelligent acquisition system and method provided by the application, the whole pipe string is divided into two sections by a wet joint, the male head of the wet joint of the upper section of the pipe string is connected through the coiled tubing and the oil pump, the oil pump is connected through the coiled tubing and the wellhead sealing device, the female head of the wet joint of the lower section of the pipe string has a central passage, the female head of the wet joint is connected through the coiled tubing and the downhole tool section, when well logging or repairing the oil pump is needed, the upper section of the pipe string is only needed to be pulled to the ground, and then subsequent operations can be carried out, and well logging and maintenance work can be carried out without affecting the oil production efficiency.

[0024] (2) The cable intelligent acquisition system and method provided by the application, because the female head of the wet joint has a large central passage, when testing is needed, the upper section of the pipe string is pulled out, the logging instrument is installed at the lower end of the male head of the wet joint, and the upper section of the pipe string is lowered into the well together, so that the measurement of parameters at different depths can be realized; meanwhile, because the female head of the wet joint has a separate oil production passage, the logging instrument can realize long-time real-time monitoring and measurement of data, but does not affect oil production work.

[0025] (3) The cable intelligent acquisition system and method provided by the application, when in use, the oil-water separation liquid can be placed on the male head of the wet joint, when the oil pump is repaired, the oil-water separation liquid can be supplemented, the damaged related parts can be replaced, the consistency of the contact resistance during multiple butt joints is ensured, the consistency of the influence of the whole pipe string cable on the acquisition and test results is ensured, and the authenticity of the acquisition and test results is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structure schematic view of the cable intelligent acquisition system with butt joint of the separable wet joint of the application.

[0027] Figure 2 It is a structure schematic view of the wet joint of the application.

[0028] Figure 3 It is an enlarged structure schematic view of the male head of the wet joint of the application.

[0029] Figure 4 It is an enlarged structure schematic view of the female head of the wet joint of the application.

[0030] Figure 5 It is a flow chart of the cable intelligent acquisition method with butt joint of the separable wet joint of the application.

[0031] 1-1 - cementing casing, 1-2 - oil pipe, 1-3 - oil pump, 1-4 - male head of wet joint, 1-5 - female head of wet joint, 1-6 - steel pipe cable, 1-7 - logging instrument, 1-8 - through-cable packer, 1-9 - cable intelligent acquisition instrument, 1-10 - fixed valve assembly, 1-11 - ground control system, 1-12 - wellhead sealing device;

[0032] 411 - cable head post, 412 - locking pin, 413 - locking block, 414 - male head upper sealing ring, 415 - male head upper insulating sleeve, 416 - male head conductive ring, 417 - male head lower insulating sleeve, 418 - male head lower sealing ring, 419 - insulating oil one-way valve, 4110 - spring, 4111 - insulating oil containing cavity, 4112 - differential pressure sliding shaft, 4113 - counterweight, 4114 - male head cable joint, 4115 - male head overcurrent passage, 4116 - overcurrent cavity.

[0033] 521 - upper end cover, 522 - post sleeve, 523 - ring sleeve, 524 - female head annular overcurrent passage, 525 - female head upper sealing ring, 526 - female head upper insulating sleeve, 527 - female head conductive ring, 528 - female head lower insulating sleeve, 529 - female head lower sealing ring, 5210 - female head cable, 5211 - lower end cover. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail with reference to the drawings, so that the purpose, features and advantages of the present application can be more clearly understood. It should be understood that the embodiments shown in the drawings are not a limitation on the scope of the present application, but only to illustrate the essential spirit of the technical solutions of the present application.

[0035] As Figure 1 , Figure 2The application provides a cable intelligent acquisition system, which comprises a well cementing casing 1-1, wherein the upper end of the well cementing casing 1-1 is provided with a wellhead sealing device 1-12 and a ground control system 1-11, the inner part of the well cementing casing 1-1 is sequentially provided, from top to bottom, with an oil extraction pump 1-3, a wet joint, a logging instrument 1-7 and a downhole tool section which are connected through a coiled tubing 1-2 and a steel pipe cable 1-6, and the upper end of the oil extraction pump 1-3 is connected with the Christmas tree of the wellhead sealing device 1-12 and the ground control system 1-11 through the coiled tubing 1-2 and the steel pipe cable 1-6, characterized in that the wet joint comprises a wet joint male head 1-4 and a wet joint female head 1-5, the center of the wet joint female head 1-5 is provided with a central passage, the lower end of the wet joint male head 1-4 is inserted into the central passage and detachably connected with the wet joint female head 1-5, and the upper end of the wet joint male head 1-4 is connected with the oil extraction pump 1-3 through the coiled tubing 1-2 and the steel pipe cable 1-6; when it is necessary to measure the data of the crude oil in each layer at the lower end of the well cementing casing 1-1 or the downhole tool section, the wet joint male head 1-4 is separated from the wet joint female head 1-5 by pulling, the logging instrument 1-7 is connected at the lower end of the wet joint male head 1-4, passes through the wet joint female head 1-5, and then the wet joint male head 1-4 is secondarily connected with the wet joint female head 1-5, so that the logging instrument 1-7 is connected with the downhole tool section to realize data measurement; at this time, the lower end of the wet joint female head 1-5 is connected with the upper end of the logging instrument 1-7 through the coiled tubing 1-2 and the steel pipe cable 1-6, and the logging instrument 1-7 is connected with the downhole tool section through the coiled tubing 1-2 and the steel pipe cable 1-6.

[0036] Further, the downhole tool section comprises a cable passing packer 1-8, a cable intelligent acquisition instrument 1-9 and a fixed valve assembly 1-10, which are connected through the coiled tubing 1-2 and the steel pipe cable 1-6, wherein the upper end of the cable passing packer 1-8 is connected with the lower end of the wet joint female head 1-5.

[0037] Specifically, it is bounded by a wet joint, through the wet joint male head 1-4 and oil pump 1-3 constitute the upper section of the string, the wet joint female head 1-5, logging instrument 1-7, through the cable packer 1-8, have intelligent acquisition instrument 1-9 and fixed valve assembly 1-10 constitute the lower section of the string, the wet joint male head 1-4 through the coiled tubing 1-2 and oil pump 1-3 connection, oil pump 1-3 through the coiled tubing 1-2 and wellhead sealing device 1-12 connection, the wet joint female head 1-5 due to the center channel, the wet joint female head 1-5 through the coiled tubing 1-2 and downhole tool section connection, whether it is needed to log or overhaul oil pump 1-3, only need to pull the string to the ground after the upper section, can carry out subsequent operation, in the case of not affecting the oil production efficiency, can carry out subsequent logging and maintenance work. Oil pump 1-3 for the crude oil pressurization acceleration, improve the oil production efficiency; the wet joint male head 1-4 and the wet joint female head 1-5 constitute a wet joint, realize the upper and lower separation and butt joint of the upper section of the string and the lower section of the string; through the steel pipe cable 1-6 realize the whole string upper and lower section communication and signal transmission, logging instrument 1-7 according to the actual demand at any time for downhole testing parameters. The wet joint male head 1-4 and the wet joint female head 1-5 are inserted and connected, the tubing 1-2 and all downhole instruments are connected through threaded connection, and the connection is tightened by using a standard pipe wrench.

[0038] Further, a set of through cable packer 1-8 and have intelligent acquisition instrument 1-9 are arranged in each oil layer below the cementing casing 1-1, and the lowermost have intelligent acquisition instrument 1-9 is connected with the fixed valve assembly 1-10.

[0039] Specifically, the cementing casing 1-1 provides an oil production channel for the tubing 1-2 and provides switching and tension between instruments, according to different oil layer numbers, a set of through cable packer 1-8 and have intelligent acquisition instrument 1-9 can be lowered in each oil layer, the through cable packer 1-8 in each layer realizes the sealing between each oil layer, prevents oil exchange, and maintains different pressures of each oil layer, the have intelligent acquisition instrument 1-9 in each layer realizes oil production work of different oil layers and collects parameters such as temperature, pressure and flow of different oil layers, the through cable packer 1-8 and the have intelligent acquisition instrument 1-9 in each layer are connected through the coiled tubing 1-2, the coiled tubing connection is connected by corresponding tubing 1-2 collars, and the threaded connection is tightened by using a pipe wrench; the lowermost have intelligent acquisition instrument 1-9 is connected with the fixed valve assembly 1-10 through the tubing 1-2, the fixed valve assembly 1-10 includes a valve, a screen pipe and a plug connected through the tubing 1-2 in sequence, and the fixed valve assembly 1-10 prevents oil backflow without affecting oil production.

[0040] As Figure 3 , Figure 4Further, the wet connector male head 1-4 and the wet connector female head 1-5 are sealed, and after the wet connector male head 1-4 is pulled out, the central inner cavity of the wet connector female head 1-5 is used as a passage of the lower pipe column. The wet connector female head 1-5 comprises a column sleeve 522 and a female cable 5210, the upper and lower ends of the column sleeve 522 are provided with end covers, the column sleeve 522 is sleeved with a ring sleeve 523, the ring sleeve 523 is connected with the end cover at the lower end of the column sleeve 522, the ring sleeve 523 and the column sleeve 522 form a female annular flow passage 524, the inner circumferential surface of the ring sleeve 523 is sleeved with a female conductive ring 527, the upper and lower ends of the female conductive ring 527 are provided with female insulating sleeves sleeved on the inner circumferential surface of the ring sleeve 523, and the opposite two outer end portions of the pair of female insulating sleeves are further provided with female sealing rings sleeved on the inner circumferential surface of the ring sleeve 523. A plurality of first liquid holes penetrating the female annular flow passage 524 are radially distributed on the inner circumferential surface of the end cover at the upper end of the column sleeve 522, and a plurality of second liquid holes penetrating the female annular flow passage 524 are radially distributed on the inner circumferential surface of the end cover at the lower end of the column sleeve 522. One end of the female cable 5210 is connected to the female conductive ring 527, and the other end of the female cable 5210 extends downward along the ring sleeve 523 to the end cover at the lower end of the column sleeve 522.

[0041] Specifically, the wet connector female head 1-5 is a circular pipe body structure, and the inside is penetrated from top to bottom to form a central passage. The lower end of the wet connector female head 1-5 can be connected with the tool section tubing 1-2. The column sleeve 522 is an annular cylinder, and the upper and lower ends are provided with annular grooves. The end cover comprises an upper end cover 521 and a lower end cover 5211, and the end portions of the upper end cover 521 and the lower end cover 5211 are provided with stepped surfaces matched with the annular grooves at the upper and lower ends of the column sleeve 522. The column sleeve 522 and the upper end cover 521 and the lower end cover 5211 are sealingly connected with a nut or an interference fit. The inner cavity of the upper end cover 521 is a tapered cavity for facilitating the flow of liquid and the insertion of the wet connector male head 1-4, and a plurality of first liquid holes are opened on the inner cavity wall of the upper end cover 521 and axially penetrate the inner cavity of the upper end cover 521 and the upper end of the flow passage 524. The inner cavity of the lower end cover 5211 is a tapered cavity for facilitating the flow of liquid, and a plurality of second liquid holes are opened on the inner cavity wall of the lower end cover 5211 and axially penetrate the inner cavity of the lower end cover 5211 and the lower end of the flow passage 524. The first liquid holes, the second liquid holes and the flow passage 524 communicate to form a water injection channel. When the wet connector male head 1-4 is inserted into the central passage of the wet connector female head 1-5, the water injection channel can be used as a water injection channel instead of the central passage.

[0042] The ring sleeve 523 is also a ring-shaped cylinder, and an accommodating female cable 5210 first cable passage is axially arranged on the lower end sleeve wall of the ring sleeve 523. The upper end of the first cable passage penetrates the sleeve wall and communicates with the female conductive ring 527. The upper end of the female cable 5210 extends along the first cable passage to the female conductive ring 527 and is connected thereto. An axial second cable passage is arranged on the inner wall of the lower end cover 5211 and penetrates the first cable passage on the ring sleeve 523. The second cable passage penetrates the upper and lower end faces of the lower end cover 5211. The lower end of the female cable 5210 extends along the second cable passage to the end of the lower end cover 5211. The female sealing ring includes a female upper sealing ring 525 and a female lower sealing ring 529. The female insulating sleeve includes a female upper insulating sleeve 526 and a female lower insulating sleeve 528. The female upper insulating sleeve 526 and the female lower insulating sleeve 528 are arranged at the two ends of the female conductive ring 527 to insulate the female conductive ring 527. The female upper sealing ring 525 and the female lower sealing ring 529 are arranged at the two ends of the female upper insulating sleeve 526 and the female lower insulating sleeve 528, respectively, to seal the female conductive ring 527.

[0043] Further, the wet connector male head 1-4 includes a cable head column 411 and a male cable joint 4114. The cable head column 411 is provided with an overflow cavity 4116 at the upper end. The bottom of the overflow cavity 4116 is provided with a male overflow passage 4115. The male cable joint 4114 is arranged outside the overflow cavity 4116 in the cable head column 411. The outer periphery of the cable head column 411 is provided with a male conductive ring 416 in contact with the female conductive ring 527. The upper and lower ends of the male conductive ring 416 are provided with male insulating sleeves arranged outside the outer periphery of the cable head column 411. The opposite two outer end portions of the pair of male insulating sleeves are further provided with male sealing rings arranged outside the outer periphery of the cable head column 411. The lower end of the cable head column 411 has an insulating oil containing cavity 4111. The inside of the insulating oil containing cavity 4111 is sequentially provided with an insulating oil one-way valve 419, a spring 4110, and a differential pressure sliding shaft 4112 from top to bottom. The radial direction of the insulating oil containing cavity 4111 at the upper end of the insulating oil one-way valve 419 is provided with a plurality of third liquid holes penetrating the outer periphery of the cable head column 411. The radial direction of the insulating oil containing cavity 4111 at the lower end of the differential pressure sliding shaft 4112 is provided with a plurality of fourth liquid holes penetrating the outer periphery of the cable head column 411. The insulating oil used for filling enters the lower part of the insulating oil containing cavity 4111 from the fourth liquid hole, pushes the differential pressure sliding shaft 4112 to move upward, touches the spring 4110, and extrudes the insulating oil one-way valve 419 to open, 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 extends downward along the cable head column 411 and connects with the male conductive ring 416.

[0044] Specifically, the cable head column 411 is a cylindrical cavity structure, the overflow cavity 4116 at the upper end of the cable head column 411 is a cylindrical cavity, the inner cavity surface of the overflow cavity 4116 has internal threads, and the internal threads are threadedly connected with the coiled tubing 1-2 and achieve sealing. The inside of the cable head column 411 is provided with a third cable passage, the lower end of the third cable passage penetrates the cable head column 411 radially and is opposite to the male head conductive ring 416, and the lower end of the male head cable connector 4114 extends from the third cable passage through the cable and is connected with the inner ring surface of the male head conductive ring 416. The male head overflow passage 4115 at the bottom of the overflow cavity 4116 is arranged at the outer periphery of the third cable passage, the axial direction of the male head overflow passage 4115 is a waist-shaped structure, the radial direction is a C-shaped structure, and the lower end of the male head overflow passage 4115 penetrates the outer peripheral surface of the cable head column 411. The upper end of the cable head column 411 is connected with the coiled tubing 1-2, and the male head cable connector 4114 is inserted into the surface cable.

[0045] 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. The male head upper insulating sleeve 415 and the male head lower insulating sleeve 417 are arranged at the two ends of the male head conductive ring to insulate 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 the two ends of the male head upper insulating sleeve 415 and the male head lower insulating sleeve 417 to seal the male head conductive ring 416. When the male head 1-4 and the female head 1-5 of the wet connector are inserted into each other, the male head conductive ring 416 and the female head conductive ring 527 are in sealing, insulating and conductive connection; the third liquid hole and the fourth liquid hole form annular conductive connection of the insulating oil, so that the insulating oil one-way valve 419 is opened and closed, and the male head overflow passage 4115 is in communication with the female head annular overflow passage 524 for liquid overflow.

[0046] Further, when the male head 1-4 of the wet connector is inserted into the female head 1-5 of the wet connector, the male head conductive ring 416 and the female head conductive ring 527 are in sealing, insulating and conductive connection; when the male head 1-4 of the wet connector is separated from the female head 1-5 of the wet connector, the central passage of the female head 1-5 of the wet connector forms a passage for lowering the logging instrument 1-7. When the male head 1-4 and the female head 1-5 of the wet connector are inserted into each other, the male head conductive ring 416 and the female head conductive ring 527 are in close contact and conductive connection, at this time, a pair of male head insulating sleeves and a pair of female head insulating sleeves are in close contact to insulate the two ends of the male head conductive ring 416 and the female head conductive ring 527, and a pair of male head sealing rings and a pair of external sealing rings are in close contact to seal the two ends of the pair of female head insulating sleeves and the pair of male head insulating sleeves.

[0047] Specifically, when the wet connector male head 1-4 is inserted into the wet connector female head 1-5, the wet connector male head 1-4 is responsible for the butt joint with the wet connector female head 1-5, and after the butt joint of the wet connector male head 1-4 and the wet connector female head 1-5, the electrical connection and the sealing insulation between the cable and the downhole cable type electric sealing integrated intelligent injection instrument 52 are realized together. After the butt joint and sealing of the wet connector male head 1-4 and the wet connector female head 1-5, a cavity conductive cavity is formed between the upper and lower sealing surfaces, and the exchange of internal and external liquids between the insulating oil in the conductive cavity and the injected water in the oil pipe 1-2 can be prevented.

[0048] When the wet connector male head 1-4 and the wet connector female head 1-5 are inserted and matched with each other, the wet connector male head 1-4 completes the sealing of the upper and lower sealing surfaces under the action of its own gravity and impact, and the locking mechanism realizes the locking function to prevent the instrument from moving upward, and the insulating oil one-way valve 419 relies on the side wall of the wet connector female head 1-5 to complete the unlocking, at this time the inner cavity of the wet connector female head 1-5 and the insulating oil containing cavity 4111 are communicated. Because 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, injecting the insulating oil in the insulating 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 insulating oil, and the insulating effect of the male head conductive ring 416 and the female head conductive ring 527 with the external environment is realized. The residual water in the conductive cavity is discharged, and the insulating oil is filled by the automatic oil injection mechanism.

[0049] The wet connector female head 1-5 has a central channel and a female head annular flow passage 524, the central channel is used for butt joint with the wet connector male head 1-4, and the female head annular flow passage 524 is used for liquid passing. When the wet connector male head 1-4 needs to be removed, the cable head column 411 is driven to move upward by pulling the cable, at this time the locking mechanism is invalid, and the wet connector male head 1-4 and the wet connector female head 1-5 are separated. After the wet connector male head 1-4 is lifted, the central channel of the wet connector female head 1-5 can be used as a logging instrument channel. When the wet connector male head 1-4 is butt jointed with the wet connector female head 1-5 again, only the insulating oil needs to be supplemented, and the damaged parts need to be replaced.

[0050] Further, the wet connector male head 1-4 further comprises a counterweight 4113 connected to the lower end of the insulating oil containing cavity 4111. The counterweight 4113 is threadedly and sealingly connected to the lower end of the insulating oil containing cavity 4111 at the lower end of the wet connector male head 1-4. The holding of the counterweight 4113 increases the gravity of the wet connector male head 1-4, so that the wet connector male head 1-4 can rely on its own gravity to complete the butt joint with the wet connector female head 1-5.

[0051] Further, the wet connector male head 1-4 is provided with a locking structure, which includes a locking block 413 provided on the outer periphery of the cable head column 411 of the wet connector male head and a locking pin 412. When the locking block 413 is limited by the locking pin 412, the wet connector male head 1-4 and the upper end of the wet connector female head 1-5 are locked and connected. When the locking pin 413 is disconnected, the wet connector male head 1-4 and the wet connector female head 1-5 are disconnected. The cable head column 411 is connected with the ground cable, and can provide suspension force and conductive and communication functions.

[0052] Specifically, the outer periphery of the cable head column 411 at the upper end of a pair of male head sealing rings is provided with a locking structure for locking and connecting the inner periphery of the upper end of the wet connector female head 1-5. When the locking block 413 of the locking structure is limited by the locking pin 412, the cable head column 411 and the upper end of the wet connector female head 1-5 are locked and connected. When the locking pin 412 is disconnected, the cable head column 411 is disconnected from the central passage of the wet connector female head 1-5.

[0053] The locking block 413 is radially distributed along the outer periphery of the cable head column 411. A locking groove is formed on the outer periphery 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 periphery 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. A torsion spring is arranged on the upper surface of the locking block 413 in the locking groove, and the torsion spring is embedded between the locking groove and the locking block 413 to provide elastic force for the downward rebound of the locking block.

[0054] The locking structure mainly provides locking force after the wet connector male head 1-4 and the wet connector female head 1-5 are connected, to prevent the wet connector male head 1-4 from being disconnected from the wet connector female head 1-5. When the wet connector male head 1-4 is lowered, the locking block 413 compresses the torsion spring, the locking block 413 rotates upward to retract, the wet connector male head 1-4 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 periphery 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 of the wet connector female head 42 upward. Therefore, the locking block 413 cannot move upward to achieve clamping.

[0055] When the locking structure is unlocked, the cable head column 411 of the wet joint male head 1-4 is pulled upward, and when the pulling force exceeds the ultimate shear stress of the locking pin 412, the cable head column 411 shears the locking pin 412, a small distance displacement of the cable head column 411 relative to the locking pin 412 occurs, the cable head column 411 and the locking pin 412 are separated, the limitation of the locking pin 412 to the locking block 413 is released, at this time, the locking block rotates downward due to the torsional spring effect and is retracted, and the wet joint male head 1-4 can be smoothly pulled out through the necked section of the upper end cover of the wet joint female head 1-5. In order to facilitate shearing, the locking pin 412 is preferably a copper pin.

[0056] As shown in Figure 5 The application also provides a detachable wet joint docking cable intelligent acquisition method, which comprises the following steps:

[0057] Step 1), the wellhead chuck and the cable car are used in cooperation, the wet joint female head 1-5, the logging instrument 1-7, the cable-penetration packer 1-8, the cable intelligent acquisition instrument 1-9 and the fixed valve assembly 1-10 of the lower section of the pipe string are sequentially connected through the oil pipe 1-2 and the steel pipe cable 1-6 in a way of connecting and tightening section by section, and then the cable car is used to suspend and lower them to the designated depth of the cementing casing 1-1, and the cable intelligent acquisition instrument 1-9 needs to be ensured in a closed state before being lowered into the well; the wellhead of the sealed cementing casing 1-1 is sealed, and the cable-penetration packer 1-8 is pressed to be sealed.

[0058] Specifically, according to the different number of oil layers, a group of cable-penetration packers 1-8 and cable intelligent acquisition instruments 1-9 can be lowered for each oil layer, the cable-penetration packer 1-8 of each layer realizes the sealing between each oil layer, prevents oil exchange and maintains different pressures of each oil layer, the cable intelligent acquisition instrument realizes the oil production work of different oil layers and acquires parameters such as temperature, pressure and flow of different oil layers, the cable-penetration packer 1-8 and the cable intelligent acquisition instrument 1-9 of each layer are connected through the coiled tubing 1-2, the lowermost cable intelligent acquisition instrument 1-9 is connected with the fixed valve assembly 1-10 through the oil pipe 1-2, and the fixed valve assembly 1-10 comprises a valve, a screen pipe and a plug which are sequentially connected through the oil pipe.

[0059] Step 2), the wellhead chuck and the cable car are used in cooperation again, the oil production pump 1-3 and the wet joint male head 1-4 of the upper section of the pipe string are sequentially connected through the oil pipe 1-2 and the steel pipe cable 1-6 in a way of connecting and tightening section by section, and then the cable car is used to suspend and lower them to make the wet joint male head 1-4 be inserted into the wet joint female head 1-5, complete the docking of the wet joint in the cementing casing 1-1, connect the ground control system 1-11 and the wellhead sealing device 1-12, and complete the docking of the upper section and the lower section of the pipe string.

[0060] Step 3) reading the voltage, current and other parameters in the downhole tool section through the ground control system 1-11 to determine whether the wet joint is reliably connected; if not, re-connect; after determining that the wet joint is reliably connected, execute the next step;

[0061] Step 4) according to the temperature, pressure and other data of the required oil layer obtained from the over-cable packer 1-8, the intelligent acquisition instrument 1-9 and the fixed valve assembly 1-10 of each layer of the downhole tool section, issuing an instruction to the intelligent acquisition instrument 1-9 of the oil layer to open the throttle valve and start the oil pump 1-3, and complete the oil extraction work of the oil layer; when the oil is extracted from each layer of oil, the intelligent acquisition instrument 1-9 of the corresponding oil layer can collect the flow data of the crude oil in real time and send it to the ground control system 1-11, which is convenient for the subsequent processing of the oil layer.

[0062] Step 5) when it is necessary to measure the inside of the upper and lower sections of the pipe string at different depths in the casing 1-1, only the upper section of the pipe string needs to be pulled up to separate the male wet joint 1-4 and the female wet joint 1-5, replace the consumable and damaged parts on the male wet joint 1-4, and repair the oil pump 1-3, then connect the logging instrument 1-7 to the lower end of the male wet joint 1-4, and lower the upper section of the pipe string in the same way as described above, and again connect the male wet joint 1-4 and the female wet joint 1-5.

[0063] Step 6) controlling the logging instrument 1-7 to receive the real-time data collected by the logging instrument 1-7 through the ground control system 1-11. Of course, if the logging instrument 1-7 uses armored cable, the logging instrument 1-7 can be lowered directly using the cable car to complete real-time data collection and oil extraction.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can be modified or some technical features can be replaced by equivalents; 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 cabled intelligent data acquisition system with a detachable wet joint connection, comprising a cementing casing (1-1), wherein the upper end of the cementing casing (1-1) is provided with a wellhead sealing device (1-12) and a ground control system (1-11), wherein the interior of the cementing casing (1-1) is provided with an oil production pump (1-3), a wet joint, a logging instrument (1-7), and a downhole tool section connected via an oil pipe (1-2) and a steel pipe cable (1-6) in sequence from top to bottom, wherein the upper end of the oil production pump (1-3) is connected to the wellhead sealing device (1-12) and the ground control system (1-11) via the oil pipe (1-2) and the steel pipe cable (1-6), respectively, and wherein: The wet joint comprises a wet joint male head (1-4) and a wet joint female head (1-5); a central channel is provided at the center of the wet joint female head (1-5); the lower end of the wet joint male head (1-4) is inserted into the central channel and is detachably sealedly connected to the wet joint female head (1-5); when data measurement is required for each layer of crude oil at the lower end of the cementing casing (1-1) or a downhole tool section, the wet joint male head (1-4) is pulled apart from the wet joint female head (1-5); the logging instrument (1-7) is connected to the lower end of the wet joint male head (1-4) and passes through the wet joint female head (1-5); the wet joint male head (1-4) and the wet joint female head (1-5) are then docked for a second time, and the logging instrument (1-7) is connected to the downhole tool section to realize data measurement; The wet connector female head (1-5) comprises a column sleeve (522), the upper and lower ends of the column sleeve (522) are both provided with end caps, a ring sleeve (523) is sleeved inside the column sleeve (522), the ring sleeve (523) is connected to the end cap at the lower end of the column sleeve (522), a female head annular flow passage (524) is formed between the ring sleeve (523) and the column sleeve (522), a female head conductive ring (527) is sleeved on the inner circumference of the ring sleeve (523), the upper and lower ends of the female head conductive ring (527) are both provided with a female head insulating sleeve sleeved on the inner circumference of the ring sleeve (523), and a pair of the female head insulating sleeves are connected to each other. The two outer ends of the pair are also provided with a female sealing ring sleeved on the inner circumference of the annular sleeve (523); the inner circumference of the end cover at the upper end of the column sleeve (522) is radially distributed with a plurality of first liquid holes that are connected to the female annular flow channel (524), and the inner circumference of the end cover at the lower end of the column sleeve (522) is radially distributed with a plurality of second liquid holes that are connected to the female annular flow channel (524); the wet joint male head (1-4) includes a cable head column (411), the upper end of the cable head column (411) is provided with a flow cavity (4116), and the bottom of the flow cavity (4116) is provided with a male head flow channel ( 4115), the outer circumference of the cable head column (411) is provided with a male conductive ring (416) in contact with the female conductive ring (527), the upper and lower ends of the male conductive ring (416) are both provided with male insulating sleeves sleeved on the outer circumference of the cable head column (411), and a pair of male insulating sleeves are provided with male sealing rings 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 one-way valves (419) in sequence from top to bottom. , 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); the 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. The cabled intelligent data acquisition system with detachable wet joint according to claim 1, characterized in that: The lower end of the wet joint female head (1-5) is connected to the well logging instrument (1-7) and the downhole tool section in sequence through the connecting oil pipe (1-2) and the steel pipe cable (1-6), and the upper end of the wet joint male head (1-4) is connected to the oil production pump (1-3) through the oil pipe (1-2) and the steel pipe cable (1-6).

3. A cabled intelligent data acquisition system with detachable wet joint according to claim 1 or 2, characterized in that: The downhole tool section comprises a cable packer (1-8), a cabled intelligent acquisition instrument (1-9), and a fixed valve assembly (1-10) which are sequentially connected through an oil pipe (1-2) and a steel pipe cable (1-6), wherein the upper end of the cable packer (1-8) is connected to the lower end of the wet joint female head (1-5).

4. The cabled intelligent data acquisition system with detachable wet joint according to claim 3, characterized in that: A set of cable packers (1-8) and cable intelligent collectors (1-9) are provided in each oil layer below the cementing casing (1-1), and the cable intelligent collector (1-9) at the bottom is connected to the fixed valve assembly (1-10).

5. The cabled intelligent data acquisition system with detachable wet joint according to claim 4, characterized in that: The wet connector female (1-5) further comprises a female cable (5210), one end of which is connected to the female conductive ring (527), and the other end of which extends downward along the ring sleeve (523) to the end cap end of the lower end of the column sleeve (522); the wet connector male (1-4) further comprises a male cable connector (4114), which is arranged on the periphery of the flow cavity (4116) in the cable head column (411), and the upper end of the male cable connector (4114) is plugged with a ground cable, and the upper end of the flow cavity (4116) is connected to the oil pipe (1-2).

6. The cabled intelligent data acquisition system with detachable wet joint according to claim 5, characterized in that: When the wet joint male connector (1-4) is inserted into the wet joint female connector (1-5), the lower end of the male cable connector (4114) extends downward through the cable to connect with the male conductive ring (416); the male conductive ring (416) and the female conductive ring (527) are sealed, insulated and connected to each other; the male flow passage (4115) is connected to the female annular flow passage (524); when the wet joint male connector (1-4) is separated from the wet joint female connector (1-5), the central channel of the wet joint female connector (1-5) forms a channel for lowering the well logging instrument (1-7).

7. The cabled intelligent data acquisition system with detachable wet joint according to claim 6, characterized in that: The wet joint male connector (1-4) further includes a counterweight block (4113), and the counterweight block (4113) is connected to the lower end of the insulating oil accommodating chamber (4111).

8. The cabled intelligent data acquisition system with detachable wet joint according to claim 7, characterized in that: The wet connector male head (1-4) 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 (1-4); when the wet connector male head (1-4) is lowered and inserted into the wet connector female head (1-5), the upper ends of the wet connector male head (1-4) and the wet connector female head (1-5) are locked and connected when the locking block (413) is limited by the locking pin (412); when the wet connector male head (1-4) is pulled up, the locking pin (412) is disconnected, and the wet connector male head (1-4) and the wet connector female head (1-5) are separated.

9. A cabled intelligent data acquisition method for detachable wet-joint docking, using a cabled intelligent data acquisition system for detachable wet-joint docking according to any one of claims 1 to 8, characterized in that: The collection method comprises the following steps: Step 1: After the wet joint female head (1-5), the logging instrument (1-7) and the downhole tool section are connected in sequence through the oil pipe (1-2) and the steel pipe cable (1-6), they are lowered to the specified depth of the cementing casing (1-1), the wellhead at the upper end of the cementing casing (1-1) is sealed, and pressure is applied to seal the downhole tool section; Step 2: Connect the oil pump (1-3) and the wet joint male connector (1-4) in sequence through the oil pipe (1-2) and the steel pipe cable (1-6), and then lower the oil pump (1-3) so that the wet joint male connector (1-4) is plugged into the wet joint female connector (1-5) to complete the wet joint docking; and simultaneously connect the ground control system (1-11) and the wellhead sealing device (1-12); Step 3, reading the voltage and current parameters of the downhole tool section through the ground control system (1-11) to determine whether the wet joint connection is reliable; if it is not reliable, reconnect; if it is determined that the connection is reliable, proceed to the next step; Step 4: Based on the temperature and pressure data of the oil layer to be produced fed back by the downhole tool section, a command is issued to the cable intelligent data acquisition instrument (1-9) of the oil layer to start the oil production pump (1-3) to complete the oil production work of the oil layer; Step 5: When it is necessary to measure the inside of each layer of crude oil or the cementing casing (1-1) at different depths, the entire upper section of the pipe string is pulled up to separate the wet joint male head (1-4) and the wet joint female head (1-5), and the logging instrument (1-7) is connected to the lower end of the wet joint male head (1-4), and the upper section of the pipe string is lowered again to complete the docking of the wet joint male head (1-4) and the wet joint female head (1-5); Step 6: Control the logging instrument (1-7) through the ground control system (1-11) and receive the real-time data collected and fed back by the logging instrument (1-7).

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