Independently controlled multi-barrel sampling nipple

Abstract

The utility model provides an independent control multi-barrel sampling nipple, which comprises an upper joint, a sampling part, a control part and a lower joint which are connected in sequence, the upper joint and the lower joint are connected together through a base body, and a hydraulic oil channel, a cable channel and a sample channel are arranged in the upper joint, the base body and the lower joint; the sampling part comprises four sampling barrels, four barrel grooves extending in the axial direction are formed in the base body, and each sampling barrel is installed in the corresponding barrel groove; the control part comprises four control valves and a master control valve, and the four control valves and the master control valve are installed in valve holes formed in the end, close to the lower connector, of the base body in the axial direction. The four sampling barrels can be installed on one base body at the same time, each sampling barrel can be controlled to work independently, sampling can be carried out four times when the sampling barrel descends into a well once, the sampling efficiency when the sampling barrel descends into the well once is greatly improved, in addition, the four sampling barrels are installed in a surrounding mode, the length of the whole sampling short section is reduced, and the sampling efficiency is improved. And hitching of the whole sampling nipple and other measuring nipples is more convenient.

Description

Technical Field

[0001] The utility model relates to the field of petroleum exploration, in particular to a multi-barrel sampling pup joint which is equipped with multiple sampling barrels and can control the sampling processes of the barrels respectively. Background Art

[0002] In the field of oil exploration, it is necessary to understand the specific parameters of the downhole formation during the drilling process. Generally, a sampling sub with a sampling barrel is installed. The sampling of the current formation is carried out while drilling to a predetermined position downhole, and then the samples are brought back to the surface for analysis.

[0003] The existing sampling pup section can generally only achieve one sampling, that is, only one sampling bucket is installed. Each time a formation sample is collected, it is necessary to return to the ground for extraction. When sampling is required at multiple depths in the same well, it is necessary to go down the well multiple times. Going up and down is not only time-consuming and labor-intensive, but also inefficient. In response to this situation, there are currently sampling pup sections with two sampling buckets installed, which can achieve the collection of formation samples from two locations in one trip, such as the patent with application number: 202020986583.0. Although this solution can achieve two samplings in one trip, which relatively improves efficiency, it arranges the two sampling buckets in sequence on the pup section, which increases the length of the measuring pup section. Moreover, as far as existing downhole measurements are concerned, the same well often needs to be sampled as many as four to ten times. The efficiency of this solution still cannot meet current needs.

[0004] In addition, installing multiple sampling barrels on a sampling short section cannot be achieved simply by increasing the number of sampling barrels. It is necessary to overcome problems such as how each barrel can work independently and how to control them separately. In addition, the diameter of the drill pipe is generally between 50 and 150MM. The larger the diameter, the smaller the distance relative to the well wall, and the greater the influence of the internal mud on the drill pipe. The smaller the diameter, the farther the distance relative to the well wall, and the smoother the relative movement of the drill pipe. Therefore, the added sampling barrel structure also needs to be able to be smoothly raised and lowered underground.

[0005] In summary, the purpose of this solution is to reduce the length of the measuring sub and achieve sampling at multiple locations in one trip, while considering how to control each sampling bucket to work independently. Utility Model Content

[0006] The utility model aims to provide a multi-barrel sampling short section which is equipped with a plurality of sampling barrels at the same time and can control the sampling process of each barrel separately.

[0007] Specifically, the utility model provides an independently controlled multi-barrel sampling nipple, comprising an upper joint, a sampling portion, a control portion, and a lower joint connected in sequence, wherein:

[0008] The sampling unit and the control unit are installed on the base, and the upper joint and the lower joint are respectively installed at both ends of the base. The unconnected ends of the upper joint and the lower joint are used to connect other short sections. The upper joint, the base and the lower joint are provided with interconnected hydraulic oil channels, sample channels and cable channels.

[0009] The sampling part includes four cylindrical detachable sampling barrels. The surface of one end of the base body close to the upper joint is symmetrically provided with four axially extending barrel grooves around the axis, and each sampling barrel is installed in a barrel groove;

[0010] The control part includes four control valves that control four sampling barrels respectively and a master control valve. The four control valves control the four sampling barrels respectively through the sample channels in the base. The master control valve controls the operation of each control valve through the hydraulic oil channel, the sample channel and the cable channel. The four control valves and the master control valve are installed in the valve holes arranged axially at one end of the base near the lower joint.

[0011] In one embodiment of the present invention, a locking ring with a mud channel is installed at one end of each sampling barrel close to the upper joint, and a sample valve seat connected to the sample channel is installed at one end close to the lower joint, and a mud piston and a sample piston are installed inside, wherein a mud cavity is formed between the mud piston and the locking ring, a nitrogen cavity is formed between the mud piston and the sample piston, and a sample cavity is formed between the sample piston and the sample valve seat.

[0012] In another embodiment of the present invention, a gas one-way valve and a pressure detector for injecting nitrogen into the nitrogen chamber are installed on the mud piston, and a sealing gas sealing plug is installed at the inlet end of the gas one-way valve.

[0013] In another embodiment of the present invention, one end of the locking ring close to the upper joint protrudes from the front end of the sampling barrel, and an inwardly concave arc groove and a detachable semi-annular lock buckle are provided at a position opposite to the barrel groove and the protruding end of the locking ring. The protruding end of the locking ring is inserted into the inwardly concave arc groove and fixed in the barrel groove by the semi-annular lock buckle.

[0014] In another embodiment of the present invention, one end of the sample valve seat is screwed into the sampling barrel through a thread, and the other end protrudes from the sampling barrel, a valve seat channel is provided inside the sample valve seat, and a hydraulic isolation valve for controlling the on-off of the valve seat channel is installed on the protruding end, and the side of the protruding end facing the barrel groove is an axial plane, a protruding platform is provided on the barrel groove at a position opposite to the axial plane, a sample channel outlet is provided on the protruding platform, and a valve seat channel inlet connected to the valve seat channel is provided on the axial plane, and the sample valve seat is fixed in the barrel groove by bolts after being fitted with the protruding platform through the axial plane.

[0015] In another embodiment of the present invention, an axial valve seat groove is opened at the position where the control valve and the master control valve are installed in the base, a removable valve seat is installed in the valve seat groove, the valve hole is arranged on the removable valve seat, the hydraulic oil channel, the sample channel and the cable channel in the base are connected with each valve hole through a branch pipe respectively, and a sealing plug inserted into the surface of the removable valve seat is installed on each branch pipe, and the sealing plug includes an oil pressure sealing plug for controlling the opening of the hydraulic oil channel of each control valve respectively, and a detection sealing plug for detecting the pressure of each sampling barrel respectively.

[0016] In another embodiment of the present invention, two valve seat grooves are provided, and one detachable valve seat is installed in each groove, and each detachable valve seat is fixed in the corresponding valve seat groove by a bolt;

[0017] Concave limiting grooves corresponding to the positions of the valve holes are provided at the bottom of the valve seat groove, and convex blocks with shapes corresponding to the concave limiting grooves are provided at the bottom of the detachable valve seat corresponding to the valve holes.

[0018] In another embodiment of the present invention, the cable channel where the sampling barrel is installed is arranged on the axial center line of the base, the hydraulic oil channel and the sample channel are arranged in the side walls between adjacent barrel grooves, and the hydraulic oil channel, the sample channel and the cable channel where the detachable valve seat is installed are arranged in the base.

[0019] In another embodiment of the present invention, the master control valve includes a circuit module and two normally closed modules respectively installed in the three valve holes, wherein the circuit module is used to connect to the cable channel, and the two normally closed modules are used to communicate with the hydraulic oil channel respectively, and the circuit module controls the two normally closed modules through cables;

[0020] Each normally closed module is respectively installed with 2 to 3 normally closed solenoid valves, which are inserted into the grooves in the valve hole and then fixed in the valve hole through a pressing plate.

[0021] In another embodiment of the present invention, the upper joint includes an upper intermediate joint and two fixing clamps formed by two half rings. Four channels are axially arranged inside the upper intermediate joint, and an outer surface is provided with an outer convex retaining ring with the same diameter as the base body. An inner concave annular groove is provided on both sides of the outer convex retaining ring, and a fixing clamp is installed in each inner concave annular groove. A fixing plate is installed at the end opening by bolts, and an automatic control structure for switching the liquid on and off according to pressure changes is installed in the channel opening;

[0022] The lower joint includes a lower transfer joint and a lower fixed clamp with external threads formed by two half rings. The end of the lower transfer joint that is plugged into the base is provided with a lower concave annular groove. The lower fixed clamp is installed in the lower concave annular groove and is threadedly connected to the base. The end of the lower transfer joint away from the base protrudes outward to form a sleeve. The internal structure of the lower transfer joint is consistent with the internal structure of the upper transfer joint.

[0023] The present invention can simultaneously install four sampling barrels on a base, and can control each sampling barrel to work independently, so that four samples can be taken in one trip down the well, greatly improving the sampling efficiency when going down the well in one trip. In addition, the four sampling barrels are installed in a surround manner, which reduces the length of the entire sampling short section and makes it more convenient to connect the entire sampling short section with other measuring short sections. Moreover, through various internal pipelines, it can provide corresponding oil circuits and lines for other connected measuring short sections while being used by itself. By setting up each control valve separately and in a distributed manner, not only can the internal pipeline design be simplified, but the corresponding sampling barrels can also be controlled one-to-one, which not only reduces the difficulty of production, but also reduces the mutual influence in the event of a fault; through the master control valve, all control valves can be uniformly controlled when needed, reducing the design difficulty of a single control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the multi-barrel sampling pup joint of the utility model;

[0025] Figure 2 It is a left side view of the upper joint in one embodiment of the present utility model;

[0026] Figure 3 This is a schematic structural diagram of a sampling unit and a control unit in one embodiment of the present invention;

[0027] Figure 4 is a radial cross-sectional view of a sampling portion in one embodiment of the present invention;

[0028] Figure 5 This is a schematic structural diagram of a sampling barrel in one embodiment of the present invention;

[0029] Figure 6 This is a schematic structural diagram of a detachable valve seat in one embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the valve seat groove structure on the base in one embodiment of the present utility model;

[0031] Figure 8 yes Figure 2 Middle AA section view;

[0032] Figure 9It is an axial cross-sectional view of the lower joint in one embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following describes the structure and operation of this solution through specific implementations and accompanying drawings. The "left end" and "right end" refer to the positions corresponding to the left and right sides of the image when facing the screen. The "front end" refers to the end where the multi-barrel sampling pup is inserted into the upper connector of the other measurement pup, and the "rear end" refers to the end where the multi-barrel sampling pup is inserted into the lower connector of the other measurement pup. In the following embodiments, due to the three-dimensional distribution of the channels within the substrate, a single diagram is not sufficient for comprehensive description. Therefore, specific channel diagrams are not provided. Please refer to the following text for the specific channel locations.

[0034] like Figure 1 As shown, this embodiment discloses an independently controlled multi-barrel sampling sub, comprising an upper joint 8, a sampling unit 1, a control unit 2, and a lower joint 9 connected in sequence. The multi-barrel sampling sub in this embodiment exists as an independent measurement sub, and can perform fixed-point sampling at the corresponding formation depth according to pre-set instructions or real-time instructions received from the well control console. Four sampling points can be achieved during one trip down the well. The specific structure is described as follows, wherein:

[0035] The upper joint 8 and the lower joint 9 are connected together through the base 3. The unconnected ends of the upper joint 8 and the lower joint 9 are used to connect other measuring short sections to realize the hydraulic oil transmission, cable signal transmission, etc. between the multi-barrel sampling short section and other measuring short sections, or receive the well signal. Therefore, if Figure 2 As shown, a hydraulic oil channel 31, a sample channel 32 and a cable channel 33 are provided in the upper joint 8, the base 3 and the lower joint 9. The hydraulic oil channel 31 includes a hydraulic oil high-pressure channel 311 for outputting high-pressure hydraulic oil and a hydraulic oil return channel 312 for recovering normal-pressure hydraulic oil. The specific structure will be described in subsequent embodiments.

[0036] like Figure 3 、 4 As shown, the sampling part 1 and the control part 2 are respectively installed on the base 3. Specifically, the sampling part 1 includes four cylindrical detachable sampling barrels 5. The surface of one end of the base 3 close to the upper joint 8 is symmetrically opened with four axially extending barrel grooves 34 around the axis. Each sampling barrel 5 is respectively installed in a barrel groove 34, and each sampling barrel 5 is a detachable structure.

[0037] The control unit 2 includes four control valves 21, each controlling one of the four sampling barrels 5, and a master control valve 22. The four control valves 21 control the four sampling barrels 5 through sample channels 32 within the base 3. The master control valve 22 controls the operation of each control valve 21 through a hydraulic oil channel 31, a cable channel 33, and a sample channel 32. The four control valves 21 and the master control valve 22 are installed in valve holes 4 axially arranged at one end of the base 3 near the lower connector 9. The valve holes 4 are grooves cut directly into the outer surface of the base 1 perpendicular to the axis. The specific number of valve holes 4 is determined by the requirements of the control unit 2.

[0038] When this solution is working, the four sampling barrels 5 are respectively installed in a barrel groove 34 on the base 3, and are connected to other measuring short sections by using the upper joint 8 and the lower joint 9, or directly connected to the well control equipment before going down the well for sampling. After reaching the set sampling depth, the main control valve 22 controls a certain control valve 21 to open the corresponding sampling barrel 5 for sampling. After completing the sampling at the current position, the sampling barrel 5 is closed and continues to go down. After reaching the next sampling point, the main control valve 22 controls another control valve 21 to open the corresponding sampling barrel 5 for sampling. The above actions are repeated until the sampling work of the four sampling barrels 5 is completed and they can be lifted to the well for sampling and analysis.

[0039] In this embodiment, each control valve 21 adopts a solenoid valve, and the master control valve 22 sends a control signal to each control valve 21 through a cable to control the on-off of the hydraulic oil channel connected to each control valve 21, thereby realizing the switching of each control valve 21. The master control valve 22 can control the four control valves 21 to work separately, or it can control the four control valves 21 to close at the same time when necessary; the structure of the sampling barrel 5 can adopt the existing sampling barrel structure, or it can adopt the sampling barrel structure in the following embodiment.

[0040] This embodiment can simultaneously install four sampling barrels 5 on a base, and can control each sampling barrel 5 to work independently, so that four samples can be taken in one trip down the well, which greatly improves the sampling efficiency when going down the well in one trip. In addition, the four sampling barrels 5 are installed in a surround manner, which reduces the length of the entire sampling short section and makes it more convenient to connect the entire sampling short section with other measuring short sections. Moreover, through various internal pipelines, it can provide corresponding oil circuits and lines for other connected measuring short sections while being used by itself. By setting up each control valve 21 separately and in a distributed manner, not only can the internal pipeline design be simplified, but the corresponding sampling barrel 5 can also be controlled one-to-one, which not only reduces the difficulty of production, but also reduces the mutual influence in the event of a failure. Through the master control valve 22, all control valves 21 can be uniformly controlled when needed, reducing the design difficulty of a single control valve 21.

[0041] Furthermore, in order to facilitate installation and removal of the sampling barrels 5, each sampling barrel 5 is installed independently, such as Figure 5 As shown, taking one of the sampling barrels as an example: a hollow locking ring 51 is installed at one end of the sampling barrel 5 close to the upper joint 7, and the locking ring 51 is screwed into the sampling barrel 5 through the thread on the outer surface. The interior of the locking ring 51 is hollow, and a connecting pipe 511 with a mud channel 512 is installed, and a pressure pin 513 is installed in the connecting pipe 511; the end of the locking ring 51 close to the upper joint 8 protrudes from the left end (front end) of the sampling barrel 5, and an inwardly concave arc groove 341 and a detachable semi-annular locking buckle 342 are provided at the position opposite to the barrel groove 34 and the protruding end of the locking ring 51; when installing, first insert the protruding end of the locking ring 51 into the inwardly concave arc groove 341, then buckle the semi-annular locking buckle 342, and then fix the locking ring 51 in the barrel groove 34 by a bolt passing through the semi-annular locking buckle 342.

[0042] A sample valve seat 52 connected to the sample channel 32 is installed at one end of the sampling barrel 5 close to the lower joint 9, and a mud piston 53 and a sample piston 54 are installed inside the sampling barrel 5, wherein a mud cavity 55 is formed between the mud piston 53 and the lock ring 51, a nitrogen cavity 56 is formed between the mud piston 54 and the sample piston 53, and a sample cavity 57 is formed between the sample piston 53 and the sample valve seat 52.

[0043] One end of the sample valve seat 52 is screwed into the right end (rear end) of the sampling barrel 5 through an external thread, and the other end protrudes from the sampling barrel 5. A valve seat channel 521 is provided inside the sample valve seat 52 for the collected sample to enter the sampling barrel 5. A hydraulic isolation valve 58 for controlling the on and off of the valve seat channel 521 is installed on the protruding end of the sample valve seat 52. The protruding end of the sample valve seat 52 faces the barrel groove 34 with an axial plane 522. A protruding platform 343 is provided on the barrel groove 34 at a position opposite to the axial plane 522. A sample channel outlet 344 communicating with the sample channel 32 in the base 3 is provided on the protruding platform 343, and a valve seat channel inlet 523 communicating with the valve seat channel 521 is provided on the axial plane 522. After the sample valve seat 52 is fitted with the protruding platform 343 through the axial plane 52, the valve seat channel inlet 523 and the sample channel outlet 344 are communicated, and then the sample valve seat 52 is fixed in the barrel groove 34 by means of bolts passing through the sample valve seat 52.

[0044] To improve the connection effect of the two interfaces, a sealing connecting pipe 524 can be installed at the valve seat channel inlet 523 or the sample channel outlet 344. The sealing connecting pipe 524 can form a sealed connection at the contact point between the valve seat channel inlet 523 and the sample channel outlet 344 to prevent liquid leakage.

[0045] The working mode of the sampling barrel 5 is as follows: when the multi-barrel sampling sub is lowered into the well, the mud in the well gradually enters the mud chamber 55 through the connecting pipe 511 in the locking ring 51. As the depth increases, the mud pressure in the mud chamber 55 will push the mud piston 53 to the right, thereby squeezing the nitrogen in the nitrogen chamber 56 for compression. The compressed nitrogen then pushes the sample piston 54 to the right until the sample piston 54 reaches the sample valve seat 52 at the right end and completely closes the entrance of the valve seat channel 521. This can prevent the air inside the sample chamber 57 from causing the internal and external pressures to become unbalanced, thereby preventing the sampling barrel 5 from deforming.

[0046] During the aforementioned process, the hydraulic isolation valve 58 on the sample valve seat 52 keeps closing the valve seat passage 521 under the pressure of the high-pressure hydraulic oil.

[0047] During sampling, the main control valve 22 opens the sample pipe 32 connected to the sampling barrel 5 in the base 3 and the hydraulically controlled isolation valve 58 on its sample valve seat 52 through the control valve 21 corresponding to the sampling barrel 5, and injects high pressure to allow the sample to enter the sample chamber 57 through the valve seat channel 521 under high pressure. The pressure is greater than the mud pressure in the mud chamber 55, so it will gradually push the sample piston 54 to move to the left end. The sample piston 54 squeezes the nitrogen chamber 56, compresses the nitrogen and then squeezes the mud piston 53, so that the mud in the mud chamber 55 is discharged from the sampling barrel through the connecting pipe 511 in the locking ring 51 until the mud piston 53 hits the locking ring 51 and closes the connecting pipe 511. When the sample pressure threshold in the sample chamber 57 or the nitrogen pressure threshold in the nitrogen chamber 56 reaches the preset condition, the sample collection is ended, and the hydraulically controlled isolation valve 58 and the control valve 21 connected thereto are closed to complete the collection of the sampling barrel 5.

[0048] When arriving at the next sampling point, repeat the above steps until the four sampling barrels 5 have completed sampling or achieved the sampling purpose. Then lift the multi-barrel sampling sub to the surface of the well and remove each sampling barrel 5 to complete the sampling. If more sampling is required, go down the well again for sampling according to the above instructions.

[0049] During the aforementioned sampling process, the master control valve 22 can uniformly close each control valve 21 after all four control valves 21 have completed sampling (ie, close the output of the sample pipeline to each control valve).

[0050] To facilitate monitoring of pressure changes within the sampling barrel 5, a gas check valve 531 and a pressure gauge can be installed on the mud piston 53 to inject nitrogen into the nitrogen chamber 56. A gas sealing plug 532 is installed at the inlet of the gas check valve 531 to prevent mud in the mud chamber 55 from entering the nitrogen chamber 56. The pressure value within the nitrogen chamber 56 can be used to obtain the current formation pressure and determine whether the sampling point (predetermined depth) has been reached. The pressure required for sample input is then controlled based on the pressure value at that point to ensure that the sample can fully enter the sampling chamber 57.

[0051] like Figure 3 、 6 As shown in Figures 7 and 7, in one embodiment of the present invention, to facilitate the manufacture and installation of each control valve 21, an axial valve seat groove 35 is provided at the position where the control valve 21 and the master control valve 22 are installed on the base 3. The valve seat groove 35 is eccentrically arranged, and the base 3 serving as the bottom has a certain thickness to facilitate the internal arrangement of the hydraulic oil channel 31, the sample channel 32, and the cable channel 33. A removable valve seat 36 is installed in the valve seat groove 35, and the valve hole 4 is provided on the removable valve seat 36. The hydraulic oil channel 31, the cable channel 33, and the sample channel 32 in the base 3 are respectively connected to the valve hole 4 through an internal branch pipe. A sealing plug 37 inserted from the surface of the removable valve seat 36 is installed on each branch pipe. The sealing plug 37 is used to control the hydraulic oil entry and pressure detection of each control valve 21, including opening the hydraulic oil pipeline sealing plug and the sampling barrel pressure detection sealing plug.

[0052] In this embodiment, all control valves 21 are installed on the removable valve seat 36, which makes it more convenient to make each valve hole 4 and the internal branch pipe. In addition, the removable valve seat 36 can be removed separately for installation and maintenance during maintenance. The removable valve seat 36 is fixed to the base 3 by bolts. In addition, the outer surface of the removable valve seat 36 is also consistent with the arc shape of the outer surface of the base 3, so that the removable valve seat 36 forms a cylindrical whole with the base 3 after installation, which will not affect the normal up and down well of the entire multi-barrel sampling short section.

[0053] To ensure a more stable installation of the removable valve seat 36 with the base 3, the bottom of the valve seat groove 35 is provided with a concave limiting groove 351 corresponding to the position of each valve hole 4. A protrusion 361 is also provided at the bottom of the removable valve seat 36, corresponding to each concave limiting groove 351. The protrusion 361 facilitates the installation of the removable valve seat 36 within the valve seat groove 35 of the base 3, improving stability. The structure of the protrusion 361 and the concave limiting groove 351 also facilitates the arrangement of the outlets of various internal pipelines.

[0054] Furthermore, to facilitate the arrangement of the control valves 21, in another embodiment (not shown), two valve seat grooves 35 can be provided and arranged sequentially on the base 3. A removable valve seat 36 is installed in each valve seat groove 35, and each removable valve seat 36 is fixed to the corresponding valve seat groove 35 by bolts. This structure can further reduce the volume of the removable valve seat 36, thereby facilitating the arrangement and installation of the control valves 21. The distributed design also minimizes disassembly work during maintenance.

[0055] like Figure 6As shown, in the aforementioned embodiment, to facilitate the wiring arrangement of the master control valve 22, the master control valve 22 is installed in three valve holes 4, one of which is installed with a circuit module 221, and the other two are installed with a normally closed module 222, 223, respectively. The circuit module 221 is connected to the cable in the cable channel 33 in the base 3 through a multi-core socket. The circuit module 221 is used to issue control instructions for each control valve 21 and also receive control instructions from the well. The circuit module 221 controls the two normally closed modules 222, 223 through cables. The two normally closed modules 222, 223 are respectively connected to the hydraulic oil channel 31 and the sample channel 32, and are used to control the hydraulic oil delivery of each control valve 21 and the opening and closing of the sample channel 32; each normally closed module 222, 223 is respectively installed with 2 to 3 normally closed solenoid valves 224, which are inserted into the groove provided in the valve hole 4 and then fixed in the valve hole 4 by a pressure plate 225 at the opening of the valve hole 4. The four control valves 21 each include a hydraulically controlled on / off valve 211, 212, 213, and 214, a hydraulic seal 23 for controlling the hydraulic input to the hydraulic channel of the hydraulically controlled on / off valve, and a detection seal 24 for detecting the pressure within the sampling barrel. To prevent mud from entering the valve openings 4, a sealing valve cap 226 is installed at the opening of each valve opening 4.

[0056] like Figure 6 As shown, the four sampling barrels are numbered 1, 2, 3, and 4, and the corresponding control valves are 211, 212, 213, and 214, respectively. Next to the control valve 211, there are respectively provided an oil pressure sealing plug 231 for opening the hydraulic oil channel and a fluid pressure detection sealing plug 241 for sampling barrel No. 1;

[0057] Next to the control valve 212, there are provided an oil pressure sealing plug 232 for opening the hydraulic oil channel and a sealing plug 242 for detecting the fluid pressure of the No. 2 sampling barrel.

[0058] Next to the control valve 213 are provided an oil pressure sealing plug 233 for opening the hydraulic oil channel and a sealing plug 243 for detecting fluid pressure of the No. 3 sampling barrel;

[0059] Next to the control valve 214 are provided an oil pressure sealing plug 234 for opening the hydraulic oil in the channel and a No. 4 sampling barrel fluid pressure detection sealing plug 244.

[0060] like Figure 7 As shown, the bottom of the removable valve seat 36 is provided with an inlet connected to the outlet of each channel in the valve seat groove 35, including the inlet of the hydraulic oil high-pressure channel 311, the inlet of the hydraulic oil return channel 312, the output socket of the cable channel 33, the sample outlet sealing hole 321 of sampling barrel No. 1, the sample outlet sealing hole 322 of sampling barrel No. 2, the sample outlet sealing hole 323 of sampling barrel No. 3, and the sample outlet sealing hole 324 of sampling barrel No. 4.

[0061] like Figure 4As shown, in one embodiment of the present invention, the cable channel 33 where the sampling barrel 5 is installed is arranged on the axis of the base 3, the hydraulic oil channel 31 and the sample channel 32 are arranged in the side walls between adjacent barrel grooves 34, and the cable channel 33, hydraulic oil channel 31 and sample channel 32 where the removable valve seat 36 is installed are arranged in the base 3. This arrangement can increase the wall thickness of each channel and improve the pressure resistance of the multi-barrel sampling pup joint in the well.

[0062] In one embodiment of the present invention, the upper joint 8 and the lower joint 9 are used to connect with other measuring short sections, which include the connection of the base 3 and the mutual connection of various channels inside the base 3, including the hydraulic oil channel 31, the sample channel 32 and the cable channel 33.

[0063] As shown in the figure, specifically, the upper joint 8 includes an upper transfer joint 81 and two fixed clamps 82 with external threads, each fixed clamp 82 is spliced by two half rings, and four channels are axially arranged inside the upper transfer joint 81, namely the hydraulic oil high-pressure channel 311, the hydraulic oil return channel 312, the sample channel 32 and the cable channel 33; the outer surface of the upper transfer joint 81 is provided with an outer convex retaining ring 811 with the same diameter as the base 3, and the upper transfer joint 81 is bounded by the outer convex retaining ring 811, the left side is the connecting end, and the right side is the plug-in end, and an inner concave annular groove 812 is provided on both sides of the outer convex retaining ring 811, and a fixing clamp 82 is installed in each inner concave annular groove 812. After the fixing clamp 82 is installed, the diameter of the connecting end and the plug-in end is smaller than the diameter of the outer convex retaining ring 812, and the upper transfer joint 81 is screwed into the open end of the base 3 through the fixing clamp 82 at the plug-in end (close to the base side) to form a threaded connection.

[0064] The connecting end of the upper transfer joint 81 (the end away from the base) is used to be inserted into the port of the measuring short section to be connected. For the convenience of positioning, two positioning grooves 813 are symmetrically arranged on the outer circumference of the connecting end. The hydraulic oil high-pressure channel 311, hydraulic oil return channel 312, sample channel 32 and cable channel 33 inside the upper transfer joint 81 are respectively connected to the corresponding channels in the base 3. An automatic control structure 6 that switches the liquid on and off according to pressure changes is installed in the openings of the hydraulic oil high-pressure channel 311, hydraulic oil return channel 312 and sample channel 32, and a multi-core male socket 7 is installed in the opening of the cable channel 33. The installed automatic control structure 6 is fixed at the opening by a fixing plate 814.

[0065] The specific automatic control structure 6 includes a hollow mounting tube 61 inserted into each channel opening, a sliding sleeve 62 and a locking ring 63 respectively located at both ends of the opening of the mounting tube 61, a guide rod 64 positioned in the mounting tube 61 by the sliding sleeve 62 and the locking ring 63, a spring 65 is sleeved on the outer surface of the guide rod 64 to push the sliding sleeve 62 against the channel opening, the interior of the guide rod 64 is hollow, and guide holes 641 and 642 communicating with the interior of the mounting tube 61 are provided in the middle and outer ends of the rod body, and the locking ring 63 is screwed into the mounting tube 61 by a thread. In the inner port of the mounting tube 61, the inserted end of the guide rod 64 is blocked by the lock ring 63, so that the guide rod 64 cannot slide out from the outer port of the mounting tube 61. The sliding sleeve 62 is located at the outer port of the mounting tube 61. The inner and outer surfaces of the sliding sleeve 62 are in sealing contact with the inner surface of the mounting tube 61 and the outer surface of the guide rod 64 at the same time. The guide hole 642 at the outer end of the guide rod 64 is blocked by the sliding sleeve 62. Under the pressure of the spring 65, the sliding sleeve 62 can prevent the internal liquid from flowing out of the channel from the mounting tube 61 or the guide rod 64.

[0066] To facilitate the fixation of each locking structure 6, two arc-shaped positioning blocks 611 protruding outward from the circumference are provided at the end of each mounting tube 61 that contacts the fixing plate 814. Limiting holes 816 corresponding to the ends of each mounting tube 61 and circular holes 815 corresponding to the multi-core male socket 7 are provided on the fixing plate 813. The fixing plate 813 is fixed to the opening of the connecting end by bolts, and the limiting holes 814 of the fixing plate 813 are respectively clamped on the corresponding pipe openings of the mounting tube 61.

[0067] In this embodiment, the internal structure of the lower connector 9 is identical to the internal structural base of the upper connector 8, except that the lower connector 9 is the end to be inserted. Therefore, the connection structure needs to correspond to the plug-in structure of the upper connector 8. Specifically, the lower connector 9 includes a lower transfer connector 91 and a lower fixing clamp 92. The lower fixing clamp 92 is composed of two half rings and has an external thread on the outer surface. One end of the lower transfer connector 91 is a plug-in end for plugging into the base 3. A lower concave limiting groove 93 for installing the lower fixing clamp 92 is provided on the outer surface of the plug-in end. The other end of the lower transfer connector 91 is a connecting end for connecting to other measuring short sections. The diameter from the middle outer surface to the connecting end is consistent with the diameter of the base 3. The end of the connecting end is a hollow sleeve 94 for plugging into the connecting end. A positioning key 95 corresponding to the two positioning grooves 813 on the upper transfer connector 81 is provided in the sleeve 94. The female multi-core female socket 71 is installed in the cable channel 33. This structure enables the connection end and the plug end to form a butt joint, thereby connecting with the adjacent measuring short section and achieving communication of the internal channel.

[0068] Taking the connecting end as an example, the working process of the automatic control structure in this embodiment is as follows: when the plug-in end is connected to the connecting end, the sliding sleeve 62 of the plug-in end and the sliding sleeve 62 in the connecting end contact and squeeze each other, while pushing their respective springs 65 to retract, thereby exposing the guide holes 642 at the ends of the guide rods 64 of both. Then, the channel filled with hydraulic oil or sample can pass through the guide hole 641 in the middle, and then be injected into the other party's mounting tube 61 through the guide hole 642 at the end.

[0069] When the plug-in end is connected to the connecting end, the multi-core female socket 71 on the plug-in end will be plugged into the multi-core male plug 7 on the connecting end to achieve a cable connection between them.

[0070] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention can be directly determined or deduced from the contents disclosed herein without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. An independently controlled multi-barrel sampling sub, characterized in that: It comprises an upper joint (8), a sampling part (1), a control part (2) and a lower joint (9) which are connected in sequence, wherein: The sampling part (1) and the control part (2) are mounted on the base (3), the upper joint (8) and the lower joint (9) are mounted at both ends of the base (3), respectively, the unconnected ends of the upper joint (8) and the lower joint (9) are used to connect to other short sections, and a hydraulic oil channel (31), a sample channel (32) and a cable channel (33) that are interconnected are provided in the upper joint (8), the base (3) and the lower joint (9); The sampling portion (1) includes four columnar detachable sampling barrels (5). The surface of one end of the base body (3) close to the upper joint (8) is symmetrically provided with four axially extending barrel grooves (34) around the axis, and each sampling barrel (5) is respectively installed in a barrel groove (34); The control unit (2) includes four control valves (21) for respectively controlling the four sampling barrels (5) and a master control valve (22). The four control valves (21) respectively control the four sampling barrels (5) through the sample channels (32) in the base (3). The master control valve (22) controls the operation of each control valve (21) through the hydraulic oil channel (31), the sample channel (32) and the cable channel (33). The four control valves (21) and the master control valve (22) are installed in valve holes (4) arranged along the axial direction at one end of the base (3) near the lower joint (9).

2. The multi-barrel sampling sub according to claim 1, characterized in that: Each sampling barrel (5) is provided with a locking ring (51) with a mud channel at one end close to the upper joint (8), and a sample valve seat (52) connected to the sample channel (32) is provided at one end close to the lower joint (9), and a mud piston (53) and a sample piston (54) are provided inside, wherein a mud cavity (55) is formed between the mud piston (53) and the locking ring (51), a nitrogen cavity (56) is formed between the mud piston (53) and the sample piston (54), and a sample cavity (57) is formed between the sample piston (54) and the sample valve seat (52).

3. The multi-barrel sampling sub according to claim 2, characterized in that: A gas one-way valve (531) for injecting nitrogen into the nitrogen chamber (56) and a pressure detector are installed on the mud piston (53). A sealing gas sealing plug (532) is installed at the inlet end of the gas one-way valve (531).

4. The multi-barrel sampling sub according to claim 2, characterized in that: One end of the locking ring (51) close to the upper joint (8) protrudes from the front end of the sampling barrel (5); an inwardly concave arcuate groove (341) and a detachable semi-annular lock buckle (342) are provided at a position of the barrel groove (34) opposite to the protruding end of the locking ring (51); the protruding end of the locking ring (51) is inserted into the inwardly concave arcuate groove (341) and fixed in the barrel groove (34) by the semi-annular lock buckle (342).

5. The multi-barrel sampling sub according to claim 2, characterized in that: One end of the sample valve seat (52) is screwed into the sampling barrel (5) through a thread, and the other end protrudes from the sampling barrel (5). A valve seat channel (521) is provided inside the sample valve seat (52), and a hydraulic isolation valve (58) for controlling the on / off of the valve seat channel (521) is installed on the protruding end, and the side of the protruding end facing the barrel groove (34) is an axial plane (522). A protruding platform (343) is provided on the barrel groove (34) at a position opposite to the axial plane (522), a sample channel outlet (344) is provided on the protruding platform (343), and a valve seat channel inlet (523) connected to the valve seat channel (521) is provided on the axial plane (522). The sample valve seat (52) is fixed in the barrel groove (34) by bolts after being fitted with the protruding platform (343) through the axial plane (522).

6. The multi-barrel sampling sub according to claim 1, characterized in that: An axial valve seat groove (35) is provided at the position where the control valve (21) and the master control valve (22) are installed on the base (3), a detachable valve seat (36) is installed in the valve seat groove (35), and the valve hole (4) is arranged on the detachable valve seat (36). The hydraulic oil channel (31), the sample channel (32) and the cable channel (33) in the base (3) are respectively connected to each valve hole (4) through a branch pipe, and a sealing plug inserted from the surface of the detachable valve seat (36) is installed on each branch pipe. The sealing plug includes an oil pressure sealing plug (23) for controlling the opening of the hydraulic oil channel of each control valve (21) and a detection sealing plug (24) for detecting the pressure of each sampling barrel.

7. The multi-barrel sampling sub according to claim 6, characterized in that: There are two valve seat grooves (35), and each of them is equipped with a detachable valve seat (36), and each detachable valve seat (36) is fixed in the corresponding valve seat groove (35) by a bolt; An indented limiting groove (351) corresponding to the position of each valve hole (4) is provided at the bottom of the valve seat groove (35), and a protrusion (361) having a shape corresponding to the indented limiting groove (351) is provided at the bottom of the detachable valve seat (36) corresponding to each valve hole (4).

8. The multi-barrel sampling sub according to claim 6, characterized in that: The cable channel (33) at the location where the sampling barrel (5) is installed is arranged on the axis of the base (3), the hydraulic oil channel (31) and the sample channel (32) are arranged in the side walls between adjacent barrel grooves (34), and the hydraulic oil channel (31), the sample channel (32) and the cable channel (33) at the location where the detachable valve seat (36) is installed are arranged in the base (3).

9. The multi-barrel sampling sub according to claim 1, characterized in that: The master control valve (22) comprises a circuit module (221) and two normally closed modules (222, 223) respectively installed in the three valve holes (4), wherein the circuit module (221) is used to connect to the cable channel (33), and the two normally closed modules (222, 223) are used to communicate with the hydraulic oil channel (31) respectively, and the circuit module (221) controls the two normally closed modules (222, 223) via cables; Two to three normally closed solenoid valves (224) are installed in each normally closed module. The normally closed solenoid valves (224) are inserted into the grooves in the valve hole (4) and then fixed in the valve hole (4) via a pressing plate (225).

10. The multi-barrel sampling sub according to claim 1, characterized in that: The upper joint (8) includes an upper intermediate joint (81) and two fixing clamps (82) formed by two half rings. Four channels are axially arranged inside the upper intermediate joint (81). An outer convex retaining ring (811) having the same diameter as the base (3) is provided on the outer surface. An inner concave annular groove (813) is provided on both sides of the outer convex retaining ring (811). A fixing clamp (82) is installed in each inner concave annular groove (813). A fixing plate (814) is installed at the end opening by bolts. An automatic control structure (6) for switching on and off the liquid according to pressure changes is installed in the channel opening. The lower joint (9) comprises a lower intermediate joint (91) and a lower fixing clamp (92) with external threads formed by two half rings. One end of the lower intermediate joint (91) plugged into the base (3) is provided with a lower concave annular groove (93). The lower fixing clamp (92) is installed in the lower concave annular groove (93) and is screwed to the base (3). One end of the lower intermediate joint (91) away from the base (3) protrudes outward to form a sleeve (94). The internal structure of the lower intermediate joint (91) is consistent with the internal structure of the upper intermediate joint (81).

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