Multifunctional vertical pushing short section capable of achieving independent control

Abstract

The utility model discloses a multifunctional vertical pushing short section capable of being controlled independently, which comprises a control part, a cut-off part and a pushing part which are sequentially connected through transfer joints, the control part comprises a control base body, a plurality of energy storage holes and a valve groove are arranged on the control base body, and an energy storage device is arranged in each energy storage hole; the pushing part comprises a pushing base body, a pushing arm arranged around the pushing base body, and a sampling tube arranged on the pushing arm; the cut-off part comprises a cut-off base body, a pressure sensor which is arranged on the cut-off base body and is used for measuring the pressure change after the sampling pipe is in contact with the well wall, and a cut-off valve which is used for opening and closing the sample channel according to the measured data of the pressure sensor. According to the utility model, the functions of supporting, sampling, backup arm fault maintenance, sample collection and detection and the like can be realized, not only are the functions of the self short section expanded and the length of the short section reduced, but also corresponding other functional short sections needing to be connected can be reduced, and the underground measurement and sampling efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of underground exploration, in particular to a multifunctional independent vertical pushing short section which can independently control the extension and contraction of a pushing arm and can detect whether a sampling process is normal. Background Art

[0002] In the formation drilling industry, it is necessary to understand the underground geological conditions after drilling. By lowering different measuring instruments to different depths, the physical, chemical, electrical and other properties of rocks and liquid mixtures in different formations underground can be obtained.

[0003] While existing surveying instruments serve different purposes, they are essentially constructed by attaching the corresponding measuring instrument to a single sub. This sub is then connected to a pusher sub that supports it at the measurement location, and a power sub that provides hydraulic power. Ultimately, this creates a series of subs, each providing different functions, before measurement can be performed downhole. Multiple subs are used because the sub's inherent diameter is limited, making it impossible to fit multiple functional components on a single sub. Furthermore, internal oil and wiring must remain unobstructed. Consequently, each sub can only accommodate one or two functions, ultimately requiring several to be combined for operation.

[0004] Currently, the commonly used push-pull subs all use hydraulic oil to push the piston rod, and support the well wall by driving multiple outward-type push-pull arms, so that the measuring subs can hover at a predetermined depth. For example, in the solution with the publication number: CN 114233222A, a solution is disclosed in which six push-pull arms are pushed to extend and retract synchronously by driving hydraulic oil by a pump. Such outward-type push-pull arms are generally rectangular when unfolded, and each push-pull arm requires multiple supporting arms to cooperate to form a stable support point. Therefore, each push-pull arm needs to occupy a certain length. In addition, the straight-push structure of the piston rod and the oil cylinder setting make it impossible to reduce the length of the entire push-pull sub. Moreover, due to its own structure, this push-pull sub cannot be installed with other functional components, resulting in a single function.

[0005] In addition, the current sampling pup joints used for downhole sampling often absorb mud in the wellbore due to loose contact with the sample layer, resulting in inaccurate results for the final collected samples. The downhole sample collection process cannot be controlled, and ultimately the purpose can only be achieved by repeated downhole sampling multiple times, which greatly affects the sampling efficiency. Utility Model Content

[0006] The utility model provides a multifunctional independent vertical pushing short section which can independently control the extension and contraction of a pushing arm and can detect whether a sampling process is normal.

[0007] One purpose of the present invention is to reduce the length of the entire short section by utilizing the vertical pusher in the prior art, and at the same time install a corresponding control structure on the limited short section, so that the short section can have the pushing function and can also handle the pushing failure.

[0008] Another purpose is to be able to directly detect whether the sampling of the sampling device working with the pusher meets the sampling conditions underground, and to adjust the sampling process in real time according to the feedback results to ensure that the predetermined samples are obtained.

[0009] Specifically, the utility model discloses an independently controllable multifunctional vertical push-pull sub, comprising a control portion, a cut-off portion, and a push-pull portion sequentially connected by a transfer joint. The transfer joint realizes sealed communication between adjacent connecting parts. Specifically, the channels include a high-pressure channel, an oil return channel, a sample channel, and a cable channel, wherein:

[0010] The control portion includes a control base body, on which are provided a plurality of energy storage holes arranged in sequence and perpendicular to the axis, and a valve slot. An energy accumulator is installed in each energy storage hole. Each energy accumulator includes a sealing cover that closes the opening of the energy storage hole, a balancing piston that separates the energy storage hole into a normal pressure chamber and a high pressure chamber, and a disc spring assembly is installed in the normal pressure chamber. A detachable valve seat is installed in the valve slot and is connected to each channel through an internal branch pipe. A control valve connected to each branch pipe is installed on the detachable valve seat. The control valve drives the push arm of the push arm portion to extend and retract by controlling the on and off of each branch pipe. In the event of a push arm failure, the control valve controls the energy accumulator to automatically retract the push arm.

[0011] The pushing portion includes a pushing base, a pushing arm arranged around the pushing base, and a sampling tube provided on the pushing arm. The pushing arm is driven by hydraulic oil to perform vertical telescopic movement relative to the pushing base. The sampling tube is used to sample the formation after the pushing arm contacts the well wall.

[0012] The cut-off part includes a cut-off base, a pressure sensor installed on the cut-off base to measure the pressure change after the sampling tube contacts the well wall, and a cut-off valve to open and close the sample channel according to the measurement data of the pressure sensor.

[0013] In one embodiment of the present invention, the normal pressure chambers of each of the energy storage holes are connected in sequence, and the high pressure chambers of each of the energy storage holes are connected in sequence. The normal pressure chamber is connected to the oil return channel, and the high pressure chamber is connected to the high pressure channel. The opening direction of the energy storage hole and the opening direction of the valve slot are staggered with each other and are perpendicular to each other in the axial direction.

[0014] In one embodiment of the present invention, the control branch pipe inlet of each branch pipe in the detachable valve seat is arranged on a side opposite to the valve slot, and detection holes for respectively detecting the status of each branch pipe inside are provided on the outer surface of the detachable valve seat, and solid sealing plugs are respectively installed at the openings of the detection holes;

[0015] A control branch pipe outlet is provided at the bottom of the valve groove, which is connected to the high-pressure channel, return oil channel, sample channel and cable channel in the control matrix through branch pipes respectively. The positions of the control branch pipe outlet and the control branch pipe inlet correspond to each other, and an inner hole sealing plug is installed at the connection between the two.

[0016] In one embodiment of the present invention, the detection holes include a socket mounting hole for installing a cable leading out of the cable channel, a contraction detection hole for respectively detecting the pressure of the two contraction pipelines of the pushing arm, a high-pressure detection hole for detecting the hydraulic oil pressure in the high-pressure channel, an opening detection hole for respectively detecting the pressure of the two opening pipelines of the pushing arm, and an oil return detection hole for detecting the hydraulic oil pressure in the oil return channel;

[0017] The branch pipe outlet includes an opening outlet connected to the pushing arm opening pipeline, a contraction outlet connected to the pushing arm contraction pipeline, a high-pressure outlet connected to the high-pressure channel, an oil return outlet connected to the oil return channel, and a plug outlet connected to the cable in the cable channel;

[0018] An energy storage high-pressure outlet and an energy storage return oil outlet respectively connected to the high-pressure channel and the oil return channel are also provided on the valve groove. An energy storage high-pressure adapter groove and an energy storage return oil adapter groove corresponding to the energy storage high-pressure outlet and the energy storage return oil outlet are respectively opened on the bottom of the detachable valve seat. The energy storage high-pressure adapter groove and the energy storage return oil adapter groove are respectively connected to the high-pressure chamber and the normal-pressure chamber of the energy accumulator through internal branch pipes, and a high-pressure detection hole and an oil return detection hole are respectively provided on the branch pipes connecting the energy storage high-pressure adapter groove and the energy storage return oil adapter groove.

[0019] In one embodiment of the present invention, the axial ends of the detachable valve seat are recessed plug interfaces, and a plurality of channel output ports are provided on the recessed plug interfaces, each channel output port is respectively connected to a branch pipe in the detachable valve seat, and a solenoid valve and a pressure sensor are installed at the channel output ports, and the axial branch pipes located inside the detachable valve seat are connected to each other through a through hole that radially passes through the detachable valve seat;

[0020] An outlet limiting plate and a cylindrical fixing seat are installed in sequence in the concave plug interface. The outlet limiting plate is provided with a limiting hole corresponding to the solenoid valve. After insertion, the cylindrical fixing seat seals both ends of the detachable valve seat.

[0021] In one embodiment of the present invention, an upper convex platform is provided at the bottom of the valve groove, and each branch pipe outlet is provided on the upper convex platform. An inner concave platform corresponding to the upper convex platform is provided at the bottom of the detachable valve seat, and each branch pipe inlet is provided on the inner concave platform.

[0022] In one embodiment of the present invention, the cut-off base is provided with a mounting groove, in which the cut-off seat and the pressure seat are movably mounted;

[0023] A cut-off hole facing the mounting groove is formed at one end of the cut-off seat, and a mounting hole radially penetrating the cut-off base is formed at a position corresponding to the mounting groove and the cut-off hole. The cut-off valve is installed in the cut-off hole after passing through the mounting hole. The end of the cut-off seat close to the pressure seat is a plug-in end with an output channel opening.

[0024] The pressure seat includes a protective tube with one end closed, and a mounting bracket for mounting the pressure sensor. The mounting bracket is columnar, and an inner concave plate groove for mounting a circuit board of the pressure sensor is axially arranged on one side. A measuring through hole for mounting a detection tube of the pressure sensor is axially eccentrically arranged on the side of the inner concave plate groove. Openings for cables to pass through are arranged at both ends of the bottom of the inner concave plate groove. The end of the measuring through hole close to the cut-off seat is shorter than the length of the inner concave plate groove and the opening of the inner concave plate groove at this end is completely exposed. The installed pressure sensor is connected to the plug-in end, and the protective tube inserts the mounting bracket and seals the outer surface of the plug-in end through the open end.

[0025] In one embodiment of the present invention, the mounting groove is a rectangular groove, the cut-off seat is a cuboid corresponding to the rectangular groove, the outer surface is an arc surface corresponding to the outer surface of the cut-off base, the shape of the pressure seat is cylindrical, and a threaded hole connected to the plug-in end bolt is provided on the side wall of the inner concave plate groove close to the plug-in end.

[0026] In one embodiment of the present utility model, a radially protruding rectangular block is provided on the cut-off seat at a position corresponding to the cut-off hole, the cut-off hole is located in the rectangular block, the mounting hole on the cut-off base is a rectangular hole corresponding to the rectangular block, and after the cut-off seat is inserted into the mounting groove, the rectangular block extends into the rectangular hole.

[0027] In one embodiment of the present invention, a plurality of branch pipes are provided inside the cut-off seat, and the branch pipe inlet of each branch pipe is respectively provided on a side plugged into the mounting groove, and a detection hole is provided on the outer surface of the cut-off seat, which is respectively connected to each branch pipe. The specific detection holes include a socket connection hole for installing a cable connector, an outlet detection hole for detecting the outlet pressure of the cut-off valve, an inlet detection hole for detecting the inlet pressure of the cut-off valve, an oil return detection hole for detecting the pressure of the return oil channel, and a high-pressure detection hole for detecting the pressure of the high-pressure channel. The opening of each detection hole is sealed by a solid sealing plug;

[0028] A cut-off branch pipe outlet is provided at the bottom of the mounting groove, which is connected to the high-pressure channel, return oil channel, sample channel and cable channel inside the cut-off base through branch pipes respectively. The positions of the cut-off branch pipe outlet and the cut-off branch pipe inlet correspond to each other, and an inner hole sealing plug is installed at the connection between the two.

[0029] In this embodiment, the stop valve is set on the side close to the pushing part, so that the pressure sensor can receive the pressure change signal of the sampling tube at a close distance (within 0.3 meters), and the obtained pressure value is more accurate. The sample is collected only after it is determined that the sampling environment meets the conditions, thereby ensuring the purity of the obtained sample. The on-off control of the sample channel by the stop valve can prevent the mud in the wellbore from entering the sampling tube. The control part can prevent the pushing part from being unable to retract the pushing arm when an accident occurs underground, thereby affecting the normal up and down movement of the entire measuring short section in the well. The entire multifunctional vertical pushing short section itself can realize the functions of support, sampling, pushing arm fault maintenance and sample collection detection, which not only expands the function of the short section itself and reduces the length of the short section, but also reduces the corresponding other functional short sections that need to be connected, greatly improving the efficiency of underground measurement and sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the multifunctional vertical push-pull sub of the utility model;

[0031] Figure 2 It is a left side view of the transfer joint in one embodiment of the utility model;

[0032] Figure 3 This is a schematic diagram of the control structure of an embodiment of the present invention;

[0033] Figure 4 This is a schematic structural diagram of a cut-off portion of an embodiment of the present utility model;

[0034] Figure 5 This is a schematic diagram of the installation of a stop valve according to one embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of a detachable valve seat structure according to one embodiment of the present invention;

[0036] Figure 7 yes Figure 6 Schematic diagram of the bottom of the removable valve seat;

[0037] Figure 8 It is a left side view of a detachable valve seat in one embodiment of the present invention;

[0038] Figure 9 This is a schematic structural diagram of a mounting frame in one embodiment of the present invention;

[0039] Figure 10 It is a schematic diagram of the cut-off base structure of one embodiment of the utility model. DETAILED DESCRIPTION

[0040] The structure and working process of this solution are further described below through specific implementation methods and drawings.

[0041] In the following embodiments, the channels in the entire vertical pushing short section include four basic through-channels. The through-channel here does not refer to a straight through-channel, but rather to the internal channels of the connected components being connected so that each channel can be transported from one end of the vertical pushing short section to the other end. The specific channels are a high-pressure channel for outputting high-pressure hydraulic oil, a return oil channel for recovering hydraulic oil, a sample channel for transporting samples, and a cable channel for transporting cables. When the different components on the interconnected bases realize their own functions, they are connected to these four main channels through corresponding branch pipes respectively, and then these branch pipes are controlled on and off by control valves and stop valves, so as to realize independent control functions of each component. The branch pipes are formed by channels drilled radially and axially on each base. The external opening of each branch pipe on the base needs to be installed with a sealing plug to prevent external mud from entering the interior.

[0042] For ease of description, in the following embodiments, a branch pipe connected to a high-pressure channel can be regarded as a high-pressure channel, and a branch pipe connected to an oil return channel can be regarded as an oil return channel, and the same applies to the sample channel and the cable channel.

[0043] The arrangement and connection method of the above-mentioned branch pipes will not be described one by one in the following embodiments, and only the specific structure and installed components will be described.

[0044] In the following embodiments, unless otherwise specified, each component is fixed to its own base by bolts, and the bases are connected to each other by transfer joints, and a sealing structure is provided at the connection to prevent leakage of internal and external liquids.

[0045] In addition, the role of the transfer joint in this patent is to connect adjacent substrates and at the same time realize the interconnection of oil channels, cable channels or sample channels between adjacent substrates. The specific connection method is through the fixed clamps with external threads stuck on both ends of the transfer joint, and internally threaded connection with the adjacent substrates at both ends. An axially penetrating channel is provided inside the transfer joint, and the channel is used to connect the high-pressure channel, return oil channel, sample channel and cable channel on the adjacent substrates. The number or function of the channels can be increased or decreased according to the needs of the instrument.

[0046] In this solution, the structure of the transfer joint is not the purpose of the utility model, so the specific structure of the transfer joint can be found in the patent publication number: CN 210600599 U.

[0047] In this solution, the specific structure of the pushing portion is also not the purpose of this utility model. The function of the pushing portion is to achieve radial vertical expansion and contraction around the base body, and to directly push and support the well wall through three or four radially expanding and contracting pushing arms. At the same time, samples can also be collected through the sampling tube arranged at the electrode plate. For the specific structure, please refer to the solution in the patent publication number: CN112696188 A.

[0048] like Figure 1 As shown, this embodiment discloses a multifunctional vertical push-pull sub that can be independently controlled, specifically comprising: a control part 1, a cut-off part 2, and a push-pull part 3 connected in sequence through a transfer joint 4, and the connection method is: transfer joint 4-control part 1-transfer joint 4-cut-off part 2-transfer joint 4-pushing part 3-transfer joint 4, as shown Figure 2 As shown, each transfer joint 4 is provided with multiple channels. After being connected, the control part 1, the cut-off part 2 and the pushing part 3 are connected to each other through the high-pressure channel 5, the return oil channel 6, the sample channel 7 and the cable channel 8 to realize the transmission of hydraulic oil and cables, wherein:

[0049] like Figure 3 As shown, the control part 1 is used to control the operation of the entire multifunctional vertical pushing short section, which includes the extension and retraction of the pushing arm 31 and the sampling process of the cut-off part 2; specifically, it includes a control base 11, on which a plurality of energy storage holes 12 arranged in sequence and perpendicular to the axis are axially arranged, and an axial valve groove 13, each energy storage hole 12 is respectively installed with an energy accumulator 14, each energy accumulator 14 includes a sealing cover 15 with a sealing ring for closing the opening of the energy storage hole 12, a balancing piston 18 for isolating the interior of the energy storage hole 12 into a normal pressure chamber 16 and a high pressure chamber 17, and a disc spring group 19 is installed in the normal pressure chamber 16; the energy accumulator 14 is used to store high-pressure hydraulic oil in advance through the high-pressure channel 5, and when the pushing part 3 fails, the high-pressure hydraulic oil in the high-pressure chamber 17 is discharged to make the normal pressure chamber 16 absorb the hydraulic oil in the return oil channel 6, so that the pushing arm 31 automatically retracts.

[0050] A detachable valve seat 10 is installed in the valve groove, and a control valve 101 is installed on the detachable valve seat 10; the control valve 101 controls the telescopic action of the pushing arm 31 by controlling the on-off of the high-pressure channel 5 and the oil return channel 6.

[0051] The pushing portion 3 is used to support the multifunctional vertical pushing short section on the well wall for sampling, including a pushing base 31, a pushing arm 32 arranged around the pushing base 31, and a sampling tube 33 installed on the pushing arm 32. The pushing arm 32 performs vertical telescopic movement relative to the pushing base 31 under the push of hydraulic oil. When the pushing arm 32 contacts the well wall, the internal sampling tube 33 contacts the sampling layer at the well wall (for the specific structure and working method of the pushing arm 32 and the sampling tube 33, please refer to CN 112696188 A, which is not the content of the present utility model and will not be repeated).

[0052] like Figure 4 、 5 As shown, the cut-off part 2 is used to obtain the sampling pressure of the sampling tube 33 and determine whether the sampling process is normal based on the pressure feedback; it includes a cut-off base 21, and a pressure sensor 241 installed on the cut-off base 21 for measuring the pressure change after the sampling tube 33 contacts the well wall, and a cut-off valve 231 for opening and closing the sample channel 7.

[0053] The working process of this embodiment is described as follows: other matching short sections can be connected to the transfer joints at both ends of the multifunctional vertical push short section, and then lowered into the well together.

[0054] Before or after descending the wellbore, the high-pressure passage 5 connected to the control unit 1 is opened via control valve 101. The hydraulic oil in the normal-pressure chamber 16 is expelled by squeezing the balancing piston 18 and disc spring assembly 19. After the high-pressure chambers 17 of each accumulator 14 are filled with high-pressure hydraulic oil, the high-pressure passage 5 connected to the control unit 1 is closed. After reaching the predetermined position, the control valve 101 controls the high-pressure hydraulic oil in the high-pressure passage 5 to extend the supporting arm 32 of the supporting unit 3 and contact the wellbore wall, thereby supporting the entire multifunctional vertical measurement sub in the current position. At this point, sampling or measurement operations can begin.

[0055] When sampling is required, the stop valve 231 first disconnects the sample channel 7 connected to the sampling tube 33. Since the opening of the sampling tube 33 is located on the contact surface between the pushing arm 32 and the well wall, the pressure change at the contact position between the sampling tube 33 and the sample wall can be obtained through the pressure sensor 241. If the current contact between the sampling tube 7 and the sample wall meets the sampling pressure, the sample channel 7 is connected for sampling and sample transportation; if the current contact between the sampling tube 7 and the sample wall is not tightly sealed or the pressure does not meet the conditions, a signal is returned to the control valve 101 to re-control the extension and retraction of the pushing arm 32 or adjust the height of the entire measuring short section and then re-support it until the contact between the sampling tube 7 and the sample wall meets the sampling pressure, and then sampling begins.

[0056] After completing the sampling and other measurement work, the sample channel 7 is closed through the stop valve 231, the high-pressure channel 5 connected to the pushing arm 32 is closed through the control valve 101, and the return oil channel 6 is opened to allow the hydraulic oil of the pushing arm 32 to flow back to the oil cylinder through the return oil channel 6. The pushing arm 32 is retracted into the pushing base 31, and the multifunctional vertical pushing short section is lifted to the surface of the well to complete the sampling or measurement.

[0057] During the operation of the pushing arm 32, if the pushing arm 32 cannot retract due to power failure, line failure or part wear, the control valve 101 closes the high-pressure channel 5 connected to the pushing arm 32, opens the high-pressure channel 5 connected to the high-pressure chamber 17 of the accumulator 14, and discharges the internal high-pressure hydraulic oil back to the oil cylinder through the return oil channel 5; closes the return oil channel 6 between the pushing arm 32 and the oil cylinder, opens the return oil channel 6 connecting the pushing arm 32 and the normal pressure chamber 16, and allows the hydraulic oil of the pushing arm 32 to enter the normal pressure chamber 16 through the return oil channel 6, so that the pushing arm 32 can retract itself when the hydraulic power is lost, which is convenient for maintenance after being pulled out of the well.

[0058] In the present embodiment, the stop valve 231 is arranged on a side close to the pushing portion 3, so that the pressure sensor 241 can receive the pressure change signal of the sampling tube 33 at a close distance (within 0.3 meters), and the pressure value obtained is more accurate. The sample is collected only after it is determined that the sampling environment meets the conditions, thereby ensuring the purity of the obtained sample. The on-off control of the sample channel 7 by the stop valve 231 can prevent the mud in the wellbore from entering the sampling tube. The control unit 1 can prevent the pushing portion 3 from being unable to retract the pushing arm 32 when an accident occurs underground, thereby affecting the normal up and down movement of the entire measuring short section in the well. The entire multifunctional vertical pushing short section itself can realize the functions of support, sampling, pushing arm fault maintenance and sample collection detection, which not only expands the function of the short section itself and reduces the length of the short section, but also reduces the corresponding other functional short sections that need to be connected, thereby greatly improving the efficiency of underground measurement and sampling.

[0059] In this embodiment, the normal-pressure chambers of the sequentially arranged accumulators 14 are connected in sequence through independent internal branch pipes, and the high-pressure chambers 17 of the accumulators 14 are connected in sequence through independent internal branch pipes. The normal-pressure chamber 16 of the accumulator 14 located at the head is connected to the oil return channel 6 controlled by the control valve 101, and its high-pressure chamber 17 is connected to the high-pressure channel 5 controlled by the control valve 101.

[0060] When the control valve 101 opens the return oil channel 6 leading to the accumulator 14, the normal pressure chamber 16 in each accumulator 14 is filled with normal pressure hydraulic oil in turn; at this time, the high pressure channel 5 connected to the high pressure chamber 17 is connected to the oil cylinder for storing oil through the return oil channel 6, and the disc spring group 19 pushes the balance piston 18 under the action of elastic force to completely discharge the hydraulic oil in the high pressure chamber 17, and the discharged high pressure hydraulic oil flows back to the cylinder, and at the same time, the connection between the high pressure channel 5 and the pushing part 3 is disconnected.

[0061] When the control valve 101 opens the high-pressure channel 5 leading to the accumulator 14, the return oil channel 6 connecting the normal-pressure chamber 16 and the pushing portion 3 is closed, and the return oil channel 6 connecting to the oil cylinder is opened. The high-pressure hydraulic oil in the high-pressure chamber 17 squeezes the balancing piston 18, causing the hydraulic oil in the normal-pressure chamber 16 to reflux through the return oil channel 6 connecting to the oil cylinder. When each high-pressure chamber 17 is filled, the return oil channel 6 and the high-pressure channel 5 connecting to the accumulator 14 are closed respectively.

[0062] The energy accumulators 14 are connected in sequence through branch pipes, which can reduce the number of internal pipelines and facilitate the control valve 101 to control the hydraulic oil of the energy accumulator 14.

[0063] To improve the pressure resistance of the high-pressure channel 5, oil return channel 6, sample channel 7, and cable channel 8, the opening direction of the energy storage hole 12 on the control substrate 11 is set to be staggered with the opening direction of the valve slot 13, and the two are arranged perpendicular to each other in the axial direction. This staggered structure allows the thicker parts of the control substrate 11 to be located on the same side, making it easier to arrange the high-pressure channel 5, oil return channel 6, sample channel 7, and cable channel 8 that axially penetrate the entire control substrate 11 in the thicker position.

[0064] like Figure 6 As shown, in one embodiment of the present invention, in order to facilitate the understanding of changes in the internal channels of the control unit 1 and to promptly resolve existing problems, a plurality of detection holes 107 for detecting the status of each internal channel are provided on the removable valve seat 10. The removable valve seat 10 is connected to the high-pressure channel 5, the return oil channel 6, the sample channel 7 and the cable channel 8 in the control base 11 through internally provided branch pipes. Then, a solenoid valve 102 controlled by the control valve 101 is installed at each branch pipe to achieve the connection and control of its own internal oil circuit or line; the detection hole 107 leads from the outer surface of the removable valve seat 10 to the corresponding branch pipe, and a solid sealing plug 103 is installed at each opening; when on the well, the solid sealing plug 103 can be removed and various measuring instruments can be connected to detect the internal branch pipes and other connected measuring nipples, including whether the pressure in the branch pipe meets the downhole operation requirements and whether the hydraulic oil flows smoothly, thereby reducing the probability of failure of the equipment when working downhole.

[0065] To facilitate communication, the control branch pipe inlet 105 connecting each branch pipe with each channel is arranged on the side of the removable valve seat 10 facing the valve slot 13, and the control branch pipe outlet 132 corresponding to each branch pipe on the removable valve seat 10 is provided at the bottom of the valve slot 13. Each control branch pipe outlet 132 is connected to the corresponding high-pressure channel 5, return oil channel 6, sample channel 7 and cable channel 8 through an internal branch pipe. When the removable valve seat 10 is inserted into the valve slot 13, each control branch pipe inlet 105 on the removable valve seat 10 is connected to each control branch pipe outlet 132 in the valve slot 13, so that the high-pressure channel 5, return oil channel 6, sample channel 7 and cable channel 8 in the control base 11 are respectively bypassed to enter the removable valve seat 10, so that the control valve 101 on the removable valve seat 10 can control the on and off of each branch pipe connected to it.

[0066] like Figure 7 As shown, to prevent leakage at the connection between each control branch pipe inlet 105 on the removable valve seat 10 and each control branch pipe outlet 132 on the valve spool 13, an inner bore sealing plug 104 is installed at each control branch pipe inlet 105. The inner bore sealing plug 104 has a hollow channel inside and sealing rings on the outer surfaces of both ends. When the removable valve seat 10 and the valve spool 13 are connected, the ends of the inner bore sealing plug 104 are respectively inserted into the connected control branch pipe inlet 105 and control branch pipe outlet 132, thereby achieving a sealed connection while allowing the passage of internal hydraulic oil or cables. The inner bore sealing plug 104 is an independent component and can be installed at the control branch pipe outlet 132 or the control branch pipe inlet 105.

[0067] Specifically, the detection hole 107 on the removable valve seat 10 includes a socket mounting hole for installing the cable channel 8 to lead out the cable, two contraction detection holes for detecting the contraction pipeline pressure of the pushing arm 32 (including the return oil channel connected to the oil cylinder when the pushing arm is normally contracted, and the return oil channel connected to the energy accumulator when there is a fault), a high-pressure detection hole for detecting the hydraulic oil pressure in the high-pressure channel 5, two opening detection holes for detecting the opening pipeline pressure of the pushing arm 32 (including the high-pressure channel when the pushing arm is normally opened, and the high-pressure channel connected to the energy accumulator when there is a fault), and a return oil detection hole for detecting the hydraulic oil pressure in the return oil channel 6.

[0068] The control branch outlets 132 within the valve spool 13 include an open outlet connected to the expansion line of the leaning arm 32, a contraction outlet connected to the contraction line of the leaning arm 32, a high-pressure outlet connected to the high-pressure channel 5, an oil return outlet connected to the oil return channel 6, and a plug outlet connected to the cable in the cable channel 7. The removable valve seat 10 divides the flow from the various channels connected to the control base 11 through branch pipes, forming multiple channels between the accumulator 14 and the leaning portion 3, thereby achieving refined control. This branching through the removable valve seat 10 greatly reduces the difficulty of manufacturing the branches on the control base 11.

[0069] The valve spool 13 also includes an energy storage high-pressure outlet 171 and an energy storage return oil outlet 161, which communicate with the high-pressure channel 5 and the oil return channel 6, respectively. The bottom of the removable valve seat 10 includes an energy storage high-pressure inlet 172 and an energy storage return oil inlet 162, corresponding to the energy storage high-pressure outlet 171 and the energy storage return oil outlet 161, respectively. Branch pipes within the removable valve seat 10, connecting to the energy storage high-pressure inlet 172 and the energy storage return oil inlet 162, are connected to the high-pressure channel 5 and the oil return channel 6, respectively, which communicate with the accumulator 14. These two branch pipes are controlled by a solenoid valve controlled by the control valve 101. These two branch pipes are connected to the expansion detection hole and the contraction detection hole, respectively.

[0070] In this embodiment, the openings of each detection hole 107 on the side of the detachable valve seat 10 opposite to the valve groove 13 are the inlets of each control branch pipe. The detection hole 107 also serves to connect the internal branch pipes. When the opening on the outer surface is closed by the solid sealing plug 103, the branch pipe being detected and the detection hole 107 are connected inside the detachable valve seat 10. Through the setting of each detection hole 107, while serving as a transit connection for the branch pipes, it is also convenient to maintain and repair the multifunctional vertical pushing short section, ensuring the normal progress of underground work. At the same time, the use of the detection hole 107 can also reduce the various fault detection devices installed on the multifunctional vertical pushing short section, reduce the difficulty of making the entire multifunctional vertical pushing short section, simplify the arrangement of the internal branch pipes, and provide a basis for improving the functional integration of the multifunctional vertical pushing short section.

[0071] like Figure 8 As shown, in one embodiment of the present invention. In order to facilitate the arrangement of the branches in the removable valve seat 10, the axial ends of the removable valve seat 10 are set as recessed plug interfaces 111, and a plurality of channel output ports 113 are provided in the recessed plug interfaces 111. Each channel output port 113 is respectively connected to the branch pipe in the removable valve seat 10, and the axial branches inside the removable valve seat 10 are connected to each other through the through holes radially penetrating the removable valve seat 10. Such a structure can make the internal branch pipe form a turn, and the solenoid valve 102 can be used to install in the channel output port 113 to control the on and off of the branch pipe. The solenoid valve 102 includes a normally open solenoid valve and a normally closed solenoid valve.

[0072] To facilitate installation and sealing, an outlet limiting plate 108 and a cylindrical fixing seat 109 are installed in sequence in the recessed plug interface 111. The outlet limiting plate 108 is provided with limiting holes 112 corresponding to the solenoid valves 102 installed at the output ports 113 of each channel at the recessed plug interface 111. The outlet limiting plate 108 uses the limiting holes 112 to clamp each solenoid valve 102 and is fixed in the recessed plug interface 111 with bolts. Then, the cylindrical fixing seat 109 is inserted to seal the two ends of the detachable valve seat 10.

[0073] To improve the stability of the removable valve seat 10 after installation, a raised platform 131 is provided at the bottom of the valve spool 13. The control branch pipe outlets 132 communicating with each channel are located on the raised platform 131. A concave platform 106 corresponding to the raised platform 131 is provided at the bottom of the removable valve seat 10. The control branch pipe inlets 105 of each branch pipe (i.e., the bottom openings of the detection holes 107) are located on the concave platform 106. The raised platform 131 and the concave platform 106 have corresponding shapes and can be cylindrical, cubic, or irregular shapes that can be plugged into each other. This corresponding concave and convex structure also facilitates the layout of the internal branch pipes and ensures more precise docking of the two channels.

[0074] In one embodiment of the present invention, the cut-off portion 2 includes a cut-off base 21 with an axial mounting groove. An axial mounting groove 22 is provided on the cut-off base 21. A cut-off seat 23 and a pressure seat 24 are movably mounted in sequence in the mounting groove 22.

[0075] The end of the cut-off seat 23 close to the control part 1 is a sealing end 232, and the end close to the pressure seat 24 is a plug-in end 233 with an output channel opening. In order to facilitate the accommodation and installation of the cut-off valve 231, a cut-off hole 234 facing the mounting groove 22 is opened at the end of the cut-off seat 23 close to the pressure seat 24, and a mounting hole 221 radially penetrating the cut-off base 21 is opened at a position corresponding to the mounting groove 22 and the cut-off hole 234. The cut-off valve 231 is installed in the channel formed by the cut-off hole 234 and the mounting hole 221 through the mounting hole 221.

[0076] like Figure 9 As shown, the pressure seat 24 includes a protective tube 242 with one end closed, and a mounting bracket 243 movably mounted inside the protective tube 242 for mounting the pressure sensor 241. The mounting bracket 243 is cylindrical, and an inner concave plate groove 244 for mounting the circuit board of the pressure sensor 241 is axially arranged on one side. A measuring through hole 245 for mounting the detection tube of the pressure sensor 241 is eccentrically arranged on the side of the inner concave plate groove 244. Openings 246 for passing cables are provided at both ends of the bottom of the inner concave plate groove 244. The end of the measuring through hole 245 close to the cut-off portion 23 is shorter than the length of the inner concave plate groove 244 and the opening 246 at this end of the inner concave plate groove 244 is completely exposed. After installation, the pressure sensor 241 is connected to the plug end, and the open end of the protective tube 242 is sealed on the outer surface of the plug end 233.

[0077] Mounting bracket 243 is removably mounted, facilitating the placement of pressure sensor 241. This embodiment employs a quartz pressure sensor. The use of a protective tube 242 enhances the stability and sealing of movable bracket 243 while ensuring internal pressure stability. The recessed groove 244 and measurement hole 245 on movable bracket 243 reduce the impact of heat from the circuit board on the pressure sensor during operation. Furthermore, the open-ended position of movable bracket 243 within protective tube 242 maintains a consistent internal temperature.

[0078] To facilitate the control of the sample channel 7 by the shutoff seat 23, a high-pressure channel 5, an oil return channel 6, a sample channel 7, and a cable channel 8 consisting of branch pipes are provided inside the shutoff seat 23. Each branch pipe is controlled by a shutoff valve 231, and the inlet of each channel is connected to the outlet of the high-pressure channel 5, oil return channel 6, sample channel 7, and cable channel 8 inside the shutoff base 21. The outlet of each channel inside the shutoff base 21 is set at a position within the mounting groove 22 corresponding to the inlet of each channel on the shutoff seat 23. Similarly, an inner hole sealing plug 104 is installed at the interconnected outlet or inlet. The inlet position setting of each branch pipe on the shutoff seat 23 and the position setting of each channel outlet in the mounting groove 22 are the same as the installation method of the detachable valve seat 10 and valve slot 13 on the control base 11, and will not be repeated here.

[0079] The shutoff seat 23 is also provided with a plurality of radial through-holes 235, each connected to a different internal branch pipe. These radial through-holes 235 are used to install various testing equipment, including a socket connection hole for installing a cable connector, an outlet detection hole for testing the outlet of the shutoff valve 231, an inlet detection hole for testing the inlet of the shutoff valve 231, an oil return detection hole for detecting the pressure in the oil return channel 6, and a high-pressure detection hole for detecting the pressure in the high-pressure channel 5. Similarly, the radial through-holes 235 here function similarly to the detection holes 107 on the aforementioned removable valve seat 10: both are used to connect various measuring equipment when testing the internal passage of the multi-functional vertical push-pull sub on the wellbore. When not being tested, the external openings of each radial through-hole 235 are sealed with a solid sealing plug 103.

[0080] To facilitate installation and fixation, the mounting groove 22 on the cut-off base 21 is a rectangular groove, the cut-off seat 23 is a cuboid corresponding to the rectangular groove, and the outer surface is an arc surface corresponding to the outer surface of the cut-off base 21. The pressure seat 24 is cylindrical in shape, and a threaded hole 247 connected to the plug-in end 233 is provided on the side wall of the inner concave plate groove 244 near the plug-in end 233.

[0081] The sealing end 232 of the shutoff seat 23 shares the same structure as the recessed plug-in port 111 of the removable valve seat 10 in the aforementioned embodiment. Both are equipped with outlets for multiple branch pipes, each of which houses a solenoid valve 102 for controlling the flow of each branch pipe. Each solenoid valve 102 is secured by a fixing plate 238 with a limit hole, and the entire end is sealed with a sealing cap 239. The plug-in port 233 is used to output the branch pipes controlled by the shutoff valve 231. Each branch pipe forms an output port at the plug-in port 233. The mounting bracket 243 is secured to the plug-in port 233 by bolts passing through bolt holes 247 at the end. The circuitry and channels of the pressure sensor 241 are also connected to the output port on the plug-in port 233. After installation, the shutoff seat 23 and pressure seat 24 are connected to each other and then inserted into the mounting slot 22.

[0082] like Figure 10 As shown, in order to facilitate the fixing of the stop valve 231, a protruding rectangular block 222 is provided at the position of the stop seat 23 and the stop hole 234 thereon. The rectangular block 222 includes the stop hole 234, and the mounting hole 221 on the stop base 21 is set as a rectangular hole corresponding to the rectangular block; during installation, after the stop seat 23 is inserted into the mounting groove 22, the rectangular block 222 thereon is inserted into the rectangular hole in the mounting groove 22. After using the rectangular block 222, the channel for installing the stop valve 231 can be formed into a whole, thereby improving the sealing effect of the stop valve 231 and facilitating later maintenance.

[0083] The following is a brief description of the working process of the stop valve 231:

[0084] In this embodiment, the pushing arm 32 of the pushing portion 3 contacts the well wall through the electrode plate arranged at the top. Rubber rings are arranged around the surface where the electrode plate contacts the well wall, and the inside is the pipe mouth of the sampling tube 33. The height of the rubber ring is greater than the height of the entire contact surface. Therefore, when the electrode plate contacts the well wall, the rubber rings around it will form a sealed space at the contact point. At this time, if the sampling tube 33 works, it can directly absorb the sample contained in the formation at the well wall from the closed interval; on the contrary, if the seal is not tight, the mud in the wellbore will enter the sampling channel 7 when the sampling tube 33 absorbs, thereby contaminating the sample.

[0085] During actual operation, the stop valve 231 first disconnects the sample channel 7 connected to the sample tube, and collects the pressure value in the space formed by the current rubber ring. If the current pressure value is the same as the pressure value here in the well, it indicates that the rubber ring is not tightly sealed. At this time, if the sampling tube 33 works, the mud in the wellbore will be sucked in, resulting in sampling failure. A signal indicating that the sampling pressure does not meet the requirements is sent to the control valve 101. At this time, the control valve 101 will control the push arm 32 to re-extend and retract until the pressure measured by the stop valve 231 meets the conditions. During this process, the extension and retraction of the push arm 32 can be repeated at the current position, or the current position of the entire measuring device can be appropriately raised or lowered, and the telescopic support can be performed after repositioning.

[0086] If the space pressure formed by the rubber ring reaches the required condition, the shut-off valve 231 opens the sample channel 7 according to the pressure feedback and sends a signal to the control valve 101. The control valve 101 then controls the connected sample nipple to extract the formation sample through the sample channel 7 and the sample tube 33 until the sampling purpose is achieved.

[0087] The operation of the stop valve 231 needs to be judged according to the pressure of the high-pressure channel 5 and the oil return channel 6 to determine whether the current pushing arm 32 is working normally.

[0088] In one embodiment of the present invention, the outer ends of the transfer joints 4 located at both ends of the multifunctional vertical push-up short section can be used to connect an upper joint 5 at the upper end (the end close to the well) when not connected to other measuring short sections. The upper joint 5 is used to provide a hooking point for the downhole cable, including a hooking ring 51 and a sleeve 52 threaded with the transfer joint. The sleeve 52 can protect the channel in the transfer joint 4 from being infiltrated by external mud; similarly, the other end (the end close to the well) can be connected to other measuring short sections, and a sealing cover 6 that seals the outer end of the transfer joint can also be directly installed.

[0089] 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. A multifunctional vertical push-pull sub that can be controlled independently, characterized in that: It includes a control part, a cut-off part and a pushing part connected in sequence through a transfer joint. The transfer joint realizes the sealed communication of channels between adjacent connecting parts. The specific channels include a high-pressure channel, an oil return channel, a sample channel and a cable channel, wherein: The control portion includes a control base body, on which are provided a plurality of energy storage holes arranged in sequence and perpendicular to the axis, and a valve slot. An energy accumulator is installed in each energy storage hole. Each energy accumulator includes a sealing cover that closes the opening of the energy storage hole, a balancing piston that separates the energy storage hole into a normal pressure chamber and a high pressure chamber, and a disc spring assembly is installed in the normal pressure chamber. A detachable valve seat is installed in the valve slot and is connected to each channel through an internal branch pipe. A control valve connected to each branch pipe is installed on the detachable valve seat. The control valve drives the push arm of the push arm portion to extend and retract by controlling the on and off of each branch pipe. In the event of a push arm failure, the control valve controls the energy accumulator to automatically retract the push arm. The pushing portion includes a pushing base, a pushing arm arranged around the pushing base, and a sampling tube provided on the pushing arm. The pushing arm is driven by hydraulic oil to perform vertical telescopic movement relative to the pushing base. The sampling tube is used to sample the formation after the pushing arm contacts the well wall. The cut-off part includes a cut-off base, a pressure sensor installed on the cut-off base to measure the pressure change after the sampling tube contacts the well wall, and a cut-off valve to open and close the sample channel according to the measurement data of the pressure sensor.

2. The multifunctional vertical push-pull sub according to claim 1, characterized in that: The normal pressure chambers of each energy storage hole are connected in sequence, and the high pressure chambers of each energy storage hole are connected in sequence. The normal pressure chamber is connected to the oil return channel, and the high pressure chamber is connected to the high pressure channel. The opening direction of the energy storage hole and the opening direction of the valve slot are staggered and perpendicular to each other in the axial direction.

3. The multifunctional vertical push-pull sub according to claim 1, characterized in that: The control branch pipe inlet of each branch pipe in the detachable valve seat is arranged on a side opposite to the valve slot, and detection holes for respectively detecting the status of each branch pipe inside are provided on the outer surface of the detachable valve seat, and solid sealing plugs are respectively installed at the openings of the detection holes; A control branch pipe outlet is provided at the bottom of the valve groove, which is connected to the high-pressure channel, return oil channel, sample channel and cable channel in the control matrix through branch pipes respectively. The positions of the control branch pipe outlet and the control branch pipe inlet correspond to each other, and an inner hole sealing plug is installed at the connection between the two.

4. The multifunctional vertical push-pull sub according to claim 3 is characterized in that: The detection holes include a socket installation hole for installing a cable leading out of the cable channel, a contraction detection hole for respectively detecting the pressure of the two contraction pipelines of the pushing arm, a high-pressure detection hole for detecting the hydraulic oil pressure in the high-pressure channel, an opening detection hole for respectively detecting the pressure of the two opening pipelines of the pushing arm, and an oil return detection hole for detecting the hydraulic oil pressure in the oil return channel; The branch pipe outlet includes an opening outlet connected to the pushing arm opening pipeline, a contraction outlet connected to the pushing arm contraction pipeline, a high-pressure outlet connected to the high-pressure channel, an oil return outlet connected to the oil return channel, and a plug outlet connected to the cable in the cable channel; An energy storage high-pressure outlet and an energy storage return oil outlet respectively connected to the high-pressure channel and the oil return channel are also provided on the valve groove. An energy storage high-pressure adapter groove and an energy storage return oil adapter groove corresponding to the energy storage high-pressure outlet and the energy storage return oil outlet are respectively opened on the bottom of the detachable valve seat. The energy storage high-pressure adapter groove and the energy storage return oil adapter groove are respectively connected to the high-pressure chamber and the normal-pressure chamber of the energy accumulator through internal branch pipes, and a high-pressure detection hole and an oil return detection hole are respectively provided on the branch pipes connecting the energy storage high-pressure adapter groove and the energy storage return oil adapter groove.

5. The multifunctional vertical push-pull sub according to claim 3, characterized in that: The axial ends of the detachable valve seat are recessed plug interfaces, and a plurality of channel output ports are provided on the recessed plug interfaces. Each channel output port is respectively connected to a branch pipe in the detachable valve seat. A solenoid valves and pressure sensors are installed at the channel output ports. The axial branch pipes located inside the detachable valve seat are connected to each other via a through hole that radially passes through the detachable valve seat. An outlet limiting plate and a cylindrical fixing seat are installed in sequence in the concave plug interface. The outlet limiting plate is provided with a limiting hole corresponding to the solenoid valve. After insertion, the cylindrical fixing seat seals both ends of the detachable valve seat.

6. The multifunctional vertical push-pull sub according to claim 4, characterized in that: An upper convex platform is provided at the bottom of the valve slot, and each branch pipe outlet is provided on the upper convex platform. A concave platform corresponding to the upper convex platform is provided at the bottom of the detachable valve seat, and each branch pipe inlet is provided on the concave platform.

7. The multifunctional vertical push-pull sub according to claim 1, characterized in that: The cut-off base is provided with a mounting groove, in which a cut-off seat and a pressure seat are movably mounted; A cut-off hole facing the mounting groove is formed at one end of the cut-off seat, and a mounting hole radially penetrating the cut-off base is formed at a position corresponding to the mounting groove and the cut-off hole. The cut-off valve is installed in the cut-off hole after passing through the mounting hole. The end of the cut-off seat close to the pressure seat is a plug-in end with an output channel opening. The pressure seat includes a protective tube with one end closed, and a mounting bracket for mounting the pressure sensor. The mounting bracket is columnar, and an inner concave plate groove for mounting a circuit board of the pressure sensor is axially arranged on one side. A measuring through hole for mounting a detection tube of the pressure sensor is axially eccentrically arranged on the side of the inner concave plate groove. Openings for cables to pass through are arranged at both ends of the bottom of the inner concave plate groove. The end of the measuring through hole close to the cut-off seat is shorter than the length of the inner concave plate groove and the opening of the inner concave plate groove at this end is completely exposed. The installed pressure sensor is connected to the plug-in end, and the protective tube inserts the mounting bracket and seals the outer surface of the plug-in end through the open end.

8. The multifunctional vertical push-pull sub according to claim 7, characterized in that: The mounting groove is a rectangular groove, the cut-off seat is a cuboid corresponding to the rectangular groove, the outer surface is an arc surface corresponding to the outer surface of the cut-off base, the shape of the pressure seat is cylindrical, and a threaded hole connected to the plug-in end bolt is provided on the side wall of the inner concave plate groove close to the plug-in end.

9. The multifunctional vertical push-pull sub according to claim 7, characterized in that: A radially protruding rectangular block is provided on the cut-off seat at a position corresponding to the cut-off hole. The cut-off hole is located in the rectangular block. The mounting hole on the cut-off base is a rectangular hole corresponding to the rectangular block. After the cut-off seat is inserted into the mounting groove, the rectangular block extends into the rectangular hole.

10. The multifunctional vertical push-pull sub according to claim 7, characterized in that: A plurality of branch pipes are provided inside the stop seat, and the branch pipe inlet of each branch pipe is respectively provided on a side plugged into the mounting groove. A detection hole connected to each branch pipe is provided on the outer surface of the stop seat. The specific detection holes include a socket connection hole for installing a cable connector, an outlet detection hole for detecting the outlet pressure of the stop valve, an inlet detection hole for detecting the inlet pressure of the stop valve, an oil return detection hole for detecting the pressure of the return oil channel, and a high-pressure detection hole for detecting the pressure of the high-pressure channel. The opening of each detection hole is sealed by a solid sealing plug; A cut-off branch pipe outlet is provided at the bottom of the mounting groove, which is connected to the high-pressure channel, return oil channel, sample channel and cable channel inside the cut-off base through branch pipes respectively. The positions of the cut-off branch pipe outlet and the cut-off branch pipe inlet correspond to each other, and an inner hole sealing plug is installed at the connection between the two.

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