Capillary cable descending and recycling method and retractable anchor

Abstract

The invention discloses a capillary cable descending and recycling method and a retractable anchor, and relates to the technical field of mine operation equipment. The capillary cable descending and recycling method comprises the steps that S1, a gas production tree is replaced with an oil pipe blowout preventer, and an oil pipe is descended to the toe end of a horizontal shaft; s2, an anchor is installed at the far end of the capillary cable, and then the anchor is lowered into the vertical pipe section of the oil pipe; s3, a blowout prevention circulating device is installed at the top end of the oil pipe blowout preventer, and the pump skid is connected to an inlet of the blowout prevention circulating device; s4, starting a pump pry to inject the working fluid into the oil pipe so as to push the anchor to move in the length direction of the oil pipe until the anchor moves into the horizontal shaft from the far end of the oil pipe, and pulling the capillary cable into the toe end of the horizontal shaft through the anchor, the current situation that the capillary cable cannot be conveyed to the toe end of the horizontal shaft can be changed through the capillary cable descending and recycling method.

Description

Technical Field

[0001] The present application relates to the technical field of mine operation equipment, and more specifically, to a method for lowering and recovering a capillary cable. In addition, the present application also relates to a retractable anchor used in the above-mentioned method for lowering and recovering a capillary cable. Background Art

[0002] With the large-scale exploration and development of unconventional gas wells such as tight gas wells and shale gas wells, the number of domestic production gas wells has increased year by year. In order to detect changes in production gas wells and ensure exploration safety, conventionally, during the exploration of production gas wells, a working string such as a coiled tubing is often run into the production gas well. The working string is then removed and sent to professional instruments for short-term detection. However, during production practice, the applicant found that the existing production gas well detection methods have at least the following problems:

[0003] The horizontal wellbore of a production gas well has typically undergone 20 sections of perforation and fracturing with more than 100 clusters. The horizontal wellbore wall is decorated with numerous blastholes, creating a relatively unobstructed connection between the wellbore and the formation. When conventional pumping liquid propels tools forward in the horizontal wellbore, the pumped liquid flows from the blastholes into the formation, failing to provide sufficient thrust for the capillary cable. Consequently, the capillary cable cannot be delivered to the wellbore toe.

[0004] In summary, how to change the current situation where the capillary cable cannot be delivered to the toe of the horizontal wellbore is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present application is to provide a capillary cable running downhole and recovery method, which can change the current situation that the capillary cable cannot be delivered to the toe end of the horizontal wellbore.

[0006] Another object of the present application is to provide a retractable anchor for use in the above-mentioned capillary cable running into a well and recovery method.

[0007] In order to achieve the above objectives, this application provides the following technical solutions:

[0008] A method for running a capillary cable into a well and recovering the capillary cable comprises:

[0009] S1: Replace the Christmas tree with a tubing blowout preventer and run the tubing to the toe of the horizontal wellbore;

[0010] S2: installing the anchor at the distal end of the capillary cable, and then lowering the anchor into the vertical section of the oil pipe;

[0011] S3: Install a blowout prevention circulation device on the top of the tubing blowout preventer, and connect the pump skid to the inlet of the blowout prevention circulation device;

[0012] S4: Start the pump skid to inject working fluid into the oil pipe to push the anchor to move along the length direction of the oil pipe until the anchor moves from the far end of the oil pipe to the horizontal wellbore, and pull the capillary cable into the toe end of the horizontal wellbore through the anchor.

[0013] Preferably, after S4, the step further includes:

[0014] S5: Control the pump skid to stop;

[0015] S6: Cutting the capillary cable at the top of the wellhead of the horizontal wellbore, and installing a hanging slip at the top of the tubing blowout preventer to fix the proximal end of the capillary cable;

[0016] S7: dismantling the blowout prevention circulation device;

[0017] S8: fishing the distal end of the oil pipe into the deflection section of the horizontal wellbore;

[0018] S9: Installing a tubing hanger at the proximal end of the tubing, removing the tubing blowout preventer, and then hanging the tubing inside the tubing spool via the tubing hanger;

[0019] S10: Reinstall the Christmas tree, then resume production from the horizontal wellbore and perform detection via the capillary cable.

[0020] Preferably, after S10, the step further includes:

[0021] S11: Installing a capillary cable blowout preventer at the top of the Christmas tree;

[0022] S12: rewinding the capillary cable by a power drum, breaking the shear pin of the anchor, and then completely withdrawing the capillary cable from the horizontal wellbore.

[0023] Preferably, the step of lowering the anchor into the vertical section of the oil pipe comprises:

[0024] A sky pulley is installed on the top of the blowout prevention circulation device, and the capillary cable is wound around the outside of the sky pulley, so that the capillary cable is lowered into the vertical pipe section of the oil pipe by its own weight under the support and guidance of the sky pulley;

[0025] The step S7 further includes: removing the top pulley.

[0026] A retractable anchor is the anchor used in the capillary cable running downhole and recovery method, the retractable anchor comprising:

[0027] a mounting assembly for connecting the capillary cable to move it along its length in the oil pipe;

[0028] a positioning assembly, which is movably connected to the mounting assembly and can expand or contract along the radial direction of the mounting assembly;

[0029] A reset member has a first end connected to the mounting assembly and a second end connected to the positioning assembly to push the positioning assembly to open.

[0030] Preferably, the mounting assembly comprises a mounting member, a connecting member and a shear pin;

[0031] The tail end of the mounting member has a mounting hole extending along its own axial direction;

[0032] The connecting piece is used to connect the capillary cable, and the connecting piece is inserted into the mounting hole;

[0033] The shear pin is inserted into the mounting member and the connecting member along a radial direction of the mounting member.

[0034] Preferably, the mounting member has a central tube and a connecting tube;

[0035] The connecting tube is sleeved on the outside of the central tube;

[0036] One end of the connecting tube can be expanded or contracted and connected to the head end of the central tube, and the positioning assembly can be rotatably connected to the other end of the connecting tube.

[0037] Preferably, the positioning assembly includes a plurality of pawls, and the reset member is a spring;

[0038] The plurality of pawls and the plurality of reset members are uniformly arranged around the axial direction of the mounting member, and the plurality of reset members are connected to the corresponding pawls;

[0039] The reset member is movably arranged between the mounting member and the positioning assembly, and the reset member is telescopically extended along the radial direction of the mounting member.

[0040] Preferably, the head end of the mounting piece is a bullet-shaped structure.

[0041] Preferably, the retractable anchor is a soluble metal structure.

[0042] In this application, step S1 replaces the gas tree used in the gas production operation with a tubing blowout preventer to prepare for setting up a device for connecting a pump skid, and lowers the tubing to the toe end of the horizontal wellbore using a drilling rig, etc., to prepare for lowering the capillary cable to the toe end of the horizontal wellbore;

[0043] In step S2, to prevent the anchor from being unable to be placed in the oil pipe after the blowout prevention circulation device is installed, the distal end of the capillary cable is first connected to the anchor, and the anchor is placed in the oil pipe until it is lowered into the vertically extending section of the oil pipe.

[0044] In step S3, the proximal end of the capillary cable is passed through the blowout prevention circulation device, so that the blowout prevention circulation device is sleeved on the outside of the capillary cable, thereby enabling the blowout prevention circulation device to be installed on the upper end of the tubing blowout preventer. The blowout prevention circulation device can be connected to a pump skid, so that the working fluid can be injected into the capillary cable, and the working fluid flows through the liquid inlet pipe of the blowout prevention circulation device, the capillary cable, the horizontal wellbore and the liquid outlet pipe of the blowout prevention circulation device in sequence to achieve circulation. It should be noted that the proximal end of the capillary cable and the blowout prevention circulation device are sealed to ensure that the working fluid will not be sprayed out through the gap between the capillary cable and the blowout prevention circulation device;

[0045] Step S4 pushes the anchor to the toe end of the horizontal wellbore, thereby pulling the capillary cable into the toe end of the horizontal wellbore and fixing the anchor. Specifically, in the process of continuously inputting working fluid into the oil pipe, when the anchor is in the inner cavity of the oil pipe, the anchor is in a contracted state. Since the cross-sectional area of the anchor in the contracted state is larger, the working fluid will push the anchor to move in the oil pipe toward the forward flow direction of the working fluid during flow operation. The working fluid will eventually push the anchor from the far end of the oil pipe to its outside. After entering the toe end of the horizontal wellbore, the anchor loses the constraint of the oil pipe, and the pump pressure of the pump skid to inject the working fluid will suddenly drop, then the anchor will change to an open state to anchor at the toe end of the horizontal wellbore, thereby fixing the anchor. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0047] Figure 1 A schematic diagram of the construction of the gas production operation state of the specific embodiment provided in this application;

[0048] Figure 2 This is a schematic diagram of the construction of running the oil pipe into the horizontal wellbore in the specific embodiment provided by this application;

[0049] Figure 3 This is a schematic diagram of the construction of delivering a capillary cable to a vertical well section of an oil pipe according to a specific embodiment of the present application;

[0050] Figure 4A schematic diagram of the construction of the blowout prevention circulation device according to the specific embodiment of the present application;

[0051] Figure 5 This is a schematic diagram of the construction of delivering a capillary cable to a horizontal well section of an oil pipeline according to a specific embodiment of the present application;

[0052] Figure 6 This is a schematic diagram of the construction of delivering a capillary cable to the toe of a horizontal wellbore according to a specific embodiment of the present application;

[0053] Figure 7 This is a construction diagram of a capillary cable anchored at the toe end of a horizontal wellbore according to a specific embodiment of the present application;

[0054] Figure 8 This is a schematic diagram of the construction of cutting off the wellhead capillary cable according to a specific embodiment of the present application;

[0055] Figure 9 A schematic diagram of the construction of restoring the oil pipe to its original state according to a specific embodiment provided in this application;

[0056] Figure 10 This is a construction diagram of connecting the tubing hanger according to a specific embodiment of the present application;

[0057] Figure 11 This is a construction diagram of the oil pipe hanging operation according to a specific embodiment of the present application;

[0058] Figure 12 This is a schematic diagram of the construction of a wellhead gas tree recovery according to a specific embodiment of the present application;

[0059] Figure 13 This is a schematic diagram of the construction of a capillary cable recovery according to a specific embodiment of the present application;

[0060] Figure 14 A schematic diagram of a method for delivering a capillary cable to the toe of a horizontal wellbore according to a specific embodiment of the present application;

[0061] Figure 15 A schematic diagram of a method for restoring gas production according to a specific embodiment of the present application;

[0062] Figure 16 A schematic diagram of a method for recycling a capillary cable according to a specific embodiment of the present application;

[0063] Figure 17 This is a schematic diagram of a method for lowering a capillary cable using a top pulley according to a specific embodiment of the present application;

[0064] Figure 18 This is a diagram of the expanded state of the retractable anchor provided in the specific embodiment of the present application;

[0065] Figure 19 This is a diagram of the retractable anchor in the specific embodiment provided in this application in a retracted state.

[0066] Reference numerals:

[0067] 1-anchor; 101-mounting assembly; 1011-mounting piece; 10111-center tube; 10112-connecting tube; 1012-connecting piece; 1013-shear pin; 102-positioning assembly; 1021-pawl; 103-reset piece; 104 pin shaft;

[0068] 2-capillary cable; 3-oil tubing; 4-horizontal wellbore; 401-perforation blasthole; 402-toe end; 5-gas tree; 6-tubing blowout preventer; 7-blowout prevention circulation device; 8-sky pulley; 9-slip; 10-core fishing device; 11-tubing hanger; 12-tubing spool; 13-capillary cable blowout preventer; 14-power drum. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0070] The core of this application is to provide a capillary cable running and recovery method, which can change the current situation where the capillary cable cannot be delivered to the toe end of the horizontal wellbore. Another core of this application is to provide a retractable anchor for the anchor used in the above-mentioned capillary cable running and recovery method.

[0071] like Figure 14 As shown, the present application provides a method for running a capillary cable into a well and recovering the capillary cable, the method comprising the following steps:

[0072] Step S1: Replace the Christmas tree 5 with the tubing blowout preventer 6, and run the tubing 3 into the toe 402 of the horizontal wellbore 4;

[0073] It is understandable that when in gas production operation, Figure 1 As shown, a tubing spool 12 and a Christmas tree 5 are installed above the ground. The tubing 3 is suspended above the tubing spool 12. The distal end of the tubing 3 is inserted and maintained inside the inclination section of the horizontal wellbore 4. For detection, in this step, Figure 2As shown, the Christmas tree 5 used in gas production is replaced with a tubing blowout preventer 6 to prepare for setting up a device for connecting a pump skid, and the tubing 3 is lowered into the toe 402 of the horizontal wellbore 4 by means of a drilling rig, etc., to prepare for lowering the capillary cable 2 into the toe 402 of the horizontal wellbore 4;

[0074] Step S2: installing an anchor 1 at the distal end of the capillary cable 2, and then lowering the anchor 1 into the vertical section of the oil pipe 3;

[0075] It is understandable that in order to avoid the anchor 1 being unable to be placed in the oil pipe 3 after the blowout prevention circulation device 7 is installed, Figure 3 As shown, the distal end of the capillary cable 2 is first connected to the anchor 1, and the anchor 1 is placed into the oil pipe 3 until it is lowered into the pipe section of the oil pipe 3 extending in the vertical direction;

[0076] Step S3: Install the blowout prevention circulation device 7 on the top of the tubing blowout preventer 6, and connect the pump skid to the inlet of the blowout prevention circulation device 7;

[0077] It is understandable that in this step, Figure 4 As shown, the proximal end of the capillary cable 2 is passed through the blowout prevention circulation device 7, so that the blowout prevention circulation device 7 is sleeved on the outside of the capillary cable 2, so that the blowout prevention circulation device 7 can be installed on the upper end of the tubing blowout preventer 6. The blowout prevention circulation device 7 can be connected to a pump skid, so that the working fluid can be injected into the capillary cable 2, and the working fluid flows through the liquid inlet pipe of the blowout prevention circulation device 7, the capillary cable 2, the horizontal wellbore 4 and the liquid outlet pipe of the blowout prevention circulation device 7 in sequence to achieve circulation. It should be noted that the proximal end of the capillary cable 2 and the blowout prevention circulation device 7 are sealed and matched to ensure that the working fluid will not be sprayed out through the gap between the capillary cable 2 and the blowout prevention circulation device 7;

[0078] Step S4: Start the pump skid to inject working fluid into the oil pipe 3 to push the anchor 1 to move along the length of the oil pipe 3 until the anchor 1 moves from the distal end of the oil pipe 3 into the horizontal wellbore 4. The capillary cable 2 is pulled into the toe 402 of the horizontal wellbore 4 through the anchor 1.

[0079] It can be understood that, through this step, the anchor 1 is pushed to the toe end 402 of the horizontal wellbore 4, thereby pulling the capillary cable 2 into the toe end 402 of the horizontal wellbore 4 and achieving the fixation of the anchor 1. Specifically, in the process of continuously inputting the working fluid into the oil pipe 3, as shown in FIG. Figure 5 As shown, when the anchor 1 is in the inner cavity of the oil pipe 3, the anchor 1 is in a contracted state. Since the cross-sectional area of the anchor 1 in the contracted state is large, the working fluid will push the anchor 1 to move in the oil pipe 3 in the direction of the working fluid flowing forward during the flow operation, as shown in FIG. Figure 6As shown in FIG. 1 , the working fluid will eventually push the anchor 1 from the distal end of the oil pipe 3 to the outside thereof, that is, into the toe end 402 of the horizontal wellbore 4. At this time, the depth of the anchor 1 is greater than the depth of all the perforation holes 401 on the horizontal wellbore. Afterwards, as shown in FIG. Figure 7 As shown, the anchor 1 loses the constraint of the oil pipe 3 and the pump pressure of the pump skid injecting the working fluid suddenly drops, then the anchor 1 will turn into an open state to anchor at the toe end 402 of the horizontal wellbore 4, thereby achieving the fixation of the anchor 1.

[0080] like Figure 15 As shown, based on the above embodiment, after step S4, the following steps are further included:

[0081] Step S5: Control the pump skid to stop;

[0082] It is understandable that after the working fluid completes the function of pushing the anchor 1 to move along the oil pipe 3, in this step, the pump skid is controlled to stop so as to stop injecting the working fluid into the oil pipe 3;

[0083] Step S6: cutting the capillary cable 2 at the top of the wellhead of the horizontal wellbore 4, and installing a hanging slip 9 at the top of the tubing blowout preventer 6 to fix the proximal end of the capillary cable 2;

[0084] It is understandable that after the anchor 1 is fixed, Figure 8 As shown, the capillary cable 2 is cut off at a suitable position at the wellhead to remove the excessively long capillary cable 2; then, a hanging slip 9 is installed at the top of the tubing blowout preventer 6 to fix the proximal end of the capillary cable 2 on the hanging slip 9, so that the proximal end of the capillary cable 2 is suspended at the wellhead position, so that the capillary cable 2 can be used for detection.

[0085] Step S7: dismantling the blowout prevention circulation device 7;

[0086] It is understandable that in this step, after the capillary cable 2 is fixed, as shown in FIG. Figure 9 As shown, the blowout prevention circulation device 7 used to transport the working fluid is removed to facilitate subsequent other operations;

[0087] Step S8: fishing the distal end of the oil pipe 3 into the deflection section of the horizontal wellbore 4;

[0088] It can be understood that this step is used to adjust the oil pipe 3 into place, such as Figure 9 As shown, the oil pipe 3 is re-raised to the deflection section of the horizontal wellbore 4 by using a drilling rig and a crane with the help of a core fishing device 10;

[0089] Step S9: Install the tubing hanger 11 at the proximal end of the tubing 3 and remove the tubing blowout preventer 6. Then, hang the tubing 3 inside the tubing spool 12 via the tubing hanger 11.

[0090] It can be understood that this step is used to fix the oil pipe 3 adjusted into place, such as Figure 10 As shown, a tubing spool 12 is always installed on the ground. The tubing 3 passes through the tubing spool 12 installed on the ground and the tubing blowout preventer 6 on its top from bottom to top, in preparation for fixing the tubing 3. Specifically, a tubing hanger 11 is installed at the proximal end of the tubing 3. Figure 11 As shown, the tubing blowout preventer 6 is removed from the tubing spool 12. Then, by loosening the tubing 3 or pushing the tubing 3 downward, the tubing hanger 11 can be inserted and locked into the tubing spool 12. That is, the tubing hanger 11 is used to hang the proximal end of the tubing 3 in the tubing spool 12, so that subsequent gas production operations can be carried out through the tubing 3.

[0091] Step S10: reinstall the Christmas tree 5, then resume production in the horizontal wellbore 4, and perform detection via the capillary cable 2;

[0092] It is understandable that if Figure 12 As shown, the proximal end of the capillary cable 2 is passed through the top or side of the gas tree 5 so that the gas tree 5 is sleeved on the outside of the capillary cable 2, and the gas tree 5 can be installed on the top of the oil pipe spool 12. It should be noted that the capillary cable 2 is sealed and hung on the gas tree 5 by means of slips and seals. On the one hand, the capillary cable 2 is fixed and it is ensured that the fluid inside the horizontal wellbore 4 does not flow out through the gap between the gas tree 5 and the capillary cable 2; furthermore, while gas production is being carried out, production sampling, injection of chemicals, optical fiber monitoring, cable heating and other functions can be carried out through the capillary cable 2 lowered into the oil pipe 3, so as to continuously and long-term provide accurate data on the production of the horizontal wellbore 4, and provide key information basis for the work of early warning of changes in the horizontal wellbore 4 and formulating efficient development plans.

[0093] In summary, through this embodiment, the horizontal wellbore 4 can be detected without substantially changing the wellhead equipment and facilities and without affecting the surface gas testing and production process.

[0094] like Figure 16 As shown, based on the above embodiment, after step S10, the following steps are further included:

[0095] Step S11: Installing the capillary cable lubricant preventer 13 at the top of the Christmas tree 5;

[0096] It can be understood that this step is used to prepare for the recovery of the capillary cable 2, such as Figure 13 As shown, before the capillary cable 2 needs to be pulled out, a capillary cable blowout preventer 13 is first installed at the top of the Christmas tree 5;

[0097] Step S12: rewinding the capillary cable 2 by the power drum 14, breaking the shear pin 1013 of the anchor 1, and then completely withdrawing the capillary cable 2 from the horizontal wellbore 4;

[0098] It is understandable that if Figure 13 As shown, the capillary cable 2 is rewound by the power roller 14. When the rewinding force is large enough, the shear pins installed in the anchor 1 will be cut off, and the capillary cable 2 will be separated from the anchor 1. Continuous rewinding by the power roller 14 can completely pull the capillary cable 2 out of the horizontal wellbore 4 to restore the horizontal wellbore 4 to its original gas production operation state.

[0099] like Figure 17 As shown, based on the above embodiment, the anchor 1 is lowered into the vertical section of the oil pipe 3, specifically:

[0100] A top pulley 8 is installed on the top of the blowout prevention circulation device 7, and the capillary cable 2 is wound around the outside of the top pulley 8. Under the support and guidance of the top pulley 8, the capillary cable 2 is lowered into the vertical section of the oil pipe 3 by its own weight;

[0101] It is understandable that if Figure 4 As shown, in order to smoothly lower the anchor 1 into the oil pipe 3, a top pulley 8 is first installed above the blowout prevention circulation device 7, so that the capillary cable 2 passes through the top pulley 8 and then relies on its own weight to be lowered into the vertical well section of the horizontal wellbore 4.

[0102] Step S7 also includes: removing the top pulley 8;

[0103] It is understandable that if Figure 8 As shown, in order to prevent the top pulley 8 from affecting the drilling equipment and crane equipment in salvaging the oil pipe 3, it is removed to facilitate the smooth progress of subsequent steps.

[0104] It should be noted that the “distal end” mentioned above refers to the end deep underground and away from the operator, and the “proximal end” refers to the end close to the entrance and the operator.

[0105] In addition to the above-mentioned capillary cable running downhole and recovery method, the present application also provides an anchor 1 used in the capillary cable running downhole and recovery method disclosed in the above-mentioned embodiment, specifically a retractable anchor, which includes an installation assembly 101, a positioning assembly 102, and a reset member 103. Among them, the installation assembly 101 is used to connect the capillary cable 2 to drive it to move along its length in the oil pipe 3; the positioning assembly 102 is movably connected to the installation assembly 101, and the positioning assembly 102 can be expanded or retracted along the radial direction of the installation assembly 101; the first end of the reset member 103 is connected to the installation assembly 101, and the second end is connected to the positioning assembly 102 to push the positioning assembly 102 to expand.

[0106] like Figure 18 As shown, the installation component 101 is used to connect the distal end of the capillary cable 2 in step S2 of the capillary cable downhole and recovery method, and a positioning component 102 and a reset component 103 are fixedly connected to the installation component 101, wherein the positioning component 102 is movably connected to the installation component 101, so that the positioning component 102 can move toward or away from the installation component 101, that is, it can be expanded or contracted along the radial direction of the installation component 101, and correspondingly, the installation component 101 and the positioning component 102 are connected by the reset component 103, so that the positioning component 102 can be pushed to expand by the reset component 103.

[0107] It should be noted that the type of the installation component 101 is not limited as long as it can achieve the above-mentioned functions. For example, in some specific embodiments, the installation component 101 has an installation component 101 body with a cylindrical or arrow-shaped structure, and a U-shaped or T-shaped connection portion. The connection portion is installed on the installation component 101 body by fasteners such as screws, and the connection portion adopts a soluble metal structure. The capillary cable 2 can be pulled by the installation component 101 to move along the length direction of the oil pipe 3. When necessary, the connection portion can be dissolved to recover the capillary cable 2.

[0108] It should also be noted that there is no restriction on the type of positioning component 102 and the way of cooperating with the mounting component 101, as long as the above-mentioned functions can be achieved. For example, in some specific embodiments, the positioning component 102 includes a plurality of frames and elastic thrust covers, and the plurality of frames extend along the axial direction of the mounting component 101, and the plurality of frames are evenly arranged along the circumference of the mounting component 101, and the thrust cover is sleeved on the outside of the frame and fixedly connected to the frame. Correspondingly, the reset member 103 adopts a spring, and one end of the spring is connected to the mounting component 101, and the other end is connected to the frame, so as to drive the thrust cover to move radially outward along the mounting component 101.

[0109] It should also be noted that the type of the reset member 103 is not limited as long as it can achieve the above-mentioned functions. For example, in some specific embodiments, the reset member 103 includes a first magnetic pole and a second magnetic pole that repel each other, the first magnetic pole is installed on the positioning component 102, and the second magnetic pole is installed on the mounting component 101, and the first magnetic pole and the second magnetic pole are arranged relative to each other, then the positioning component 102 maintains a tendency to open, and after the restriction on the positioning component 102 is lost, the positioning component 102 can be opened by pushing through the reset member 103.

[0110] When in use, the capillary cable 2 is fixedly connected to the tail end of the installation component 101, and then the retractable anchor is lowered into the oil pipe 3 so that the head end of the installation component 101 faces the depth direction of the oil pipe 3, and Figure 19As shown, the retractable anchor is in a retracted state. Then, the working fluid is injected into the oil pipe 3 to push the retractable anchor to move in the oil pipe 3 in the direction of the working fluid flowing forward until it enters the horizontal wellbore 4. The retractable anchor will lose the constraint of the oil pipe 3, and the pump pressure of the pump skid to inject the working fluid will suddenly drop, and the retractable anchor will turn into an open state, as shown in FIG. Figure 18 As shown, the retractable anchor is anchored in the horizontal wellbore 4 to achieve fixation of the retractable anchor.

[0111] Based on the above embodiment, the mounting assembly 101 includes a mounting member 1011, a connecting member 1012 and a shear pin 1013; the tail end of the mounting member 1011 has a mounting hole extending along its own axial direction; the connecting member 1012 is used to connect the capillary cable 2, and the connecting member 1012 is inserted into the mounting hole; the shear pin 1013 is inserted into the mounting member 1011 and the connecting member 1012 along the radial direction of the mounting member 1011.

[0112] like Figure 18 and Figure 19 As shown, in the mounting assembly 101, the mounting member 1011 adopts a columnar structure, and a mounting hole is opened at the left end of the mounting member 1011. Preferably, the mounting hole adopts a blind hole to prevent the well environment from affecting the retractable anchor toward the depth of the horizontal wellbore 4; correspondingly, the retractable anchor is equipped with a columnar connecting member 1012, and the connecting member 1012 is inserted into the mounting hole, and the position between the two is limited by a shear pin 1013 extending radially along the mounting member 1011 and the connecting member 1012, so that the connecting member 1012 will not detach from the mounting hole.

[0113] When in use, as in step S2 of the capillary cable running downhole and recovery method, specifically, the capillary cable 2 is connected to the left end of the connector 1012 in the installation assembly 101. After the capillary cable 2 is pulled into the toe end 402 of the horizontal wellbore 4 by the retractable anchor in step S4 of the capillary cable running downhole and recovery method, the axial direction of the installation member 1011 and the connector 1012 extends along the length direction of the oil pipe 3. When the capillary cable 2 is pulled for recovery, a force is applied to the shear pin 1013 along the installation member 1011. And the axial tension of the connecting piece 1012, that is, the radial tension along the shear pin 1013 itself, when the tension applied to the shear pin 1013 is greater than the maximum shear force that it can withstand, the shear pin 1013 can be broken, just like the step S12 of recovering the capillary cable 2 in the capillary cable downhole and recovery method, so that the connecting piece 1012 can be pulled away from the mounting piece 1011, and the capillary cable 2 can be completely recovered by continuously pulling the capillary cable 2, and the retractable anchor has a simple structure and low cost.

[0114] Based on the above embodiment, the mounting member 1011 has a central tube 10111 and a connecting tube 10112; the connecting tube 10112 is sleeved on the outside of the central tube 10111; one end of the connecting tube 10112 can be opened or contracted and connected to the head end of the central tube 10111, and the positioning assembly 102 can be rotatably connected to the other end of the connecting tube 10112.

[0115] Specifically, such as Figure 18 and Figure 19 As shown, the central tube 10111 of the mounting member 1011 is a circular tube structure, the connecting tube 10112 of the mounting member 1011 is a truncated cone-shaped cover, the central tube 10111 and the connecting tube 10112 are both extended in the transverse direction, the positioning assembly 102 is connected to the left end of the connecting tube 10112, and the right end of the connecting tube 10112 is connected to the right end of the central tube 10111, so that the mounting member 1011 is connected to the capillary cable 2 through the connecting member 1012, and the right end of the connecting tube 10112 can be The right end of the movable connecting connecting tube 10112, for example, the mounting part 1011 is made of an integral aluminum part. Due to the deformation ability of the mounting part 1011 itself, the connecting tube 10112 can be opened or contracted. Alternatively, the connecting tube 10112 is made of a plastic part and is vulcanized and bonded to the center tube 10111. Due to the elasticity of the connecting tube 10112 itself, the connecting tube 10112 can be opened or contracted, etc. This arrangement makes it easy to ensure the opening or contraction of the positioning component 102.

[0116] Based on the above embodiment, the positioning assembly 102 includes a plurality of pawls 1021, and the reset member 103 is a spring; the plurality of pawls 1021 and the plurality of reset members 103 are evenly arranged axially around the mounting member 1011, and the plurality of reset members 103 are connected to the corresponding pawls 1021; and the reset member 103 is movably arranged between the mounting member 1011 and the positioning assembly 102, and the reset member 103 can be telescopically extended along the radial direction of the mounting member 1011.

[0117] Specifically, such as Figure 18 and Figure 19 As shown, the right end of the pawl 1021 is connected to the left end of the connecting cylinder 10112 through the pin shaft 104. Correspondingly, the reset member 103 extends vertically perpendicular to the axial direction of the mounting member 1011, and the two ends of the reset member 103 are respectively connected to the mounting member 1011 and the pawl 1021 to ensure smooth opening or contraction of the pawl 1021.

[0118] like Figure 18 and Figure 19 As shown, based on the above embodiment, the head end of the mounting member 1011 is a bullet-shaped structure. Such a setting is conducive to the movement of the retractable anchor along the length direction of the oil pipe 3, and is conducive to ensuring that the retractable anchor and the capillary cable 2 are moved to the preset position in the well.

[0119] On the basis of the above embodiment, the retractable anchor is a soluble metal structure. After the retractable anchor exists in the bottom hole environment for a long enough time, the retractable anchor is dissolved, so that the impact on the wellbore environment is minimized.

[0120] It should be noted that the relational terms such as "first" and "second" mentioned above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities; the "top, bottom" and directional words "up, down, left, right" mentioned above are all defined based on the drawings in the specification.

[0121] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0122] The above is a detailed introduction to the capillary cable downhole and recovery method and the retractable anchor provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the present application.

Claims

1. A method for running a capillary cable downhole and recovering the capillary cable, characterized in that: include: S1: Replace the gas tree (5) with a tubing blowout preventer (6), and lower the tubing (3) into the toe (402) of the horizontal wellbore (4); S2: installing an anchor (1) at the distal end of the capillary cable (2), and then lowering the anchor (1) into the vertical section of the oil pipe (3); S3: Installing a blowout prevention circulation device (7) on the top of the tubing blowout preventer (6), and connecting a pump skid to the inlet of the blowout prevention circulation device (7); S4: Start the pump skid to inject working fluid into the oil pipe (3) to push the anchor (1) to move along the length direction of the oil pipe (3) until the anchor (1) moves from the far end of the oil pipe (3) to the horizontal wellbore (4), and pull the capillary cable (2) into the toe end (402) of the horizontal wellbore (4) through the anchor (1).

2. The method for running and recovering a capillary cable according to claim 1, characterized in that: After S4, it also includes: S5: Control the pump skid to stop; S6: Cutting the capillary cable (2) at the top of the wellhead of the horizontal wellbore (4), and installing a hanging slip (9) at the top of the tubing blowout preventer (6) to fix the proximal end of the capillary cable (2); S7: dismantling the blowout prevention circulation device (7); S8: fishing the distal end of the oil pipe (3) into the deflection section of the horizontal wellbore (4); S9: Installing a tubing hanger (11) at the proximal end of the tubing (3), removing the tubing blowout preventer (6), and then hanging the tubing (3) inside the tubing spool (12) via the tubing hanger (11); S10: Reinstall the Christmas tree (5), then resume production of the horizontal wellbore (4), and perform detection via the capillary cable (2).

3. The method for running and recovering a capillary cable according to claim 2, characterized in that: After S10, the following steps are further included: S11: Installing a capillary cable lubricant preventer (13) at the top of the gas tree (5); S12: The capillary cable (2) is rewound by the power roller (14), and the shear pin (1013) of the anchor (1) is pulled off, thereby completely withdrawing the capillary cable (2) from the horizontal wellbore (4).

4. The method for running and recovering a capillary cable according to claim 3, characterized in that: The step of lowering the anchor (1) into the vertical pipe section of the oil pipe (3) comprises: A sky pulley (8) is installed on the top of the blowout prevention circulation device (7), and the capillary cable (2) is wound around the outside of the sky pulley (8), so that the capillary cable (2) is lowered into the vertical pipe section of the oil pipe (3) by its own weight under the support and guidance of the sky pulley (8); Said S7 further comprises: removing said sky pulley (8).

5. A retractable anchor, characterized in that: The anchor (1) used in the capillary cable downhole and recovery method according to any one of claims 1 to 4, wherein the retractable anchor comprises: A mounting assembly (101) for connecting the capillary cable (2) to drive the capillary cable to move along its length in the oil pipe (3); a positioning assembly (102) movably connected to the mounting assembly (101), and the positioning assembly (102) can expand or contract along the radial direction of the mounting assembly (101); A reset member (103) has a first end connected to the mounting assembly (101) and a second end connected to the positioning assembly (102) to push the positioning assembly (102) to open.

6. The retractable anchor according to claim 5, characterized in that: The mounting assembly (101) comprises a mounting member (1011), a connecting member (1012) and a shear pin (1013); The tail end of the mounting member (1011) has a mounting hole extending along its own axial direction; The connecting piece (1012) is used to connect the capillary cable (2), and the connecting piece (1012) is inserted into the mounting hole; The shear pin (1013) is inserted into the mounting piece (1011) and the connecting piece (1012) along the radial direction of the mounting piece (1011).

7. The retractable anchor according to claim 6, characterized in that: The mounting member (1011) comprises a central tube (10111) and a connecting tube (10112); The connecting tube (10112) is sleeved on the outside of the central tube (10111); One end of the connecting tube (10112) can be opened or contracted and connected to the head end of the central tube (10111), and the positioning assembly (102) can be rotatably connected to the other end of the connecting tube (10112).

8. The retractable anchor according to claim 7, characterized in that: The positioning assembly (102) includes a plurality of ratchet pawls (1021), and the reset member (103) is a spring; The plurality of ratchets (1021) and the plurality of reset members (103) are uniformly arranged axially around the mounting member (1011), and the plurality of reset members (103) are connected to the corresponding ratchets (1021); The reset member (103) is movably arranged between the mounting member (1011) and the positioning assembly (102), and the reset member (103) is telescopically extended along the radial direction of the mounting member (1011).

9. The retractable anchor according to claim 8, characterized in that: The head end of the mounting piece (1011) is a bullet-shaped structure.

10. The retractable anchor according to any one of claims 5 to 9, characterized in that: The retractable anchor is a soluble metal structure.

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