Electric control delay packer and cable-free coiled tubing layer clamping test process

Abstract

The invention relates to an electric control delay packer and a cableless coiled tubing clamping layer testing process, the electric control delay packer realizes automatic setting and automatic pressure relief balance under the action of a shaft high-pressure fluid, realizes the clamping layer testing operation of a cableless coiled tubing, not only can measure the pressure and temperature of a reservoir, but also can directly measure the oil content and the water content; according to the process method, the functions of electric control time delay automatic setting, electric control time delay automatic pressure relief balance and the like of the electric control time delay packer can be achieved without a cable penetrating continuous oil pipe, the purposes of horizontal well layer clamping testing and fracturing effect evaluation are achieved in cooperation with a conventional Y211 packer, a pressure control switch valve, a pressure gauge and other tool instruments, and the cost is reduced compared with that of the cable penetrating continuous oil pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of operating process methods for oil and gas field development, and in particular relates to an electrically controlled time-delay packer and a cable-free continuous oil pipe layer-stuck testing process based on the packer. Background Art

[0002] Horizontal well segmented fracturing technology is mainly used in the exploration and development of low-permeability oil and gas reservoirs such as shale oil and gas. After fracturing construction, it is necessary to evaluate the fracturing effect of the horizontal well to obtain data such as oil and water production, formation pressure, temperature, etc. of the segmented reservoir.

[0003] The main conventional methods for evaluating the effect of fracturing are: (1) conventional cableless continuous tubing bottom belt test instruments are put into the well for testing, and the test instruments are put into the target layer section in the well to obtain data such as the production profile. However, this method obtains general test data and cannot be tested in layers; (2) cable-threaded continuous tubing can be used for layered testing with electric-controlled packers + flow meters and other test instruments. The cost is relatively high, and the reservoir oil and water production needs to be calculated through theoretical calculations, rather than directly measuring the formation oil and water production.

[0004] However, the related packer tools for conventional cableless continuous tubing layer testing technology are not yet perfect, and the packer does not have the functions of electrically controlled delayed automatic sealing and electrically controlled delayed automatic pressure relief balance under cableless conditions. Therefore, in view of these problems, it is necessary to study a packer that can delay automatic sealing and the corresponding cableless continuous tubing layer testing technology. Summary of the invention

[0005] The purpose of the present invention is to provide an electrically controlled time-delayed automatic sealing packer, which has a reasonable structure, is safe and reliable, and has low cost. It has the functions of electrically controlled time-delayed automatic sealing and electrically controlled time-delayed automatic pressure relief and balance under cable-free conditions, and improves the conventional cable-free continuous oil pipe layer test process to carry out detailed test and evaluation of the target layer section.

[0006] The present invention solves the technical problem by adopting the following technical solutions:

[0007] The electric-controlled time-delay packer comprises an upper joint, a central tube and a lower joint, wherein the two ends of the central tube are fixedly connected to the upper joint and the lower joint respectively, and a rubber sleeve sealing mechanism, an electric-controlled time-delay automatic pressure relief balancing mechanism, a piston setting mechanism, a locking engagement mechanism, a hydraulic balancing mechanism, and an electric-controlled time-delay automatic setting mechanism are sequentially installed on the outer wall of the central tube from top to bottom;

[0008] After the electric-controlled time-delay packer enters the wellbore and the pressure-controlled switch valve is opened, the high-pressure fluid in the wellbore enters the hydraulic balance mechanism. Under the action of the electric-controlled time-delay automatic sealing mechanism, the hydraulic balance is broken, so that the hydraulic balance mechanism is activated, and the hydraulic balance mechanism acts on the locking and meshing mechanism. The locking and meshing mechanism activates the piston sealing mechanism, and the piston sealing mechanism acts on the rubber cylinder sealing mechanism, thereby realizing the automatic sealing of the packer;

[0009] After the coiled tubing stuck layer test process is constructed, before the packer is unsealed, the electrically controlled delayed automatic pressure relief balance mechanism starts to start, and under the action of the high-pressure fluid in the wellbore, the high-pressure fluid flows through the electrically controlled delayed automatic pressure relief balance mechanism, so that after the packer is sealed, the pressure inside the electrically controlled delayed automatic pressure relief balance mechanism is balanced with the pressure of the high-pressure fluid in the wellbore, ensuring that there is no pressure inside the packer.

[0010] Furthermore, the rubber cylinder sealing mechanism includes an upper pressure-bearing sleeve, a rubber cylinder, a spacer ring and a lower pressure-bearing ring; the piston setting mechanism includes a setting piston cylinder outer cylinder, a setting piston and a long connecting sleeve, and an annular space connecting hole is provided at the upper end of the setting piston cylinder outer cylinder;

[0011] The upper pressure sleeve is limited in the axial direction, the rubber sleeve and the spacer ring are assembled at intervals, one end of the lower pressure ring is fixedly connected to the outer sleeve of the setting piston cylinder, and the other end is assembled in contact with the rubber sleeve; the other end of the outer sleeve of the setting piston cylinder is fixedly connected to one end of the setting piston, and the other end of the setting piston is fixedly connected to one end of the long connecting sleeve, and the other end of the long connecting sleeve is fixedly connected to the locking engagement mechanism through a short connecting sleeve.

[0012] Furthermore, the electrically controlled delayed automatic pressure relief balancing mechanism includes a limit sleeve, a first stopper, a first battery pack, a first single-chip microcomputer, and a pressure relief balancing start switch. The electrically controlled delayed automatic pressure relief balancing mechanism is located in the annular position between the center liner and the outer tube of the piston cylinder. The pressure relief balancing valve core is axially installed in the center of the limit sleeve. The first stopper blocks the pressure relief balancing valve core from moving to the right, and the first stopper is fixed by electric welding through a first welding point. The first battery pack, the first single-chip microcomputer and the first welding point are connected by electrically controlled wires; the pressure relief balancing start switch is placed at the left end of the sealing piston.

[0013] Further, the locking engagement mechanism includes a locking sleeve and a locking block; the hydraulic balancing mechanism includes a balancing piston and a moving piston; the electrically controlled delayed automatic setting mechanism includes an automatic setting start switch, a second battery pack, a second single-chip microcomputer, a setting balancing valve core, and a second gear block;

[0014] One end of the locking sleeve is fixedly connected to the short connecting sleeve, and the inner wall of the other end is fixedly connected to the balancing piston, and a serrated structure is provided on the inner wall of the lower end of the locking sleeve, the locking block is placed between the central tube and the locking sleeve, and a locking screw is assembled between the locking block and the central tube, a locking ring is provided inside the locking block, and a serrated structure is provided on the locking ring, which engages with the serrated structure on the inner wall of the locking sleeve to realize a locking engagement function.

[0015] Furthermore, the other end of the balancing piston is fixedly connected to the movable piston; the balancing piston and the center tube are connected by anti-sealing shear pins, and the movable piston is axially installed with the spool of the seating balancing valve; the second block forms a second welding point by electric welding to block the right end of the spool of the seating balancing valve, and the second battery pack, the second single-chip computer and the second welding point are connected by electric control wires; the starting switch is placed at the left end of the lower joint; a connecting hole is provided on the center tube, and the connecting hole faces the hydraulic balancing chamber, and the hydraulic balancing chamber is a sealed cavity surrounded by the center tube, the balancing piston and the movable piston, and the left and right cross-sectional areas in the axial direction of the hydraulic balancing chamber are the same.

[0016] The cable-free coiled tubing layer-stuck testing process based on the above-mentioned packer includes the following steps:

[0017] Under the wellhead pressure, the stuck layer test tool string is lowered through the coiled tubing: coiled tubing + rivet connector + hydraulic release + centralizer + electric control packer + pressure-controlled switch valve + test instrument + Y211 packer + mechanical coupling locator + guide shoe plug;

[0018] The coiled tubing is lowered to the predetermined position of the short casing. The actual position of the short casing is determined by the mechanical coupling locator in the tool string combined with the increase in the lifting weight to calibrate the depth. Then the coiled tubing tool string is lifted to the predetermined setting position of the two stuck layer packers to achieve positioning.

[0019] Set the Y211 packer; open the pressure-controlled switch valve, and then the cement truck releases the pressure to 0; at the same time, the electric-controlled time-delay packer is automatically set by the high-pressure fluid in the wellbore; check the upper part of the electric-controlled time-delay packer, and the result of the seal test can also prove whether the pressure-controlled switch valve has been opened.

[0020] After confirming that the pressure-controlled switch valve has been opened and both packers have been tested, the testing instrument starts to perform pressure and temperature tests on the stuck layer of the horizontal well, and the oil and water content of the stuck layer can be obtained through the liquid discharge from the wellhead of the outlet tank;

[0021] After the electric-controlled time-delay packer is set and reaches the stuck layer test time, the electric control automatically releases the pressure to balance, and then lifts up to release the two stuck layer packers;

[0022] After confirming that the two packers in the tubing string have been completely unsealed, the coiled tubing tool string is pulled out to complete the construction process of the coiled tubing stuck layer test.

[0023] Furthermore, the stuck layer testing process requires the use of continuous tubing for sand flushing, well clearance, scraping, and well washing operations before starting.

[0024] Furthermore, the method for opening the pressure-controlled switch valve is: pressurizing the casing of the cement truck to open the pressure-controlled switch valve, and observing the overflow at the wellhead through the outlet tank to verify whether the pressure-controlled switch valve is open. If there is an overflow display and the overflow is continuous and stable, it means that the pressure-controlled switch valve is in a good opening state.

[0025] The advantages and positive effects of the present invention are:

[0026] 1. The electric-controlled time-delay packer of the present invention has the functions of electric-controlled time-delay automatic setting and electric-controlled time-delay automatic pressure relief and balance under cable-free conditions, improves the conventional cable-free continuous tubing layer-stuck test process, and performs fine test and evaluation of the target layer section. The electric-controlled time-delay packer can also realize the functions of time-delay automatic setting and time-delay automatic pressure relief and balance without the need to pass the cable continuous tubing. In combination with conventional Y211 packers, pressure-controlled switch valves, pressure gauges and other tools and instruments, horizontal well layer-stuck tests can be realized to achieve the purpose of evaluating the fracturing effect;

[0027] 2. The stuck layer testing process of the present invention can realize functions such as the electrically controlled delayed packer, the electrically controlled delayed automatic setting of the packer, and the electrically controlled delayed automatic pressure relief balance without wearing a cable coiled tubing. It can be used in conjunction with conventional Y211 packers, pressure-controlled switch valves, pressure gauges and other tools and instruments to achieve the purpose of horizontal well stuck layer testing and evaluation of fracturing effects. It is less time consuming than wearing a cable coiled tubing, and the oil and water production of the reservoir can be directly measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0029] Figure 1 A structural cross-sectional view of the upper portion of the electric-controlled time-delay packer provided in an embodiment of the present invention;

[0030] Figure 2 A structural cross-sectional view of the lower part of the electric-controlled time-delay packer provided in an embodiment of the present invention;

[0031] Figure 3 A continuous tubing running into a stuck layer testing tool string is provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0035] Example 1

[0036] like Figure 1 to Figure 2 The electric-controlled time-delay packer provided in this embodiment comprises an upper joint, a central tube and a lower joint, the two ends of the central tube are respectively fixedly connected to the upper joint and the lower joint, and a rubber cylinder sealing mechanism, an electric-controlled time-delay automatic pressure relief balancing mechanism, a piston setting mechanism, a locking engagement mechanism, a hydraulic balancing mechanism, and an electric-controlled time-delay automatic setting mechanism are sequentially installed on the outer wall of the central tube from top to bottom;

[0037] After the electric-controlled packer enters the wellbore and the pressure-controlled switch valve is opened, the high-pressure fluid in the wellbore enters the hydraulic balance mechanism. Under the action of the electric-controlled delayed automatic sealing mechanism, the hydraulic balance is broken, so that the hydraulic balance mechanism is activated, and the hydraulic balance mechanism acts on the locking and meshing mechanism. The locking and meshing mechanism activates the piston sealing mechanism, and the piston sealing mechanism acts on the rubber cylinder sealing mechanism, thereby realizing the automatic sealing of the packer;

[0038] After the coiled tubing stuck layer test process is constructed, before the packer is unsealed, the electrically controlled delayed automatic pressure relief balance mechanism starts to start, and under the action of the high-pressure fluid in the wellbore, the high-pressure fluid flows through the electrically controlled delayed automatic pressure relief balance mechanism, so that after the packer is sealed, the pressure inside the electrically controlled delayed automatic pressure relief balance mechanism is balanced with the pressure of the high-pressure fluid in the wellbore, ensuring that there is no pressure inside the packer.

[0039] Specifically, the rubber cylinder sealing mechanism includes an upper pressure-bearing sleeve, a rubber cylinder, a spacer ring and a lower pressure-bearing ring; the piston setting mechanism includes a setting piston cylinder outer cylinder, a setting piston and a long connecting sleeve, and an annular space connecting hole is arranged at the upper end of the setting piston cylinder outer cylinder;

[0040] The upper pressure sleeve is limited in the axial direction, the rubber sleeve and the spacer ring are assembled at intervals, one end of the lower pressure ring is fixedly connected to the outer sleeve of the setting piston cylinder, and the other end is assembled in contact with the rubber sleeve; the other end of the outer sleeve of the setting piston cylinder is fixedly connected to one end of the setting piston, and the other end of the setting piston is fixedly connected to one end of the long connecting sleeve, and the other end of the long connecting sleeve is fixedly connected to the locking engagement mechanism through a short connecting sleeve.

[0041] The electrically controlled delayed automatic pressure relief balancing mechanism includes a limit sleeve, a first stopper, a first battery pack, a first single-chip microcomputer, and a pressure relief balancing start switch. The electrically controlled delayed automatic pressure relief balancing mechanism is located in the annular position between the central liner and the outer tube of the piston cylinder. The pressure relief balancing valve core is axially installed in the center of the limit sleeve. The first stopper blocks the pressure relief balancing valve core from moving to the right, and the first stopper is fixed by electric welding through the first welding point. The first battery pack, the first single-chip microcomputer and the first welding point are connected by electrically controlled wires; the pressure relief balancing start switch is placed on the left end of the sealing piston.

[0042] The locking engagement mechanism includes a locking sleeve and a locking block; the hydraulic balancing mechanism includes a balancing piston and a moving piston; the electrically controlled delayed automatic setting mechanism includes a setting start switch, a second battery pack, a second single-chip microcomputer, a setting balancing valve core, and a second gear block;

[0043] One end of the locking sleeve is fixedly connected to the short connecting sleeve, and the inner wall of the other end is fixedly connected to the balancing piston, and a sawtooth structure is provided on the inner wall of the lower end of the locking sleeve, the locking block is placed between the central tube and the locking sleeve, and a locking screw is assembled between the locking block and the central tube, a locking ring is provided inside the locking block, and a sawtooth structure is provided on the locking ring, which meshes with the sawtooth structure on the inner wall of the locking sleeve to realize a locking meshing function;

[0044] The other end of the balancing piston is fixedly connected to the movable piston; the balancing piston and the center tube are connected by anti-sealing shear pins, and the movable piston is axially installed with the spool of the seating balancing valve; the second block forms a second welding point by electric welding to block the right end of the spool of the seating balancing valve, and the second battery pack, the second single-chip microcomputer and the second welding point are connected by electric control wires; the seating start switch is placed at the left end of the lower joint; a connecting hole is provided on the center tube, and the connecting hole faces the hydraulic balancing chamber, and the hydraulic balancing chamber is a sealed cavity surrounded by the center tube, the balancing piston and the movable piston, and the left and right cross-sectional areas in the axial direction of the hydraulic balancing chamber are the same.

[0045] Specifically, Figure 1 , Figure 2 As shown, the rubber sleeve sealing mechanism 2 includes an upper pressure-bearing sleeve 2a, a rubber sleeve 2b, a spacer ring 2c and a lower pressure-bearing ring 2d; the electrically controlled delayed automatic pressure relief balancing mechanism 3 includes a pressure relief balancing start switch 3a, a first battery pack 3b, a first single-chip computer 3c, a limit sleeve 3d, a pressure relief balancing valve core 3e, and a first gear block 3f; the piston setting mechanism 4 includes an annular space connecting hole 4a, a setting piston cylinder outer cylinder 4b, a setting piston 4c, a long connecting sleeve 4d and a short connecting sleeve 4e; the locking engagement mechanism 5 includes an upper connecting sleeve 5a, a locking sleeve 5b, a locking screw 5c, a locking block 5d, and a locking ring 5e; the hydraulic balancing mechanism 6 includes a balancing piston 6a, an anti-setting shear pin 6b and a moving piston 6c; the electrically controlled delayed automatic setting mechanism 7 includes a setting mechanism start switch 7a, a second battery pack 7b, a second single-chip computer 7c, a setting balancing valve core 7d, and a second gear block 7f;

[0046] The electrically controlled delayed sealer is assembled and connected with an upper joint 1, a rubber cylinder sealing mechanism 2, an electrically controlled delayed automatic pressure relief and balancing mechanism 3, a piston sealing mechanism 4, a locking and engaging mechanism 5, a hydraulic balancing mechanism 6, an electrically controlled delayed automatic sealing mechanism 7 and a lower joint 10 from left to right in sequence; the rubber cylinder sealing mechanism 2, the electrically controlled delayed automatic pressure relief and balancing mechanism 3, the piston sealing mechanism 4, the locking and engaging mechanism 5, the hydraulic balancing mechanism 6, and the electrically controlled delayed automatic sealing mechanism 7 are sequentially mounted on the center liner 8 from top to bottom, and the center liner 8 is mounted on the center pipe 9, and the left end of the center pipe 9 is connected with the upper joint 1, and the right end is connected with the lower joint 10.

[0047] The upper right end of the upper joint 1 is provided with a male buckle, which is threadedly connected to the female buckle on the left end of the upper pressure-bearing sleeve 2a; the lower right end of the upper joint 1 is provided with a female buckle, which is threadedly connected to the male buckle on the left end of the center tube 9; similarly, the left end of the lower joint 10 is provided with a female buckle, which is threadedly connected to the male buckle on the right end of the center tube 9; the rubber cylinder sealing mechanism 2 is sleeved in the center liner 8, and the center liner 8 is sleeved on the center tube 9 and placed at the right end of the upper joint 1; the left end of the upper pressure-bearing sleeve 2a is provided with a female buckle, which is threadedly connected to the upper joint The right end of the head 1 is connected with a male thread; a female thread is arranged inside the upper pressure-bearing sleeve 2a, which is connected with the male thread of the upper end of the center liner 8 and is placed at the left end of the rubber cylinder sealing mechanism 2; the rubber cylinder 2b and the spacer ring 2c are assembled at intervals, and are contacted and assembled with the upper pressure-bearing sleeve 2a in sequence, and are placed in the middle position of the rubber cylinder sealing mechanism 2; a male thread is arranged at the right end of the lower pressure-bearing ring 2d, and the right end is connected with the female thread of the outer tube 4b of the setting piston cylinder; the left end is contacted and assembled with the right end rubber cylinder 2b, and is placed at the right end of the rubber cylinder sealing mechanism 2.

[0048] An electrically controlled delayed automatic pressure relief balance mechanism 3 is arranged between the outer tube 4b of the sealing piston cylinder and the central liner 8; the first battery pack 3b and the first single-chip computer 3c are placed on the upper left end of the sealing piston 4c, and the first battery pack 3b, the first single-chip computer 3c and the first welding point 3g are connected by electrically controlled wires; the first stop block 3f forms the first welding point 3g by electric welding to block the right end of the pressure relief balance valve core 3e; the pressure relief balance start switch 3a is placed on the left end of the sealing piston 4c, and the pressure relief balance start switch 3a represents an electric contact switch. After the sealing mechanism of the packer is started, the sealing piston 4c moves to the left, and after moving to the designed position, it contacts the 3a contact switch, and the pressure relief balance is automatically released. The first battery pack 3b and the first single-chip computer 3c in the balance mechanism start timing work. After the first welding point 3g is melted, (under the action of wellbore pressure), the pressure relief balance valve core 3e opens, and the liquid in the annular space of the oil casing enters the cavity of the outer tube 4b of the sealing piston cylinder, realizing automatic pressure relief balance inside the tool; the pressure relief balance valve core 3e, the first gear block 3f and the first welding point 3g are placed at the right end of the limit sleeve 3d; the limit sleeve 3d has a central opening, and the pressure relief balance valve core 3e is placed at the central opening position of the limit sleeve 3d, and the right end is provided with a first gear block 3f to block the pressure relief balance valve core 3e from moving to the right, and the first gear block 3f is fixed to the center liner 8 by electric welding through the first welding point 3g.

[0049] The piston setting mechanism 4 is sleeved in the central liner 8 and is placed at the left end of the upper connecting sleeve;

[0050] The left end of the outer tube 4b of the setting piston cylinder is provided with a female buckle inside, which is assembled and connected with the lower pressure ring 2d; the right end is provided with a female buckle inside, which is threadedly connected with the male buckle on the left end of the setting piston 4c; and the upper end is provided with an annular space connecting hole 4a; the left end of the setting piston 4c is provided with a male buckle outside, which is threadedly connected with the female buckle of the outer tube 4b of the setting piston cylinder; the right end is provided with a female buckle inside, which is threadedly connected with the male buckle of the long connecting sleeve 4d, and the long connecting sleeve 4d is threadedly connected with the short connecting sleeve 4e; the left end of the short connecting sleeve 4e is provided with a female buckle inside, which is threadedly connected with the male buckle of the long connecting sleeve 4d; the right end is provided with a male buckle outside, which is threadedly connected with the female buckle of the locking sleeve 5b;

[0051] The locking and engaging mechanism 5 is sleeved in the center tube 9 and placed at the right end of the short connecting sleeve 4e; the left end of the locking sleeve 5b is provided with a female buckle, which is threadedly connected to the short connecting sleeve 4e; the right end is provided with a female buckle, which is threadedly connected to the balancing piston 6a; and the upper end is provided with a male buckle thread, which is threadedly connected to the upper connecting sleeve 5a; and a serration structure is provided at the inner position of the lower end; the upper connecting sleeve 5a is provided with an upper connecting sleeve 5a at the upper end, and a female buckle is provided inside the upper connecting sleeve 5a and is threadedly connected to the male buckle at the upper end of the locking sleeve 5b; the locking block 5d is placed between the center tube and the locking sleeve 5b, and a screw hole is opened at the upper end, which is assembled and connected with the locking screw 5c; and a locking ring 5e is provided inside the locking block 5d, and a serration structure is provided on the upper part of the locking ring, which is engaged with the serration structure provided at the inner position of the lower end of the locking sleeve 5b to realize the locking and engaging function; the locking screw 5c is assembled inside the screw hole of the locking block 5d, and is assembled and connected with the screw hole at the upper end of the center tube 9.

[0052] The hydraulic balancing mechanism 6 is sleeved on the center tube 9 and placed at the right end of the locking sleeve 5b; a male buckle is arranged on the outside of the left end of the balancing piston 6a, which is threadedly connected to the female buckle of the locking sleeve 5b; a male buckle is arranged on the outside of the right end, which is threadedly connected to the female buckle of the moving piston 6c; a female buckle is arranged inside the left end of the moving piston 6c, which is threadedly connected to the male buckle on the outside of the right end of the balancing piston 6a; a pin hole is arranged on the upper end of the balancing piston 6a, and the anti-seating shear pin 6b is placed inside the balancing piston 6a and the pin hole of the moving piston and fixedly assembled with the center tube; the moving piston 6c is set in the shape of a middle opening, and a sealing balancing valve core 7d is arranged inside the opening position; an electrically controlled delayed automatic sealing mechanism 7 is arranged between the outer tube 6d of the sealing piston cylinder and the center tube 9, and the second battery pack 7b and the second single-chip computer 7c are placed on the upper left end of the sealing start switch 7a, The second battery pack 7b, the second single-chip computer 7c and the second welding point 7e are connected by electric control wires; the second stopper 7f is formed by electric welding to form a second welding point 7e to block the right end of the valve core 7d of the sealing balance valve, and the sealing start switch 7a is placed at the left end of the lower joint; the sealing balance valve core 7d, the second stopper 7e and the second welding point 7f are placed at the right end of the movable piston 6c; the movable piston 6c has a central opening, and the sealing balance valve core 7d is placed at the central opening position of the movable piston 6c, and a second stopper 7e is provided at its right end to block the sealing balance valve core 7d from moving to the right, and the second stopper 7e is fixed to the center pipe 9 by electric welding through the second welding point 7f; wherein, the sealing mechanism start switch 7a adopts an existing product, and its operation is controlled by removing the wire guard on the packer so that the compression spring in the sealing mechanism start switch 7a drives the contact switch to connect the circuit.

[0053] A connecting hole 7g is provided on the center pipe 9 for the high-pressure fluid flow in the wellbore to enter the hydraulic balance chamber, and the left and right cross-sectional areas of the hydraulic balance chamber are the same; a male buckle is provided inside the left end of the lower joint 10, which is threadedly connected to the female buckle on the right end of the outer tube 6d of the sealing piston cylinder; a female buckle is provided inside the left end of the lower joint 10, which is threadedly connected to the male buckle on the right end of the center pipe 9.

[0054] In this embodiment, the working principle of the electric-controlled delayed automatic setting is as follows: when the packer is lowered into the wellbore along with the tubing string, it takes a certain amount of time to reach the predetermined position; therefore, after the upper wire guard of the packer is removed and the packer is connected to the coiled tubing string, the contact switch in the circuit cavity of the setting mechanism is pushed by the spring, the circuit is connected, and the system enters the timing working state; after the tool enters the predetermined position in the wellbore, the casing is pressurized to open the pressure-controlled switch valve, and under the action of the 15MPa high-pressure fluid in the wellbore, the high-pressure fluid flows into the hydraulic balance cavity through the connecting hole 7g, and due to the movement A sealing balancing valve core 7d is provided in the piston 6c, so that the high-pressure fluid acts on both ends of the balancing piston 6a and the moving piston 6c. In addition, the cross-sectional areas of the left and right ends of the balancing piston 6a and the moving piston 6c are the same. According to the F=PS principle, the force acting on the balancing piston 6a in the left direction and the force acting on the moving piston 6c in the right direction in the hydraulic balancing chamber 7h are balanced. As long as the sealing balancing valve core 7d does not move to the right, the moving piston 6c will never move, the anti-sealing shear pin 6b will never be cut off, and the piston sealing mechanism 4 will not be started. Therefore, after the tool is put into the well with the tubing, after a certain delay time through the second single-chip computer 7c, the electronically controlled delayed sealing system starts to start, and the second welding point 7e at the second gear block 7f is melted, so that the second gear block 7f is no longer fixed, and the obstruction of the second gear block 7f to the sealing balance valve core 7d is removed. Under the action of 15MPa high-pressure fluid in the wellbore, the sealing balance valve core 7d moves to the right, and the high-pressure fluid flows through the position of the sealing balance valve core 7d, enters the air balance chamber, and begins to break the hydraulic balance, thereby starting the hydraulic balance mechanism.

[0055] When the high-pressure fluid in the air balance chamber 7h is greater than the starting pressure of the anti-setting shear pin 6b, the moving piston 6c cuts off the anti-setting shear pin 6b and pushes the balance piston 6a; the balance piston 6a pushes the locking sleeve 5b to move left, so that the locking teeth on the locking sleeve 5b engage with the locking teeth on the locking ring 5e, thereby realizing the locking engagement function of the tool.

[0056] At the same time, the locking sleeve 5b moves to the left, pushing the long connecting sleeve 4d to the left, starting the piston sealing mechanism 4, and continuing to push the sealing piston 4c to the left. The sealing piston 4c pushes the piston cylinder outer tube 4b to the left, pushing the lower pressure ring 2d to the left, squeezing the three rubber cylinders, thereby realizing the automatic sealing of the tool.

[0057] After the tool has been in the wellbore for a certain period of time to undergo the layer-stuck test process, before unsealing the packer, the internal pressure of the tool needs to be balanced to prevent the tool from being under pressure when it is pulled out of the wellhead. Therefore, after the packer has finished working, after a certain delay time through the first single-chip microcomputer 3c, the electrically controlled delayed pressure relief balance system starts to start, and the first welding point 3g at the first gear block 3f is melted, so that the first gear block 3f is no longer fixed, and the first gear block 3f is removed from blocking the automatic pressure relief balance valve core 3e. Under the action of the 15MPa high-pressure fluid in the wellbore, the pressure relief balance valve core 3e moves to the right, and the high-pressure fluid flows through the position of the pressure relief balance valve core 3e and enters the air balance chamber, so that the pressure in the compressed air chamber after the tool is sealed is balanced with the pressure relief of the high-pressure fluid in the wellbore, ensuring that there is no pressure inside the tool;

[0058] When the packer is unsealed and removed: the continuous tubing string is lifted up by 1.5-2t, driving the center pipe 9 to move to the left, pulling off the locking screw 5c, driving the locking sleeve 5b to move to the left, so that the locking teeth on the locking sleeve 5b and the locking teeth on the locking ring 5e are disengaged from each other, realizing the locking and unlocking function of the tool, and the locking sleeve 5b moves to the left to the limit position at the right end of the lock block 5d, and cannot move to the left. Therefore, the locking sleeve 5b inside the tool cannot continue to move to the left under the action of the 15MPa high-pressure fluid in the wellbore, and cannot push the piston sealing mechanism to continue to move to the left. The three rubber cylinders inside the tool are no longer affected by the sealing pressure in the wellbore, and the oil sleeves in the tool are connected and the pressure is balanced. Therefore, the rubber cylinders are automatically unsealed under the action of their own rebound, and then the packer with electric control delay automatic sealing can be removed by lifting.

[0059] Example 2

[0060] The cable-free coiled tubing stuck layer testing process based on the electric-controlled time-delay packer provided in this embodiment specifically includes the following steps:

[0061] (1) On the basis of the 130 / 105MPa large-diameter wellhead gate at the wellhead, use a 2-inch coiled tubing bottom belt flushing head to flush the sand, and use clean water at a displacement of 400 liters / minute to positively circulate the sand until the inlet and outlet liquid properties are consistent, then pull out the coiled tubing; then lower the bottom belt of the connected tubing with a Φ114×1.5m well gauge to the bottom of the artificial well at a speed of 15 meters / minute. If there is resistance in the middle, the pressure shall not exceed 30KN. After the coiled tubing is pulled out and the well gauge is pulled out, it is checked. If the well gauge is normal, the coiled tubing bottom belt scraper is lowered again at a speed of 15 meters / minute to repeatedly scrape the packer setting position. After the coiled tubing is pulled out and the scraper is pulled out, the entire wellbore is pressure tested to 80% of the casing internal pressure resistance value. After the pressure test is qualified, the next step is carried out;

[0062] (2) On the cement truck, use 60m of continuous oil pipe 3Clean water is circulated at a rate of 300 L / min to wash the well until the inlet and outlet liquids are consistent, and then the coiled tubing is pulled out;

[0063] (3) Use clean water to test the full seal of the BOP at a pressure of 60 MPa, maintain pressure for 15 minutes, and a pressure drop of 0.1 MPa. Test the half seal of the BOP at a pressure of 60 MPa, maintain pressure for 15 minutes, and a pressure drop of 0.1 MPa. Test the entire BOP at a pressure of 60 MPa, maintain pressure for 15 minutes, and a pressure drop of 0.1 MPa. The pressure test is qualified;

[0064] (4) The wellhead pressure is 15 MPa. The stuck layer test tool string is lowered through the coiled tubing: coiled tubing A+rivet connector B+hydraulic release C+stabilizer D+electrically controlled time-delay packer E+pressure-controlled switch valve F+test instrument G+Y211 packer H+mechanical coupling locator I+guide shoe plug J;

[0065] (5) The tubing is lowered to 30 meters below the predetermined position of the short casing through the continuous tubing, and the tubing is lifted. At this time, the hanging weight is displayed as 1.5 tons. After being lifted to a certain position, the hanging weight suddenly increases to 4.0 tons, and then returns to 1.5 tons after further lifting. The increase value is 2.5 tons, which proves that the mechanical coupling locator has reached the short casing position. After that, the continuous tubing is lifted at a speed of 15 meters / minute to the predetermined sealing position of the two stuck layer packers with reference to the first short casing position for positioning; it should be noted that the short casing in this step is a short casing designed separately at the lowest end of the casing in the wellbore, which is used as a reference to determine the actual wellbore depth;

[0066] (6) Setting the Y211 packer: After reaching the predetermined setting position of the two stuck packers, lift the coiled tubing by 1 to 1.5 m, with a load of 25 kN, lower the string by 40 kN, and set the Y211 packer;

[0067] (7) Check the seal of the upper part of the Y211 packer: open the casing valve, pressurize the casing to 35MPa (35MPa-15=20MPa) through the cement truck, maintain the pressure for 15 minutes, and the pressure drop is 0.1MPa. The seal is qualified;

[0068] (8) The cement truck continues to pressurize the casing to 45MPa (45MPa-15=30MPa), stabilize the pressure for 15 minutes, open the pressure-controlled switch valve, and release the fluid through the coiled tubing. The fluid output is 0.3 cubic meters in half an hour, which proves that the pressure-controlled switch valve has been opened. Then the cement truck releases the pressure to 0. It should be pointed out that the wells tested for coiled tubing layer jam are generally in a wellbore pressure state, and 15MPa is the original wellbore pressure. The cement truck pressurizes the wellbore to 45MPa, first balancing the wellbore pressure of 15MPa, so the pressure on the pressure-controlled switch valve is 30MPa.

[0069] (9) At the same time, after the pressure-controlled switch valve is opened, the 15MPa high-pressure fluid in the wellbore enters the electric-controlled time-delay packer. It is estimated that after 15 minutes, the 15MPa high-pressure fluid in the wellbore will cause the electric-controlled time-delay packer to be automatically sealed under the action of the wellbore pressure;

[0070] (10) Check the seal of the upper part of the electric-controlled time-delay packer: open the casing valve, pressurize the casing of the cement truck to 35MPa (35MPa-15=20MPa), stabilize the pressure for 15 minutes, and the pressure drop is 0.1MPa. If the seal is qualified, the cement truck will then release the pressure to 0; at the same time, it is proved again that the pressure-controlled switch valve is open;

[0071] (11) After confirming that the pressure-controlled switch valve has been opened and both packers have been tested, the test instrument starts to test the temperature and pressure of the stuck layer, and directly measures the oil and water content of the stuck layer through the outlet tank wellhead: 4mm oil nozzle releases, oil pressure is 15-13MPa, and water output is 0.7m in 1 hour. 3 , oil output 0.3m 3 , (40% containing emulsified water has been deducted);

[0072] (12) The two packers have been set and reached the stuck layer test time. It is estimated that the electric-controlled time-delay packer will automatically release pressure and balance after 15 minutes. Then lift 20-30 kN to unseal the Y211 packer and the electric-controlled time-delay packer.

[0073] (13) The continuous tubing is then lifted and lowered by no more than 15 kN to move the tubing string, which proves that the two packers in the tubing string have been completely unsealed; the continuous tubing tool string is then removed, thus completing the construction process of the continuous tubing stuck layer test.

[0074] The process method of the present invention can realize functions such as electric-controlled automatic setting of the electric-controlled delayed packer and electric-controlled automatic pressure relief balance without the need to wear a cable coiled tubing. It can be used in conjunction with conventional Y211 packers, pressure-controlled switch valves, testing instruments and other tools and instruments to achieve the purpose of stratified testing of horizontal wells and evaluation of fracturing effects, and the cost is lower than that of wearing a cable coiled tubing.

[0075] It should be noted that the test instrument can use existing products. It has sensors inside, but the measured values ​​are not directly obtained from temperature and pressure. Instead, the values ​​of pressure and temperature can be obtained by converting the values ​​in the sensors after ground interpretation and evaluation.

[0076] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. Electric controlled time-delay packer, characterized by: It includes an upper joint, a central tube and a lower joint, the two ends of the central tube are fixedly connected to the upper joint and the lower joint respectively, and the outer wall of the central tube is sequentially installed with a rubber cylinder sealing mechanism, an electric-controlled delayed automatic pressure relief balancing mechanism, a piston sealing mechanism, a locking engagement mechanism, a hydraulic balancing mechanism, and an electric-controlled delayed automatic sealing mechanism from top to bottom; After the electric-controlled time-delay packer enters the wellbore and the pressure-controlled switch valve is opened, the high-pressure fluid in the wellbore enters the hydraulic balance mechanism. Under the action of the electric-controlled time-delay automatic sealing mechanism, the hydraulic balance is broken, so that the hydraulic balance mechanism is activated, and the hydraulic balance mechanism acts on the locking and meshing mechanism. The locking and meshing mechanism activates the piston sealing mechanism, and the piston sealing mechanism acts on the rubber cylinder sealing mechanism, thereby realizing the automatic sealing of the packer; After the coiled tubing stuck layer test process is constructed, before the packer is unsealed, the electrically controlled delayed automatic pressure relief balance mechanism starts to start, and under the action of the high-pressure fluid in the wellbore, the high-pressure fluid flows through the electrically controlled delayed automatic pressure relief balance mechanism, so that after the packer is sealed, the pressure inside the electrically controlled delayed automatic pressure relief balance mechanism is balanced with the pressure of the high-pressure fluid in the wellbore, ensuring that there is no pressure inside the packer.

2. The electrically controlled time-delay packer according to claim 1, characterized in that: The rubber cylinder sealing mechanism includes an upper pressure-bearing sleeve, a rubber cylinder, a spacer ring and a lower pressure-bearing ring; the piston setting mechanism includes a setting piston cylinder outer cylinder, a setting piston and a long connecting sleeve, and an annular space connecting hole is arranged at the upper end of the setting piston cylinder outer cylinder; The upper pressure sleeve is limited in the axial direction, the rubber sleeve and the spacer ring are assembled at intervals, one end of the lower pressure ring is fixedly connected to the outer sleeve of the setting piston cylinder, and the other end is assembled in contact with the rubber sleeve; the other end of the outer sleeve of the setting piston cylinder is fixedly connected to one end of the setting piston, and the other end of the setting piston is fixedly connected to one end of the long connecting sleeve, and the other end of the long connecting sleeve is fixedly connected to the locking engagement mechanism through a short connecting sleeve.

3. The electrically controlled time-delay packer according to claim 2, characterized in that: The electrically controlled delayed automatic pressure relief balancing mechanism includes a limit sleeve, a first stopper, a first battery pack, a first single-chip microcomputer, and a pressure relief balancing start switch. The electrically controlled delayed automatic pressure relief balancing mechanism is located in the annular position between the central liner and the outer tube of the piston cylinder. The pressure relief balancing valve core is axially installed in the center of the limit sleeve. The first stopper blocks the pressure relief balancing valve core from moving to the right, and the first stopper is fixed by electric welding through the first welding point. The first battery pack, the first single-chip microcomputer and the first welding point are connected by electrically controlled wires; the pressure relief balancing start switch is placed on the left end of the sealing piston.

4. The electrically controlled time-delay packer according to claim 2, characterized in that: The locking engagement mechanism includes a locking sleeve and a locking block; the hydraulic balancing mechanism includes a balancing piston and a moving piston; the electrically controlled delayed automatic setting mechanism includes a setting start switch, a second battery pack, a second single-chip microcomputer, a setting balancing valve core, and a second gear block; One end of the locking sleeve is fixedly connected to the short connecting sleeve, and the inner wall of the other end is fixedly connected to the balancing piston, and a serrated structure is provided on the inner wall of the lower end of the locking sleeve, the locking block is placed between the central tube and the locking sleeve, and a locking screw is assembled between the locking block and the central tube, a locking ring is provided inside the locking block, and a serrated structure is provided on the locking ring, which engages with the serrated structure on the inner wall of the locking sleeve to realize a locking engagement function.

5. The electrically controlled time-delay packer according to claim 4, characterized in that: The other end of the balancing piston is fixedly connected to the movable piston; the balancing piston and the center tube are connected by anti-sealing shear pins, and the movable piston is axially installed with the spool of the seating balancing valve; the second block forms a second welding point by electric welding to block the right end of the spool of the seating balancing valve, and the second battery pack, the second single-chip microcomputer and the second welding point are connected by electric control wires; the seating start switch is placed at the left end of the lower joint; a connecting hole is provided on the center tube, and the connecting hole faces the hydraulic balancing chamber, and the hydraulic balancing chamber is a sealed cavity surrounded by the center tube, the balancing piston and the movable piston, and the left and right cross-sectional areas in the axial direction of the hydraulic balancing chamber are the same.

6. A cable-free coiled tubing layer-stuck testing process based on the electric-controlled time-delay packer according to any one of claims 1 to 6, characterized in that: The steps include: Under the wellhead pressure, the stuck layer test tool string is lowered through the coiled tubing: coiled tubing + rivet connector + hydraulic release + centralizer + electric control delay packer + pressure-controlled switch valve + test instrument + Y211 packer + mechanical coupling locator + guide shoe plug; The coiled tubing is lowered to the predetermined position of the short casing. The actual position of the short casing is determined by the mechanical coupling locator in the tool string combined with the increase in the lifting weight to calibrate the depth. Then the coiled tubing tool string is lifted to the predetermined setting position of the two stuck layer packers to achieve positioning. Set the Y211 packer; open the pressure-controlled on-off valve, and then the cement truck releases the pressure to 0; at the same time, the electric-controlled time-delay packer is automatically set by the high-pressure fluid in the wellbore; check the seal of the upper part of the electric-controlled time-delay packer, and the result of the seal check can also prove whether the pressure-controlled on-off valve has been opened; After confirming that the pressure-controlled switch valve has been opened and both packers have been sealed, the measuring mechanism begins to perform pressure and temperature tests on the stuck layer of the horizontal well, and the oil and water content of the stuck layer can be obtained through the liquid discharge from the wellhead of the outlet tank; After the electric-controlled time-delay packer is set and reaches the stuck layer test time, the electric control automatically releases the pressure to balance, and then lifts up to release the two stuck layer packers; After confirming that the two packers in the tubing string have been completely unsealed, the coiled tubing tool string is pulled out to complete the construction process of the coiled tubing stuck layer test.

7. The cableless coiled tubing stuck layer testing process according to claim 6 is characterized by: The stuck layer test process requires the use of continuous tubing for sand flushing, well clearance, scraping and well washing operations before starting.

8. The cableless coiled tubing stuck layer testing process according to claim 6 is characterized by: The method to open the pressure-controlled switch valve is: pressurize the casing of the cement truck, open the pressure-controlled switch valve, and observe the overflow at the wellhead through the outlet tank to verify whether the pressure-controlled switch valve is open. If there is overflow display and the overflow is continuous and stable, it means that the pressure-controlled switch valve is in good opening condition.

Images