Intelligent fracturing sliding sleeve system and implementation method

Abstract

The invention relates to the technical field of fracturing sliding sleeve systems, in particular to an intelligent fracturing sliding sleeve system and an implementation method. The label key is expanded, clamped and sealed in the same sliding sleeve, so that the movement distance of the label in a shaft after the label is expanded is reduced, and the risk that the label key is clamped in the pumping process can be effectively reduced. The diameter of the label key is far smaller than the inner diameter of the shaft, and the risk that the sliding sleeve cannot be opened due to improper pumping of the label key caused by shaft deformation or shaft sundry deposition can be greatly reduced. The sliding sleeve integrated sensor and the control module of the sliding sleeve integrated sensor can monitor underground fracturing parameters in real time, monitored data can be read through a data backward-reading technology, and effective data support is provided for fracturing operation of a whole well. A ground monitoring system is matched to monitor the pressure change of label key pumping through the sliding sleeve, the label key pumping position is accurately determined in real time, and a parameter basis is provided for technicians to confirm opening of the target sliding sleeve.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing sleeve systems, and more particularly to an intelligent fracturing sleeve system and an implementation method thereof. Background Art

[0002] As the number of medium and high permeability oil and gas fields being developed in my country decreases, the number of tight rock formation oil fields increases. Therefore, fracturing is an important technical measure to increase the production of oil and gas wells, and is one of the effective means to transform and unblock tight rock formations and low permeability oil layers. Therefore, the infinite-stage fracturing sleeve technology is proposed. The infinite-stage fracturing sleeve segmented pressure technology does not require perforation and packer layer blocking, shortens the operation time, reduces costs, improves the degree of reservoir utilization, and achieves the goal of economical and efficient development. At present, the domestic infinite-stage fracturing sleeve technology uses opening tool balls, darts, etc., which are not suitable for casing deformation wells and are prone to encounter obstacles during pumping. It is impossible to open the sleeve of the target layer section, and it is impossible to determine the position of the opening tool. Once a problem occurs, it will cause a great obstruction to further construction. Summary of the invention

[0003] The present invention provides an intelligent fracturing sleeve system and an implementation method, which aims to solve the problem that the casing is deformed due to formation pressure, causing tag-type or ball-type tools to be unable to be pumped into place.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A label key comprises a central tube, which is provided with a pressure-transmitting hole, characterized in that a sealing cover is fixedly connected to the right end of the central tube, a push sleeve is sleeved and slidably connected to the central tube, a first clamp is clamped on the push sleeve and the sealing cover, a push sleeve protrusion is fixedly connected to the inner wall of the push sleeve, a right cavity is formed between the central tube, the sealing cover, the push sleeve and the push sleeve protrusion, an execution module is arranged in the right cavity, the execution module can block and open the pressure-transmitting hole, an expansion piece is sleeved and slidably connected to the central tube, the expansion piece at the left end of the push sleeve is fixedly connected, a left cavity is formed between the central tube, the push sleeve, the push sleeve protrusion and the expansion piece, an isolation ring is fixedly connected to the central tube, the isolation ring is located in the left cavity, the push sleeve is sleeved and slidably connected to the isolation ring, the right part of the cone sleeve is fixedly connected to the central tube, a retaining ring is sleeved and fixedly connected to the expansion piece, a sealing installation groove is formed between the retaining ring and the expansion piece, a sealing piece located in the sealing installation groove is sleeved on the expansion piece, and a reduced diameter section is arranged on the right part of the inner wall of the sealing cover.

[0006] A tapered sleeve inclined surface with a diameter gradually increasing from right to left is formed on the outer wall of the tapered sleeve, and the inner wall surface of the fork piece is in surface contact with the tapered sleeve inclined surface. Teeth evenly distributed around the circumference are integrally formed on the outer wall of the right part of the tapered sleeve, and a tooth mounting groove is formed between any two adjacent fork pieces. The number of tooth mounting grooves is the same as the number of teeth, so that a tooth is inserted into each tooth mounting groove, and the tooth mounting groove limits the circumferential freedom of the tooth.

[0007] A threaded hole is arranged on each tooth, and a through hole communicating with the threaded hole is arranged on the retaining ring. The retaining ring is fixed on the tooth by firstly passing a bolt through the through hole and then screwing into the threaded hole.

[0008] The central tube and the cover form a central channel, and a fracturing ball can pass through the central tube. The fracturing ball can be stuck at the entrance of the reduced diameter section of the cover to block the central channel.

[0009] The right part of the cover is fixedly connected with a righting spring sheet, which has a rib structure which is evenly distributed around the circumference and expands radially outwards, and a slit is formed between any two adjacent ribs.

[0010] The sealing member is a rubber sealing ring, or the sealing member includes a metal sealing ring and an open ring fixed to the left end of the metal sealing ring.

[0011] A fracturing sleeve, used in conjunction with the above-mentioned tag key, comprises a sleeve body, a flow channel and a signal module are arranged on the sleeve body, a sleeve inner core is arranged in the sleeve body, and the sleeve body and the sleeve inner core are clamped by a second clamp;

[0012] The tag key also includes a control module. When the tag key passes through the fracturing sleeve, the signal module is identified. When the target sleeve is identified, the control module can control the execution module to open the pressure-through hole.

[0013] When the push sleeve pushes the rubber sealing ring to the left, it expands radially under the action of the push sleeve and the retaining ring, so that the rubber sealing ring can seal the inner core of the sliding sleeve;

[0014] When the push sleeve pushes the metal sealing ring to the left, the metal sealing ring moves along the conical surface of the expansion piece, and the metal sealing ring expands radially under the action of the push sleeve and the conical surface, so that the metal sealing ring can seal the inner core of the sliding sleeve.

[0015] A signal module and a storage module are arranged in the sealed cavity of the electrical cavity. A wire tube installation hole and a capture port are arranged on the sliding sleeve body and are located on the left side of the sealed cavity of the electrical cavity. The capture port is located on the left side of the wire tube installation hole. The sealed cavity of the electrical cavity, the wire tube installation hole and the capture port are connected. A plug is installed in the wire tube installation hole to close the wire tube installation hole.

[0016] A process for monitoring the number of tag keys passing through a sliding sleeve on the ground, using the tag key, a right-centering spring piece is fixedly connected to the right part of the cover, and the right-centering spring piece has a rib structure that is evenly distributed around the circumference and expands radially outward;

[0017] The righting spring piece will be stuck at the reduced diameter of the sleeve inner core when passing through it. The right end of the righting spring piece has a conical surface, so that when the pressure of the pump truck is increased, it will be subjected to the radial component of force in the axial direction applied by the sleeve inner core, causing radial contraction and passing through the sleeve inner core. The increased pressure value will be monitored by the pressure sensor integrated on the ground inlet or pressure manifold.

[0018] A method for monitoring fracturing parameters, wherein a coiled tubing is used to carry a special fishing tool and put into a wellbore. When the fishing tool is read to a target layer, a manipulator of the fishing tool retrieves the plug and a storage module fixed to the plug. At this time, the top ring of the coiled tubing is lifted and retreated, and a spring is further compressed, so that the plug and the storage module arranged therein are separated from the installation position. At this time, the manipulator of the fishing tool can be retracted with the plug and the storage module arranged therein, and the top ring is reset under the action of the spring.

[0019] A wireless communication reading salvage tool is placed in the wellbore by using a cable pipe, conventional oil pipe or continuous oil pipe combined with an inner cable. When the salvage tool reaches the target layer, it can read the signal transmitted by the signal module, analyze the parameters and transmit the parameters of the fracturing layer to the ground in real time through the pre-installed cable in the cable pipe for layer segment fracturing parameter analysis. After the data is read, the cable pipe carries the salvage tool out of the well to complete the data readback.

[0020] A method for closing a fracturing sleeve comprises using the above-mentioned fracturing sleeve and lowering the sleeve into a wellbore using a coiled tubing with a label key. After a seal is locked in an inner core of the sleeve, the coiled tubing with a label key is dragged to the left, and the seal drives the inner core of the sleeve to close a flow channel opening. After the flow channel opening is closed, the locking elastic ring is re-embedded in an annular groove on the left side of the inner wall of the sleeve shell, thereby realizing the re-closing of the fracturing sleeve.

[0021] In fact, as needed, online reading or salvaging of storage chips can be flexibly performed to obtain production process data, for example, after the completion of fracturing construction and in the later production stage.

[0022] The beneficial effects of the intelligent fracturing sleeve system and implementation method of the present invention are:

[0023] The expansion, locking and sealing action of the tag key in the same sleeve reduces the movement distance of the tag in the wellbore after expansion, which can effectively reduce the risk of the tag key getting stuck during the pumping process.

[0024] The diameter of the tag key is much smaller than the inner diameter of the wellbore, which can greatly reduce the risk of the tag key failing to pump into place and unable to open the sliding sleeve due to wellbore deformation or debris deposition in the wellbore. Taking 5.5in casing as an example, the conventional inner diameter of the casing is 114mm~121mm. When the casing is deformed or broken, it can generally be equipped with smart tags of different specifications with diameters of 72mm~98mm to meet the passability of the sleeve change position. According to the proportion conversion, the outer diameter of the smart tag that can generally be matched is 60%~85% of the inner diameter of the casing.

[0025] The sliding sleeve integrated sensor and its control module can monitor downhole fracturing parameters in real time, read the monitoring data through a data readback process, and provide effective data support for the fracturing operation of the entire well.

[0026] A matching ground monitoring system is provided to monitor the pressure changes of the tag key when it is pumped through the sleeve, and accurately determine the pumping position of the tag key in real time, providing parameter basis for technicians to confirm the opening of the target sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a rubber seal tag key is shown;

[0028] Figure 2 A schematic diagram showing the expansion of the seal of a rubber seal tag key;

[0029] Figure 3 A schematic diagram of a key using a metal seal tag is shown;

[0030] Figure 4 A schematic diagram showing the expansion of a seal using a metal seal tag key;

[0031] Figure 5 A schematic diagram of an expansion member is shown;

[0032] Figure 6 A schematic diagram of the drogue is shown;

[0033] Figure 7 A schematic diagram showing the cooperation between the expansion piece and the cone sleeve;

[0034] Figure 8 A schematic diagram showing the cooperation of the expansion member, the cone sleeve and the retaining ring;

[0035] Fig. 9 A schematic diagram of a fracturing sleeve is shown;

[0036] Fig.10 yes Fig. 9 A partial enlarged view of

[0037] Fig.11 A partial schematic diagram of a fracturing sleeve is shown;

[0038] Fig.12 A schematic diagram of the occlusion is shown;

[0039] Figures 13 to 15 A diagram showing the process of opening the fracturing sleeve with a key tag;

[0040] Fig.16 A schematic diagram showing wireless communication reading data;

[0041] Fig.17 A schematic diagram of a salvaged storage module is shown;

[0042] Fig.18 A side view of the expansion member is shown;

[0043] Fig.19 A piping diagram of a smart fracturing sliding sleeve system is shown;

[0044] Fig. 20 The monitoring signal readback logic diagram is shown;

[0045] Fig.21 The logic diagram of the tag key detection signal is shown;

[0046] Fig. 22 A schematic diagram showing the initial state when the fracturing sleeve is reclosed.

[0047] In the figure: 101, central tube; 101a, pressure-through hole; 102, cover; 103, push sleeve; 104, first retainer; 105a, control module; 105b, execution module; 105c, battery; 106, expansion member; 106a, fork member; 106b, retaining block; 107, isolation ring; 108, cone sleeve; 108a, tooth; 109, retaining ring; 110, sealing member; 110a, metal sealing ring; 110b, open ring; 111, fracturing ball; 112, righting spring; 201 , sleeve housing; 201a, flow channel; 201b, battery; 201c, detection control module; 201d, sensor; 201e, signal module; 201f, storage module; 202, electrical cavity housing; 202a, wire tube; 202b, plugging; 202c, top ring; 202d, spring; 202e, capture port; 203, upper joint; 204, sleeve inner core; 204a, retaining spring ring; 205, second retainer; 206, lower joint; 3, salvage tool; 3a, manipulator. DETAILED DESCRIPTION

[0048] A tag key, e.g. Figures 1 to 4:Comprise center tube 101, the right side of center tube 101 is provided with pressure-through hole 101a.The outer wall of center tube 101 right part is threadedly connected with the inner wall of cover 102 left part, center tube 101 is slidably connected with push sleeve 103, push sleeve 103 is fixed with first retainer 104, first retainer 104 is fixed on the outer wall of cover 102, push sleeve 103 is integrally formed with push sleeve protrusion on the inner wall, push sleeve protrusion is slidably connected with center tube 101.Center tube 101, cover 102, push sleeve 103 and push sleeve protrusion form right side cavity, control module 105a, execution module 105b and battery 105c are provided in right side cavity.Control module 105a and execution module 105b are fixedly connected on center tube 101, for example, realize by the mode of adhesive tape or other material bundling.Execution module 105b can block pressure-through hole 101a. The battery 105c is fixed to the cover 102 by means of adhesive tape or binding, and the battery 105c supplies power to the control module 105a and the execution module 105b. The control module 105a can control the execution module 105b to block the pressure hole 101a, and the control module 105a can also control the execution module 105b to open the pressure hole 101a. The execution module 105b can be a miniature electric linear actuator or a small solenoid valve.

[0049] Further explanation, combined with Figures 5 to 8:The center tube 101 is slidably connected with an expansion member 106 by a sleeve arrangement, and the inner wall of the left part of the push sleeve 103 is threadedly connected with the outer wall of the right part of the expansion member 106. The left end of the expansion member 106 is integrally formed with a circumferentially uniformly distributed fork member 106a, and this bifurcated design is conducive to the expansion of the fork member 106a, and a locking block 106b is fixedly connected to the outer wall of the left part of the fork member 106a. A left cavity is formed between the center tube 101, the push sleeve 103, the push sleeve protrusion and the expansion member 106, and the inner wall of the isolation ring 107 is threadedly connected with the outer wall of the center tube 101. The isolation ring 107 is located in the left cavity, and the isolation ring 107 is slidably connected with the push sleeve 103. The inner wall of the right part of the cone sleeve 108 is threadedly connected with the outer wall of the left part of the center tube 101, and an inclined surface with a diameter gradually increasing from right to left is formed on the outer wall of the cone sleeve 108, which is recorded as the cone sleeve inclined surface for easy distinction. The inner wall surface of the fork piece 106a is also provided with an inclined surface, which is recorded as the fork piece inclined surface. The purpose is to achieve surface contact between the fork piece inclined surface and the tapered sleeve inclined surface. Teeth 108a uniformly distributed around the circumference are integrally formed on the outer wall of the right part of the tapered sleeve 108. A tooth mounting groove is formed between any two adjacent fork pieces 106a. The number of tooth mounting grooves is the same as the number of teeth 108a, so that a tooth 108a is inserted into each tooth mounting groove. The tooth mounting groove limits the circumferential freedom of the tooth 108a. A retaining ring 109 is sleeved on the expansion piece 106. Each tooth 108a is provided with a threaded hole. The retaining ring 109 is provided with a through hole connected to the threaded hole. The retaining ring 109 is fixed to the tooth 108a by first passing a bolt through the through hole and then screwing it into the threaded hole. A seal installation groove is formed between the retaining ring 109 and the expansion member 106, and the seal 110 is sleeved on the expansion member 106 and located in the seal installation groove to abut against the radial walls of the retaining ring 109 and the expansion member 106. The central tube 101 and the cover 102 form a central channel, and a reduced diameter section is provided on the right part of the inner wall of the cover 102. The central tube 101 can pass through the fracturing ball 111, and the fracturing ball 111 then enters the interior of the cover 102, and the fracturing ball 111 is finally stuck at the entrance of the reduced diameter section of the cover 102 to block the central channel.

[0050] To further illustrate, the right portion of the outer wall of the cover 102 is threadedly connected to the left portion of the inner wall of the righting spring 112. The righting spring 112 has a rib structure that is evenly distributed around the circumference and expands radially outward. A slit is formed between any two adjacent ribs.

[0051] The first retainer 104 may be a conventional shear-type pin, one end of which is threadedly connected to the push sleeve 103, and the other end is inserted into the cover 102. When the push sleeve 103 has a tendency to move, the first retainer 104 is not strong enough to retain and will break. It may also be an elastic retaining mechanism, and when the elastic force is not enough to retain the cover 102, the retaining mechanism shrinks and the cover 102 is released from the retaining.

[0052] Dynamic sealing can be performed on parts that move relatively. For example, the inner wall and outer wall of the isolation ring 107 are both installed with sealing rings, the inner wall of the push sleeve is installed with a sealing ring, and the outer wall of the cover 102 is installed at the position where it keeps in contact with the push sleeve 103. Sealing rings can also be installed at fixed positions that need to be sealed, such as between the central tube 101 and the cover 102.

[0053] For example Figure 1 and 2 The seal 110 can be a rubber seal ring for sealing the wellbore, which is suitable for working conditions with small downhole pressure difference. Figure 3 And, 4, the seal 110 can also be used in the form of a metal sealing ring 110a with the right end fixedly connected to the open ring 110b to seal the wellbore, which is suitable for working conditions with large pressure differences downhole. The two types of tags are fixed with a fixing block. The two types of tags can be selected and used according to different working conditions, and the tag key return channel can be set according to the working conditions.

[0054] The open ring 110b is an annular structure, and one or more of a "V"-shaped opening, a parallel opening and a zigzag opening are arranged on the annular structure, and the opening direction faces leftward.

[0055] Preferably, the tag key has a variety of outer diameter specifications and the diameter of the tag key is much smaller than the inner diameter of the wellbore, which can greatly reduce the risk of the tag key failing to pump into place and unable to open the sleeve due to wellbore deformation or deposition of debris in the wellbore. It can ensure smooth construction when the casing is deformed, broken, etc., causing the inner diameter of the casing to be smaller than the normal size.

[0056] A fracturing sleeve, such as Fig. 9 , including a sleeve housing 201, on which flow channel openings 201a are evenly distributed around the circumference are arranged, the left side of the outer wall of the sleeve housing 201 is threadedly connected to the right part of the inner wall of the electric cavity housing 202, a sealed cavity of the electric cavity is formed between the sleeve housing 201 and the electric cavity housing 202, a battery 201b, and a detection control module 201c, a sensor 201d, a signal module 201e and a storage module 201f powered by the battery 201b are arranged in the sealed cavity of the electric cavity; the detection control module 201c is used to control the sensor 201d, the signal module 201e and the storage module 201f.

[0057] The inner end surface of the electrical cavity housing 202 is provided with a sensor installation threaded hole for threaded connection of the sensor 201d, and the electrical cavity housing 202 is provided with a liquid passage to allow the liquid in the wellbore to contact the sensor 201d.

[0058] The left inner end face of the electric cavity housing 202 is provided with a wire tube installation hole, and the wire tube 202a is inserted into the wire tube installation hole, and the wire tube installation hole is connected with the electric cavity sealed cavity. The plug 202b is inserted into the wire tube 202a and the two are threadedly connected, and the position where the plug 202b cooperates with the wire tube 202a and the position where the wire tube 202a cooperates with the electric cavity housing 202 uses a sealing ring to ensure the sealing of the electric cavity sealed cavity, and the storage module 201f is placed in the sealed cavity inside the plug 202b and the wire tube 202a.

[0059] Further explanation, combined with Fig.10 The inner wall of the left part of the electrical cavity shell 202 is threadedly connected to the outer wall of the right side of the upper joint 203, and a groove corresponding to the wire tube installation hole is formed between the electrical cavity shell 202 and the upper joint 203. A top ring 202c and a spring 202d are arranged in the groove from right to left. The top ring 202c is against the left part of the storage module 201f, and the spring 202d is in a compressed state.

[0060] A capture opening 202e is formed between the left end of the sliding sleeve housing 201 and the right end of the electrical cavity housing 203. The plug 202b is located at the capture opening 202e.

[0061] Further explained, a sleeve inner core 204 is slidably connected in the sleeve housing 201, and a reduced diameter section is provided on the inner wall on the left side of the sleeve housing 201 to form a sleeve housing shoulder. When the left end of the sleeve inner core 204 abuts against the sleeve housing shoulder, the flow channel opening 201a is blocked. A second retainer 205 is fixed to the sleeve housing 201, and the second retainer 205 is fixed in the hole of the outer wall of the sleeve inner core 204. The right part of the inner wall of the sleeve housing 201 is threadedly connected to the left part of the outer wall of the lower joint 206. When the sleeve inner core 204 moves rightward and abuts against the lower joint 206, the flow channel opening 201a is opened.

[0062] Preferably, a locking elastic ring 204a is fixedly connected to the outer wall of the inner core 204 of the sliding sleeve, the locking elastic ring 204a is convex in shape and has a groove on the side close to the axis, and the inner wall of the sliding sleeve outer shell 201 is provided with two annular grooves, one on the left and one on the right. When the inner core 204 of the sliding sleeve is located at the initial position to block the flow channel opening 201a, the locking elastic ring 204a is stuck in the annular groove on the left side. When the inner core 204 of the sliding sleeve moves to the right, the locking elastic ring 204a is deformed and recessed in the direction of the axis until the inner core 204 of the sliding sleeve rests on the lower joint 206, and the locking elastic ring 204a is stuck in the annular groove on the right side.

[0063] Preferably, the tag key is made of a fully soluble material and dissolves within a certain period of time after operation.

[0064] When working, for example Figures 13 to 15When the tag key passes through the fracturing sleeve, the control module 105a identifies the signal module 201e. When the target sleeve is identified, the control module 105a controls the execution module 105b to act. The pressure-transmitting hole 101a was originally blocked by the execution module 105b. After the execution module 105b acts, the execution module 105b no longer blocks the pressure-transmitting hole 101a. Therefore, the pressure in the wellbore enters the right cavity through the pressure-transmitting hole 101a. Since the left cavity is at standard atmospheric pressure, the pressure in the right cavity is greater than the pressure in the left cavity. The push sleeve 103 moves to the left and the first retainer 104 is no longer fixed. The push sleeve 103 pushes the seal 110 to the left. Under the action of the push sleeve 103 and the retaining ring 109, the seal 110 expands radially, so that the seal 110 can seal the inner core 204 of the sleeve. The expansion member 106 will also move to the left, and under the action of the inclined surface of the cone sleeve 108, the expansion member 106 expands radially along the inclined surface of the cone sleeve, so that the locking block 106b can slide into the inner core 204 of the sleeve. The tag key is expanded, locked and sealed in the same fracturing sleeve, which reduces the movement distance of the tag key in the wellbore after expansion, and can effectively reduce the risk of the tag key getting stuck in the pumping process.

[0065] The storage module 201f is designed to be salvageable. Fig.16 and 17 , the high-frequency data collection and activation of the fracturing process is realized through the tag key. After the construction is completed, the storage module 201f in the fracturing sleeve is salvaged by using a cable pipe, conventional oil pipe or continuous oil pipe combined with a cable in the pipe, for ground data playback. Among them, the salvage tool 3 is equipped with a manipulator 3a, so that the manipulator 3a is extended to grab the plug 202b and the storage module 201f fixed to the plug 202b.

[0066] The detection parameters of the fracturing parameters monitoring of the fracturing layer section activated by the tag key are not limited to pressure, temperature, etc. After the fracturing of the current layer section is completed, the dedicated fishing tool 3 is placed in the wellbore with a continuous tubing. When the fishing tool 3 is read to the target layer section, the fishing tool hook manipulator 3a or the hook claw extends to grab the plug 202b and the storage module 201f fixed to the plug 202b. At this time, the top ring 202c of the continuous tubing is lifted and retreated, and the spring 202d is further compressed, and the plug 202b and the storage module 201f disposed therein are separated from the installation position. At this time, the fishing tool manipulator 3a can be retracted with the plug 202b and the storage module 201f disposed therein. The top ring 202c is reset under the action of the spring 202d.

[0067] The fracturing parameters of the fracturing layer can also be activated by the tag key. The detection parameters are not limited to pressure, temperature, etc. After the fracturing of this layer is completed, the salvage tool 3 with wireless communication reading is placed in the wellbore using a cable laying tube. When the salvage tool 3 reaches the target layer, the salvage tool 3 can read the signal emitted by the signal module 201e in the sliding sleeve, analyze the parameters, and transmit the parameters of the fracturing layer to the ground fracturing command vehicle in real time through the pre-installed cable in the cable laying tube to perform layer segment fracturing parameter analysis. After the data is read, the cable laying tube carries the salvage tool 3 out of the well to complete the data readback. If the battery is out of power, the data can be read out by wireless power supply and communication.

[0068] Well fracturing process:

[0069] The fracturing sleeve is connected to the casing thread through the internal threads of the upper joint 202 and the lower joint 206 and is lowered into the ground with the casing. During the fracturing construction, the tag key is inserted from the wellhead. During the pumping process of the tag key, the pressure sensor on the ground will monitor the pumping pressure from time to time to determine the number of fracturing sleeves through which the tag key passes. At the same time, the built-in control module 105a of the tag key will automatically identify the underground sliding sleeve. When the target fracturing sleeve is detected, the tag key is locked and sealed in the inner core 204 of the sleeve. After locking, the pump truck continues to pressurize and open the fracturing sleeve for fracturing operation. After the fracturing operation of this layer section is completed, the fracturing data can be obtained by the wireless communication method described above or by salvaging the storage module. In the subsequent construction, the tag keys are inserted in sequence from the bottom to the top to perform fracturing operations and obtain fracturing data until the fracturing operation of the entire well is completed. After the fracturing construction is completed and in the later production stage, online reading or salvaging of the storage chip can also be performed to obtain production process data.

[0070] For example Fig. 22 When the fracturing sleeve needs to be closed, the coiled tubing with a label key is lowered into the wellbore. After the seal 110 locks the sleeve inner core 204, the coiled tubing with a label key is dragged to the left, and the seal 110 drives the sleeve inner core 204 to close the flow channel 201a. After the flow channel 201a is closed, the locking elastic ring 204a is re-embedded in the ring groove on the left side of the inner wall of the sleeve shell 201, so as to realize the re-closing of the fracturing sleeve.

[0071] The process method of monitoring the number of tag keys passing through the sleeve on the ground, the righting spring piece 112 is in the initial state in the fracturing sleeve during the pumping process, but it will be stuck at the reduced diameter when passing through the sleeve inner core 204. At this time, in order to allow the righting spring piece 112 to contract radially, the pump truck pressure needs to be increased, and the righting spring piece 112 can contract radially under the action of the right end cone surface and the reduced diameter of the sleeve inner core 204 to pass through the sleeve inner core 204. The increased pressure value will be monitored by the high-frequency pressure sensor integrated on the ground inlet or pressure manifold, and the ground technicians can determine whether the tag key has passed through the fracturing sleeve, and realize the positioning detection of the tag key during the pumping process.

Claims

1. A tag key, comprising a central tube (101), the central tube (101) being provided with a pressure-transmitting hole (101a), characterized in that: The right end of the central tube (101) is fixedly connected with a sealing cover (102), a push sleeve (103) is sleeved and slidably connected on the central tube (101), a first clamp (104) is clamped on the push sleeve (103) and the sealing cover (102), a push sleeve protrusion is fixedly connected on the inner wall of the push sleeve (103), a right cavity is formed among the central tube (101), the sealing cover (102), the push sleeve (103) and the push sleeve protrusion, an execution module (105b) is arranged in the right cavity, the execution module (105b) can block and open the pressure-transmitting hole (101a), an expansion member (106) is sleeved and slidably connected on the central tube (101), and the push sleeve (10 3) The left end expansion member (106) is fixedly connected, and a left cavity is formed between the central tube (101), the push sleeve (103), the push sleeve protrusion and the expansion member (106); an isolating ring (107) is fixedly connected to the central tube (101), and the isolating ring (107) is located in the left cavity; the right part of the cone sleeve (108) is fixedly connected to the central tube (101); a retaining ring (109) is sleeved and fixedly connected to the expansion member (106); a sealing member installation groove is formed between the retaining ring (109) and the expansion member (106); a sealing member (110) located in the sealing member installation groove is sleeved on the expansion member (106); and a reduced diameter section is provided on the right part of the inner wall of the cover (102).

2. According to the label key described in claim 1, a tapered sleeve inclined surface with a diameter gradually increasing from right to left is formed on the outer wall of the tapered sleeve (108), and the inner wall surface of the fork piece (106a) is in surface contact with the tapered sleeve inclined surface. The outer wall of the right part of the tapered sleeve (108) is integrally formed with circumferentially evenly distributed teeth (108a), and a tooth mounting groove is formed between any two adjacent fork pieces (106a). The number of tooth mounting grooves is the same as the number of teeth (108a), so that a tooth (108a) is inserted into each tooth mounting groove, and the tooth mounting groove limits the circumferential freedom of the tooth (108a).

3. According to the tag key described in claim 1, each tooth (108a) is provided with a threaded hole, and the retaining ring (109) is provided with a through hole connected to the threaded hole, and the retaining ring (109) is fixed to the tooth (108a) by first passing a bolt through the through hole and then screwing it into the threaded hole.

4. According to the tag key described in claim 1, the central tube (101) and the cover (102) form a central channel, and the fracturing ball (111) can pass through the central tube (101), and the fracturing ball (111) can be stuck at the entrance of the reduced diameter section of the cover (102) to block the central channel.

5. According to the tag key described in claim 1, a right-centering spring sheet (112) is fixedly connected to the right portion of the cover (102), and the right-centering spring sheet (112) has a rib structure that is evenly distributed around the circumference and expands radially outward, and a slit is formed between any two adjacent ribs.

6. According to the tag key of claim 1, the sealing member (110) is a rubber sealing ring, or the sealing member (110) comprises a metal sealing ring (110a) and an open ring (110b) fixed to the left end of the metal sealing ring (110a).

7. A fracturing sleeve, comprising a sleeve body, a flow channel (201a) and a signal module (201e) being arranged on the sleeve body, a sleeve inner core (204) being arranged in the sleeve body, and the sleeve body and the sleeve inner core (204) being fixed by a second fixing device (205); Used in conjunction with the tag key of any one of claims 1 to 6, the tag key further comprises a control module (105a), and when the tag key passes through the fracturing sleeve, the signal module (201e) is identified, and when the target sleeve is identified, the control module (105a) can control the execution module (105b) to open the pressure-through hole (101a); When the push sleeve (103) pushes the rubber sealing ring to the left, the push sleeve (103) and the retaining ring (109) expand radially, so that the rubber sealing ring can seal the inner core (204) of the sliding sleeve; When the push sleeve (103) pushes the metal sealing ring (110a) to the left, the metal sealing ring (110a) moves along the conical surface of the expansion member (106). Under the action of the push sleeve (103) and the conical surface, the metal sealing ring (110a) expands radially, so that the metal sealing ring (110a) can seal the inner core (204) of the sliding sleeve.

8. According to the fracturing sleeve of claim 7, an electric cavity sealing cavity is provided on the sleeve body, a signal module (201e) and a storage module (201f) are provided in the electric cavity sealing cavity, a wire tube mounting hole and a capture port (202e) located on the left side of the electric cavity sealing cavity are provided on the sleeve body, the capture port (202e) is located on the left side of the wire tube mounting hole, the electric cavity sealing cavity, the wire tube mounting hole and the capture port (202e) are connected, and a plug (202b) is installed in the wire tube mounting hole to close the wire tube mounting hole.

9. A process for monitoring the number of tag keys passing through a sliding sleeve on the ground, using the tag key according to claim 1, wherein a righting spring sheet (112) is fixedly connected to the right portion of the cover (102), and the righting spring sheet (112) has a rib structure that is evenly distributed around the circumference and expands radially outward; The righting spring piece (112) is stuck at the reduced diameter of the sleeve inner core (204) when passing through the sleeve inner core (204). The right end of the righting spring piece (112) has a conical surface, so that when the pressure of the pump truck is increased, it will be subjected to the radial component force applied by the sleeve inner core (204) toward the axial direction, and will be radially contracted to pass through the sleeve inner core (204). The increased pressure value will be monitored by the pressure sensor integrated on the ground inlet or the pressure manifold.

10. A method for monitoring fracturing parameters, using the fracturing sleeve according to claim 7, A dedicated salvage tool (3) is placed into the wellbore by using a coiled tubing. When the salvage tool (3) is read to the target layer, the manipulator (3a) of the salvage tool retrieves the plug (202b) and the storage module (201f) fixed to the plug (202b). At this time, the coiled tubing top ring (202c) is lifted up and retreated, the spring (202d) is further compressed, the plug (202b) and the storage module (201f) arranged therein are separated from the installation position, and the salvage tool manipulator (3a) can be retracted with the plug (202b) and the storage module (201f) arranged therein, and the top ring (202c) is reset under the action of the spring (202d).

11. The method for monitoring fracturing parameters according to claim 10, characterized in that: A wireless communication reading type salvage tool (3) is lowered into the wellbore by using a cable pipe, conventional oil pipe or continuous oil pipe combined with an inner cable. When the salvage tool (3) reaches the target layer, the salvage tool (3) can read the signal emitted by the signal module (201e), analyze the parameters and transmit the parameters of the fracturing layer to the ground in real time through the cable pre-installed in the cable pipe to perform layer segment fracturing parameter analysis. After the data is read, the cable pipe carries the salvage tool (3) out of the well to complete the data readback.

12. A method for closing a fracturing sleeve, characterized in that: The fracturing sleeve as described in claim 7 is used and lowered into the wellbore using a continuous tubing with a label key. After the seal (110) is locked in the sleeve inner core (204), the continuous tubing with a label key is dragged to the left, and the seal (110) drives the sleeve inner core (204) to close the flow channel (201a). After the flow channel (201a) is closed, the locking elastic ring (204a) is re-embedded in the annular groove on the left side of the inner wall of the sleeve shell (201), thereby realizing the re-closing of the fracturing sleeve.

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