Infinite stage fracturing sliding sleeve intelligent opening device

Abstract

The utility model discloses an intelligent opening device for an infinite fracturing sliding sleeve. The intelligent opening device is composed of a device body. The device comprises a sealing mechanism, a signal identification mechanism, an execution mechanism, a locking mechanism, a battery pack and a shell. A sealing mechanism, a locking mechanism, a signal identification mechanism and an execution mechanism are arranged in the shell; the signal identification mechanism is used for identifying a fracturing sliding sleeve label signal and starting the execution mechanism according to the identification signal; the actuating mechanism controls the locking mechanism to act according to the received identification signal so as to open the sliding sleeve; the battery pack is used for supplying power to the signal identification mechanism and the execution mechanism; the sliding sleeve is opened efficiently, accurately and safely, and the technical problems that in the long horizontal section construction process, the sliding sleeve opening efficiency is low, the task is heavy, and the construction displacement scale is small are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of casing cementing fracturing, and in particular relates to an intelligent opening device for an infinite-stage fracturing sliding sleeve. Background Art

[0002] With the increasing demand for oil and gas in social industry and people's livelihood, oil and gas companies have begun to develop tight oil and gas and shale oil and gas with poor physical properties. Conventional production and production increase methods cannot achieve recovery effects in tight oil and gas layers and shale oil and gas layers. In order to improve the recovery rate of this type of production layer and reduce production costs, this type of well type mostly uses horizontal wells to increase the oil and gas contact area. In order to increase production, this type of well type mostly uses fracturing technology to transform the formation to increase production. In order to protect the first casing from being damaged, the bridge plug perforation joint fracturing tool is replaced by the cementing fracturing sleeve. The cementing fracturing sleeve currently uses a mechanical opening method. For longer horizontal sections, the mechanical opening tool cannot be lowered into place. In order to use cementing fracturing sleeve fracturing tools in long horizontal sections, the opening tool of the cementing fracturing sleeve is the main topic that needs to be studied at present. At present, the method of opening the fracturing sleeve by throwing a mechanical dart is affected by the fracturing layer section, which cannot meet the construction of many layers and there are sleeve opening errors during the sleeve opening process, resulting in the phenomenon that some layers cannot be fractured, reducing the fracturing effect. In the prior art, a reliable, intelligent and safe sleeve opening tool is urgently needed to realize the fracturing construction of multi-stage sleeves in long horizontal sections, which is an urgent technical problem to be solved by technicians in this field. Utility Model Content

[0003] In view of the application of the above-mentioned current technologies, the utility model provides an unlimited-stage fracturing sleeve intelligent opening device, which effectively solves the safety and accuracy requirements of existing long horizontal sections using fracturing sleeves for fracturing construction, protects the integrity of the fracturing wellbore, and at the same time realizes the requirement of unlimited number of sleeves to be lowered into the long horizontal section, while improving the fracturing layer section, realizing refined fracturing and improving production efficiency.

[0004] The utility model is implemented by the following technical solutions:

[0005] An infinite-stage fracturing sleeve intelligent opening device, consisting of a device body; the device includes a sealing mechanism, a signal recognition mechanism, an actuator, a locking mechanism, a battery pack and a shell; the shell is provided with a sealing mechanism, a locking mechanism, a signal recognition mechanism and an actuator; the signal recognition mechanism is used to recognize a fracturing sleeve tag signal and start the actuator according to the recognition signal; the actuator controls the locking mechanism to open the sleeve according to the received recognition signal; the battery pack is used to provide power to the signal recognition mechanism and the actuator; wherein:

[0006] The housing is composed of a sealing nipple, a locking body and a lower joint. One end of the locking body is threadedly connected to the sealing nipple through a thread, and the other end of the locking body is threadedly connected to the lower joint. The sealing nipple is composed of a vulcanized step, a guide groove and a screw hole.

[0007] The locking mechanism is composed of an upper sealing body, an upper disc spring, an upper cone, a locking block, a locking shaft, a lower cone, a lower disc spring and a lower sealing body; the locking shaft is composed of a locking claw, a sealing groove and a rotary joint; the two ends of the rotary joint are provided with sealing grooves; the rotary joint is axially provided with a locking claw; the locking block is provided with a cone support step, a positioning support surface, a positioning step, a locking groove and a release groove; the locking shaft is engaged with the locking groove of the locking block through the locking claw, and the locking block is fixed in the locking body groove;

[0008] The sealing mechanism is composed of a support head, a rubber cup, a first sleeve, a shear pin, a linkage pin and a disc spring. The support head is fixedly connected to the screw hole of the sealing nipple through the shear pin; the support head is connected to the first sleeve through the linkage pin, and the linkage pin passes through the guide groove to connect the support head to the first sleeve; the disc spring is sleeved on the sealing nipple; the rubber cup is connected to the vulcanized step arranged on the sealing nipple through the vulcanized layer;

[0009] The signal recognition mechanism is composed of an antenna and a receiver, the antenna is arranged in a groove on the outer surface of the lower joint, and the receiver communicates with the antenna through a connecting line;

[0010] The execution mechanism is composed of a programmable controller and an execution unit.

[0011] Furthermore, the lower joint is provided with a second sheath; the second sheath is composed of a first spring part, a second spring part and a sealing lip; the first spring part is connected to the second spring part at both ends; the second spring part is connected to the sealing lip at both ends; the second sheath is U-shaped; the second sheath is made of rubber. Furthermore, the actuator controls the locking mechanism to realize the opening process of the sliding sleeve according to the received identification signal; including:

[0012] The programmable controller identifies the received tag signal. When the received signal is consistent with the programming signal, the programmable controller connects the battery pack with the execution unit. The execution unit drives the locking shaft to rotate. The upper disc spring and the lower disc spring push the upper cone and the lower cone to push the locking block out. The locking shaft rotates the locking claw to disengage the locking groove and enter the release groove. The locking block extends from the groove of the locking body, and the positioning step is locked on the switch sleeve of the sliding sleeve.

[0013] When the locking block reaches the switch sleeve position, the inner hole step of the switch sleeve is locked with the positioning step. At this time, the upper cone is supported on the support step and the positioning support surface, and the lower cone is supported on the support step and the positioning support surface; the support head is pressed downward to cut off the shear pin connecting the support head and the sealing short section, and the support head drives the first sleeve downward through the linkage pin, and the rubber cup is sealed on the switch sleeve of the sliding sleeve, so as to realize the connection between the inside and outside of the sliding sleeve, open the fracturing channel, and realize the formation fracturing operation.

[0014] Furthermore, the housing, the sealing mechanism and the locking mechanism are all made of soluble metal materials.

[0015] Beneficial Effects

[0016] 1. The utility model transmits RFID radio frequency signals, and a tag is prefabricated in the sliding sleeve. An antenna is provided on the metal outer surface of the opening tool, and the antenna part is sealed by soluble rubber to prevent the antenna from being damaged by contact with water.

[0017] 2. The utility model can realize the opening and fracturing of the sliding sleeve by inserting an opening tool at the wellhead without the need for a continuous tubing vehicle, a cable winch, etc., during fracturing construction, thereby saving construction costs and improving construction efficiency.

[0018] 3. In the utility model, the length of the locking block is greater than the gap at the connection of the casing coupling to avoid accidental locking of the opening tool. The locking block is locked with a J-shaped groove structure, and the locking block can be released by rotating the locking shaft.

[0019] 4. The metal material and the sealing rubber material in the utility model are all made of water-soluble materials. After the construction is completed, more than 90% of the volume of the material of the opening tool is dissolved in water, which does not affect the subsequent production and well repair operations.

[0020] 5. The utility model is designed with one or more antennas, which can simultaneously identify the tag signal on the sleeve, improve the recognition rate of the sleeve opening tool, and improve the success rate of opening and fracturing the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is a schematic diagram of the structure of an intelligent opening device for an infinite-stage fracturing sleeve.

[0022] Figure 2 This is a schematic diagram of the structure of a sealing nipple in an unlimited-stage fracturing sleeve intelligent opening device of the utility model;

[0023] Figure 3 This is a schematic diagram of the locking block structure in an infinite-stage fracturing sleeve intelligent opening device of the utility model;

[0024] Figure 4This is a schematic diagram of the locking shaft structure in an infinite-stage fracturing sleeve intelligent opening device of the utility model;

[0025] Figure 5 It is a schematic diagram of the second sleeve structure mechanism in an infinite-stage fracturing sleeve intelligent opening device of the utility model.

[0026] Reference numerals

[0027] 1 support head; 2 rubber cup; 3 first sleeve; 4 shear pin; 5 linkage pin; 6 disc spring; 7 sealing short section; 8 locking body; 9 upper sealing body; 10 upper disc spring; 11 upper cone; 12 locking block; 13 locking shaft; 14 lower cone; 15 lower disc spring; 16 lower sealing body; 17 lower joint; 18 second sleeve; 19 antenna; 20 receiver; 21 programmable controller; 22 execution unit; 23 battery pack; 13-1 locking claw; 13-2 sealing groove; 13-3 sealing groove; 13-4 rotary joint; the locking block 12-1 support step; support step 12-2; positioning support surface 12-3; positioning step 12-4; locking groove 12-5; release groove 12-6; 18, second sleeve; 18-1 first spring part; 18-2 second spring part; 18-3 sealing lip DETAILED DESCRIPTION

[0028] Combined with Figure 1-5 The technical solution of the utility model is further explained.

[0029] like Figure 1 As shown, the utility model provides an infinite-step sliding sleeve opening device, which is composed of a device body; the infinite-step sliding sleeve opening device includes a sealing mechanism, a signal recognition mechanism, an actuator, a locking mechanism and a housing;

[0030] The housing is composed of a sealing nipple 7, a locking body 8 and a lower joint 17. One end of the locking body 8 is threadedly connected to the sealing nipple 7 through a thread, and the other end of the locking body 8 is threadedly connected to the lower joint 17; the sealing nipple 7 is composed of a vulcanized step 7-1, a guide groove 7-2 and a screw hole 7-3; Figure 2 shown.

[0031] The sealing mechanism consists of a support head 1, a rubber cup 2, a first sleeve 3, a shear pin 4, a linkage pin 5 and a disc spring 6, wherein: the support head 1 is fixedly connected to the screw hole of the sealing short section 7 through the shear pin; the support head 1 is connected to the first sleeve 3 through the linkage pin 5, and the linkage pin 5 passes through the guide groove 7-2 to connect the support head 1 with the first sleeve 3; the disc spring is sleeved on the sealing short section 7; the rubber cup 2 is connected to the vulcanization step set on the sealing short section 7 through vulcanization; the first sleeve 3 in the utility model compresses the outer diameter of the rubber cup 2 to be smaller than the outer diameter of the first sleeve 3 through the disc spring 6 and the shear pin 4, and the rubber cup 2 and the sealing short section 7 are bonded together by vulcanization. In the utility model, the support head 1 and the first sleeve 3 are connected by the linkage pin 5, so that the support head 1 and the first sleeve 3 are linked to each other, and are used to expand the rubber cup 2 and seal it with the casing wall; the support head 1 and the sealing short section 7 are slidably sealed, so that the opening device can completely seal the casing, which is convenient for fracturing operations in the layers above the opening tool, and at the same time ensures that the liquid and gravel of the fracturing layer enter the target layer, and does not cause the fracturing liquid to enter the fractured layer, thereby improving the fracturing efficiency.

[0032] The locking mechanism is composed of an upper sealing body 9, an upper disc spring 10, an upper cone 11, a locking block 12, a locking shaft 13, a lower cone 14, a lower disc spring 15 and a lower sealing body 16. The upper sealing body 9 and the lower sealing body 16 are respectively fixedly connected to the locking body 8; a locking shaft 13 is arranged between the upper sealing body 9 and the lower sealing body 16; the locking shaft 13 is composed of a locking claw 13-1, a sealing groove (13-2, 13-3) and a rotary joint 13-4, as shown in FIG. Figure 3 As shown; the rotary joint 13-4 is provided with sealing grooves (13-2, 13-3) at both ends; the rotary joint 13-4 is provided with a locking claw 13-1 in the axial direction; Figure 4 As shown, the locking block 12 is provided with conical supporting steps 12-1, 12-2, a positioning supporting surface 12-3, a positioning step 12-4, a locking groove 12-5 and a release groove 12-6; the locking shaft 13 is engaged with the locking groove 12-5 of the locking block 12 through the locking claw 13-1 to form a J-shaped structure, and the locking block 12 is fixed in the groove of the locking body 8.

[0033] The signal recognition mechanism is composed of an antenna 19, a receiver 20 and a battery pack 23. The antenna 19 is arranged in a groove on the outer surface of the lower connector 17 and communicates with the receiver 20 through a connecting line. The receiver 20 and the battery pack 23 are sealed and protected in the shell. The antenna 19 of the utility model is arranged on the outer circle of the lower connector 17, and a second sheath made of rubber waterproof is arranged on the outer circle of the lower connector 17; the second sheath 18 is used for waterproof protection, and the second sheath 18 is U-shaped. The U-shaped second sheath 18 is composed of Figure 4 As shown, the second sheath is composed of a first spring portion 18-1, a second spring portion 18-2 and a sealing lip 18-3; both ends of the first spring portion 18-1 are connected to the second spring portion 18-2 respectively; both ends of the second spring portion 18-2 are connected to the sealing lip 18-3;

[0034] In the present invention, the second sheath 18 is added with a bottom spring 18-1 and an outer spring 18-2 during the vulcanization process, which can protect the rubber strength during the process of the opening tool entering the well, prevent damage during the friction with the casing, and cause damage to the electrical components caused by contact with water. The interference design of the sealing lip 18-3 realizes automatic sealing after the lower joint 17 is threadedly connected with the locking body 8, ensuring the safety of the electrical components.

[0035] The antenna 19 can instantly identify the tag on the sliding sleeve when it is in the sliding sleeve, and transmit the information on the tag to the programmable controller 21 through the receiver 20 for signal recognition; the signal recognition mechanism and the actuator share a battery pack 23, and the programmable controller 21 and the actuator 22 are sealed and protected in the housing;

[0036] The second sheath 18 is made of rubber material, and the signal can penetrate the rubber material. The second sheath 18 is wrapped around the lower joint 17. The threaded connection between the lower joint 17 and the locking body 8 is provided with an antenna 19, a receiver 20, a battery pack 23, a programmable controller 21 and an execution unit 22. The sealed parts are all electrical components and cannot be immersed in water.

[0037] The programmable controller 21, the execution unit 22 and the battery pack 23 form an execution mechanism. The tag signal received by the receiver 20 is transmitted to the programmable controller 21. The programmable control device 21 compares the received tag signal with the programmed signal. When the received signal is consistent with the programmed signal, the programmable controller 21 connects the battery pack 23 and the execution unit 22. At this time, the execution unit 22 drives the locking shaft 13 to rotate, and the locking shaft 13 rotates the locking claw 13-1 to disengage the locking groove 12-5 and enter the release groove 12-6, and the upper disc spring The upper cone 11 and the lower cone 14 are pushed out of the locking block 12 by the action of the locking body 8 and the lower disc spring 15, and the locking block 12 extends out of the groove of the locking body 8, and the positioning step 12-4 is locked on the switch sleeve of the sliding sleeve; when the locking block 12 reaches the switch sleeve position, the inner hole step of the switch sleeve and the positioning step 12-4 are locked, at this time, the upper cone 11 is supported on the support step 12-1 and the positioning support surface 12-3, and the lower cone 14 is supported on the support step 12-2 and the positioning support surface 12-3, and the cylindrical surface support is adopted, and the locking block is locked reliably;

[0038] The opening device is locked on the switch sleeve of the sliding sleeve, and the upper pressure fluid of the opening device forms a pressure difference between the upper and lower parts of the opening device. The support head 1 is pressed downward to cut off the shear pin connecting the support head 1 and the sealing short section 7. The support head 1 drives the first sleeve downward through the linkage pin 5, and the outer diameter restriction of the rubber cup 2 is released. The rubber cup 2 is sealed on the switch sleeve of the sliding sleeve. At this time, the opening device seals the inside of the sliding sleeve, and the opening device is pushed by pressure to move the switch sleeve of the sliding sleeve downward to open the sliding sleeve, thereby realizing the connection between the inside and outside of the sliding sleeve, opening the fracturing channel, and realizing the formation fracturing operation.

[0039] The implementation process of this utility model:

[0040] An intelligent opening device for infinite-stage fracturing sleeve is used in infinite-stage fracturing construction. An opening tool is put into the casing and sent in at a high displacement to open the sleeve, thereby increasing the displacement of fracturing construction, thereby improving the efficiency of fracturing construction and the production effect after fracturing. The following steps are included:

[0041] 1) In the utility model, the infinite-stage fracturing sleeve is lowered along with the casing or the packer. During the lowering process, the number of the sleeve corresponds to the information of the smart tag in the sleeve and is clearly recorded, so as to ensure the accuracy of the opening tool when opening the sleeve. The sleeve farthest from the wellhead is opened by pressure difference, which is convenient for connecting with the formation and sending the smart sleeve opening tool during fracturing construction.

[0042] Tools; After the infinite-stage sliding sleeve is put into place with the casing or packer, the layered packer is set or the casing cementing is realized by layering; 2) The cementing string tools are inserted from bottom to top: the floating shoe is connected with the hoop, cementing casing, toe end sliding sleeve, cementing casing, infinite-stage sliding sleeve, etc.

[0043] The limited-stage sliding sleeve, cementing casing, infinite-stage sliding sleeve, cementing casing, and infinite-stage sliding sleeve are connected to the wellhead through the cementing casing; after each sliding sleeve is lowered to the designed position, the slurry replacement begins, cement is injected into the casing, and cement is driven into the annular space between the casing, sliding sleeve and the wellbore from the casing float shoe. After a certain amount of cement is driven in, the rubber plug is thrown to clean the cement on the inner wall of the casing and sliding sleeve, and the rubber plug is pushed to the bottom of the floating shoe for impact pressure, and the cement is waited for to solidify. The fracturing wellhead is installed and the fracturing construction equipment is replaced; the toe sliding sleeve at the bottom layer is opened by pressurizing the wellhead, and the most complete wellbore fracturing is carried out to open the connecting channel with the formation;

[0044] 3) After the bottom layer of the infinite-stage fracturing sleeve is fracturing, the programmable controller 21 is programmed according to the tag code of the infinite-stage fracturing sleeve before the opening tool is put into the well. The opening tool will pass through multiple infinite-stage sleeves during the feeding process. The opening tool captures the smart tag signal on each sleeve in real time. Since the smart tag signal above the target infinite-stage sleeve is inconsistent with the signal set by the opening tool, the opening tool will not act. The receiver 20 in the opening tool recognizes the sleeve tag code and the programmable controller 21 through the antenna 19. When the object code set in the programmable controller 21 is consistent, the programmable controller 21 controls the battery pack 23 to energize the execution unit 22, so that the execution unit 22 rotates the locking shaft 13, and the locking shaft 13 rotates the locking claw 13-1 to disengage the locking groove 12-5 and enter the release groove 12-6, and the locking block 12 extends from the groove of the locking body 8, and the positioning step 12-4 is locked on the switch sleeve of the sliding sleeve; when the locking block 12 reaches the switch sleeve position, the inner hole step of the switch sleeve is locked with the positioning step 12-4, and the upper cone 11 is supported on the supporting step

[0045] 12-1 and the positioning support surface 12-3, the lower cone 14 is supported on the support step 12-2 and the positioning support surface 12-3, and the locking tool is locked on the infinite-stage fracturing sliding sleeve;

[0046] 4) After the locking is completed, after the opening tool of the utility model is positioned on the switch sleeve of the sliding sleeve, the upper pressure fluid pushes the support head 1 downward, generating an increased pressure difference between the upper and lower parts of the support head 1, shearing the shear pin 4, and driving the disc spring 6 of the first sleeve 3 downward at the same time. At this time, the rubber cup 2 naturally restores the large outer diameter to achieve a seal with the inner diameter of the switch sleeve of the sliding sleeve. The pressure on the opening tool pushes the opening tool to drive the switch sleeve downward to open the sliding sleeve. After the sliding sleeve is opened, the formation cracks are opened by the pressure liquid to perform a large-volume fracturing operation in the entire wellbore;

[0047] 5) After the operation is completed, the programmed opening tool is put into operation according to the label code of the sliding sleeve, and the pressure is opened from the farthest end from the wellhead.

[0048] Fracturing is carried out in sequence toward the near end of the wellhead until all the infinite-stage sliding sleeves in the design are opened and fracturing is completed;

[0049] 6) After all layers are fracturing, the shell, locking mechanism, sealing mechanism, rubber cup and second sheath in the opening device will be dissolved in the liquid in the well, realizing a full-diameter infinite-stage sliding sleeve, which is convenient for the subsequent closing of the sliding sleeve or re-fracturing operation.

[0050] It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and these are all within the scope of protection of the utility model. Therefore, the scope of protection of the utility model patent shall be based on the attached claims.

Claims

1. An infinite-stage fracturing sleeve intelligent opening device, consisting of a device body; characterized in that: The device comprises a sealing mechanism, a signal recognition mechanism, an actuator, a locking mechanism, a battery pack and a housing; the sealing mechanism, the locking mechanism, the signal recognition mechanism and the actuator are arranged in the housing; the signal recognition mechanism is used to recognize the fracturing sleeve tag signal and start the actuator according to the recognition signal; the actuator controls the locking mechanism to open the sleeve according to the received recognition signal; the battery pack is used to provide power to the signal recognition mechanism and the actuator; wherein: The housing is composed of a sealing nipple, a locking body and a lower joint. One end of the locking body is threadedly connected to the sealing nipple through a thread, and the other end of the locking body is threadedly connected to the lower joint. The sealing nipple is composed of a vulcanized step, a guide groove and a screw hole. The locking mechanism is composed of an upper sealing body, an upper disc spring, an upper cone, a locking block, a locking shaft, a lower cone, a lower disc spring and a lower sealing body; the locking shaft is composed of a locking claw, a sealing groove and a rotary joint; the two ends of the rotary joint are provided with sealing grooves; the rotary joint is axially provided with a locking claw; the locking block is provided with a cone support step, a positioning support surface, a positioning step, a locking groove and a release groove; the locking shaft is engaged with the locking groove of the locking block through the locking claw, and the locking block is fixed in the locking body groove; The sealing mechanism is composed of a support head, a rubber cup, a first sleeve, a shear pin, a linkage pin and a disc spring. The support head is fixedly connected to the screw hole of the sealing nipple through the shear pin; the support head is connected to the first sleeve through the linkage pin, and the linkage pin passes through the guide groove to connect the support head with the first sleeve; the disc spring is sleeved on the sealing nipple; the rubber cup is connected to the vulcanization step set on the sealing nipple through vulcanization; The signal recognition mechanism is composed of an antenna and a receiver, the antenna is arranged in a groove on the outer surface of the lower joint, and the receiver communicates with the antenna through a connecting line; The execution mechanism is composed of a programmable controller and an execution unit.

2. According to claim 1, the infinite-stage fracturing sleeve intelligent opening device is characterized by: The lower joint is provided with a second sheath; the second sheath is composed of a first spring part, a second spring part and a sealing lip; the two ends of the first spring part are respectively connected to the second spring part; the two ends of the second spring part are connected to the sealing lip; the second sheath is U-shaped; The second sheath is made of rubber material.

3. An infinite-stage fracturing sleeve intelligent opening device according to any one of claims 1-2, characterized in that: The shell, the sealing mechanism and the locking mechanism are all made of soluble metal materials.

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