An infinite-stage intelligent cluster sliding sleeve opening system

Abstract

The present application relates to the technical field of downhole control, and particularly relates to an unlimited level intelligent cluster sliding sleeve opening system, which comprises a cluster sliding sleeve and an opening device; the cluster sliding sleeve comprises a signal transmitting device, an intermediate sliding sleeve and a landing sliding sleeve connected in sequence, at least one intermediate sliding sleeve is arranged between the transmitting device and the landing sliding sleeve, the intermediate sliding sleeve comprises an inner sliding sleeve and an outer sliding sleeve, the inner sliding sleeve is provided with an outer-expandable spring claw structure at the end close to the landing sliding sleeve, and a limiting boss is arranged on the inner wall of the spring claw structure; when the signal receiving device receives a signal, the stop block extends from the main body and abuts against the limiting boss to push the inner sliding sleeve to move. Only the sliding sleeve section with a matched signal can start the opening of the sliding sleeve in the opening process, so that the opening device can pass through any cluster sliding sleeve and is not blocked, and the size difference between the clusters of the cluster sliding sleeve is eliminated; in the whole sliding sleeve assembly process, the short joint is directly connected, and the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole control, in particular to an infinite-stage intelligent cluster sleeve opening system. BACKGROUND

[0002] The existing cluster sleeve system is provided with a fixed ball seat on the first sleeve in each sleeve, and in the opening process, the ball seat moves downward together with the fracturing ball, and when the fracturing ball of each stage reaches the ball seat sleeve, the ball seat is taken away, and the intermediate sleeve and the cutoff sleeve are opened in turn, and finally the ball seat falls in the cutoff sleeve. This opening system is relatively troublesome to install when the preset sleeve is installed. When the sleeve is deformed, the ball seat may be stuck and cannot move forward, increasing the risk of failure.

[0003] And the existing ball-throwing cluster sleeve has a stage difference, that is, the inner diameter of the sleeve decreases from top to bottom, so that the fracturing ball used in the frontmost sleeve can pass through the previous sleeve smoothly. Due to the existence of the stage difference, on the one hand, the number of stages of the cluster sleeve is limited, and on the other hand, the cross-sectional area of the frontmost sleeve is limited, thereby affecting the mining efficiency. SUMMARY

[0004] The present application provides an infinite-stage intelligent cluster sleeve opening system to solve the above technical problems, so as to improve the reliability of the cluster sleeve opening and solve the problem of limiting the number of stages of the cluster sleeve due to the stage difference.

[0005] The technical solution of the present application to solve the above technical problems is as follows: an infinite-stage intelligent cluster sleeve opening system, comprising a cluster sleeve and an opening device;

[0006] The cluster sleeve comprises a signal emitting device, an intermediate sleeve and a seat sleeve connected in turn, at least one intermediate sleeve is arranged between the emitting device and the seat sleeve, the intermediate sleeve comprises an inner sleeve and an outer sleeve, the outer sleeve is provided with a hole, the inner sleeve is provided with an outwardly expandable claw structure near the seat sleeve end, and the inner wall of the claw structure is provided with a limiting boss; the outer sleeve is provided with a groove accommodating the claw structure near the seat sleeve end, when the claw structure moves into the groove, the inner sleeve is out of the range of the hole, so that the hole is conductive and the limiting boss does not protrude from the inner surface of the inner sleeve;

[0007] The opening device has a device body, a signal receiving device and a stop block which can extend out of the device body are arranged in the device body, when the signal receiving device receives the signal emitted by the emitting device, the stop block extends out of the device body and abuts against the limiting boss and pushes the inner sleeve to move.

[0008] The working principle and beneficial effects of the present application are as follows: the cluster-type sliding sleeve opening system of the present application is provided with a signal transmitting device and an opening device; when the opening device moves in the sliding sleeve, the stopper extends out of the device body and abuts against the limiting boss and pushes the inner sliding sleeve to move after the signal receiving device receives the signal of the transmitting device; wherein, no protruding part exists in the sliding sleeve before the intelligent opening device works, only the sliding sleeve section with matched signals can start the opening of the sliding sleeve during the opening process, therefore, the opening device can pass through any cluster-type sliding sleeve section and is not blocked, improving the reliability of the opening of the sliding sleeve; meanwhile, the short joint is directly connected during the whole sliding sleeve assembly process, without the need of additional parts, improving the installation efficiency; furthermore, the stopper does not extend out when the intelligent opening system does not reach the specified position, therefore, it can smoothly pass through any cluster-type sliding sleeve section, thus solving the problem of the level difference limiting the number of sliding sleeves of the current cluster-type sliding sleeve.

[0009] On the basis of the above technical scheme, the present application can be further improved as follows.

[0010] Further, the intermediate sliding sleeve is a plurality of.

[0011] The beneficial effects of the above further scheme are as follows: a plurality of intermediate sliding sleeves are arranged to realize stepless opening of a plurality of sliding sleeves.

[0012] On the basis of the above technical scheme, the present application can be further improved as follows.

[0013] Further, the stopper is rotationally connected with the device body and is driven by a driving device to extend out of the device body.

[0014] The beneficial effects of the above further scheme are as follows: the driving device drives the stopper to extend out of the device body, and the driving is reliable.

[0015] On the basis of the above technical scheme, the present application can be further improved as follows.

[0016] Further, the driving device comprises a support rod and a driving rod driving the support rod to move, and the support rod drives the stopper to extend out and keep the extended state.

[0017] The beneficial effects of the above further scheme are as follows: the support rod is arranged to ensure that the stopper keeps extending out of the device body.

[0018] On the basis of the above technical scheme, the present application can be further improved as follows.

[0019] Further, the driving rod is an electromagnetic driving rod.

[0020] The beneficial effects of the above further scheme are as follows: the electromagnetic driving rod has high reliability.

[0021] Based on the technical scheme, the application can be further improved as follows.

[0022] Further, one end of the advancement direction of the device body is a front end of the body, the other end is a rear end of the body, and the device body further comprises a slip and a cone, the small end of the cone is connected to the rear end of the body through a shearing structure, the device body is provided with a cavity for accommodating the small end of the cone to continue to move, and the slip is sleeved on the cone and abuts against the device body.

[0023] The beneficial effect of the further scheme is that when the device body is located in the landing sleeve, the device body is limited from continuing to move, the well fluid continues to apply a pushing force to the rear end of the body, the cone continues to move to the device body, the shearing structure is sheared off, the small end of the cone moves to the cavity, the slip cannot move to the device body due to the abutment of the slip against the device body, and the slip can only expand radially and anchor with the inner surface of the sleeve, thereby facilitating the fracturing operation.

[0024] Based on the technical scheme, the application can be further improved as follows.

[0025] Further, the shearing structure is a shearing thread arranged on the small end of the cone and the device body to interlock with each other.

[0026] The beneficial effect of the further scheme is that the shearing thread structure is simple and convenient to connect.

[0027] Based on the technical scheme, the application can be further improved as follows.

[0028] Further, the shearing structure is a shearing pin connecting the small end of the cone and the device body.

[0029] The beneficial effect of the further scheme is that the shearing pin is reliable in shearing action.

[0030] Based on the technical scheme, the application can be further improved as follows.

[0031] Further, the launching device is a signal nipple.

[0032] The beneficial effect of the further scheme is that the signal nipple is convenient and reliable, and is convenient to install. DETAILED DESCRIPTION

[0033] Figure 1 is a structural schematic diagram of a cluster-type sliding sleeve according to an embodiment of the application;

[0034] Figure 2 is a structural schematic diagram of a launching device according to an embodiment of the application;

[0035] Figure 3 is the first state diagram of cluster sliding sleeve opening system embodiment one;

[0036] Figure 4 is Figure 3 the partial view of A in the middle;

[0037] Figure 5 is the second state diagram of cluster sliding sleeve opening system embodiment one;

[0038] Figure 6 is Figure 5 the partial view of B in the middle;

[0039] Figure 7 is the third state diagram of cluster sliding sleeve opening system embodiment one;

[0040] Figure 8 is Figure 7 the partial view of C in the middle;

[0041] Figure 9 is the fourth state diagram of cluster sliding sleeve opening system embodiment one;

[0042] Figure 10 is Figure 9 the partial view of D in the middle.

[0043] In the drawings, the components represented by each number are listed as follows:

[0044] 11, signal emitting device, 12, intermediate sliding sleeve, 13, landing sliding sleeve, 121, inner sliding sleeve, 122, outer sliding sleeve, 1211, spring claw structure, 1221, groove, 1222, eyelet, 2, opening device, 21, device main body, 22, stop block, 23, support rod, 24, driving rod, 25, signal receiving device, 26, centralizing guiding device, 27, cone, 28, slip, 29, tail rubber DETAILED DESCRIPTION

[0045] The principles and features of the present application are described below in conjunction with the drawings, and the examples are used only to explain the present application and are not used to limit the scope of the present application.

[0046] The structure diagram of cluster sliding sleeve opening system embodiment one in the present application is shown in Figure 1 , Figure 3 and Figure 4 .

[0047] The cluster sliding sleeve comprises a signal transmitting device 11, an intermediate sliding sleeve 12 and a landing sliding sleeve 13 connected in sequence, a plurality of intermediate sliding sleeves 12 are arranged between the transmitting device and the landing sliding sleeve 13, the intermediate sliding sleeve 12 comprises an inner sliding sleeve 121 and an outer sliding sleeve 122, the outer sliding sleeve 122 is provided with a hole eye 1222, the inner sliding sleeve 121 is provided with an outer-expandable pawl structure 1211 at the end close to the landing sliding sleeve 13, and a limiting boss is arranged on the inner wall of the pawl structure 1211; the outer sliding sleeve 122 is provided with a groove 1221 accommodating the pawl structure 1211 at the end close to the landing sliding sleeve 13, when the pawl structure 1211 moves into the groove 1221, the inner sliding sleeve 121 is out of the range of the hole eye 1222, so that the hole eye 1222 is conducted and the limiting boss does not protrude from the inner surface of the inner sliding sleeve 121.

[0048] In the embodiment, the signal transmitting device 11 and the intermediate sliding sleeve 12, and the intermediate sliding sleeve 12 and the landing sliding sleeve 13 are connected in sequence through the short sections; wherein the radial depth of the groove 1221 is equal to the radial protruding height of the limiting boss, that is, when the pawl structure 1211 moves into the groove 1221, due to the outer-expanding characteristics of the opening device 2 and the pawl structure 1211 itself, the limiting boss and the inner surface of the inner sliding sleeve 121 are on the same plane.

[0049] The opening device 2 has a device main body 21, and the device main body 21 is provided with a signal receiving device 25 and a stop block 22 which can extend out of the device main body 21, when the signal receiving device 25 receives the signal of the transmitting device, the stop block 22 extends out of the device main body 21 and abuts against the limiting boss and pushes the inner sliding sleeve 121 to move.

[0050] The cluster sliding sleeve opening system of the application is provided with the signal transmitting device 11 and the opening device 2, when the opening device 2 moves in the sliding sleeve, when the signal receiving device 25 receives the signal of the transmitting device, the stop block 22 extends out of the device main body 21 and abuts against the limiting boss and shears the shear pin between the inner sliding sleeve and the outer sliding sleeve, and pushes the inner sliding sleeve 121 to move. Wherein in the sliding sleeve, there is no protruding part before the intelligent opening device works, only the sliding sleeve section with matched signal can start the opening of the sliding sleeve in the opening process, so the opening device 2 can pass through any cluster sliding sleeve, and is not blocked, improving the reliability of the opening of the sliding sleeve; meanwhile, in the whole sliding sleeve assembly process, the short sections are directly connected, without additional parts, improving the installation efficiency. In addition, since the stop block does not expand when the intelligent opening system does not reach the specified position, it can smoothly pass through any cluster sliding sleeve, so the problem of level difference limiting the number of sliding sleeves in the current cluster sliding sleeve is solved.

[0051] The first embodiment of the opening device 2 is described in detail as follows Figure 2Specifically, it includes a cylindrical device body 21, with one end of the device body 21 in the forward direction being the front end and the other end being the rear end. The front end of the device body is provided with a straightening guide device 26 fixedly connected to the device body 21, and a signal receiving device 25 is disposed in the straightening guide device 26. A stop block 22 is rotatably connected to the device body 21. There are multiple stop blocks 22, which are evenly distributed around the circumference of the device body 21 and are driven to extend out of the device body 21 by a driving device. The stop block 22 is connected to the device body 21 by a rotating pin and a torsion spring, wherein the torsion spring provides an auxiliary driving force for the stop block 22 to extend out of the device body 21.

[0052] In this embodiment, the driving device includes a support rod 23 and a driving rod 24 that drives the support rod 23 to move. The support rod 23 drives the stop block 22 to extend and maintain its extended state. The driving rod 24 is an electromagnetic driving rod, and the signal receiving device 25 is electrically connected to the electromagnetic driving rod 24. The driving rod 24 is drively connected to the support rod 23, such as... Figure 2 Since the stop block 22 is connected to the device body 21 via a rotating pin and a torsion spring, in order to prevent the opening device 2 from working prematurely, the front end of the support rod 23 is connected to the stop block 22 via a locking hook.

[0053] In this embodiment, one end of the device body 21 in the forward direction is the front end of the body, and the other end is the rear end of the body. It also includes a slip 28 and a cone 27. The small end of the cone 27 is connected to the rear end of the body through a shearing structure. The device body 21 is provided with a cavity to accommodate the small end of the cone 27 to continue moving towards it. The slip 28 is fitted on the cone 27 and abuts against the device body 21.

[0054] In this embodiment, the shearing structure is a shearing thread that meshes with each other on the small end of the cone 27 and the device body 21.

[0055] In order to better propel the opening device 2 forward in the well fluid, a tail rubber sleeve 29 structure is provided at the rear end of the cone 27, i.e., the left end in the figure. The tail rubber sleeve 29 is mainly used for sealing with the inner wall of the sliding sleeve so that the well fluid can generate sufficient thrust on the opening device 2.

[0056] The main body 21 of the device is provided with a signal receiving device 25 and a stop 22 that can extend out of the main body 21. When the signal receiving device 25 receives the signal from the transmitting device, the stop 22 extends out of the main body 21 and abuts against the limiting boss, cutting off the shear pin between the inner sliding sleeve 121 and the outer sliding sleeve 122, and pushing the inner sliding sleeve 121 to move.

[0057] The first state schematic diagram and partial structural schematic diagram of the cluster-type sliding sleeve opening system of the present invention are shown in the figure below. Figure 3 and Figure 4 , .

[0058] Specifically, when the opening device 2 passes the signal transmitting device 11, if the clustered sliding sleeve is the one set to be opened, that is, the signal emitted by the signal transmitting device 11 matches the signal receiving device 25, then the signal receiving device 25, upon receiving the signal, activates the drive rod 24 and pushes the support rod 23 connected to it towards the stop block 22. The locking hook connected to the front end of the support rod 23 and the stop block 22 disengages, and the torsion spring generates an auxiliary driving force, causing the stop block 22 to protrude from the outer surface of the device body 21. Simultaneously, due to the action of the support rod 23, the movement of the stop block 22 towards the axial position of the device body 21 is restricted, ensuring that the stop block 22 always protrudes from the outer surface of the device body 21. When the opening device 2 reaches the intermediate sliding sleeve 12, because the inner wall of the claw structure of the inner sliding sleeve 121 is provided with a limiting protrusion, such as... Figure 4 As shown, the stop block 22 abuts against the limiting boss. Under the continuous pressure of the well fluid, the opening device 2 applies a thrust to the inner sliding sleeve 121. When the applied thrust is greater than the shear force of the shear pin between the inner sliding sleeve 121 and the outer sliding sleeve 122, the inner sliding sleeve 121 slides away from the range of the orifice 1222 relative to the outer sliding sleeve 122, so that the radial orifice 1222 on the outer sliding sleeve 122 is open, as shown. Figure 5 and Figure 6 As shown, the sliding sleeve is opened, and then the limiting boss of the inner sleeve claw structure 1211 falls into the groove 1221 of the outer sliding sleeve 122. The opening device 2 continues to move forward under the action of well fluid pressure.

[0059] See the third and fourth state diagrams of the sliding sleeve opening system of the present invention. Figures 7 to 10 When the intermediate sliding sleeve 12 is opened, the opening device 2 moves to the seated sliding sleeve 13. Since the outer sliding sleeve 122 at the seated sliding sleeve 13 does not have a groove 1221, the stop block 22 of the opening device 2 cannot continue to move forward after pushing the seated sliding sleeve 13. Under the continuous pressure of the well fluid, when the pressure on the opening device 2 is greater than the shear force of the shear structure connection between the small end of the cone 27 and the rear end of the main body, the well fluid will push the cone 27 forward, that is, to continue to move towards the cavity on the main body 21 where the small end of the cone 27 is accommodated. Since the slip 28 abuts against the main body 21, the slip 28 cannot move towards the main body 21. It can only expand radially and anchor to the inner surface of the sliding sleeve, which is convenient for fracturing operations.

[0060] In a specific embodiment, the signal receiving device 25 can also be placed inside the main body 21 of the device, and its connection structure and working principle are the same as those in Embodiment 1.

[0061] In a specific embodiment, communication between the signal receiving device 25 and the signal transmitting device 11 can be achieved using commonly used RFID (Radio Frequency Identification) technology. In a specific embodiment, the number of intermediate sliding sleeves 12 can be set according to actual usage requirements.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An infinite-level intelligent cluster sliding sleeve opening system, characterized in that, Includes cluster-type sliding sleeves and opening devices; The cluster-type sliding sleeve includes a signal transmitting device, an intermediate sliding sleeve, and a seated sliding sleeve connected in sequence. At least one intermediate sliding sleeve is provided between the signal transmitting device and the seated sliding sleeve. The intermediate sliding sleeve includes an inner sliding sleeve and an outer sliding sleeve. The outer sliding sleeve has an eyelet. The inner sliding sleeve has an outwardly expandable pawl structure near the end of the seated sliding sleeve. The inner wall of the pawl structure has a limiting boss. The outer sliding sleeve has a groove near the end of the seated sliding sleeve to accommodate the pawl structure. When the pawl structure moves into the groove, the inner sliding sleeve moves away from the eyelet range, making the eyelet open and the limiting boss not protrude from the inner surface of the inner sliding sleeve. The opening device has a main body, within which a signal receiving device and a stop that can extend out of the main body are provided. When the signal receiving device receives a signal from the signal transmitting device, the stop extends out of the main body and abuts against the limiting boss, pushing the inner sliding sleeve to move. The stop is rotatably connected to the main body and is driven to extend out of the main body by a driving device. The driving device includes a support rod and a driving rod that drives the support rod to move. The support rod drives the stop to extend and maintains the extended state. One end of the main body of the device is the front end of the main body, and the other end is the rear end of the main body. It also includes a clip and a cone. The small end of the cone is connected to the rear end of the main body through a shearing structure. The main body of the device is provided with a cavity to accommodate the small end of the cone to continue moving forward. The clip is fitted on the cone and abuts against the main body of the device. The signal transmitting device is a signal sub-section.

2. The infinite-level intelligent cluster sliding sleeve opening system according to claim 1, characterized in that, The drive rod is an electromagnetic drive rod.

3. The infinite-level intelligent cluster sliding sleeve opening system according to claim 1, characterized in that, The shearing structure is a shearing thread that meshes with each other on the small end of the cone and the main body of the device.

4. The infinite-level intelligent cluster sliding sleeve opening system according to claim 1, characterized in that, The shearing structure is a shearing pin that connects the small end of the cone to the main body of the device.

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