Ball-opening and closing sliding sleeve

Abstract

The present invention relates to the technical field of well completion engineering for unconventional oil and gas reservoirs, and in particular to a ball-throwing opening and closing sliding sleeve, which aims to solve the problem that the existing switchable sliding sleeve needs to repeatedly lower the switch tool or drill the ball seat, and the construction cost is high and the construction risk is high. The present invention comprises a main body, an inner closing sliding sleeve and an opening sliding sleeve inserted in the main body, and the opening sliding sleeve is arranged below the inner closing sliding sleeve; a first sandblasting hole is arranged on the side wall of the main body, and the opening sliding sleeve blocks the first sandblasting hole in the initial state, and after the first soluble ball is thrown in, the opening sliding sleeve can move downward to avoid the first sandblasting hole; the inner closing sliding sleeve moves downward to block the first sandblasting hole after the second soluble ball is thrown in. The present invention can realize the opening and closing of the sliding sleeve by throwing in the first soluble ball and the second soluble ball and pressing, without the need for drilling the ball seat, lowering the sleeve switch tool and other operations, and the construction is simple, reducing the construction cost and risk.

Description

Technical Field

[0001] The invention relates to the technical field of unconventional oil and gas reservoir completion engineering, and in particular to a ball-dropping opening and closing sliding sleeve. Background Art

[0002] At present, there are two main forms of switchable sliding sleeves. One is to use a switch tool to open the sliding sleeve. If the sliding sleeve needs to be closed after the construction is completed, the switch tool is used to close it. The other is to throw a ball to open the sliding sleeve. If the sliding sleeve needs to be closed after the construction is completed, the ball seat needs to be drilled and ground first, and then the switch tool is used to close the sliding sleeve. Although the above two forms of switch sliding sleeves can realize the function of opening and closing the sliding sleeve, they have the problems of high construction cost and high construction risk due to the need to repeatedly put the switch tool or drill the ball seat. Summary of the invention

[0003] The purpose of the present invention is to provide a ball-throwing opening and closing sliding sleeve, which solves the problem that the existing switchable sliding sleeve needs to repeatedly lower the opening and closing tool or drill and grind the ball seat, resulting in high construction cost and great construction risk.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] A ball-throwing opening and closing sliding sleeve comprises a body, an inner closing sliding sleeve and an opening sliding sleeve inserted in the body, wherein the opening sliding sleeve is arranged below the inner closing sliding sleeve; a first sandblasting hole is arranged on the side wall of the body.

[0006] The opening sliding sleeve blocks the first sandblasting hole in the initial state. After the first soluble ball is put in, the opening sliding sleeve can move downward to avoid the first sandblasting hole; the inner closing sliding sleeve moves downward to block the first sandblasting hole after the second soluble ball is put in.

[0007] Furthermore, the ball-throwing opening and closing sliding sleeve also includes a first shear nail, which radially passes through the side wall of the main body and is inserted into the opening sliding sleeve; after the first soluble ball falls into the entrance of the opening sliding sleeve, a pressing operation is performed, and the opening sliding sleeve shears the first shear nail to release the lock on the opening sliding sleeve.

[0008] Furthermore, the pitching opening and closing type sliding sleeve also includes a lower joint mounted on the lower side of the main body and a first C-shaped locking ring clamped on the outer side of the opening sliding sleeve; the lower joint is provided with a first step, and a first limiting groove is formed between the first step and the lower end surface of the main body; before the opening sliding sleeve moves downward, the main body presses the first C-shaped locking ring into the groove on the outer side of the opening sliding sleeve; after the opening sliding sleeve moves downward, the first C-shaped locking ring moves down to the first limiting groove, the outer diameter of the first C-shaped locking ring becomes larger and is clamped in the first limiting groove, and the opening sliding sleeve avoids the first sandblasting hole.

[0009] Furthermore, the ball-throwing opening and closing type sliding sleeve also includes a second shear pin, which radially passes through the side wall of the main body and is inserted into the inner closing sliding sleeve; after the second soluble ball falls into the entrance of the inner closing sliding sleeve, a pressing operation is performed, and the inner closing sliding sleeve shears the second shear pin to release the lock of the inner closing sliding sleeve.

[0010] Furthermore, the ball-pitching opening and closing slide also includes a second C-shaped locking ring clamped on the outside of the inner closing slide; the main body presses the second C-shaped locking ring into the groove on the outside of the inner closing slide; a second limiting groove is provided on the inner side of the main body; after the inner closing slide moves downward, the second C-shaped locking ring moves downward to the second limiting groove, the outer diameter of the second C-shaped locking ring becomes larger and is clamped in the second limiting groove, and at this time the inner closing slide blocks the first sandblasting hole.

[0011] Furthermore, the pitching opening and closing slide also includes an outer closing slide sleeve mounted on the main body, and a second sandblasting hole is provided on the side wall of the outer closing slide sleeve. Before the outer closing slide sleeve is started, the second sandblasting hole is connected to the first sandblasting hole.

[0012] After the second soluble ball is put in and pressurized into the pipe string, the outer closing sleeve moves downward to the second sandblasting hole and is misaligned with the first sandblasting hole to block the first sandblasting hole.

[0013] Furthermore, the ball-pitching opening and closing slide sleeve also includes a control lock block, which has a locked state and an unlocked state; in the locked state, the control lock block radially passes through the main body and is inserted into the side wall of the outer closing slide sleeve, and the outer side of the opening slide sleeve abuts against the control lock block; in the unlocked state, the opening slide sleeve releases contact with the control lock block, and the control lock block can move in the direction of the opening slide sleeve until it is separated from the outer closing slide sleeve.

[0014] Furthermore, a pressure transmission hole is provided on the side wall of the body, and the pressure transmission hole is arranged above the inner closing sliding sleeve. The pressure transmission hole connects the power space surrounded by the outer closing sliding sleeve and the body with the inner cavity of the body.

[0015] Furthermore, the ball-throwing opening and closing type sliding sleeve also includes a third shear pin, which radially passes through the side wall of the outer closing sliding sleeve and is then inserted into the main body; after the second soluble ball falls into the entrance of the inner closing sliding sleeve, a pressing operation is performed, and the outer closing sliding sleeve shears off the third shear pin after the pressure is transmitted through the power space. At this time, the outer closing sliding sleeve moves downward to block the first sandblasting hole, and at the same time, the outer closing sliding sleeve pushes the control locking block to move in the direction of the opening sliding sleeve, so that the control locking block enters an unlocked state.

[0016] Furthermore, the ball-pitching opening and closing slide also includes a third C-shaped locking ring clamped on the inner side of the outer closing slide, and the main body presses the third C-shaped locking ring into the groove on the inner side of the outer closing slide; a third limiting groove is arranged on the outer side of the main body; after the outer closing slide moves downward, the third C-shaped locking ring moves downward to the third limiting groove, and the inner diameter of the third C-shaped locking ring becomes smaller and is clamped in the third limiting groove.

[0017] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0018] The ball-throwing opening and closing sliding sleeve provided by the present invention comprises a body, an inner closing sliding sleeve and an opening sliding sleeve inserted in the body, wherein the opening sliding sleeve is arranged below the inner closing sliding sleeve; a first sandblasting hole is arranged on the side wall of the body.

[0019] The opening sliding sleeve blocks the first sandblasting hole in the initial state. After the first soluble ball is put in, the opening sliding sleeve can move downward to avoid the first sandblasting hole; the inner closing sliding sleeve moves downward to block the first sandblasting hole after the second soluble ball is put in.

[0020] Since the ball-throwing opening and closing sliding sleeve provided by the present invention closes the entrances of the corresponding opening sliding sleeve and the inner closing sliding sleeve by throwing in the first soluble ball and the second soluble ball, and pushes the opening sliding sleeve and the inner closing sliding sleeve downward respectively under the action of pressure after being pressed, the first sandblasting hole is opened and closed, and then the sliding sleeve is opened and closed. The opening and closing of the sliding sleeve can be realized by throwing in the first soluble ball and the second soluble ball and pressing, without the need for operations such as drilling and grinding the ball seat and the lower sliding sleeve opening and closing tools, the construction is simple, and the construction cost and risk are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A cross-sectional view of a ball-throwing opening and closing sliding sleeve provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of opening the ball-throwing opening and closing sliding sleeve provided in an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of closing by the inner closing sleeve 200 of the present invention;

[0025] Figure 4 This is a schematic diagram of closing through an outer closing sleeve 1100 of the present invention;

[0026] Figure 5 It is a schematic diagram of the present invention being closed simultaneously by the inner closing sleeve 200 and the outer closing sleeve 1100;

[0027] Figure 6 It is a structural schematic diagram of the main body 100 of the present invention;

[0028] Figure 7It is a structural schematic diagram of the outer closing sleeve 1100 of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the opening sliding sleeve 300 of the present invention;

[0030] Fig. 9 It is a schematic structural diagram of the lower joint 700 of the present invention.

[0031] Icon: 100-main body; 200-inner closing sleeve; 300-opening sleeve; 400-first soluble ball; 500-second soluble ball; 600-first shear pin; 700-lower joint; 800-first C-type locking ring; 900-second shear pin; 1000-second C-type locking ring; 1100-outer closing sleeve; 1200-third shear pin; 1300-control locking block; 1400-third C-type locking ring; 110-first sandblasting hole; 120-second limiting groove; 130-pressure transmission hole; 140-third limiting groove; 150-third step; 160-fourth step; 170-locking block hole; 310-control groove; 710-first step; 720-first limiting groove; 730-second step; 1110-second sandblasting hole; 1120-fifth step; 1130-limiting ring. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] The existing switchable sliding sleeve requires repeated installation of switch tools or drilling and grinding of the ball seat, which has the problems of high construction cost and high construction risk.

[0040] In view of this, the present invention provides a ball-throwing opening and closing sliding sleeve, comprising a main body 100, an inner closing sliding sleeve 200 inserted into the main body 100, and an opening sliding sleeve 300, wherein the opening sliding sleeve 300 is arranged below the inner closing sliding sleeve 200; a first sandblasting hole 110 is arranged on the side wall of the main body 100.

[0041] The opening sleeve 300 blocks the first sandblasting hole 110 in the initial state. After the first soluble ball 400 is put in, the opening sleeve 300 can move downward to avoid the first sandblasting hole 110; the inner closing sleeve 200 moves downward to block the first sandblasting hole 110 after the second soluble ball 500 is put in.

[0042] Since the ball-throwing opening and closing sliding sleeve provided by the present invention closes the entrances of the corresponding opening sliding sleeve 300 and the inner closing sliding sleeve 200 by throwing in the first soluble ball 400 and the second soluble ball 500, and pushes the opening sliding sleeve 300 and the inner closing sliding sleeve 200 downward respectively under the action of pressure after being pressed, the first sandblasting hole 110 is opened and closed, and the opening and closing of the sliding sleeve is realized. The opening and closing of the sliding sleeve can be realized by throwing in the first soluble ball 400 and the second soluble ball 500 and pressing, without the need for operations such as drilling and grinding the ball seat and the lower sliding sleeve opening and closing tool, the construction is simple, and the construction cost and risk are reduced.

[0043] The following is combined with Figure 1-9 The structure and shape of the ball-throwing opening and closing sliding sleeve provided in this embodiment are described in detail:

[0044] The ball-casting opening and closing sliding sleeve provided in this embodiment further includes a first shear pin 600. Figure 1 , 2 As shown, the first shear nail 600 radially passes through the side wall of the main body 100 and is inserted into the opening sleeve 300, so that the main body 100 and the opening sleeve 300 are fixedly connected; the first soluble ball 400 falls into the entrance of the opening sleeve 300 and seals the entrance of the opening sleeve 300, and then a pressing operation is performed. The opening sleeve 300 cuts off the first shear nail 600 to release the lock of the opening sleeve 300, so that the opening sleeve 300 moves downward.

[0045] Furthermore, the pitching opening and closing sliding sleeve also includes a lower joint 700 sleeved on the lower side of the body 100, such as Figure 1 , 6 As shown in Figures 9 and 10, the lower side of the body 100 is provided with an external thread, the upper side of the lower joint 700 is provided with an internal thread, and the lower side of the body 100 is threadedly connected with the upper side of the lower joint 700. The lower joint 700 is provided with a second step 730, which abuts against the lower end surface of the body 100 to limit the depth of the body 100 inserted into the lower joint 700.

[0046] Furthermore, a first step 710 is provided on the lower joint 700 . The first step 710 is provided below the second step 730 and forms a first limiting groove 720 with the lower end surface of the body 100 .

[0047] Furthermore, the pitching opening and closing sliding sleeve also includes a first C-shaped locking ring 800 that is clamped on the outer side of the opening sliding sleeve 300. Figure 1 As shown, the inner side of the body 100 abuts against the outer circle of the first C-shaped locking ring 800. Before the opening sliding sleeve 300 moves downward, the body 100 presses the first C-shaped locking ring 800 into the groove outside the opening sliding sleeve 300. Figure 2As shown, after the opening sleeve 300 moves downward, the opening sleeve 300 drives the first C-shaped locking ring 800 to move downward at the same time. When the first C-shaped locking ring 800 moves downward to the first limiting groove 720, the outer diameter of the first C-shaped locking ring 800 becomes larger and is clamped in the first limiting groove 720. At this time, the first C-shaped locking ring 800 is clamped in the groove outside the opening sleeve 300 and the first limiting groove 720 at the same time, so that the opening sleeve 300 remains away from the first sandblasting hole 110.

[0048] Furthermore, a sealing groove is provided on the outer side of the opening sliding sleeve 300 , and a sealing ring is provided in the sealing groove to improve the sealing performance between the opening sliding sleeve 300 and the body 100 .

[0049] Furthermore, the pitching opening and closing sliding sleeve also includes a second shear nail 900, such as Figure 1 , 3 As shown, the second shear nail 900 radially passes through the side wall of the main body 100 and is inserted into the inner closing sleeve 200, so that the main body 100 is fixedly connected with the inner closing sleeve 200; after the second soluble ball 500 falls into the entrance of the inner closing sleeve 200 and seals the entrance of the inner closing sleeve 200, a pressing operation is performed, and the inner closing sleeve 200 cuts off the second shear nail 900 to release the lock of the inner closing sleeve 200, so that the inner closing sleeve 200 moves downward.

[0050] Furthermore, the pitching opening and closing sliding sleeve also includes a second C-shaped locking ring 1000 clamped on the outer side of the inner closing sliding sleeve 200. Figure 1 As shown, the inner side of the main body 100 abuts against the outer circle of the second C-shaped locking ring 1000 , and the main body 100 presses the second C-shaped locking ring 1000 into the groove on the outer side of the inner closing sliding sleeve 200 .

[0051] Furthermore, a second limiting groove 120 is provided on the inner side of the body 100. Figure 3 As shown, after the inner closing sleeve 200 moves downward, the inner closing sleeve 200 drives the second C-shaped locking ring 1000 to move downward at the same time. When the second C-shaped locking ring 1000 moves downward to the second limiting groove 120, the outer diameter of the second C-shaped locking ring 1000 becomes larger and is clamped in the second limiting groove 120. At this time, the second C-shaped locking ring 1000 is clamped in the groove on the outer side of the inner closing sleeve 200 and in the second limiting groove 120 at the same time, so that the inner closing sleeve 200 maintains the position of blocking the first sandblasting hole 110.

[0052] Furthermore, a sealing groove is provided on the outer side of the inner closing sliding sleeve 200 , and a sealing ring is provided in the sealing groove to improve the sealing performance between the inner closing sliding sleeve 200 and the body 100 .

[0053] Furthermore, the pitching opening and closing sliding sleeve also includes an outer closing sliding sleeve 1100 sleeved on the main body 100, such as Figure 1 , 6As shown in , 7 , a third step 150 is provided on the main body 100 , and the upper end surface of the outer closing sliding sleeve 1100 abuts against the third step 150 .

[0054] Furthermore, a fourth step 160 is provided on the main body 100, and the fourth step 160 is provided below the third step 150. A fifth step 1120 is provided on the outer closing sleeve 1100. The inner side of the outer closing sleeve 1100, the outer side of the main body 100, the fourth step 160 and the fifth step 1120 form an annular power space.

[0055] Furthermore, a pressure transmission hole 130 is provided on the side wall of the body 100. Figure 1 The pressure transmission hole 130 is arranged above the inner closing sleeve 200 and connects the power space with the inner cavity of the body 100, so that the pressure of the inner cavity of the body 100 is transmitted to the power space.

[0056] Furthermore, the side wall of the outer closing sleeve 1100 is provided with a second sandblasting hole 1110, such as Figure 1 , 2 As shown in FIG. 3 , before the outer closing sleeve 1100 is started, the second sandblasting hole 1110 is connected to the first sandblasting hole 110 .

[0057] Furthermore, the pitching opening and closing sliding sleeve also includes a control lock block 1300, such as Figure 1 , 6 As shown, the body 100 is provided with a locking block hole 170, and the control locking block 1300 passes through the locking block hole 170; Figure 7 As shown, a limit ring 1130 is provided on the inner side of the outer closing sleeve 1100. Figure 1 As shown, before the opening sleeve 300 is started, the control lock block 1300 radially passes through the lock block hole 170 and is inserted into the limit ring 1130, and the outer side of the opening sleeve 300 abuts against the control lock block 1300 to limit the movement of the control lock block 1300, thereby preventing the outer closing sleeve 1100 from being accidentally started due to the pressure in the inner cavity of the main body 100 when the opening sleeve 300 is opened through the restriction of the control lock block 1300.

[0058] Further, such as Figure 8 As shown, a control groove 310 is provided on the outer side of the opening sleeve 300. After the opening sleeve 300 moves downward to open, the control groove 310 moves downward to put the control lock block 1300 in an unlocked state. At this time, the control lock block 1300 abuts against one side of the opening sleeve 300 and points to the inside of the control groove 310 and does not contact the outer side of the opening sleeve 300. At this time, the outer closing sleeve 1100 is activated and can move downward to block the first sandblasting hole 110.

[0059] Furthermore, the pitching opening and closing sliding sleeve also includes a third shear nail 1200, such as Figure 1 ,4 As shown, the third shear nail 1200 radially passes through the side wall of the outer closing sleeve 1100 and is inserted into the main body 100, so that the outer closing sleeve 1100 and the main body 100 are fixedly connected; after the second soluble ball 500 falls into the entrance of the inner closing sleeve 200 and seals the entrance of the inner closing sleeve 200, a pressing operation is performed, and the pressure of the inner cavity of the main body 100 enters the power space through the pressure transmission hole 130, pushing the outer closing sleeve 1100 to cut off the third shear nail 1200, releasing the lock on the outer closing sleeve 1100, and moving the outer closing sleeve 1100 downward, the second sandblasting hole 1110 is offset from the first sandblasting hole 110 to block the first sandblasting hole 110, and at the same time, in the process of the outer closing sleeve 1100 moving downward, as shown in FIG. Figure 4 , 5 As shown, the outer closing sliding sleeve 1100 pushes the control locking block 1300 to move into the control groove 310 , so that the control locking block 1300 is separated from the outer closing sliding sleeve 1100 .

[0060] Furthermore, the pitching opening and closing sliding sleeve also includes a third C-shaped locking ring 1400 which is clamped on the inner side of the outer closing sliding sleeve 1100. Figure 1 As shown, the outer side of the main body 100 abuts against the inner circle of the third C-shaped locking ring 1400 , and the main body 100 presses the third C-shaped locking ring 1400 into the groove on the inner side of the outer closing sliding sleeve 1100 .

[0061] Further, such as Figure 6 As shown, a third limiting groove 140 is provided on the outer side of the body 100; Figure 4 , 5 As shown, after the outer closing sleeve 1100 moves downward, the outer closing sleeve 1100 drives the third C-shaped locking ring 1400 to move downward at the same time. When the third C-shaped locking ring 1400 moves downward to the third limiting groove 140, the inner diameter of the third C-shaped locking ring 1400 becomes smaller and is clamped in the third limiting groove 140. At this time, the third C-shaped locking ring 1400 simultaneously unlocks the groove on the inner side of the outer closing sleeve 1100 and the third limiting groove 140, so that the outer closing sleeve 1100 maintains the position of blocking the first sandblasting hole 110.

[0062] Furthermore, a sealing groove is provided on the inner side of the outer closing sleeve 1100 , and a sealing ring is provided in the sealing groove to improve the sealing performance between the outer closing sleeve 1100 and the body 100 .

[0063] The working process of the ball-casting opening and closing sliding sleeve provided in this embodiment is as follows:

[0064] The first soluble ball 400 is put into the opening sleeve 300, and after the first soluble ball 400 falls into the entrance of the opening sleeve 300 and closes the entrance of the opening sleeve 300, a pressing operation is performed. The opening sleeve 300 cuts off the first shear nail 600 under the action of pressure, and the opening sleeve 300 and the first soluble ball 400 fall to the first step 710. At the same time, the first limiting lock ring is clamped in the first limiting groove 720 to fix the position of the opening sleeve 300. At this time, the opening sleeve 300 avoids the first sandblasting hole 110, so that the sleeve is opened.

[0065] When it is necessary to close the sleeve, a second soluble ball 500 is put in. The diameter of the second soluble ball 500 is larger than that of the first soluble ball 400. After the second soluble ball 500 falls into the entrance of the inner closing sleeve 200 and seals the entrance of the inner closing sleeve 200, a pressing operation is performed. The inner closing sleeve 200 cuts off the second shear pin 900 under pressure, and the inner closing sleeve 200 and the second soluble ball 500 move downward. When the second C-type locking ring 1000 moves downward to the second limiting groove 120 with the inner closing sleeve 200, the second C-type locking ring 1000 returns to its original state and is engaged with the second limiting groove 120 to lock the position of the inner closing sleeve 200. At this time, the inner closing sleeve 200 blocks the first sandblasting hole 110 to achieve the closure of the sleeve.

[0066] At the same time, since the control lock block 1300 is in an unlocked state after the opening sleeve 300 moves downward, when the second soluble ball 500 is put into the closing sleeve, the pressure in the inner cavity of the body 100 can enter the power space through the pressure transmission hole 130 and push the outer closing sleeve 1100 to cut the third shear nail 1200 and push the outer closing sleeve 1100 to move downward, so that the second sandblasting hole 1110 is misaligned with the first sandblasting hole 110, the first sandblasting hole 110 is blocked, and the sleeve is closed. After the outer closing sleeve 1100 moves downward, the third C-shaped lock ring 1400 is clamped in the third limiting groove 140, locking the position of the outer closing sleeve 1100, so that the sleeve remains in a closed state.

[0067] When the second soluble ball 500 is put into the closing sleeve, both the inner closing sleeve 200 and the outer closing sleeve 1100 may be activated. Figure 3 , 4 As shown in Figures 5 and 6, the inner closing sleeve 200 is started alone, the outer closing sleeve 1100 is started alone, and the inner closing sleeve 200 and the outer closing sleeve 1100 are started simultaneously, so that when the inner closing sleeve 200 or the outer closing sleeve 1100 fails, the other one can still close the sleeve, thereby achieving double protection of the closing sleeve and improving the reliability of the closing sleeve.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ball-casting opening and closing sliding sleeve, characterized in that: It comprises a body (100), an inner closing sliding sleeve (200) inserted into the body (100), and an opening sliding sleeve (300), wherein the opening sliding sleeve (300) is arranged below the inner closing sliding sleeve (200); A first sandblasting hole (110) is provided on the side wall of the body (100); The opening sliding sleeve (300) blocks the first sandblasting hole (110) in an initial state, and after the first soluble ball (400) is put in, the opening sliding sleeve (300) can move downward to avoid the first sandblasting hole (110); The inner closing sliding sleeve (200) moves downward to block the first sandblasting hole (110) after the second soluble ball (500) is put into the inner closing sliding sleeve (200); It also includes an outer closing sliding sleeve (1100) sleeved on the body (100), and a second sandblasting hole (1110) is provided on the side wall of the outer closing sliding sleeve (1100); Before the outer closing sliding sleeve (1100) is activated, the second sandblasting hole (1110) is communicated with the first sandblasting hole (110); After the second soluble ball (500) is put into the pipe column and pressurized, the outer closing sleeve (1100) moves downward until the second sandblasting hole (1110) is misaligned with the first sandblasting hole (110) to block the first sandblasting hole (110); Also included is a control lock block (1300), wherein the control lock block (1300) has a locked state and an unlocked state; In the locked state, the control lock block (1300) passes through the body (100) in the radial direction and is inserted into the side wall of the outer closing sliding sleeve (1100), and the outer side of the opening sliding sleeve (300) abuts against the control lock block (1300); In the unlocked state, the opening sliding sleeve (300) is released from contact with the control lock block (1300), and the control lock block (1300) can move in the direction of the opening sliding sleeve (300) until it is separated from the outer closing sliding sleeve (1100); The side wall of the body (100) is provided with a pressure transmission hole (130), and the pressure transmission hole (130) is arranged above the inner closing sleeve (200). The pressure transmission hole (130) connects the power space enclosed by the outer closing sleeve (1100) and the body (100) with the inner cavity of the body (100).

2. The pitching opening and closing sliding sleeve according to claim 1 is characterized in that: It also includes a first shearing nail (600), wherein the first shearing nail (600) radially passes through the side wall of the body (100) and is then inserted into the opening sliding sleeve (300); After the first soluble ball (400) falls into the entrance of the opening sliding sleeve (300), a pressing operation is performed, and the opening sliding sleeve (300) cuts off the first shear pin (600) to release the lock of the opening sliding sleeve (300).

3. The pitching opening and closing sliding sleeve according to claim 2 is characterized in that , further comprising a lower joint (700) sleeved on the lower side of the body (100) and a first C-shaped locking ring (800) clamped on the outer side of the opening sliding sleeve (300); The lower joint (700) is provided with a first step (710), and a first limiting groove (720) is formed between the first step (710) and the lower end surface of the body (100); Before the opening sliding sleeve (300) moves downward, the main body (100) presses the first C-shaped locking ring (800) into the groove outside the opening sliding sleeve (300); After the opening sliding sleeve (300) moves downward, the first C-shaped locking ring (800) moves downward to the first limiting groove (720), the outer diameter of the first C-shaped locking ring (800) becomes larger and is clamped in the first limiting groove (720), and at this time, the opening sliding sleeve (300) avoids the first sandblasting hole (110).

4. The pitching opening and closing sliding sleeve according to claim 3 is characterized in that: It also includes a second shear nail (900), which penetrates the side wall of the body (100) in the radial direction and is then inserted into the inner closing sleeve (200); After the second soluble ball (500) falls into the entrance of the inner closing sliding sleeve (200), a pressing operation is performed, and the inner closing sliding sleeve (200) cuts off the second shear pin (900) to release the lock of the inner closing sliding sleeve (200).

5. The ball-pitch opening and closing sliding sleeve according to claim 4, characterized in that: It also includes a second C-shaped locking ring (1000) clamped on the outside of the inner closing sliding sleeve (200); The body (100) presses the second C-shaped locking ring (1000) into a groove on the outside of the inner closing sliding sleeve (200); A second limiting groove (120) is provided on the inner side of the body (100); After the inner closing sleeve (200) moves downward, the second C-shaped locking ring (1000) moves downward to the second limiting groove (120), the outer diameter of the second C-shaped locking ring (1000) becomes larger and is engaged with the second limiting groove (120), and at this time, the inner closing sleeve (200) blocks the first sandblasting hole (110).

6. The pitching opening and closing sliding sleeve according to claim 5, characterized in that: It also includes a third shear nail (1200), wherein the third shear nail (1200) radially passes through the side wall of the outer closing sliding sleeve (1100) and is then inserted into the body (100); After the second soluble ball (500) falls into the entrance of the inner closing sleeve (200), a pressing operation is performed, and the outer closing sleeve (1100) shears off the third shear pin (1200) after the pressure is transmitted through the power space. At this time, the outer closing sleeve (1100) moves downward to block the first sandblasting hole (110), and at the same time, the outer closing sleeve (1100) pushes the control lock block (1300) to move in the direction of the opening sleeve (300), so that the control lock block (1300) enters an unlocked state.

7. The ball-throwing opening and closing sliding sleeve according to claim 6, characterized in that: It also includes a third C-shaped locking ring (1400) clamped on the inner side of the outer closing sliding sleeve (1100), and the body (100) presses the third C-shaped locking ring (1400) into the groove on the inner side of the outer closing sliding sleeve (1100); A third limiting groove (140) is provided on the outer side of the body (100); After the outer closing sleeve (1100) moves downward, the third C-shaped locking ring (1400) moves downward to the third limiting groove (140), and the inner diameter of the third C-shaped locking ring (1400) becomes smaller and is clamped in the third limiting groove (140).

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