Combined casing pipe for reservoir fracturing

Abstract

The utility model discloses a combined casing pipe for reservoir fracturing, and relates to the technical field of casing pipes. The oil pipe comprises an oil pipe body and an outer pipe body which are distributed inside and outside, a first connecting groove and a second connecting groove are formed in the two ends of the oil pipe body respectively, a clamping groove is formed in the first connecting groove, a first magnet is arranged in the clamping groove, and a clamping block matched with the clamping groove in an inserted mode is arranged in the second connecting groove. The clamping block is provided with a second magnet magnetically attracted with the first magnet, the two ends of the outer pipe are provided with an annular cavity and an annular groove which are communicated, and the device further comprises two annular plates which are hinged to each other and can be enclosed in the annular cavity. The mode of threaded connection and combination in the prior art is abandoned, during use, connection and combination operation of the two adjacent oil pipes and the two adjacent outer pipes can be convenient, the situation that connection cannot be achieved due to thread slipping can be avoided, meanwhile, the sealing performance can be guaranteed, and therefore higher practicability is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of casing, and in particular to a combined casing for reservoir fracturing. Background Art

[0002] CO2, as an energizing gas, has been used to improve gas well recovery rates abroad since the 1950s, and has been widely used in production increase operations since the 1960s. At present, pure CO2 fracturing, CO2 foam fracturing and CO2 energizing fracturing have been formed at home and abroad. In the CO2 fracturing process, a combined casing is generally used for pumping. The combined casing is an oil pipe and an outer pipe distributed inside and outside. The oil pipe is pumped with a large displacement of gel sand-carrying fluid. The sand-carrying fluid is added with ceramsite proppants with medium or larger particle sizes. The outer pipe is injected with a mixture of slick water and CO2 of one oil pipe volume to maintain the casing oil pressure balance. In the existing technology, two adjacent oil pipes and two adjacent outer pipes are combined by threaded connection, which is more troublesome to operate and may also lead to the situation that the connection cannot be made due to thread slippage. Therefore, a combined casing for reservoir fracturing is proposed. Summary of the Invention

[0003] The purpose of the present application is to solve the technical problem that two adjacent oil pipes and two adjacent outer pipes are connected by threads, which is troublesome to operate and may lead to the situation that the connection cannot be made due to thread slippage. The present application provides a combined casing for reservoir fracturing.

[0004] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0005] A combined casing for reservoir fracturing, comprising an oil pipe and an outer pipe distributed inside and outside, wherein the two ends of the oil pipe are respectively constructed with a first connecting groove and a second connecting groove, a card slot is provided in the first connecting groove, a first magnet is provided in the card slot, a card block is provided in the second connecting groove and is plugged into the card slot, a second magnet is provided on the card block and is magnetically attracted to the first magnet, both ends of the outer pipe are constructed with a connected annular cavity and annular groove, and also include two ring plates that are hinged to each other and can be enclosed in the annular cavity, two arc-shaped strips are provided on the ring plates, both of which are plugged into the annular groove, through holes are provided on the two ring plates, the two through holes are connected and form a through hole, a rod is movably inserted in the through hole, a locking piece is provided on the rod, and the rod is locked or unlocked by the locking piece.

[0006] Furthermore, a sealing groove is provided at one end of the oil pipe, and a sealing ring is provided at the other end to be plugged into and matched with the sealing groove.

[0007] Furthermore, the locking member includes a movable groove opened on the insertion rod, a sliding rod and a plurality of locking rods are slidably arranged in the movable groove, a tension spring is arranged between the sliding rod and the insertion rod, one end of the locking rod is conical in structure and is in contact with and overlaps one of the ring plates, and the other end is wedge-shaped in structure and is in contact with and overlaps the sliding rod.

[0008] Furthermore, a fixing rod is provided on the insertion rod, and a locking portion is provided between the fixing rod and the sliding rod, and the sliding rod is locked or unlocked by the locking portion.

[0009] Furthermore, the locking portion includes a hook provided on the fixed rod, and the sliding rod is hinged with a hanging ring that is hooked and matched with the hook.

[0010] Furthermore, a first sealed cavity and a second sealed cavity are respectively formed at both ends of the outer tube, and a sealing member is provided between the first sealed cavity and the second sealed cavity.

[0011] Furthermore, the sealing member includes a first sealing ring arranged in the first sealing cavity and plugged into the second sealing cavity, the first sealing ring is provided with a groove, and the second sealing ring is arranged in the second sealing cavity and plugged into the groove.

[0012] Furthermore, the sealing ring, the first sealing ring and the second sealing ring are all configured with guiding inclined surfaces.

[0013] The beneficial effects of this application are as follows:

[0014] The present application abandons the method of threaded connection combination in the prior art. When used, it can not only make the connection combination of two adjacent oil pipes and two adjacent outer pipes convenient to operate, but also avoid the situation where connection cannot be made due to thread slippage, and at the same time ensure the sealing performance, so it is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the structure of this application;

[0016] Figure 2 It is a three-dimensional cross-sectional view of the present application;

[0017] Figure 3 This application Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 This application Figure 2 Enlarged view of point B in the middle;

[0019] Figure 5 This application Figure 2 Enlarged view of point C in the middle;

[0020] Figure 6 This application Figure 2 Enlarged view of point D in the middle;

[0021] Figure 7 This is a three-dimensional diagram of the oil pipe structure of this application;

[0022] Figure 8 It is a three-dimensional diagram of the structure of part of this application;

[0023] Figure 9 This application Figure 8 A three-dimensional cross-sectional view of

[0024] Figure 10 This application Figure 9 Enlarged view of point E in the middle;

[0025] Figure 11 This application Figure 9 Enlarged view of point F in the middle.

[0026] Figure numerals: 1, oil pipe; 2, outer pipe; 3, first connecting groove; 4, second connecting groove; 5, clamping groove; 6, first magnet; 7, clamping block; 8, second magnet; 9, annular cavity; 10, annular groove; 11, ring plate; 12, arc-shaped strip; 13, through hole; 14, insertion rod; 15, sealing groove; 16, sealing ring; 17, movable groove; 18, sliding rod; 19, locking rod; 20, tension spring; 21, fixing rod; 22, hook; 23, hanging ring; 24, first sealing cavity; 25, second sealing cavity; 26, first sealing ring; 27, groove; 28, second sealing ring. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0028] like Figures 1-11As shown, a combined casing for reservoir fracturing proposed in one embodiment of the present application includes an oil pipe 1 and an outer pipe 2 distributed inside and outside, the oil pipe 1 and the outer pipe 2 are both in a vertical direction, and a first connecting groove 3 and a second connecting groove 4 are respectively constructed at both ends of the oil pipe 1, the first connecting groove 3 is located at the bottom end of the oil pipe 1, and the second connecting groove 4 is located at the top end of the oil pipe 1, a card groove 5 is opened in the first connecting groove 3, the card groove 5 includes a connected strip groove and an arc groove, a first magnet 6 is provided in the card groove 5, the first magnet 6 is fixed in the arc groove of the card groove 5, a card block 7 is provided in the second connecting groove 4 and is plugged into the card groove 5, and the card block 7 is fixed in the second connecting groove 4, a second magnet 8 that is magnetically attracted to the first magnet 6 is provided on the card block 7, and the second magnet 8 is fixed on the card block 7. Both ends of the outer tube 2 are constructed with a communicating annular cavity 9 and annular groove 10, and also include two ring plates 11 that are hinged to each other and can be enclosed in the annular cavity 9, and the ring plate 11 is provided with two arcuate bars 12 that are plugged into the annular groove 10. The arcuate bars 12 are fixed on the ring plate 11, and the two ring plates 11 are each provided with a through hole 13. The two through holes 13 are connected and form a through hole, and a rod 14 is movably inserted in the through hole. A locking piece is provided on the rod 14, and the rod 14 is locked or unlocked by the locking piece.

[0029] When in use, the two oil pipes 1 are connected end to end, the first connecting groove 3 is plugged into the second connecting groove 4, the clamping block 7 is first plugged into the strip groove of the clamping groove 5, and then one of the oil pipes 1 is rotated, and the clamping block 7 enters the arc groove from the strip groove until the second magnet 8 and the first magnet 6 are in conflict and overlap and magnetically attracted to each other, so as to complete the connection combination of the two oil pipes 1, and the two oil pipes 1 cannot be separated, so that the two outer pipes 2 are connected end to end, the two annular cavities 9 are connected, the two ring plates 11 are enclosed and clamped in the two annular cavities 9, the arc strip 12 is plugged into the annular groove 10, the two through holes 13 are connected and form a through hole, and then the insertion rod 14 is movably inserted into the through hole, the insertion rod 14 is in conflict and overlap with one of the ring plates 11, and the insertion rod 14 is locked by the locking piece so that the insertion rod 14 cannot withdraw from the through hole, so as to complete the connection combination of the two outer pipes 2;

[0030] In summary, the present application abandons the threaded connection combination method in the prior art. When in use, the connection combination of two adjacent oil pipes 1 and two adjacent outer pipes 2 is easy to operate and therefore more practical.

[0031] like Figure 3-Figure 4 As shown, in some embodiments, a sealing groove 15 is formed at one end of the oil pipe 1, and a sealing ring 16 is provided at the other end to be plugged into and matched with the sealing groove 15. The sealing groove 15 is located at the top end of the oil pipe 1, and the sealing ring 16 is horizontally oriented and fixedly disposed at the bottom end of the oil pipe 1.

[0032] As mentioned above, when the two oil pipes 1 are connected end to end, the sealing ring 16 corresponds to and is inserted into the sealing groove 15, thereby forming a sealing structure between the two oil pipes 1 and improving the sealing performance.

[0033] like Figure 10-11 As shown, in some embodiments, the locking member includes a movable groove 17 provided on the insertion rod 14, a sliding rod 18 and a plurality of locking rods 19 are slidably provided in the movable groove 17, the sliding rod 18 slides in the vertical direction, and the plurality of locking rods 19 are distributed in a ring array and all slide in the horizontal direction, a tension spring 20 is provided between the sliding rod 18 and the insertion rod 14, the tension spring 20 is in a vertical direction and the two ends are fixedly connected to the sliding rod 18 and the insertion rod 14 respectively, one end of the locking rod 19 is conical and contacts and overlaps with one of the ring plates 11, and the other end is wedge-shaped and contacts and overlaps with the sliding rod 18;

[0034] With reference to the above, in the initial state, the tension spring 20 is in a natural state, the slide bar 18 and the locking rod 19 are both in the initial position, the wedge-shaped end of the locking rod 19 is in contact with the slide bar 18, and the conical end of the locking rod 19 is located outside. When the insertion rod 14 is movably inserted in the through hole, the slide bar 18 slides to the limit position, the tension spring 20 is stretched, and through the transition effect of the conical surface, multiple locking rods 19 are forced to slide to the limit position and retract into the movable groove 17. Then, the slide bar 18 is released, and the tension spring 20 is reset to the natural state. The slide bar 18 slides to the initial position, and the slide bar 18 first contacts and overlaps with the wedge surface, and through the transition effect of the wedge surface, it forces The locking rod 19 slides to the initial position, and then the sliding rod 18 contacts and overlaps with the plane of the locking rod 19, and the conical surface of the locking rod 19 contacts and overlaps with one of the ring plates 11. Due to the obstruction of the locking rod 19, the insertion rod 14 cannot withdraw from the through-hole, so as to lock the insertion rod 14. On the contrary, the sliding rod 18 is slid to the limit position, the tension spring 20 is stretched, and then the insertion rod 14 is withdrawn from the through-hole. In this process, through the transition effect of the conical surface, multiple locking rods 19 are forced to slide to the limit position and are all retracted into the movable groove 17. Then the sliding rod 18 is released, the tension spring 20 returns to its natural state, and multiple locking rods 19 slide to the initial position, thereby unlocking the insertion rod 14.

[0035] like Figure 11 As shown, in some embodiments, a fixing rod 21 is provided on the insertion rod 14, and the fixing rod 21 is fixed on the insertion rod 14. A locking portion is provided between the fixing rod 21 and the slide rod 18, and the slide rod 18 is locked or unlocked by the locking portion;

[0036] Referring to the above, when the insertion rod 14 is movably inserted in the through hole, the slide rod 18 can be slid to the extreme position in advance, the tension spring 20 is stretched, and the slide rod 18 is locked by the locking part to facilitate subsequent operations. Thereafter, the slide rod 18 is unlocked by the locking part, the tension spring 20 is restored to its natural state, and the slide rod 18 slides to its initial position. Conversely, when the insertion rod 14 is unlocked, the above operation can be repeated, which is more convenient to use.

[0037] like Figure 11 As shown, in some embodiments, the locking portion includes a hook 22 provided on the fixed rod 21, the hook 22 is fixed on the fixed rod 21, and a hanging ring 23 is hingedly connected to the slide bar 18 and engaged with the hook 22;

[0038] Referring to the above, when the slide bar 18 is slid to the extreme position in advance and the tension spring 20 is stretched, the hanging ring 23 is rotated and hooked on the hook 22 to lock the slide bar 18. Thereafter, the hanging ring 23 is rotated and disengaged from the hook 22, and the slide bar 18 slides to the initial position, thereby unlocking the slide bar 18.

[0039] like Figure 5-Figure 6 As shown, in some embodiments, a first sealed cavity 24 and a second sealed cavity 25 are respectively formed at both ends of the outer tube 2, and a sealing member is provided between the first sealed cavity 24 and the second sealed cavity 25;

[0040] Referring to the above, when the two outer tubes 2 are connected end to end, the first sealed cavity 24 is connected to the second sealed cavity 25, and the first sealed cavity 24 and the second sealed cavity 25 are sealed by the sealing member to form a sealing structure between the two outer tubes 2, thereby further improving the sealing performance.

[0041] like Figure 5-Figure 6 As shown, in some embodiments, the sealing member includes a first sealing ring 26 disposed in the first sealing cavity 24 and plugged into the second sealing cavity 25. The first sealing ring 26 is horizontally oriented and fixedly disposed in the first sealing cavity 24. A groove 27 is formed on the first sealing ring 26. A second sealing ring 28 plugged into the groove 27 is disposed in the second sealing cavity 25. The second sealing ring 28 is horizontally oriented and fixedly disposed in the second sealing cavity 25.

[0042] Referring to the above, when the two outer tubes 2 are connected end to end, the first sealing ring 26 corresponds to and is inserted into the second sealing cavity 25, and the second sealing ring 28 corresponds to and is inserted into the groove 27, thereby forming a multiple sealing structure to improve the sealing performance.

[0043] like Figure 4-Figure 6 As shown, in some embodiments, the sealing ring 16, the first sealing ring 26 and the second sealing ring 28 are all configured with guiding inclined surfaces;

[0044] Referring to the above, when in use, the setting of the guiding slope makes it easier for the sealing ring 16 to be inserted into the sealing groove 15, the first sealing ring 26 to be inserted into the second sealing cavity 25, and the second sealing ring 28 to be inserted into the groove 27, making it more convenient to use.

[0045] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined casing for reservoir fracturing, comprising an inner and outer oil pipe (1) and an outer pipe (2), characterized in that: The oil pipe (1) is respectively provided with a first connecting groove (3) and a second connecting groove (4) at both ends. A clamping groove (5) is provided in the first connecting groove (3). A first magnet (6) is provided in the clamping groove (5). A clamping block (7) plugged into and matched with the clamping groove (5) is provided in the second connecting groove (4). A second magnet (8) magnetically attracted to the first magnet (6) is provided on the clamping block (7). Both ends of the outer tube (2) are provided with an annular cavity (9) and an annular groove that are in communication. (10), further comprising two annular plates (11) hinged to each other and enclosed in the annular cavity (9), the annular plates (11) being provided with two arcuate strips (12) both plugged into the annular groove (10), the two annular plates (11) being provided with through holes (13), the two through holes (13) being connected to form a through hole, an insertion rod (14) being movably inserted into the through hole, the insertion rod (14) being provided with a locking member, and the insertion rod (14) being locked or unlocked by the locking member.

2. The combined casing for reservoir fracturing according to claim 1, characterized in that: A sealing groove (15) is provided at one end of the oil pipe (1), and a sealing ring (16) is provided at the other end for plugging and matching with the sealing groove (15).

3. The combined casing for reservoir fracturing according to claim 1, characterized in that: The locking member comprises a movable groove (17) provided on the insertion rod (14), a sliding rod (18) and a plurality of locking rods (19) being slidably arranged in the movable groove (17), a tension spring (20) being arranged between the sliding rod (18) and the insertion rod (14), one end of the locking rod (19) being conical in structure and being in contact with and overlapping one of the ring plates (11), and the other end being wedge-shaped in structure and being in contact with and overlapping the sliding rod (18).

4. The combined casing for reservoir fracturing according to claim 3, characterized in that: A fixing rod (21) is provided on the insertion rod (14), and a locking portion is provided between the fixing rod (21) and the slide rod (18), and the slide rod (18) is locked or unlocked by the locking portion.

5. The combined casing for reservoir fracturing according to claim 4, characterized in that: The locking portion comprises a hook (22) arranged on the fixed rod (21), and a hanging ring (23) is hingedly connected to the sliding rod (18) and is engaged with the hook (22).

6. The combined casing for reservoir fracturing according to claim 2, characterized in that: A first sealed cavity (24) and a second sealed cavity (25) are respectively provided at both ends of the outer tube (2), and a sealing member is provided between the first sealed cavity (24) and the second sealed cavity (25).

7. The combined casing for reservoir fracturing according to claim 6, characterized in that: The sealing member comprises a first sealing ring (26) arranged in a first sealing cavity (24) and plugged into a second sealing cavity (25); a groove (27) is provided on the first sealing ring (26); and a second sealing ring (28) is arranged in the second sealing cavity (25) and plugged into the groove (27).

8. The combined casing for reservoir fracturing according to claim 7, characterized in that: The sealing ring (16), the first sealing ring (26) and the second sealing ring (28) are all configured with guiding inclined surfaces.

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