Small casing suspension device for well repair

Abstract

The utility model discloses a small casing suspension device for well repair, and particularly relates to the technical field of oil field well repair tools, the small casing suspension device comprises an upper seat and a base, a suspension short section is arranged on the upper seat, a well casing is arranged on the base, a small casing is arranged in the well casing, and one end of the small casing extends into the upper seat; a plurality of rotating seats are rotationally connected to the base, lifting assemblies are rotationally connected to the rotating seats, pressing plates used for being connected with the upper seat in a pressing mode are arranged on the lifting assemblies, positioning telescopic assemblies are arranged on the pressing plates, and the positioning telescopic assemblies are movably connected with the upper seat; the base is provided with an outer gear ring used for driving the lifting assembly to rotate, and the base is further provided with a transmission assembly used for driving the outer gear ring to rotate. According to the utility model, the technical problem that the assembly efficiency and the well repair progress are reduced due to the fact that the upper seat and the base are assembled by a plurality of bolts during the hanging operation of the small casing in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield workover tool technical field, concretely relates to a small casing hanger for workover. BACKGROUND

[0002] Linpan oilfield belongs to layered complex small fault block oilfield, and is characterized by many faults, complex reservoir types, and the influence of sand production, corrosion and high pressure water injection during development, and the casing damage of oil and water wells is increasing, which seriously affects the normal development of Linpan oilfield. According to the statistical data, more than 600 casing damage wells have been found in Linpan, and more than 300 casing damage wells are waiting for repair. The casing damage wells increase by 50-60 wells per year. With the development of Linpan oilfield in the later period, in order to improve the single well production and the ultimate recovery, the repair of casing damage well is more and more important, and the small casing hanger technology for repairing casing damage well is also more and more valued and used. The small casing hanger technology is mainly suitable for casing damage, corrosion damage, long casing damage section, high pressure water injection, and other casing damage conditions.

[0003] For example, patent announcement No. CN203783501U discloses a small casing hanger for workover. The small casing hanger for workover comprises an upper seat and a base, the upper seat is provided with a mounting hole for fixing and assembling a small casing, the base is provided with a matching hole for fixedly matching with a well casing, and the upper seat and the base are detachably fixedly connected. Since the upper seat of the small casing hanger for workover is provided with a mounting hole for fixing and assembling a small casing, the base is provided with a matching hole for fixedly matching with a well casing, and the upper seat and the base are detachably fixedly connected, therefore, when in use, the base can be fixed on the corresponding well casing, the small casing can be fixed on the upper seat, and when the casing repair work is completed, only the upper seat and the base need to be disassembled to carry out other work, thereby saving the welding and cutting links, and the problem of inconvenient disassembly of the existing small casing hanger in use is solved.

[0004] In the above patent, the inventor believes that the dismounting mode of the upper seat and the base through bolt connection needs at least 4-6 groups of bolt accessories, and the operation of tightening the bolts one by one reduces the assembly efficiency of the upper seat and the base, and affects the workover progress. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a small casing hanger for workover to solve the technical problem of the reduction of assembly efficiency and workover progress caused by the assembly of the upper seat and the base by multiple bolts in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0007] A kind of small casing suspension device for workover, including upper seat and base, the upper seat is provided with suspension nipple, the base is provided with well casing, the well casing is provided with small casing, and one end of small casing extends into the upper seat;

[0008] The base is rotatably connected with a plurality of rotating seats, the rotating seat is rotatably connected with a lifting assembly, the lifting assembly is provided with a pressing plate for pressing the upper seat, the pressing plate is provided with a positioning telescopic assembly, and the positioning telescopic assembly is movably connected with the upper seat;

[0009] The base is provided with an outer gear ring for driving the rotation of the lifting assembly, and the base is further provided with a transmission assembly for driving the rotation of the outer gear ring.

[0010] Further, the upper seat is provided with a mounting hole for fixing the small casing, the base is provided with a fixing hole for fixedly cooperating with the well casing, the lower end of the suspension nipple is provided in a tapered structure, the upper part of the mounting hole is provided with a reverse tapered section complementary to the lower end of the suspension nipple, and the lower end of the suspension nipple is further provided with an external thread for cooperating with the small casing.

[0011] Further, the periphery of the base is provided with a working groove one, and the rotating seat is rotatably connected in the working groove one, the lifting assembly includes an internal thread cylinder, the internal thread cylinder is rotatably connected on the rotating seat, the rotating seat is screwedly connected with a threaded block, the threaded block is fixedly connected with a pull rod, and the pressing plate is fixedly connected at one end of the pull rod.

[0012] Further, the periphery of the upper seat is provided with an avoiding groove for avoiding the pull rod.

[0013] Further, one end of the internal thread cylinder is fixedly connected with a limiting ring, and the pull rod is slidingly connected on the limiting ring.

[0014] Further, the positioning telescopic assembly includes a telescopic rod, the telescopic rod is fixedly connected to the upper end surface of the pressing plate, one end of the telescopic rod is fixedly connected with a support plate, one end of the lower surface of the support plate is fixedly connected with a positioning rod, and the upper seat is provided with a slot for inserting the positioning rod.

[0015] Further, the upper end surface of the base is provided with a ring groove, the outer gear ring is rotatably connected in the ring groove, the working groove one is communicated with the ring groove, the outer side of the internal thread cylinder is fixedly connected with a gear one, and the gear one is meshingly connected on the outer gear ring.

[0016] Further, a working groove two is arranged on the periphery of the base, the working groove two is communicated with the ring groove, the transmission assembly comprises a shaft rod, the shaft rod is rotationally connected in the working groove two, one end of the shaft rod is fixedly connected with a gear two, the other end of the shaft rod is fixedly connected with a hexagonal head, the gear two is meshingly connected on the outer gear ring.

[0017] The utility model has the advantages of:

[0018] The well repairing small casing suspension device is folded to the upper seat position by the rotating lifting assembly on the base, the position of the pressing plate is vertically limited by the positioning telescopic assembly, the outer gear ring is driven to rotate by the transmission assembly, the outer gear ring cooperatively engages with the plurality of gears one to drive the plurality of lifting assemblies to perform the tightening action of spiral descending, the plurality of pressing plates can quickly act on the upper seat to perform the pressing operation, the stability of the assembly of the upper seat and the base is ensured, and the assembly efficiency of the upper seat and the base is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be obtained according to the provided drawings without creating labor.

[0020] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the utility model, so they do not have technical substantial significance, any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that the utility model can produce, should still fall within the scope of the technical content disclosed by the utility model.

[0021] Figure 1 The structure schematic view of the well repairing small casing suspension device provided by the utility model is shown in the figure;

[0022] Figure 2 The structure schematic view of the well repairing small casing suspension device provided by the utility model is shown in the figure;

[0023] Figure 3 The structure schematic view of the well repairing small casing suspension device provided by the utility model is shown in the figure;

[0024] Figure 4 The structure schematic view of the well repairing small casing suspension device provided by the utility model is shown in the figure; Figure 3 The exploded view of the telescopic assembly is shown in the figure;

[0025] Figure 5 The utility model provides a Figure 1 The enlarged view of A part.

[0026] In the figure: 1, upper seat; 2, base; 3, hanging nipple; 4, well casing; 5, small casing; 6, rotating seat; 7, lifting assembly; 71, internal thread cylinder; 72, threaded block; 73, pull rod; 8, pressing plate; 9, positioning telescopic assembly; 91, telescopic rod; 92, support plate; 93, positioning rod; 10, gear one; 11, external gear ring; 12, transmission assembly; 121, shaft; 122, gear two; 123, hexagonal head; 13, working groove one; 14, limiting ring; 15, ring groove; 16, working groove two. DETAILED DESCRIPTION

[0027] The following specific embodiments illustrate the embodiments of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the disclosed content of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] In combination with the description of Figures 1-5 The utility model provides a small casing hanging device for well repair, including upper seat 1 and base 2, be provided with the hanging nipple 3 on upper seat 1, be provided with well casing 4 on base 2, be provided with small casing 5 in well casing 4, and the one end of small casing 5 extends to upper seat 1.

[0029] The setting of upper seat 1, base 2, hanging nipple 3, well casing 4 and small casing 5 in the application can be used for hanging small casing 5 in well repair.

[0030] In the embodiment: the mounting hole for fixing assembly small casing 5 is provided on upper seat 1, the fixing hole for fixedly cooperating with well casing 4 is provided on base 2, the lower end of hanging nipple 3 is provided in tapered structure, the upper portion of mounting hole is provided with the inverted taper section that is complementary with the lower end of hanging nipple 3, and the lower end of hanging nipple 3 is further provided with the external thread that cooperates with small casing 5.

[0031] The periphery of mounting hole can weld small casing 5 and upper seat 1 by welding, and base 2 can be fitted on well casing 4 by welding.

[0032] In the embodiment: a plurality of rotating seats 6 are rotatably connected on base 2, the periphery of base 2 is provided with working groove one 13, and rotating seat 6 is rotatably connected in working groove one 13.

[0033] The rotating seat 6 is rotatably connected in the working groove I 13 through a damping rotating shaft, so that the rotating seat 6 has damping property when performing angle adjustment.

[0034] In the embodiment, the rotating seat 6 is rotatably connected with the lifting assembly 7, the lifting assembly 7 comprises an internally threaded cylinder 71 rotatably connected with the rotating seat 6, and a threaded block 72 is threadedly connected in the rotating seat 6, and a pull rod 73 is fixedly connected on the threaded block 72.

[0035] The internally threaded cylinder 71 is controlled to rotate, and the threaded block 72 can be lifted and lowered through threaded transmission in the internally threaded cylinder 71 under the limitation of the rotating direction of the threaded block 72, so that the pull rod 73 can be lifted and lowered synchronously with the threaded block 72, and the number of the rotating seat 6 and the working groove I 13 is the same as the number of the lifting assembly 7.

[0036] In the embodiment, one end of the internally threaded cylinder 71 is fixedly connected with a limiting ring 14, and the pull rod 73 is slidingly connected on the limiting ring 14.

[0037] The limiting ring 14 can prevent the threaded block 72 from being pulled out of the internally threaded cylinder 71, and can facilitate adjustment of the highest position of the threaded block 72 in the internally threaded cylinder 71, so that the initial height consistency of the plurality of pull rods 73 can be ensured.

[0038] In the embodiment, the periphery of the upper seat 1 is provided with avoiding grooves for avoiding the pull rod 73.

[0039] When the lifting assembly 7 is adjusted to a vertical state, the pull rod 73 can be located in the avoiding groove, and the number of the avoiding grooves is the same as the number of the pull rod 73.

[0040] In the embodiment, the lifting assembly 7 is provided with a pressing plate 8 for pressing the upper seat 1, and the pressing plate 8 is fixedly connected at one end of the pull rod 73.

[0041] The liftable pull rod 73 can drive the pressing plate 8 to descend, the bottom of the pressing plate 8 can be treated to prevent slipping, so that the pressing plate 8 can be pressed on the upper seat 1 to ensure the tightness of the connection between the upper seat 1 and the base 2.

[0042] In the embodiment, the pressing plate 8 is provided with a positioning telescopic assembly 9, the positioning telescopic assembly 9 is movably connected with the upper seat 1, the positioning telescopic assembly 9 comprises a telescopic rod 91 fixedly connected with the upper end surface of the pressing plate 8, one end of the telescopic rod 91 is fixedly connected with a supporting plate 92, one end of the lower surface of the supporting plate 92 is fixedly connected with a positioning rod 93, and the upper seat 1 is provided with a slot for inserting the positioning rod 93.

[0043] Before the descending action of the lifting assembly 7 needs to be controlled, the telescopic rod 91 arranged in a rectangular structure is used to control the height of the telescopic control positioning rod 93, when the pull rod 73 is in a vertical state, the pull rod 73 is prevented from being deflected by inserting the positioning rod 93 into the slot, so that the rotation of the inner threaded cylinder 71 can control the linear descent of the pull rod 73.

[0044] In the embodiment, the base 2 is provided with an outer tooth ring 11 for driving the lifting assembly 7 to rotate, the upper end surface of the base 2 is provided with a ring groove 15, the outer tooth ring 11 is rotatably connected in the ring groove 15, the working groove one 13 is in communication with the ring groove 15, the outer side of the inner threaded cylinder 71 is fixedly connected with a gear one 10, and the gear one 10 is meshingly connected on the outer tooth ring 11.

[0045] When the inner threaded cylinder 71 is vertically adjusted through the rotating seat 6, the gear one 10 on the inner threaded cylinder 71 can be butt-jointed on the outer tooth ring 11, and then the rotation of the outer tooth ring 11 can control the inner threaded cylinder 71 to drive the threaded block 72 after the rotation angle of the inner threaded cylinder 71 is limited.

[0046] In the embodiment, the base 2 is further provided with a transmission assembly 12 for driving the outer tooth ring 11 to rotate, the periphery of the base 2 is provided with a working groove two 16, the working groove two 16 is in communication with the ring groove 15, the transmission assembly 12 comprises a shaft rod 121, the shaft rod 121 is rotatably connected in the working groove two 16, one end of the shaft rod 121 is fixedly connected with a gear two 122, the other end of the shaft rod 121 is fixedly connected with a hexagonal head 123, and the gear two 122 is meshingly connected on the outer tooth ring 11.

[0047] The hexagonal head 123 is located below the base 2, and the gear two 122 is located in the working groove two 16, in use, the hexagonal head 123 can be rotated by cooperating with an external rotating tool such as a wrench, the rotation of the hexagonal head 123 can make the gear two 122 meshingly rotate the outer tooth ring 11, after the angle of the plurality of lifting assemblies 7 is limited, the rotation of the outer tooth ring 11 can drive the inner threaded cylinder 71 to rotate through the gear one 10, and then the inner threaded cylinder 71 and the threaded block 72 can drive the pressing plate 8 to quickly press the upper seat 1 arranged above the base 2, so that the assembly efficiency of the upper seat 1 and the base 2 is improved, and the progress of the well repair operation is also improved.

[0048] Although the utility model has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model all belong to the scope of protection required by the utility model.

Claims

1. A liner hanger for workover operations, characterized in that, Including the upper seat (1) and the base (2), the upper seat (1) is provided with the hanging short section (3), the base (2) is provided with the well casing (4), the well casing (4) is provided with the small casing (5) in, and the small casing (5) one end extends into the upper seat (1); The base (2) is rotatably connected with a plurality of rotating seats (6), the rotating seat (6) is rotatably connected with a lifting assembly (7), the lifting assembly (7) is provided with a pressing plate (8) for pressing the upper seat (1), the pressing plate (8) is provided with a positioning telescopic assembly (9), and the positioning telescopic assembly (9) is movably connected with the upper seat (1); The base (2) is provided with an outer gear ring (11) for driving the lifting assembly (7) to rotate, and the base (2) is further provided with a transmission assembly (12) for driving the outer gear ring (11) to rotate.

2. A liner hanger for workover operations as defined in claim 1 wherein, The upper seat (1) is provided with a mounting hole for fixing the small casing (5), the base (2) is provided with a fixing hole for fixedly cooperating with the well casing (4), the lower end of the hanging short section (3) is provided in a tapered structure, the upper part of the mounting hole is provided with a reverse tapered section complementary to the lower end of the hanging short section (3), and the lower end of the hanging short section (3) is further provided with an external thread matched with the small casing (5).

3. A liner hanger for workover operations as defined in claim 1 wherein, The periphery of the base (2) is provided with a working groove one (13), the rotating seat (6) is rotatably connected in the working groove one (13), the lifting assembly (7) includes an inner threaded cylinder (71), the inner threaded cylinder (71) is rotatably connected on the rotating seat (6), the rotating seat (6) is screwedly connected with a threaded block (72), the threaded block (72) is fixedly connected with a pull rod (73), and the pressing plate (8) is fixedly connected at one end of the pull rod (73).

4. A liner hanger for workover operations as defined in claim 3 wherein, The periphery of the upper seat (1) is provided with an avoiding groove for avoiding the pull rod (73).

5. A liner hanger for workover operations as defined in claim 3 wherein, One end of the inner threaded cylinder (71) is fixedly connected with a limiting ring (14), and the pull rod (73) is slidably connected on the limiting ring (14).

6. A liner hanger for workover operations as defined in claim 1 wherein, The positioning telescopic assembly (9) includes a telescopic rod (91), the telescopic rod (91) is fixedly connected to the upper end surface of the pressing plate (8), one end of the telescopic rod (91) is fixedly connected with a supporting plate (92), one end of the lower surface of the supporting plate (92) is fixedly connected with a positioning rod (93), and the upper seat (1) is provided with a slot for inserting the positioning rod (93).

7. A liner hanger for workover operations as defined in claim 3 wherein, The upper end surface of the base (2) is provided with a ring groove (15), the outer gear ring (11) is rotatably connected in the ring groove (15), the working groove one (13) is communicated with the ring groove (15), and the outer side of the inner threaded cylinder (71) is fixedly connected with a gear one (10), and the gear one (10) is meshingly connected on the outer gear ring (11).

8. A liner hanger for workover operations as defined in claim 7, wherein, The periphery of the base (2) is provided with a working groove two (16), the working groove two (16) is communicated with the ring groove (15), the transmission assembly (12) includes a shaft rod (121), the shaft rod (121) is rotatably connected in the working groove two (16), one end of the shaft rod (121) is fixedly connected with a gear two (122), the other end of the shaft rod (121) is fixedly connected with a hexagonal head (123), the gear two (122) is meshedly connected on the outer gear ring (11).

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