A deep well sand cleaning system

Abstract

The present invention relates to a deep well sand cleaning system, including a sand cleaning self-sealing packer, the sand cleaning self-sealing packer includes a bridge joint, a bridge outer tube and a bridge inner tube, the bottom end of the bridge inner tube is connected with a plurality of inner oil pipes connected in series in sequence through a pipe thread, and the bottom end of the lower joint of the wrist guard is connected with a plurality of outer oil pipes connected in series in sequence through a pipe thread; the bottom end of the outer oil pipe is connected with a sealing extension pipe, the sealing extension pipe includes an extended outer tube and an extended inner tube, the bottom end of the sealing extension pipe is connected with a sand sucker, the sand sucker includes an outer tube, the interior of the outer tube is provided with a diffusion tube mutually plugged with the extended inner tube, the top end of the outer tube is connected with the extended outer tube through a thread, a lower joint is fixed in the bottom port of the outer tube, and a bridge tube connected with the diffusion tube is fixed in the top port of the lower joint. The deep well sand cleaning system of the present invention has a reasonable structural design, uses high-speed flow to generate low pressure to suck the sand at the bottom of the well into the inner oil pipe, and automatically lifts it to the ground, and is easy to operate.

Description

Technical Field

[0001] The invention relates to a deep well sand cleaning system. Background Art

[0002] In the oilfield production process, sand production is an inevitable problem. At present, the main oil well sand flushing processes include conventional tubing sand flushing, concentric tubing sand flushing, and continuous tubing sand flushing. For deep wells with low bottom hole pressure, conventional tubing sand flushing and continuous tubing sand flushing cannot establish circulation, and the sand flushing fluid is lost; concentric tubing sand flushing is not suitable for deep wells due to the large friction resistance of the pipe string. Therefore, a deep well sand cleaning system is urgently needed. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a deep well sand cleaning system, which utilizes high-speed flow to generate low pressure to lift the sand at the bottom of the well to the ground.

[0004] The deep well sand cleaning system of the present invention comprises a sand cleaning self-sealing packer, which comprises a bridge joint, a bridge outer tube and a bridge inner tube, the bridge joint is threadedly connected to the bridge outer tube, the bridge inner tube is threadedly connected to the bridge joint, and an oil well self-sealing device fixed by a lower joint of a protective bowl is arranged on the outer wall of the bridge outer tube; a plurality of inner oil pipes connected in series in sequence are connected at the bottom end of the bridge inner tube by pipe threads, and a plurality of outer oil pipes connected in series in sequence are connected at the bottom end of the lower joint of the wrist guard by pipe threads; the outer oil pipes are connected in series in sequence by pipe threads. The bottom end of the tube is connected with a sealed extension tube, which includes an extended outer tube and an extended inner tube. The extended outer tube is connected with the outer oil tube through a thread, and the bottom end of the inner oil tube is inserted into the extended inner tube. The bottom end of the sealed extension tube is connected with a sand absorber, which includes an outer tube, and a diffusion tube is provided inside the outer tube which is plugged into the extended inner tube. The top end of the outer tube is connected with the extended outer tube through a thread, a lower joint is fixed in the bottom port of the outer tube, and a bridge tube connected with the diffusion tube is fixed in the top port of the lower joint.

[0005] In the above structure, a plurality of power fluid inlet holes are provided on the outer wall of the bridge joint.

[0006] In the above structure, the oil well self-sealing device includes a first leather cup, a protective cup and a second leather cup. The bottom end of the first leather cup is fixed by a wrist guard. The second leather cup is arranged on the outer wall of the protective cup. The bottom end of the second leather cup is fixed by a lower joint of the wrist guard.

[0007] In the above structure, a plurality of first extension tube sealing rings are provided on the inner wall of the top port of the extension inner tube, and a plurality of second extension tube sealing rings are provided on the outer wall of the bottom port of the extension inner tube.

[0008] In the above structure, a filter chamber is provided inside the lower joint, a sand stirring liquid outlet hole is provided in the tube wall of the lower joint on one side of the filter chamber, the bottom end of the lower joint is a conical structure, and a plurality of evenly distributed stone-proof holes are provided on the outer wall of the lower joint.

[0009] In the above structure, a lifting nozzle is fixed in the top port of the bridge tube, a liquid inlet hole is provided on the outer wall of the bridge tube, and a bridge-type liquid suction hole that passes through from top to bottom is provided on the tube wall of the bridge tube on one side of the lifting nozzle. The top end of the bridge-type liquid suction hole is connected to the interior of the diffuser, and the bottom end of the bridge-type liquid suction hole is connected to the internal cavity of the top port of the lower joint.

[0010] In the above structure, a flow dividing cavity is formed between the outer wall of the diffusion tube and the inner wall of the outer cylinder.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the deep well sand cleaning system of the present invention has a reasonable structural design, the power fluid is injected into the diversion cavity in sequence from the outer wall of the bridge joint, and the high-speed flow is used to generate low pressure to suck the sand at the bottom of the well into the inner oil pipe and automatically lift it to the ground, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a deep well sand cleaning system according to an embodiment of the present invention;

[0013] Figure 2 It is a structural schematic diagram of a sand cleaning self-sealing packer in a deep well sand cleaning system according to an embodiment of the present invention;

[0014] Figure 3 It is a structural schematic diagram of a sealing extension pipe in a deep well sand cleaning system according to an embodiment of the present invention;

[0015] Figure 4 It is a structural schematic diagram of a sand absorber in a deep well sand cleaning system according to an embodiment of the present invention.

[0016] In the figure:

[0017] 1. Sand-clearing self-sealing packer; 101. Bridge joint; 102. Bridge outer tube; 103. Bridge inner tube; 104. Protective bowl lower joint; 105. Power fluid inlet hole; 2. Oil well self-sealing device; 201. First leather cup; 202. Protective bowl; 203. Second leather cup; 3. Inner oil pipe; 4. Outer oil pipe; 5. Sealing extension pipe; 501. Extended outer tube; 502. Extended inner tube; 503. First extension pipe sealing ring; 504. Second extension pipe sealing ring; 6. Sand absorber; 601. Outer tube; 602. Diffuser; 603. Lower joint; 604. Bridge tube; 605. Filter chamber; 606. Sand stirring liquid outlet hole; 607. Stone prevention hole; 608. Bridge tube; 609. Liquid inlet hole; 610. Bridge liquid suction hole; 611. Diverter chamber. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] like Figure 1-4 As shown, a deep well sand cleaning system comprises a sand cleaning self-sealing packer 1, wherein the sand cleaning self-sealing packer 1 comprises a bridge joint 101, a bridge outer tube 102 and a bridge inner tube 103, wherein the bridge joint 101 is threadedly connected to the bridge outer tube 102, and the bridge inner tube 103 is threadedly connected to the bridge joint 101, and an oil well self-sealing device 2 fixed by a protective bowl lower joint 104 is arranged on the outer wall of the bridge outer tube 102; a plurality of inner oil pipes 3 connected in series in sequence are connected at the bottom end of the bridge inner tube 103 by pipe threads, and a plurality of outer oil pipes 4 connected in series in sequence are connected at the bottom end of the protective arm lower joint 104 by pipe threads; the bottom ends of the outer oil pipes 4 are connected There is a sealed extension tube 5, which includes an extended outer tube 501 and an extended inner tube 502. The extended outer tube 501 is connected to the outer oil pipe 4 through a thread, and the bottom end of the inner oil pipe 3 is inserted into the extended inner tube 502. The bottom end of the sealed extension tube 5 is connected to a sand absorber 6, which includes an outer tube 601. The outer tube 601 is provided with a diffusion tube 602 that is mutually plugged with the extended inner tube 502. The top of the outer tube 601 is connected to the extended outer tube 501 through a thread, and a lower joint 603 is fixed in the bottom port of the outer tube 601, and a bridge tube 604 connected to the diffusion tube 602 is fixed in the top port of the lower joint 603.

[0020] In the above structure, a plurality of power fluid inlet holes 105 are provided on the outer wall of the bridge joint 101 .

[0021] In the above structure, the oil well self-sealing device 2 includes a first leather cup 201, a protective cup 202 and a second leather cup 203. The bottom end of the first leather cup 201 is fixed by the wrist guard 202. The second leather cup 203 is arranged on the outer wall of the protective cup 202. The bottom end of the second leather cup 203 is fixed by the lower joint 104 of the wrist guard.

[0022] In the above structure, a plurality of first extension tube sealing rings 503 are provided on the inner wall of the top end of the extension inner tube 502 , and a plurality of second extension tube sealing rings 504 are provided on the outer wall of the bottom end of the extension inner tube 502 .

[0023] In the above structure, a filter chamber 605 is provided inside the lower joint 603, and a sand stirring liquid outlet hole 606 that passes through from top to bottom is provided in the tube wall of the lower joint 603 on one side of the filter chamber 605. The bottom end of the lower joint 603 is a conical structure, and a plurality of evenly distributed stone-proof holes 607 are provided on the outer wall of the lower joint 603.

[0024] In the above structure, a lifting nozzle 608 is fixed in the top port of the bridge tube 604, a liquid inlet hole 609 is provided on the outer wall of the bridge tube 608, and a bridge-type liquid suction hole 610 that passes through from top to bottom is provided on the tube wall of the bridge tube 604 on one side of the lifting nozzle 608, the top end of the bridge-type liquid suction hole 610 is connected to the interior of the diffuser 602, and the bottom end of the bridge-type liquid suction hole 610 is connected to the internal cavity of the top port of the lower joint 603.

[0025] In the above structure, a flow dividing chamber 611 is formed between the outer wall of the diffuser tube 602 and the inner wall of the outer cylinder 601 .

[0026] When the deep well sand cleaning system of the present invention is used, the number and length of the outer oil pipes are mainly determined according to the distance between the top boundary of the oil layer and the bottom of the well. When sucking sand to the bottom of the well, the sand cleaning self-sealing packer must be above the top boundary of the oil layer. After all the outer oil pipes are lowered into the oil well, the inner oil pipe is inserted into the outer oil pipe, and the lower end of the inner oil pipe is inserted into the extended inner pipe of the sealing extension pipe and sealed by the first extension pipe sealing ring. The upper end of the inner oil pipe is connected to the bridge-type inner pipe of the sand cleaning self-sealing packer through a pipe thread. After the lower joint of the protective bowl of the sand cleaning self-sealing packer is connected to the outer oil pipe through a pipe thread, it is lowered into the oil well. The first leather cup and the second leather cup of the sand cleaning self-sealing packer are tightly attached to the oil well casing to achieve self-sealing. The top of the bridge joint is connected to the wellhead with an external oil pipe, and a self-sealing well sealer is installed at the wellhead. During construction, the power fluid inlet hole is connected to the power fluid pipeline of the pump truck, and the power fluid enters the annular cavity of the bridge-type outer tube and the bridge-type inner tube of the sand cleaning self-sealing packer through the power fluid inlet hole. After entering the diversion cavity of the sand absorber through the annular cavity of the inner and outer oil pipes, a part of the power fluid stirs up the settled sand through the sand stirring outlet hole to fluidize it. The other part of the power fluid enters the nozzle cavity of the lifting nozzle through the liquid inlet hole, and sprays upward to form a low-pressure area. The sand and water stirred up by the sand stirring outlet hole are sucked into the diffusion tube of the sand absorber through the stone prevention hole, the filter cavity and the bridge-type suction hole in turn. Then, it enters the bridge-type inner tube through the extended inner tube and the inner oil pipe. The bridge-type inner tube lifts the sand and water stirred up by the sand stirring outlet hole to the ground through the external oil pipe, completing the deep well sand cleaning operation steps.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A deep well sand cleaning system, comprising a sand cleaning self-sealing packer (1), the sand cleaning self-sealing packer (1) comprising a bridge joint (101), a bridge outer tube (102) and a bridge inner tube (103), the bridge joint (101) being threadedly connected to the bridge outer tube (102), the bridge inner tube (103) being threadedly connected to the bridge joint (101), an oil well self-sealing device (2) being fixed by a lower joint (104) of a protective bowl being arranged on the outer wall of the bridge outer tube (102); a pipe threaded connection is formed at the bottom end of the bridge inner tube (103) A plurality of inner oil pipes (3) are connected in series, and a plurality of outer oil pipes (4) are connected in series at the bottom end of the lower joint (104) of the protective bowl via pipe threads; a sealing extension pipe (5) is connected at the bottom end of the outer oil pipe (4), and the sealing extension pipe (5) comprises an extended outer pipe (501) and an extended inner pipe (502), the extended outer pipe (501) is connected to the outer oil pipe (4) via threads, the bottom end of the inner oil pipe (3) is inserted into the extended inner pipe (502), and the bottom end of the sealing extension pipe (5) is connected to a sand suction device (6), characterized in that: The sand suction device (6) comprises an outer tube (601), wherein a diffusion tube (602) plugged into the extended inner tube (502) is provided inside the outer tube (601), the top end of the outer tube (601) is connected to the extended outer tube (501) via a thread, a lower joint (603) is fixed inside the bottom end of the outer tube (601), and a bridge tube (604) connected to the diffusion tube (602) is fixed inside the top end of the lower joint (603); a filtering chamber (605) is provided inside the lower joint (603), and a sand stirring liquid outlet hole (606) penetrating from top to bottom is provided in the tube wall of the lower joint (603) on one side of the filtering chamber (605), and the bottom end of the lower joint (603) is a conical structure. A plurality of evenly distributed stone-proof holes (607) are provided on the outer wall of the lower joint (603); a lifting nozzle (608) is fixed in the top port of the bridge tube (604); a liquid inlet hole (609) is provided on the outer wall of the bridge tube (604); a bridge-type liquid suction hole (610) that passes through from top to bottom is provided on the tube wall of the bridge tube (604) on one side of the lifting nozzle (608); the top end of the bridge-type liquid suction hole (610) is communicated with the interior of the diffusion tube (602), and the bottom end of the bridge-type liquid suction hole (610) is communicated with the internal cavity of the top port of the lower joint (603); a diversion cavity (611) is formed between the outer wall of the diffusion tube (602) and the inner wall of the outer tube (601).

2. The deep well sand cleaning system according to claim 1, characterized in that: A plurality of power fluid inlet holes (105) are provided on the outer wall of the bridge joint (101).

3. The deep well sand cleaning system according to claim 1, characterized in that: The oil well self-sealing device (2) comprises a first leather cup (201), a protective cup (202) and a second leather cup (203); the bottom end of the first leather cup (201) is fixed by the protective cup (202); the second leather cup (203) is arranged on the outer wall of the protective cup (202); and the bottom end of the second leather cup (203) is fixed by a protective cup lower joint (104).

4. The deep well sand cleaning system according to claim 1, characterized in that: A plurality of first extension tube sealing rings (503) are provided on the inner wall of the top end of the extension inner tube (502), and a plurality of second extension tube sealing rings (504) are provided on the outer wall of the bottom end of the extension inner tube (502).

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