CN216043652U

CN216043652U - Screw pump drainage device for coal bed gas deflecting well

Info

Publication number: CN216043652U
Application number: CN202122829615.3U
Authority: CN
Inventors: 辛世同; 马玉权; 王之迪
Original assignee: Weifang Baofeng Machinery Co ltd
Current assignee: Weifang Baofeng Machinery Co ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-03-15
Anticipated expiration: 2031-11-18

Abstract

The utility model discloses a screw pump drainage and mining device for a coal bed gas deflecting well, which comprises a ground driving device and a large wellhead cross arranged at the bottom end of the ground driving device, wherein an oil pipe is arranged at the bottom end of the large wellhead cross, a plurality of pumping rods connected end to end are arranged in the oil pipe, each two pumping rods are connected with a guide centralizer, a screw pump is arranged at the bottommost end of each pumping rod, an anchor is arranged at the bottom end of each screw pump, a gas anchor is arranged at the bottom end of each anchor, and a sand control screen pipe is arranged at the bottom end of each gas anchor. The utility model sets screw pump at the bottom of the oil pumping rod, the bottom of the screw pump is set with anchor, the bottom of the anchor is set with air anchor, the bottom of the air anchor is set with sand control screen, the pump testing period of the oil extraction device is long, generally more than one year, it can prevent the oil pumping rod and oil pipe from eccentric wear, and the oil pumping rod from bending and breaking, the screw pump also can effectively prevent air lock and sand block.

Description

Screw pump drainage device for coal bed gas deflecting well

Technical Field

The utility model relates to the technical field related to a screw pump of a coal bed gas deflecting well, in particular to a screw pump drainage and extraction device of the coal bed gas deflecting well.

Background

The coal bed gas L-shaped horizontal well has the characteristics of sectional fracturing, wide control range, high output benefit and the like, and becomes a main well type for coal bed gas development in recent years. However, the L-shaped horizontal well has great difficulty in the drainage and mining process due to factors such as large inclination angle, large change rate of the total angle, gas influence and the like. The problems of too large bending of the sucker rod, easy breakage, difficult fishing and high labor cost exist; furthermore, the L-shaped horizontal well discharging and mining process applies devices such as a jet pump, a plunger pump and the like, the eccentric wear of a sucker rod and an oil pipe is serious, sand blockage and air lock are easy to occur, the discharging and mining effect is not ideal, the production continuity is poor, and the pump is frequently operated and detected, so that the production is influenced. Therefore, the coal bed gas deflecting well screw pump drainage device is provided by improving the structure.

SUMMERY OF THE UTILITY MODEL

The utility model provides a screw pump drainage device for a coal bed gas deflecting well, which aims to solve the problems that in the prior art, a sucker rod and an oil pipe are seriously worn, sand blocking and air locking are easy to occur, the drainage and mining effect is not ideal, the production continuity is poor, and the production is influenced by frequent operation and pump detection.

In order to solve the technical problems, the utility model provides the following technical scheme:

the screw pump drainage and mining device for the coal bed gas deflecting well comprises a ground driving device and a large wellhead cross arranged at the bottom end of the ground driving device, wherein an oil pipe is arranged at the bottom end of the large wellhead cross, a plurality of pumping rods which are connected end to end are arranged in the oil pipe, each two pumping rods are connected with a guide centralizer, a screw pump is arranged at the bottommost end of each pumping rod, an anchor is arranged at the bottom end of each screw pump, a gas anchor is arranged at the bottom end of each anchor, and a sand control screen pipe is arranged at the bottom end of each gas anchor.

As a preferred technical scheme of the utility model, the oil pipe is in threaded connection with the large four-way joint of the well head, and the sucker rod is in threaded connection with the rotor in the screw pump.

As a preferred technical scheme of the utility model, the outer end of the oil pipe is provided with an oil pipe centralizer.

As a preferred technical scheme of the utility model, the sucker rod is sleeved with a sucker rod centering sleeve.

As a preferred technical scheme of the utility model, the bottom end of the large four-way of the wellhead is provided with a sleeve which is sleeved outside the oil pipe.

As a preferred technical scheme of the utility model, the sucker rod extends to the upper end of the large four-way of the wellhead and is connected with a polished rod, and the bottom end of the ground driving device is connected with the top end of the polished rod.

The utility model has the beneficial effects that:

1. according to the screw pump drainage and production device for the coal bed gas deflecting well, each two sucker rods are connected with one guide centralizer, the guide centralizers can deflect 5 degrees in any direction within the range of 360 degrees, the torque is transmitted and the bending direction of the sucker rods is matched, and the problems of abrasion between the sucker rods of the deflecting well and the wall of an oil pipe and rod breakage of the sucker rods are solved; the bottommost through the sucker rod is equipped with the screw pump, and the bottom of screw pump is equipped with the anchor, and the bottom of anchor is equipped with the gas anchor, and the bottom of gas anchor is equipped with sand control screen pipe, and this kind of row adopts the device to examine the pump cycle length, generally more than a year, prevents sucker rod and oil pipe eccentric wear to and the crooked disconnected pole of sucker rod, the screw pump still effectively prevents air lock, sand card.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic structural diagram of a screw pump drainage device of a coal bed gas deflecting well.

In the figure: 1. a sand control screen pipe; 2. a gas anchor; 3. an anchor; 4. a screw pump; 5. a guide centralizer; 6. a sucker rod centralizing sleeve; 7. a sucker rod; 8. an oil pipe; 9. an oil pipe centralizer; 10. a sleeve; 11. a big four-way of a wellhead; 12. a ground driving device.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Example (b): as shown in figure 1, the coal bed gas deflecting well screw pump drainage device comprises a ground driving device 12 and a large wellhead cross 11 arranged at the bottom end of the ground driving device 12, an oil pipe 8 is arranged at the bottom end of the large wellhead cross 11, a plurality of sucker rods 7 which are connected end to end are arranged inside the oil pipe 8, each two sucker rods 7 are connected with a guide centralizer 5, a screw pump 4 is arranged at the bottommost end of each sucker rod 7, an anchor 3 is arranged at the bottom end of each screw pump 4, a gas anchor 2 is arranged at the bottom end of each anchor 3, and a sand control screen 1 is arranged at the bottom end of each gas anchor 2.

Wherein, the oil pipe 8 is connected with the big four-way joint 11 of the well head through screw thread, and the sucker rod 7 is connected with the rotor in the screw pump 4 through screw thread, which is convenient for installation or disassembly.

Wherein, oil pipe centralizer 9 is installed to the outer end of oil pipe 8, and oil pipe centralizer 9 plays the effect of rightting oil pipe 8.

Wherein, the sucker rod 7 is sleeved with a sucker rod centering sleeve 6, and the sucker rod centering sleeve 6 can prevent the sucker rod 7 and the wall of the oil pipe 8 from wearing.

Wherein, the bottom of the big cross 11 of well head is equipped with the sleeve pipe 10 of cover setting in the outside of oil pipe 8, and the setting of sleeve pipe 10 plays fixed underground, prevents to collapse.

The sucker rod 7 extends to the upper end of the large four-way joint 11 of the wellhead and is connected with a polished rod, and the bottom end of the ground driving device 12 is connected with the top end of the polished rod.

The working principle is as follows: when in use, the ground driving device 12 provides a power source for the screw pump 4, the ground driving device 12 is connected to a rotor in the underground screw pump 4 through the sucker rod 7 and the guide centralizer 5, a plurality of S-shaped closed cavities are arranged between the rotor and a stator in the screw pump 4, the ground driving device 12 drives the rotor of the underground screw pump 4 to do planetary motion in a stator bushing through a transmission shaft, the S-shaped cavities between the rotor and the stator in the screw pump 4 are uninterruptedly spirally lifted along with the rotating surface of the rotor, the newly formed cavity below the screw pump 4 finishes the suction of liquid, and the liquid is discharged at the end part of the screw pump 4 through the spiral lifting of the rotor, thereby achieving the purpose of uninterrupted and continuous oil extraction; according to the coal bed gas deflecting well screw pump 4 drainage device, each two sucker rods 7 are connected with one guide centralizer 5, the guide centralizer 5 can deflect 5 degrees in any direction within the range of 360 degrees, the torque is transmitted and the bending direction of the sucker rods 7 is matched, and the problems that the walls of the deflecting well sucker rods 7 and an oil pipe 8 are abraded and the sucker rods 7 are broken are solved; through being equipped with screw pump 4 in sucker rod 7 bottommost, screw pump 4's bottom is equipped with anchor 3, and anchor 3's bottom is equipped with gas anchor 2, and gas anchor 2's bottom is equipped with sand control screen pipe 1, and this kind of row adopts the device to examine the pump cycle length, generally more than a year, prevents sucker rod and oil pipe eccentric wear to and the crooked disconnected pole of sucker rod, the screw pump still effectively prevents air lock, sand card.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The screw pump drainage and production device for the coal bed gas deflecting well comprises a ground driving device (12) and a large wellhead four-way (11) arranged at the bottom end of the ground driving device (12), and is characterized in that an oil pipe (8) is arranged at the bottom end of the large wellhead four-way (11), a plurality of end-to-end sucker rods (7) are arranged inside the oil pipe (8), every two sucker rods (7) are connected with a guide centralizer (5), a screw pump (4) is arranged at the bottommost end of each sucker rod (7), an anchor (3) is arranged at the bottom end of each screw pump (4), a gas anchor (2) is arranged at the bottom end of each anchor (3), and a sand-prevention screen pipe (1) is arranged at the bottom end of each gas anchor (2).

2. The screw pump drainage and production device of the coal bed gas deflecting well according to claim 1, characterized in that the oil pipe (8) is in threaded connection with a large four-way (11) of the well head, and the sucker rod (7) is in threaded connection with a rotor in the screw pump (4).

3. The screw pump drainage device of the coal bed methane deflecting well according to claim 1, characterized in that an oil pipe centralizer (9) is installed at the outer end of the oil pipe (8).

4. The screw pump drainage device of the coal bed methane deflecting well according to claim 1, characterized in that the sucker rod (7) is sleeved with a sucker rod centering sleeve (6).

5. The screw pump drainage and production device of the coal bed methane deflecting well according to claim 1, characterized in that the bottom end of the large four-way joint (11) of the well head is provided with a sleeve (10) sleeved outside the oil pipe (8).

6. The screw pump drainage and production device of the coal bed methane deflecting well according to claim 1, characterized in that the sucker rod (7) extends to the upper end of the large four-way joint (11) of the well head and is connected with a polished rod, and the bottom end of the ground driving device (12) is connected with the top end of the polished rod.