CN222228522U - A rod pump drainage gas production device for flushing coal powder in coalbed methane wells - Google Patents

Abstract

The utility model provides a have pole pump drainage gas production device of flushing coal bed gas well buggy, the sucker rod pump is plunger pump or screw pump, the stator part of sucker rod pump is connected in the lower part of oil pipe, the active cell part of sucker rod pump is connected in the lower part of sucker rod, uniflow valve connection is in the lower part of outer oil pipe, uniflow valve are in the pit earlier, oil pipe, the stator part of sucker rod pump is in outer oil pipe again, the sucker rod pump is located the uniflow valve on, the sucker rod is in oil pipe again. The annular space between the outer layer oil pipe and the oil pipe can be used as a gas production channel, the annular space between the outer layer oil pipe and the sleeve pipe can be used as a water-doped well flushing channel, the aim of flushing and producing gas at the same time can be fulfilled, if the situation that the sucker rod pump is blocked by coal dust occurs, well flushing liquid can be pumped into the annular space between the outer layer oil pipe and the oil pipe, the well flushing liquid can not enter a stratum under the action of the uniflow valve, and the aims of blocking and unblocking the tubular column can be fulfilled.

Description

Sucker-rod pump drainage gas production device for flushing coal bed gas well coal dust

Technical Field

The utility model belongs to drainage gas production equipment of a coal-bed gas well, and relates to a drainage gas production device with a sucker rod pump for flushing coal dust of the coal-bed gas well.

Background

In the drainage and gas production process of coal bed gas, coal dust is inevitably introduced into a shaft along with gas and water, so that underground drainage and production equipment and drainage and production channels are blocked frequently, and the normal production of a coal bed gas well is affected.

In order to prevent underground drainage equipment and drainage channels of coal-bed gas wells from being blocked by pulverized coal, people install a liquid inlet of a sucker rod pump (a plunger pump or a screw pump) below a coal bed, and regularly water-mixing and pulverized coal flushing are carried out from an oil sleeve annulus (a gas production channel). The water mixing displacement does not exceed the displacement of the drainage device so as to prevent well fluid from entering the producing layer. The water mixing process for flushing the pulverized coal has the advantages that the water mixing channel occupies the drainage channel during water mixing, no gas is produced, and the water mixing time is difficult to grasp.

When the underground drainage and production equipment and drainage and production channels are blocked by coal dust in the drainage and production process, circulation is difficult to establish without pipe column flushing, well entering liquid can enter into a production layer, a reservoir is polluted, and the yield is reduced.

After underground drainage equipment and drainage channels are blocked, the drainage pipe column and the drainage equipment are usually required to be lifted out, and then the pipe column is put into the well to drag for pulverized coal operation, or the pipe column is put into a flushing pipe to perform negative pressure pulverized coal flushing operation, so that the cost is high and the well stopping time is long.

Therefore, the coal bed gas is drained and produced, the existing water-mixing flushing method is used for preventing underground drainage equipment and drainage channels from being blocked by coal dust, no gas is produced during water-mixing well flushing, the time of water-mixing well flushing is difficult to grasp, and circulation is difficult to establish when a pipe column is not blocked or unblocked.

Disclosure of utility model

The utility model aims to design a sucker-rod pump drainage gas production device for flushing coal bed gas well coal dust, which can realize gas production while flushing a well and can prevent a pipe column from being blocked and unblocked.

The utility model aims at realizing the purposes that the oil pipe and the oil pumping rod pump comprise an oil pipe, an oil pumping rod and an oil pumping rod pump, wherein the oil pumping rod pump is a plunger pump or a screw pump, a stator part of the oil pumping rod pump is connected to the lower part of the oil pipe, a rotor part of the oil pumping rod pump is connected to the lower part of the oil pumping rod, the oil pumping rod pump further comprises an outer layer oil pipe and a uniflow valve, the uniflow valve is connected to the lower part of the outer layer oil pipe, the outer layer oil pipe and the uniflow valve are firstly arranged in a well, the stator part of the oil pipe and the oil pumping rod pump are arranged in the outer layer oil pipe, the oil pumping rod pump is arranged above the uniflow valve, and the oil pumping rod is arranged in the oil pipe.

The utility model has the beneficial effects that the annular space between the outer layer oil pipe and the oil pipe can be used as a gas production channel, the annular space between the outer layer oil pipe and the sleeve can be used as a water-doped well flushing channel, well flushing liquid and production layer fluid are mixed and then washed and carry deposited pulverized coal to be discharged through the check valve, gas is separated and then discharged to the ground through the gas production channel, and pulverized coal liquid is pressurized by the sucker rod pump and then discharged to the ground through the oil pipe, so that the aims of preventing underground extraction equipment and the extraction channel from being blocked by pulverized coal without stopping production and water-doped well flushing are achieved. If the pumping rod pump is blocked, the well flushing liquid is pumped into the annular space between the outer layer oil pipe and the oil pipe, the check valve can hold high pressure, and the pumping rod pump and the oil pipe can be cleaned, so that the purposes of blocking and unblocking the pipe column can be achieved. When the pump is checked, the annular space between the outer layer oil pipe and the oil pipe is filled with clean water, and the check valve is closed under the pressure of the liquid column, so that blowout can be prevented, and well entering liquid does not enter a production layer.

Drawings

Fig. 1 is a structural diagram of the present utility model.

Detailed Description

An embodiment of the present utility model will be described with reference to fig. 1.

As can be seen from fig. 1, the embodiment of the utility model comprises an oil pipe 2, a sucker rod 3 and a sucker rod pump 4, wherein the sucker rod pump 4 is a plunger pump or a screw pump, a stator part of the sucker rod pump 4 is connected to the lower part of the oil pipe 2, a rotor part of the sucker rod pump 4 is connected to the lower part of the sucker rod 3, the utility model further comprises an outer layer oil pipe 1 and a check valve 5, the check valve 5 is connected to the lower part of the outer layer oil pipe 1, the outer layer oil pipe 1 and the check valve 5 are firstly arranged in a well, the stator parts of the oil pipe 2 and the sucker rod pump 4 are arranged in the outer layer oil pipe 1, the sucker rod pump 4 is arranged above the check valve 5, and the sucker rod 3 is arranged in the oil pipe 2.

The single flow valve 5 is positioned under the production layer, or a tail pipe is connected under the single flow valve 5, the bottom of the tail pipe is provided with a liquid inlet, and the liquid inlet at the bottom of the tail pipe is positioned under the production layer.

When the water mixing well washing is carried out in the annular space between the outer layer oil pipe 1 and the casing pipe, the water mixing displacement is smaller than the displacement of the drainage and production equipment, so that the production layer fluid can keep the original flowing state and enter the shaft, and the well entering fluid does not enter the production layer.

In order to reduce the influence of the gas on the sucker rod pump 4, a gas anchor may be connected below the sucker rod pump 4, and the gas separated by the gas anchor is discharged to the ground from the annular space between the oil pipe 2 and the outer oil pipe 1.

Claims (1)

1. A sucker rod pump drainage gas extraction device for flushing coal powder in a coalbed methane well, comprising an oil pipe (2), a sucker rod (3), and a sucker rod pump (4), wherein the sucker rod pump (4) is a plunger pump or a screw pump, wherein a stator portion of the sucker rod pump (4) is connected to the lower portion of the oil pipe (2), and a mover portion of the sucker rod pump (4) is connected to the lower portion of the sucker rod (3). The device is characterized in that it also comprises an outer oil pipe (1) and a check valve (5), wherein the check valve (5) is connected to the lower portion of the outer oil pipe (1), wherein the outer oil pipe (1) and the check valve (5) are first lowered into the well, and then the oil pipe (2) and the stator portion of the sucker rod pump (4) are lowered into the outer oil pipe (1), the sucker rod pump (4) is located above the check valve (5), and then the sucker rod (3) is lowered into the oil pipe (2).