Sucker-rod pump drainage gas production device for flushing coal-bed gas well pulverized coal
By designing a rod pump drainage and gas production device, the annular space between the outer oil pipe and the oil pipe is used to achieve water-dried well washing and pressurized discharge of coal powder liquid, solving the problem of coal powder blockage, realizing gas production while washing the well, reducing the need for reducing gas The cost and time of well parking.
Patent Information
- Application Number
- CN202421029547.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-13
AI Technical Summary
During the drainage and gas mining process of coalbed methane wells, coal powder is prone to block underground drainage and mining equipment and channels, resulting in stagnation of production. The existing water-blending method does not produce gas during the well washing period, and the cost of unblocking is high and the shutdown time is long. .
Design a drainage and gas production device with a rod pump, and realizes water-dried well washing through the annular space between the outer oil pipe and the oil pipe. The well washing liquid is mixed with the layer fluid and the coal powder is flushed. The coal powder liquid is pressurized by the oil pump. Exhaust and separate the gas from the single-flow valve to ensure gas production while washing the well, and to hold the compressed and unblocked through the annular space.
It has achieved the prevention of underground equipment blockage without stopping production, reduced the time and cost of shutdown, and ensured the normal operation and output of underground equipment.
Smart Images
Figure CN222228522U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to drainage and gas production equipment for coal-bed methane wells, in particular to a rod pump drainage and gas production device for flushing coal powder in coal-bed methane wells. Background Art
[0002] During the drainage and gas production process of coalbed methane, coal powder inevitably enters the wellbore along with gas and water, often causing blockage of underground drainage equipment and drainage channels, affecting the normal production of coalbed methane wells.
[0003] In order to prevent the underground drainage equipment and drainage channels of coalbed methane wells from being blocked by coal powder, the liquid inlet of the sucker rod pump (plunger pump or screw pump) is installed under the coal seam, and water is regularly added from the oil casing annulus (gas production channel) to flush the coal powder. The water injection displacement does not exceed the displacement of the drainage equipment to prevent the well fluid from entering the production layer. In this water injection and coal powder flushing process, the water injection channel occupies the drainage channel and does not produce gas during the water injection period, and the timing of water injection is also difficult to grasp.
[0004] In the existing drainage and gas production equipment and technology, when the underground drainage and production equipment and the drainage and production channels are blocked by coal powder during the drainage and production process, if the pipe string is not raised to wash the well, it will be difficult to establish circulation, and the well fluid will enter the production layer, pollute the reservoir, and reduce production.
[0005] When underground production equipment or production channels become blocked, it is usually necessary to remove the production pipe string and production equipment, and then lower the pipe string to fish out the coal powder, or lower the flushing pipe string to perform negative pressure flushing of the coal powder, which is costly and requires a long downtime.
[0006] Therefore, when draining coalbed methane to produce gas, the existing water-adding flushing method is used to prevent underground drainage equipment and drainage channels from being blocked by coal powder. No gas is produced during water-adding flushing, and the timing of water-adding flushing is difficult to grasp. It is difficult to establish circulation when the pipe string is not moved to unblock or remove the blockage. Utility Model Content
[0007] The utility model aims to design a rod pump drainage gas production device for flushing coal powder in coalbed methane wells, which can realize gas production while flushing the well and can unblock and remove blockage without moving the pipe column.
[0008] The purpose of the utility model is achieved as follows: it includes an oil pipe, a sucker rod, and a sucker rod pump. The sucker rod pump is a plunger pump or a screw pump. The stator part of the sucker rod pump is connected to the lower part of the oil pipe, and the mover part of the sucker rod pump is connected to the lower part of the sucker rod. It also includes an outer oil pipe and a check valve. The check valve is connected to the lower part of the outer oil pipe. The outer oil pipe and the check valve are first lowered into the well, and the oil pipe and the stator part of the sucker rod pump are then lowered into the outer oil pipe. The sucker rod pump is located above the check valve, and the sucker rod is then lowered into the oil pipe.
[0009] The beneficial effects of the utility model are as follows: the annular space between the outer oil pipes and the oil pipes can be used as a gas production channel, the annular space between the outer oil pipes and the casing can be used as a water-mixed well-washing channel, the well-washing fluid is mixed with the production layer fluid and then washed and discharged through the one-way valve carrying the deposited coal powder, the gas is separated and discharged to the ground through the gas production channel, the coal powder liquid is pressurized by the sucker rod pump and discharged to the ground through the oil pipe, thereby achieving the purpose of preventing the underground extraction equipment and extraction channels from being blocked by coal powder by mixing water to wash the well without stopping production. If the sucker rod pump is blocked, the well-washing fluid is pumped into the annular space between the outer oil pipes and the oil pipes, and the one-way valve can build up high pressure to wash the sucker rod pump and the oil pipe, achieving the purpose of unblocking and unblocking the pipe string without pressing. When inspecting the pump, the annular space between the outer oil pipes and the oil pipes is filled with clean water, and the one-way valve is closed under the pressure of the liquid column, which can prevent blowouts and prevent the well fluid from entering the production layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural diagram of the utility model. DETAILED DESCRIPTION
[0011] Combine the following Figure 1 The embodiments of the present utility model are described.
[0012] Depend on Figure 1 It can be seen that the embodiment of the utility model includes an oil pipe 2, a sucker rod 3, and a sucker rod pump 4. The sucker rod pump 4 is a plunger pump or a screw pump. The stator part of the sucker rod pump 4 is connected to the lower part of the oil pipe 2, and the movable part of the sucker rod pump 4 is connected to the lower part of the sucker rod 3. It also includes an outer oil pipe 1 and a check valve 5. The check valve 5 is connected to the lower part of the outer oil pipe 1. The outer oil pipe 1 and the check valve 5 are first lowered into the well, and the oil pipe 2 and the stator part of the sucker rod pump 4 are then lowered into the outer oil pipe 1. The sucker rod pump 4 is located above the check valve 5, and the sucker rod 3 is then lowered into the oil pipe 2.
[0013] The check valve 5 is located below the production layer, or a tail pipe is connected below the check valve 5, a liquid inlet is provided at the bottom of the tail pipe, and the liquid inlet at the bottom of the tail pipe is located below the production layer.
[0014] When water is added to the annular space between the outer oil pipe 1 and the casing to wash the well, the water displacement is smaller than the displacement of the drainage equipment, so that the production layer fluid can maintain its original flow state and enter the wellbore, and the well fluid does not enter the production layer.
[0015] In order to reduce the influence of gas on the sucker rod pump 4, an air anchor may be connected under the sucker rod pump 4, and the gas separated by the air anchor is discharged to the ground from the annular space between the oil pipe 2 and the outer oil pipe 1.
Claims
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), wherein the sucker rod pump (4) is characterized in that: The invention also includes an outer oil pipe (1) and a check valve (5). The check valve (5) is connected to the lower part of the outer oil pipe (1). 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 part 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).