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Coal bed gas exploitation apparatus and exploitation method

A technology for coalbed methane and coalbed methane wells, which is applied in the fields of mining fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as sucker rod sticking, and achieve the effects of reducing mining costs and improving mining efficiency

Active Publication Date: 2016-05-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the sucker rod is stuck due to the precipitation of a large number of solid particles in the prior art, the embodiment of the present invention provides a coalbed methane mining device and mining method

Method used

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  • Coal bed gas exploitation apparatus and exploitation method

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Effect test

Embodiment 1

[0048] like figure 1 As shown, the embodiment of the present invention provides a coal seam 5 gas extraction device, and the coal seam 5 gas extraction device includes: a casing 20 connected below the wellhead 4 of a coal seam 5 gas well, an oil pipe 12, a screw pump, valves 18, Tail pipe 19, bell mouth 8, tubing anchor 22, driving head 2, hollow sucker rod 13, tubing gate 11, check valve 15, upper baffle plate 14 with mesh;

[0049] The casing 20 is arranged outside the tubing 12, the upper end of the tubing 12 is connected to the wellhead 4, the tubing 12, the screw pump, the valve 18, the liner 19 and the The bell mouth 8 is connected sequentially from top to bottom, the outer wall of the upper end of the oil pipe 12 is provided with an air outlet, the oil pipe anchor 22 is arranged between the tail pipe 19 and the casing 20, and the driving head 2 It is arranged above the wellhead 4, and the driving head 2 communicates with the upper end of the oil pipe 12, and the sucker...

Embodiment 2

[0056] like figure 1 As shown, the embodiment of the present invention provides a coal seam 5 gas extraction device, and the coal seam 5 gas extraction device includes: a casing 20 connected below the wellhead 4 of a coal seam 5 gas well, an oil pipe 12, a screw pump, valves 18, Tail pipe 19, bell mouth 8, tubing anchor 22, driving head 2, hollow sucker rod 13, tubing gate 11, check valve 15, upper baffle plate 14 with mesh;

[0057] The casing 20 is arranged outside the tubing 12, the upper end of the tubing 12 is connected to the wellhead 4, the tubing 12, the screw pump, the valve 18, the liner 19 and the The bell mouth 8 is connected sequentially from top to bottom, the outer wall of the upper end of the oil pipe 12 is provided with an air outlet, the oil pipe anchor 22 is arranged between the tail pipe 19 and the casing 20, and the driving head 2 It is arranged above the wellhead 4, and the driving head 2 communicates with the upper end of the oil pipe 12, and the sucker...

Embodiment 3

[0067] The invention provides a coalbed gas mining method, the mining method comprising:

[0068] Open the gas outlet and the oil pipe gate, start the motor connected to the driving head, make the driving head drive the sucker rod and the rotor of the screw pump to rotate together, and receive the gas mixture produced by the coal seam from the gas outlet;

[0069] When the liquid mixture produced by the coal seam flows out from the oil pipeline gate, close the oil pipeline gate;

[0070] Continue to make the driving head drive the sucker rod to rotate together with the rotor of the screw pump, so that the liquid mixture produced in the coal seam flows out from the upper end of the sucker rod.

[0071] When working, the coal seam will produce a gas mixture and a liquid mixture, the gas mixture, and the coal bed gas will rise along the inner wall of the casing to the gas outlet and be discharged. Generally, the gas outlet will be connected with other equipment to collect and uti...

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Abstract

The invention discloses a coal bed gas exploitation apparatus and an exploitation method. The coal bed gas exploitation apparatus comprises a casing pipe connected under a well mouth of a coal bed gas well, an oil pipe, a screw pump, a valve, a tail pipe a bell mouth, an oil pipe anchor, a driving head, a hollow oil pumping rod, an oil pipe gate, a check valve and an upper baffle pate with mesh holes. The exploitation method comprises steps of opening an air outlet hole and the oil pipe gate, starting a motor connected with the driving head, closing the oil pipe gate when liquid mixture produced by a coal bed flows out of the oil pipe gate, and continuously driving the driving head to drive an oil pumping rod to rotate with a rotor of the screw pump to enable the liquid mixture produced by the coal bed to flow out of the upper end of the oil pumping rod. The liquid mixture produced by the coal bed and solid particles in annular space can be discharged out of liquid inlet holes; the liquid mixture flowing to the upper part of the check valve can be restricted by the check valve and can be prevented from flowing back to the screw pump to jam the oil pumping rod, so exploitation work can be smoothly and quickly conducted; and exploitation efficiency can be improved and exploitation cost can be reduced.

Description

technical field [0001] The invention relates to the field of coal bed gas mining, in particular to a coal bed gas mining device and a mining method. Background technique [0002] Coal bed methane is a kind of methane gas that is mainly in the state of adsorption, generated and stored in coal seams and their surrounding rocks. It is mainly composed of more than 95% methane, and the other 5% is generally carbon dioxide or nitrogen. It is a high-quality energy and chemical industry. raw material. The effective use of coalbed methane produced in the process of coal mining can improve my country's energy structure to a certain extent, increase clean gas energy, and make up for the lack of geographical distribution and supply of conventional natural gas in my country. [0003] In the prior art, the mining of coalbed methane generally involves installing casing and tubing in the well, connecting a suction pump at the bottom of the tubing, lowering the sucker rod from the ground th...

Claims

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Application Information

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IPC IPC(8): E21B43/00
Inventor 金国辉杨建雨陈杰王青川窦武姚伟徐婷婷王琪樊彬何军
Owner PETROCHINA CO LTD