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Coal bed gas extraction method and system

A technology for coalbed methane and Christmas tree, which is applied in the field of coalbed methane drainage and production methods and systems, can solve the problems of poor gas regulation accuracy, difficulty in parameter regulation, and many parameters, and achieves the effects of improving gas regulation precision and improving coalbed methane production.

Active Publication Date: 2021-09-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are many parameters involved in the coalbed methane drainage system provided by related technologies, which are difficult to adjust and have poor accuracy.
Moreover, bottomhole flow pressure parameters have an important impact on coalbed methane production, and the related technologies have not fundamentally ruled out the influence of bottomhole flow pressure parameters on coalbed methane production, resulting in poor gas regulation accuracy, and thus cannot ensure efficient coalbed methane extraction

Method used

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  • Coal bed gas extraction method and system
  • Coal bed gas extraction method and system
  • Coal bed gas extraction method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] This embodiment provides a coalbed methane drainage system, which includes: a control box 1, a tubular pump oil pipe string 2, a downhole pressure gauge 3, a wellhead Christmas tree 4, a gas production pipeline 5, a water production pipeline 6, a A flow meter 7, a check valve 8, a second flow meter 9, a pumping unit, and terminal equipment. Among them, the tubing pump tubing string 2 includes: a screw plug 201 (D89mm×0.10m), a tubing nipple 202 (D73mm×1.50m), a stainless steel screen 203 (D89mm×2.03 m, sieve hole is 80 mesh), tailpipe 204 (D73mm×9.81m), tube pump 205 (D44mm×4.83m), support cylinder 206 (length 1.25m), 93 connected flat oil pipes 207 (D73mm× 909.27m), double male nipple (D73mm×0.15m), tubing hanger (0.13m in length), oil filling distance (0.3m in length). The downhole pressure gauge 3 is arranged on the outer wall of the reduced-diameter section 2062 of the supporting cylinder 206, and is electrically connected to the control box 1 through a cable. The ...

Embodiment 2

[0139] This embodiment provides a coalbed methane extraction method, which is applied to the coalbed methane extraction device provided in Embodiment 1. This method is applied to the coalbed methane well Q18-29 in the southern Qinshui Basin. The depth of the coal seam section is 904.3-910.3m, the inner diameter of the production casing M is 139.7mm, the depth of the completion well is 1028m, and the depth of the artificial well bottom is 936m. The method specifically includes:

[0140] Step 201, open the first system valve, the second system valve on the wellhead Christmas tree 4, and the check valve 8 on the gas production pipeline 5, so that the wellhead Christmas tree 4, the gas production pipeline 5, and the water production pipeline 6 are connected, Control the pumping unit to start pumping at a speed of 1 time / min through the control box 1.

[0141] Step 202, the terminal equipment receives the downhole flow pressure signal sent by the downhole pressure gauge 3 collecte...

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Abstract

The invention discloses a coal bed gas extraction method and system, belonging to the field of coal bed gas mining. The coalbed methane drainage method includes: controlling the conduction of the wellhead Christmas tree, the gas production pipeline, and the water production pipeline, and controlling the pumping unit to start pumping through the control box; According to the bottomhole flow pressure signal and the preset flow pressure variable, the pumping unit is controlled to adjust the stroke times through the control box; the CBM flow signal of the first flow meter is collected at preset intervals; according to the bottomhole flow pressure signal, the CBM flow rate Signal to determine the gas production factor; according to the gas production factor, current coalbed methane production, and planned coalbed methane production, determine the simulated drainage pressure drop; according to the simulated drainage pressure drop, control the pumping unit to adjust the pumping times through the control box. The method fully considers the influence of the bottom hole flowing pressure on the production of coalbed methane, improves the precision of gas regulation, and can ensure the production of coalbed methane.

Description

technical field [0001] The invention relates to the field of coalbed methane mining, in particular to a coalbed methane drainage method and system. Background technique [0002] Coalbed methane refers to: most of the hydrocarbon gas is adsorbed on the surface of coal matrix particles, and a small part is free in coal pores or dissolved in coal seam water, which belongs to unconventional natural gas. The coalbed methane drainage process is as follows: the formation pressure is reduced to the critical desorption pressure of coalbed methane by drainage and depressurization, and the coalbed methane adsorbed on the surface of coal matrix particles starts to desorb, and then continues to drain and depressurize, so that the coalbed methane can be released from the coalbed. produced in gas wells. In the process of coalbed methane drainage, continuous and smooth drainage and pressure reduction can stabilize the dynamic liquid level of coalbed methane wells, protect coal reservoirs, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/12
CPCE21B43/006E21B43/121
Inventor 李梦溪胡秋嘉樊彬刘忠何军张金笑冯树仁晁巍巍乔茂坡毛崇昊白宇杉刘昌平李玲玉贾慧敏
Owner PETROCHINA CO LTD
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