煤层气井堵塞型递减原因分析及治理——以延川南煤层气田为例

doi:10.13809/j.cnki.cn32-1825/te.2022.04.010

Abstract

Abstract:

In the production process, part of the wells in southern Yanchuan CBM Field has the plugging characteristics of abnormal and rapid decline of gas production and liquid production. In order to analyze the causes of blockage, based on the changes of the production dynamic information of the liquid recovery, water quality and pump check of wells, the main cause of plugging is clarified, including scaling and pulverized coal. On the basis of analyzing the formation mechanism of scaling and pulverized coal blockage, the targeted prevention and treatment measures are carried out. For the scaling plugging wells, form a treatment measure combining the normal prevention by adding scale inhibitor and the plugging removal by multi-stage pulse shock wave. 16 wells implemented by multi-stage pulse shock wave have got a good production increase with an average production increase of 30.11×10⁴m³ per well. For the pulverized coal plugging wells, coal-carrying process by self-circulation and hollow rod well washing, and nitrogen foam well-unblocking treatment measures are formed. Well washing for carrying pulverized coal effectively alleviate the pump check caused by pulverized coal blocking pump, the gas well repair free period extended by 60 %. Four wells applied the nitrogen foam for unblocking achieve significant production increase, with an average daily production increase of 1.25×10⁴m³ per well. The results provide references for the cause analysis and treatment of blocked CBM wells.

Key words: deep coal seam, pulverized coal, scale formation, plugging, plug removal

CLC Number:

TE37

Xiao LIU,Bin CUI,Zhan WU. Cause analysis and treatment of coal-bed gas well plugging decline: A case study of southern Yanchuan CBM Field[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(4): 626-632.

Figures/Tables 10

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元素组分	质量分数（%）
Ca	76.393
Fe	17.164
Mg	0.332
Al	0.124
Si	0.342
P	0.008
S	2.344
Na	0.417
Mn	0.412
Cu	0.300
Zn	0.008
Sr	1.365
Ba	0.305

Cause analysis and treatment of coal-bed gas well plugging decline: A case study of southern Yanchuan CBM Field

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