可控冲击波解堵增透技术在延川南煤层气田中的应用

doi:10.13809/j.cnki.cn32-1825/te.2020.04.013

摘要/Abstract

摘要：

为解决延川南区块煤层气井煤粉堵塞、产气量低等问题,开展了可控冲击波解堵增透技术的应用试验。选取4口典型井,进行了施工过程中的地质和工程参数分析,及实施前后产气量、产水量的对比分析。结果表明,可控冲击波解堵增透技术应用于煤层气井中可以提高液体流动性,促进气体解吸扩散,并且可以解堵煤储层。可控冲击波解堵增透技术的选井标准是煤层破裂压力较低、压裂改造效果好、含有夹矸、煤层含气性好和地层压力系数相对较高等。该技术具有造缝与解堵作用,可提高地层液体流动性,清除地层污染,在延川南煤层气井近井地带解堵、提升产量方面也有较好的实施效果和应用前景,并且有望成为低产、低效井的一项新型增产技术。

关键词: 可控冲击波, 延川南区块, 煤层气, 解堵增透技术

Abstract:

In order to solve the problems such as coal blockage and low gas production of coalbed methane wells in the Southern Yanchuan block, an application test of controlled shock wave plugging removal and permeability improvement technology is carried out. Therefore, four typical wells are selected to analyze the geological and engineering parameters in the construction process, as well as comparative analysis of the gas and water production before and after the implementation. The results show that the application of controllable shock wave plugging removal and permeability improvement technology in coalbed methane wells can improve liquid fluidity, promote gas desorption and diffusion, and remove plugging in coal reservoirs. The well selection criteria of this technology are low coalbed fracture pressure, good fracturing effect, including dirt band, high gas-bearing capacity of coalbed, relatively high formation pressure coefficient, etc. This technology has the effect of creating fractures and removing plugs, which can improve the fluidity of formation fluids and remove formation pollution. It has a good implementation effect and application prospect in the near-well zone of south Yanchuan coalbed methane wells to plugging removal and increase gas production, and is expected to be a new stimulation technology for low yield and efficiency wells.

Key words: controllable shock wave, South Yanchuan block, CBM（coalbed methane）, plugging removal and permeability improvement technology

中图分类号:

TE37

王喆. 可控冲击波解堵增透技术在延川南煤层气田中的应用[J]. 油气藏评价与开发, 2020, 10(4): 87-92.

WANG Zhe. Application of controllable shock wave plugging removal and permeability improvement technology in CBM gas field of Southern Yanchuan[J]. Reservoir Evaluation and Development, 2020, 10(4): 87-92.

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实施井号	煤层埋深/m	煤层厚度/m	产气量/（m³·d^-1）	产水/（m³·d^-1）	流压/MPa	套压/MPa	实施前状态类型
Y1	1 431.6~1 436.1	4.6	410	0.09	0.50	0.16	低产气、低产水
Y2	1 196.7~1 202.8	4.3	624~374	0	0.30	0.30	低产气、不产水
Y3	1 449.0~1 453.7	3.6	0	0	0.10	0.10	不产气、不产水
Y4	1 005.3~1 011.8	6.1	430	1.10	0.18	0.18	低产气、产水

实施井编号	总砂量/ m³	总液量/ m³	破裂压力/ MPa	煤体结构	矿化度/（mg·L^-1）	夹矸层数/ 层	夹矸厚度/ m	含气性/ （m³·t^-1）	压力系数/ 〔MPa·（100 m）^-1〕
Y1	50.1	781	30.6	原生-碎裂煤	18 244	3	0.39	12.5	0.773
Y2	51.2	1 021	39.0	原生-碎裂煤	27 758	3	0.50	12.7	0.768
Y3	59.1	811	53.8	碎粒-糜棱煤	23 198	0	0	10.6	0.604
Y4	40.0	617	25.0	原生-碎裂煤	3 688	2	0.33	12.0	0.443