方法理论

延川南煤层气田低效井原因分析与措施优选

  • 李鑫 ,
  • 肖翠 ,
  • 陈贞龙 ,
  • 金晓波
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  • 中国石化华东油气分公司勘探开发研究院, 江苏 南京 210019
李鑫(1984—),男,硕士,工程师,主要从事煤层气勘探开发工作。通讯地址:江苏省南京市建邺区江东中路375号金融城9号楼,邮政编码:210019。E-mail:282945654@qq.com

收稿日期: 2020-02-25

  网络出版日期: 2020-08-07

基金资助

中国石化科技部项目“延川南深层煤层气稳产技术研究”(P19019-4)

Analysis of low-efficiency wells in CBM gas field of South Yanchuan and optimization of measures

  • Xin LI ,
  • Cui XIAO ,
  • Zhenlong CHEN ,
  • Xiaobo JIN
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  • Research Institute of Exploration and Development, Sinopec East China Oil and Gas Company, Nanjing, Jiangsu 210031, China

Received date: 2020-02-25

  Online published: 2020-08-07

摘要

针对延川南深层煤层气田低产低效井占比高,低产原因复杂,难以达到预期开发效果的问题,以延川南煤层气田低产低效井为研究对象,通过开展地质工程一体化研究分析,结合煤层气开发实践经验,认为排采速度不合理导致煤储层渗流通道堵塞,储层改造不到位导致泄流面积小,低压区地层能量不足导致煤层气解吸受限这三大问题是延川南低效井低产的主要原因。针对低效原因分别开展了可控强脉冲解堵、体积压裂实现裂缝转向、氮气扰动疏通促解吸等增产措施。现场应用评价结果显示,这些措施均能实现不同程度的增产,其中体积压裂可以达到有效改善储层物性的目的,单井日增产气1 000~4 000 m 3,增产效果显著,是延川南煤层气田目前最为有效的增产措施。

本文引用格式

李鑫 , 肖翠 , 陈贞龙 , 金晓波 . 延川南煤层气田低效井原因分析与措施优选[J]. 油气藏评价与开发, 2020 , 10(4) : 32 -38 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.04.005

Abstract

The low-yield and low-efficiency wells in the deep coal seam gas field of South Yanchuan are of high proportion and the reasons for low-yield are complex, so that it is difficult to achieve the expected development effect. In order to solve these problems, taking the low-yield and low-efficiency wells in South Yanchuan CBM Gas Field as the research object, the integrated research and analysis of geological engineering have been carried out. Combined with the practical experience of CBM development, it is found that the unreasonable drainage rate leads to the blockage of coal reservoir seepage channels, the inadequate reservoir transformation results in a small discharge area, and the lack of formation energy in the low-pressure area leads to the limitation of coal bed methane desorption. These three problems are the main reasons for the production of low-efficiency wells in South Yanchuan. For the reasons of inefficiency, production stimulation measures such as controllable strong pulse deblocking, volume fracturing to achieve fracture steering, nitrogen disturbance dredging and desorption have been carried out. The results of field application evaluation show that these measures can achieve different degrees of production increase, among which volume fracturing can achieve the purpose of effectively improving the physical properties of the reservoir. The daily production of a single well is increased by 1 000~4 000 m 3. The effect of production increase is remarkable. It is the most effective means of increasing production in South Yanchuan CBM Field currently.

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