王昱, 宋晓夏, 胡咤咤,等. 西山煤田屯兰区块煤层气低产井的增产改造措施及效果分析[J].河南理工大学学报(自然科学版), doi: 10.16186/j.cnki.1673-9787.2024030021.

WANG Y, SONG X x, HU Z z,et al. Measures and effect analysis of stimulation and rehabilitation of low-production coalbed methane wells in Tunlan Block, Xishan Coalfield [J]. Journal of Henan Polytechnic University( Natural Science), doi:10.16186/j.cnki.1673- 9787. 2024030021.

西山煤田屯兰区块煤层气低产井的增产改造措施及效果分析(网络首发)

王 昱 ¹，宋晓夏 ^1,2，胡咤咤 ³，刘彦飞 ¹，杜立强 ⁴，

祁 炜 ⁵，阎纪伟 ¹，郭 浩 ⁴，陈伟东 ¹

（1.太原理工大学 矿业工程学院，山西 太原 030024；2.煤系关键矿产资源精细勘查山西省重点实验室，山西 太原 030001；3.河南理工大学 能源 科学与工程学院，河南 焦作 454000；4.山西西山蓝焰煤层气有限责任公司，山西 太原 030200；5.中石油煤层气有限责任公司临汾分公司，山西 临汾 041000）

摘要:空西山煤田屯兰区块煤层气开发已具一定规模，但部分煤层气井产气效果未达到预期，亟待开展针对性的增产改造措施，以期提高气井产量。 目的 为了探究屯兰区块煤层气井的初次压裂改造特征与低产井的增产改造效果， 方法 以屯兰区块煤层气井的地质和工程资料为基础，气井产量为依据，102 口直井和7 口水平井为研究对象，压裂曲线类型、破裂压力特征及产能特征为切入点，分析研究区内煤层气井的初次压裂改造特征，采用生产动态分析方法探讨实施加密煤层气井井网技术对低产井的增产效果。 结果 结果表明，屯兰区块煤层气井初次压裂改造时压裂曲线类型可划分为稳定型、下降型、上升型、波动型 4 种，其中，下降型和稳定型压裂曲线更有利于煤层气抽采；研究区中波动型和上升型曲线类型占比偏高，反映了煤层破裂难度较大、非均质性较强；通过在先导试验区进行加密煤层气井井网增产改造，在直井间加密布设 7 口水平井，其附近 9 口低产直井的平均日产气量显著提高，由 150~800 m³/d 提升到 330~6 000 m³/d，验证了该技术的有效性；研究区内煤层气井产气量低的主要原因是煤储层原始渗透率低、初次压裂改造不充分，加密煤层气井井网增产改造技术是一种行之有效的低产井增产改造措施。 结论 研究结果可为本区或类似地区煤层气低产井的增产改造提供指导与借鉴。

关键词: 煤层气；屯兰区块；压裂曲线类型；产能特征；增产改造措施

中图分类号：TE377

doi: 10.16186/j.cnki.1673-9787. 2024030021

基金项目: 国家自然科学基金资助项目（42302200）；山西省科技重大专项项（20201102002-1，202101080301014-1）；山西省基础研究计划青年项目（20210302123061，20210302124109）；河南省科技攻关项目（232102320200）

收稿日期：2024-03-07

修回日期：2024-05-15

网络首发日期：2024-08-21

Measures and effect analysis of stimulation and rehabilitation of low-production coalbed methane wells in Tunlan Block, Xishan Coalfield (Online)

WANG Yu¹, SONG Xiaoxia^1,2, HU Zhazha³, LIU Yanfei¹, DU Liqiang⁴, QI Wei⁵, YAN Jiwei¹,GUO Hao⁴, CHEN Weidong¹

（1.School of Mining Engineering,Taiyuan University of Technology, Taiyuan 030024, Shanxi, China; 2.Shanxi Key Laboratory of Fine Exploration of Coalbased Critical Mineral Resources, Taiyuan 030001, Shanxi, China; 3.School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China; 4.Shanxi Xishan Lanyan coal bed Methane Co. Ltd., Taiyuan 030200, Shanxi, China; 5.Linfen Branch of Petrochina Coalbed Methane Co., Ltd., Linfen 041000, Shanxi, China)

Abstract: Coalbed methane（CBM）development in the Tunlan Block of Xishan Coalfield has reached a certain scale, but the gas production of some CBM wells has not met expectations. Therefore, there is an urgent need to carry out targeted stimulation and rehabilitation measures to increase the production of CBM wells. Objectives The objective of this study is to investigate the characteristics of primary fracturing and evaluate the effect of stimulation and rehabilitation on low-production wells in Tunlan Block. Methods Based on the geological data, engineering data and production data from 102 vertical wells and 7 horizontal wells in Tunlan Block, this study analyzes the characteristics of primary fracturing in CBM wells by considering fracturing curve types, rupture pressure, and production capacity characteristics in the study area. Additionally, a production dynamic analysis method is used to evaluate the stimulation effect of implementing dense well network on low producing CBM wells. Results The study reveals that the fracturing curves of CBM wells in Tunlan Block can be classified into four types: stable, descending, ascending and fluctuating types. Stable and descending fracturing curves are more favorable for efficient CBM extraction. The high proportion of fluctuating and ascending curves in the study area reflects the greater difficulty in fracturing the coal seam and the strong heterogeneity. By implementing a dense CBM well network in the pilot test area, seven horizontal wells were densely deployed between vertical wells, and the average daily gas production of nine nearby low-producing vertical wells was significantly increased from 150-800 m³/d to 330-6000 m³/d, demonstrating the effectiveness of the technology. Conclusions The main reasons for the low gas production of CBM wells in the study area are low original permeability of coal reservoirs and insufficient initial fracturing and rehabilitation. The technology of implementing dense CBM well network is a well-established and effective measure to increase gas production of low-production wells. This study can provide guidance and reference forthe stimulation and rehabilitation of low-production CBM wells in the study area or similar areas.

Key words：coalbed methane; Tunlan Block; fracturing curve types; production capacity characteristics; stimulation and rehabilitation measures

CLC: TE377