煤矿采空区天然气井完整性风险评价及对策研究

doi:10.11885/j.issn.1674-5086.2022.11.05.01

摘要/Abstract

摘要： 鄂尔多斯盆地煤矿开采扰动和地层沉陷严重威胁着临近天然气井的井筒完整性，导致近30%开发区生产井面临着天然气井下和地面泄漏的风险，给该区域天然气和煤矿生产带来巨大的安全隐患。为了有效降低煤矿开采区天然气井安全生产风险，在井筒完整性影响因素分析的基础上，采用WBS-RBS矩阵构建井筒完整性结构单元要素与潜在风险因素耦合模型，建立井筒完整性风险评价指标体系并利用层次分析法和熵权法综合确定其组合权重系数，并基于后悔理论建立井筒完整性风险评估模型，确定煤矿开采区天然气井井筒完整性的主控因素和风险等级。以PG14井为例进行模型验证分析，并提出相应的治理对策。结果表明，基于后悔理论的井筒完整性风险评估结果与现场实践基本一致，说明该方法应用于煤矿开采区天然气井完整性风险评估领域是可行的，且能够有效提高评估结果的客观性，从而指导煤矿开采区天然气井完整性风险管理。

关键词: 煤矿开采, 井筒完整性, 风险评价, WBS-RBS矩阵, 后悔理论, 对策

Abstract: Coal mining disturbance and formation subsidence in Ordos Basin seriously threaten the wellbore integrity of adjacent natural gas wells, resulting in nearly 30% of production Wells in the development zone facing the risk of underground and surface leakage of natural gas, which brings huge security risks to the production of natural gas and coal mines in this region. In order to effectively reduce the safety production risks of natural gas wells in coal mining areas, based on the analysis of factors affecting wellbore integrity, the coupling model of structural unit elements and potential risk factors of wellbore integrity is constructed by using WBS-RBS matrix, and the index system of wellbore integrity risk evaluation is established. The combined weight coefficient is determined by analytic hierarchy process and entropy weight method. Based on the regret theory, the wellbore integrity risk assessment model is established to determine the main controlling factors and risk levels of natural gas wells in coal mining areas. The model validation analysis was carried out with Well PG14 as an example, and corresponding management countermeasures were proposed. The results show that the results of wellbore integrity risk assessment based on regret theory are basically consistent with field practice, indicating that the method is feasible in the field of natural gas well integrity risk assessment in coal mining areas, and can effectively improve the objectivity of evaluation results, so as to guide the integrity risk management of natural gas wells in coal mining areas.

Key words: coal mining, wellbore integrity, risk assessment, WBS-RBS matrix, regret theory, countermeasure

中图分类号:

TE26

郭润生, 余晓钟, 高斐. 煤矿采空区天然气井完整性风险评价及对策研究[J]. 西南石油大学学报(自然科学版), 2025, 47(3): 156-169.

GUO Runsheng, YU Xiaozhong, GAO Fei. Integrity Risk Assessment and Countermeasures for Gas-coal Cooperative Exploitation of Sulfur Gas Wells[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(3): 156-169.

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