煤层地应力及破裂压力解释技术  

INTERPRETING TECHNIQUES OF THE TERRESTRIAL STRESS AND FRACTURE PRESSURE FOR COAL BEDS

作　　者：杜国峰[1] 郭大立[1] 薛玲[1] 李斌斌[1] 贺建[1] 

机构地区：[1]西南石油大学理学院

出　　处：《大庆石油地质与开发》2014年第6期171-174,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“中阶煤储层压前决策、压裂液、压裂数值模拟和评估技术研究”(2011ZX05062-008)

摘　　要：地应力影响煤储层渗透性并控制煤储层压裂裂缝分布,破裂压力是压裂设计和分析的主要依据,然而现有地应力及破裂压力解释技术在煤层领域的应用均存在不足.针对煤层低孔、低渗特点,分析了5种常见计算地应力经典模型,认为黄氏模型经过优化后更适合计算煤层应力,并得到实例应用证明;利用矩阵求解矛盾方程组的方法,优化了破裂压力预测模型,优化模型的预测准确率较原始模型提升了25.5％.为今后煤层应力解释及破裂压力预测提供了方法和依据.Terrestrial stresses influence the permeabilities of the coal reservoirs and control the fracture distribution of the fractured reservoirs, the fracture pressure is the main evidence for the fracturing design and analysis. But it is deficient for the existing interpreting techniques of the stresses and fracture pressure in the coalbed domain. In the light of the low-porosity and low-permeability features of the coalbeds, five kinds of analyzed common classical model of the stress calculation show that Huang model is more adapted itself to the calculation after optimized and moreover is verified by the history case; with the help of the contradiction equations solved by the matrix, the predicting models of the fracture pressure are optimized, thus the accuracy of the models has been enhanced by 25. 5 % than the original. Therefore the method and evidence are provided for the interpretation of the terrestrial stress and prediction of the fracture pressure.

关 键 词：压裂气井 合理试气压差 优化模型 应力敏感 闭合应力 

分 类 号：TE122[石油与天然气工程—油气勘探]