摘要
中国深层煤岩气储层改造中仍面临着淡水消耗量大、复杂缝网难以形成、储层伤害大等难题,而CO_(2)压裂技术为解决这些难题提供了新思路。为了提高CO_(2)压裂技术在煤岩气储层改造中的适用性,开展了煤岩气藏CO_(2)压裂作用机理研究,开发了CO_(2)压裂参数优化设计软件,改善了CO_(2)泡沫压裂液体系,并结合施工案例分析了CO_(2)压裂技术应用效果。理论研究和现场试验结果表明,研发的CO_(2)压裂优化设计软件计算效率提高50%;开发的CO_(2)泡沫压裂液体系泡沫半衰期达194 min,泡沫质量超75%,具有良好的耐温耐剪切性能和携砂性能;CO_(2)压裂作业后煤岩气储层形成了复杂缝网,导流能力优于常规水力压裂;CO_(2)前置压裂井平均试气产量比常规水力压裂井增产约15%;CO_(2)泡沫压裂井增产约18%,平均每口井节水50%以上。CO_(2)压裂技术实现了造复杂缝、增产、节水、减排的目的,在煤岩气绿色高效开发中具有广阔的应用前景。
The stimulation f deep coal-rock gas reservoirs in China still faces challenges such as high freshwater consumption,difficulty in forming complex fracture networks and significant reservoir damage.CO_(2)fracturing technology offers a new approach to solving these problems.In order to improve the applicability of CO_(2)fracturing technology in the stimulation of coal-rock gas reservoirs,research was conducted on the mechanism of CO_(2)fracturing in coal-rock gas reservoirs,the optimization design software of CO_(2)fracturing parameters was developed,the CO_(2)foam fracturing fluid system was improved,and the application effect of CO_(2)fracturing technology in combination with operation cases was analyzed.Theoretical research and field application have shown that the developed CO_(2)fracturing optimization design software has increased the calculation efficiency by 50%.The developed CO_(2)foam fracturing fluid system has a foam half-life of 194 min and foam quality of over 75%,which has good temperature resistance,shear resistance and proppant carrying capacity.After CO_(2)fracturing operation,a complex fracture network is formed in the coal-rock gas reservoir with better flow capacity than conventional hydraulic fracturing.Meanwhile,the average gas production of CO_(2)pre-fracturing wells is about 15%higher than that of conventional hydraulic fracturing wells,While CO_(2)foam fracturing wells increase production by about 18%and save water by more than 50%on average for each well,thus achieving the purpose of creating complex fractures,increasing production,saving water and reducing emissions.In conclusion,CO_(2)fracturing technology has broad application prospects in the environmentally friendly and efficient development of coal-rock gas reservoirs.
作者
孙虎
陆灯云
李泽锋
刘国良
张宏忠
兰建平
司晓冬
叶赛
SUN Hu;LU Dengyun;LI Zefeng;LIU Guoliang;ZHANG Hongzhong;LAN Jianping;SI Xiaodong;YE Sai(CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Sichuan 610041,China;National Engineering Laboratory for Low-permeability Oil&Gasfield Exploration and Development,Xi′an,Shaanxi 710018,China;Changqing Downhole Technology Operating Company,Chuanqing Drilling Engineering Co.,Ltd.,Xi′an 710021,Shaanxi)
出处
《钻采工艺》
北大核心
2025年第3期139-146,共8页
Drilling & Production Technology
基金
中国石油集团公司攻关性应用性专项“非常规储层体积压裂共性技术研究”(编号:2023ZZ28YJ01)。
关键词
煤岩气
CO_(2)压裂
复杂缝网
增产
节约水资源
coal-rock gas
CO_(2)fracturing
complex fracture network
increase production
save water
