摘要
大庆油田致密储层分布面积大,具有低渗透率、低丰度和低产量等特点,针对传统水力压裂工艺技术对于致密储层的开发存在措施效果不理想和返排不彻底的问题,开展液态二氧化碳和滑溜水交替段塞缝网压裂技术研究。利用二氧化碳在不同温度和压力下的相态特性,根据主体河道砂体内用液强度与裂缝改造阶段关系图版,采用缝网压裂工艺控制方法设计液态二氧化碳的规模及泵注比例,优化压裂施工设计,并通过现场试验验证了改造技术的可行性。应用结果表明,液态二氧化碳在近井地带可形成更为复杂的缝网体系,交替段塞可使液态二氧化碳充分进入微缝中,达到增能增效和快速返排的目的。该研究成果取得单井初期日增油6.81t的措施效果,为提高致密储层的动用程度提供了有效的技术支撑。
Tight reservoirs in Daqing Oilfield have a large distribution area with the characteristics of low permeability,low abundance and low production.In order to solve the problems such as unsatisfactory effect of measures and incomplete flowback for the development of tight reservoirs by traditional hydraulic fracturing technology,the research on fracture network fracturing technology of alternating slugs with liquid carbon dioxide and slick water was conducted.Through using the phase characteristics of carbon dioxide under different temperatures and pressures and according to the relationship chart between the strength of the liquid used in the main-channel sand body and the fracture stimulation stage,the scale of liquid carbon dioxide and pumping ratio were designed by the network fracturing process control method;and the fracturing operation was optimized;and the feasibility of the stimulation technology was also verified through field experiments.The application results showed that liquid carbon dioxide could form a more complex fracture network system in the area near the wellbore,and the alternating slugs could fully make the liquid carbon dioxide enter into the micro-fractures,so as to achieve the purpose of energy enhancement,efficiency improvement and rapid flowback.The research results have achieved the effect of the daily oil increase of 6.81 t in the initial stage in the single well,which provides an effective technical support for improving the production degree in tight reservoirs.
作者
武绍杰
Wu Shaojie(Downhole Service Company of Daqing Oilfield Limited Company)
出处
《采油工程》
2022年第2期12-18,89,共8页
Oil Production Engineering
关键词
低渗透
致密储层
液态二氧化碳
优化设计
增能增效
low permeability
tight reservoir
liquid carbon dioxide
optimal design
energy enhancement and efficiency improvement
作者简介
武绍杰,1987年生,男,工程师,现主要从事开发压裂区块方案优化及工艺技术研究工作。邮箱:zy02_wushj@petrochina.com.cn。
