摘要
超临界CO_(2)(SC-CO_(2))压裂技术是一种极具潜力的新兴非常规油气储层增产技术,该技术不仅可有效避免传统水力压裂引发的地层损害、环境污染、水资源浪费等问题,还具有起裂压力低、成缝复杂等优势。SC-CO_(2)压裂实验是在室内开展SC-CO_(2)压裂工艺研究、压裂增产机理认识和总结的重要技术手段。综述SC-CO_(2)压裂实验研究进展,以指导SC-CO_(2)压裂技术的发展。首先,介绍室内SC-CO_(2)压裂实验系统的组成及功能,针对实验装置存在的不足提出建议。然后,归纳分析SC-CO_(2)压裂实验研究成果,认为SC-CO_(2)渗透性强,因此相较于水力压裂其起裂压力低,同时SC-CO_(2)能够沟通岩石内部的微裂缝和微孔隙,促进复杂裂缝网络的形成。最后,总结各项实验研究所得的裂缝内SC-CO_(2)携支撑剂运移规律。研究表明,SC-CO_(2)携支撑剂的运移规律与水基压裂液相似,但运移效果稍差之。目前,需加强SC-CO_(2)携支撑剂运移室内实验研究,以进一步优化SC-CO_(2)压裂的工艺参数。
Supercritical CO_(2)(SC-CO_(2))fracturing technology represents a highly promising emerging technique for enhancing production in unconventional oil and gas reservoirs.This technology not only effectively avoids issues such as formation damage,environmental pollution,and water resource depletion caused by traditional hydraulic fracturing but also offers advantages such as lower initiation pressure and complexity in fracture propagation.SC-CO_(2) fraturing experiment in an important technical means for conducting research on SC-CO_(2) fraturing technology,understanding and sumarizing the mechanism production increase.Therefore,this review discusses advancements in SC-CO_(2) fracturing experiments aimed at guiding the development of SC-CO_(2) fracturing technology.Firstly,the composition and functionalities of the laboratory-scale SC-CO_(2) fracturing experimental system are introduced,along with suggestions for addressing existing shortcomings in the experimental setup.Secondly,an analysis of research findings from SC-CO_(2) fracturing experiments is presented.It is observed that SC-CO_(2) exhibits lower initiation pressure compared to hydraulic fracturing due to its enhanced permeability.Additionally,SC-CO_(2) has the capability to interact with the internal microcracks and micropores of rocks,promoting the formation of complex fracture networks.Lastly,insights gained from experimental studies on the transport of SC-CO_(2) with proppants within fractures are summarized.The result indicates that the transport behavior of SC-CO_(2) with proppants is similar to that of water-based fracturing fluids,albeit less effective.At present,it is necessary to strengthen laboratory experimental studies on the transport of SC-CO_(2) with proppants to further optimize process parameters for SC-CO_(2) fracturing.
作者
蔡灿
周圣文
陈浩
赵玉龙
张烈辉
CAI Can;ZHOU Shengwen;CHEN Hao;ZHAO Yulong;ZHANG Liehui(Laboratory of High-Pressure Jet Theory and Application Technology,School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)
出处
《重庆科技大学学报（自然科学版）》
CAS
2024年第4期11-19,共9页
Journal of Chongqing University of Science and Technology(Natural Sciences Edition)
基金
国家自然科学基金重点项目“海相页岩水平井超临界二氧化碳压裂机理与一体化模拟研究”(52234003)
国家自然科学基金青年基金项目“超临界CO 2循环喷射压裂作用下干热岩储层缝网形成与增渗机理研究”(52004236)
国家自然科学基金优秀青年科学基金项目“页岩气多尺度非线性渗流力学”(52222402)
地球深部钻探与深地资源开发国际联合研究中心项目“超声-自振射流流场特性及强化除垢机理”(DEDRD-2023-06)。
