中国低渗致密储层压驱技术发展现状及关键问题Development status and key issues of fracturing-flooding technique in low-permeability tight reservoirs in China
马莅,卢聪,郭建春,雍锐,吴建发,曾波
Ma Li,Lu Cong,Guo Jianchun,Yong Rui,Wu Jianfa,Zeng Bo
摘要(Abstract):
压驱技术是针对低渗致密油藏改造的关键手段,根据作用机理可分为正向压驱与反向压驱。为明确压驱工艺首要解决的工程技术难题,开展中国低渗致密储层压驱技术发展现状及关键问题研究。系统阐述了压驱技术背景,正向压驱主要针对注采井间能建立有效驱替的低渗储层油藏,反向压驱工艺针对物性更差的致密油藏,二者工艺共同助力中国低渗致密油藏经济高效开发;梳理了压驱技术的4个阶段发展历程:基质渗吸-油水置换采油阶段、裂缝-基质动态渗吸采油阶段、缝网压裂-蓄能增渗采油阶段、压裂驱油-闷井渗吸采油阶段;从工程参数、工艺特征等角度揭示了压驱工艺的3大物理过程:压驱注入、闷井渗吸、协同注采。最终从低渗致密油藏压驱现场问题出发,总结了“压驱排量及注水总量”“闷井必要性及时间”“生产制度及补能时机”等压驱工程问题,抽提出压驱过程中面临的“微裂缝破裂及延伸机制”“物化作用闷井渗吸机理”“油水多场耦合流动机制”等科学问题。研究成果可以为压驱基础理论研究及现场应用提供指导。
Fracturing-flooding technique is a key method for stimulation of low-permeability tight reservoirs, which can be divided into forward fracturing flooding and reverse fracturing flooding based on its mechanism. In order to clarify the primary engineering and technical challenges to be solved in fracturing-flooding process, research on the current development status and key issues of fracturing-flooding technique in China's low-permeability tight reservoirs is carried out, systematically describing the background of fracturing-flooding technique. Forward fracturingflooding mainly aims at low-permeability reservoirs with effective displacement between injector and producer, while reverse fracturing-flooding aims at tight reservoirs with poorer physical properties. The 2 techniques contribute to the economic and efficient development of low-permeability tight reservoirs in China. Development history of fracturing-flooding technique in 4 stages is summarized, including matrix imbibition-oil-water displacement production stage, fracture-matrix dynamic imbibition production stage, fracture network fracturing-energy storage and permeability increasing production stage and fracturing flooding-soaking imbibition production stage. From perspectives of engineering parameters and technical characteristics, 3 major physical processes of fracturing-flooding technology are revealed, including fracturing flooding injection, soaking imbibition and collaborative injection and production. Finally, based on field challenges of fracturing-flooding in low-permeability tight reservoirs, engineering problems of fracturing-flooding such as “displacement rate and water injection volume”, “soaking necessity and time”, “production system and energy replenishment timing” are summarized, and scientific problems such as “mechanisms of micro-fracture initiation and extension”, “physicochemical soaking imbibition mechanism” and “oil-water multi-fields coupling flow mechanism” are extracted. The research provides guidance for the fundamental theoretical study and field application of fracturing-flooding.
关键词(KeyWords):
低渗致密储层;压驱工艺;压驱注入;闷井渗吸;协同注采
low-permeability tight reservoir;fracturing-flooding technique;fracture-flooding injection;soaking imbibition;collaborative injection and production
基金项目(Foundation): 国家自然科学基金项目“深层页岩压裂人工干预转向多裂缝动态扩展机制”(52374044);; 四川省科技计划项目“页岩气暂堵转向压裂颗粒运动机理与裂缝扩展机制”(2023JDRC0008)
作者(Author):
马莅,卢聪,郭建春,雍锐,吴建发,曾波
Ma Li,Lu Cong,Guo Jianchun,Yong Rui,Wu Jianfa,Zeng Bo
DOI: 10.19597/J.ISSN.1000-3754.202502011
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- 低渗致密储层
- 压驱工艺
- 压驱注入
- 闷井渗吸
- 协同注采
low-permeability tight reservoir - fracturing-flooding technique
- fracture-flooding injection
- soaking imbibition
- collaborative injection and production