CAJ | 학술논문

裂缝性致密储层裂缝发育，易发生工作液漏失，严重损害储层。为探究不同工作液漏失损害机理，形成高效防治方法，以川西北九龙山构造须家河组、珍珠冲组裂缝性致密储层为研究对象，开展了钻井完井液储层损害实验及工作液顺序接触损害实验。结果表明：钻井完井液滤液、体系和固相对基块岩样的损害程度介于中偏强强，且逐个减弱；裂缝岩样渗透率动态损害程度为强；工作液顺序接触后损害程度加剧。分析认为，水相圈闭、固相堵塞是裂缝性致密储层工作液漏失损害储层的主要机理。不同工作液漏失引起储层损害程度叠加、损害范围扩大。根据分析结果，构建了工作液漏失损害模式，并提出相应损害防治方法。使用改性屏蔽暂堵钻井完井液提高封堵能力，改变岩石表面润湿性，可有效预防工作液漏失损害；利用工作液漏失数据，确定漏失损害带范围，可为酸化作业提供指导。
렬봉성치밀저층렬봉발육，역발생공작액루실，엄중손해저층。위탐구불동공작액루실손해궤리，형성고효방치방법，이천서북구룡산구조수가하조、진주충조렬봉성치밀저층위연구대상，개전료찬정완정액저층손해실험급공작액순서접촉손해실험。결과표명：찬정완정액려액、체계화고상대기괴암양적손해정도개우중편강강，차축개감약；렬봉암양삼투솔동태손해정도위강；공작액순서접촉후손해정도가극。분석인위，수상권폐、고상도새시렬봉성치밀저층공작액루실손해저층적주요궤리。불동공작액루실인기저층손해정도첩가、손해범위확대。근거분석결과，구건료공작액루실손해모식，병제출상응손해방치방법。사용개성병폐잠도찬정완정액제고봉도능력，개변암석표면윤습성，가유효예방공작액루실손해；이용공작액루실수거，학정루실손해대범위，가위산화작업제공지도。
Fractured tight gas reservoirs is characteristic of developed natural fractures which lead to lost circulation of working fluid and induce formation damage. In order to study the damage mechanism of working fluids indifferent operations and to find out prevention strategies,based on the Xujiahe formation and Zhenzhuchong formation in the Jiulongshan Structure in western Sichuan Basin which is a fractured tight gas reservoir,we carried out the damage evaluation experiments of drill-in fluid and the working fluids order contact. The experimental results show that the damage grades of blocks induced by the filtrate of drill-in fluid,the drill-in fluid and the drill-in fluid solids range from medium to intensely and reduce gradually;the average permeability dynamic damage grade of the fractured samples is intense;the working fluid order contact would strengthen the damage degree. The analysis of the damage mechanism of different operations shows that water phase trapping,solid plugging are the major mechanism of working fluids damage;the damage induced by different working fluid would be superimposed, and increased the damage range. Based on the results,we constructed the damage patterns of lost circulation,and suggest using the modified shielding plugging drill-in fluid to improve sealing ability and change the rock wettability can prevent the working fluid damage effectively. Identification of damage range with lost circulation data can provide guidance for acidizing.