摘要
承压堵漏作为低承压地层漏失防治的常用技术,理论体系和堵漏材料取得长足进步的同时,重要的施工参数却未获得足够的关注。为此,根据井下地应力环境,优选了高强度的堵漏材料,确立了不同施工参数和随钻堵漏的承压堵漏实验方案,使用自研的大型真三轴承压堵漏实验设备,在致密砂岩试样(尺寸为300 mm×297 mm×297 mm)上产生诱导裂缝,观测了裂缝扩展规律,基于诱导裂缝开展了承压堵漏实验。研究表明:针对承压能力弱的地层,施工参数会导致井内压力变化,从而影响封堵效果;反复在同一地层开展堵漏作业会造成裂缝扩展,导致封堵效果降低;堵漏浆进入裂缝的先后顺序以及封堵层的结构均与裂缝的几何参数密切相关。本文取得的规律性认识可为承压堵漏方案制定提供参考。
As a common technology for the prevention and control of lost circulation in low pressure bearing formations,the theoretical system and plugging materials have made great progress,but the important construction parameters have not been paid enough attention.Therefore,according to the underground in-situ stress environment,this paper selects high-strength plugging materials,and establishes the pressure plugging experimental scheme with different construction parameters and plugging materials while drilling.The self-developed large-scale true triaxial pressure plugging experimental equipment is used to conduct the test on the dense sandstone sample(size:300 mm×297 mm×297 mm),and the hydraulic-fracture propagation law was observed.Based on the hydraulic-fracture,the pressure plugging experiment was carried out.According to the experimental results,for the formation with weak bearing capacity,the construction parameters will cause the pressure change in the well,thus affecting the plugging effect;repeated plugging operations in the same formation will cause fracture expansion and reduce the plugging effect;the sequence of plugging slurry entering the fracture and the structure of the plugging layer are closely related to the geometric parameters of the fracture.The regular knowledge obtained in this paper can provide some reference for the formulation of pressure plugging scheme.
作者
邱小江
张洪亮
魏艺萌
吴坷
刘成
杨芯惠
于慧超
QIU Xiaojiang;ZHANG Hongliang;WEI Yimeng;WU Ke;LIU Cheng;YANG Xinhui;YU Huichao(Development Division,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610066;China University of Petroleum,Beijing 100100;No.9 Oil Production Plant of Daqing Oilfield Co Ltd,Daqing,Heilongjiang 163853;Exploration Division,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041;No.3 Drilling Company of CNPC Bohai Drilling Company,Tianjin 300280)
出处
《钻井液与完井液》
CAS
北大核心
2023年第1期54-59,共6页
Drilling Fluid & Completion Fluid
基金
国家自然科学基金“超深碳酸盐岩断裂体储层酸压裂缝与天然裂缝—溶洞相互作用机理”(52074311)
中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项“鄂尔多斯盆地致密油-页岩油富集、高效开发理论与关键技术研究”(ZLZX2020-02)。
关键词
真三轴承压堵漏
施工参数
诱导裂缝
承压能力
True triaxial pressure bearing plugging
Construction parameters
Induced fracture
Pressure bearing capacity
