摘要
针对碳酸盐岩地层钻井作业时的钻井液漏失问题,基于双重介质理论,建立了适用于裂缝—孔隙性地层的二维钻井液漏失模型。基于该模型,分析了裂缝开度、裂缝法向刚度、基质孔隙度和渗透率对于钻井液漏失速率的影响。研究结果表明:裂缝开度越大,漏失速率越大;裂缝法向刚度越小,在相同压差下裂缝的开度越大,漏失速率越大;基质孔隙度越大,裂缝向基质中的窜流量越大,井筒的漏失速率下降越缓慢;基质渗透率越大,初始阶段的漏失速率越大。研究结果对于降低碳酸盐岩裂缝—孔隙性地层钻井液漏失有理论指导意义。
Based on the dual-porosity mechanism,a 2D mud loss model for fracture-pore formation is established to research the mud loss during drilling operation in carbonate formation. This mud loss model is used to analyze the effects of fracture aperture,normal stiffness,matrix porosity and permeability on mud loss rate. Research indicates that the mud loss rate increases with the increase of fracture aperture. Mud loss rate increases with the decrease of fracture normal stiffness and the increase of fracture aperture under constant pressure drawdown. The wellbore mud loss rate slows down with the increase of matrix porosity and fracture-to-matrix channeling flow rate. The initial mud loss rate increases with the increase of matrix permeability. This research could provide a theoretical guidance for reducing mud loss in carbonate fracture-pore formation.
出处
《特种油气藏》
CAS
CSCD
北大核心
2016年第6期133-135,140,共4页
Special Oil & Gas Reservoirs
基金
中国石油天然气集团公司重点科技攻关项目"高温高密度钻井液与可排放海水基钻井液成套技术研发"(2013E-3802)
