钻井液与完井液2024，Vol.41Issue(1)：45-52,8.DOI:10.12358/j.issn.1001-5620.2024.01.004
复杂压力系统薄互层致密油藏水平井钻井关键技术
Key Technologies for Drilling Horizontal Wells in Thin Interbedded Tight Reservoirs with Complex Pressure Systems
摘要
Abstract
The Sha-3 member V reservoir in the Gaoliu block,Nanpu sag is a typical interlayered thin sandstone and thin claystone tight reservoir with complex formation pressure systems and densely distributed artificial fractures resulted from many years of fracturing and injection operations.Horizontal drilling in this area is faced with problems such as mud losses,oil and water kicks as well as collapse of borehole walls.This paper describes,based on the formation characteristics of the Gaoliu block,the technical difficulties in horizontal drilling,and points out the causes of mud losses and borehole wall collapse.To solve these problems,an oil based drilling fluid was formulated with a nanometer/micrometer sized emulsified borehole wall collapse preventing agent,graphite microspheres,a micrometer flexible plugging agent and calcium carbonate of ultrafine particles,which render the drilling fluid capacities such as plugging,high pressure bearing and borehole wall stabilizing.The oil based drilling fluid has low filtration rate and has the ability of maintaining the strengths of the claystones that is 5 times higher than other drilling fluids.With this drilling fluid,the pressure bearing capacity of the sandstones of medium and high permeability can be increased to 18 MPa.Bridging and solidification mud loss control techniques were used to control mud losses.Using this drilling fluid,horizontal drilling through the tight reservoirs in the Gaoliu block was safely performed and no borehole wall collapse was encountered during drilling in more than ten wells.In formations where mud losses were encountered,the mud losses were controlled and the pressure bearing capacity of the formation was increased by 5.4 MPa,satisfying the requirement of subsequent drilling.关键词
致密油藏/复杂压力系统/水平井/坍塌/井漏/油水侵Key words
Tight reservoir/Complex pressure system/Horizontal well/Collapse/Mud loss/Oil and water kick分类
能源科技引用本文复制引用
吴晓红,李云峰,周岩,阚艳娜,李然,罗成..复杂压力系统薄互层致密油藏水平井钻井关键技术[J].钻井液与完井液,2024,41(1):45-52,8.基金项目
中石油重大科技专项"低渗/致密油藏大幅度提高采收率关键技术研究"(2023ZZ17) （2023ZZ17）
冀东油田公司重大项目"高深北区高5断块Ⅴ油组致密油效益开发关键技术研究与矿场试验"(KF2022A02). （KF2022A02）
