增效型无土相仿生油基钻井液技术的研究与应用  

Research and Application of Enhanced Soil-free Phase Bionic Oil-Based Drilling Fluid Technology

作　　者：蒋官澄[1,2] 黄胜铭 侯博 孟凡金 屈艳平 王浩[3] JIANG Guancheng;HUANG Shengming;HOU Bo;MENG Fanjin;QU Yanping;WANG Hao(School of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Oil and Gas Resources and Exploration,Beijing 102249,China;Changqing Drilling General Company,CNPC Chuanqing Drilling Engineering Co.,Ltd.,Xi′an,Shaanxi 710000,China)

机构地区：[1]中国石油大学(北京)石油工程学院 [2]油气资源与探测国家重点实验室 [3]中国石油川庆钻探工程有限公司长庆钻井总公司

出　　处：《钻采工艺》2024年第2期93-103,共11页Drilling & Production Technology

基　　金：国家自然科学基金重大项目“井筒工作液与天然气水合物储层作用机理和调控方法”(编号:51991361)资助。

摘　　要：针对深井超深井钻井过程中钻遇高温高压、井壁失稳及井下复杂情况的难题,基于仿生学、超分子化学以及岩石表面润湿性理论,通过优选仿生增效剂、仿生提切剂及仿生降滤失剂,配套相关处理剂,最终形成了一套适用于深井、超深井地层钻探的增效型无土相仿生油基钻井液体系。研究发现,建立的增效型无土相仿生油基钻井液体系可抗220℃高温,配制密度为2.4 g/cm^(3),破乳电压大于400 V,高温高压滤失量为3.2 mL,人造岩心在该体系中220℃下老化后的抗压强度达到7.1 MPa,平均渗透率恢复值为93.9%。现场应用情况表明,体系流变性能稳定,平均机械钻速比邻井提高16%,平均井径扩大率仅为1.25%,可有效解决深井超深井钻井过程中出现的井壁失稳难题,为我国深井超深井的钻探提供了技术保障。Aiming at the problems of high temperature and high pressure,borehole instability and downhole complexity in the drilling process of deep and ultra-deep wells,based on the theories of bionics,supramolecular chemistry and rock surface wettability,a set of synergistic soil-free phase bionic oil-based drilling fluid system for deep and ultra-deep wells drilling has been developed through the selection of bionic synergists,bionic cuttings agents and bionic filtration-loss reducing agents and the matching of related treating agents.It is found that the established synergistic soil-free phase oil-based drilling fluid system can resist 220℃high temperature,with a formulation density of 2.4 g/cm^(3),an emulsion breaking voltage of more than 400 V,and a high-temperature and high-pressure filtration loss of 3.2 mL;the compressive strength of man-made cores after aging in the system at 220℃reaches 7.1 MPa;and the average permeability recovery value is 93.9%.Field application shows that the system has stable rheological properties,the average ROP is 16%higher than that of adjacent wells,and the average hole enlargement rate is only 1.25%,which can effectively solve the problem of borehole instability that occurs in the drilling process of deep and ultra-deep wells,and provide technical guarantee for the drilling of deep and ultra-deep wells in China.

关 键 词：深井超深井 油基钻井液 无土相 仿生 增效 

分 类 号：TE254[石油与天然气工程—油气井工程]