长裸眼油基钻井液完井投产技术研究及应用  

Research and Application of Long Open Hole Oil Based Drilling Fluid Completion and Production Technology

作　　者：杜鹏 谢中成 黄召 李舜水 王涛 李艳飞 何剑宏 DU Peng;XIE Zhongcheng;HUANG Zhao;LI Shunshui;WANG Tao;LI Yanfei;HE Jianhong(SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai,200120,China;CNOOC(China)Limited Shanghai Branch,Shanghai 200335,China)

机构地区：[1]中国石油化工股份有限公司上海海洋油气分公司,上海200120 [2]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《海洋石油》2024年第4期77-82,共6页Offshore Oil

基　　金：“十三五”国家重大科技专项“东海深层低渗-致密天然气钻井测试及储层改造关键技术”(2016ZX05027-003);国家863计划项目“海上大位移井钻完井关键技术开发与集成”(2012AA091501)。

摘　　要：X气田是中国海洋石油开发的一个重要区域,主力储层HG组属于低孔中低渗到特低孔特低渗储层,非均质性强,产能释放待提升,为保障该气田的开发,实施了一批大斜度定向井、水平井以及大位移井,裸眼段长度平均超过1 200 m。针对气田储层由于物性条件差,容易受到污染导致造成储层伤害,大斜度段岩屑床及油泥堆积导致井筒清洁难度大、水平井长裸眼段油基钻井液返排时间长、天然气冷放空风险大等难题,通过开展储层伤害因素及机理分析、油基钻井液性能优化及储层保护效果评价、井身结构及井眼轨迹优化,优化下部完井管柱结构,创新井眼高效清洁技术及高效返排技术,首次规模化实施长裸眼油基钻井液完井,保障了X气田安全高效建产,达到了优异的产能释放效果。应用表明,该项技术能有效助力低渗油气田经济有效开发,可在类似油气田进行推广。X gas field is an important area for China's offshore oil development,with the main reservoir HG group being a low porosity,medium-low permeability to ultra-low porosity,and ultra-low permeability reservoir.The reservoir has strong heterogeneity and production capacity needs to be improved.In order to ensure the development of the gas field,a number of high inclination directional wells,horizontal wells,and extended-reach wells,whose average open hole length exceed 1 200 m,have been implemented.In response to the challenges of reservoir damage caused by poor physical properties,susceptibility to contamination,difficulty in wellbore cleaning due to high inclination rock debris beds and oil mud accumulation,long backflow time of oil-based drilling fluid in the long open hole section of horizontal wells,and high risk of natural gas cold venting,we conducted analysis of reservoir damage factors and mechanisms,optimization of oil-based drilling fluid performance and evaluation of reservoir protection effect,optimization of wellbore structure and well trajectory,optimization of lower completion string structure,innovation of high-efficiency cleaning technology and high-efficiency flowback technology for wellbore.The long open hole oil-base drilling fluid completion operations have been implemented for the first time on a large scale.And it ensured the safe and efficient production of X gas field and led to excellent capacity release effect.The application shows that this technology can effectively assist in the economic and effective development of low-permeability oil and gas fields,and can be promoted in similar oil and gas fields.

关 键 词：裸眼完井 油基钻井液 储层伤害 井眼清洁 打孔管 返排 

分 类 号：TE254[石油与天然气工程—油气井工程]