随钻地层测试在大斜度井油基钻井液中的应用  

Application of formation testing while drilling in highly deviated wells with oil-based drilling fluid

作　　者：吴进波 陈鸣 孙殿强 王锋 周基恒 WU Jinbo;CHEN Ming;SUN Dianqiang;WANG Feng;ZHOU Jiheng(Zhanjiang Branch of CNOOC(China)Limited,Zhanjiang 524057,Guangdong,China;Baker Hughes(China)Oilfield Technology Services Co.Ltd,Beijing 100028,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]贝克休斯(中国)油田技术服务有限公司

出　　处：《石油钻采工艺》2022年第2期178-185,共8页Oil Drilling & Production Technology

摘　　要：南海西部油田滚动勘探部署大斜度井兼探多个目的层位,并利用高密度油基钻井液保障井壁稳定性,采用常规电缆地层测试作业风险高、难度大,而且常规的声波、密度、电阻率探头难以准确区别地层油与油基钻井液滤液,难以保障取到合格资料,因此需要应用随钻测井取样技术。FASTrak Prism随钻测压取样工具可随钻具组合入井,克服了电缆测井作业遇阻遇卡问题,随钻光谱技术可通过多通道光密度测量判断流体含气量(甲烷)实现地层原油准确识别。通过FASTrak Prism随钻测压取样技术在南海西部油田储量评价中的应用案例,展示了借助随钻光谱探头快速区分油基钻井液滤液和地层油的方法,可以为勘探开发一体化储量评价提供地层压力、储层物性和流体性质等关键资料,验证了该项技术在南海西部油田勘探开发一体化中实施的可行性。Highly deviated well is deployed in the rolling exploration of western South China Sea oilfield to simultaneously probe into multiple layers,and high-density oil-based drilling fluid is used to maintain wellbore stability.Under such circumstances,the conventional wireline formation testing has high operation risks and difficulties,and the conventional sonic,density and resistivity sensors have trouble in accurately distinguishing formation oil and filtrate of oil-based drilling fluids.Therefore,the sampling-whiledrilling technique is required to ensure the acquisition of qualified data.The FASTrak Prism,a tool for pressure measurement and sampling while drilling,can run in hole with the BHA and overcome the sticking and blockage issues of wireline well logging.The spectrometry-while-drilling technique enables accurately identifying the formation oil by measuring the(methane) gas content of fluids via the multi-channel density measurement.The field application of the FASTrak Prism-based pressure measurement and sampling while drilling in the reserves assessment for western South China Sea oilfield demonstrates how to rapidly differentiate filtrate of oil-based drilling fluids and formation oil with the help of the spectrometry-while-drilling sensor,and this technique can help to gain key data,such as formation pressure,reservoir physical properties,and fluid properties,for the exploration-developmentintegrated reserves assessment.The successful application validates the feasibility of the proposed technique in the integrated exploration and development of western South China Sea oilfield.

关 键 词：随钻地层测试 油基钻井液滤液 地层油 大斜度井 保压样品 储量评价 

分 类 号：TE271[石油与天然气工程—油气井工程]