西湖凹陷油基钻井液环境下地层流体污染率校正的方法与应用  

Innovative Method and Application of Fluid Contamination Correction under Oil-based drilling fluid Environment in Xihu Sag

作　　者：何玉春 蔡军 鲁法伟 王雷 高蓓 He Yuchun;Cai Jun;Lu Fawei;Wagn Lei;Gao Bei(Shanghai Branch,CNOOC Limited Company,Shanghai 200335;Schlumberger China,Beijing 100015)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335 [2]斯伦贝谢中国公司,北京100015

出　　处：《石化技术》2023年第6期176-179,共4页Petrochemical Industry Technology

摘　　要：东海自2019年开始采用油基泥浆钻井液体系来提高低孔渗储层流体评价,通过1年的地层测试作业验证,效果突出。然而在油基泥浆环境下烃类物质和油基白油相似相溶,对地层流体产生了污染,油藏流体性质无法获取;本文通过案例分析,首次基于白油实验提出饱和烃色谱的烃组分单参数与多参数污染率计算模型,经验证该方法评价的结果与其他方法一致;其次,首次揭示了井下光谱分析地层流体污染率与饱和烃气相色谱污染率差异大的原因,并对污染率差异大的数据点,提出采用饱和烃特征峰面积法计算得到的污染率来校正井下光谱计算的污染率;进一步提高油基钻井液环境下地层流体污染率的评价精度。这项技术方法可以应用到后期的勘探工作中,提高流体识别及地层流体污染率的精度与准确度。In recent years,oil-base drilling fluid has been used in the East China Sea to improve the fluid evaluation of low porosity and permeability reservoir.Due to the similar solubility of hydrocarbon and oil-based white oil,the properties of formation fluid cannot be accurately obtained.In this paper,a single parameter and multiparameter pollution rate calculation model of hydrocarbon components in saturated hydrocarbon chromatography based on white oil experiment is proposed for the first time.For the first time,the reasons for the big difference between the formation fluid pollution rate and the saturated hydrocarbon gas chromatography pollution rate are revealed,and the pollution rate calculated by the characteristic peak area method of saturated hydrocarbon is proposed to correct the pollution rate calculated by the downhole spectrum.The technical achievements in this paper can be applied to the subsequent exploration work to improve the accuracy and accuracy of fluid identification and formation fluid contamination rate.

关 键 词：近红外光谱分析 气相色谱 油基泥浆污染率 污染率校正 

分 类 号：TE52[石油与天然气工程—油气田开发工程]