油基钻井液体系轻烃组分分配系数计算及应用  

Calculation and application of partition coefficients of light hydrocarbons in oil-based mud system

作　　者：ABDALLAH Bacem Rabie Ben AHMADI Riadh LYNEN Frederic REKHISS Farhat ABDALLAH Bacem Rabie Ben;AHMADI Riadh;LYNEN Frederic;REKHISS Farhat(Laboratoire LR3E.Ecole Nationale d’Ingénieurs de Sfax,Rte Soukra km 3,Sfax,Tunisia;Separation Science Group,Department of Organic and Macromolecular Chemistry,Ghent University,Krijgslaan 281-S4,B-9000 Ghent,Belgium)

机构地区：[1]突尼斯斯法克斯国家工程学院LR3E实验室,斯法克斯3000,突尼斯 [2]比利时根特大学有机与高分子化学系,根特9000,比利时

出　　处：《石油勘探与开发》2022年第4期787-797,共11页Petroleum Exploration and Development

摘　　要：采用一种基于静态顶空气相色谱技术的热力学方法研究了油基钻井液、地层流体和钻井液气体之间的关系,计算了两种油基钻井液-空气体系nC_(5)—nC_(8)范围内47种轻烃组分的分配系数,在热力学平衡条件下开展原始地层流体组分重构。研究表明,油基钻井液对钻井液气体中nC_(5)—nC_(8)范围内的地层流体组分的影响很小,对于低毒性合成油基钻井液,影响小于1%,对于柴油基钻井液,影响小于10%。对于多数轻烃组分,采用气相校准法和直接定量法确定的分配系数的误差小于10%,直接定量法计算的分配系数更准确。两种原油样品重构组分与真实组分之间的匹配度分别为91%和89%,证明利用nC_(5)—nC_(8)范围内轻烃组分分配系数通过静态顶空分析重构原始地层流体组分的可行性和准确性较高。To find out the relationship between the oil-based mud,the formation fluid and the extracted gas,we use a thermodynamic approach based on static headspace gas chromatography technique to calculate the partition coefficients of 47 kinds of light hydrocarbons compounds between nC5 and nC8 in two kinds of oil-based mud-air systems,and reconstruct the original formation fluid composition under thermodynamic equilibrium.The oil-based drilling mud has little effect on the formation fluid compositions in the range of nC5-nC8(less than 1%for low-toxicity oil-based mud and less than 10%for oil-based mud).For most light hydrocarbon compositions,the partition coefficients obtained by vapor phase calibration and the direct quantitative methods have errors of less than 10%,and the partition coefficients obtained by direct quantitative method are more accurate.The reconstructed compositions of the two kinds of crude oil have match degrees of 91%and 89%with their real compositions,proving the feasibility and accuracy of reconstructing the composition of original formation fluid by using partition coefficients of light hydrocarbon compositions between nC5 and nC8.

关 键 词：油基钻井液 钻井液气体 轻烃组分 分配系数 地层流体 

分 类 号：TE142[石油与天然气工程—油气勘探]