钻井液与完井液2026，Vol.43Issue(2)：202-208,7.DOI:10.12358/j.issn.1001-5620.2026.02.008
油基钻井液中碱式碳酸锌除硫作用机制分析
Evaluation of Sulfide Removing Rate by Basic Zinc Carbonate in Oil Based Drilling Fluids and Analyses of Sulfide Removing Mechanisms
摘要
Abstract
Basic zinc carbonate is a commonly used sulfide scavenger for drilling high-sulfide content formations with water-based drilling fluids,its ability to remove sulfide and the mechanism of sulfide removal in oil-based drilling fluids are still not well understood.In evaluating the rate if hydrogen sulfide removal,conventional methods use relatively low concentration and flow rate of hydrogen sulfide,the results of these methods are not suitable for high temperature application,and the reaction time in these methods is too short.To overcome these deficiencies of the old evaluation methods,a new experimental platform for evaluating the rate of sulfide scavenging of deep-well drilling fluids has been constructed.Using this platform,the rates of sulfide scavenging of basic zinc carbonate in oil,water,water-in-oil emulsion and oil-based drilling fluid were tested;the test results were used to analyze the existence forms of hydrogen sulfide in water-in-oil emulsions,the sulfide scavenging mechanisms of basic zinc carbonate in neutral and weakly-alkaline aqueous phases were clarified,and the sulfide scavenging mechanism of basic zinc carbonate in oil-based drilling fluids was then revealed.The test results show that the rate of sulfide scavenging of basic zinc carbonate in oil-based drilling fluids can be as high as 100%;most of the hydrogen sulfide(>90%)invading into an oil-based drilling fluid exists as undissociated hydrogen sulfide molecules in the oil phase of the oil-based drilling fluid,and only a small fraction(<10%)of the invading hydrogen sulfide dissolves into the aqueous phase to form ions dominated by HS-.In the aqueous phase of an oil-based drilling fluid,the Zn2+ions ionized from basic zinc carbonate react directly with the primary ionization product HS-of hydrogen sulfide to form ZnS precipitate,and a high pH of the aqueous phase is not a necessary condition for sulfide scavenging;the reaction-diffusion coupling effect is the primary mechanism of sulfide scavenging by basic zinc carbonate in oil-based drilling fluids,and temperature increase is helpful to enhance the rate of sulfide scavenging.The revealed working mechanism of basic zinc carbonate in oil-based drilling fluids provides a scientific basis for using this chemical as a sulfide scavenger in oil-based drilling fluids.关键词
油基钻井液/碱式碳酸锌/硫化氢/除硫率/除硫机制Key words
Oil-based drilling fluid/Basic zinc carbonate/Hydrogen sulfide/Rate of sulfide scavenging/Mechanism of sulfide scavenging分类
能源科技引用本文复制引用
张震,尹达,秦国川,陈林,王贵..油基钻井液中碱式碳酸锌除硫作用机制分析[J].钻井液与完井液,2026,43(2):202-208,7.基金项目
中国石油天然气集团有限公司科学研究与技术开发项目"万米超深层油气资源钻完井关键技术与装备研究"(2022ZG06) （2022ZG06）
中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心项目"除硫剂科学评价方法及应用研究"(2023510104000512). （2023510104000512）
