油基钻井液中碱式碳酸锌除硫作用机制分析OA
Evaluation of Sulfide Removing Rate by Basic Zinc Carbonate in Oil Based Drilling Fluids and Analyses of Sulfide Removing Mechanisms
碱式碳酸锌是高含硫地层水基钻井液常用除硫剂,其在油基钻井液中的除硫能力和作用机制尚不明晰.针对传统评价方法中硫化氢浓度和流量偏低、适用温度不高、反应时间过短等不足,搭建了适用于深井钻井液除硫率评价的实验平台;利用钻井液除硫率评价实验平台,测试了碱式碳酸锌在油相、水相、油包水乳液及油基钻井液中的除硫率;基于除硫率实验结果,分析了硫化氢在油包水乳液中的存在形式,厘清了中性及弱碱性水相环境中碱式碳酸锌除硫反应机制,进而揭示了油基钻井液中碱式碳酸锌除硫作用机制.结果表明,油基钻井液中碱式碳酸锌除硫率可达 100%;侵入油基钻井液的硫化氢大部分(>90%)以未离解硫化氢分子形式存在于油相中,少部分硫化氢(<10%)溶解于水相中并离解形成以HS-为主的离子;水相中碱式碳酸锌电离出的 Zn2+离子直接与硫化氢一级电离产物 HS-离子发生反应生成 ZnS沉淀,水相高 pH值并非为除硫的必要条件;反应-扩散耦合作用是油基钻井液中碱式碳酸锌的主要机制;温度升高有助于提高除硫效率.揭示的油基钻井液中碱式碳酸锌除硫作用机制,为碱式碳酸锌用作油基钻井液除硫剂提供了科学依据.
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.
张震;尹达;秦国川;陈林;王贵
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,新疆库尔勒 841000||新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心,新疆库尔勒 841000||新疆超深油气重点实验室,新疆库尔勒 841000||中国石油塔里木油田公司,新疆库尔勒 841000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,新疆库尔勒 841000||新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心,新疆库尔勒 841000||新疆超深油气重点实验室,新疆库尔勒 841000||中国石油塔里木油田公司,新疆库尔勒 841000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,新疆库尔勒 841000||新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心,新疆库尔勒 841000||新疆超深油气重点实验室,新疆库尔勒 841000||中国石油塔里木油田公司,新疆库尔勒 841000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,新疆库尔勒 841000||新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心,新疆库尔勒 841000||新疆超深油气重点实验室,新疆库尔勒 841000||中国石油塔里木油田公司,新疆库尔勒 841000西南石油大学石油与天然气工程学院,成都 610500
能源科技
油基钻井液碱式碳酸锌硫化氢除硫率除硫机制
Oil-based drilling fluidBasic zinc carbonateHydrogen sulfideRate of sulfide scavengingMechanism of sulfide scavenging
《钻井液与完井液》 2026 (2)
202-208,7
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)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).
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