油基钻井液高效除硫体系优化实验

Optimization experiment of efficient hydrogen sulfide removal system for oil-based drilling fluid

目的解决川东北含硫气藏在钻井过程中存在的H2S污染油基钻井液、H2S溢出造成的安全风险问题。方法建立了H2S污染油基钻井液室内评价方法和评价参数,优选了油基钻井液用高效除硫剂和复合除硫体系配方。结果除硫效果优异的单剂为液体除硫剂YT-1、碱式碳酸锌JD-2、醇醚酰胺CLC,饱和度分别为56.48 mg/g、21.13 mg/g、5.8 mg/g,高温老化除硫率分别为90.10%、82.60%和75.23%,与油基钻井液配伍性良好。优化形成的复合除硫体系配方4%(w)YT-1+2%(w)JD-2,在质量浓度为75 mg/L的H2S污染油基钻井液后,出口质量浓度达到0.015 mg/L所用时间仅为1.21 min,加入复合除硫体系后,该时间则达到171.8 min。污染后的油基钻井液高温老化后H2S质量浓度为0.078 mg/L,加入复合除硫体系后,H2S质量浓度为0 mg/L,除硫率达100%。结论除硫单剂协同作用提高除硫效果,为川东北地区高含硫地层“安全、高效”钻井提供了技术保障。

Objective The sulfur remover suitable for oil-based drilling fluid was studied to solve the problems,such as pollution of oil-based drilling fluid by hydrogen sulfide and safety risk caused by hydrogen sulfide overflow in the drilling process of sulfur-bearing gas reservoir in northeastern Sichuan.Methods The evaluation method and parameters of oil-based drilling fluid contaminated by hydrogen sulfide were established.The formulation of high efficiency sulfur removal agent and compound sulfur removal system for oil-based drilling fluid were optimized.Results The single agents with excellent sulfur removal effect were liquid sulfur removal agent YT-1,zinc carbonate basic JD-2 and alcohol ether amide CLC,with the saturation of 56.48 mg/g,21.13 mg/g and 5.8 mg/g,respectively,the high temperature aging sulfur removal rates of 90.10%,82.60%and 75.23%,and they showed good compatibility with oil-based drilling fluid.The compound sulfur removal system formulation of 4%YT-1+2%JD-2 was optimized.For the 75 mg/L hydrogen sulfide contaminated oil-base drilling fluid,the time to reach the outlet concentration of 0.015 mg/L was only 1.21 min,which reached 171.8 min after adding the compound sulfur removal system.The H 2S concentration of the contaminated oil-based drilling fluid was 0.078 mg/L after high temperature aging,and the H 2S concentration was 0 mg/L after adding the compound sulfur removal system,and the sulfur removal rate reached 100%.Conclusions The single agent of sulfur removal can improve the sulfur removal effect,providing technical support for the safe and efficient drilling in the high sulfur formation in northeastern Sichuan.