三嗪溶液脱硫新工艺在长庆气区的研究与实践

A novel desulfurization-based triazine solution and its application to Changqing gas zone

为了充分认识三嗪溶液脱硫应用机理,准确掌握三嗪溶液的硫容、最佳反应温度及适用的H2S浓度范围,为国内低潜流量天然气脱硫技术提供有益参考,以在长庆气区苏里格气田低潜流量天然气井场和站场进行的三嗪溶液脱硫试验为研究对象,通过在小试、井场和站场3种新型液体脱硫装置中的应用,分析了三嗪溶液的现场脱硫效果。研究结果表明:①三嗪溶液脱硫具有硫容高、脱硫迅速、无需再生、脱硫产物无毒、可直接回注地层等优点,在国内低潜流量天然气脱硫领域具有较好的应用前景;②研发了小试装置测试了8种不同配方三嗪溶液的硫容,研发了井场和站场三嗪液体脱硫装置,现场应用效果较好;③三嗪溶液脱硫工艺作为一种新型的脱硫技术已经成功应用于苏里格气田边远下古生界气井及集气站的低潜流量天然气脱硫,随着应用逐渐规模化以及配方技术进步,其成本逐步降低、硫容逐步提高,未来应用范围将进一步拓宽。

In order to fully understand the desulfurization mechanism of triazine solution,accurately make clear the sulfur capacity,optimal reaction temperature,and available H2S concentration range,and provide beneficial reference for domestic desulfurization technologies used for natural gas with low sulfur throughputs,this study took the triazine solution based on desulfurization test in well sites and stations of natural gas with low sulfur throughputs in Sulige gasfield as an objective to analyze the desulfurization effect via this triazine solution in three new types of fluid desulfurization devices respectively used in lab tests,well sites,and stations.Results show that(1)this desulfurization-based triazine solution has the advantages of high sulfur capacity,fast desulfurization,no regeneration required,nonioxic desulfurization product,and direct injection into strata.Moreover,its application to domestic desulfurization of natural gas with low sulfur throughputs is more promising;(2)some lab device is developed to test the sulfur capacity with eight formulas of triazine solution,and the solution based on desulfurization devices suitable for well sites and stations are developed.And their application effects are better;and(3)as a novel technology,this solution has been successfully applied to some remote Lower Paleozoic gas wells and gas-gathering stations in Sulige gasfield.And with an increase of application scale and an improvement of formula technologies,its cost and the sulfur capacity will individually decrease and increase step by step,so its application will get broader in the future.