含硫气井井筒堵塞原因分析及解堵措施研究  

Analysis of reasons for wellbore blockage in sulfur-containing gas wells and research on blockage removal measures

作　　者：马中国 卢川 刘佳丽 杨森 MA Zhong-guo;LU Chuan;LIU Jia-li;YANG Sen(Oil and Gas Exploration Company,Gas Production Plant No.4,Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Yan'an 727501,China)

机构地区：[1]延长石油(集团)有限责任公司油气勘探公司延长气田采气四厂,陕西延安727501

出　　处：《化学工程师》2024年第4期54-57,共4页Chemical Engineer

基　　金：延长石油(集团)有限责任公司重点项目(ycsy2021ky-B-38)。

摘　　要：为进一步提高含硫气井的产气量,以西部某气田高含硫气井为研究对象,针对含硫气井井筒堵塞的原因进行了分析,有针对性的研究了合适的解堵增产措施,并成功将其进行了现场应用。结果表明,目标含硫气井井筒现场堵塞物的成分较为复杂,井筒堵塞原因主要是硫和沥青等有机物的沉积以及地层产出矿物CaCO3和腐蚀产物FeS2等无机堵塞物的产生所造成的。活性酸复合解堵体系对模拟无机堵塞物、模拟有机堵塞物和现场井筒堵塞物均具有良好的溶解效果,反应时间为12h时,溶解率均能达到90%以上。另外,活性酸复合解堵体系还具有良好的表面活性和防腐蚀性能,在40~100℃条件下老化后的表面张力值均小于25mN·m^(-1),在2~12h的时间内对N80钢片的腐蚀速率均小于5g·(m^(2)·h)^(-1)。现场5口含硫气井实施活性酸复合解堵措施后,平均日产气量提高了43.3%,并且措施有效期较长,达到了良好的施工效果。In order to further improve the gas production of sour gas wells,a high sour gas well in a certain gas field in the western region was taken as the research object.The reasons for wellbore blockage in sour gas wells were analyzed,and appropriate measures to remove blockage and increase production were targeted and successfully applied on site.The results show that the composition of on-site plugging materials in the target sour gas well is relatively complex,and the main reasons for wellbore plugging are the deposition of organic substances such as sulfur and asphalt,and the generation of inorganic plugging materials such as mineral calcium carbonate and corrosion product iron disulfide produced in the formation.The active acid composite blockage removal system has good dissolution effects on simulated inorganic blockage,simulated organic blockage,and on-site wellbore blockage.When the reaction time is 12 hours,the dissolution rate can all reach over 90%.In addition,the active acid composite unblocking system also has good surface activity and anti-corrosion performance.The surface tension values after aging at 40℃~100℃are all less than 25mN·m^(-1),and the corrosion rate of N80 steel sheets is less than 5g·(m^(2)·h)^(-1)within 2 hours to 12 hours.After implementing active acid composite blockage removal measures in 5 sulfur-containing gas wells on site,the average daily gas production increased by 43.3%,and the effective period of the measures was longer,achieving good construction results.

关 键 词：含硫气井 井筒堵塞 有机堵塞物 硫沉积 解堵措施 

分 类 号：TE377[石油与天然气工程—油气田开发工程] TE358