土库曼斯坦酸性气田恢复产能工程关键技术  

Key technologies of restoring the productivity of sour gas fields in Turkmenistan

作　　者：邹洪岚[1] 汪绪刚[1] 康健利 朱怀顺[3] 王青华 

机构地区：[1]中国石油勘探开发研究院廊坊分院 [2]中国石油(土库曼斯坦)阿姆河天然气公司 [3]中国科学院渗流流体力学研究所

出　　处：《天然气工业》2009年第9期94-96,共3页Natural Gas Industry

基　　金：中国石油天然气集团公司海外科技攻关项目(编号:2008B-4406)的部分研究成果

摘　　要：土库曼斯坦Sa气田是一个高含H2S与CO2的底水块状碳酸盐岩气田,恢复利用老井产能是第一期产能建设目标的重要保证。该气藏老井封存时间长达13a,修井采气面临井筒腐蚀评价、重新完井、腐蚀与防治、水合物预测等难题,存在较大的技术难度和安全风险。在对33口老井的采气工程进行了分析和评估的基础上,采用MIT/MTT井筒腐蚀评价和生产系统节点分析等方法,针对气田的储层特点和修井采气工程技术的难点,形成了高含硫气田恢复产能工程关键技术,主要包括老井修复与测试配套技术、生产系统优化技术、H2S与CO2的腐蚀与防治技术以及酸性气田高效酸化解堵技术。在已修复的9口井中恢复年产能12×108m3,修复26口井预计恢复年产能(25～30)×108m3,26口老井修复利用至少可节约钻井直接投资8000万美元以上。The gas field Sa in Turkmenistan belongs to a kind of bottom water block carbonate gas field with high H 2S and CO 2.To restore and utilize the productivity of old wells is an important guarantee for the target of the first term productivity construction in the CNPC's project of Turkmenistan.Since the old wells in this gas reservoir were shut in almost 13 years ago,either the workover or the gas production has faced all kinds of technical difficulties and safety risks in terms of wellbore corrosion evaluation,recompletion,corrosion and prevention,and hydrate prediction and control,etc.Based on the analysis of and the evaluation on these 33 old wells,this paper adopted many methods such as MIT/MTT wellbore corrosion evaluation and node analysis of production system to develop a series of key technologies restoring the productivity of high sour gas fields,which mainly include the matching technique of well workover and testing,the optimizing technology of gas production system,the H 2S-and CO 2-corrosion prevention technology,and the breakdown formation technology of sour gas fields by acidification with high efficiency.The annual production of the restored 9 wells is up to 12×108 m3,and the annual production of the restored 26 wells is predicted to be 25-30×108 m3,which at least saves above 80 million US dollars of direct drilling investment.

关 键 词：土库曼斯坦 高含硫气田 采气工程 老井 修井 酸化 生产能力 恢复 

分 类 号：TE377[石油与天然气工程—油气田开发工程]