四川盆地高含硫气井完整性管理技术与应用——以龙岗气田为例  

The integrity management technology and application of high-sulfur gas wells in the Longgang Gas Field,Sichuan Basin

作　　者：马发明[1] 佘朝毅[1] 郭建华[1,2] 

机构地区：[1]中国石油西南油气田公司采气工程研究院 [2]西南石油大学

出　　处：《天然气工业》2013年第1期122-127,共6页Natural Gas Industry

基　　金：国家示范工程"四川龙岗地区大型碳酸盐岩气田开发示范工程"(编号:2011ZX05047);国家科技重大专项"复杂碳酸盐岩气藏开发技术"(编号:2011ZX05015-003)

摘　　要：近年来,高酸性天然气井越来越多,但因技术和施工的瑕疵,往往导致气井功能不完整(如套管环空异常带压等),已成为影响气井安全生产的重要问题。为此,在消化吸收国内外先进完整性管理理念的基础上,结合四川盆地龙岗气田高温(130～150℃)、超深(6 200m)、高含硫(30～156g/m3)、地层因素复杂等特点,从带压原因分析、井筒安全评估内容和流程、风险等级划分和防控措施等方面开展了气井完整性管理技术的研究与应用。制订了气井完整性管理相应的对策,即:对于已完成的老井加强压力、流体跟踪评价分析,加强井下及井口腐蚀状况监测、检测工作,定期对井筒安全状态进行评估,确保安全受控;对于待完成的新井,重点抓好井身结构、完井管柱设计与现场施工作业质量控制等环节,确保不形成新的环空异常带压气井。现场应用结果表明,形成的气井完整性管理方法及主体配套技术能够满足龙岗气田安全生产的需要。In recent years, there are more and more high sour gas wells, but due to flaws in technology and operation, unusual occurrence such as the abnormal annular pressure will badly influence the safe production of such wells. In view of this, based on the in detailed explanation of the concept of advanced integrity management at home and abroad, this paper first analyzes the characteristics of the Longgang Gas Field, Sichuan Basin, such as high temperature （130 - 150℃）, ultra depth （6200 m）, high sulfur content （30 - 156 g/m3） and complex geological condition. On this hasis, the research and application of the integrity management for gas wells is conducted in the aspects of reason analysis of abnormal annular pressure, content and workflow of borehole safety assessment, risk level classification, and prevention and controlling methods. Accordingly, the following corresponding countermeasures are laid out for the integrity management of gas wells. （1） As for those completed mature wells, the follow-up evaluation analysis of downhole pressure and fluids should be made, while downhole and wellhead corrosion should be supervised and inspected as well and the downhole safety should be regularly assessed and guaranteed. （2） As for those new wells to be completed, high attention should be paid to casing program design, completion string design, quality control of field operation, etc. , in order to avoid the occurrence of ab normal annular pressure in wells. The field application shows that the said integrity management for gas wells and the above countermeasures can completely meet the requirement for safe production of the Longgang Gas Field.

关 键 词：四川盆地 龙岗气田 高含硫气井 完整性管理 环空带压 评估与完整性 安全生产 

分 类 号：TE37[石油与天然气工程—油气田开发工程]