摘要
四川盆地元坝气田具有超深、高压、高温、高含酸性腐蚀气体的特点。完井投产过程中,腐蚀条件恶劣,安全风险大,对管柱的材质、结构要求高;井筒条件限制,井筒净化作业的风险大、难度大;施工作业时间长,井控风险大;储层非均质性强,作业井段长,针对性改造难度大。为此,通过对管柱结构、腐蚀机理的研究,选择了4C+4D镍基合金材质油管配合永久式完井封隔器的酸化—投产一体化管柱,满足了酸化、测试及安全投产的需要;通过管柱设计、水动力学的计算,结合工艺措施优化,形成的扫塞、超深小井眼通井工艺等井筒处理工艺技术,满足了井筒净化的需要,保证了投产管柱顺利到位;通过对高含硫气体在临界状态的分析计算,结合现场实践,形成了配套井控安全设备,短起下测油气上窜速度小于30m/h的井控安全工艺措施,保证了投产作业的井控安全;通过暂堵剂的研制和暂堵工艺的优化,形成了多级暂堵交替注入酸化工艺。
The Yuanba Gas Field in the Sichuan Basin is featured by ultra depth, high temperature, high pressure and high acidic cor rosive gas content. In the process of completion and production, high requirements are proposed for string material and structure be cause of harsh corrosive conditions and high safety risks; wellbore constrains bring about a high risk and great difficulty to wellbore cleaning operation; the well control risk is very high due to a long working time; strong reservoir heterogeneity and long working section result in more difficulties in targeted modification. To achieve successful production, based on the research of tubing structure and corrosion mechanism, we adopted the acidification-production integrated string composed of a 4C＋4D nickel-based alloy pipe and a permanent packer, meeting the demand of acidification, testing and safe production. Then, we conducted string design and dy- namic calculation and combined process measure optimization to successfully develop plug elimination, ultra-deep slim-hole drifting, and other wellbore treatment technologies, meeting the requirement of wellbore cleaning and making the production string smoothly reach the designated position. Meanwhile, we developed a complete set of well control safety equipment and well control safety measures （short tripping to measure oil ＆ gas channel-up speed of less than 30 m/h） through the analysis and calculation of high sour gas in critical state and site practice, ensuring well control safety in production. Finally, we developed multistage temporary-plugging alternative injection and acidification process through the development of temporary plugging agent and the optimization of temporary plugging technology.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2014年第7期60-64,共5页
Natural Gas Industry
基金
国家科技重大专项"低渗油气田完井关键技术"(编号:2011ZX05022-006)
关键词
四川盆地
元坝气田
高含硫
超深
高温
高压
完井投产
井筒处理
多级酸化
安全风险控制
Sichuan Basin, Yuanba Gas Field, high H2 S content, ultra-deep, high temperature, high pressure, well completion, production, wellbore treatment, multistage acidification, safety risk control
