欢西油田热采井套损机理及影响因素分析
发布时间：2018-07-17 08:39
【摘要】：套损的预防与控制一直是国内外各大油田致力研究与迫切想要解决的问题,套损不仅造成储量可动用程度和开发效果的下降。而且阻碍油田稳产与提高采收率措施的应用。我国每年在补钻更新井和套损井的修复上投入了庞大的资金,套损严重阻碍了油田开发经济效益的提高。导致套管损坏的主要原因有三方面:地质条件、工程条件和套管腐蚀。而且钢材的质量、防砂的方式和射孔方式等因素也可能致使套管损坏。对于稠油热采井,致使套管发生损坏的原因更为复杂。国内外专家在热采井的套损机理方面做了大量的研究工作并取得了丰硕的成果,但是大多数研究均是针对单物理场进行研究,而热-流-固三场耦合作用下的热采井套损机理及影响因素还有待完善。因此本文针对欢西油田系统的研究了热-流-固三场耦合作用下热采井套损机理及其影响因素,主要进行了以下几个方面的研究工作:(1)综合固体力学、流体力学和热力学知识得到热采井应力、渗流、温度方程和边界条件,首先建立了热采井固-流与固-热耦合方程,然后建立了热采井热-流-固三相耦合方程,并对热采井套管的受力情况进行了分析,为有限元模拟奠定理论基础;(2)利用有限元模拟仿真软件,建立了注汽井套管-水泥环-地层有限元模型,对注汽井套管受力和变形规律进行了模拟研究,并对比分析了注汽前后套管的有效应力和径向位移变化。(3)分析了注汽后套管-水泥环-地层系统径向和轴向上温度分布规律,并模拟研究了注汽湿度、注汽速度、注汽温度和井底压力对套管有效应力和径向位移的影响规律,为油田预防套损提供了理论依据。
[Abstract]:The prevention and control of casing damage is always the problem that each big oil field at home and abroad devotes to research and urgent want to solve. Casing loss not only causes the decrease of reserves availability and development effect. It also hinders the application of measures to stabilize oil production and enhance oil recovery. A huge amount of money has been invested in the repair of replacement wells and casing damaged wells in China every year. The casing damage seriously hinders the improvement of economic benefits of oilfield development. The main causes of casing damage are geological conditions, engineering conditions and casing corrosion. The quality of steel, sand control and perforation may also cause casing damage. For heavy oil thermal recovery wells, the causes of casing damage are more complicated. Experts at home and abroad have done a great deal of research on the casing damage mechanism of thermal recovery wells and achieved fruitful results, but most of the studies are focused on the single physical field. However, the casing damage mechanism and influencing factors of thermal recovery wells under thermal-fluid-solid coupling still need to be improved. Therefore, in this paper, the mechanism of casing damage and its influencing factors under thermal-fluid-solid coupling in Huanxi Oilfield system are studied. The main research work is as follows: (1) Comprehensive solid mechanics; The stress, seepage, temperature equation and boundary conditions of thermal recovery well are obtained by the knowledge of fluid mechanics and thermodynamics. At first, the solid-heat coupling equation of thermal recovery well is established, and then the thermal-fluid-solid three-phase coupling equation of thermal recovery well is established. The stress of casing in thermal recovery well is analyzed to lay a theoretical foundation for finite element simulation. (2) the finite element model of steam injection well casing cement ring and formation is established by using finite element simulation software. The stress and deformation of steam injection well casing are simulated, and the effective stress and radial displacement of casing before and after steam injection are compared and analyzed. (3) the radial and axial upward temperature distribution of casing cement ring-formation system after steam injection is analyzed. The effects of steam injection humidity, steam injection velocity, steam injection temperature and bottom hole pressure on casing effective stress and radial displacement are simulated and studied, which provides a theoretical basis for preventing casing damage.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358
本文编号：2129840
[Abstract]:The prevention and control of casing damage is always the problem that each big oil field at home and abroad devotes to research and urgent want to solve. Casing loss not only causes the decrease of reserves availability and development effect. It also hinders the application of measures to stabilize oil production and enhance oil recovery. A huge amount of money has been invested in the repair of replacement wells and casing damaged wells in China every year. The casing damage seriously hinders the improvement of economic benefits of oilfield development. The main causes of casing damage are geological conditions, engineering conditions and casing corrosion. The quality of steel, sand control and perforation may also cause casing damage. For heavy oil thermal recovery wells, the causes of casing damage are more complicated. Experts at home and abroad have done a great deal of research on the casing damage mechanism of thermal recovery wells and achieved fruitful results, but most of the studies are focused on the single physical field. However, the casing damage mechanism and influencing factors of thermal recovery wells under thermal-fluid-solid coupling still need to be improved. Therefore, in this paper, the mechanism of casing damage and its influencing factors under thermal-fluid-solid coupling in Huanxi Oilfield system are studied. The main research work is as follows: (1) Comprehensive solid mechanics; The stress, seepage, temperature equation and boundary conditions of thermal recovery well are obtained by the knowledge of fluid mechanics and thermodynamics. At first, the solid-heat coupling equation of thermal recovery well is established, and then the thermal-fluid-solid three-phase coupling equation of thermal recovery well is established. The stress of casing in thermal recovery well is analyzed to lay a theoretical foundation for finite element simulation. (2) the finite element model of steam injection well casing cement ring and formation is established by using finite element simulation software. The stress and deformation of steam injection well casing are simulated, and the effective stress and radial displacement of casing before and after steam injection are compared and analyzed. (3) the radial and axial upward temperature distribution of casing cement ring-formation system after steam injection is analyzed. The effects of steam injection humidity, steam injection velocity, steam injection temperature and bottom hole pressure on casing effective stress and radial displacement are simulated and studied, which provides a theoretical basis for preventing casing damage.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358
【参考文献】
相关期刊论文 前1条
1 李敬元，李子丰，马兴瑞，黄文虎，吴德华，，黄跃芳，芮松云;热采井注汽管柱力学分析[J];工程力学;1998年03期
本文编号：2129840
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