南二区西部套管损坏机理分析及防护方法研究

发布时间：2018-03-01 10:52

  本文关键词： 套管损坏 压力平衡 注采平衡 拉伸 形变　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：油水井套管损坏给油田的正常生产带来很大的危害,不仅造成经济损失,而且影响开发效果。大庆油田采油一、二、四、六厂曾经发生过成片套损,控制套损速度已经成为油田开发工作的重点内容之一,大庆油田套损机理研究工作从未间断,已经取得了一定成果。但是,机理研究仍然存在局限性和独立性,且大多是定性的研究,研究成果推广应用范围受到一定限制,致使套管保护工作还处于被动状态。为此,开发套损防控预警系统软件,为套损预测和防治提供理论依据。本文为搞清该区块的地下动态变化与套损的关系,从地应力及方位监测,大地三维形变监测等入手,研究区块套损成因,提出控制套损速度的有效办法。确定嫩二段套损防护技术界限,并采取有针对性的防控措施,减缓套损速度。本文为监测地层动态变化对套损的影响,大庆油田在南二区西部建立了大地三维形变监测网研究套损试验区。南二区西部地层在开发过程中进行了15年的三维形变长期监测,通过监测得出了油田开发中大地三维形变的基本规律。监测结果表明:高压注采可以造成地面高程的变化,并且这种形变与同期地层压力变化趋势较为一致。断层较少的地层垂向位移量与地层压力变化的相关性较好,而在断层、断块多的地方符合程度相对较差。根据测量结果确定了防止套损的技术界限,为油田生产、套管保护提供理论指导。最后从多孔弹性理论对测量结果进行了解释,给出了开发过程中大地三维形变计算的数学模型。
[Abstract]:Casing damage in oil and water wells causes great harm to the normal production of oil fields, not only causing economic losses, but also affecting the development effect. Controlling casing damage rate has become one of the key contents of oilfield development, and the research work of casing damage mechanism in Daqing Oilfield has never stopped, and some achievements have been made. However, the mechanism study still has its limitations and independence. Most of them are qualitative research, and the scope of application of the research results is limited, so the casing protection work is still in a passive state. Therefore, the software of casing damage prevention and control early warning system is developed. In order to find out the relation between the dynamic change of underground and the casing damage, this paper studies the cause of casing damage from the monitoring of ground stress and azimuth, the monitoring of three dimensional deformation of the earth and so on, in order to find out the relationship between the dynamic change of underground and casing damage of the block. An effective method for controlling casing damage velocity is put forward. The technical limits of casing damage protection in Nen2 are determined, and corresponding measures are taken to slow down casing damage. In order to monitor the influence of dynamic change of formation on casing damage, In Daqing Oilfield, a three-dimensional deformation monitoring network has been established in the western part of South China, where the long-term monitoring of 3D deformation has been carried out for 15 years in the course of development. Through monitoring, the basic law of 3D deformation in oilfield development is obtained. The monitoring results show that high pressure injection and production can cause the change of surface elevation. And this kind of deformation is consistent with the change trend of formation pressure in the same period. The vertical displacement of formation with less fault has a better correlation with the variation of formation pressure, but in the fault, According to the measurement results, the technical limit of preventing casing damage is determined, which provides theoretical guidance for oil field production and casing protection. Finally, the measurement results are explained from the theory of porous elasticity. A mathematical model for the calculation of three-dimensional deformation of the earth during the development process is presented.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE931.2
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本文编号：1551629