低压气井自动诱喷塞式排液系统设计与技术研究

发布时间：2018-03-04 19:01

本文选题：低压气井　切入点：分体式柱塞　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着近些年气藏开采的不断加大,很多中后期气井出现了严重的积水现象。气井井筒内积液会对地层形成一定的回压,降低气井的生产压差,使气井的产量急剧下降。长庆气田很多积水气井大都采用柱塞排水采气工艺来提高气井产量。但目前使用的柱塞排水采气装置存在关井时间长、漏失量大等问题。针对这些问题,本文设计了分体式柱塞排水采气装置,可以缩短关井时间,减少气体上窜与液体滑脱,有效提高气井的采收率。文中对低压气井自动诱喷塞式排液系统进行了总体方案设计;对系统中的核心部件分体式柱塞进行了三维结构设计,并对分体式柱塞的配件液压卡爪活动挡板捕捉器进行了三维结构设计与Ansys力学分析;在确定了分体式柱塞的具体结构后,运用动力学理论及MATLAB数值计算软件对其在井筒内的运动进行了分析计算,得到了分体式柱塞在井筒内的压力计算模型,以及在特定套压下分体式柱塞上行程的运动规律。完成了低压气井自动诱喷塞式排液系统配套设备(PLC控制器、防喷器、气动薄膜阀等)的选型。本文通过对分体式柱塞排水采气装置的动力学理论分析与大量数值计算,以及与气井试验数据对比,充分验证了低压气井自动诱喷塞式排液系统结构设计的合理性与正确性,以及整个系统排水采气功能的可实现性。采用分体式柱塞对积液气井进行排液,可以提高排液的效率,减少能源损失,降低人工成本,提高气田开发的综合效益。
[Abstract]:With the increasing development of gas reservoir in recent years, many gas wells appear serious water accumulation phenomenon in the middle and late stage. The accumulation of liquid in gas well bore will form a certain back pressure to the formation and reduce the production pressure difference of gas well. Many wells in Changqing gas field use plunger drainage gas recovery technology to increase gas well production. But the plunger drainage and gas recovery device used at present has long shutoff time. In view of these problems, a separate plunger drainage and gas recovery device is designed, which can shorten the shutoff time and reduce the gas channeling and liquid slippage. In this paper, the overall scheme design of automatic suction plug drainage system for low pressure gas wells and the three-dimensional structure design of split plunger, the core component of the system, are presented. The three-dimensional structure design and Ansys mechanical analysis of the hydraulic claw movable baffle catcher for the split-plunger fittings are also carried out, and after the concrete structure of the split plunger is determined, the concrete structure of the split plunger is determined. The dynamic theory and MATLAB numerical calculation software are used to analyze and calculate the movement of the plunger in the wellbore, and the pressure calculation model of the split plunger in the wellbore is obtained. And the movement law of the travel on the split plunger under special pressure. The PLC controller and blowout preventer are completed in the automatic suction plug drainage system of low pressure gas well. In this paper, the dynamic theory analysis and numerical calculation of the split plunger drainage and gas recovery device, and the comparison with the gas well test data are carried out. The rationality and correctness of the structure design of the automatic suction plug drainage system for low pressure gas wells and the realizability of the drainage and gas recovery function of the whole system are fully verified. Reduce energy loss, reduce labor cost, improve the comprehensive benefits of gas field development.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE37

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