四川梓潼区块页岩气井井控技术研究

发布时间：2018-12-09 14:05

【摘要】：页岩气是一种清洁、高效的能源资源,页岩气藏属于致密的非常规气藏。国外在页岩气钻采上取得了较好成绩。我国的页岩气资源丰富,开发利用页岩气资源具有广阔的前景。目前在四川地区已经进行了页岩气勘探,在开采过程中,由于存在高压气藏,井控技术属于核心技术,显得尤为重要。要做好井控工作,首要任务即是通过各种方法平衡井底压力,本文将对影响井底平衡的各种因素进行论述,包括井底压力、循环压耗、气体上窜速度等,找出各种工况下相应的重要参数,控制好这些因素才能做好一次井控,保证井下压力平衡,维持井下正常生产。以此为基础讨论在气侵过程中,各种压力参数的特殊变化情况,特别是井底压力的变化。然后再对不同的压井方法进行论述,分析各种常规、非常规压井方法的适用性,比较确定适合梓潼区块的压井方法,重新使井底恢复到压力平衡状态。此外,考虑到梓潼区块可能出现喷漏同时出现的情况,本文还将讨论确认漏点位置的方法,并进行防漏堵漏,为防喷工作做好前期工作。最后根据在梓潼区块实施的实际案例,说明该地区的井下复杂性,选择使用适合的井控装备,以及当发生漏喷同时存在时所采取的实际措施,最终将复杂情况解除,使井恢复正常生产。总结出比较适合该区块的井控方案,为该区块后续的施工作业提供参考依据。
[Abstract]:Shale gas is a clean and efficient energy resource. Shale gas reservoir belongs to dense unconventional gas reservoir. Good results have been achieved in shale gas drilling and production abroad. China is rich in shale gas resources, and the exploitation and utilization of shale gas resources have broad prospects. Shale gas exploration has been carried out in Sichuan area at present. Due to the existence of high pressure gas reservoir, well control technology is very important. In order to do well the well control work, the first task is to balance the bottom hole pressure through various methods. This paper will discuss various factors that affect the bottom hole balance, including bottom hole pressure, circulation pressure consumption, gas channeling velocity, etc. Find out the corresponding important parameters under various working conditions, control these factors well once, ensure the pressure balance and maintain the normal production. On this basis, the special variation of various pressure parameters, especially the change of bottom hole pressure, in the process of gas invasion is discussed. Then different well killing methods are discussed, the applicability of various conventional and unconventional well killing methods is analyzed, the well killing methods suitable for Zitong block are compared, and the bottom hole pressure equilibrium state is restored again. In addition, considering the possible simultaneous occurrence of spillage and leakage in Zitong block, this paper will also discuss the method of confirming the location of leak point, and carry out leakage prevention and plugging, so as to do a good job in the early stage of the prevention of blowout. Finally, according to the actual cases implemented in Zitong block, this paper explains the complexity of the downhole in this area, chooses to use suitable well control equipment, and the practical measures taken when leakage and blowout exist at the same time, finally relieves the complex situation. Restore the well to normal production. The well control scheme suitable for the block is summarized, which provides a reference for the subsequent construction of the block.
【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】：TE28

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