大天池气田石炭系气藏排水采气工艺研究

发布时间：2018-10-05 15:52

【摘要】：沙坪场构造位于重庆市梁平县和垫江县境内,地层水已对气藏开发产生了严重的影响,实施排水采气工艺成为大天池气田沙坪场区块石炭系气藏的主要开发方式,但气藏早已进入中后期开采,多数井能量己进入快速衰竭阶段,仅有部分井在目前开采方式下能保持能量足量的供给。如何选择最佳的排水采气措施才能使产水气井的经济效益最大,是首先需要解决的问题。本文在分析和总结大天池石炭系气藏静动态特征和开发出水机理的基础上,论证气藏治水措施工艺。由于现有开采方式不满足现场实际需求,又对常用的六种排水采气工艺进行适应性分析,并在此基础上确立了技术、经济指标体系。利用“基于模糊一致矩阵法”构建了排水采气工艺优选模型,为排水采气工艺的优选提供决策依据。通过理论研究及现场应用主要取得了以下成果和结论：该气藏水侵以裂缝性强水窜型和边水舌进为主,断层及井底裂缝是水侵主要通道,长期的大压差生产,是气井出水的主要原因。根据累计水气比可以将本气藏正在生产井分为低水气比、中水气比及高水气比三类井,筛选出了需要进行排水采气工艺的天东14、29、82、84、92井。由于各排水采气工艺方法都有各自不同的选井原则,在实际应用中,要结合产水气井的地面、地下、地理位置特殊性,综合的考虑其技术要求和经济效益,而通过分析本气藏的基础资料可知适合的排水采气工艺方法有四种：泡排、气举、优选管柱及电潜泵排水采气方法。最后充分考虑各工艺方法的经济指标(工艺成本、投资回收期、最短作业周期)及技术指标(产气量、产水量、举升效率),利用“基于模糊一致矩阵法”进行优选,能较合理的选择最适合的工艺方法,提高经济效益。
[Abstract]:Shapingchang structure is located in Liangping County and Dianjiang County of Chongqing City. Formation water has had a serious impact on gas reservoir development. The implementation of drainage gas recovery technology has become the main development mode of Carboniferous gas reservoirs in Shapingchang block of Datianchi Gas Field. However, the gas reservoir has already entered the middle and late stage of production, most of the well energy has entered the stage of rapid exhaustion, only part of the wells can maintain a sufficient supply of energy under the current production mode. How to select the best drainage and gas recovery measures to maximize the economic benefits of water and gas production wells is the first problem to be solved. On the basis of analyzing and summing up the static and dynamic characteristics of Carboniferous gas reservoirs in Datianchi and the mechanism of producing water, this paper demonstrates the water control measures of gas reservoirs. Because the existing mining methods do not meet the actual demand on the spot, the adaptability analysis of six commonly used drainage and gas production processes is carried out, and the technical and economic index system is established on this basis. Based on the fuzzy consistent matrix method, the optimal selection model of drainage gas recovery process is constructed, which provides the decision basis for the optimal selection of drainage gas recovery technology. Through theoretical research and field application, the following results and conclusions have been obtained: the water invasion of the gas reservoir is dominated by the fractured strong water channeling type and the edge water tongue entering, the fault and the bottom hole fracture are the main channel of the water invasion, and the long term large pressure difference production. It is the main reason of gas well effluent. According to the cumulative water-gas ratio, the production wells in this gas reservoir can be divided into three types: low water-gas ratio, middle water-gas ratio and high water-gas ratio. Because each drainage and gas recovery process has its own principle of well selection, in practical application, it is necessary to consider the technical requirements and economic benefits synthetically in combination with the particularity of surface, underground and geographical location of water-producing gas wells. By analyzing the basic data of this gas reservoir, we can know that there are four suitable drainage and gas production methods: bubble row, gas lift, optimal selection pipe string and electric submersible pump drainage gas production method. Finally, the economic indexes (process cost, investment payback period, shortest operation period) and technical indexes (gas production, water production, lift efficiency) of each process method are fully considered, and the "fuzzy consistent matrix method" is used to carry out the optimal selection. It can select the most suitable process method reasonably and improve the economic benefit.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE377

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