【摘要】：沙坪場構(gòu)造位于重慶市梁平縣和墊江縣境內(nèi),地層水已對氣藏開發(fā)產(chǎn)生了嚴(yán)重的影響,實(shí)施排水采氣工藝成為大天池氣田沙坪場區(qū)塊石炭系氣藏的主要開發(fā)方式,但氣藏早已進(jìn)入中后期開采,多數(shù)井能量己進(jìn)入快速衰竭階段,僅有部分井在目前開采方式下能保持能量足量的供給。如何選擇最佳的排水采氣措施才能使產(chǎn)水氣井的經(jīng)濟(jì)效益最大,是首先需要解決的問題。本文在分析和總結(jié)大天池石炭系氣藏靜動(dòng)態(tài)特征和開發(fā)出水機(jī)理的基礎(chǔ)上,論證氣藏治水措施工藝。由于現(xiàn)有開采方式不滿足現(xiàn)場實(shí)際需求,又對常用的六種排水采氣工藝進(jìn)行適應(yīng)性分析,并在此基礎(chǔ)上確立了技術(shù)、經(jīng)濟(jì)指標(biāo)體系。利用“基于模糊一致矩陣法”構(gòu)建了排水采氣工藝優(yōu)選模型,為排水采氣工藝的優(yōu)選提供決策依據(jù)。通過理論研究及現(xiàn)場應(yīng)用主要取得了以下成果和結(jié)論：該氣藏水侵以裂縫性強(qiáng)水竄型和邊水舌進(jìn)為主,斷層及井底裂縫是水侵主要通道,長期的大壓差生產(chǎn),是氣井出水的主要原因。根據(jù)累計(jì)水氣比可以將本氣藏正在生產(chǎn)井分為低水氣比、中水氣比及高水氣比三類井,篩選出了需要進(jìn)行排水采氣工藝的天東14、29、82、84、92井。由于各排水采氣工藝方法都有各自不同的選井原則,在實(shí)際應(yīng)用中,要結(jié)合產(chǎn)水氣井的地面、地下、地理位置特殊性,綜合的考慮其技術(shù)要求和經(jīng)濟(jì)效益,而通過分析本氣藏的基礎(chǔ)資料可知適合的排水采氣工藝方法有四種：泡排、氣舉、優(yōu)選管柱及電潛泵排水采氣方法。最后充分考慮各工藝方法的經(jīng)濟(jì)指標(biāo)(工藝成本、投資回收期、最短作業(yè)周期)及技術(shù)指標(biāo)(產(chǎn)氣量、產(chǎn)水量、舉升效率),利用“基于模糊一致矩陣法”進(jìn)行優(yōu)選,能較合理的選擇最適合的工藝方法,提高經(jīng)濟(jì)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.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE377

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