【摘要】：致密砂巖氣資源作為國內(nèi)天然氣生產(chǎn)的主力軍之一,在相當(dāng)長時(shí)期內(nèi)有望充當(dāng)非常規(guī)天然氣資源開發(fā)的“領(lǐng)頭羊”。但由于致密砂巖氣藏特殊的氣藏特征以及滲流機(jī)理,相比常規(guī)氣藏而言,儲(chǔ)量豐度小,產(chǎn)量遞減快,最終使得開發(fā)難度大,技術(shù)要求高。因此對(duì)致密砂巖氣藏特征、滲流機(jī)理以及不同井型氣井產(chǎn)能的研究變得至關(guān)重要。 本文在充分調(diào)研常規(guī)水平井產(chǎn)能、氣水同產(chǎn)井產(chǎn)能以及壓裂水平井產(chǎn)能的基礎(chǔ)上,結(jié)合致密砂巖氣藏基本特征,產(chǎn)水機(jī)理以及儲(chǔ)層流體滲流機(jī)理,考慮儲(chǔ)層以及裂縫應(yīng)力敏感、氣體滑脫效應(yīng)以及近井地帶高速非達(dá)西流效應(yīng)的影響,定義儲(chǔ)層氣體廣義擬壓力以及氣水兩相廣義擬壓力,裂縫氣體廣義擬壓力以及氣水兩相擬壓力,應(yīng)用保角變換方法以及勢(shì)的疊加原理建立了致密砂巖氣藏水平井以及壓裂水平井單相、兩相產(chǎn)能模型,并利用各向異性系數(shù)以及表皮系數(shù)對(duì)產(chǎn)能模型進(jìn)行了修正,同時(shí)考慮水平井井筒變質(zhì)量流動(dòng),將儲(chǔ)層滲流模型以及儲(chǔ)層-裂縫滲流模型與水平井井筒管流模型耦合起來,最后運(yùn)用實(shí)例數(shù)據(jù)驗(yàn)證了產(chǎn)能模型的準(zhǔn)確性,并對(duì)影響氣水同產(chǎn)水平井以及壓裂水平井產(chǎn)能的因素進(jìn)行了分析,得出了各因素對(duì)氣井產(chǎn)能影響的程度。 本文研究進(jìn)一步完善和充實(shí)了致密砂巖氣藏不同井型氣井產(chǎn)能分析理論體系,研究結(jié)果可用于致密砂巖氣藏壓裂施工參數(shù)的優(yōu)化以及氣井合理工作制度的確定,具有較高的理論價(jià)值和廣闊的應(yīng)用前景,為今后更加深入地研究致密砂巖氣藏奠定理論基礎(chǔ)。
[Abstract]:As one of the main forces of natural gas production in China, tight sandstone gas resources are expected to be the "leaders" of unconventional natural gas resources development for a long time. However, due to the special gas reservoir characteristics and percolation mechanism of tight sandstone gas reservoir, compared with conventional gas reservoirs, reserves abundance is small and production decline is fast, which ultimately makes development difficult and technical requirements high. Therefore, it is very important to study the characteristics of tight sandstone gas reservoir, percolation mechanism and productivity of different well type gas wells. On the basis of investigating the productivity of conventional horizontal wells, gas and water production wells and fracturing horizontal wells, combined with the basic characteristics of tight sandstone gas reservoir, water production mechanism and fluid percolation mechanism, the reservoir and fracture stress sensitivity are considered in this paper. The effects of gas slippage and high speed non-Darcy flow near well zone are defined to define the generalized pseudo pressure of reservoir gas, the generalized pseudo pressure of gas and water, the generalized pseudo pressure of fractured gas and the pseudo pressure of gas and water. The single-phase and two-phase productivity models of horizontal well and fracturing horizontal well in tight sandstone gas reservoir are established by means of conformal transformation method and potential superposition principle, and the productivity model is modified by anisotropy coefficient and epidermal coefficient. At the same time, considering the variable mass flow in horizontal wellbore, the reservoir percolation model and the reservoir fracture percolation model are coupled with the horizontal well wellbore pipe flow model. Finally, the accuracy of productivity model is verified by the example data. The factors influencing the productivity of horizontal wells with the same gas and water production and fracturing horizontal wells are analyzed, and the degree of influence of each factor on the productivity of gas wells is obtained. In this paper, the theoretical system of productivity analysis for different well types of gas wells in tight sandstone gas reservoirs is further improved and enriched. The results can be used to optimize the fracturing operation parameters of tight sandstone gas reservoirs and to determine the reasonable working rules of gas wells. It has high theoretical value and broad application prospect, which lays a theoretical foundation for the further study of tight sandstone gas reservoirs in the future.
【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)】：TE328

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