【摘要】：氣井積液將會(huì)造成氣井產(chǎn)能大幅下降,需及時(shí)準(zhǔn)確預(yù)測(cè)井筒積液量,實(shí)施對(duì)應(yīng)有效排水采氣措施,保護(hù)氣井產(chǎn)能。在積液量預(yù)測(cè)研究中,以往學(xué)者主要采用氣井短期生產(chǎn)過(guò)程中油套壓下降幅度或者關(guān)井油套壓差來(lái)計(jì)算積液高度,從而得出積液量,但是針對(duì)低滲氣藏水平井長(zhǎng)期生產(chǎn)狀態(tài)下預(yù)測(cè)井筒積液量的問(wèn)題現(xiàn)有方法顯得無(wú)能為力。 針對(duì)低滲氣藏壓裂水平井在開(kāi)井生產(chǎn)狀態(tài)下無(wú)法準(zhǔn)確預(yù)測(cè)井筒積液量的問(wèn)題,首先在單相低滲透氣藏壓裂水平井井筒、裂縫、氣藏耦合流動(dòng)的理論基礎(chǔ)上,考慮氣水兩相流動(dòng),根據(jù)流體力學(xué)理論和動(dòng)量定理,結(jié)合兩相滲流理論及實(shí)際氣體狀態(tài)方程,建立新的低滲氣藏壓裂水平井氣水兩相滲管耦合模型；然后在此出發(fā),提出利用油壓作為約束,建立了由井筒持液率剖面預(yù)測(cè)井筒積液量的模型。針對(duì)不同井眼軌跡下的水平井積液預(yù)測(cè)模型,在水平型水平井積液預(yù)測(cè)模型的框架上,調(diào)整水平段井斜角,建立了上傾型、下傾型及起伏型水平井積液預(yù)測(cè)模型,同時(shí)完成了Fluent模擬研究及現(xiàn)場(chǎng)實(shí)例驗(yàn)證。 研究結(jié)果表明了該預(yù)測(cè)模型在氣井正常生產(chǎn)時(shí)就可準(zhǔn)確計(jì)算積液量,而無(wú)需關(guān)井測(cè)試；且針對(duì)長(zhǎng)時(shí)間生產(chǎn)條件下的氣井,能及時(shí)判斷其積液情況。在水平段井眼軌跡對(duì)積液影響的研究中發(fā)現(xiàn)小角度的上傾型水平井最不易積液。
[Abstract]:The gas well fluid accumulation will cause the gas well productivity to be greatly reduced. It is necessary to predict the wellbore fluid accumulation in time and accurately implement the corresponding effective drainage and gas production measures to protect the gas well productivity. In the research of fluid accumulation prediction, in the past scholars mainly used the drop range of oil casing pressure or the pressure difference of shut-in oil casing to calculate the liquid accumulation height in the short term production process of gas wells, thus obtaining the amount of fluid accumulation. However, there is no way to predict the wellbore fluid accumulation under the long-term production of horizontal wells in low permeability gas reservoirs. In order to solve the problem that it is impossible to accurately predict the wellbore fluid accumulation in a fractured horizontal well in a low permeability gas reservoir under the condition of open hole production, firstly, on the basis of the theory of coupling flow of fractured horizontal well, fracture and gas reservoir in single-phase and low permeability gas reservoir, the gas-water two-phase flow is considered. According to hydrodynamics theory and momentum theorem, combined with two-phase percolation theory and actual gas state equation, a new coupling model of gas-water two-phase seepage pipe in fractured horizontal wells in low permeability gas reservoir is established, and then the oil pressure is used as the constraint. A model for predicting wellbore fluid accumulation from wellbore liquid holdup profile is established. Aiming at the fluid accumulation prediction models of horizontal wells under different wellbore trajectory, on the frame of horizontal well fluid accumulation prediction model, the slope angle of horizontal section well is adjusted, and the updip, downdip and undulating horizontal well accumulative fluid prediction models are established. At the same time, the Fluent simulation research and field examples are completed. The results show that the prediction model can accurately calculate the amount of fluid accumulated in the normal production of gas wells without the need of well shut-down test, and can judge the accumulation of fluids in time for gas wells under the conditions of long time production. In the study of the influence of wellbore trajectory on fluid accumulation in horizontal section, it is found that small angle upward horizontal well is the most difficult to accumulate fluid.
【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)】：TE243

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