本文選題：致密氣藏 + 壓敏效應(yīng)��； 參考：《中國(guó)石油大學(xué)(華東)》2015年碩士論文

【摘要】：致密氣藏的產(chǎn)能預(yù)測(cè)對(duì)氣藏開(kāi)發(fā)方案設(shè)計(jì)和氣田合理配產(chǎn)都具有十分重要的意義。物模實(shí)驗(yàn)表明,致密低滲透氣藏存在壓敏效應(yīng)和啟動(dòng)壓力梯度等滲流特征,達(dá)西定律不再適用,同時(shí),致密凝析氣藏還存在著凝析現(xiàn)象。本文主要研究工作包括以下幾個(gè)方面,首先,利用物模實(shí)驗(yàn)推出壓敏效應(yīng)和啟動(dòng)壓力梯度的經(jīng)驗(yàn)公式,并利用邊界壓力梯度極限法推導(dǎo)了考慮啟動(dòng)壓力梯度和壓敏效應(yīng)的氣井泄氣半徑計(jì)算公式。其次,利用保角變換的方法,推導(dǎo)了考慮壓敏效應(yīng)和啟動(dòng)壓力梯度的氣藏壓裂直井和壓裂水平井穩(wěn)態(tài)產(chǎn)能解析計(jì)算公式,為了便于比較壓裂效果也推導(dǎo)了未壓裂時(shí)的產(chǎn)能方程。然后,嘗試用一種較為簡(jiǎn)便的方法進(jìn)行凝析氣藏產(chǎn)能的計(jì)算。最后,進(jìn)行敏感性分析。通過(guò)分析,可以看出壓敏效應(yīng)和啟動(dòng)壓力的存在會(huì)降低氣井產(chǎn)量,但是壓敏效應(yīng)對(duì)產(chǎn)能的影響更敏感,在高生產(chǎn)壓差時(shí)尤為明顯;對(duì)于壓裂水平井,水平段長(zhǎng)度越長(zhǎng)、壓裂縫條數(shù)越多、裂縫越長(zhǎng),產(chǎn)量越高,但隨著這些因素的增加,產(chǎn)量的增幅越來(lái)越小,兩端密集中間稀疏的裂縫位置分布,有利于產(chǎn)量的提高;地露壓差越小,凝析油析出的越迅速,阻礙氣的滲流,減低氣井產(chǎn)能。
[Abstract]:The productivity prediction of tight gas reservoir is of great significance to the design of gas reservoir development plan and the reasonable distribution of gas field. Physical model experiments show that there are percolation characteristics such as pressure-sensitive effect and starting pressure gradient in dense and low permeability gas reservoirs, Darcy's law is no longer applicable, and condensate phenomenon exists in dense condensate gas reservoirs. The main work of this paper includes the following aspects: firstly, the empirical formulas of pressure sensitivity effect and starting pressure gradient are derived by physical model experiment. The calculation formula of gas well leakage radius considering starting pressure gradient and pressure-sensitive effect is derived by using the boundary pressure gradient limit method. Secondly, using the conformal transformation method, the analytical formulas for calculating the steady-state productivity of gas reservoir fracturing straight wells and fracturing horizontal wells considering the pressure sensitivity effect and the starting pressure gradient are derived. In order to compare the fracturing effect, the productivity equations without fracturing are derived. Then, a simple method is used to calculate the productivity of condensate gas reservoir. Finally, sensitivity analysis is carried out. Through analysis, we can see that the existence of pressure-sensitive effect and start-up pressure will reduce the gas well output, but the pressure-sensitive effect is more sensitive to the productivity, especially when the production pressure difference is high, and the longer the horizontal section length is, the longer the horizontal section length is. With the increase of these factors, the increase of yield becomes smaller and smaller, and the distribution of the cracks between the two ends is dense and sparse, which is beneficial to the increase of yield, and the difference of ground pressure is smaller. The faster the condensate is released, the more obstructed the gas percolation and the lower the gas well productivity.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE328;TE372

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