發(fā)布時間：2018-04-18 16:04

  本文選題：雙層油藏 + 部分射開　； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：油氣田開采技術(shù)和鉆井技術(shù)的逐漸進步,使我們發(fā)現(xiàn)了各種各樣類型的油氣藏。對于我們已經(jīng)發(fā)現(xiàn)的不同類型的油氣藏,包括海上油氣田、嚴(yán)重水錐和氣頂?shù)挠蜌獠�、各向異性因子很大的油氣藏、低滲透油氣藏、高含水高采出的老油田等,直井開采方案受很多因素限制,開采效果不好,所以導(dǎo)致斜井、定向井以及部分射開井的應(yīng)用越來越多。采用斜直井的鉆井方法開發(fā)特殊類型油氣藏,這樣的油田現(xiàn)場實際例子很多。一方面是由于油氣滲流的滲流面積可以通過鉆遇斜直井的方式,大大地得到增加,從而來提高油氣田產(chǎn)量;另一方面是因為我們發(fā)現(xiàn)了很多不同地質(zhì)條件和埋存條件下的不同油藏,這些油藏厚度、滲透率等滲流物性條件不盡相同。由于單層油藏空間小圓匯解比點源解更貼近于生產(chǎn)實際,本文聯(lián)合采取Laplace變換和Fourier有限余弦積分變換,在Laplace變換域中求得不穩(wěn)態(tài)滲流過程中小圓匯壓力分布,再通過stehfest數(shù)值反演方法,求得時空間單層油藏小圓匯壓力解。得到的解可以為論文后續(xù)推演涉及到的部分射開直井和斜井直線分布匯等問題提供一個解析求解的理論基礎(chǔ)。在單層空間小圓匯解的基礎(chǔ)上,通過推導(dǎo),建立了無限延伸單層油藏部分射開直井的滲流數(shù)學(xué)模型,利用Laplace和傅里葉變換,求得單層油藏壓力解和產(chǎn)量,并與Bilhartz曾經(jīng)給出的有限差分計算的數(shù)值模擬結(jié)果,進行了井壁壓力的實例驗證。在無限延伸單層油藏解析解的基礎(chǔ)上,建立無限延伸雙層油藏部分射開井模型,求解和計算了無限延伸邊界雙層油藏部分射開直井無量綱壓力和產(chǎn)量,并選取商業(yè)軟件Intepreter中部分射開直井的不穩(wěn)定試井實例數(shù)據(jù)并對計算結(jié)果進行了驗證。接著計算了圓形封閉邊界下雙層油藏部分射開直井的壓力和產(chǎn)量,并通過積分平均解決參考點問題,加快了計算速度。接著進行了產(chǎn)量遞減分析和晚期擬穩(wěn)態(tài)滲流特征的分析。最后,在單層油藏部分射開直井圓匯解的基礎(chǔ)上,沿斜直線積分,得到帶有角度的單層油藏部分射開斜井壓力解。并對井斜角、局部射開程度、井斜長和不同油藏厚度對單層油藏部分射開斜井井壁壓力的影響進行了分析。
[Abstract]:With the development of oil and gas production technology and drilling technology, various types of oil and gas reservoirs have been discovered.For the different types of oil and gas reservoirs we have discovered, including offshore oil and gas fields, severe water cone and gas cap reservoirs, oil and gas reservoirs with high anisotropy factors, low permeability reservoirs, old oil fields with high water cut and high recovery, etc.Due to the limitation of many factors and the poor production effect, the application of inclined well, directional well and partial shot well is more and more.There are many practical examples in the field of developing a special type of oil and gas reservoir by using the drilling method of inclined straight well.On the one hand, the percolation area of oil and gas percolation can be greatly increased by drilling and meeting oblique vertical wells, thus increasing the oil and gas field production.On the other hand, we have found many different reservoirs under different geological conditions and buried conditions, which have different percolation properties such as thickness and permeability.Because the small circle solution in single layer reservoir is closer to the production practice than the point source solution, the pressure distribution of small circle sink in the Laplace transform domain is obtained by using Laplace transform and Fourier finite cosine integral transform.Then the pressure solution of small circle in time space single layer reservoir is obtained by stehfest numerical inversion method.The obtained solution can provide a theoretical basis for the analytical solution to the problems of linear distribution of vertical and inclined wells which are involved in the subsequent derivation of the paper.On the basis of the small circular solution in single layer space, the mathematical model of percolation of infinite extended single layer reservoir with partial shooting straight well is established. The pressure solution and output of single layer reservoir are obtained by Laplace and Fourier transform.With the numerical simulation results of finite difference calculation given by Bilhartz, an example is given to verify the wellbore pressure.Based on the analytical solution of infinite extension single layer reservoir, a partial perforating well model of infinite extended double layer reservoir is established, and the dimensionless pressure and production rate of partial shooting straight well in infinite extended boundary bilayer reservoir are solved and calculated.The unsteady well test data of partially shot straight well in commercial software Intepreter are selected and the calculation results are verified.Then the pressure and production rate of the double layer reservoir with circular closed boundary are calculated, and the problem of reference point is solved by integral average, which accelerates the calculation speed.Then the production decline analysis and the analysis of the late quasi-steady seepage characteristics are carried out.Finally, on the basis of the circular confluence solution of the single layer reservoir, the pressure solution of the single layer reservoir with angle is obtained by integrating along the oblique straight line.The effects of inclined angle, local shooting degree, well slant length and different reservoir thickness on the wall pressure of partial shooting inclined well in single-layer reservoir are analyzed.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE24

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本文編號：1769072