本文關(guān)鍵詞：低滲透斷塊油藏水動力學(xué)場特征及注水開發(fā)方式研究　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 斷塊油藏 復(fù)雜邊界 非線性滲流 保角變換 壓裂井

【摘要】：低滲透斷塊油藏不僅具有常規(guī)斷塊油藏注采井網(wǎng)不完善、邊界條件復(fù)雜、油水系統(tǒng)復(fù)雜的共同特點,同時還具有低滲透油藏的非達西滲流、油井自然產(chǎn)能低需要實施壓裂增產(chǎn)措施、地層壓力下降快需要及時注水補充地層能量的特征。因此,如何有效或高效開發(fā)低滲透斷塊油藏需要充分論證注采系統(tǒng)的有效性、注采井網(wǎng)的適應(yīng)性和完善性。 本文針對不同類型的低滲透復(fù)雜斷塊油藏,以二參數(shù)非線性滲流模型為基礎(chǔ),考慮人工裂縫和復(fù)雜邊界對滲流場特征的影響,綜合采用油藏工程、滲流力學(xué)、復(fù)變函數(shù)理論及計算機編程等多學(xué)科交叉的方法,研究了低滲透復(fù)雜斷塊油藏滲流特征,分析了不同影響因素對壓裂井產(chǎn)能的影響,并在理論研究的基礎(chǔ)上通過數(shù)值模擬技術(shù)針對不同類型的低滲透復(fù)雜斷塊油藏進行了注水開發(fā)技術(shù)的優(yōu)化研究,取得了以下研究成果： (1)以二參數(shù)非線性滲流模型為基礎(chǔ),考慮非線性滲流對油井產(chǎn)能的影響,通過matlab編程求數(shù)值解獲得了不同流度、不同產(chǎn)量和對應(yīng)壓差條件下的極限注采井距圖版；利用復(fù)變函數(shù)理論通過兩次保角變換把W平面上任意裂縫方向的生產(chǎn)井變換為W,平面上帶寬為π的排液坑道,分析了壓裂井采油直井注水一注一采滲流規(guī)律,探討了人工裂縫方向與極限注采井距和注采壓差的匹配關(guān)系； (2)利用comsol仿真模擬軟件建立了考慮復(fù)雜邊界條件下的單相穩(wěn)定滲流模型,以斷層夾角為45。的三角形低滲透斷塊油藏和定壓邊界的半圓形低滲透斷塊油藏為例,研究了復(fù)雜邊界和人工裂縫共同影響下的滲流場特征,分析了不同影響因素對斷塊可動用面積的影響；以擬穩(wěn)定試井產(chǎn)能公式為基礎(chǔ),同時考慮復(fù)雜邊界和人工裂縫的影響,分析了裂縫導(dǎo)流能力、裂縫半長、形狀因子和表皮系數(shù)對壓裂井產(chǎn)能的影響,并獲得了最優(yōu)裂縫參數(shù)； (3)通過對三角形低滲透斷塊油藏不完善井網(wǎng)條件下的數(shù)值模擬優(yōu)化研究,獲得了人工裂縫與不完善注采井網(wǎng)的最優(yōu)匹配關(guān)系和最優(yōu)注水方式；通過對條帶狀低滲透斷塊油藏不完善五點壓裂井網(wǎng)的正交優(yōu)化模擬,得到了適合于條帶狀低滲透斷塊油藏的注采模式及最優(yōu)的人工裂縫方向分布,且不同影響因素對原油采收率的影響程度為：井網(wǎng)形式人工裂縫方向人工裂縫半長； (4)針對不同邊水強度的半圓形低滲透斷塊油藏,通過對比不同井網(wǎng)形式、不同裂縫方向和不同注水方式對開發(fā)效果的影響,分析了不同影響因素對水驅(qū)面積波及效率和采收率的影響,從不同的考慮角度給出了適合于不同邊水強度條件下的注水開發(fā)方式。
[Abstract]:Low permeability fault block reservoirs not only have the common characteristics of imperfect injection-production pattern, complex boundary conditions and complex oil-water system, but also have non-Darcy percolation in low permeability reservoirs. Low natural productivity of oil wells need to implement fracturing measures to increase production, and rapid reduction of formation pressure needs timely injection to replenish the characteristics of formation energy. How to develop low permeability fault block reservoir effectively or efficiently needs to fully demonstrate the effectiveness of injection-production system and the adaptability and perfection of injection-production pattern. In this paper, for different types of low-permeability complex fault-block reservoirs, based on two-parameter nonlinear percolation model, considering the effects of artificial fractures and complex boundaries on the seepage field characteristics, reservoir engineering and percolation mechanics are adopted synthetically. The percolation characteristics of complex fault block reservoirs with low permeability are studied by using the theory of complex variable function and computer programming, and the influence of different factors on the productivity of fracturing wells is analyzed. On the basis of theoretical research, the optimization of water injection development technology for different types of complex fault block reservoirs with low permeability is studied by numerical simulation technology. The following research results are obtained: 1) on the basis of two-parameter nonlinear seepage model, considering the influence of nonlinear seepage on oil well productivity, the numerical solution of different mobility is obtained by matlab programming. The limit injection-production distance chart under the condition of different production rate and corresponding pressure difference; By using the theory of complex variable function, the production well with arbitrary fracture direction in W plane is transformed into a fluid discharge tunnel with a bandwidth of 蟺 on the plane by means of two conformal transformations, and the law of water injection, injection and production percolation in the straight well of fracturing well is analyzed. The matching relationship between the direction of artificial fracture and the interval between injection and production and the pressure difference between injection and production is discussed. 2) the single-phase steady seepage model considering complex boundary conditions is established by using comsol simulation software. Taking triangular low permeability fault block reservoir with an angle of 45. And semicircular low permeability block reservoir with constant pressure boundary as an example, the seepage field characteristics under the influence of complex boundary and artificial fracture are studied. The influence of different factors on the usable area of fault block is analyzed. Based on the quasi-stable well test productivity formula and considering the effects of complex boundaries and artificial fractures, the effects of fracture conductivity, fracture half-length, shape factor and skin factor on the productivity of fracturing wells are analyzed. The optimum fracture parameters are obtained. 3) the optimal matching relation and water injection mode of artificial fracture and imperfect injection-production well pattern are obtained through the numerical simulation and optimization research on the condition of imperfect well pattern in triangular low permeability fault block reservoir. Through the orthogonal optimization of the imperfect five-point fracturing well pattern in the strip low permeability fault block reservoir, the injection and production pattern and the optimal artificial fracture direction distribution of the strip low permeability fault block reservoir are obtained. The degree of influence of different factors on oil recovery is as follows: the artificial fracture in the pattern of well pattern is half long in the direction of artificial fracture; In view of the semicircular low permeability fault block reservoir with different edge water intensity, the effect of different well pattern, different fracture direction and different water injection mode on the development effect is compared. The influence of different factors on water flooding area sweep efficiency and oil recovery is analyzed, and the water injection development methods suitable for different edge water intensity conditions are given from different points of view.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE348

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