深層高壓低滲透油藏滲流機理研究
[Abstract]:At present, the world petroleum industry is facing severe challenges. On the one hand, the new exploration area is decreasing day by day, the reserve reserves are less and less, and the majority of the newly proved geological reserves are low permeability reservoir reserves. On the other hand, the low permeability reservoir is faced with many difficulties because of its poor development effect and economic benefit. The level of understanding and development of low permeability reservoirs is much lower than that of medium and high permeability reservoirs. It is necessary to correctly understand the characteristics and percolation mechanism of low permeability reservoirs in order to make full use of reserves of low and ultra-low permeability reservoirs and to realize high efficiency development. To solve the technical problems that restrict the utilization and efficient development of these reserves. In this paper, the deformation mechanism, start-up pressure gradient and stress sensitivity of deep high pressure and low permeability reservoirs are studied, the percolation law of low permeability reservoirs is explored, and the prediction model of variable permeability productivity is established considering the pressure-sensitive characteristics of formation. Considering fracture surface pollution, the factors affecting productivity and nonlinear phenomena of high-pressure and low-permeability reservoirs are quantitatively analyzed, the relationship between starting pressure gradient and oil well production is analyzed, and the vertical fracture group of low permeability reservoir is optimized. The optimum development and fracturing parameters of high pressure and low permeability reservoirs are studied by using numerical simulation technology, and the main measures of tapping remaining oil potential in high pressure and low permeability reservoirs are put forward. A perfect theoretical system of percolation mechanism for deep high pressure and low permeability reservoirs has been formed, which has been implemented on site in Wen13 West Block, Zhongyuan Oilfield. The water drive control reserves and water drive reserves are increased by 4.19 and 2.22 percentage points, respectively. The daily oil production increased by 15.1t, the comprehensive water cut decreased by 0.24 percentage points, and the recoverable reserves increased by 9.23 脳 104t, and good economic benefits were obtained. The research results of this paper have important guiding significance for high-efficiency development of similar reservoirs. The main achievements are as follows: 1. On the basis of studying reservoir deformation mechanism, starting pressure gradient and stress sensitivity, the percolation law and influencing factors of low permeability reservoir are explored. (2) the productivity prediction formula considering stress sensitivity and starting pressure gradient is established. 3, the influence of fracture distribution on well productivity is studied, and the factors influencing the productivity of fracturing well are analyzed. 4. Using reservoir simulation method, the optimum well pattern and fracturing matching parameters of different levels of permeability are determined. 5. The factors that affect the productivity of fracturing wells and the nonlinear phenomena of low permeability reservoirs are analyzed. The relationship between starting pressure gradient and oil well production is analyzed, and the vertical fracture group of low permeability reservoir is optimized. 6. The main measures of tapping remaining oil potential in Wendong Oilfield are put forward.
【學位授予單位】:中國地質(zhì)大學(北京)
【學位級別】:博士
【學位授予年份】:2015
【分類號】:TE31
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