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裂缝性油藏稠油蒸汽注采数值模拟自适应网格法的研究
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摘要
蒸汽注采是在裂缝性稠油油藏开发中应用非常广泛且驱油效率较高的开采方法。对于裂缝性油藏稠油蒸汽注采的数值模拟,其困难在于在流场相变区域附近存在一个非常陡峭的温度和饱和度锋面。由于物理量在跨越锋面界面时变化非常剧烈,在锋面附近必须采用很小的网格尺寸才能满足精度的要求。如果对全场都采用均匀细网格,计算量将非常巨大。因此,对于这类问题非常有必要采用能够自动追踪物理量变化剧烈的锋面的自适应网格法,在物理量梯度大的位置采用细网格,而在物理量变化缓慢的区域采用较粗的网格。
     本文工作的目标是将自适应网格法应用于裂缝性油藏蒸汽注采的数值模拟。对于均匀裂缝性油藏,建议对裂缝和基质采用完全相同的自适应网格结构,这种结构下的自适应网格算法既简便又有效。数值算例的结果表明该自适应网格法相比全精细网格计算能够在保证计算精度的前提下大幅提高计算速度。同时,裂缝性油藏蒸汽辅助重力驱油(SAGD)过程算例的结果显示了在SAGD过程中由于受到裂缝渗透能力强的影响,蒸汽腔容易较早地接触油藏顶部,对蒸汽热能的利用率有着不利的影响。
     然而,在非均匀裂缝性情况下实施自适应网格法,需要面临一些复杂的数学物理问题。
     首先,本文发现,由于裂缝与基质之间的流体交换受基质渗透率大小的控制,而且相邻基质块之间的联系很微弱,因此基质渗透率在空间的急剧变化会导致相邻基质饱和度的空间不连续,直接对基质粗网格的变量进行插值或平均将带来问题的复杂性。为了解决这一问题,本文对裂缝和基质方程分别使用不同的网格系统——仅对裂缝使用自适应网格结构,而对基质使用全精细网格。由于在DP模型下不考虑基质之间的影响,本文在Newton-Raphson迭代过程中使用一种特殊的裂缝-基质方程解耦方法,将基质方程和变量完全消去,仅剩下自适应网格下的裂缝方程和变量需要参与大型稀疏矩阵的求解。此外,这一解耦方法也同样适合于DK模型,只需将相邻基质网格的变量暂时“显式化”,即在进行Newton-Raphson迭代过程中取上一迭代步的值。数值算例的结果表明,本文提出的针对非均匀裂缝性油藏的自适应网格法相比于全精细网格计算也拥有很大的计算速度优势,并且保持了较高的计算精度。数值计算效率的提高来源于对裂缝采用自适应网格结构及方程求解时采用了这一特殊的裂缝-基质变量解耦方法。
     其次,在非均匀情况下对粗网格等效渗透率的计算一直是国际上关注的难题。特别是对于多层网格结构下的等效渗透率求解方法,问题变得更加复杂。这是由于大多数等效渗透率方法蕴含有统计属性(需要粗网格包含有大量的精细网格)或者需要使用周期性边界条件。对于多层网格结构中的较细层次,它们包含的精细网格数量太少,可能不足以使这些等效渗透率算法有效。为了解决这一问题,本文建议在估算一个粗网格的等效渗透率时,不应只关注其自身所携带的有限信息,而应考虑其他区域对他的影响。于是,本文从大尺度平均理论出发,利用大尺度平均理论在全场求得“辅助变量”,它描述了压力和速度的脉动与大尺度平均的压力梯度之间的关系。利用“辅助变量”携带的信息,可以求解任意一个局部区域的等效渗透率。这一方法提供了一个恰当的方式来计算多层网格结构下粗网格的等效渗透率,而且无需对它引入任何边界条件。数值算例的结果表明这种方法相对其他常用的方法对等效渗透率的估算在多层网格下有着更好的近似。
     自适应网格法的计算速度很快,可以使人们在不同参数情况下快速进行大量的数值模拟,有利于发现油藏开采中的问题及优化开采策略。在对一维裂缝性油藏蒸汽驱过程进行大量数值实验后,发现毛管力渗吸驱油机制只在某些条件下起作用。当改变油藏参数导致进入油藏的液态水量减少时,裂缝中可能出现过热蒸汽。在这些情况下,裂缝蒸汽压力的降低导致油从基质流向裂缝。
     综上,本文的工作对在裂缝性油藏蒸汽注采数值模拟自适应网格算法及实施自适应网格法时遇到的数学物理问题开展研究。相应的数值算例显示了自适应网格算法在计算效率上相当可观的优越性。同时,还观察到了在改变参数时有趣的油藏驱替现象。本文期望自适应网格法能够对生产现场的裂缝性油藏蒸汽注采数值模拟带来实际的帮助。
Steam injection is a widely used efficient recovery technique for fractured reservoirs containing viscous oil.The difficulty for the numerical simulations of this problem is the existence of very sharp temperature and saturation fronts around the phase change regions.Due to the rapid variations of physical quantities across the fronts,very fine grids are required to satisfy the simulation accuracy.If applying uniformly fine grids to the whole domain,very huge CPU time is needed.Therefore, it's quite reasonable to consider the use of adaptive mesh refinement(AMR) technique,which is capable of using fine grids in the area with steep gradients but coarser grids where the variations of temperature and saturations are slower,to track the moving fronts inside the calculation domain.
     The object of this paper is to apply the AMR technique to the numerical simulations of steam thermal recovery processes in fractured petroleum reservoirs. For homogeneous fractured reservoirs,we suggest using the same AMR grid structures for fracture and matrix,for it is not only convenient but also effective.The numerical examples indicate the AMR technique results are both accurate and fast compared with the solutions under referenced uniformly fine grids.The numerical example for SAGD process also shows that the steam chamber could easily reach the top of the reservoir,which is harmful to the thermal efficiency of steam energy for the SAGD process in fractured reservoirs.
     However,there are several mathematical difficulties to face with under heterogeneous circumstances.
     Firstly,it's found that since the matrix-fracture mass exchange is relevant to the matrix permeability and the communications between the adjacent matrix blocks are very tiny,the spatial variations of matrix permeability will cause saturation discontinuities between the neighboring matrix blocks.Directly performing refining (downscaling) operations or coarsening(upscaling) operations upon these matrix quantities may lead to difficulties tied to the upscaling or downscaling of the exchange term.In order to avoid this problem,we suggest using two separated grid systems for the fracture and matrix equations,respectively.The AMR grid structure is applied to the fracture equation,while uniform fine-grids are maintained for the matrix equation.Under the consideration that there is no direct communication between the matrix blocks under DP model,the fracture and matrix equations can be decoupled by a special decomposition approach during the Newton-Raphson procedure for solving the nonlinear resulting equations.After that,only fracture varibles under AMR grid structures are left to participate in the large spare matrix computations.Moreover,this decomposition approach is also validated under DK model,as long as we use the variables of the neighboring matrix blocks at the last Newton-Raphson iteration step.The numerical examples show that the proposed AMR technique is fast and can give good accuracy compared to the reference fine-grid results.The improvement of the computing efficiency obtained with the proposed AMR technique comes from the use of the adaptive fracture grid as well as the special decomposition approach.
     Second,how to calculate the effective permeability of coarse grids is a difficult problem that has attracted much attention.For the equivalent permeability under multi-level grid,the situation becomes even more complicated.As most upscaling techniques have their origins in statistical physics or require the use of periodic boundary conditions,these cells in such levels may include insufficient information to satisfy the precondition of the upscaling methods.To deal with the problem,we suggest not treating the coarse cells isolately but considering the influence of the other region of the domain.We start from the large scale averaging theory whose closure variables are able to provide the description of the deviation map of the pressure and velocity of the domain.With the help of the information,we are able to obtain the equivalent of an arbitrary region inside the domain.This technique provides an appropriate way to calculate the equivalent permeability for multi-level grids,without introducing any boundary condition upon them.The numerical examples presented in this paper indicate that the proposed model may provide relatively good approximations for the equivalent permeabilities of the coarse cells of multiple nested grids
     AMR simulations are much faster than the uniformly fine-grid simulations. Therefore,it enables us to implement large amount of simulations rapidly with different parameters.It is of help to find out problems and make better decisions for pertroleum recovery.After having implemented large amount of numerical experiments upon the steam drive process for a one-dimensional fractured reservoir, we find that oil displacement in matrix is dominated by oil-water capillary pressure only under certain conditions.When conditions are changed to decrease the amount of water entering into fractured media from the boundary of the flow field,water in fracture may be vaporized to superheated steam.In these cases,the appearance of superheated steam in fracture rather than in matrix will decrease the fracture pressure and generate the pressure difference between matrix and fracture,which results in oil flowing from matrix to fracture.
     In summary,several problems relevant to the AMR numerical simulations of steam thermal recovery for fractured petroleum reservoirs are carefully stutied in this work.The numerical results indicate the considerable adavantage of AMR technique in computational efficiency.And we also observe some interesting behaviors for oil displacement in fractured reserviors.We expect the AMR technique to have a practical help to the fractured reservoir simulations in the future.
引文
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