非均质渗透率构型的低渗透油藏渗流特征研究
发布时间:2019-03-23 20:09
【摘要】:针对低渗透和特低渗透油藏的开发研究,一直是国内外油气田开发的重点和难点。其中低渗透油藏的非均质性对产能的影响,更是重中之重。不仅对发展低渗透油藏非均质特征渗流数学模型理论,研究低渗透油藏产能与启动压力梯度间的机理和规律,同时对推动油藏渗流理论研究的进展也具有十分重要的意义。本文首先基于非均质油藏渗透率构型的3种典型分布模式,考虑低渗透油藏启动压力梯度函数的影响,将渗透率构型引入到启动压力梯度函数表征方程,推导单相流动时的产能计算公式,建立利用生产动态资料反演渗透率构型参数的优化算法,并通过数值模拟,进行验证计算。然后,结合两相渗流的相渗曲线关系和启动压力梯度方程,推导出两相渗流时产能计算公式及优化反演构型参数方法,并通过数值算例验证。最后,在不同井网类型的条件下针对流动分区进行演算,从而形成全油藏下的数值理论计算方法。总之,本文是根据低渗透非均质油藏参数区域分布的渗流特点,结合单井——井网——全油藏的多尺度划分方法,重点研究低渗透油藏非均质构型的渗流数学特征,并且基于非均质渗透率构型,对以往的产能公式进行修正,建立一套基于非达西渗流特征的适合低渗透油藏的渗流数学模型计算方法及优化反演理论。
[Abstract]:The development of low permeability and ultra low permeability reservoirs has always been the focus and difficulty of oil and gas field development at home and abroad. The influence of heterogeneity of low permeability reservoir on productivity is the most important. It is of great significance not only to develop the mathematical model theory of heterogeneous characteristic percolation in low permeability reservoirs, but also to study the mechanism and law between productivity and start-up pressure gradient of low permeability reservoirs, as well as to promote the development of percolation theory in low permeability reservoirs. In this paper, based on three typical distribution models of permeability configuration in heterogeneous reservoir, the influence of starting pressure gradient function on low permeability reservoir is considered, and the permeability configuration is introduced into the characterization equation of starting pressure gradient function. The productivity calculation formula for single-phase flow is derived, and the optimization algorithm for inversion of permeability configuration parameters by using production dynamic data is established, and the numerical simulation is carried out to verify the calculation. Then, based on the relationship between the two-phase seepage curve and the starting pressure gradient equation, the productivity calculation formula and the optimization inversion configuration parameter method are derived, and verified by numerical examples. Finally, under the conditions of different well patterns, the flow zone is calculated to form a numerical calculation method for the whole reservoir. In a word, according to the seepage characteristics of the regional distribution of the parameters of low permeability heterogeneous reservoirs, combined with the multi-scale division method of single well-well pattern-whole reservoir, this paper focuses on the mathematical characteristics of the heterogeneity configuration of low permeability reservoirs. Based on the heterogeneous permeability configuration, the previous productivity formula is modified, and a set of mathematical model calculation methods and optimal inversion theory for low permeability reservoirs based on the characteristics of non-Darcy seepage flow are established.
【学位授予单位】:东北石油大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TE312
,
本文编号:2446186
[Abstract]:The development of low permeability and ultra low permeability reservoirs has always been the focus and difficulty of oil and gas field development at home and abroad. The influence of heterogeneity of low permeability reservoir on productivity is the most important. It is of great significance not only to develop the mathematical model theory of heterogeneous characteristic percolation in low permeability reservoirs, but also to study the mechanism and law between productivity and start-up pressure gradient of low permeability reservoirs, as well as to promote the development of percolation theory in low permeability reservoirs. In this paper, based on three typical distribution models of permeability configuration in heterogeneous reservoir, the influence of starting pressure gradient function on low permeability reservoir is considered, and the permeability configuration is introduced into the characterization equation of starting pressure gradient function. The productivity calculation formula for single-phase flow is derived, and the optimization algorithm for inversion of permeability configuration parameters by using production dynamic data is established, and the numerical simulation is carried out to verify the calculation. Then, based on the relationship between the two-phase seepage curve and the starting pressure gradient equation, the productivity calculation formula and the optimization inversion configuration parameter method are derived, and verified by numerical examples. Finally, under the conditions of different well patterns, the flow zone is calculated to form a numerical calculation method for the whole reservoir. In a word, according to the seepage characteristics of the regional distribution of the parameters of low permeability heterogeneous reservoirs, combined with the multi-scale division method of single well-well pattern-whole reservoir, this paper focuses on the mathematical characteristics of the heterogeneity configuration of low permeability reservoirs. Based on the heterogeneous permeability configuration, the previous productivity formula is modified, and a set of mathematical model calculation methods and optimal inversion theory for low permeability reservoirs based on the characteristics of non-Darcy seepage flow are established.
【学位授予单位】:东北石油大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TE312
,
本文编号:2446186
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