产品展厅>>项目研发>>三元复合驱(聚合物驱)数值模型建立及求解方法研究

数值试井要模拟的是短时瞬态压力,解决的是目前地层压力评价、地层流体参数分布等问题,因而在网格划分、时间步长、计算稳定性等方面要求更高,不能完全采用油藏数值模拟技术,本项目研究适合数值试井的非结构网格划分技术、离散及线性方程组求解技术及可视化技术。另外,对于化学驱采油,当注入的流体导致地层中混合流体的粘度增加,可能会出现宾汉(Bingham)流体渗流。对于泡沫流、大分子或细颗粒形成的松散聚集物渗流时,容易导致幂律流体渗流。为了更加精确的描述化学驱的物化现象,获得符合油藏实际的地质动态数据,本项目研究基于宾汉流体的试井解释方法。

建立适合数值试井的非结构网格划分方法并程序化,可以描述复杂油藏边界、断层及复杂井型等信息,满足瞬态压力求解及试井分析需要。

建立考虑三元复合驱渗流偏微分的离散及大型稀疏矩阵线性方程组求解方法并程序化。

实现输入参数及解释参数可视化(输入参数包括孔隙度、渗透率、有效厚度等,解释参数包括地层压力、油(水)饱和度、地层流体粘度、聚合物浓度等),提供输入数据的分布图,提供输出参数的随时间、空间变化的三维视图。

建立基于幂律流体及宾汉流体解析方法研究并程序化,满足简单情形下的试井解释要求。

在国内首次将化学与流体耦合,解决化学驱试井分析问题;采用实验数据解决了化学驱流体渗流剪切变稀;采用组分模型解决化学驱中的离子问题。在国际上首次考虑幂律流体及宾汉流体的化学驱解析试井分析方法,满足了试井分析软件的现场应用问题。

Products>>Project Development>>Study on Establishment and Solution of Numerical Model of ASP Flooding (Polymer Flooding)

Numerical well testing simulates short-time transient pressure, solve the current formation pressure evaluation, formation fluid parameter distribution and other problems, so it is more demanding in grid division, time step size, computational stability and so on. Reservoir numerical simulation technology can not be completely adopted. This project studies the unstructured grid division technology, discrete and linear equations solving technology and visualization technology suitable for numerical well testing. In addition, for chemical flooding, when the injected fluid increases the viscosity of the mixed fluid in the formation, Bingham (Bingham) fluid seepage may occur. For foam flow, the seepage of loose aggregates formed by macromolecules or fine particles is easy to lead to power-law fluid seepage. In order to describe more accurate of the physical and chemical phenomena of chemical flooding and obtain the geological dynamic data in accordance with the actual reservoir, the well testing interpretation method based on Bingham fluid is studied in this project.

The unstructured grid division method suitable for numerical well testing is established and programmed, which can describe the boundary, fault of complex reservoir and complex well type, and meet the needs of transient pressure solution and well testing analysis.

A method for solving discrete and large sparse matrix linear equations considering partial differential seepage in ASP flooding is established and programmed.

The visualization of input parameters and interpretation parameters (input parameters including porosity, permeability, and effective thickness and so on, interpretation parameters including formation pressure, oil (water) saturation, formation fluid viscosity, polymer concentration, etc.) is realized, the distribution map of input data is provided, and the three-dimensional view of output parameters with time and space is provided.

The analytical method based on power law fluid and Bingham fluid is established and programmed to meet the requirements of well testing interpretation in simple case.

The chemical and fluid coupling is first introduced in China to solve the problem of chemical drive test well analysis. The experimental data is used to solve the problem of chemical flooding fluid seepage and shear thinning, and the ion problem in the chemical flooding is solved by the group model. In the world, power law fluid and the chemical flooding analysis well testing analysis method of Bingham fluid are considered for the first time, and the field application problem of well testing analysis software is solved.