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产品展厅>>项目研发>>玛南斜坡区二叠系乌尔禾组储层改造评价技术研究

本项目针对研究区低渗储层特征,开展地质和压裂建模,并结合压后排采数据及压恢测试进行分析,有效评价压裂改造效果,解决储层改造后排采压力和产量同时递减的试井解释难题。同时结合储层改造工艺适应性评价,建立适合本区的储层改造后评价方法,提高压裂后评价准确率,指导现场生产,为储量计算及产能建设提供可靠依据。

区块地质建模、低渗储层压裂渗流建模研究:

建立地质模型、低渗储层压裂渗流模型,进行精细地质描述,包括渗透率分布、地层压力分布以及裂缝规模的动态变化

基于压后排采数据分析、压恢测试分析进行综合评价方法研究:

建立低渗储层改造后排采时压力及产量数学模型

考虑均质无限大储层、压裂井、边界类型等因素,建立产量的表达式和压力导数的表达式

建立压裂后退液试产分析的试井解释图版

利用排采数据进行参数求取,与关井压力恢复测试反演求取的地层参数对比

结合地质建模、压裂建模、排采分析、压恢测试分析综合研究:

建立适用于低渗储层改造后的评价方法

研究区的岩相复杂、非均质性强,储层改造后又形成复杂的裂缝系统,压后评价必须考虑这些特点。并且压裂改造后的渗流方程非常复杂,只能采用数值模拟技术。本项目软件根据输入不同位置处的渗透率、孔隙度及地层压力等变化情况,研究渗流区域的网格划分,渗透率、孔隙度及地层压力在各网格面上的插值算法等一系列研究,以及相控建模研究。解决网格划分、偏微分方程的离散、大型稀疏矩阵预处理与求解、计算可视化及复杂地质条件的计算建模等一系列问题。通过建立压力及产量同时递减数学模型及不同地质模型下试井解释图版,解释求参。通过地质建模、压裂、排采、压力恢复测试等综合分析,实现低渗储层改造后有效评价,具有独有的技术优势。

Products>>Project Development>>Study on Permian Wuerhe formation reservoir reconstruction evaluation technology in Manan slope area

According to the characteristics of low-permeability reservoir in the study area, this project carries out geological and fracturing modeling, analyzes the production data after fracturing and pressure recovery test, effectively evaluates the fracturing effect, and solves the well test interpretation problem of simultaneous decline of drainage pressure and production after reservoir reconstruction. At the same time, combined with the adaptability evaluation of reservoir reconstruction process, the evaluation method suitable for this area is established to improve the accuracy of post fracturing evaluation, guide the field production, and provide reliable basis for reserve calculation and productivity construction.

Block geological modeling, low permeability reservoir fracturing seepage modeling research.

Geological model and fracturing seepage model of low permeability reservoir are established to describe fine geology, including permeability distribution, formation pressure distribution and dynamic change of fracture scale.

Based on the analysis of production data and pressure recovery test, the comprehensive evaluation method is studied.

The mathematical model of pressure and production after low permeability reservoir reconstruction is established.

Considering the factors of homogeneous infinite reservoir, fractured well and boundary type, the expressions of production and pressure derivative are established.

A well test interpretation chart for production test analysis of fracturing fluid is established.

The drainage data is used to calculate the parameters, and compared with the formation parameters obtained from the inversion of shut in pressure recovery test.

Combined with geological modeling, fracturing modeling, drainage analysis and pressure recovery test analysis.

The evaluation method suitable for low permeability reservoir after reconstruction is established.

The study area has complex lithofacies and strong heterogeneity, and complex fracture system is formed after reservoir transformation. These characteristics must be considered in post fracturing evaluation. And the seepage equation after fracturing is very complex, so only numerical simulation technology can be used. According to the changes of permeability, porosity and formation pressure at different input positions, the software of this project studies the grid division of seepage area, interpolation algorithm of permeability, porosity and formation pressure on each grid surface, and facies control modeling. A series of problems are solved, such as mesh generation, discretization of partial differential equations, preprocessing and solving of large sparse matrix, computational visualization and computational modeling of complex geological conditions. Through the establishment of mathematical model of simultaneous decline of pressure and production and well test interpretation chart under different geological models, the interpretation parameters can be obtained. Through the comprehensive analysis of geological modeling, fracturing, drainage and pressure recovery test, the effective evaluation of low permeability reservoir after transformation is realized, which has unique technical advantages.

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