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产品展厅>>项目研发>>顺北一区5号断裂带提质提速钻完井技术研究-缝洞型油藏试井深入应用评价研究

该技术从2017年持续攻关至今,打破常规砂岩油藏渗流理论,通过伯努利方程的引入实现了溶洞流体特征的描述,建立井-洞-缝、井-洞-缝-洞、井-缝-洞-缝-洞、井-缝-洞-缝-洞等四种平面、纵向的地质模型,实现溶洞数量、大小、距离、裂缝长度、缝洞组合结构等储层描述的特色参数解释,形成相对完善的适用于缝洞油藏类型试井解释理论体系。

前期研究主要集中于缝洞试井解释理论攻关,对于应用解释软件尚未规范化;同时关于新理论中参数的物理意义侧重缝洞试井新参数,对于其他参数是否具有新物理意义目前尚未攻关;另外前期应用表明裂缝体积计算结果普遍偏大,仅对流体高压物性类似静态参数相对敏感,因此继续开展本项目。

缝洞型油藏试井解释及模型完善

对缝洞型油藏地层进行整理完善,明确不同解释图板下全部参数意义

缝洞试井解释应用推广

缝洞试井解释应用技术手册编制

缝洞试井解释软件更新完善

裂缝体积解释理论探究

缝洞型地层压力分布计算

平均压力降幅计算方法研究

本项目中涉及到缝洞型油藏试井解释理论完善、解释应用推广及裂缝体积结果完善。通过现场100余井次的推广应用,其中塔河油田老井复查50井次,顺北油田50余井次左右,目前资料解释符合率70%以上。后续继续将理论与实际结合,对相关裂缝体积及动态储量计算方法进行深化研究,降低动态储量解释误差,进一步提高吻合率。

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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