产品展厅>>项目研发>>利用压裂压降资料及排采资料评价压裂效果

随着油气勘探向着复杂、低渗透和非常规储层领域不断延伸,采用直井分层压裂、水平井多段压裂工艺,压后返排资料越来越多,其中压裂压降及排采资料是两类最重要的资料。通过压降及排采试井渗流理论研究,开展压裂压降数据的试井分析方法研究,开展压后排采资料中压力、产量数据的试井分析方法研究,形成配套软件综合评价压裂效果。最终形成一套适应于玛湖地区的试油改造过程及改造后排采过程的试井分析技术。

压力折算中井筒垂直管流摩阻计算方法:利用压裂液注入量、粘度及流体密度等计算出雷诺数,由此判别流态进行摩阻计算。

压力分析中孔眼及近井摩阻计算方法:采用经验与理论相结合的方法进行计算。

采用四阶龙格-库特方法求解井筒中压力梯度方法:针对井筒中由能量守恒得到的微分方程,采用一维等步长网格,由四阶龙格-库特方法随网格逐一求解。

G函数压降分析方法。

采用压力及导数等双对数拟合方法分析。

地面或井底压力的平方根及半对数分析方法。

利用退液及压后压力降数据分析技术方法。

与同类产品相比,软件在以下技术方法上取得了突破和创新:

利用停泵压力降计算裂缝半长、储层渗透率的方法。

利用压裂后排采数据中的压力和产量计算裂缝半长、储层渗透率的分析方法。

建立压裂压降阶段、压后排采阶段的地面、井底压力的转换方法。

利用退液及压后压力降数据分析技术方法,采用软件工程中组建技术方法,形成在生产中应用的软件。

Products>>Project Development>>Evaluation of Fracturing Effect by Fracturing and Pressure Drop Data and Drainage Data

The trends of oil and gas exploration are about complex, low permeability and unconventional reservoir, straight well delamination fracturing, horizontal well multi-stage fracturing technology, and more after-fracturing data are adopted, among which fracturing pressure drop and drainage production are the two most important data. Through the study of seepage theory of pressure drop and drainage production test well, the well testing analysis method of pressure fracture/drop data is carried out, and the well testing analysis method of pressure and production data in after-pressure drainage and mining is also carried out, the matching software is formed to comprehensively evaluate the fracturing effect. Finally, a set of well testing analysis technology is formed, which is suitable for the transformation process and after transformation of oil test and the process of drainage and production in Mahu area.

Calculation method of flow friction in vertical pipe of wellbore in pressure conversion: Reynolds number is calculated by fracturing fluid injection volume, viscosity and fluid density, and the friction resistance is calculated by judging flow pattern.

Calculation method of friction resistance of hole and near well in pressure analysis: The method of combining experience and theory is used.

The fourth-order Runge-Kurt method is used to solve the pressure gradient method in wellbore. For the differential equation obtained by energy conservation in wellbore, one-dimensional equal step grid is used, and the fourth-order Runge-Kurt method is solved one by one with the grid.

G function pressure drop analysis method.

The double logarithmic simulation methods such as pressure and derivative are used to analyze.

Square root and semi-logarithmic analysis method of surface or bottom hole pressure.

The data analysis method of fluid withdrawal and drop after pressure is used.

Compared with similar products, the software has made breakthroughs and innovations in the following technical methods:

The method of calculating fracture half length and reservoir permeability by stopping pump pressure drop is used.

The analysis method of fracture half length and reservoir permeability is calculated by using the pressure and production data after fracturing.

The conversion method of surface and bottom hole pressure in fracturing pressure drop stage and after-pressure drainage stage is established.

The software applied in production is formed by using the data analysis technology of fluid withdrawal and pressure drop after pressure, and the technical method of constructing technology in software engineering.