The Chengong numerical well testing software includes water, polymer and chemical driving, dense oil and gas, shale gas and other modules. The numerical well testing provides an analytical tool for the complex boundary, the anisotropic reservoir and the multi-phase fluid and other pressure data without analytical solution. The numerical well testing not only realizes the interpretation of the formation parameters, but also provides the static parameter distribution such as formation permeability and porosity, and the distribution of the formation pressure, saturation and other field data in different time, it is an important tool for fine description of formation.

The software adopts a non-structure PEBI grid, a black oil model is adopted for water flooding, a component model is adopted for the chemical flooding and polymer flooding, a control volume method is used to disperse, the black oil model can provide single-phase, two-phase and three-phase oil-gas water flowing simulation work, The complex cases such as bubble point, inter-formation heterogeneity, formation crossflow and so on are also considered; The software has the function of loading geological body data, supporting the function of geological coordinates and phase controlled modelling. The main technologies are as follows:

Grid intelligent division technology: On different blocks of oil reservoir simulation area, different grid and coordinate system are used by combining fluid flow characteristics. Rectangular, hexagonal and variable scale unstructured PEBI grids are provided by software. Intelligent grid uses different streamlines in different well patterns to optimize the number of grids to reduce the number of grids under the condition of ensuring the accuracy of the solution.

Matrix pre-processing technology: Algebra multigrid and GMRES are used to pre-process and solve the matrix, and the calculation speed is improved on the premise of ensuring the accuracy of the solution.

Calculation of over bubble point of gas bearing phase: With the decrease or increase of pressure, gas spills from oil or dissolves into oil, which brings the complexity of calculation, thus, the pressure and saturation of the bubble point grid are modified.

Visualization of calculation: The calculation results are displayed intuitively in the form of two-dimensional and three-dimensional graphics.