DST slug flow refers to the continuous flow of liquid from formation to wellbore during oil well exploitation (or production), and the fluid in wellbore has not yet reached the surface. DST slug flow exists in a large number of low permeability reservoirs in China, but no corresponding well testing interpretation method has been put forward abroad.

Applying interpretation analysis method of known flowrate to do well testing analysis can not get accurate interpretation results, so the software first establishes the equation of formation and wellbore coupling flow (see Figure 1), determines the relationship between flow rate and bottom hole pressure, and then puts forward a joint well testing analysis method of flow and recovery, which solves the problem of pressure data interpretation of DST slug flow, and the related technologies have been widely used in exploration well testing in China.

DST data module: Realizing DST flow and pressure recovery data import, data processing, data management and data storage.

Chart calculation module: Including seepage model, geological model, wellbore condition and reservoir boundary model and etc., the DST well testing analysis chart is constructed according to the combination method.

DST well testing analysis module: Provides the production conversion module during DST slug flow; DST flow and pressure recovery combination analysis; flow subdivision pressure and derivative simulation analysis.

Report output module: Input data, interpretation results, all kinds of graphics, tables and so on are output in user-defined reporting mode.

Interface module: According to menu, tool bar and dialog box, each module of DST well testing is connected to complete the well testing interpretation of DST test.