Abstract
Successful exploitation of tight sandstone gas is one of the important means to ensure the “increasing reserves and production” of the oil and gas initiative and also one of the important ways to ensure national energy security. To further improve the accuracy of historical matching of field data such as gas production and bottom-hole pressure during the production process of this type of gas reservoir, in this study, a new expression of wellbore pressure for the uniform flow of vertical fractured wells in Laplace space based on the point sink function model of vertical fractures in tight sandstone gas reservoirs is constructed. This innovation is based on a typical production data analysis plot of the Blasingame type that uses the numerical inversion decoupling mathematical equation. After analyzing the pressure and pressure derivative characteristics of each flow stage in the typical curves, a new technique of type-curve matching was proposed. In order to verify the correctness of the model and the application value of the field, based on the previous production data of Sulige Gas Field in China, a new set of production data diagnostic chart of tight sandstone gas reservoir was formed. A case analysis showed that the application of the production data analysis method and data diagnosis plot in the field accurately evaluated the development effect of the tight sandstone gas reservoirs, clarified the scale of effective sand bodies, and provided technical support for optimizing and improving the well pattern and realizing the efficient development of gas fields.
Highlights
Tight gas is widely distributed in China, and the favorable area is 32 × 104 km2 and is primarily distributed in Ordos, Sichuan, Tarim, Songliao, and other sedimentary basins
Based on a large number of production data analyses, this study comprehensively summarizes several common problems encountered in the comparison of production data of vertical fractured gas wells in the Sulige gas field using typical curve charts (Figure 4)
The biggest difference between the production data analysis method of the vertical fractured wells in tight gas reservoirs and ordinary vertical wells is that the fracture half-length analysis is increased, and the interpretation results of this study found this increased skin factor
Summary
Tight gas is widely distributed in China, and the favorable area is 32 × 104 km and is primarily distributed in Ordos, Sichuan, Tarim, Songliao, and other sedimentary basins. The modern production decline analysis method is based on the theory of unstable flow and combines the advantages of the reservoir engineering method and the modern well test analysis to establish a new type of simulation chart It uses the daily production dynamic data to quantitatively analyze the seepage characteristics of oil and gas wells, determine reservoir parameters, and calculate well-controlled reserves. This method primarily includes the empirical method represented by the Arps method [6], the classical analysis method represented by the Fetkovich method [7], the modern double logarithmic curve fitting method represented by Blasingame et al.’s method [8], and the reservoir engineering method represented by the FMB method [9]. A set of data diagnosis plot suitable for tight sandstone gas reservoirs is formed so as to evaluate the development effect of a vertical fracture single well and a gas zone more accurately
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