Products>>Project Development>>Study on in-depth application evaluation of well test in fracture-cave reservoir

Since 2017, the technology has broken through the conventional seepage theory of sandstone  reservoir, realized the description of cave fluid characteristics through the introduction of Bernoulli equation, and established four plane and vertical geological models: well-cave-fracture, well- cave-fracture-cave, well-fracture- cave-fracture- cave, well-fracture-cave-fracture-cave. Realize the characteristic parameter interpretation of reservoir description such as the number, size, distance, fracture length and fracture cavity combination structure, and form a relatively perfect theoretical system suitable for well test interpretation of fracture cave reservoir types.

The previous research mainly focused on the theoretical research of fracture cavity well test interpretation, and the application interpretation software has not been standardized; At the same time, the physical meaning of parameters in the new theory focuses on the new parameters of fracture hole well test, and whether other parameters have new physical meaning has not been solved at present; In addition, the previous application shows that the calculation results of fracture volume are generally too large, which is only relatively sensitive to static parameters similar to fluid high-pressure physical properties. Therefore, the project continues to be carried out.

Well test interpretation and model improvement of fracture-cave  reservoir.

Sort out and improve the strata of fracture-cave reservoir, and clarify the significance of all parameters under different interpretation charts.

Application and popularization of fracture-cave well test interpretation.

Preparation of technical manual for fracture-cave well test interpretation and Application.

Updating and improving the fracture-cave well test interpretation software.

Research on fracture volume interpretation theory.

Calculation of pressure distribution in fracture-cave formation. 

Study on calculation method of average pressure drop.

This project involves the improvement of well test interpretation theory, interpretation  application and fracture volume results of fracture-cave reservoir. Through the promotion and application of more than 100 well times on site, including 50 well times of old well review in Tahe Oilfield and about 50 well times in Shunbei oilfield. At present, the coincidence rate of data interpretation is more than 70%. In the follow-up, continue to combine theory with practice, deepen the research on relevant fracture volume and dynamic reserve calculation methods, reduce the interpretation error of dynamic reserves and further  improve the coincidence rate.

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