Draw-down test analysis method for underground shut-in water well with low-permeability storage layer

Abstract

The invention provides a draw-down test analysis method for an underground shut-in water well with a low-permeability storage layer, and the method is applied to the technical field of oil well tests in oil fields. In the method, a base data analysis unit, a primary base feature analysis unit, a secondary main control factor analysis unit and a tertiary data analysis model unit are utilized, wherein the primary base feature analysis unit is used for utilizing the base data of the base data analysis unit to determine a geologic model for detection and analysis, judging the pressure propagation characteristic of the low-permeability storage layer and forming the superposition mode of bottomhole pressure drawdown in a drawn-down test; the secondary main control factor analysis unit is used for carrying out diagnostic analysis on the control degree of a geologic factor, a process factor and a dynamic factor on the pressure drawdown mode of the drawn-down test and determining main control factors according to the conclusion of the primary base feature analysis unit; and the tertiary data analysis model unit is used for selecting the draw-down test analysis method according to the conclusions of the primary base feature analysis unit and the secondary main control factor analysis unit and adopting different well test interpretation models according to the main control factors.

Description

technical field [0001] The invention relates to the technical field of oil well testing in oil fields, in particular to a pressure drop testing analysis method for shutting down wells in low-permeability reservoirs. Background technique [0002] Well testing is one of the most conventional reservoir dynamic monitoring technologies in the process of oilfield development at present. Theoretical research and field application take a long time and can provide a large amount of basic data for oilfield development. It is an important basis for the deployment and adjustment of oilfield development plans and is reasonable. An important guarantee for the development of oil fields. [0003] At present, the single well test mathematical model, solution method and interpretation method system of conventional medium-high permeability sandstone reservoirs have been relatively complete. In recent years, with the large-scale development of low-permeability reservoirs, well testing technolo...

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Problems solved by technology

[0008] (1) The similarity of the well test pressure curves makes it difficult to quantitatively distinguish the complexity and differences of reservoir development, seepage mechanism, oil-water relationship, wellbore-formation coupling, and the interpretation is multi-solution, lacking clear theoretical guidance and good universality Explanation method

[0009] (2) The complex low-permeability reservoirs that have been put into production in recent years have put forward higher requirements for well testing, and it is urgent to apply the results of test interpretation in depth and quantitatively to reservoir engineering analysis. At present, there is a lack of comprehensive research methods combined with reservoir engineering, and the main Therefore, it is difficult to make accurate judgments on the controlling factors, so that there is a large uncertainty in the selection of well test interpretation methods, and it is impossible to make a correct evaluation of the reservoir characteristics.

[0010] (3) The development speed of low-permeability reservoir testing technology exceeds that of well testing interpretation technology, resulting in imperfect well testing interpretation model and lack of targeted interpretation theory and interpretation technology

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