Productivity prediction method for displacement development of oilfield flooding well network

Abstract

The invention relates to a productivity prediction method for displacement development of an oilfield flooding well network. The method comprises the following steps of (1) establishing a development productivity prediction model of a conventional petroleum reservoir water flooding well network; (2) introducing a displacement comprehensive coefficient, and popularizing the displacement comprehensive coefficient to various petroleum reservoir types and displacement development modes; (3) analyzing and screening relevant parameters which can reflect characteristics of the displacement development modes and have important influences on productivity results; (4) establishing a numerical model of the researched well network type and displacement development mode by use of a petroleum reservoir numerical simulation method; (5) calculating and analyzing a single factor correlation between the characteristic parameter in step (3) and the displacement comprehensive coefficient; (6) obtaining a plurality of groups of productivity results through calculation; (7) obtaining a productivity prediction model of the corresponding flooding well network displacement mode; and (8) respectively verifying the accuracy of the productivity prediction model. The method is relatively strong in universal applicability and can carry out a rapid and effective comparative analysis.

Description

technical field [0001] The invention relates to a production capacity prediction method for oil field injection-production well pattern displacement development, and belongs to the technical field of oil field production capacity prediction. Background technique [0002] As the difficulty of oilfield development increases, it is an important way to achieve stable and increased crude oil production by adopting advanced mining technologies to increase oil recovery in oilfields. Enhanced oil recovery, as the main means of enhancing oil recovery, has broad prospects in oilfield development. Over the years, new enhanced oil recovery methods have emerged and been popularized and applied. The main displacement development methods include chemical flooding, gas injection, thermal flooding and microbial flooding, etc. [0003] Because the operation process of the above-mentioned displacement development method and the oil displacement mechanism of EOR are very complex, and have the ...

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Problems solved by technology

The empirical formula method comes from statistical analysis. Most empirical formulas are only based on reservoir parameters, often without considering the specific development process, and lack sufficient theoretical analysis. Analytical methods are usually based on the theory of split flow or streamline isotonic flow. More accurate results can be obtained within a certain range of parameters, but in order to facilitate the solution, a large number of simplified assumptions are generally required, and at the same time, it has the characteristics of complex principles and inconvenient operation; numerical simulation methods can comprehensively consider the mechanisms of various oil displacement processes , but the accuracy of prediction results depends on the accuracy of reservoir characteristics and related production data, and it takes a lot of time and effort to collect and process data

[0005] The commonality of the above several existing methods is that: ① The characteristics of different injection-production well patterns are not highlighted in the productivity prediction model, and their influence on the productivity prediction results is seldom reflected; ② The actual development parameters do not directly reflect the productivity prediction results The impact caused by this is complicated in principle and weak in operability, and at the same time, it seldom reflects the characteristics of different displacement development methods; Fast and effective comparative analysis cannot be carried out between the production capacity prediction results corresponding to different methods

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