Method for quantitatively forecasting analog development indexes of oil and gas fields

Abstract

The invention relates to a method for quantitatively forecasting analog development indexes of oil and gas fields. The method comprises the following steps that 1), an oil pool three-dimensional seepage mathematic model is built according to a motion equation, a matter balance equation, a saturability auxiliary equation, initial conditions and boundary conditions of an oil pool; 2), nondimensionalization is carried out on the oil pool three-dimensional seepage mathematic model to obtain the nondimensionalization mode of the oil pool three-dimensional seepage mathematic model; 3), the oil pool three-dimensional seepage similarity criterions are obtained according to the equation structure and similarity theory analysis of the nondimensionalization mode of the oil pool three-dimensional seepage mathematic model and are simplified into pi I and pi II; 4), whether the oil and gas fields to be developed and the developed oil and gas fields meet the similarity criterions pi I and pi II or not is judged; 5), for the oil and gas fields meet the similarity criterions pi I and pi II, to-be-developed productivity Q and to-be-developed recovery efficiency R of the developed oil and gas fields are forecasted according to developed productivity Q and developed recovery efficiency R of the developed oil and gas fields by using a forecast formula; 6), the quantitative forecast result of to-be-developed productivity Q and to-be-developed recovery efficiency R of the oil and gas fields to be developed in the development indexes can be obtained through calculation.

Description

technical field [0001] The invention relates to a method for quantitatively predicting indexes, in particular to a method for quantitatively predicting indexes for analogous development of oil and gas fields. Background technique [0002] The field of oil and gas field development is characterized by high investment and high risk. In order to avoid investment risks, before the newly discovered oil and gas fields are put into production, people try to accurately predict their development indicators such as production capacity and recovery rate. Commonly used development index forecasting methods include: 1. Theoretical formula method. People use a large number of conceptual models and theoretical means, but these conceptual models and theoretical means are mostly based on various ideal assumptions. Therefore, the theoretical formula method can only deal with relatively Simple and conventional oil and gas fields, but for special oil and gas fields, its applicability is not hi...

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Problems solved by technology

Commonly used development index forecasting methods include: 1. Theoretical formula method. People use a large number of conceptual models and theoretical means, but these conceptual models and theoretical means are mostly based on various ideal assumptions. Therefore, the theoretical formula method can only deal with relatively Simple and conventional oil and gas fields, but for special oil and gas fields, its applicability is not high

2. The empirical formula method has certain reference value and can be used as a reference. However, for special oil and gas fields, on the one hand, the calculation parameters in the empirical formula often cross the boundary, which makes the empirical formula inapplicable; on the other hand, these empirical formulas are mostly based on The actual oil and gas fields have many years of development experience and development data, while the development time of special oil and gas fields is relatively late, and there are few cases, and there is currently a lack of a large number of reference data

3. Numerical simulation method, a large number of parameters in the digital simulation software need to be input manually, which is highly subjective, and the research period is long and the efficiency is low, and the numerical simulation method itself continues various idealizations in the theoretical mathematical model. suppose

However, in the oil and gas field analogy methods in the prior art, an effective method for quantitatively predicting the development indicators of the oil and gas fields to be developed has not been found, so that the oil and gas field analogy method does not have engineering application value

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