Recovery rate calibrating method and device of tight sandstone gas field

Abstract

The invention provides a recovery rate calibrating method and device of tight sandstone gas field. The method comprises a step of dividing a target tight sandstone gas field into a plurality of work areas and dividing inner production wells into multiple well types, a step of determining a control area of each work area and a control area ratio, a well average cumulative production and a well average control area of each type of wells in each work area, a step of determining a limited number of each type of wells in each work area according to the control area of each work area and the controlarea ratio and the well average control area of each type of wells in each work area, a step of multiplying the well average cumulative production of each type of wells in each work area by the limited number of the wells to obtain a limited cumulative production of each type of wells in each work area, a step of determining a producing reserve of each type of wells in each work area and dividingthe limited cumulative production of each type of wells by the producing reserve to obtain a limited recovery rate of each type of wells in each work area, and a step of determining a final recoveryrate according to the limited recovery rate of each type of wells in each work area. According to the method and the device, the accuracy of calibrating the recovery rate of the tight sandstone gas field can be improved.

Description

technical field [0001] The present application relates to the technical field of oil and gas development, in particular to a method and device for calibrating the recovery factor of a tight sandstone gas field. Background technique [0002] The determination of gas field recovery factor and ultimate gas production volume is of great significance to guide the long-term stable production of gas fields, formulate development technical countermeasures, and measure the development effect of gas fields. The recovery rate is the ratio of the final cumulative gas production to the proven reserves when the gas field is scrapped. Proved reserves in my country refer to the geological reserves calculated after the gas field evaluation drilling stage is completed, which is the basis for development plan formulation and production capacity construction. Large-scale tight sandstone gas fields are widely distributed, have strong reservoir heterogeneity, complex geological conditions, and a...

AI Technical Summary

Problems solved by technology

There are certain problems when extended to large-scale tight sandstone gas fields: 1. Tight gas reservoirs have poor physical properties and complex pore structures, and it is difficult for the laboratory to simulate the complex pore and throat combination of reservoirs; 2. Tight gas reservoirs have low permeability , the seepage mechanism is complex, and the classic Darcy seepage theory is not applicable; 3. Large-scale tight sandstone reservoirs have strong heterogeneity, and different development blocks, or even the same development block have large internal differences, and indoor simulation analysis test sample points are relatively small. It is difficult for the recovery factor results obtained from a few rock samples to be representative of the entire gas field

Since the oil and gas reservoirs in China are mostly continental deposits, the geological conditions are quite different from those in foreign countries, and the development of tight gas reservoirs in China started late, and few tight gas reservoirs have entered the late stage of development or are close to abandonment, so the analogy method is used to calibrate the recovery factor Lack of suitable analog gas reservoirs, the accuracy is not high

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