Calibration method and device for recovery factor of tight sandstone gas field

Abstract

This application provides a method and device for calibrating the recovery factor of a tight sandstone gas field. The method includes: dividing the target tight sandstone gas field into multiple work areas, and dividing the production wells in it into multiple well types; determining each work area The control area of ​​each work area, the control area ratio of various wells in each work area, the average cumulative production of wells, and the average well control area; according to the control area of ​​each work area, the control area ratio of various wells in each work area, and the average well control area , to determine the limit number of wells of each type of well in each work area; multiply the average cumulative production of each type of well in each work area by the limit number of wells to obtain the limit cumulative production of each type of well in each work area; determine each work area The producing reserves of various types of wells in each work area are divided by the limit cumulative production of various types of wells in each work area to obtain the limit recovery rate of various types of wells in each work area; The recovery factor determines the ultimate limit recovery factor. The application can improve the accuracy of recovery factor calibration of tight sandstone gas fields.

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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