Rapid productivity prediction method for multilayer commingled production of tight sandstone gas reservoir

Abstract

The invention discloses a rapid productivity prediction method for multilayer commingled production of a tight sandstone gas reservoir. The rapid productivity prediction method comprises the followingsteps of: 1) acquiring static parameters of each single-layer reservoir of the tight sandstone gas reservoir; 2) establishing a single-layer productivity prediction model according to the static parameters of each single-layer reservoir and single-layer gas testing data; 3) and establishing a multilayer commingled production gas well productivity prediction model according to the single-layer productivity prediction model, gas field multilayer commingled production gas well productivity pilot production data, and a relation curve between gas well multilayer commingled production test productivity in the gas field multilayer commingled production gas well productivity pilot production data and the sum of non-blocking flow of each small layer of a gas well obtained by the single-layer productivity prediction model, so that the commingled production productivity of the multilayer tight sandstone gas reservoir is rapidly predicted.

Description

technical field [0001] The invention belongs to the technical field of gas field development, and specifically relates to a rapid productivity prediction method for tight sandstone gas reservoirs in multi-layer combined production. Interpret parameters to enable rapid forecasting of production capacity. Background technique [0002] As my country promotes the development of clean energy, the demand for natural gas is increasing year by year. Among them, tight sandstone gas reservoirs are an important force in the supply of natural gas and will continue to be a bright spot in the growth of reserves and production. In recent years, most of the gas reservoirs discovered in the Ordos Basin and even in western my country are tight sandstone gas reservoirs, and some tight sandstone gas reservoirs have multiple thin gas-bearing layers, no prominent longitudinal dominant layers, strong heterogeneity, single-layer reservoirs and Due to the poor seepage capacity and other characterist...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome above-mentioned deficiencies in the prior art, provide a kind of rapid production capacity prediction method of multi-layer co-production tight sandstone gas reservoir, overcome 1 in the prior art: single-layer gas well productivity evaluation method is relatively mature, for multi-layer There are few studies on the productivity of co-production gas wells; 2: At present, the establishment of multi-layer gas reservoir seepage theory and productivity evaluation method requires many input parameters, and the calculation process is complicated and cumbersome, which cannot meet the needs of rapid evaluation of mines; 3: Each layer of multi-layer gas reservoirs There are differences in physical properties, and the interlayer relationship is complex. Under the multi-layer combined mining method, interlayer heterogeneity is seriously affected, and the dynamic characteristics of gas wells are complicated. It is difficult to evaluate the production capacity of co-production; 4: Time-consuming single-point gas test test, high test cost, large deviation in estimation by mine experience method, directly affect the development benefits of gas fields, etc.

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