A method and device for analyzing the development index of fracture-cavity carbonate condensate gas wells

Abstract

The present invention provides a fracture-cavity carbonate condensate gas well development index analysis method and device. The method includes: obtaining standard parameters in a single well, calculating the dynamic reserves of a single well according to the standard parameters; segmenting according to the preset natural gas production The law of decline determines the natural gas production and the cumulative production of natural gas at each production time point; determines the two-phase deviation coefficient and gas-oil ratio data according to the PVT experimental data; establishes a material balance equation, and substitutes the cumulative natural gas production and the two-phase deviation coefficient into the equation to calculate the The theoretical value of the formation pressure at the time point is corrected according to the measured static pressure data to generate a formation pressure correction value; the corresponding condensate oil production is predicted according to the formation pressure correction value and the gas-oil ratio data; Calculate the cumulative production of condensate oil; combined with the dynamic reserves of a single well, calculate the recovery degree of condensate oil and natural gas respectively.

Description

technical field [0001] The invention belongs to the technical field of condensate gas reservoir development, and in particular relates to a method and device for analyzing development indexes of fractured-cavity carbonate rock condensate gas wells. Background technique [0002] For the development of fractured-cavity carbonate condensate gas reservoirs, it has three typical characteristics: 1) The reservoir properties are complex, with different degrees of pores, caves, fractures and other storage media developed, and the reservoirs have extremely strong Heterogeneity; 2) The fluid properties are complex, and the state of oil and gas changes with the reservoir pressure; 3) The production law is complex, the production of condensate oil, natural gas production, and formation pressure decrease rapidly, and it cannot be determined according to the bottom hole flow pressure. Or the way of fixed production at the wellhead for production. Generally speaking, this type of condensa...

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Problems solved by technology

[0002] For the development of fractured-cavity carbonate condensate gas reservoirs, it has three typical characteristics: 1) The reservoir properties are complex, with different degrees of pores, caves, fractures and other storage media developed, and the reservoirs have extremely strong Heterogeneity; 2) The fluid properties are complex, and the state of oil and gas changes with the reservoir pressure; 3) The production law is complex, the production of condensate oil, natural gas production, and formation pressure decrease rapidly, and it cannot be determined according to the bottom hole flow pressure. Or wellhead fixed production method for production

Generally speaking, this type of condensate gas reservoir has strong heterogeneity, poor connectivity between wells, and limited control range of a single well. Fluid phase changes, each seepage storage unit has different production characteristics

[0003] There are relatively few studies on the development of fractured-cavity carbonate condensate gas reservoirs at home and abroad. Conventional analysis methods are not applicable to this type of gas reservoirs, and have great limitations, and the accuracy of prediction results is low.

For example, if the numerical simulation method is used to predict the development index of fracture-cavity condensate gas wells, in addition to the difficulty of geological modeling and the difficulty of providing a relatively reliable geological model, conventional seepage mathematical models are used to describe large-scale media such as large vugs, large pores, and large fractures There are still big differences in the applicability of the flow law of the internal fluid

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