Sulfur deposition reservoir damage spatio-temporal distribution characteristic prediction method

Abstract

The invention discloses a sulfur deposition reservoir damage spatio-temporal distribution characteristic prediction method, and relates to the technical field of high-sulfur-content gas reservoir development, in combination with geologic characteristics of a stratum where a to-be-predicted gas well is located, an elemental sulfur dissolution model in the stratum is constructed, and according to the precipitation pressure of elemental sulfur under the stratum condition, a prediction model is established; determining the sulfur deposition state in the stratum and the time when sulfur precipitation begins to occur; and predicting the damage degree of sulfur deposition to the stratum where the gas well to be predicted is located according to the relationship between the amount of sulfur precipitation and deposition in the stratum and the gas phase relative permeability of the stratum. The prediction method not only can predict the time of sulfur deposition of the high-sulfur-content gas well after formation pressure drop caused by exploitation, but also can predict the damage degree of sulfur deposition at different positions to the reservoir, and determines the dynamic change characteristics of the damage of different reef zone sulfur deposition reservoirs along with space and time. Scientific guidance is provided for adjustment of development policies in the sulfur deposition stage, and meanwhile technical support is provided for stable production of gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas development, in particular to a method for predicting the temporal and spatial distribution characteristics of sulfur deposition reservoir damage. Background technique [0002] During the production of gas from high-sulfur gas reservoirs, as the gas production formation pressure continues to drop, elemental sulfur will be precipitated from the sulfur-carrying gas in the form of monomers, and will be precipitated in the form of solid or liquid sulfur under appropriate temperature conditions , and deposit in the pore throat of the reservoir rock, thereby blocking the seepage channel of natural gas, reducing the effective pore space and gas phase permeability of the formation, causing serious damage to the physical properties of the reservoir, resulting in the failure of normal production. It can be seen that the prediction and evaluation of sulfur deposition is very important for t...

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Problems solved by technology

[0003] The purpose of this application is to overcome the problem of the lack of damage prediction methods for sulfur deposition reservoirs in the prior art, and provide a method for predicting the temporal and spatial distribution characteristics of sulfur deposition reservoir damage that can predict the time and degree of formation sulfur deposition

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