Tight sandstone gas reservoir sensitivity experiment evaluation method

Abstract

The invention provides a tight sandstone gas reservoir sensitivity experiment evaluation method, comprising the following steps: performing first vacuumizing treatment on a core sample, and performingfirst saturation treatment on the core sample by using simulation formation water; performing first centrifugal treatment on the core sample after first saturation treatment, until the water saturation of the core sample reaches the initial water saturation of the reservoir; testing the gas measured flow rate of the core sample after first centrifugal treatment in preset displacement pressure; performing second vacuumizing treatment on the core sample, and performing second saturation treatment on the core sample by using a to-be-evaluated fluid; performing second centrifugal treatment on thecore sample after second saturation treatment, until the water saturation of the core sample reaches the initial water saturation of the reservoir; and testing the gas measured flow rate of the coresample after second centrifugal treatment in a preset displacement pressure, so as to obtain the damage degree of the to-be-evaluated fluid to the core sample. According to the method disclosed by theinvention, the core damage can be accurately evaluated.

Description

technical field [0001] The invention relates to oil and gas exploration and development technology, in particular to a tight sandstone gas reservoir sensitivity evaluation test method. Background technique [0002] With the sharp decline in the production of conventional oil and gas resources and the increasing demand for oil and gas, it is urgent to realize large-scale exploration and development of unconventional oil and gas resources with high reserves. Among them, tight sandstone gas, as a "conventional oil and gas resource" in unconventional oil and gas resources, has the characteristics of tight reservoirs, nano-micro pore throats, low initial water saturation, enrichment of sensitive minerals, and developed fractures. The current exploration and development technology of tight sandstone gas usually draws on the exploration and development technology of conventional oil and gas. However, tight sandstone gas is extremely susceptible to sensitive damage in every operati...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a tight sandstone gas reservoir sensitivity evaluation test method to solve the reservoir sensitivity evaluation method in the existing industry standards. The liquid test sensitivity damage does not conform to the seepage law of gas reservoirs, and it is difficult for liquid to seepage in tight reservoirs. , during the evaluation process, it is easy to salt out and crystallize to block the pore throat

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