Experiment evaluation method of compact sandstone gas reservoir damage by simulating gas production process

A technology of tight sandstone and evaluation methods, applied in the direction of material inspection products, instruments, analytical materials, etc., can solve the problems of not considering the process of gas production, inability to simulate the state of gas reservoirs, and failure to effectively establish, etc., to achieve low economic cost , The effect of simple operation process

Inactive Publication Date: 2018-09-07
SOUTHWEST PETROLEUM UNIV
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AI Technical Summary

Problems solved by technology

This method uses the permeability damage rate before and after the working fluid damage as an evaluation index, does not consider the actual gas production process, cannot simulate the actual production state of the gas reservoir, and fails to effectively establish the relationship between it and the gas well productivity

Method used

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  • Experiment evaluation method of compact sandstone gas reservoir damage by simulating gas production process
  • Experiment evaluation method of compact sandstone gas reservoir damage by simulating gas production process
  • Experiment evaluation method of compact sandstone gas reservoir damage by simulating gas production process

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Embodiment 1

[0028] In order to verify the reliability of the present invention, the typical tight sandstone rock sample in the Dibei block of the Tarim Basin was used as the experimental rock sample, and the reservoir protection ability of the field drilling fluid was evaluated by using the drilling fluid of the sulfonium polymer system on site. The specific operation steps are as follows:

[0029] (1) Select tight sandstone rock blocks, drill several standard core columns, and dry the rock samples at 60°C for 48 hours;

[0030] (2) The rock core column in the step (1) is packed into the rock core holder 5, a certain confining pressure is applied, the heating system 8 is turned on, the rock core holder 5 is heated to the gas layer temperature, and the temperature is kept stable;

[0031] (3) After checking the airtightness of the device, close the valve 4, open the valve 2, fill a certain amount of nitrogen into the intermediate container 3, and close the valve 2;

[0032] (4) close valv...

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Abstract

The invention discloses an experiment evaluation method of compact sandstone gas reservoir damage by simulating the gas production process. On the basis of the gas production process of a compact sandstone gas reservoir, the condition for production of reservoir gas is more really reduced. The reduction rate of productivity indexes before and after action of a working solution is taken as an evaluation index, the defect that the influence of damage to gas well productivity cannot be well evaluated through conventional indoor damage evaluation is overcome, and a bridge between indoor evaluationof compact sandstone gas reservoir damage and evaluation of a mine field is established. By means of the method, the obtained dynamic damage degrees by the working solution can be evaluated at the reduction rate of productivity indexes before and after action of the working solution at different gas production stages. With stress sensitivity, microparticle migration and other factors of the compact sandstone gas reservoir considered, the optimal flowback pressure different of the gas reservoir damaged by the working solution can be optimized. A new thought for evaluation of damage to the compact sandstone gas reservoir by the working solution is provided, and a new reference is provided for evaluation of damage to the compact sandstone gas reservoir by the working solution and optimization of protection reservoir working solution systems.

Description

technical field [0001] The invention relates to the field of tight gas reservoirs, in particular to an experimental evaluation method for tight sandstone gas layer damage. Background technique [0002] In terms of proven reserves and technical strength, tight sandstone gas reservoirs are unconventional natural gas fields with the most realistic exploration and development significance in China. Compared with conventional unconsolidated sandstone reservoirs, tight sandstone gas reservoirs generally have typical characteristics of low porosity and permeability, fine pore throats, well-developed natural fractures, abundant clay minerals, and ultra-low initial water saturation. Special reservoir geological conditions make tight oil and gas reservoirs potentially higher damage risk and more serious damage degree, and the adverse effects of reservoir damage on single well production and oil and gas reservoir recovery are also more prominent. Therefore, it is of great significance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N7/00
CPCG01N7/00G01N33/24
Inventor 游利军闫霄鹏康毅力陈杨李相臣许成元陈明君王艺钧田键邵佳新宋静晗
Owner SOUTHWEST PETROLEUM UNIV
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