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Fractured tight gas reservoir working solution damage evaluation method based on base block and cracks

An evaluation method and a technology of working fluid, applied in the direction of material inspection products, soil material testing, etc., can solve the problems of not being able to clearly measure the ratio of base blocks and cracks, and cannot be determined, and achieve simple operation, low economic cost, and simple operation process Effect

Active Publication Date: 2019-06-28
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, for fractured tight gas formations, this method cannot clearly determine the proportion of base blocks and fractures in the entire damage process, and it cannot be determined that the treatment agent added to the working fluid to reduce the damage of the working fluid is mainly aimed at rock formation. The same cracks or blocks work

Method used

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  • Fractured tight gas reservoir working solution damage evaluation method based on base block and cracks
  • Fractured tight gas reservoir working solution damage evaluation method based on base block and cracks
  • Fractured tight gas reservoir working solution damage evaluation method based on base block and cracks

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Embodiment 1

[0026] In order to verify the reliability of the present invention, a typical tight clastic rock in a certain block of the Tarim Basin was used as an experimental rock sample, and the field drilling fluid with a polysulfide system was used to evaluate the reservoir protection ability of the field drilling fluid. The specific operation steps are as follows:

[0027] (1) Select the Jurassic tight clastic rock in a block without macroscopic fractures as the experimental rock sample, drill a standard-sized full-diameter core column along the direction parallel to the bedding plane, and store the rock sample at 60 °C. Dry for 48 hours;

[0028] (2) Put the full-diameter core column in step (1) into the core holder 4, apply a certain confining pressure, turn on the heating system 5, heat the core holder 4 to the temperature of the gas layer, and maintain a stable temperature ;

[0029] (3) After checking the air tightness of the device, open valve 2, valve 8, valve 10, close valve...

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Abstract

The invention discloses a fractured tight gas reservoir working solution damage evaluation method based on base block and cracks, namely, a damage evaluation method capable of clearly determining thedamage ratio of the base block to the cracks. According to the method, a multi-scale mass transfer route in the gas production process of a fractured tight gas reservoir is simulated, the damage ratioof the base block to the cracks of a rock sample is clearly determined by analyzing the damage degree of the fractured whole-diameter rock sample and the base block after the rock sample and the baseblock are damaged by a working solution, and main and auxiliary factors of the base block and cracks in the damage process are analyzed. Besides, when a formula of the working solution of a protecting reservoir is optimized, the added reservoir protection material is more targeted by analyzing the damage ratio of the base block to the cracks of the rock sample, and a new thought can be provided for various damage evaluation experiments. The method is simple and convenient to operate, the problem of damage evaluation by the fractured tight gas reservoir working solution at present can be effectively solved, and important basis can be provided for optimization of the reservoir protection working solution of the fractured tight gas reservoir and efficient development of the gas reservoir.

Description

technical field [0001] The invention relates to the field of reservoir protection of tight gas layers, in particular to an experimental evaluation method for working fluid damage in fractured tight gas layers. Background technique [0002] In terms of proven reserves and technical strength, tight gas is the unconventional natural gas with the most practical exploration and development significance in China. Compared with conventional oil and gas reservoirs, tight gas reservoirs generally have the typical characteristics of low porosity and tightness, fine pore throats, high capillary pressure, well-developed natural fractures, abundant clay minerals, and local ultra-low initial water saturation. The gas production process in tight gas formations with natural fractures is very complicated, and there is a very high risk and degree of damage. Therefore, it is of great significance to accurately evaluate the damage mechanism and damage degree of fractured tight gas reservoirs f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 康毅力王艺钧游利军闫霄鹏李相臣谢智超陈杨
Owner SOUTHWEST PETROLEUM UNIV
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