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A damage evaluation method for working fluid in fractured tight gas formations taking into account both base blocks and fractures

An evaluation method and technology of working fluid, which can be used in material inspection products, soil material testing, etc., can solve problems such as the inability to clearly determine the proportion of base blocks and cracks, and the inability to determine, and achieve the effect of low economic cost and simple operation process.

Active Publication Date: 2021-06-29
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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  • A damage evaluation method for working fluid in fractured tight gas formations taking into account both base blocks and fractures
  • A damage evaluation method for working fluid in fractured tight gas formations taking into account both base blocks and fractures
  • A damage evaluation method for working fluid in fractured tight gas formations taking into account both base blocks and fractures

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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 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 9...

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Abstract

The invention discloses a damage evaluation method for a working fluid in a fractured tight gas layer that takes into account both the base block and the fracture, that is, the damage evaluation method that can determine the damage ratio of the base block and the fracture. This method simulates the multi-scale mass transfer path in the process of gas production in fractured tight gas layers. By analyzing the damage degree of the rock sample with full diameter of the fracture and the base blocks after being damaged by the working fluid, the relationship between the base block and the fracture of the rock sample is clarified. The proportion of damage is analyzed to analyze the primary and secondary factors of foundation blocks and cracks in the damage process. In addition, when optimizing the formulation of working fluid for protecting reservoirs, by analyzing the damage ratio of rock sample blocks and fractures, the added storage and protection materials are more targeted, and can also be used for various damage evaluation experiments. Provide new ideas. The invention is easy to operate, can effectively solve the current problem of working fluid damage evaluation in fractured tight gas layers, and can provide an important basis for the optimization of reservoir protection working fluids in fractured tight gas layers and the efficient development of gas reservoirs.

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 Patents(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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