Method for predicting failure pressure of reservoir with acid damage

A fracture pressure and reservoir technology, applied in the field of oil and gas field development, can solve the problems of reducing the effect of reducing reservoir fracture pressure, casing damage, etc.

Inactive Publication Date: 2011-04-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0010] 4) High-energy gas fracturing has a significant destructive effect on the casing. In deep and ultra-deep wells, due to the influe

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  • Method for predicting failure pressure of reservoir with acid damage
  • Method for predicting failure pressure of reservoir with acid damage
  • Method for predicting failure pressure of reservoir with acid damage

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Embodiment Construction

[0073] Further illustrate the present invention below in conjunction with accompanying drawing.

[0074] A method for predicting reservoir fracture pressure after acid damage mainly includes the following steps:

[0075] (1) Prepare a standard cylindrical rock sample that meets the experimental conditions:

[0076] A standard cylindrical sample of 25.4 mm × 50.0 mm is drilled in the reservoir rock pillar retrieved from the site with a diamond core drill bit, and then the two ends of the cylindrical sample are flattened and polished, and the cracks in the process;

[0077] (2) A well-prepared rock sample cylinder is analyzed through the whole rock ore to obtain the single mineral type, composition and content of the reservoir rock, and the initial radius of the single mineral cylinder is calculated:

[0078] 1) Take a prepared rock sample cylinder, crush it with a jaw crusher to a particle size of 0.5-1.0mm, and take 10-20g by shrinkage method for later use. Epoxy resin is u...

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Abstract

The invention relates to a method for predicting failure pressure of a reservoir with acid damage. The method mainly comprises the following steps of: (1) preparing a standard cylinder rock sample in accordance with experimental conditions; (2) identifying mineral components of a rock cylinder, determining monomineral content, and calculating initial radius of a monomineral cylinder; (3) performing acid damage treatment on the rock sample; (4) testing the standard rock sample, and Young modulus, poisson ratio and compressive strength under the conditions of ambient pressure of the rock sample subjected to acid damage treatment; (5) calculating damage variable of the rock under the conditions of different acid liquor types, acid using amount and acid action time; (6) preparing rock mechanics parameters for predicting the failure pressure of the reservoir subjected to acid damage treatment; and (7) predicting the failure pressure of the reservoir subjected to acid damage treatment. By the method provided with the invention, the defects of the prior art can be overcome, and the problem of prediction precision of the failure pressure of the reservoir subjected to acid damage treatment can be effectively solved so as to provide reasonable basic data for the optimization design for the fracture of the reservoir and improve the success rate of reservoir reconstruction.

Description

technical field [0001] The invention relates to a technology for predicting fracture pressure of reservoirs after acid damage during fracturing reconstruction in the field of oil and gas field development. Background technique [0002] Fracturing is an effective measure to increase the production and ultimate recovery of oil and gas wells. It injects fracturing fluid and proppant into the formation, and after the fracture is closed, due to the supporting effect of the proppant on the fracture wall, the fracture surface cannot be completely closed but still has a certain flow conductivity, thereby improving the seepage capacity of the oil and gas well, making Oil and gas wells have been stimulated and enhanced ultimate recovery. At present, perforation is usually used to pretreat the reservoir before fracturing. It is to lower the perforator and locate it in a certain section of the oil and gas well, to open channels in the casing, cement sheath and formation, and make the f...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/27
Inventor 郭建春曾凡辉苟波
Owner SOUTHWEST PETROLEUM UNIV
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