Method for determining influence of acid liquor on mechanical properties of carbonate rocks by surface embedding
A technology of mechanical properties and carbonate rock, applied in the field of influence of mechanical properties of carbonate rock, can solve the problems of large fluctuation range of Brinell hardness test value, inability to accurately reflect the influence law of acid-rock reaction and so on
Inactive Publication Date: 2020-11-03
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
M.Pournik (2011) pointed out that due to the large fluctuation range of the Brinell hardness test value, it cannot accurately reflect the influence of acid-rock reaction on the mechanical properties of the fracture surface
Method used
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Embodiment 1
[0042] Taking the Ordos Basin as the research area, the effect of acid solution on the mechanical properties of carbonate rocks is determined. The specific steps are as follows:
[0043] (1) Collect downhole cores of tight carbonate rock in the Ordos Basin, and make standard cylindrical rock samples with a diameter of 25 mm and a length of 50 mm, and polish the end faces of the two rock samples to make the non-parallelism of the two end faces less than 0.05 mm;
[0044] (2) Test the density, porosity, permeability, longitudinal wave velocity and shear wave velocity of the rock sample, and the test results are shown in Table 1;
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Abstract
The invention discloses a method for determining the influence of acid liquor on the mechanical properties of carbonate rocks by surface embedding, which mainly comprises the following steps: making two groups of compact carbonate rocks with basically consistent density, porosity, permeability and acoustic velocity into a standard cylindrical rock sample, and dividing the standard cylindrical rocksample into an acid treatment group and an original state group; putting the acid treatment group rock sample into a rock core displacement device, carrying out an acid liquid displacement experimentto obtain an acid damage group rock sample, and recording the change of flow and pressure along with displacement time in the displacement process; respectively carrying out surface embedding experiments on the acid damage group rock sample and the original state group rock sample by utilizing a flat-bottom cylindrical pressure head, and recording experiment process parameters; calculating the mechanical property of the rock sample according to the experiment process parameters and the parameters of the flat-bottom cylindrical pressure head; and comparing the mechanical properties of the aciddamage group rock sample and the original state group rock sample, and determining the influence of the acid liquid on the mechanical properties of the compact carbonate rock. The method is reliablein principle and simple and convenient to operate, and truly reflects the influence of acid liquor on the mechanical property of the compact carbonate rock.
Description
technical field [0001] The invention belongs to the technical field of oil and natural gas exploration and development, and relates to a method for determining the influence of acid liquid on the mechanical properties of carbonate rocks by surface embedding. Background technique [0002] Acid treatment is the main measure for stimulation and stimulation of carbonate reservoirs, including acidizing and acid fracturing technology. During the acidizing construction, the acid liquid flows into the rock matrix and undergoes acid-rock reaction, dissolves reactive minerals, expands the pore space and forms flow channels, and increases the production of oil and gas reservoirs; during the acid fracturing construction, the acid liquid is squeezed into the reservoir under high pressure. , the acid solution produces non-uniform etching on the surface of artificial fractures or natural fractures, forming acid-etched fractures with a certain conductivity, providing flow channels for fluid...
Claims
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IPC IPC(8): G01N3/42
CPCG01N3/42G01N2203/0019G01N2203/0048G01N2203/0075G01N2203/024
Inventor 郭建春赖杰王琨周航宇苟波
Owner SOUTHWEST PETROLEUM UNIV