Method for determining influence of acid liquor on Young modulus of compact carbonate through experiments

Abstract

The invention discloses a method for determining influence of acid liquor on Young modulus of compact carbonate through experiments. The method comprises steps as follows: (1), a compact carbonate standard core is selected for use, a uniaxial compressive strength experiment is carried out, and an empirical relationship between uniaxial compressive strength of compact carbonate and the Young modulus is established; (2), a full-diameter core in a target work area is selected for use, a rock indentation instrument is adopted for implement a rock scratching experiment, compressive strength of thecore is tested, and the Young modulus of the core before acid treatment is acquired; (2), the acid liquor and the core are soaked in a high-temperature and high-pressure reactor for a reaction; (4), the core soaked with the acid liquor is subjected to the scratching experiment again in the original scratching experiment position, the compressive strength of the core is tested, the Young modulus ofthe core after acid treatment is acquired, and the influence of the acid liquor on the Young modulus of compact carbonate is determined. The principle is reliable, the operation is simple and convenient, the influence of the acid liquor on the Young modulus of compact carbonate under the reservoir condition is authentically evaluated, and acid fracturing reformation effect of compact carbonate isfurther improved.

Description

technical field [0001] The invention relates to a method for experimentally determining the influence of acid liquid on the Young's modulus of tight carbonate rock in the field of petroleum engineering. The effect of acid liquid on the Young's modulus of tight carbonate rock is quantitatively determined through experiments, and is used for accurate calculation and evaluation of formations. It provides a basis for fracture conductivity after acid fracturing under certain conditions, improves the accuracy of acid fracturing scheme design for tight carbonate rocks, and realizes high-efficiency acid fracturing stimulation of tight carbonate rocks. Background technique [0002] In recent years, a large number of tight carbonate oil and gas reservoirs have been discovered in my country, which has gradually become one of the hotspots of oil and gas exploration and development, such as the Daniudi gas field and Jingbian gas field in the marine Ordos Basin, and the Sinian Moxi in the ...

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Problems solved by technology

However, for tight carbonate rocks, it is difficult for the acid solution to displace into the core, and the acid solution only reacts at the end face of the core. It reflects the change of local rock mechanical properties; on the other hand, triaxial rock mechanical property testing is a destructive test, that is, after the same rock sample is tested for rock mechanical properties, subsequent acid flooding experiments and rock mechanical properties experiments cannot be carried out. The triaxial mechanical test method is difficult to truly reflect the change of the Young's modulus of the same rock sample before and after peracidation, which is not conducive to quantitatively evaluating the impact of acid liquid on the Young's modulus of tight carbonate rocks, and directly affects the flow of acid-etched fractures in acid fracturing design. Accuracy of Capacity Calculations

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