Simulating and evaluating method for acidification of carbonate heavy-oil reservoir

A technology for heavy oil reservoirs and carbonate rocks, which is used in earth-moving drilling, fluid production, wellbore/well components, etc., can solve the problem that the morphological characteristics and differences of acid-etched holes cannot be determined, and cannot reflect the properties of formation fluids. Problems such as the effect of acid etching hole formation and expansion

Active Publication Date: 2015-12-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] At present, there is no unified standard for carbonate rock acidification simulation evaluation. Usually, the linear displacement experiment is used to measure the breakthrough time and breakthrough volume of acid liquid, which can reflect the impact of core mineral distribution and pore throat structure on acidification to a certain extent. However, it is impossible to determine the morphological characteristics of acid-etched vugs in the radial flow of acid liquid, and only approximate methods can be used to deal with it,...

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  • Simulating and evaluating method for acidification of carbonate heavy-oil reservoir
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  • Simulating and evaluating method for acidification of carbonate heavy-oil reservoir

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Embodiment

[0054] The experimental object is the core of the Shirinish heavy oil reservoir in the Zagros structural belt in the Middle East. The temperature of the reservoir is 50°C, and the viscosity of the heavy oil is 500-2000mPa.s under the formation conditions. The core of the Shirinish section is taken and processed into several cylindrical pieces. Rock core samples, according to the simulation process of this patent method, carry out the following operations:

[0055] (1) Determination of relevant relevant parameters, the results are shown in Table 1 below:

[0056] Table 1

[0057]

[0058] (2) Wash the core with oil, measure the pore volume, calculate the porosity, and then inject 2% KCl solution at the injection rate to measure the permeability. The results are shown in Table 2. Heat the heavy oil so that its viscosity is lower than 10mpa.s, use the heavy oil to displace the core, wait for the heavy oil to return from the outlet, and end after the flow is stable, lower the ...

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Abstract

The invention relates to a simulating and evaluating method for acidification of a carbonate heavy-oil reservoir. The simulating and evaluating method comprises the steps of i) sample preparation and parameter measuring: taking a rock core sample of an oil reservoir, performing oil washing on the rock core sample, and preparing an acidification simulating experiment rock core through replacing the rock core by crude oil; ii) linear flow acid-etching hole simulation and acidification evaporation: perform linear acidification on the acidification simulating experiment rock core, measuring various parameters, then scanning the rock core by means of a three-dimensional imaging analysis system, obtaining a three-dimensional digital picture of the acidification hole, and finally obtaining a tortuosity factor through analysis; and iii) radial flow acid-etching hole simulation and acidification evaluation: performing radial acidification on the acidification simulating experiment rock core by means of an acid solution, ending after radial breakthrough, scanning the cross section of the rock core by means of the three-dimensional imaging analysis system, and analyzing the obtained acid etching image for obtaining a fractal dimension.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and relates to an acidification simulation evaluation method for carbonate heavy oil reservoirs. Background technique [0002] Acidizing is one of the effective measures to increase the production of carbonate rock reservoirs. Due to the complex reaction mechanism between acid and carbonate rock, there are many influencing factors, and because of the unstable dissolution phenomenon in the acidizing process, that is, acid erosion wormholes, the carbonic acid It is difficult to predict parameters such as the effective action depth of acid liquid in the acidizing process of salt rock by pure theoretical calculation methods, and the optimization of construction parameters and effect prediction must also rely on indoor simulation methods. [0003] At present, there is no unified standard for carbonate rock acidification simulation evaluation. Usually, the linear displacement expe...

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Application Information

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IPC IPC(8): E21B43/22
Inventor 王益维张汝生孟祥龙柯文奇林鑫刘长印汪友平
Owner CHINA PETROLEUM & CHEM CORP
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