Gas-volumetric method in laboratory research practice of rocks collector properties
Abstract
Problem statement. Gas-volumetric method of porosity and density in rocks collectors’ determination is becoming more and more popular in production and educational practice. The theory and practice of this method in the domestic literature is not sufficiently covered, there is a lack of literature on the principles of the obtained results and comparison of gas-volumetric method results with the saturation method, which until now has been the main method for determining porosity and density of rocks.
The purpose of this work is to study gas-volumetric method in – depth, to compare its results with the results of the liquid saturation method, determine the convergence between these methods and the possibility of their interchangeability in the complex of laboratory studies of reservoir properties.
A scientific and practical value is conditioned by the fact that porosity of collectors is a basic calculation parameter. Accuracy of hydrocarbon supply depends on it.
Preliminary analysis of the available material. All available material on the design and operation of gas-volumetric devices were analyzed for this purpose and a simple but sufficiently complete description of the methodology and the operation principle of devices suitable for workers at production laboratories and students undergoing training on these devices was given.
The comparison of the results. Before comparison, the results were checked for convergence on the standards and on the samples. After confirming the performance of the device and its compliance with the specifications stated in its technical passport, we switched to the comparison of different methods. By comparing the results of open porosity, apparent mineralogical density, volumetric density obtained by the gas-volumetric method and saturation with kerosene and water we came to certain conclusions.
The main conclusions are: 1. The scope of exclusive application of the gas-volumetric method is defined. 2. The quantitative correlation of the above parameters on the results of the gas-volumetric method and the saturation method by reservoir water or kerosene is established. 3. The increase in porosity was estimated by the gas-volumetric method. 4. Introduction of correction factors of one method results to the results of another one is proved and their values are preliminarily estimated.
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References
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