Acquisition method of high-temperature high-pressure reservoir carbon dioxide fluid density skeleton parameters

Abstract

The invention discloses an acquisition method of high-temperature high-pressure reservoir carbon dioxide fluid density skeleton parameters. The method includes the following steps: sampling carbon dioxide fluid; acquiring multiple groups of test experiment data; constructing a primary computing model, to be more specific, utilizing a data fitting analysis method to perform parameter fitting analysis on the multiple groups of data so as to obtain the primary computing model; constructing a density skeleton parameter computing model, to be more specific, on the basis of the primary computing model, utilizing a density well logging response principle to convert volume density of the carbon dioxide fluid into an apparent volume density value so as to obtain the density skeleton parameter computing model; substituting a measured temperature value and a pressure value into the density skeleton parameter computing model to obtain the density skeleton parameters off the carbon dioxide fluid in a high-temperature high-pressure reservoir. By the method, accuracy in acquisition of the carbon dioxide fluid skeleton density parameters can be improved remarkably, further precision in porosity evaluation of high-temperature high-pressure carbon-dioxide-enriched gas reservoir well logging interpretation is improved, and high universality is obtained.

Description

technical field [0001] The invention relates to a logging evaluation technology for porosity interpretation of high-temperature and high-pressure carbon dioxide-rich gas layers in oil and gas exploration technology, and specifically refers to a method for obtaining skeleton parameters of carbon dioxide fluid density in high-temperature and high-pressure reservoirs. Background technique [0002] In the process of logging interpretation and evaluation of high-temperature and high-pressure carbon dioxide-rich gas reservoirs, logging technicians are required to perform timely logging interpretation of the obtained downhole density logging data based on the formation component volume model, obtain the porosity parameters of the gas reservoir, and work The key is to determine the carbon dioxide fluid density framework parameters under formation conditions. The existing method for obtaining the density skeleton parameters of carbon dioxide fluid is mostly the regional empirical met...

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Problems solved by technology

The existing method for obtaining the density skeleton parameters of carbon dioxide fluid is mostly the regional empirical method, which mainly uses the carbon dioxide gas samples taken from the well to conduct PVT experiments, and then obtains the density value at a certain temperature and pressure, which is used as the skeleton parameters of the region However, in the long-term production practice, technicians found that the accuracy of the carbon dioxide fluid density skeleton parameters obtained by the above method is low. The carbon dioxide-rich gas reservoirs have different burial depth ranges on the well, resulting in inconsistent formation pressure and temperature values ​​of the gas reservoirs; in addition, this method is more subjective, and some estimation processes are used; thus, the empirical value of the carbon dioxide fluid density skeleton parameter It is quite different from the value in the actual formation

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