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A Method for Determining the Salinity Degree of Water-Bearing Salt Formation and the Degree of Salt Washing in Rock Core

A technology of formation water salinity and water-soluble salt, which is applied in the preparation of test samples, instruments, suspension and porous material analysis, etc., can solve the problem of inability to accurately test the in-situ porosity of cores and affect the evaluation of tight reservoirs And other issues

Active Publication Date: 2022-02-01
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0003] Conventional salt washing will wash away the water-soluble salt formed during reservoir deposition and the crystallized salt during in-situ rock sampling to the ground, resulting in the inability to accurately test the in-situ porosity of cores, thus affecting the evaluation of tight reservoirs

Method used

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  • A Method for Determining the Salinity Degree of Water-Bearing Salt Formation and the Degree of Salt Washing in Rock Core

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[0017] In order to explain more clearly the technical characteristics, purpose and beneficial effects of the present invention, the content and characteristics of the present invention are further described in detail in conjunction with specific parameters and embodiments. The specific steps are as follows:

[0018] Step 1. Prepare anhydrous methanol solution, select a representative rock core of a water-soluble salt reservoir, weigh the dried core mass m', and determine the fully saturated water volume V of the core fluid and density ρ;

[0019] Step 2, using an atomic absorption spectrophotometer to analyze the salinity C' of the formation water produced on the ground from the water-soluble salt reservoir;

[0020] Step 3. Crush a part of the rock sample into powder and mix it with water in a certain proportion, vibrate on the oscillator, filter after a period of time, and then dry the filtrate, and analyze the water-soluble salt minerals in the reservoir through the dried r...

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Abstract

The invention relates to the field of core analysis of tight oil and natural gas reservoirs. The method takes into account the fact that salt crystallization occurs inside the rock sample during the process of taking water-soluble salt reservoir cores from formation temperature and pressure conditions to surface temperature and pressure conditions. Therefore, in the test of parameters such as porosity The core should be washed and salted before. This method will only wash away the amount of salt that affects the porosity due to crystallization during the process of taking the in-situ rock sample to the surface, so that the core porosity tested after salt washing is objective and true, and at the same time, the formation water is determined by the principle of mass conservation. It is an experimental method for core analysis in the process of oil and gas exploration and development.

Description

technical field [0001] The invention relates to a method for determining the salinity degree of formation water containing water-dissolved salt and the degree of salt washing of rock cores in the field of oil and natural gas tight reservoir rock core analysis, which belongs to the experimental method of rock core analysis in the process of oil and gas exploration and development. Background technique [0002] With the increasing demand for oil and gas around the world, the depletion of conventional oil and gas resources, and the rapid development of low-carbon economy, the unconventional oil and gas with realistic exploration and development significance and huge resources (mainly including tight sandstone oil and gas reservoirs, tight carbon Salt rock reservoirs, shale reservoirs and coalbed methane) are increasingly favored by various countries and oil companies. The degree of understanding of the geological characteristics of oil and gas reservoirs potentially determines ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/34G01N25/14G01N21/31G01N15/08
CPCG01N1/34G01N25/147G01N21/3103G01N15/088
Inventor 游利军邵佳新康毅力谭启贵刘涛徐弋影黄恒清王福荣李可明
Owner SOUTHWEST PETROLEUM UNIV
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