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Method for determining water-soluble salt formation water salinity and rock core salt-leaching degree

A technology for formation water salinity and water-soluble salt, which is applied in the preparation of test samples, material thermal analysis, instruments, etc., can solve the problems that affect the evaluation of tight reservoirs and cannot accurately test the in-situ porosity of cores, etc. To achieve the objective effect of experimental results

Active Publication Date: 2020-01-17
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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  • Method for determining water-soluble salt formation water salinity and rock core salt-leaching degree
  • Method for determining water-soluble salt formation water salinity and rock core salt-leaching degree
  • Method for determining water-soluble salt formation water salinity and rock core salt-leaching degree

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Embodiment Construction

[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 water produced 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 residue Type and ratio, ...

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Abstract

The invention relates to the field of petroleum and natural gas tight reservoir rock core analysis, and the method considers that salt crystallization occurs in a rock sample in the process of takinga water-soluble salt reservoir rock core from a stratum temperature and pressure condition to a ground temperature and pressure condition, so that salt leaching treatment needs to be carried out on the rock core before parameters such as porosity are tested. According to the method, only the salt content influencing the porosity due to the crystallization effect in the process of taking an in-siturock sample to the ground can be cleaned so that the porosity of the rock core tested after salt leaching is objective and real, the formation water mineralization degree is determined through adoption of the mass conservation principle, so that a foundation is laid for follow-up tight reservoir experiment evaluation, and the method is an experiment method in the aspect of rock core analysis in the petroleum and natural gas exploration and development process.

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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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