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Method for evaluating static contribution rate of spontaneous imbibition effect on oil displacement efficiency during water flooding

A technology for spontaneous imbibition and oil displacement efficiency, applied in the fields of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc., capable of solving the quantitative evaluation method of the static contribution rate of spontaneous imbibition effect that has not been involved or seen and other issues to achieve the effect of accurate calculation

Active Publication Date: 2019-09-20
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

The existing research does not involve the research on the contribution mechanism of the spontaneous imbibition effect to the oil displacement efficiency in the water flooding process of tight sandstone, nor does it involve the quantitative evaluation of the static contribution rate of the spontaneous imbibition effect in the water flooding process Method and Theory

Method used

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  • Method for evaluating static contribution rate of spontaneous imbibition effect on oil displacement efficiency during water flooding
  • Method for evaluating static contribution rate of spontaneous imbibition effect on oil displacement efficiency during water flooding
  • Method for evaluating static contribution rate of spontaneous imbibition effect on oil displacement efficiency during water flooding

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Experimental program
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Effect test

Embodiment 1

[0034] Step 1, processing the experimental rock core sample into a core column with a diameter of 25 mm and a length of 50 mm, and carrying out oil washing operation;

[0035] Step 2. According to the composition characteristics of the formation water in the coring layer, prepare the simulated formation water with a salinity of 25000 mg / L for the experiment, and fully saturate the simulated formation water for the experimental core sample by the vacuum saturation method;

[0036] Step three, use MnCl 2 The concentration of reagent configuration is 20000mg / L of Mn 2+ solution, with a constant flow rate of 0.1mL / min to displace the simulated formation water in the core, and the injection volume is 3-4PV;

[0037] Step 4: prepare simulated crude oil, saturate the core sample with a constant flow rate of 0.1mL / min, and establish the original oil-water distribution in the formation; saturate until the oil content of the core outlet production fluid reaches 100%, and perform nuclea...

Embodiment 2

[0046] Step 1, processing the experimental rock core sample into a core column with a diameter of 25 mm and a length of 50 mm, and carrying out oil washing operation;

[0047] Step 2. According to the composition characteristics of the formation water in the coring layer, prepare the simulated formation water with a salinity of 25000 mg / L for the experiment, and fully saturate the simulated formation water for the experimental core sample by the vacuum saturation method;

[0048] Step three, use MnCl 2 The concentration of reagent configuration is 20000mg / L of Mn 2+ solution, with a constant flow rate of 0.1mL / min to displace the simulated formation water in the core, and the injection volume is 3-4PV;

[0049] Step 4: prepare simulated crude oil, saturate the core sample with a constant flow rate of 0.1mL / min, and establish the original oil-water distribution in the formation; saturate until the oil content of the core outlet production fluid reaches 100%, and perform nuclea...

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Abstract

The invention relates to a method for evaluating the static contribution rate of a spontaneous imbibition effect on oil displacement efficiency during water flooding. According to the method, a nuclear magnetic resonance technology is combined with an indoor spontaneous imbibition physical simulation experiment; under the premise that the spontaneous imbibition effect acting time of a rock core sample is determined, the experiment rock core is subjected to a full spontaneous imbibition oil-displacement experiment, and after spontaneous imbibition is terminated, a water flooding experiment is carried out at a constant displacement speed; residual oil distribution characteristics obtained after spontaneous imbibition oil displacement and water flooding are compared with original oil distribution characteristics; and on the basis of the area difference value of nuclear magnetic resonance T2 spectrograms, the static contribution rate of the spontaneous imbibition effect on the oil displacement efficiency is quantitatively calculated. By means of nuclear magnetic resonance T2 spectra, the distribution rules of residual oil in porous media with different scales can be quantitatively characterized in the spontaneous imbibition oil displacement process of a tight sandstone oil reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas development experiments, in particular to a method for evaluating the static contribution rate of spontaneous imbibition to water flooding efficiency. Background technique [0002] The porous medium of tight reservoirs has small radius, complex structure, and strong heterogeneity, and has the basic conditions for spontaneous imbibition to occur. How to reasonably use spontaneous imbibition to improve the efficiency of water flooding has become an important issue in unconventional tight sandstone reservoirs in recent years. Research hotspots in the field of enhanced oil recovery. Through innovative indoor experiment methods, combined with advanced theoretical analysis methods, evaluate the static contribution of spontaneous imbibition effect to oil displacement efficiency in the process of tight sandstone water flooding, and clarify the mechanism of spontaneous imbibition flooding, which will b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/08G01N2015/0873
Inventor 王琛高媛曹杰黄兴李天太高辉赵金省窦亮彬
Owner XI'AN PETROLEUM UNIVERSITY
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