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Method for quantitatively evaluating tight sandstone oil reservoir spontaneous imbibition oil displacement speed

A technology for spontaneous imbibition, tight sandstone applications in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., to avoid errors

Active Publication Date: 2019-08-23
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research methods are mainly based on conventional test and analysis methods, and in the process of research on the mechanism and law of spontaneous imbibition flooding, the analysis and research on the important characteristic parameter of oil displacement speed in different stages of spontaneous imbibition has not been involved.

Method used

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  • Method for quantitatively evaluating tight sandstone oil reservoir spontaneous imbibition oil displacement speed
  • Method for quantitatively evaluating tight sandstone oil reservoir spontaneous imbibition oil displacement speed
  • Method for quantitatively evaluating tight sandstone oil reservoir spontaneous imbibition oil displacement speed

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Embodiment 1

[0029] The method for quantitatively evaluating the spontaneous imbibition displacement rate of tight sandstone reservoirs includes the following steps:

[0030] Step 1. Process the core sample into a core column with a diameter of 2.5 cm and a length of 5.0 cm, and perform oil washing and drying operations on the core;

[0031] Step 2. Configure salinity to 15000mg / L, CaCl 2 Type simulated formation water, the core sample is saturated with simulated formation water at a constant rate of 0.02mL / min, and the injection volume is 2-3PV;

[0032] Step 3, the concentration is the Mn of 30000mg / L 2+ The solution is injected into the core at a constant rate of 0.01mL / min, and the injection volume is 3-4PV to displace the simulated formation water to eliminate the H in the formation water. + Signal;

[0033] Step 4. Prepare experimental simulated crude oil and inject it into the core sample at a constant rate of 0.01mL / min until the outlet fluid produced by the core is 100% simulat...

Embodiment 2

[0045] The method for quantitatively evaluating the spontaneous imbibition displacement rate of tight sandstone reservoirs includes the following steps:

[0046] Step 1. Process the core sample into a core column with a diameter of 2.5 cm and a length of 5.0 cm, and perform oil washing and drying operations on the core;

[0047] Step 2. Configure salinity to 20000mg / L, CaCl 2 Type simulated formation water, the core sample is saturated with simulated formation water at a constant rate of 0.02mL / min, and the injection volume is 2-3PV;

[0048] Step 3, the concentration is the Mn of 30000mg / L 2+ The solution is injected into the core at a constant rate of 0.01mL / min, and the injection volume is 3-4PV to displace the simulated formation water to eliminate the H in the formation water. + Signal;

[0049] Step 4. Prepare experimental simulated crude oil and inject it into the core sample at a constant rate of 0.01mL / min until the outlet fluid produced by the core is 100% simulat...

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Abstract

The invention discloses a method for quantitatively evaluating tight sandstone oil reservoir spontaneous imbibition oil displacement speed. The method comprises the following steps: through an indoorstatic spontaneous imbibition experiment, determining a residual oil distribution T2 spectrum of the tight sandstone core sample at different stages of the spontaneous imbibition by utilizing a magnetic resonance imaging online monitoring technology, computing spontaneous imbibition oil displacement efficiency based on a lower coverage area difference of the magnetic resonance imaging T2 spectrum,and determining the spontaneous imbibition oil displacement efficiency in the unit time by combining the time intervals between the testing points, thereby realizing the quantitative evaluation on the tight sandstone oil reservoir spontaneous imbibition oil displacement speed. The magnetic resonance imaging technology is used for researching the oil displacement efficiency and the imbibition speed of the spontaneous imbibition technology, and the error caused by the traditional experiment testing method can be avoided.

Description

technical field [0001] The invention relates to the technical field of oil and gas development experiments, in particular to a method for quantitatively evaluating the spontaneous imbibition displacement speed of tight sandstone reservoirs. Background technique [0002] Spontaneous imbibition flooding refers to the process in which the porous medium of the reservoir spontaneously absorbs water under the drive of capillary force, and replaces the crude oil in the formation. Tight sandstone reservoirs have small porous media, and some pore throat radii can reach nanometer level. Spontaneous imbibition displacement with capillary force as the main displacement force has a positive role in improving the recovery of tight sandstone reservoirs. In the process of spontaneous imbibition, the imbibition velocity is an important factor affecting the oil displacement efficiency. Quantitative evaluation of the imbibition velocity in different imbibition stages is of great importance for...

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 王琛李腾黄兴高辉张明曹杰
Owner XI'AN PETROLEUM UNIVERSITY
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