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Method for improving oil displacement efficiency of medium-permeability core

A technology of oil displacement efficiency and core, which is applied in the field of improving the oil displacement effect of medium-permeability cores, and can solve the problems of unclear pore throat production degree and remaining oil distribution range, and weak pertinence.

Active Publication Date: 2014-07-23
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem is that the degree of pore-throat production and the distribution range of remaining oil under different displacement modes are not clear, and the pertinence is not strong.

Method used

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  • Method for improving oil displacement efficiency of medium-permeability core
  • Method for improving oil displacement efficiency of medium-permeability core
  • Method for improving oil displacement efficiency of medium-permeability core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 As shown, the method for improving the medium-permeability core oil displacement effect of the present invention comprises the following steps:

[0048] Step 1. Drill a core with a diameter of 2.5cm and a length of 6.064cm from the full-diameter core. After washing oil, the gas permeability of the core is 302×10 -3 μm 2 ;

[0049] Step 2, prepare simulated formation water, the salinity of formation water is 240000mg / L;

[0050] Step 3, prepare simulated crude oil, the viscosity reaches 1.82mPa.s;

[0051] Step 4. Place the core in a high-pressure saturation device to saturate the core with simulated formation water. The measured porosity is 29.30%, and the pore volume is 8.43ml; the calculated pore volume is realized by the following formula:

[0052] V = π × R 2 × L 4

[00...

Embodiment 2

[0065] Steps 1 to 7 of the method for improving the oil displacement effect of medium-permeability cores are the same as in Example 1, except that in step 8, foam liquid + carbon dioxide gas is injected for 5 rounds, and in step 9, carbon dioxide gas + Mn-containing gas is injected 2+ 1 round of simulated formation water, inject foam liquid + carbon dioxide gas + carbon dioxide and Mn in step ten 2+ 5 rounds of simulated formation water.

Embodiment 3

[0067] Steps 1 to 7 of the method for improving the oil displacement effect of medium-permeability cores are the same as in Example 1, except that in step 8, foam liquid + carbon dioxide gas is injected for one round, and in step 9, carbon dioxide gas + Mn-containing gas is injected 2+ 8 rounds of simulated formation water, injecting foam liquid + carbon dioxide gas + carbon dioxide and Mn in step ten 2+ 1 round of simulated formation water.

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Abstract

The invention discloses a method for improving the oil displacement efficiency of a medium-permeability core. The method comprises the following steps: taking a core for an experiment, washing oil away and drying the core, conducting a gas survey on the permeability of the core; preparing experimental simulated formation water and simulated oil; immersing the core into the simulated formation water to enable the core to be saturated with the simulated formation water; measuring the porosity, and calculating the pore volume; preparing simulated formation water solution, and replacing the saturated simulated formation water core; using simulated crude oil to replace the core to detect a nuclear magnetic resonance spectrum, using the simulated formation water solution to replace the core to calculate the oil displacement efficiency; injecting foam liquid+carbon dioxide to calculate the oil replacement efficiency, and detecting a nuclear magnetic resonance spectrum; injecting carbon dioxide gas+simulated formation water to calculate the oil replacement efficiency; injecting the foam liquid+carbon dioxide and carbon dioxide+simulated formation water containing the to calculate the oil displacement efficiency; comparing different nuclear magnetic resonances, adding the oil replacement efficiencies under different replacement methods, and obtaining the total oil replacement efficiency. According to the method for improving the oil displacement efficiency of the medium-permeability core, on-line tests can be achieved, a sample does not need to be disassembled and assembled, and practical testing is conducted to improve the oil replacement efficiency of the medium-permeability core.

Description

technical field [0001] The invention relates to the technical field of oil and gas development experiments, in particular to a method for improving the oil displacement effect of medium-permeable rock cores. Background technique [0002] Different displacement methods and injection parameters have different effects on the oil displacement effect of medium-permeability cores. Clarifying the degree of pore-throat production and the range of pore-throats where remaining oil occurs under different displacement conditions, and then changing injection parameters in time can effectively improve the medium-permeability core. The oil displacement effect of the core. In the existing research, patent CN101210487 discloses a design method for designing oil field development EOR technology by using the test results of reservoir pore size distribution. Patent CN101864936A discloses oil recovery technology of self-generated carbon dioxide flooding in oil layers. Patent CN1424484 disclose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16
Inventor 高辉肖曾利闫健黄海杨玲张益
Owner XI'AN PETROLEUM UNIVERSITY
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