A test device and method for determining the diffusion distance of injected gas in the process of gas injection and oil recovery

A technology of diffusion distance, test and analysis, applied in the direction of analysis using nuclear magnetic resonance, etc., to achieve the effect of good contrast, improved gas injection and oil recovery efficiency, and high resolution

Active Publication Date: 2022-03-18
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0004] Although some researchers have carried out some work on the application of NMR technology to the study of fluid distribution characteristics in rocks, at present, the use of NMR technology to determine the dissolution and diffusion distance of injected gas in crude oil during gas injection and oil recovery is still a technical blank

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  • A test device and method for determining the diffusion distance of injected gas in the process of gas injection and oil recovery
  • A test device and method for determining the diffusion distance of injected gas in the process of gas injection and oil recovery
  • A test device and method for determining the diffusion distance of injected gas in the process of gas injection and oil recovery

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Embodiment 1

[0045] A method for determining the diffusion distance of injected gas in the process of gas injection and oil recovery, comprising the following steps in sequence:

[0046] (1) Open the high and low temperature test chamber 7 in advance, heat the confining pressure fluid to the reservoir temperature; put 36 reservoir standard plunger cores (length: 5cm; diameter: 2.5cm, average permeability: 101mD) into the core holder In the holder 12, after vacuuming the inside of the holder and the core, saturate the heavy water (replace the formation water with heavy water to eliminate the influence of hydrogen atoms in the actual formation water), and then use the pre-prepared crude oil 4 in the sampler 2 to displace the Establish the original irreducible water saturation (36vol%); keep the circulation injection pump running to ensure that the temperature of the crude oil in the core remains unchanged;

[0047] (2) Inject a certain pressure of CO from the inlet of the holder 2 , the inj...

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Abstract

The invention relates to a test device and method for determining the diffusion distance of injected gas in the process of gas injection and oil production. The device consists of nuclear magnetic resonance host, nuclear magnetic resonance analysis coil, data acquisition and analysis system, crude oil sampler, injection gas container, core holder, confining pressure fluid temperature control and circulation system, back pressure valve and fluid metering system. The method includes: (1) loading the core into the core holder and establishing the original reservoir conditions of the reservoir; (2) injecting a certain pressure of injection gas into the core from the inlet end of the holder; (3) The outer surface is divided into several sections with a ruler, and the nuclear magnetic resonance test and analysis of each section of the holder is carried out step by step through the nuclear magnetic resonance coil; (4) Test each section of the holder again at intervals until all sections are in the middle. The T2 spectrogram signal of the fluid no longer changes with time. The test result of the invention is accurate and reliable, and has important supporting function and practical significance for studying the gas injection oil recovery process and improving the oil recovery rate.

Description

technical field [0001] The invention relates to a gas injection oil recovery simulation device and method in the oil and gas development process, in particular to a test device and method for determining the diffusion distance of injected gas in crude oil in the gas injection oil recovery process based on nuclear magnetic resonance technology. Background technique [0002] With the rapid growth of global oil and gas consumption, finding new blocks and further effectively improving the oil recovery of existing oil reservoirs are the current key tasks of various oil fields. Gas injection and oil recovery benefit from the advantages of low injected gas density / viscosity, large sweep range in the core, and improved properties of crude oil in the reservoir, so it is widely used and has high hopes. Especially for tight oil reservoirs, conventional fluids (water, chemical agents, etc.) cannot be injected, and gas injection is basically the only recovery method at present. Gas inje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 刘煌李瑞景郭平詹思源景明强杜建芬汪周华
Owner SOUTHWEST PETROLEUM UNIV
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