Testing device and method for determining diffusion distance of injected gas in gas injection and oil extraction process

A technology of diffusion distance and test device, which is applied in the direction of analysis using nuclear magnetic resonance, etc., to achieve the effect of high resolution, good contrast and intuitive test effect.

Active Publication Date: 2020-06-05
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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  • Testing device and method for determining diffusion distance of injected gas in gas injection and oil extraction process
  • Testing device and method for determining diffusion distance of injected gas in gas injection and oil extraction process
  • Testing device and method for determining diffusion distance of injected gas in gas injection and oil extraction process

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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 testing device and method for determining the diffusion distance of injected gas in the gas injection and oil extraction process. The device is composed of a nuclear magnetic resonance host, a nuclear magnetic resonance analysis coil, a data acquisition and analysis system, a crude oil sample preparation device, an injection gas container, a rock core holder, a confiningpressure liquid temperature control and circulation system, a back pressure valve and a fluid metering system. The method comprises the following steps: (1) putting a rock core into a rock core holder and establishing an original reservoir condition of an oil reservoir; (2) injecting injection gas with a certain pressure into the rock core from the inlet end of the holder; (3) dividing the outersurface of the holder into a plurality of sections by using a scale, and gradually performing nuclear magnetic resonance test analysis on each section of the holder through a nuclear magnetic resonance coil; and (4) testing each section of the holder again at set intervals until T2 spectrogram signals of the fluid in all sections do not change along with time. The test result is accurate and reliable, and the method has important supporting effect and practical significance for researching the gas injection oil extraction process and improving the crude oil recovery ratio.

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 Applications(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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