Method using nuclear magnetic resonance-displacement combined device to evaluate tight oil filling process

A technology for tight oil and displacement, which can be used in measurement devices, analysis by nuclear magnetic resonance, water resource assessment, etc., and can solve problems such as research gaps

Active Publication Date: 2018-08-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, the current NMR T 2 Spectrum-displacement joint experiment, the rese

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  • Method using nuclear magnetic resonance-displacement combined device to evaluate tight oil filling process

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Embodiment

[0079] Such as figure 1 As shown, the present invention discloses a method for evaluating the charging process of tight oil by a nuclear magnetic-displacement combined device. The method uses fluorine oil without hydrogen signal to displace the core saturated with formation water (hydrogen signal) through nuclear magnetic Resonance test T 2 The continuous decrease of the signal amplitude of the spectrum reflects the changing process of the formation water in the pores being continuously displaced by fluorine oil. In the experiment, after allowing the fluorine oil to fully contact the core surface at a relatively small displacement pressure of 0.25 MPa, the first constant-rate displacement mode was adopted, and the NMR response was T 2 When the spectrum changes significantly, it is considered that the displacement is obviously proceeding, and then it is changed to the stage constant pressure mode until the NMR T 2 The signal amplitude in the spectrum no longer changes significant...

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Abstract

The invention discloses a method using a nuclear magnetic resonance-displacement combined device to evaluate a tight oil filling process. The method has the advantages that a nuclear magnetic resonance device is operatively connected with a core holding unit to use the nuclear magnetic resonance technology to online monitor a tight sandstone displacement process; the method uses fluorocarbon oil which does not contain a hydrogen signal to displace a core rich in formation water (containing the hydrogen signal), the volume of water which can be detected by the nuclear magnetic resonance is reduced constantly along with the constant proceeding of the oil displacing water process, and the changing process showing that the formation water in pores is constantly displaced by the fluorocarbon oil by the process that the signal amplitude in nuclear magnetic resonance test T2 spectrum during an experiment is constantly lowered; experiment data is processed and analyzed after the experiment, and the processing and analyzing result is combined with geological conditions to comprehensively evaluate the filling process in the formation. The method has the advantages that the nuclear magnetic resonance test can be performed in the optional stage of the experiment, the core does not need to be taken out, the obtained experiment result tallies with actual situations, and help is provided fortight oil reservoir forming researches.

Description

Technical field [0001] The invention belongs to the field of petrochemical technology, and relates to an unconventional oil and gas exploration method, in particular to a method for evaluating a tight oil charging process by a nuclear magnetic-displacement combined device. Background technique [0002] Tight oil is another new hot spot in global unconventional oil and gas exploration and development after shale gas. It mainly refers to the oil resources accumulated in tight sandstone and tight carbonate reservoirs that are interbedded with or adjacent to the source rock series. . Tight oil reservoirs generally have a porosity of less than 10%, the overburden matrix permeability is less than 0.1mD, and a single well has no natural industrial productivity. The low-extra-low porosity and permeability characteristics of tight reservoirs make the charging process of oil different from conventional reservoirs, which is manifested by the characteristics of starting pressure gradient / qu...

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/082Y02A90/30
Inventor 王民关莹刘洋李进步刘薇唐明明卢双舫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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