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Method for evaluating migration ability of imbibition leading edge of shale gas reservoir

A shale gas and shale technology, which is applied in the field of evaluating the self-priming front migration capacity of shale gas reservoirs, can solve the problems that cannot effectively describe the distribution relationship between water saturation and advancing distance, and improve development efficiency , easy to control, simple operation effect

Inactive Publication Date: 2018-12-21
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current research on shale self-imbibition mainly adopts the method of discussing the relationship between liquid absorption time and absorption amount in shale samples. This method cannot effectively describe the characteristics of rock samples in different time periods during the self-imbibition process. Distribution relationship between water saturation and advancing distance

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  • Method for evaluating migration ability of imbibition leading edge of shale gas reservoir
  • Method for evaluating migration ability of imbibition leading edge of shale gas reservoir
  • Method for evaluating migration ability of imbibition leading edge of shale gas reservoir

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Embodiment 1

[0041]Embodiment 1 of the present invention provides a method for evaluating the migration ability of the self-absorption front of a shale gas reservoir, and the specific implementation method is as follows:

[0042] First, put the cylindrical shale test sample with a height of 30mm and a bottom diameter of 25mm in an oven at 95°C to dry until the weight no longer changes, and then cool it to room temperature; secondly, place the cooled shale test sample in a On the permeable stone in the container, the container contains deionized water, and the fluid starts to infiltrate from the bottom of the shale test sample; then the shale test sample is taken out of the fluid at four time points of 10h, 20h, 60h, and 120h , starting from the bottom, scan with a low magnetic field strength nuclear magnetic resonance instrument at intervals of 4mm until the upper surface of the shale test sample. After the scan is completed, four sets of resonances corresponding to the four time points of ...

Embodiment 2

[0047] Embodiment 2 of the present invention provides a method for evaluating the migration ability of the self-absorption front of a shale gas reservoir, and the specific implementation method is as follows:

[0048] First, the cylindrical shale test sample with a height of 25 mm and a bottom diameter of 25 mm was dried in an oven at 90 °C until the weight no longer changed, and then cooled to room temperature; secondly, the cooled shale test sample was placed in a On the permeable stone in the container, the container contains deionized water, and the fluid starts to infiltrate from the bottom of the shale test sample; then the shale test sample is taken out of the fluid at four time points of 8h, 18h, 55h, and 110h , starting from the bottom, scanning with a low magnetic field strength nuclear magnetic resonance instrument at intervals of 4mm until the upper surface of the shale test sample. After the scanning is completed, four sets of resonances corresponding to the four t...

Embodiment 3

[0053] Embodiment 3 of the present invention provides a method for evaluating the migration ability of the self-absorption front of a shale gas reservoir, and the specific implementation method is as follows:

[0054] First, put a cylindrical shale test sample with a height of 35mm and a bottom diameter of 25mm in an oven at 100°C to dry until the weight no longer changes, and then cool it to room temperature; secondly, place the cooled shale test sample in a On the permeable stone in the container, the container contains deionized water, and the fluid starts to infiltrate from the bottom of the shale test sample; then the shale test sample is taken out of the fluid at four time points of 12h, 22h, 65h, and 130h , starting from the bottom, scanning with a low magnetic field intensity nuclear magnetic resonance instrument at intervals of 4mm until the upper surface of the shale test sample. After the scanning is completed, four sets of resonances corresponding to the four time p...

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Abstract

A method for evaluating migration ability of an imbibition leading edge of a shale gas reservoir is specifically carried out according to the following steps: step 1, collecting and pre-treating a shale test sample; step 2, placing the shale test sample pre-treated in the step 1 in a fluid that begins to infiltrate from the bottom of the shale test sample; step 3, radially scanning the shale testsample by a low magnetic field intensity nuclear magnetic resonance spectrometer at different time points until the shale test sample is completely saturated with the fluid to obtain resonance signalamplitudes corresponding to different time points; and step 4, converting the resonance signal amplitudes of the step 3 into water saturations, and plotting a graph about the water saturations and theforward distances of the shale test sample penetration at different time points, so that a shale imbibition ability test is completed. The invention uses the nuclear magnetic resonance technology toobtain a graph of water saturations and forward distances of the shale test sample in different periods of imbibition, which can be used to guide the development of shale gas.

Description

technical field [0001] The invention belongs to the technical field of oil and gas development experiments, and in particular relates to a method for evaluating the migration ability of a self-absorption front of a shale gas reservoir. Background technique [0002] As an important unconventional resource, shale gas has huge reserves all over the world. Studies have shown that multi-stage hydraulic fracturing of horizontal wells is the most effective technology currently available for developing shale oil and gas reservoirs. Compared with hydraulic fracturing in conventional oil and gas reservoirs, hydraulic fracturing in shale reservoirs has the characteristics of low fracturing fluid flowback efficiency, which leads to the retention of a large amount of fracturing fluid in shale reservoirs. After investigating a large amount of production data of shale reservoirs, it is found that the flowback efficiency of fracturing fluid is only between 10% and 40%, and the retained frac...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 黄兴李天太任宗孝高辉王琛曹杰
Owner XI'AN PETROLEUM UNIVERSITY
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