Shale reservoir microscopic wettability determination method and device

A shale reservoir and measurement method technology, applied in the field of petroleum exploration, can solve the problems of inability to accurately measure the microscopic wettability of shale, and achieve the effect of simple operation and good repeatability

Active Publication Date: 2016-06-01
PETROCHINA CO LTD
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Problems solved by technology

[0005] In order to overcome the inability to accurately measure the microscopic wettability of shale in the prior art, an embodiment of the present invention provides a method for measuring the microscopic wettability of shale reservoirs, including:

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  • Shale reservoir microscopic wettability determination method and device

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] figure 1 It is a flow chart of determining wettability of shale microscopic reservoirs in an embodiment of the present invention. As shown in the figure, the assay method includes:

[0038] Step S101: collect fresh shale cores, and pass through a 460-mesh sieve for use after rapid mechanical crushing (particle diameter is less than 30 μm);

[0039] Step S102: Take 10 mg of the crushed sample in step S101, put it into a high-temperature-resistant, high...

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Abstract

The invention provides a shale reservoir microscopic wettability determination method and a device. The method comprises the following steps of smashing a shale core to acquire a core sample with the particle diameter being less than 30mu m; adding 10mg of core sample into a glass tube, adding 10ml of saline solution for mixing, and aging for 48h; after finishing aging, separating the saline solution from the glass tube, and keeping saline and a wet sample; adding 10ml of in-place oil into the glass tube containing the wet sample, and aging for 48h; adding the kept saline into the glass tube with oil and rock powder, stirring and mixing, and settling for 24h; extracting an upper layer of crude oil and oil wettability substances in the settled glass tube, utilizing an organic solvent to clean and dry, and acquiring an oil wetting substance; drying a water wettability rock kept in the glass tube, and acquiring a water-wet mineral; utilizing a scanning electron microscope and an XRD (X-Ray Diffraction) analytical test to confirm the components of the oil wetting substance and the water-wet mineral, and generating a determination result. The invention provides the shale reservoir microscopic wettability determination method with open type conditions, simplicity and practicability.

Description

technical field [0001] The invention relates to oil exploration technology, in particular to a method and device for measuring microscopic wettability of shale reservoirs. Background technique [0002] Currently, petroleum geology studies on shale are limited to source rock and cap rock evaluation. In recent years, shale oil and gas has gradually become a focus of exploration and research in the field of unconventional oil and gas at home and abroad. It has been recognized that the pore structure of shale is very complex, including intergranular pores, intragranular pores, clay mineral micropores and organic pores. Compared with conventional sandstone reservoirs, shale is mainly composed of clay-sized particles, has several times the specific surface area of ​​conventional sandstone, and has very low permeability (Nadasy-micro-Darcy). [0003] In the prior art, the Amott-Harvey method and the USBM method are based on the principle of self-priming, and are relatively slow, e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
CPCG01N13/00
Inventor 崔景伟朱如凯
Owner PETROCHINA CO LTD
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