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Method for judging wettability of reservoir rock

A wettability and rock technology, applied in the field of petroleum exploration, can solve problems such as complicated operation procedures and difficult reservoir rock wettability judgment

Active Publication Date: 2010-12-15
PETROCHINA CO LTD
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Problems solved by technology

[0003] Previous studies on the wettability of reservoir rocks used methods such as contact angle measurement, Amott method (self-priming method) and USBM method (self-priming centrifugal displacement method). The operating procedures of these two methods are relatively complicated, especially The USBM method requires the use of an ultra-high-speed centrifuge designed for special cores, which is rarely used due to equipment constraints, so the above method is difficult to judge the wettability of reservoir rocks on well logging

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[0013] 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.

[0014] The NMR relaxation time depends on the spin of the nucleus and the interaction of the surrounding medium. On the contact surface of solid-liquid two media, due to the existence of the interface phenomenon of wettability, a special region is formed near the contact surface. The fluid molecules in this region move slower than free fluid and are deflected by the magnetic field. The nuclei of atoms more easily transfer energy to the surrounding environment,...

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Abstract

The invention provides a method for judging the wettability of a reservoir rock. The method comprises the following steps of: measuring free relaxation time of oil and water respectively; measuring transverse relaxation time of the oil and the water in saturated states respectively; measuring a nuclear magnetic resonance signal of the reservoir rock in the co-presence of an oil phase and a water phase by using nuclear magnetic resonance technology and recording an oil saturation value and a water saturation value in the co-presence of the oil phase and the water phase; dipping the rock core of the reservoir rock in the co-presence of the oil phase and the water phase in more than or equal to 20,000 ppm paramagnetic solution, waiting for at least 48 hours and separating the nuclear magnetic resonance signal of the reservoir rock in the co-presence of the oil phase and the water phase to obtain the transverse relaxation time of the oil and the water reflecting the size of an oil wet area and a water wet area; and calculating a wettability index in the co-presence of the oil phase and the water phase according to the free relaxation time of the oil and the water, the transverse relaxation time of the oil and the water in the saturated states, the transverse relaxation time of the oil and the water, the oil saturation value and the water saturation value so as to judge the wettability of the reservoir rock.

Description

technical field [0001] The invention relates to petroleum exploration technology, in particular to a method for judging the wettability of reservoir rocks. Background technique [0002] Wettability is a property that exists on the surface of solids and liquids. When immiscible two-phase fluids (oil and water or water and gas) come into contact with the solid phase of rock, one of the fluid phases along the surface of the rock The phenomenon of spreading is wetting phenomenon, and the wettability of rocks is generally divided into three categories: oil wet, water wet and intermediate wet. Reservoir wettability controls the distribution of reservoir fluids and affects the conduction pathways of fluids. At the same saturation, the resistivity of an oil-wet reservoir will be higher than that of a water-wet reservoir. The wettability of reservoir rocks is mostly water-wet, which makes the Archie formula based on the water-wetness of reservoirs be able to identify oil layers and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N24/08
Inventor 胡法龙周灿灿刘忠华徐红军李潮流
Owner PETROCHINA CO LTD
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