Device and method for measuring spontaneous imbibition displacement efficiency in water-wet reservoirs by improved volumetric method
A technology of spontaneous imbibition and oil displacement efficiency, which is applied in the fields of measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., and can solve the problem of large errors in volumetric methods, data that cannot reflect the process of imbibition and oil displacement by imbibition Results and other issues to achieve the effect of improving reliability
Active Publication Date: 2020-09-08
CHINA NAT OFFSHORE OIL CORP +1
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[0004] Aiming at the problem that the above-mentioned conventional volumetric method has a large error and the data cannot reflect the real imbibition process and the result of imbibition displacement, the purpose of the present invention is to provide a device for improving the volumetric method to measure the efficiency of spontaneous imbibition displacement in water-wet reservoirs and method, which effectively compensates for the error of the volumetric method, and has profound significance for the study of self-imbibition in low-permeability reservoirs
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[0033] The present invention will be described below in conjunction with specific models.
[0034] Using outcropping cylindrical sandstone core (length 10cm, diameter 2.5cm, permeability 0.12mμm 2 , pore volume 3.2mL), crude oil viscosity 3mPa.s, crude oil density ρ o is 0.85g / mL, the density of water ρ w It is 1g / mL. The experimental process is that the core is first dried and then weighed to 97.985g, and then evacuated to 100% saturated experimental oil m o It is 2.635g. The core was placed in a funnel container for natural imbibition experiments. The imbibition process is a process of self-absorption of water and oil discharge. When the imbibition is over, record the volume of the oil in the funnel-shaped container as 0.55mL, and use an oil analyzer in water to measure the oil content dissolved in water as 0.22g / L. The volume is 500mL.
[0035] 1) Core saturated crude oil volume V o = saturated oil quality / crude oil density=2.635g / (0.85g / mL)=3.1mL;
[0036] 2) The v...
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Abstract
The invention relates to a device and a method for measuring the oil displacement efficiency of spontaneous imbibition of a water-wet reservoir by an improved volume method. The device comprises a boxbody, a funnel type container, oil-in-water analyzers and a computer system; the funnel type container containing water is arranged in the box body; a rock core is arranged in the funnel type container; the two oil-in-water analyzers are arranged on the side walls of the two sides of the funnel type container at intervals; the oil-in-water analyzers are used for detecting the oil-in-water contentin the funnel type container, and transmitting a detection result to the computer system located outside the box body; and the computer system adopts an arithmetic mean value to calculate out a meanvalue of the oil-in-water content. According to the device and the method, the experimental error of a traditional volume method is avoided.
Description
technical field [0001] The invention relates to the field of oil and gas field development, in particular to a device and method for measuring the spontaneous imbibition displacement efficiency of water-wet oil reservoirs by an improved volumetric method aimed at the spontaneous imbibition phenomenon of water-wet low-permeability oil reservoirs. Background technique [0002] The so-called spontaneous imbibition (referred to as self-priming) is the process in which a porous medium spontaneously absorbs a certain wetting liquid driven by capillary force, which is a common phenomenon under the action of capillary pressure. Fractures are usually developed in water-wet low-permeability reservoirs. In the process of water injection development, the injected water first advances along the fractures, and the water in the fractures drives the crude oil out of the matrix by self-absorption. With the extensive development and application of low permeability reservoirs, imbibition, as a...
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IPC IPC(8): G01N15/08
CPCG01N15/0893
Inventor 赵娟张健康晓东杨光赵文森王全王旭东薛新生
Owner CHINA NAT OFFSHORE OIL CORP