Method for quantitatively evaluating tight sandstone oil reservoir spontaneous imbibition oil displacement speed

A technology for spontaneous imbibition, tight sandstone applications in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., to avoid errors
CN110160933AActive Publication Date: 2019-08-23XI'AN PETROLEUM UNIVERSITY
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
XI'AN PETROLEUM UNIVERSITY
Publication Date
2019-08-23

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Abstract

The invention discloses a method for quantitatively evaluating tight sandstone oil reservoir spontaneous imbibition oil displacement speed. The method comprises the following steps: through an indoorstatic spontaneous imbibition experiment, determining a residual oil distribution T2 spectrum of the tight sandstone core sample at different stages of the spontaneous imbibition by utilizing a magnetic resonance imaging online monitoring technology, computing spontaneous imbibition oil displacement efficiency based on a lower coverage area difference of the magnetic resonance imaging T2 spectrum,and determining the spontaneous imbibition oil displacement efficiency in the unit time by combining the time intervals between the testing points, thereby realizing the quantitative evaluation on the tight sandstone oil reservoir spontaneous imbibition oil displacement speed. The magnetic resonance imaging technology is used for researching the oil displacement efficiency and the imbibition speed of the spontaneous imbibition technology, and the error caused by the traditional experiment testing method can be avoided.
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Description

technical field

[0001] The invention relates to the technical field of oil and gas development experiments, in particular to a method for quantitatively evaluating the spontaneous imbibition displacement speed of tight sandstone reservoirs. Background technique

[0002] Spontaneous imbibition flooding refers to the process in which the porous medium of the reservoir spontaneously absorbs water under the drive of capillary force, and replaces the crude oil in the formation. Tight sandstone reservoirs have small porous media, and some pore throat radii can reach nanometer level. Spontaneous imbibition displacement with capillary force as the main displacement force has a positive role in improving the recovery of tight sandstone reservoirs. In the process of spontaneous imbibition, the imbibition velocity is an important factor affecting the oil displacement efficiency. Quantitative evaluation of the imbibition velocity in different imbibition stages is of great importance for...

Claims

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