Method for determining residual oil saturation of non-uniform water flooded layer

A determination method and technology of water-flooded zone, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problem of small remaining oil saturation in water-flooded zone, failure to consider the non-uniformity of water-flooded degree of water-flooded zone, The actual situation of the reservoir is quite different, etc.

Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the non-uniformity of the degree of water flooding in the water-flooded zone, which makes the determined remaining oil saturation of the water-flooded zone too small in the process of determini

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  • Method for determining residual oil saturation of non-uniform water flooded layer
  • Method for determining residual oil saturation of non-uniform water flooded layer
  • Method for determining residual oil saturation of non-uniform water flooded layer

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Embodiment Construction

[0018] In the process of using production profile data to determine the remaining oil saturation of non-uniform water-flooded formations, the degree of water-flooding in different parts of the water-flooded formations is non-uniform, and the remaining oil saturation of water-flooded formations obtained by existing methods often only reflects strong The remaining oil saturation of the water-flooded part, in order to accurately obtain the remaining oil saturation of the non-uniform water-flooded layer, the present invention proposes a method for determining the remaining oil saturation of the non-uniform water-flooded layer.

[0019] The Wendong Oilfield in the Dongpu Sag is a typical high-temperature, high-pressure, high-salt and low-permeability reservoir. The development plan of old areas has been adjusted, and new wells are less and less. The use of open hole data to determine the remaining oil saturation is also limited. The present invention will be further described in det...

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Abstract

The invention provides a method for determining residual oil saturation of a non-uniform water flooded layer, and belongs to the technical field of geophysical logging evaluation of reservoir saturation. A non-uniform water flooded layer saturation equivalent model diagram is established by an equivalent area method, and a method for determining residual oil saturation by production profile data is corrected to obtain the method for determining the residual oil saturation of the non-uniform water flooded layer; the obtained residual oil saturation of the non-uniform water flooded layer better reflects the overall residual oil saturation of the water flooded layer, and is more consistent with the actual situation of a reservoir, thus achieving accurate knowledge of the regional residual oil saturation distribution law, and providing a scientific basis for reasonable and efficient development of the reservoir.

Description

technical field [0001] The invention relates to the technical field of evaluating reservoir saturation by geophysical logging, in particular to a method for determining the remaining oil saturation of a non-uniform water-flooded layer. Background technique [0002] The determination of the remaining oil saturation of a single well is the basis for the study of the distribution of the remaining oil in the reservoir during the oilfield development period. The remaining oil saturation monitoring after casing is a method widely used at home and abroad at present, but the saturation detector after casing is not suitable for high temperature, High-pressure reservoirs, while in the old oilfield area, new drilling is limited, and the remaining oil saturation cannot be determined solely by the completion combination logging data. The current solution is to use production profile data to determine remaining oil saturation. [0003] According to the textbook "Principles of Production ...

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Application Information

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IPC IPC(8): E21B49/08
Inventor 任杰毕建霞陈彬赵伟新韩圆庆赵真
Owner CHINA PETROLEUM & CHEM CORP
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