Method for determining oil driving efficiency and sweep coefficient of all layers and positions of heterogeneous reservoir stratum

A technology for heterogeneous reservoirs and oil displacement efficiency, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc. Validated, low accuracy, etc.

Active Publication Date: 2014-10-08
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Due to the complexity of heterogeneous reservoir structure and the diversity of factors affecting the sweep coefficient, the oil displacement efficiency and sweep coefficient determined by the above methods have the defect of low accuracy, and the establishment of three-dimensional heterogeneou

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  • Method for determining oil driving efficiency and sweep coefficient of all layers and positions of heterogeneous reservoir stratum
  • Method for determining oil driving efficiency and sweep coefficient of all layers and positions of heterogeneous reservoir stratum
  • Method for determining oil driving efficiency and sweep coefficient of all layers and positions of heterogeneous reservoir stratum

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Embodiment

[0129] Embodiment: Taking a large-scale heterogeneous model of an oil field as an example, the method of the present invention is used to determine the oil displacement efficiency and sweep coefficient of different layers and positions, including the following steps:

[0130] 1) Preparation of heterogeneous reservoir large model, core calibration parallel samples and electrode core calibration parallel samples

[0131] ① if figure 1 As shown, the size of the heterogeneous reservoir model is: length × width × height = 60cm × 60cm × 4.5cm, which is a structure of three layers of equal height, and the permeability of each layer is different. , which are divided into high-permeability layer, medium-permeability layer and low-permeability layer from bottom to top to simulate positive rhythm sedimentary strata. The parameters of the large heterogeneous reservoir model are shown in Table 1.

[0132] ② if figure 2 As shown, three kinds of core calibration parallel samples with the ...

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Abstract

The invention relates to a method for determining oil driving efficiency and sweep coefficients of all layers and positions of a heterogeneous reservoir stratum. The method includes the following steps of firstly, establishing an oil driving efficiency and sweep coefficient mathematical model; secondly, manufacturing a heterogeneous reservoir stratum large model, a core calibration parallel sample and an electrode core calibration parallel sample; thirdly, measuring parameters of the core calibration parallel sample and parameters of the electrode core calibration parallel sample; fourthly, solving the oil driving efficiency and the sweep coefficients of the different layers and the different positions of the heterogeneous reservoir stratum large model and the total oil driving efficiency and the total sweep coefficient of all the layers. When the oil driving efficiency calculated according to the method is low, the oil driving efficiency can be improved by replacing chemical agents or increasing the concentration of the chemical agents. When the sweep coefficients are low, the sweep coefficients can be increased by increasing the generated pressure difference, or the sweep volume can be increased by drilling an infill well. The method provides visual and accurate foundation data for oilmen, and provides reference data for regulating the exploitation scheme of an oil field.

Description

technical field [0001] The invention relates to a method for determining oil displacement efficiency and sweep coefficient in oil field reservoirs, in particular to a method for determining oil displacement efficiency and sweep coefficient for different layers and positions of heterogeneous reservoirs. Background technique [0002] The displacement efficiency refers to the ratio of the amount of oil displaced by the displacement agent to the total oil content within the displacement range, and the sweep coefficient refers to the ratio of the volume of the oil layer swept by the displacement agent to the total volume of the oil-bearing reservoir. Oil displacement efficiency and sweep coefficient are key factors affecting oil recovery. Generally speaking, the higher the oil displacement efficiency and the greater the sweep coefficient, the greater the recovery factor. At present, there are many methods for determining oil displacement efficiency and sweep coefficient. The rese...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 宋考平张健皮彦夫唐恩高李强李保振杨二龙刘丽苏旭
Owner CHINA NAT OFFSHORE OIL CORP
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