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Method and system for calculating saturation of residual oil corresponding to water flooding level water flooding layer

A technology of saturation and water-flooded layers, which is applied in earthwork drilling, design optimization/simulation, and special data processing applications, etc. It can solve the problems of not considering the dynamic mixing characteristics of injected water and original formation water, and the large difference in water-flooding mechanism.

Active Publication Date: 2020-10-27
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0012] However, this type of model is based on the premise that the injected water is completely mixed with the original formation water, which is quite different from the real water flooding mechanism, and is only suitable for high water flooding in the later stage of water flooding.
[0013] It can be seen that the above three types of models do not consider the dynamic mixing characteristics of injected water and undisturbed formation water at different water flooding stages, and the above three types of models are only suitable for the interpretation of water flooded layers in specific water flooding stages

Method used

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  • Method and system for calculating saturation of residual oil corresponding to water flooding level water flooding layer
  • Method and system for calculating saturation of residual oil corresponding to water flooding level water flooding layer
  • Method and system for calculating saturation of residual oil corresponding to water flooding level water flooding layer

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Embodiment

[0100] In order to verify the accuracy of the remaining oil saturation calculation method, the water-flooded wells in the study area were processed and interpreted, and the processing parameters used were as follows:

[0101] Rock electricity parameter a=1.008, b=1.013, oil viscosity μ o =4.3mPa·s, the viscosity of water μ w =0.752mPa·s, undisturbed formation water resistivity R w =0.08Ω·m, injected water resistivity R wj =4.8Ω·m, ion exchange rate x=0.8.

[0102] See the diagram of processing and interpretation results Figure 5 ,Depend on Figure 5 It can be seen that:

[0103] The first track is a series of lithology logging tracks. This well contains natural gamma ray, spontaneous potential, and borehole diameter curves;

[0104] The second track is a series of porosity logging, this well contains acoustic logging and density logging curves;

[0105] The third track is the resistivity logging series. This well contains two resistivity curves: deep lateral and front ...

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Abstract

The invention discloses a method and a system for calculating the saturation of residual oil corresponding to a water flooding level water flooding layer. According to the method, ion exchange rate parameters are introduced according to different ion exchange amounts of injection water at different water injection stages and undisturbed formation water; and meanwhile, the water saturation, water yield, oil phase relative permeability and water phase relative permeability at different moments are calculated from initial conditions, and a new water flooding layer interpretation model is deducedand can adapt to the residual oil saturation calculation of water flooding layers of different water flooding levels. By means of the method and the system, the problem of residual oil saturation evaluation at different water flooding levels can be solved, the residual oil saturation can be accurately calculated, and scientific basis is provided for oil field development scheme adjusting, water control and oil stabilizing, as well as old well excavation. The method and the system have high popularization value and economic benefit.

Description

【Technical field】 [0001] The invention belongs to the field of oilfield development, and in particular relates to a method and system for calculating the remaining oil saturation corresponding to a water-flooded layer of a water-flooded level. 【Background technique】 [0002] With the continuous development of oil and gas, many oil fields have entered the middle and late stages of development, and the water flooding of reservoirs is relatively serious. Although a large amount of oil resources have been produced, there are still a considerable amount of remaining oil resources that have not been produced, and the recovery rate is low. The core of water-flooded layer interpretation and evaluation is to determine the remaining oil saturation after water-flooding. Accurate calculation of remaining oil saturation can provide technical support for adjustment of oilfield development plan, water control and oil stabilization, and potential tapping of old wells. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00G06F30/20
CPCE21B49/00E21B47/00G06F30/20Y02A10/40
Inventor 刘行军张海涛文晓峰李高仁赵保华屈亚龙王自亮席辉
Owner BC P INC CHINA NAT PETROLEUM CORP
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