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Oil reservoir state prediction method considering non-equilibrium anisotropy relative permeability

A technology of relative permeability and anisotropy, which is applied in the field of reservoir development, can solve problems such as pressure propagation errors in remaining oil saturation changes, reservoir pressure distribution and remaining oil distribution are not accurate enough, and achieve accurate prediction results

Active Publication Date: 2020-08-25
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing oil-water two-phase numerical simulation methods use isotropic relative permeability curves, ignoring the influence of production rate and displacement direction on relative permeability, resulting in errors in pressure propagation and remaining oil saturation changes. The reservoir pressure distribution and remaining oil distribution predicted by the method are not accurate enough

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  • Oil reservoir state prediction method considering non-equilibrium anisotropy relative permeability
  • Oil reservoir state prediction method considering non-equilibrium anisotropy relative permeability
  • Oil reservoir state prediction method considering non-equilibrium anisotropy relative permeability

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Embodiment 1

[0025] figure 1 It is a flow chart of Embodiment 1 of the reservoir state prediction method considering non-equilibrium anisotropic relative permeability of the present invention. see figure 1 , the reservoir state prediction method considering non-equilibrium anisotropic relative permeability includes:

[0026] Step 101: Carry out grid area division on the three-dimensional geological model to obtain well parameters and initial attribute parameters of each grid area; the well parameters include well point position, production rate, production pressure and production time; the initial attribute parameters Including initial pressure, initial fluid velocity and initial water saturation; the initial fluid velocity of one of the two adjacent grid areas is based on the initial pressure difference between the two adjacent grid areas and the The initial fluid velocity in another grid area is calculated; the three-dimensional geological model is obtained by geological modeling of th...

Embodiment 2

[0044] figure 2 This is the overall flow chart of Embodiment 2 of the reservoir state prediction method considering non-equilibrium anisotropic relative permeability of the present invention. see figure 2 , the reservoir state prediction method considering non-equilibrium anisotropic relative permeability includes:

[0045] 1. Taking typical fluvial reservoirs as the research object, a 30cm*30cm*30cm sample with trough-shaped and plate-shaped cross-bedding was selected from the outcrop in the field, and core columns were drilled from three directions of X, Y, and Z, as shown in image 3 as shown, image 3 It is the plate cross bedding characteristics and sampling direction diagram of typical fluvial reservoir field outcrop.

[0046] The X-direction core column, the Y-direction core column and the Z-direction core column obtained by drilling in the X, Y, and Z directions were subjected to displacement experiments using the existing unsteady-state oil-water two-phase relati...

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Abstract

The invention relates to an oil reservoir state prediction method considering non-equilibrium anisotropy relative permeability. The method comprises the steps that the initial pressure and the initialfluid flow velocity of a first grid area are updated according to the production pressure and the production speed; the initial pressure and the initial fluid flow velocity of the remaining grid areas are sequentially updated with the first grid area as the center; relative permeability in X, Y and Z directions are determined according to the initial water saturation of each grid region and the updated initial fluid flow rate, and updating the initial water saturation; according to the relative permeability of each grid region in the X, Y and Z directions and the updated initial pressure, initial fluid flow rate and initial water saturation, pressure, fluid flow rate and water saturation of each grid region at the next moment are acquired; and circularly the production time, and obtainingthe oil reservoir and pressure distribution condition are calculated in the fluvial facies reservoir according to the water saturation and pressure time-varying graph. The method can accurately predict oil reservoir pressure distribution and residual oil distribution.

Description

technical field [0001] The invention relates to the technical field of oil reservoir development, in particular to a method for predicting oil reservoir state considering non-equilibrium anisotropic relative permeability. Background technique [0002] In the process of reservoir development, oil-water two-phase numerical simulation method is usually used to predict reservoir state. The existing oil-water two-phase numerical simulation methods simply normalize the laboratory test results when applying relative permeability, and finally use a relative permeability curve in the entire numerical simulation process, that is, isotropic relative permeability rate, independent of direction and independent of velocity. Taking typical fluvial reservoirs as an example, in the process of oilfield development, when the injection-production direction is along the river and perpendicular to the river, due to the difference in the pore structure in the two directions, the seepage law of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06T17/05G06Q10/04G06Q50/02E21B49/00E21B47/06G06F111/10
CPCG06F30/20G06T17/05G06Q10/04G06Q50/02E21B49/00E21B47/06G06F2111/10Y02A10/40
Inventor 李聪聪王硕亮由庆于春磊王硕桢郑凯鲁轩
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)