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A Method for Obtaining Relative Permeability Curves of Chemical Systems by Standardizing Isoosmotic Point Variables

A relative permeability and variable technology, which is applied in the field of obtaining the unsteady state relative permeability curve of a chemical system by the variable of the seepage point, can solve problems such as difficulty, complicated operation, and large error, so as to improve accuracy, reduce error influence, reduce The effect of experimental workload

Active Publication Date: 2022-03-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for quickly and accurately obtaining the relative permeability curve of the chemical system, which is the method of the present invention, aiming at problems such as large errors, complex operation, and high difficulty in existing chemical system relative permeability curve determination methods. A method for obtaining unsteady-state relative permeability curves of chemical systems using standardized isotonic point variables

Method used

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  • A Method for Obtaining Relative Permeability Curves of Chemical Systems by Standardizing Isoosmotic Point Variables
  • A Method for Obtaining Relative Permeability Curves of Chemical Systems by Standardizing Isoosmotic Point Variables
  • A Method for Obtaining Relative Permeability Curves of Chemical Systems by Standardizing Isoosmotic Point Variables

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Embodiment 1

[0022] A method for standardizing the isotonic point variable to obtain the unsteady-state relative permeability curve of a chemical system, comprising the following steps:

[0023] Using brine with a salinity of 9374.12 mg / L (see Table 1 for the ionic composition) and diesel with a viscosity of 3.6 mPa·s, the relative permeability curve was measured according to the JBN method, and the oil content, water saturation and oil content were obtained. The phase relative permeability is shown in Table 2 below.

[0024] Table 1. Composition of injected brine

[0025] ion type Na + 、K +

Ca 2+

Mg 2+

CO 3 2-

HCO 3 -

SO 4 2-

Cl -

TDS Contentmg / L 3091.96 276.17 158.68 14.21 311.48 85.29 5436.34 9374.12

[0026] Table 2. Oil / water displacement data

[0027]

[0028] Taking the water saturation Sw as the abscissa and ln((fo) / (1-fo) as the ordinate, make ln((fo 1 ) / (1-fo 1 )), ln((fo 2 ) / (1-fo 2 ))···ln((fo...

Embodiment 2

[0033]A method for standardizing the isotonic point variable to obtain the unsteady-state relative permeability curve of a chemical system, comprising the following steps:

[0034] Using polymer AP-P4 with a concentration of 1750mg / L, a viscosity of 42mPa·s, and crude oil with a viscosity of 70mPa·s, the relative permeability curve was measured, and the oil content, water saturation and relative permeability of the oil phase were obtained as follows Table 3 shows.

[0035] Table 3. Oil / polymer displacement data

[0036]

[0037]

[0038] Taking the water saturation Sw as the abscissa and ln((fo) / (1-fo) as the ordinate, make ln((fo 1 ) / (1-fo 1 )), ln((fo 2 ) / (1-fo 2 ))···ln((fo m ) / (1-fo m )) and water saturation Sw 1 、Sw 2 ···Sw m The relationship graph, such as image 3 shown. It can be obtained from the figure that the slope B=9.9558.

[0039] By assuming the water saturation of the isotonic point, the relative permeability index n of the water phase is obt...

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Abstract

The invention discloses a method for standardizing the isotonic point variable to obtain the relative permeability curve of a chemical system, which includes the following steps: S1, using the oil content to make ln((fo) / (1-fo)) and water saturation Sw Relational curve, obtain the slope B of the straight line; S2, assuming that the water saturation of the isotonic point is Sw x , x takes 1, 2,...k to obtain the relative permeability index n of the water phase in the Corey model x ; S3, using the Corey model to calculate the water saturation Sw x The water phase relative permeability Krw(Sw x‑1 ), Krw(Sw x+1 ) and oil phase relative permeability Kro(Sw x‑1 ), Kro(Sw x+1 ), the calculated isotonic point Sw x when B x ; S4, for isotonic point water saturation Sw x , x takes values ​​1, 2, ... k in turn, repeat steps S2~S3, and obtain B 1 , B 2 ,...,B k value; all B values ​​are equal to or closest to the slope B value in step S1, and the corresponding water saturation is the actual isotonic point water saturation, and the water phase relative permeability curve is further obtained.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for obtaining unsteady-state relative permeability curves of chemical systems by standardizing isotonic point variables. Background technique [0002] In the process of oilfield development, the relative permeability curve, as an important reservoir data, plays an important role in reflecting the characteristics of fluid seepage and designing reservoir development schemes. The relative permeability curve is usually measured and calculated by indoor experiments. According to the national standard GB / T 28912-2012 "Measurement Method for Relative Permeability of Two-phase Fluids in Rocks", indoor measurement experiments are divided into steady-state method and unsteady-state method , where the steady-state method takes too long, and the unsteady-state method is more used in indoor determination experiments. However, for chemical systems, such as polym...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G06F30/20
CPCE21B49/00G06F30/20
Inventor 施雷庭汪士凯叶仲斌王晓张玉龙朱珊珊
Owner SOUTHWEST PETROLEUM UNIV