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Characterization method of nonlinear seepage characteristics of single-phase fluid through low-permeability core

A low-permeability, nonlinear technology, applied in the field of characterization of nonlinear seepage characteristics, can solve the problems of not being able to simultaneously characterize fluid starting pressure gradient and nonlinear flow characteristics, unclear physical meaning of model parameters, and difficulty in obtaining parameters

Active Publication Date: 2019-12-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, there are still many problems in the above-mentioned nonlinear seepage characterization methods, such as unclear physical meaning of model parameters, difficulty in obtaining parameters, etc.; however, the most important problem is that the existing characterization methods cannot simultaneously characterize fluid flow through low-permeability cores. The threshold pressure gradient and nonlinear flow characteristics of

Method used

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  • Characterization method of nonlinear seepage characteristics of single-phase fluid through low-permeability core
  • Characterization method of nonlinear seepage characteristics of single-phase fluid through low-permeability core
  • Characterization method of nonlinear seepage characteristics of single-phase fluid through low-permeability core

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In step 1, the conventional basic parameters of the core used in the experiment: the core length is 52mm, the diameter is 25mm, the porosity is 0.09, and the permeability is 1.5mD.

[0031] In step 2, the simulated oil parameters for the experiment: the simulated viscosity is 2mPa / s, and the volume coefficient is 1.1.

[0032] In step 3, the static method is used to measure and simulate the minimum starting pressure gradient through the low permeability core as 0.006MPa / m.

[0033] In step 4, use the multifunctional core displacement device to measure the steady-state pressure gradient-flow relationship, and draw the relationship curve between the displacement pressure gradient and the flow rate.

[0034] In step 5, the conventional core parameters and fluid parameters obtained in steps 1-3 are brought into the following formula, and the formula is applied to fit the displacement pressure gradient-flow rate relationship curve in step 4. The fitting formula used is

[0035] Q=0.0...

Embodiment 2

[0039] In step 1, the conventional basic parameters of the core used in the experiment: the core length is 69mm, the diameter is 25mm, the porosity is 0.15, and the permeability is 2mD.

[0040] In step 2, the simulated oil parameters for the experiment: the simulated viscosity is 2mPa / s, and the volume coefficient is 1.1.

[0041] In step 3, the static method is used to measure and simulate the minimum starting pressure gradient through the low permeability core as 0.002MPa / m.

[0042] In step 4, use the multifunctional core displacement device to measure the steady-state pressure gradient-flow relationship, and draw the relationship curve between the displacement pressure gradient and the flow rate.

[0043] In step 5, the conventional core parameters and fluid parameters obtained in steps 1-3 are brought into the following formula, and the formula is applied to fit the displacement pressure gradient-flow rate relationship curve in step 4. The fitting formula used is

[0044] Q=0.000...

Embodiment 3

[0048] In step 1, the conventional basic parameters of the core used in the experiment: the core length is 127mm, the diameter is 25mm, the porosity is 0.11, and the permeability is 8.25mD.

[0049] In step 2, the simulated oil parameters for the experiment: the simulated viscosity is 2mPa / s, and the volume coefficient is 1.1.

[0050] In step 3, the static method is used to measure and simulate the minimum starting pressure gradient through the low permeability core as 0.0016MPa / m.

[0051] In step 4, use the multifunctional core displacement device to measure the steady-state pressure gradient-flow relationship, and draw the relationship curve between the displacement pressure gradient and the flow rate.

[0052] In step 5, the conventional core parameters and fluid parameters obtained in steps 1-3 are brought into the following formula, and the formula is applied to fit the displacement pressure gradient-flow rate relationship curve in step 4. The fitting formula used is

[0053] Q=...

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Abstract

The invention provides a characterization method of non-linear percolation characteristics of a single-phase fluid passing through a low-permeability core. The characterization method of the invention comprises the following steps: Step 1, measuring conventional physical property parameters of the core; Step 2, measuring fluid parameters; Step 3, measuring the minimum starting pressure gradient of the single-phase fluid passing through the low-permeability core according to a static method; Step 4, carrying out an experimental measurement on fluid flow under different displacement pressure gradients, and drawing a relation curve of the displacement pressure gradient and the flow; and Step 5, fitting the relation curve of the displacement pressure gradient and the flow, and obtaining non-linear seepage parameters. The characterization method of non-linear percolation characteristics of a single-phase fluid passing through a low-permeability core provides a reliable research tool for analyzing percolation rules for the oilfield production process and various economic and technical norms and provides a reliable percolation mathematical model for the numerical low-permeability reservoir simulation software development.

Description

Technical field [0001] The invention relates to the technical field of oil field development, and in particular to a method for characterizing the nonlinear seepage characteristics of a single-phase fluid passing through a low-permeability core. Background technique [0002] At present, in my country's proven oil reserves and unused reserves, the reserves of low-permeability oil reservoirs account for a large proportion, and more and more low-permeability oil reservoirs are being developed. Due to the complexity of the pore geometry of low-permeability reservoirs, the particularity of fluid properties and the restriction of flow conditions at the same time, the fluid seepage characteristics in low-permeability reservoirs no longer conform to the traditional Darcy seepage law, and appear obviously non-permeable. Linear seepage characteristics, while having a certain starting pressure gradient. Therefore, there is an urgent need to conduct in-depth analysis of fluid seepage laws i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 苏海波刘显太杨勇张世明汪勇孙红霞孟薇董亚娟张波易红霞赵莹莹侯玉培
Owner CHINA PETROLEUM & CHEM CORP
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