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Measurement and calculation method for effective viscosity of VES (viscoelastic surfactant) variable-viscosity acid in porous medium

A technology of effective viscosity and porous media, applied in measurement devices, flow characteristics, instruments, etc., can solve the problem that the effective viscosity of porous media cannot be represented, and the viscosity cannot be used for simulation calculation and evaluation of steering effect or filtration reduction effect.

Active Publication Date: 2013-08-28
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

At present, the rheometer (a general instrument for liquid viscosity testing) is used to measure the viscosity of viscous acid. The viscosity is the viscosity under macroscopic shear conditions, which cannot represent the effective viscosity in porous media. The viscosity measured by this method cannot be used for simulation calculations and Evaluation of diversion effect or fluid loss reduction effect under formation conditions

Method used

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  • Measurement and calculation method for effective viscosity of VES (viscoelastic surfactant) variable-viscosity acid in porous medium
  • Measurement and calculation method for effective viscosity of VES (viscoelastic surfactant) variable-viscosity acid in porous medium
  • Measurement and calculation method for effective viscosity of VES (viscoelastic surfactant) variable-viscosity acid in porous medium

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Embodiment

[0039] This example provides a method for measuring and calculating the effective viscosity of VES viscosified acid in porous media. In this example, VES viscous acid with an HCl concentration of 20wt% is used. The method includes the following steps:

[0040] 1. Prepare four different artificial rock cores and measure their porosity, the specific values ​​are as shown in Table 5;

[0041] 2. Use standard brine to carry out displacement experiments on the prepared artificial core, and measure the permeability of the artificial core. The specific values ​​are shown in Table 5;

[0042] 3. Determine the relationship curve between the viscosity of VES viscous acid and shear rate, pH value, VES concentration, and cation (calcium ion) concentration:

[0043] (1) Determine the relationship between the viscosity of VES viscous acid residual acid and the shear rate and establish a curve: the concentration of HCl is 20wt%, HCl and CaCO 3 The molar ratio is 2:1, the test temperature is ...

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Abstract

The invention relates to a measurement and calculation method for the effective viscosity of VES (viscoelastic surfactant) variable-viscosity acid in a porous medium. The method comprises the following steps of: testing the influence of a pH value, the cation concentration, the VES concentration and a shearing rate on the viscosity of the VES variable-viscosity acid by a rheometer; then testing the effective viscosity of the VES variable-viscosity acid in the porous medium by an artificial rock core with a more uniform particle size; building a shearing rate calculation formula in the porous medium by comparing the effective viscosity with the viscosity tested by the rheometer; and building a viscosity calculation formula of the VES variable-viscosity acid based on a relation between the pH value, the cation concentration, the VES concentration as well as the shearing rate and the viscosity of the VES acidic liquid. According to the method for measuring the effective viscosity of the VES variable-viscosity acid in the porous viscosity under a formation condition, a reliable basis is supplied to evaluation of a VES variable-viscosity acid diversion effect and a filtration reduction effect; and the problem that the effective viscosity of the VES variable-viscosity acid under the formation condition and the calculation method cannot be obtained in the prior art is solved.

Description

technical field [0001] The invention relates to a method for measuring and calculating the effective viscosity of VES viscous acid in porous media, and belongs to the technical field of petroleum exploitation. Background technique [0002] In the field of petroleum engineering, VES (viscoelastic surfactant) viscous acid is used for acidification diversion or acid pressure drop and fluid loss. Fresh acid has a low viscosity and becomes viscous after reacting with carbonate rock. The viscosity after becoming viscous is determined Its steering effect or filtering effect. Since acidification and acid fracturing act on the porous medium of the formation, it is necessary to measure the effective viscosity of viscous acid in the porous medium of the formation. At present, the rheometer (a general instrument for liquid viscosity testing) is used to measure the viscosity of viscous acid. The viscosity is the viscosity under macroscopic shear conditions, which cannot represent the ef...

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Application Information

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IPC IPC(8): G01N11/00
Inventor 牟建业柳明王雷张士诚
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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