Acidifying return stimulation experiment method

A simulation experiment and flowback technology, applied in the field of acidification flowback simulation experiment, can solve the problem of low foam stability, achieve the effect of simple steps and reduce simulation cost

Inactive Publication Date: 2014-06-04
唐静
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  • Abstract
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Problems solved by technology

When the concentration of the surfactant solution exceeds the cmc more, the surface adsorption rate is faster, so it is often found that the foam stability is lower

Method used

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  • Acidifying return stimulation experiment method

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Embodiment

[0031] The invention discloses an acidification flowback simulation experiment method, comprising the following steps:

[0032] (a) First, measure the original permeability of the core;

[0033] (b) Press the flowback liquid into the core under the pressurized condition of the nitrogen cylinder until the flow rate of the solution flowing through the core is stable for a period of time;

[0034] (c) Then seal the end of the core holder and press a certain amount of hydrochloric acid into the core;

[0035] (d) Pressurized acidification, pressure relief, and spray acid solution from the positive end of the core holder;

[0036] (e) Measurement of core permeability after acidification.

[0037] In the step (b), the stabilization time is 3-5 minutes.

[0038] In the step (c), the mass fraction of hydrochloric acid is 15%.

[0039] In the step (d), the experimental temperature is kept at about 60°C.

[0040] In the step (d), the pressure is released after 30 minutes.

[0041] ...

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Abstract

The invention discloses an acidifying return stimulation experiment method. The method comprises the following steps: 1, determining the original permeability of a rock core; 2, pressing a return solution in the rock core under a nitrogen cylinder pressurization condition until the flow of the solution flowing through the rock core is stable, and stabilizing for a period of time; 3, sealing the tail end of a rock core holder, and pressing a certain amount of hydrochloric acid in the rock core; 4, carrying out restrained pressure acidification, relieving the pressure, and spraying the obtained acid solution from the forward end of the rock core holder; and 5, determining the permeability of the acidified rock core. The method enables the acidifying return stimulation experiment to be completed, has simple steps, and substantially reduces the stimulation cost.

Description

technical field [0001] The invention relates to an acidification flowback simulation experiment method. Background technique [0002] Foam is a heterogeneous dispersion system formed by dispersing insoluble (or slightly soluble) gas in liquid or molten solid, in which the liquid is the continuous phase (dispersion medium) and the gas is the discontinuous phase (dispersion phase). The foam has a large surface free energy. After the foam is broken, the total surface area of ​​the system liquid is greatly reduced, that is, the energy is reduced. Therefore, it is a thermodynamically unstable system, but under certain conditions, taking appropriate measures, Can maintain a certain stability. To characterize the state of phases in such mixed systems, the two most commonly used methods are the Kazakov method and the Mitchell method. Kazakov used the value of foam ratio Kf. When Kf﹤3.8, this mixed system is considered to be a gas emulsion in liquid, and when Kf>3.8, it is a sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 唐静
Owner 唐静
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