Device and method for evaluating foaming performances of foaming agent under conditions of high temperature and high pressure

Abstract

The invention relates to a device and a method for evaluating foaming performances of a foaming agent under conditions of a high temperature and high pressure. A technical scheme of the invention comprises taking a certain amount of a foaming agent solution, filling gas into a container from a gas inlet located at the bottom of the container so that foam is produced by a gas flow method, stopping gas filling after a preset amount of gas is filled into the container, recording a volume of the foam, wherein the volume characterizes a foaming capacity of the foaming agent solution, starting timing simultaneously, wherein time of production of the foam of which a volume is half of the volume of the foaming agent solution is a foam half-life period and characterizes foam stability, continuously filling gas into the container repeatedly according to a preset flow so that foam is produced continuously, discharging the foam from a back-pressure valve, metering a volume of the foaming agent solution carried by the foam by a metering cylinder at an outlet, stopping gas filling when the total amount of filled gas reaches to a preset amount, and metering a volume of the foaming agent solution carried by the foam, wherein the volume of the foaming agent solution carried by the foam characterizes a liquid carrying capacity of the foam. The device and the method have the advantage that foam is produced by the gas flow method and a gas flow rate and a gas flow amount are controlled and evaluation of a foaming capacity, stability and a liquid carrying capacity of a foaming agent solution under the conditions of a high temperature and high pressure can be realized.

Description

technical field [0001] The invention relates to the field of oil and natural gas exploitation, in particular to a device and method for evaluating the foaming performance of a foaming agent under high temperature and high pressure conditions. Background technique [0002] Foam fluids are widely used in the process of oil and natural gas extraction, and the screening and evaluation of foaming agents is the basis of its application. At present, there are four commonly used methods for foaming agent evaluation: (1) Ross-Miles method or improved Ross-Miles method, the instrument used is called Ross-Miles instrument or Roche foam instrument, this method is used to measure the foaming of surfactants. The national standard recommended method for foam performance, the standard code is GB / T 13173.6-1991. Its principle is to foam by the impact force generated by the downward flow of the surfactant solution at a certain height. Its advantage is that it is easy to operate and can b...

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Problems solved by technology

(4) Resistance factor method, the principle of which is to measure the resistance factor and residual resistance factor of foam seepage through core displacement experiments, which can better reflect the comprehensive performance of the foaming agent in porous media, but cannot obtain the foaming agent’s performance. Foaming ability, stability and other parameters, and the experimental process is complicated, difficult to operate, and the repeatability is not very good

The above four methods are commonly used evaluation methods for foaming agents in the development of oil and natural gas. The first three methods are evaluated under normal pressure conditions, and the fourth method can be carried out under high temperature and high pressure conditions, but the evaluation results are only It has guiding significance for seepage in foam formations, but has little guiding significance for the application of foam in pipelines and wellbore, such as foam drainage and gas production, it is necessary to evaluate the foaming ability, stability and liquid-carrying ability of the foaming agent under high temperature and high pressure conditions , the current evaluation method cannot meet the requirements

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