A high-temperature and high-pressure foam rheological testing system and experimental method

Abstract

The invention relates to a high-temperature high-pressure foam rheological test system and an experiment method. The high-temperature high-pressure foam rheological test system comprises a liquid supply and flow control device, a gas supply and flow control device, a foam preparation device simultaneously connected with the liquid supply and flow control device and the gas supply and flow controldevice, a high-temperature high-pressure rheological measurement unit connected with the foam preparation device, and a back pressure control device connected with the high-temperature high-pressure rheological measurement unit by a high-temperature high-pressure foam performance observation device, wherein a temperature control system is arranged in the foam preparation device. According to the system, accurate control can be carried out at a temperature of an operating environment and under a pressure of the operating environment to prepare foam fluids which are different in gas-liquid ratio, different in pressure and different in temperature; the prepared foam fluids are in seamless connection with the high-temperature high-pressure rheological measurement unit so as to ensure that foamresearched by the rheological test is a foam system in the operating environment.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a high-temperature and high-pressure foam rheological testing system and an experimental method. Background technique [0002] Foam fluid is a dispersion system in which gas is the dispersed phase, and the dispersion medium can be either a solid phase or a liquid phase. The former is called solid foam, such as foam cement; the latter is called liquid foam, which is commonly referred to as foam, such as fire extinguishing foam, flotation foam, drilling foam, etc. The unique structure of the foam fluid determines that the foam has advantages such as low frictional resistance, low density, low filtration loss, strong flowback capacity, strong ability to carry solid particles, and little damage to the reservoir, and the foam has a sealing effect on the high permeability layer. It has the effect of increasing the swept volume of the low-permeability layer, ...

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Problems solved by technology

However, since the rheology of foam is affected by many variable factors, the rheology of foam at normal temperature and pressure is very different from that of foam at high temperature and high pressure, and even the law is opposite.

At present, experts and scholars engaged in the research of high-temperature and high-pressure foam rheology are rare. Only a few large foreign companies have done some work on the research of complex foam rheology testing instruments that consider temperature and pressure parameters, such as Halliburton, Schlumberger and others have carried out rheology and compressibility measurements, but there are still many problems in their experimental devices and test methods

Domestic high-temperature and high-pressure foam rheology test devices are mostly used in the pipe flow research of drilling fluid and fracturing fluid foam. The choice of pipe diameter and flow velocity equation has a great influence on the difference in the results of the rheological equation, and the impact results cannot be evaluated.

In addition, some researchers used the prepared foam to test its rheological properties in a commercial high-temperature and high-pressure rheometer. Although the pressure and temperature can be close to the operating environment, the prepared foam is not produced under the pressure of the operating environment. The foam quality of the test foam cannot be controlled, or the foam quality controlled is not the foam quality in the working environment, resulting in a large difference between the rheological properties tested and the foam properties under actual application conditions

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