Device for measuring dynamic leak-off of foam fracturing fluid and working method thereof

Abstract

The invention relates to a device for measuring dynamic leak-off of a foam fracturing fluid and a working method thereof. The device comprises an intermediate container which is arranged in a constant temperature box and used for containing standard saline water, an intermediate container for containing nitrogen gas, an intermediate container for containing the fracturing fluid and a core holder sleeve in which a columnar core is contained, wherein a simulative fissure is arranged at the inlet end of the core holder sleeve; a fluid inlet is arranged at one end of the simulative fissure while the other end of the simulative fissure is communicated with a fluid outlet through a back-pressure valve; one sidewall of the simulative fissure is connected with a plug while the other sidewall of the simulative fissure is connected with the end face of the columnar core; and the other end face of the columnar core is connected with a leak-off pipe through cushion blocks and movable nuts 8-6. As the novel core holder sleeve is utilized to test and measure the columnar core, the device for measuring the dynamic leak-off of the foam fracturing fluid, disclosed by the invention, has the advantages of keeping gas and liquid completeness of the foam fracturing fluid in a leak-off test and calculating a fluid leak-off coefficient and a gas leak-off coefficient in the foam fracturing fluid exactly based on the test data.

Description

technical field [0001] The invention relates to a device for measuring dynamic fluid loss of foam fracturing fluid and a working method thereof, belonging to the technical field of petrochemical industry. technical background [0002] Foam fracturing fluid has strong sand-carrying ability, low filtration loss, fast reverse drainage, and little damage to the formation. It has various characteristics such as viscosity reduction, anti-swelling, resistance reduction, and drainage assistance. It is suitable for low pressure, low permeability, tightness, and water sensitivity. Strong and other complex formations. Foam fracturing fluid has been developed for decades abroad, but in China it is more limited to the indoor research stage, and the performance test of foam fracturing fluid is based on the standard of water-based fracturing fluid performance test However, because the foam fracturing fluid has two phases of gas and liquid, the fracturing fluid fluid loss includes not only...

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Problems solved by technology

Injecting the fracturing fluid into the core holder first and then pressurizing it is possible since water-based fracturing fluids have little compressibility, but for foam fracturing fluids the gas is highly compressible , the foam quality of the foam fracturing fluid changes after the pressure is increased, this method is no longer applicable, as mentioned in the Chinese literature "Applied Chemical Industry" 2011 No. 10 in the article "Research on the Performance of Nitrogen Foam Fracturing Fluid Used in Coalbed Gas Wells" , is to prepare the foam fracturing fluid and put it into the high-temperature and high-pressure filter loss instrument, and add nitrogen to the specified pressure. Although the foam fracturing fluid is not compressed in this way, pressurizing the foam fracturing fluid with nitrogen can also make the foam of the foam fracturing fluid The quality changes, making the measurement results inaccurate, and the experimental results only obtain the liquid fluid loss in the foam fracturing fluid. The above experimental method is the static fluid loss test method of the foam fracturing fluid

At present, there is no mention of any method for measuring dynamic fluid loss of foam fracturing fluid in domestic and foreign references

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