High-temperature high-pressure three-phase fluid dynamic rheometer and method

Abstract

The invention discloses a high-temperature and high-pressure three-phase fluid dynamic rheometer and a method. The rheometer comprises a high-pressure gas cylinder, a high-temperature and high-pressure magnetic stirring kettle, a loop, two high-pressure piston driving tanks, a high-pressure water tank, a high-pressure plunger pump and an open water bucket. The high-pressure gas cylinder, a pressure reducing valve, a flow meter and a one-way valve form a gas injection system; the high-pressure plunger pump is used for circularly pumping water between the two high-pressure piston driving tanks such that pistons are pushed to circularly and alternately move to push measurement fluid to flow, the high-pressure plunger pump is not in contact with the measurement fluid, namely, shear failure isavoided, and the homodromy of the measurement fluid during circular flowing is guaranteed through the connection condition between electric valve conversion pipelines; the pressure of the high-pressure piston driving tanks and the loop is adjusted through a back pressure valve of the high-pressure water tank, the temperature of the whole system is controlled through a constant-temperature air bath, and the rheometer is suitable for multi-working-condition operation. High-pressure observation windows are led out of an initial end and a tail end of the loop, the high-speed microscopic camera shooting is used for carrying out microscopic shooting on the particle size and distribution of bubbles in the windows, and accuracy is higher than that of a common rheometer.

Description

technical field [0001] The invention relates to a three-phase high-pressure dynamic rheometer and a method, which are used for realizing dynamic real-time measurement of oil, gas and water three-phase under high temperature and high pressure. Background technique [0002] At present, with the deepening of domestic oil and gas field exploration and production, the number of deep wells and ultra-deep wells continues to increase, and the downhole temperature and pressure are high. Therefore, it is extremely important to be able to measure the rheology of crude oil at high temperature and high pressure. For ordinary rheometers, it is impossible to perform accurate rheological measurements on high-temperature and high-pressure fluids. [0003] At the same time, it is of great significance to increase the development of heavy oil fields to make up for the shortage of crude oil production. There are many ways to recover heavy oil, but all of them have certain limitations. In cont...

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Problems solved by technology

The shape, quantity, and size of microbubbles in dissolved air crude oil will affect the viscosity of crude oil. According to research on the rheological properties of dissolved air crude oil at home and abroad, rheological measurement is mostly limited to static tests of rheometers, and it is impossible to study gathering and transportation. The real flow state of the fluid in the pipeline, and the shearing effect of the ordinary rheometer on the dissolved crude oil will destroy the original shape and quantity of the microbubbles, which will have a great impact on the experimental results

At the same time, it is of great significance to study the microscopic morphology of crude oil itself and bubbles on the impact mechanism, but high-pressure rheometers are sealed instruments, and most of them cannot conduct real-time observation during the measurement process.

The existing approximate scheme, such as a loop test device for testing dissolved gas crude oil, is the result of the inventor's early research. However, this scheme still has the problem of being unable to measure the three-phase fluid due to the absence of a sample preparation device.

[0005] To sum up, the existing rheometers cannot truly simulate the flow conditions in the gathering and transportation pipelines, and the measurement results are highly controversial and have large errors

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