A foam drilling fluid generating device

Abstract

The invention relates to a device for generating foam drilling fluid. The foam drilling fluid generating device specifically includes a foam generating device and a foam mixing device. The foaming chamber of the foam generating device is provided with a stirring rod with a helical stirring blade. The foam generating device is connected with a pressurization system to ensure that the inside of the foaming chamber under high pressure. The mixing device includes a mixing chamber and a mixing rod. The mixing rod has a hollow structure. The mixing rod is provided with helical blades and stirring blades, and small foam outlet holes are designed between the helical blades. The foam gradually enters the mixing chamber from the foam outlet of the foam generating device through the foam outlet hole on the mixing rod of the mixing device, and is evenly mixed with the drilling fluid. Compared with the prior art, the drilling fluid foam produced in the present invention has high foaming ratio, uniform foam shape, good downhole stability and good mixing effect with the drilling fluid base fluid.

Description

technical field [0001] The invention relates to the field of oil exploration and development drilling engineering, in particular to a device for generating foam drilling fluid. Background technique [0002] In drilling engineering, foam drilling fluid is a gas-liquid-solid three-phase system. Due to the existence of foam in foam drilling fluid, the viscosity, dynamic and static shear force, and rock-carrying capacity of foam drilling fluid are higher than those of water-based drilling fluid. . At the same time, compared with water-based drilling fluid, foam drilling fluid also has the characteristics of low hydrostatic column pressure and small leakage, so foam drilling fluid is widely used in exploration and development of low pressure fractured oil and gas reservoirs, heavy oil reservoirs, low pressure and low permeability Oil and gas layers, oil and gas reservoirs with serious leakage and energy depleted oil and gas reservoirs. [0003] In foam drilling fluid, it is nec...

AI Technical Summary

Problems solved by technology

In addition, when the foam and drilling fluid are mixed, due to the large difference in physical properties such as density between the two, the foam is easily broken during the mixing process and has poor stability.

However, the current foam drilling fluid generating device cannot meet the above requirements. Based on this, there is an urgent need for a foam drilling fluid generating device that can solve the above problems

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