Multiphase System Drilling Fluid Mixer

Abstract

The invention relates to a multi-phase system drilling fluid mixer, comprising: a cabin body, a seawater inlet, a base slurry inlet, an additive inlet, and a mixed fluid outlet; the additive inlet and the mixed fluid outlet are respectively connected to two ends of the cabin body; The slurry inlet is located at the end of the cabin close to the additive inlet and separated on both sides of the cabin; there is a seawater nozzle between the cabin and the seawater inlet, a base slurry nozzle between the cabin and the base slurry inlet, and a diversion structure between the cabin and the additive inlet The seawater nozzle and the base slurry nozzle are all arranged eccentrically with the cabin body; the seawater inlet, the base slurry inlet and the additive inlet bring seawater, base slurry and additives into the cabin through the nozzles for mixing; the mixed liquid is discharged through the outlet. Compared with the prior art, the multi-phase system drilling fluid mixer can accelerate the fluid to increase turbulence, and the twist can make the fluid form a primary vortex and increase the shear contact area, which is more conducive to mixing.

Description

technical field [0001] The invention belongs to the technical field of drilling, and in particular relates to a multiphase system drilling fluid mixer. Background technique [0002] In deep-water surface drilling, shallow currents and shallow gas often lurk in the deep-water seabed. The geological age of the shallow seabed strata is young, and the compaction time is short, resulting in a narrow safe density window and generally high formation permeability. Drilling fluid balanced drilling is currently a mature drilling technology in the world. In deep water drilling, balanced drilling technology uses the static pressure of seawater and drilling fluid to balance the underlying pressure to ensure normal drilling. The drilling fluid used in deepwater drilling is prepared by dynamic mixing and adjustment, that is, the prepared base slurry (heavy drilling fluid), seawater and additives are dynamically mixed at any time according to drilling requirements, and the density of the d...

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Problems solved by technology

[0003] The existing mixer has problems such as complex structure, large volume, and difficult installation

Moreover, the high-speed fluid ejected from the nozzle will produce inelastic collision in the cabin, especially when the inlet flow rate of the two-phase fluid is close, the collision of the two-phase fluid will form a radial flow, which will directly flow out of the mixer, and the collision will also cause the loss of momentum of the high-speed fluid. The high-speed and low-speed shear is an important factor for mixing, and the loss of momentum will also affect the efficiency of mixing, which cannot ensure uniform mixing under various displacements, mixing ratios and three-phase fluid mixing

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