Gas and liquid contact apparatus – Contact devices – Injector type
Patent
1991-02-19
1992-08-04
Miles, Tim
Gas and liquid contact apparatus
Contact devices
Injector type
7386102, 366101, 261DIG75, B01F 304
Patent
active
051356848
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a multiphase process mixing and measuring system, more specifically, to a system by which two or more fluid materials, that is, liquids, gases or vapours, are mixed and by which the mixed materials can be metered if desired.
According to the invention, there is provided a method of and an apparatus for mixing at least one fluid with a liquid, in which the liquid flows from a pool through a venturi passage, and the fluid to be mixed with it is introduced into the liquid flow for mixing in the venturi. Mixing or homogenizing is thus effected in that the fluid, which may be a gas or vapour, or a second liquid, is drawn into the venturi passage by the flow through it of the first-mentioned liquid. It may be desired to mix with the liquid more than one fluid, and the inlet pipe can then be constituted by two or more concentric pipes, of which the inner pipe and the space or spaces between it and the or each outer pipe supply a fluid into the venturi.
The invention can thus provide apparatus comprising a vessel or chamber into which a liquid from a first source can be fed to form a pool of liquid, the chamber having a discharge passage having a restriction to form a venturi, into which projects the free end of an inlet pipe for feeding into the venturi a fluid from a second source to be mixed with the liquid.
The invention can be embodied in apparatus for mixing or homogenizing a multi-phase fluid flow. The chamber can thus be a closed chamber, with means communicating between the inlet pipe and the upper region of the chamber, that is, the region above the pool formed by the liquid phase of the multi-phase fluid flow, the upper region constituting the second source and the pool constituting the first. The introduction into the homogenized multiphase flow of one or more fluid additives can again be effected by use of concentric inlet pipes. The flow into the discharge passage can be induced by gravity, the outlet from the chamber being then located in its floor. An apparatus in accordance with the invention can nevertheless be designed to be located directly upstream of a suitable pump or booster.
Preferably, the apparatus incorporates means tending to maintain a level of the liquid in the vessel or chamber. The invention can accordingly provide that the or each inlet pipe conveying fluid into the venturi extends through the pool of the liquid in the chamber and is provided with apertures or perforations. The amount of the liquid drawn off from the liquid pool thus increases as a function of the increase of the liquid level, as more of the perforations are submerged.
An apparatus embodying the invention can moreover be conveniently associated with flow measuring means. Flow meter arrangements of the kind which operate on the pressure drop ensures when a fluid flow through a venturi can be integrated with the apparatus described above by locating pressure sensors at the discharge venturi. By inclusion of a densiometer mass flow rates of a homogenized multi-phase fluid flow can be reliably determined.
The apparatus of the invention can be applied to the homogenization and/or measurement of a mixture of oil, water and gas and can be embodied in a form suitable for subsea use. The invention thus also provides a flowmeter cartridge, which can incorporate a choke, arranged for subsea installation, as by installation in a barrel receptacle connected to a X'mas tree.
It will be evident that the invention has a variety of applications particularly in the oil industry, where it can be applied to chemical injection and blending as well as to on-shore and off-shore handling of crude oil. In its aspect as a homogenizing apparatus, it is applicable in particular to the mixing or homogenization of mixtures of gas and oil extracted from onshore or subsea wells. The fluid extracted from such wells can vary substantially as regards its gas and liquid components. It may comprise slugs of substantially unmixed liquid separated by primarily gaseous portions, as well as portions that are more or less homogene
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Martin Wallace W.
Mohn Frank
Framo Development (UK) Limited
Miles Tim
Norsk Hydro AS
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