Rotary distributor for pressure multiplier

The present invention broadly relates to well injection for example cementing. More particularly the invention relates to servicing apparatus for pumping fluids in downhole wells into a subterranean reservoir, such as for instance an oil and/or gas reservoir or a water reservoir.

When a cementing job is performed, pumping units are used to pump a fluid downhole in the well. Usually high pressure pumps are needed to ensure efficient pumping. To allow amplification of pressure, for example pressure multiplier can be used. Pressure multipliers are well known in prior art. FIG. 1 shows a schematic representation of a pressure multiplier. When piston 1A extends to the right at a constant speed, piston 1B delivers a constant downstream flow of oil. At the same time piston 1B is moving to the right, piston 2A retracts to the left in conjunction with piston 2B. When piston 1A reaches the right end of the cylinder, piston 2A reaches the left end of its cylinder. Piston 2A then extends while piston 1A retracts. Pistons 1A and 2A have a surface larger than pistons 1B and 2B, in such a way that high pressure comes out of exit 4 when a relatively low pressure (compared to exit 4) comes in via the input 3. However such a pressure multiplier from prior art has some drawback. The motion of the two pistons should produce a constant and uniform flow output, but due to the change of directions of piston 1A and 2A, a dip is generated in the output flow at the downstream of pistons 1B and 2B. Therefore, there is a need to improve the pressure multiplier from prior art.

The invention discloses a system for multiplying pressure comprising at least two hydraulic cylinders communicating with an exit supplying pressure, wherein each cylinder has a piston within a chamber; said pistons cooperating respectively with an associated piston to supply pressure at the exit; and a rotary distributor communicating with said both hydraulic cylinders, able to supply alternatively a fluid to each chamber for motion of the respected pistons and to ensure alternatively return of the pistons. In this way, the rotary distributor ensures an alternative supply of the fluid into the chambers and also an exit of the fluid from the chambers.

Preferably, the rotary distributor is made of a mirror distributor plate able to rotate within a holder, wherein the position of the plate versus the holder determines the supply of the fluid to one chamber and/or to another. The mirror distributor plate rotates clockwise or inverted clockwise and each cycle of the system is determined by sequences in position of the plate versus the holder. In a preferred embodiment, the mirror distributor plate is made of, but not limited to, at least two slots, the first slot ensuring supply of the fluid to each chamber and second slot ensuring return of the fluid from each chamber. By rotation of the plate, each cylinder is alternatively supplied by the fluid and emptied from the fluid, depending if the sequence is respectively a compression or a depression.

Preferably, the system is made of a first rod coupling first piston with third associated piston; a second rod coupling second piston with fourth associated piston; and a first free wheel connected to the first rod and a second free wheel connected to the second rod, said both free wheels coupled with the rotary distributor such that motion of each piston ensures self rotation of the rotary distributor in one direction ensuring alternative supply of each chamber with the fluid. This configuration allows a self driving of the rotary distributor.

In another embodiment, the rotary distributor is rotate by a step motor. In this way, the rotation is independent and controlled preferably with a micro-controller.

Preferably, a first sensor determining position of first or second piston in associated chamber is added. Advantageously, the system comprises two sensors; the first sensor determines position of first piston in first chamber and further comprising a second sensor determining position of second piston in second chamber.

In another aspect of the invention a method for pumping an injection fluid in a well using an apparatus above is disclosed. Preferably, the injection fluid is but not limited to a cement slurry and the system is used in a cementing job. Other fluids can also be pumped, for various applications for example fracturing, stimulation or various well treatments.

The system thanks to its little size can be used in environment where place is limited, for example offshore or on trucks.

Preferably, the system is used for multiplying pressure with a step of pre-compression within each chamber of the cylinder.

BRIEF DESCRIPTION OF THE DRAWINGS

Further embodiments of the present invention can be understood with the appended drawings:

FIG. 1 shows a schematic diagram of a pressure multiplier from prior art.

FIG. 2 shows the apparatus according to the invention comprising a rotary distributor valve.

FIG. 3A shows the rotary distributor in a first position.

FIG. 3B shows the rotary distributor in a second position, respectively turned from an angle of 180° compared to first position.

FIG. 4 shows the sequences of the apparatus according to the invention during function.

Continue reading about Rotary distributor for pressure multiplier...
Full patent description for Rotary distributor for pressure multiplier

Brief Patent Description - Full Patent Description - Patent Application Claims

Click on the above for other options relating to this Rotary distributor for pressure multiplier patent application.
###


How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Rotary distributor for pressure multiplier or other areas of interest.
###


Previous Patent Application:
Linear compressor and the supporter for the same
Next Patent Application:
Compressor assembly comprising a valve unit in the intake region
Industry Class:
Pumps

###

Design/code © 2009 FreshContext LLC/Freshpatents.com. Website Terms and Conditions - Also read: About this Page
Patent data source: patents published by the United States Patent and Trademark Office (USPTO)
Information published here is for research/educational purposes only (and in conjunction with our Keyword Monitor) and is not meant to be used in place of the full USPTO patent document/images or a comprehensive patent archive search. Complete official applications are on file at the USPTO and often contain additional data/images (Freshpatents is currently text-only). FreshPatents.com is not affiliated with or endorsed by the USPTO or firms/individuals or products/designs/ideas related to listed patents.

FreshPatents.com Support
Thank you for viewing the Rotary distributor for pressure multiplier patent info.
IP-related news and info


Results in 1.7738 seconds


Other interesting Feshpatents.com categories:
Daimler Chrysler , DirecTV , Exxonmobil Chemical Company , Goodyear , Intel , Kyocera Wireless , paws