Rotary Distributor for Pressure Multiplier

Abstract

The invention provides 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.

Description

FIELD OF THE INVENTION [0001]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.DESCRIPTION OF THE PRIOR ART[0002]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 reach...

AI Technical Summary

Benefits of technology

[0003]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.

[0005]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.

Problems solved by technology

However such a pressure multiplier from prior art has some drawback.

Images