Patent ID: 6745838
Filing Date: 2004-06-08
Classification: E21B

Abstract:
A chemical injection system for controlling the distribution of a chemical fluid from a supply conduit into an individual petroleum well in the vicinity of multiple petroleum wells at individually adjustable rates, comprising:a remotely operated two position directional control valve fluidly connected to the supply conduit; a hollow cylinder having a cylinder bore and a first input-output port at one end and a second input-output port at an opposing second end; a fluid barrier within the cylinder bore, such that chemical fluid flows from the supply conduit through said control valve to one end of the cylinder bore and forces the barrier to displace a fixed volume of fluid from the cylinder bore, then through the control valve and to an injection point for the individual petroleum well, each operation of the directional control valve reversing travel direction of the barrier within the cylinder bore; a first damping chamber on one side of the fluid barrier; a second dampening chamber on an opposing side of the fluid barrier; and one or more valve members for restricting flow from at least one of the first and second dampening chambers.