Patent ID: 8261822
Filing Date: 2012-09-11
Classification: E21B,Y10T

Abstract:
1. A method of injecting fluid into a well comprising: (a) isolating first and second formations in a well from one another; (b) providing flow valves comprising: (c) extending conduit from a wellhead assembly into the well, the conduit having a first port in fluid communication with the first formation and a second port in fluid communication the second formation and providing a flow valve on each of the first port and second port; and (d) pumping fluid down the conduit and to the ports, so that when the fluid enters the inlets in the flow valves, flows to an annulus circumscribing the sliding sleeve, flows radially inward through the second openings, flows through the orifice and to the outlet in the body when the first openings are in registration with the openings in the fixed sleeve, and so that when the fluid generates a pressure drop through the orifice, the sliding sleeve is moved to reduce an amount of flow through the first openings thereby controlling flow through each of the ports so that the flow rates through each of the ports is substantially constant as the pressure difference between the conduit and the first and second formations vary.