Method and Apparatus for Injecting Fluid into Spaced Injection Zones in an Oil/Gas Well

摘要

An injection sleeve and apparatus for injecting fluid into a well includes a flow tube having a piston which upon fluid flow opens one or more outlet ports. The injection sleeve is adapted to include a variable orifice insert which prevents flow through the tool at a first selected pressure level until the outlet ports are in an open position, thereby protecting packing seals on either side of the outlet ports from undue wear and tear, and prolonging the life of the tool. At a second pressure level, the variable orifice insert permits flow through injection sleeve to the formation injection zones. A plurality of the sleeves may be used for sequentially injecting fluid into a plurality of injection formation zones surrounding a well. When injection fluid flow is terminated, the injection sleeves act as a dual barrier valve for preventing flow from the injection formation zones back to the well head.

主权项

1. An injection sleeve comprising;
a) an outer housing having one or more outlet ports, b) an axially movable flow tube positioned within the outer housing have one or more outlets adapted to register with the one or more outlet ports, c) the axially movable flow tube including a piston portion, d) a power spring positioned between the outer housing and the axially movable flow tube, said power spring being compressed by axial movement of the flow tube in response to fluid flow within the injection sleeve, and e) a variable orifice insert positioned within the injection sleeve, the variable orifice insert having a valve to regulate the flow through the variable orifice insert.