Patent ID: 8776881
Filing Date: 2014-07-15
Classification: E21B

Abstract:
1. A system for production of petroleum from an earth formation, the system comprising: an injection assembly disposable within a first borehole for injecting a thermal source into the formation, the injection assembly including an injector extending from a distal end of the assembly; and a production assembly disposable within a second borehole for recovering material including the petroleum from the formation, the production assembly including a collector extending from a distal end of the assembly, at least one of the injector and the collector including at least a first conduit and at least a second conduit concentric with the first conduit, the first conduit having a first distal end and the second conduit having a second distal end, the first and second distal ends located at different locations along a length of at least one of the first and second borehole.