Patent ID: 8863852
Filing Date: 2014-10-21
Classification: E21B

Abstract:
1. A downhole tool for circulating fluid within a well bore comprising: a tubular housing configured with a conductor for passage of a signal between communication elements disposed at the ends thereof; wherein the communication elements are configured to link the housing to a downhole communication network; the housing having an outer port; a piston slidably disposed in the housing and having one or more piston ports; an inner flow bore extending through the housing and the piston including a primary fluid flow path; and an obturating member defining a through tool bypass from the primary fluid flow path around the obturating member and back to the primary fluid flow path; wherein the piston includes a first position isolating the outer port from the primary fluid flow path and a second position exposing the outer port to the primary fluid flow path to provide a bypass flow path between the inner flow bore and a well bore annulus; wherein the piston is moveable between the first and second positions in response to a pressure differential across the obturating member while the signal is passable along the conductor in the tubular housing.