Friction reduction assembly

Abstract

A friction reduction tool and assembly are selectively activatable to produce fluid pressure pulses in downhole operations. The assembly includes a variable choke assembly having a rotary component and a stationary component, each with passages that enter into and out of alignment when the rotary component rotates with respect to the stationary component when driven by a rotor. The rotary component, stationary component, and rotor each have a central bore defining a central passage permitting fluid flow from above the assembly to below the assembly.

1 . A method of drilling a substantially lateral section of a wellbore using a drilling string, the wellbore comprising a substantially vertical section and a build section connecting the substantially vertical wellbore section and the substantially lateral section, the method comprising:
 providing a first segment of the drilling string having drill pipe connected thereto, the first segment comprising a bottom hole assembly;   at a first determined interval of drill pipe connected to the first segment, connecting a first friction reduction tool and a first activation tool, the first activation tool being in operable communication with the first friction reduction tool for activating the first friction reduction tool, the first friction reduction tool and the first activation tool providing a first friction reduction segment;   connecting further components of the drilling string above the first friction reduction segment;   drilling a portion of the substantially lateral section of the wellbore using the drilling string while the first friction reduction tool is not activated;   at a further determined interval of the drilling string above the first friction reduction segment, connecting a further friction reduction tool and a further activation tool to the drilling string to provide a further friction reduction segment, and connecting further components of the drilling string above the further friction reduction segment;   drilling a further portion of the substantially lateral section of the wellbore using the drilling string while the first friction reduction tool and the second friction reduction tool are not activated;   activating the first friction reduction tool using the first activation tool while at least the first friction reduction tool is positioned in the substantially lateral section of the wellbore; and   drilling still a further portion of the substantially lateral section of the wellbore using the drilling string while the first friction reduction tool is activated and the second friction reduction tool is not activated.