Patent ID: 8607863

Claim:
A method of servicing a wellbore extending from a surface and penetrating a subterranean formation, comprising: placing a workstring in the wellbore, wherein the workstring comprises at least a first downhole tool, a signal receiver subassembly, and a conveyance between the first downhole tool and the surface, wherein the first down hole tool and the signal receiver subassembly are coupled to a downhole end of the conveyance; transmitting a first velocity signal by axially moving the workstring in the wellbore proximate to the surface, wherein transmitting the first velocity signal comprises axially moving the workstring to transmit a first discrete value and maintaining the workstring stationary to transmit a second discrete value and wherein the first velocity signal encodes a first discrete number as a sequence of discrete values; receiving by the signal receiver subassembly the first velocity signal generated by contact between the wellbore and the workstring proximate to the first downhole tool; and initiating a first function of the first downhole tool based on the first velocity signal.