Patent ID: 8844655
Filing Date: 2014-09-30
Classification: E21B

Abstract:
1. A pipe joint for use in rotary boring operations, the pipe joint comprising: a first member having a non-circular exterior surface and a threaded socket; a second member comprising a threaded end portion for mating engagement with the threaded socket and a non-circular exterior surface portion corresponding to the non-circular exterior surface of the first member; and a ground engaging member having a non-circular internal surface and an outer surface for enlarging a borehole, the non-circular internal surface corresponds to the non-circular exterior surface of both the first member and the second member for slidably mounting the ground engaging member on the non-circular exterior surfaces of the first member and the second member when the threaded socket of the first member is engaged with the threaded end portion of the second member and to transmit torque from the first member and the second member to the ground engaging member; a fluid passage formed by an internalin the first member and an internal passage in the second member; a radial extending passage formed in the second member, having an opening formed in the non-circular exterior surface portion of the second member, to guide fluid from the internal passage of the second member to outside the second member; and alignable holes in the ground engaging member and the second member for receiving a fastener to secure the ground engaging member to the second member.