Abstract: Apparatus for injecting tubing into a subterranean well comprising a support frame for a pair of opposed endless conveyor chains fitted with tubing gripper blocks for gripping and conveying the tubing into and out of the well. The conveyor chains are supported by movable ramp members which are each connected to opposed hydraulic cylinder actuators hydraulically interconnected in parallel so that the ramp members may be moved toward and away from each other to uniformly vary the gripping force of the conveyor chains on the tubing. The endless conveyor chains are trained over idler sprockets which are interconnected by opposed hydraulic cylinder actuators for tensioning the chains with substantially equal tensioning forces. The conveyor assembly is mounted on a frame comprising two spaced apart metal plates which are reinforced by spaced apart vertical column members supported on a base.

Abstract: A connecting apparatus for two tubular members including an adapter sleeve extending over the end portion of one of the members in a coaxial relationship therewith and adapted to abutt the end of the other member. A threaded nut means extends over the adapter sleeve in engagement therewith, and is adapted to threadedly engage the outer surface of the corresponding end portion of the other member to connect the members together. The adapter sleeve increases in cross-section in a direction towards the end of the one member to decrease the stress on the latter member accordingly.