Hydra Rig, Inc.

Construction Technology, Inc.

Raymond E Lance

John E Goode

Michael D Hoyle

Ronald N James

In a combined liquid natural gas and compressed natural gas fueling station, liquid natural gas is stored in a cryogenic tank and dispensed to vehicles on demand. Compressed natural gas is produced on demand from the liquid natural gas by a high-efficiency pump and vaporizer system and dispensed directly to vehicles or stored for later dispensing. For greater efficiency, the pump and vaporizer system is powered by combustion of natural gas, including gas bled off to relieve pressure from the cryogenic tank.

Liquid natural gas and compressed natural gas total fueling system

There is provided an improved coiled tubing injector for injecting and withdrawing a length of flexible, cylindrical tubing into and from a well bore. The improved injector comprises first and second sets of gripper shoes, and drive mechanism for moving the sets of gripper shoes around first and second endless paths, respectively. The endless paths include parallel sections disposed on opposite sides of a length of the tubing. Within these parallel sections, the gripper shoes are pressed against the tubing with sufficient force to hold the tubing therebetween. Each gripper shoe includes a base portion connected to the drive mechanism and at least two substantially nondeformable gripper elements, each having cylindrical gripping surfaces corresponding to the outer surface of the tubing. A body of elastomeric material connects the gripper elements to the base portion and permits movement of the gripper elements between open and closed positions.

Coiled tubing injector

A hydraulic impact device has a hammer member carrying a piston which is reciprocally disposed in a cylinder chamber to form an expansible chamber. When the expansible chamber is pressurized, the hammer is retracted against an air spring or other energy storage device by the high pressure. A sleeve valve is reciprocally disposed in the cylinder chamber between the piston and the energy storage device and is held against the piston by an imbalanced fluid pressure as the hammer is retracted against the spring. When the piston and sleeve valve have been retracted to a predetermined position, high pressure fluid is ported between the sleeve valve and piston to hydraulically separate the two members. The chamber pressure is then equalized on both sides of the piston at the return line pressure so that the air spring can accelerate the hammer to deliver an impact blow to an anvil and thence a tool with minimum resistance to movement of the piston by the hydraulic fluid as the chamber pressure is reduced to return line pressure. The sleeve valve is then again moved downwardly against the piston member by an imbalanced pressure condition. When the sleeve valve moves downwardly and seats against the piston, the piston and sleeve are again retracted by the high pressure and the cycle is repeated. The chamber wall is shaped to provide a hydraulic cushion for the hammer near the end of its impact stroke and to provide a seat for the piston apart from the sleeve valve so that high pressure fluid is bypassed to reservoir until a predetermined load is placed on the hammer.

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Fort Worth, TX, United States of America

Raymond E Lance