Abstract: A wear prevention system for a pumping system of a oil or gas well, the system comprising a sucker rod string comprising a plurality of rod components, a production pipe string, couplers for the rod components and centralizers for the rod components within the production pipe wherein centralizers are on the couplers. The centralizers contain integral signal mediums which are released as the centralizer becomes worn. The sucker rod string comprises rod components of different lengths and the rod components of relative shortest length are positioned at points of greatest curvature in the well. The rod components of relative shortest length have centralizers which contain different signal mediums to the rod components of relative longest length.

Abstract: A wear prevention system for a pumping system of a oil or gas well, the system comprising a sucker rod string comprising a plurality of rod components, a production pipe string, couplers for the rod components and centralizers for the rod components within the production pipe wherein centralizers are on the couplers. The centralizers contain integral signal mediums which are released as the centralizer becomes worn. The sucker rod string comprises rod components of different lengths and the rod components of relative shortest length are positioned at points of greatest curvature in the well. The rod components of relative shortest length have centralizers which contain different signal mediums to the rod components of relative longest length.

Abstract: A hook for manipulation of lines, the hook comprising an aduncate body, the body defining an opening between at least two portions thereof, the body further comprising a first shaped opening including an entry of a first dimension and an enlarged portion of a second dimension, wherein the second dimension is larger than the first dimension, a second shaped opening including an entry of a first dimension and an enlarged portion of a second dimension, wherein the second dimension is larger than the first dimension, the respective entries to the first and second shaped openings oriented in different directions, the hook further comprising a shuttle including a first retention pin, a second retention pin and a spacing body to space the first retention pin and the second retention pin from one another, the first retention pin shaped to pass the entry of the first shaped opening when oriented in a first position and to be prevented passage when not in the first position and the second retention pin shaped to pass t

Abstract: A hook for manipulation of lines, the hook comprising an aduncate body, the body defining an opening between at least two portions thereof, the body further comprising a first shaped opening including an entry of a first dimension and an enlarged portion of a second dimension, wherein the second dimension is larger than the first dimension, a second shaped opening including an entry of a first dimension and an enlarged portion of a second dimension, wherein the second dimension is larger than the first dimension, the respective entries to the first and second shaped openings oriented in different directions, the hook further comprising a shuttle including a first retention pin, a second retention pin and a spacing body to space the first retention pin and the second retention pin from one another, the first retention pin shaped to pass the entry of the first shaped opening when oriented in a first position and to be prevented passage when not in the first position and the second retention pin shaped to pass t

Abstract: A Stirling cycle engine having two chambers (formed by 12-14, or 12, 15 and 16) containing a working fluid and rotatable rotor disks (10, 11) coupled to a common output power shaft (3). Each chamber has a hot zone and a cold zone, and a passage (23) leads from the hot zone in one chamber to the cold zone in the other chamber and a passage (24) leads from the hot zone in the other chamber to the cold zone in the one chamber. Each rotor disk (10, 11) has a displacer section (5) for displacing the working fluid and a turbine section (6) having turbine blades (7) arranged along its periphery. The disks (10, 11) rotate out of phase with each other and working fluid from the respective passages (23, 24) is directed to the blades (7) to rotate the disks (10, 11) when engine is in operation.