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## Rapad Rabbit LLC, USA A lift pump plunger for an oil or gas well is described where a feature of the plunger is that it has a thermoset seal on the plunger to improve the pumping. The seal may be a composite material and the design also facilitates easy seal replacement. Few actual seal details
## and Mahle Metal Leve S.A. Brasil The invention relates to steel or cast iron piston rings with a coating of chromium nitride deposited by a physical vapour deposition on the sliding surface. The coating is composed of a columnar crystal structure of CrN with an oxygen content in solid solution
An apparatus and method for forming or repairing a well-bore casing, a pipeline, or a structural support is disclosed. An expandable tubular member is radially expanded and plastically deformed by an expansion cone that is displaced by hydraulic pressure. Before or after the radial expansion of the