Grease Injection Head is required to obtain a seal when using braided line for heavy duty such as swabbing or fishing. The position is on the top of the lubricator stack.
A Grease Injection control head consists of quick union pin and collar with a ball safety check valve, flow tube carriers, connectors and flow tubes, grease injection and return manifolds and a hydraulic pack-off.
A seal is attained by pumping grease through the annular space between the flow tube and the cable. This action cause a pressure drop to occur across each tube prior to the grease exiting through the return manifold. The injection port is fitted with an integral ball check valve as a safety precaution, in case grease seal is lost.
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