For use in preparing cement to cement a well, a cement metering system is set forth. The preferred and illustrated embodiment incorporates flow meters measuring water delivered to a cement jet mixer for cement and water into a slurry. A downstream density meter is included. A second water line dilutes...http://www.google.com.au/patents/US4654802?utm_source=gb-gplus-sharePatent US4654802 - Cement metering system
