Wellbore cementing system
Patent 5813457 Issued on September 29, 1998. Estimated Expiration Date: 
August 29, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 29, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2620037 2630179 3545542 3616850 3635288 3796260 3863716 3915226 3926253 Cementing head InventorsAssigneeApplicationNo. 704994 filed on 08/29/1996US Classes:166/153, PISTONS, FLUID DRIVEN INTO WELL (E.G., CEMENTING PLUGS)166/155, With downflow past piston166/177.4CEMENTING DEVICEExaminersPrimary: Tsay, FrankAttorney, Agent or FirmForeign Patent References
International ClassE21B 033/16AbstractA new wellbore cementing system has been developed which includes, in certain embodiments, a plug container with a flow diverter for diverting a portion of flowing fluid away from plugs in the plug container; a plug set system with internal sleeves or dart receivers with shearable parts for shearing to selectively release plugs--all in certain embodiments made of non-metal material and/or plastic; a swivel equalizer with internal valving to isolate a plug set (or any other item) from torque and to relieve pressure below the swivel equalizer; and unique burst tube systems for selectively controlling fluid flow and plug system operation.Other References
Field of SearchWith stopHead for tool, piston or cleaner (e.g., cement head) With piston separator Above ground actuating means for below ground device PISTONS, FLUID DRIVEN INTO WELL (E.G., CEMENTING PLUGS) Surrounding conduit valve or closure opened by piston Cementing, plugging or consolidating With downflow past piston CEMENTING DEVICE | |
