Liner top squeeze plug below retrievable tool

Abstract

Abstract AN ANNULAR LINER PLUG IS RELEASABLY MOUNTED ON THE LOWER END OF A WELL BORE CEMENTING STRING BY MEANS OF A BALL-TYPE RETAINING AND RELEASING DEVICE. A RELEASING PLUG IS PUMPED DOWN THE CEMENTING STRING, FOLLOWING THE CEMENT USE TO CEMENT A LINER WITHIN THE WELL BORE, AND FORCEABLY ENGAGES WITHIN SLIDABLE SOCKET MEMBER WITHIN THE ANNULAR LINER PLUG. HYDROSTATIC PRESSURE ON THE RELEASING PLUG RESULTS IN THE SHEARING OF AN ATTACHMENT MEANS CONNECTING THE SLIDABLE SOCKET WITH THE INTERIOR OF THE ANNULAR LINER PLUG. THE SOCKET MEMBER SLIDES DOWNWARD, UNDER THE FORCE OF THE RELEASING PLUG AND PERMITS THE BALL DEVICE TO OPERATE SO AS TO RELEASE THE ANNULAR LINER PLUG FROM THE CEMENTING STRING. THE LINER PLUG IS PUMPED DOWNWARD AND, ULTIMATELY, SEATS OVER THE LINER AT THE BOTTOM OF A WELL BORE. THE LINER PLUG OPERATES TO SEAL OFF AN ANNULAR GAP BETWEEN THE LINER TOP AND A SURROUNDING CASING. THE RELEASING PLUG, ENGAGED WITHIN THE SOCKET MEMBER OF THE ANNULAR LINER PLUG, NOW OPERATES TO SEAL OFF THE CEMENT BELOW THIS ASSEMBLY FROM THE FLUID DISPOSED ABOVE THIS ASSEMBLY. LATCHING MEANS MAY BE PROVIDED FOR RETAINING THE RELEASING PLUG WITHIN THE ANNULAR LINER PLUG AGAINST ABRUPT BACK PRESSURES OR WELL "KICKING."

Inventors

• 👤 Lee E Perkins

Bibliographic Details