CEMENTING DEVICE AND METHOD FOR CASING PIPE WITH TWO CEMENTING PLUGS Russian patent published in 2007 - IPC E21B33/14 

FIELD: well drilling, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: method involves lowering casing pipe in well; cementing tightened casing pipe in suspended position, wherein the casing pipe is provided with hydromechanical anchoring centrators, which are serially snapped into action in top-down direction during well flushing; creating channels to transfer part of impact action to rock during casing pipe perforation, wherein the channels are created by means of hydromechanical anchoring centrators located under and over perforation zone; providing stretching force application to lower end of casing pipe during well bore flushing. Device comprises shoe, shoe-type nipple, check valve, stop ring, signal ring, casing pipe with cementers, scrapers and centrators connected to casing pipe, cementing head with upper and lower cementing plugs. Device has at least two hydromechanical anchoring centrators. Lower anchoring centrator is located under perforation zone at check valve installation level. Next anchoring centrators are arranged over perforation zone. Hydromechanical anchoring centrators are serially snapped into action in top-down direction during well flushing.

EFFECT: increased quality of well wall consolidation.

2 cl, 3 dwg