Drilling rods or pipes Flexible drill strings Kellies Drill collars Sucker rods; Cables Casings Tubings

EFIXED CONSTRUCTIONS E21Mining E21BEARTH DRILLING

E21B17/00Drilling rods or pipes Flexible drill strings Kellies Drill collars Sucker rods; Cables Casings Tubings

E21B17/003with electrically conducting or insulating means E21B17/006Accessories for drilling pipes E21B17/01Risers E21B17/012with buoyancy elements E21B17/015Non-vertical risers E21B17/017Bend restrictors for limiting stress on risers E21B17/02Couplings joints E21B17/021Devices for subsurface connecting or disconnecting by rotation E21B17/023Arrangements for connecting cables or wirelines to downhole devices E21B17/025Side entry subs E21B17/026Arrangements for fixing cables or wirelines to the outside of downhole devices E21B17/028Electrical or electro-magnetic connections E21B17/03between drilling rod or pipe and drill motor E21B17/04between rod or the like and bit or between rod and rod or the like E21B17/042threaded E21B17/0423with plural threaded sections E21B17/0426with a threaded cylindrical portion E21B17/043with locking means E21B17/046with ribs, pins or jaws, and complementary grooves or the like E21B17/05Swivel joints E21B17/06Releasing-joints E21B17/07Telescoping joints for varying drill string lengths Shock absorbers E21B17/073with axial rotation E21B17/076between rod or pipe and drill bit E21B17/08Casing joints E21B17/085Riser connections E21B17/10Wear protectors Centralising devices E21B17/1007for the internal surface of a pipe E21B17/1014Flexible or expansible centering means E21B17/1021with articulated arms or arcuate springs E21B17/1028with arcuate springs only E21B17/1035for plural rods, pipes or lines E21B17/1042Elastomer protector or centering means E21B17/105split type E21B17/1057Centralising devices with rollers or with a relatively rotating sleeve E21B17/1064Pipes or rods with a relatively rotating sleeve E21B17/1071specially adapted for pump rods E21B17/1078Stabilisers or centralisers for casing, tubing or drill pipes E21B17/1085Wear protectors; Blast joints; Hard facing E21B17/1092Gauge section of drill bits E21B17/12Devices for placing or drawing out wear protectors E21B17/14Casing shoes for the protection of the bottom of the casing E21B17/16Drill collars E21B17/18Pipes provided with plural fluid passages E21B17/20Flexible or articulated drilling pipes E21B17/203with plural fluid passages E21B17/206with conductors E21B17/22Rods or pipes with helical structure