EP 0039278 B1 19830831 - APPARATUS FOR DETERMINING THE STUCK POINT OF DRILL PIPES IN A BOREHOLE
Title (en)
APPARATUS FOR DETERMINING THE STUCK POINT OF DRILL PIPES IN A BOREHOLE
Publication
Application
Priority
FR 8009751 A 19800430
Abstract (en)
[origin: US4351186A] The apparatus includes a body member lowered within drill pipes and having an upper part (26) and a lower part (27) arranged for limited movements with respect to each other. Each part of the body member is anchored inside the drill pipes and the movements between said parts are detected when stresses are applied to the drill pipes from the surface. A first radial-coil transformer has a primary winding (35) integral with a part of the body member and a secondary winding (36,37) integral with the other part to detect the angular movements. A second axial-coil transformer has a primary winding (40) integral with a part of the body member and a secondary winding (41,42) integral with the other part to detect the longitudinal movements. The signals delivered by the transformers are linear functions of the respective movements.
IPC 1-7
IPC 8 full level
E21B 47/09 (2012.01)
CPC (source: EP US)
E21B 47/09 (2013.01 - EP US)
Citation (examination)
US 3153339 A 19641020 - ALEXANDER FORD I, et al
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0039278 A1 19811104; EP 0039278 B1 19830831; AU 538886 B2 19840830; AU 6951481 A 19811105; BR 8102371 A 19811222; CA 1163693 A 19840313; DE 3160808 D1 19831006; EG 14617 A 19850331; FR 2481737 A1 19811106; FR 2481737 B1 19831014; JP S5733692 A 19820223; JP S6321798 B2 19880509; MX 149080 A 19830818; MY 8500057 A 19851231; NO 811334 L 19811102; US 4351186 A 19820928
DOCDB simple family (application)
EP 81400626 A 19810421; AU 6951481 A 19810414; BR 8102371 A 19810415; CA 375531 A 19810415; DE 3160808 T 19810421; EG 23981 A 19810429; FR 8009751 A 19800430; JP 6609781 A 19810430; MX 18706781 A 19810429; MY 8500057 A 19851230; NO 811334 A 19810415; US 25821881 A 19810427