Resonant bench for fatigue testing of steel drill pipe connections

Transcription

1 Resonnt bench for ftigue testing of steel drill pipe connections Autori: Prof. L. Bertini Ing. C. Sntus Ing. J. Boulet Ing. P. Leclerc Ing. C. Desmzures Università di Pis VAM Drilling TOTAL GDF SUEZ 1/19

2 Drill string / Drill pipes Threded connection Drill string ~ mm ~10m Drill Pipe Drill Pipe mud 1000 m 5000 m Oilfield 2/19

3 Devited/horizontl oil well drilling [*] O. Visberg, O. Vincké, G. Perrin, J.P. Srd, J.B. Fÿ. Ftigue of Drillstring: Stte of Art. Oil nd Gs Science nd Technology Revue de l Institut Frnçis du Petrole, 57(1):7 37, /19

4 Drill pipe, steel Tool Joint ISO Petroleum nd nturl gs industries Drilling nd production equipment Drill stem design nd operting limits. Stndrd, ISO, 1993 Pipe body Upset region Friction welding section Conicl threded connection Smller bending modulus section (no stress conc.) Criticl section Het ffected section Lst (First) Engged Thred sec., stress concentrtion 4/19

5 Drill pipe, ADP-STJ ISO Petroleum nd nturl gs industries Alluminum lloy drill pipe. 2nd edition, 2007 Criticl section, fretting ftigue init. [*] L. Bertini, M. Beghini, C. Sntus, A. Bryshnikov. Resonnt test rigs for ftigue full scle testing of oil drill string connections. Interntionl Journl of Ftigue, 30(6): , [*] C. Sntus. Fretting ftigue of luminum lloy in contct with steel in oil drill pipe connections, modelling to interpret test results. Interntionl Journl of Ftigue, 30(4): , /19

6 Drill pipe, full scle ftigue testing - 4 point bending scheme, - Rotting pipe, - Test frequency rnge: 5-15 Hz. [*] G.F. Miscow, P.E.V. DeMirnd, T.A. Netto, J.C.R. Plácido. Techniques to chrcterize ftigue behviour of full size drill pipes nd smll scle smples. Interntionl Journl of Ftigue, 26(6): , /19

7 Drill pipe, full scle ftigue testing - 4 point bending scheme, - Rotting pipe, - Test frequency: 17 Hz. [*] M. Veidt, A. Berezovski. Design nd ppliction of drill pipe ftigue test fcility. Proceedings of the Structurl Integrity nd Frcture Interntionl Conference. Brisbne, Austrli, /19

8 Steel drill pipe rotting ftigue resonnt bench Fixed mss Inverter Specimen pipe Rubber wheels Fixed & rotting msses Bsement - Light frme, - Test frequency: 30 Hz. 8/19

9 Frequency nd vibrtionl mode control Undeformed shpe Modl node Rotting deformed shpe st 1 fn = 30 Hz Fixed mss Modl node Rotting mss Fixed mss 9/19

10 Test lod control Preliminr bending verifiction (sttic) Lod cell Hydrulic ctutor Strin gge 10/19

11 Test lod control Strin Gge TJ Box TJ Pin Strin Gge BOX Expected frcture section Strin Gge PIN FE bending distribution Mesured: σ =178MP Expected: σ = 178MP Mesured: σ = 185MP ( Δ % =+ 3.8%) S.G.Box 250 S.G.Pin Box σ = 141MP σ = 141MP σ = 190 MP Pin 11/19

12 Test lod control Lser Deformed trjectory dimeter up to 30 mm Lser displcement mesure & control 12/19

13 Ftigue frcture 295 BOX side PINside 13/19

14 Test results σ,mp DL, (10m) 5-7/8x0.45 S135 grde fit curve: σ = σ (2 N ) f f 1/ k σ = 694 MP f k = 12.9 N f Test n. σ,mp R C,m DL, (10m) DL, (100ft) Nf 1 129±7 123±6 4.66± ±0.66 run out 2 202±10 78±4 7.35± ± ±11 73±4 7.85± ± ±8 101±5 5.67± ±0.82 run out 5 190±10 83±4 6.90± ±0.97 run out 6 244±12 65±3 8.81± ± /19

15 Dog-Leg severity ngle 1 2 σ = R D E c DL = DL = O H 180 R π C H π D DL[ ], H = 10 m, D [m], σ, E[MP] O σ E O H = 10m ( = 100 ft) +σ D O D I σ Devited well (curvture exggerted) Rotting bending R C 1 σ DL ( H = 10 m) R c DL 15/19

16 Dog-Leg severity, xil lod effect σ tnh( KL) π D E KL DL H, = O T KL =, EI π 4 4 I = ( DO DI ) 64 T Bending concentrtion T σ m =, A π 2 2 A= ( DO DI ) 4 2L σ,mx σ = Sn S m 1 (Goodmn) Bending concentrtion T 16/19

17 Dog-Leg severity vs. xil lod grph DL, (10 m) No ftigue dmge Rotting bending, no tensile lod Ftigue dmge T,kN Sttic filure, no ftigue 17/19

18 Connection strength comprisons DL, (10 m) DL, (10 m) L h = T ρg A T,kN L h, m 3 10 [*] L. Bertini, M. Beghini, C. Sntus, A. Bryshnikov. Resonnt test rigs for ftigue full scle testing of oil drill string connections. Interntionl Journl of Ftigue, 30(6): , /19

19 Conclusions Resonnt test rig for Steel Drill Pipe full scle ftigue: - light frme of the testing mchine - high frequency testing. Steel drill pipe ftigue frcture wy from the connection region. Ftigue limit 5-7/8x0.45 S135 grde: σ = 190 MP, DLS = 6.9 (H = 10 m). Comprison grphs: - dog-leg severity / xil lod, - dog-leg severity / hung length. 19/19