A.C. DRILLING - TRAND OR NECESSITY Authors: ph. d. eng. Ion POTARNICHE - general manager dipl. eng. Sergiu ROZENBERG technical director dipl. eng. Cornelia POPESCU
ICPE ACTEL Privately joint-stock company with 100% Romanian capital Producer of : customized turnkey solution and products of power electrical drives Exporter Member of chambers of commerce, professional associations ( ACFR)
ICPE ACTEL the single Romanian supplier of power electrical drives system for offshore and onshore drilling rigs ICPE ACTEL s expertise 40 years in offshore and onshore drilling Offshore drilling rigs: GLORIA FORTUNA PROMETEU ORIZONT ATLAS SATURN JUPITER 1976 GLORIA (ICPE ACTEL s Archive photo)
Drilling electric drives systems A brief history D.C. main motors Ward Leonard systems Magnetic amplifiers Converters with thiristors A.C. main motors Frequency converters electric drillings
The Drilling electric drives systems - today Main motors Converter type Control type Command type D.C. SCR A.C./D.C. SIMOREG DC MASTER A.C./A.C. SINAMICS G150 Controlled speed PLC A.C. VFD A.C./A.C. SINAMICS S120, with D.C. current bus-bar for all main motors
D.C. Drilling- Principles- Disadvantages Um k x Ua x cos α Um motor s voltage k converter s constant Ua supply voltage α firing angle of converters thyristors Um kem x Φ x n + RI kem rotorical electromagnetic constant Φ statoric flow n motor speed R rotoric resistance I rotoric current Ua If RI 0, then n cosα, cosα med 0,4...0,5 For medium speed nmed P Ua x Ia x cosϕ Q Ua x Ia x sin ϕ For cos ϕ 0,4 and sin ϕ 0,92 cos ϕ 0,5 and sin ϕ 0,866 M Um N
D.C. Drilling - Conclusions Machine work at medium speed Consumes: P active power 2 x Q reactive power P loss active power along the transport lines
A.C. Drilling Principle- Disadvantages Principle Um kη x Ua kη conversion factor, kη < 1, (usually kη 0,96) Ua L Ui C M Um N LC filter If cos ϕ ct 0,86, then Consumes: sin ϕ 0,5 P active power ½ Q reactive power P loss active power along the transport lines Disadvantage The bigger price of A.C./A.C. converter (P ct ) Recompensed by resulted economies in few months Machine work at medium speed
CONCLUSIONS - Comparative example Main motors Power supply: JUPITER offshore rig 11 x D.C. motors of 850 kw 2 x draw works 3 x 2 pumps 1 rotary table 2 x lifting pumps 5 x motor-generator sets x 1500 kva SATURN offshore rig (2009) 11 x A.C. motors of 850 kw 2 x draw works 3 x 2 pumps 1 rotary table 2 x lifting pumps 5 x motor-generator sets x 1500 kva Fuel consumption /hour FC D.C. 0,8 x FC D.C.
Advantages of using of A.C./A.C. converters for drilling Apply to all types of supply : Lines of 6 kv, 10 kv, 20 kv Diesel motor generator sets Both of them Fast and efficiently communication by PROFIBUS interface Easily parameters setting by graphic control panels: Local On the drilling chief desk Low THD factor by: line reactors on the rectifiers input rectifiers supplied by 2 transformers with 30 displacement of phase High efficiency (η) Saved energy by power management High power factor ( cos ϕ 0.86 0,92) Diagnosis, monitoring, failures memory, short dead times A.C. motors advantages: strong, simply, safety, high dynamical performances
INTERNAL REFERENCES ONSHORE DRILLING UPETROM 1 Mai Ploiesti, UPET Targoviste, UZTEL, DAFORA Medias, FOSERCO Tg. Ocna, FORAJ SONDE Tg. Mures, etc. OFSHORE DRILLING RIGS: GLORIA, ATLAS, FORTUNA, JUPITER, HORISONT, PROMETEU, SATURN, jackets on Black Sea ICPE ACTEL is member of ACFR - Romanian Drilling Contracting Association. EXPORT: France Indonesia Iraq Libya Kazakhstan Russia Ukraine United Arab Emirates
ICPE ACTEL s ADVISE: Use the A.C. DRILLING!
CONTACT: ROMANIA, BUCHAREST 313 Splaiul Unirii, District 3, OP 77 Tel: 0040-021-346.86.90, 0040-021-346.86.91 Fax: 0040-021-346.72.67 E-mail: office.actel@icpe-actel.ro http://www.icpe-actel.ro
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