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1. (WO2018044277) BIAS CONTROL FOR DOWNHOLE OPTICAL INTENSITY MODULATORS
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Pub. No.: WO/2018/044277 International Application No.: PCT/US2016/049500
Publication Date: 08.03.2018 International Filing Date: 30.08.2016
IPC:
E21B 47/12 (2006.01) ,E21B 41/00 (2006.01)
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
47
Survey of boreholes or wells
12
Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
41
Equipment or details not covered by groups E21B15/-E21B40/95
Applicants:
HALLIBURTON ENERGY SERVICES, INC. [US/US]; 3000 N. Sam Houston Parkway E. Houston, Texas 77032, US
Inventors:
STARK, Daniel Joshua; US
FISHER, Aaron Michael; US
Agent:
TIDWELL, Mark; US
GOULD, James R., Reg. No. 72086; US
BIANCHI, Timothy E., Reg. No. 39,610; US
BEEKMAN, Marvin L., Reg. No. 38,377; US
ARORA, Suneel, Reg. No. 42,267; US
SCHEER, Bradley W., Reg. No. 47,059; US
BLACK, David W., Reg. No. 42331; US
WOO, Justin, Reg. No. 62686; US
Priority Data:
Title (EN) BIAS CONTROL FOR DOWNHOLE OPTICAL INTENSITY MODULATORS
(FR) COMMANDE DE POLARISATION POUR MODULATEURS D'INTENSITÉ OPTIQUE DE FOND DE TROU
Abstract:
(EN) Example embodiments are described for a method and system for direct current (DC) bias control in downhole optical intensity modulators. After receiving an optical signal from a downhole intensity modulator, a harmonic distortion analysis is performed on the optical signal to determine whether a power spectrum of the optical signal deviates by a preselected amount from an expected power spectrum. The expected power spectrum occurs when a bias point is positioned at a quadrature point of a sinusoid associated with the optical signal. A DC bias voltage of the intensity modulator is subsequently adjusted in response to the harmonic distortion analysis.
(FR) Selon des modes de réalisation donnés à titre d'exemple, cette invention concerne un procédé et un système de commande de polarisation en courant continu (CC) dans des modulateurs d'intensité optique de fond de trou. Après réception d'un signal optique provenant d'un modulateur d'intensité de fond de trou, une analyse de distorsion harmonique est effectuée sur le signal optique pour déterminer si un spectre de puissance du signal optique s'écarte selon une grandeur prédéterminée d'un spectre de puissance attendu. Le spectre de puissance attendu se produit lorsqu'un point de polarisation est positionné au niveau d'un point de quadrature d'une sinusoïde associée au signal optique. Une tension de polarisation en CC du modulateur d'intensité est ensuite ajustée en réponse à l'analyse de distorsion harmonique.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)