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1. (WO2010084137) METHOD FOR REDUCING FILTRATE LOSS FROM OIL BASED DRILLING FLUIDS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2010/084137 International Application No.: PCT/EP2010/050652
Publication Date: 29.07.2010 International Filing Date: 20.01.2010
IPC:
C09K 8/76 (2006.01)
C CHEMISTRY; METALLURGY
09
DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
K
MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
8
Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
60
Compositions for stimulating production by acting on the underground formation
62
Compositions for forming crevices or fractures
72
Eroding chemicals, e.g. acids
74
combined with additives added for specific purposes
76
for preventing or reducing fluid loss
Applicants:
LAMBERTI SPA [IT/IT]; Ufficio Brevetti via Piave 18 I-21041 Albizzate (VA), IT (AllExceptUS)
FEDERICI, Franco [IT/IT]; IT (UsOnly)
BOSSI, Thierry [IT/IT]; IT (UsOnly)
PARISI, Christian [IT/IT]; IT (UsOnly)
MERLI, Luigi [IT/IT]; IT (UsOnly)
MORO, Daniele [IT/IT]; IT (UsOnly)
PIROVANO, Pierangelo [IT/IT]; IT (UsOnly)
LI BASSI, Giuseppe [IT/IT]; IT (UsOnly)
Inventors:
FEDERICI, Franco; IT
BOSSI, Thierry; IT
PARISI, Christian; IT
MERLI, Luigi; IT
MORO, Daniele; IT
PIROVANO, Pierangelo; IT
LI BASSI, Giuseppe; IT
Priority Data:
VA2009A00000723.01.2009IT
Title (EN) METHOD FOR REDUCING FILTRATE LOSS FROM OIL BASED DRILLING FLUIDS
(FR) PROCÉDÉ DE RÉDUCTION DES PERTES DE FILTRAT DE BOUES DE FORAGE À BASE D'HUILE
Abstract:
(EN) A method for reducing filtrate loss of oil based drilling fluids comprising the following steps: a) preparing by emulsion polymerization an aqueous dispersion containing: i) from 20% to 60% by weight of a copolymer comprising from 60% to 90% by weight of styrene and/or vinyltoluene monomers, from 7 to 40% by weight of 2-ethylhexyl acrylate monomers and from 0.01 to 3 % of polyfunctional unsaturated monomers; ii) from 40 to 80% by weight of water; iii) from 0.1% to 5% by weight of at least one surfactant; b) providing an oil based drilling fluid containing the aqueous dispersion obtained from step a), or its copolymer in powder form; c) injecting and circulating the drilling fluid in the borehole.
(FR) Le procédé ci-décrit consiste à a) préparer par polymérisation en émulsion une dispersion aqueuse contenant i) 20 à 60 % en poids d'un copolymère comprenant 60 à 90 % en poids de monomères de styrène et/ou de vinyltoluène, 7 à 40 % en poids de monomères d'acrylate de 2-éthylhexyle et 0,01 à 3 % en poids de monomères polyfonctionnels insaturés, ii) 40 à 80 % en poids d'eau et iii) 0,1 à 5 % en poids d'au moins un tensioactif, b) obtenir une boue de forage à base d'huile contenant la dispersion aqueuse obtenue à l'étape a) ou son copolymère sous forme de poudre, et c) injecter et faire circuler la boue de forage dans le forage.
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, 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, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, 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, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (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, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP2382280US20110281778BRPI1007065