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1. (WO1991007568) METHOD FOR FINISHING A WELL
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007568 International Application No.: PCT/SU1989/000287
Publication Date: 30.05.1991 International Filing Date: 17.11.1989
IPC:
E21B 21/08 (2006.01) ,E21B 33/138 (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
21
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
08
Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
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
33
Sealing or packing boreholes or wells
10
in the borehole
13
Methods or devices for cementing, for plugging holes, crevices, or the like
138
Plastering the borehole wall; Injecting into the formation
Applicants:
MINISTERSTVO GAZOVOI PROMYSHLENNOSTI SSSR [SU/SU]; ul. Stroitelei, 8-1 Moscow, 117939, SU (AllExceptUS)
MAVLJUTOV, Midkhat Rakhmatullich [SU/SU]; SU (UsOnly)
POLYAKOV, Vladimir Nikolaevich [SU/SU]; SU (UsOnly)
BAIRAKOV, Marat Nilovich [SU/SU]; SU (UsOnly)
AGLIULLIN, Akhtyam Khalimovich [SU/SU]; SU (UsOnly)
Inventors:
MAVLJUTOV, Midkhat Rakhmatullich; SU
POLYAKOV, Vladimir Nikolaevich; SU
BAIRAKOV, Marat Nilovich; SU
AGLIULLIN, Akhtyam Khalimovich; SU
Agent:
THE USSR CHAMBER OF COMMERCE AND INDUSTRY; ul. Kuibysheva, 5/2 Moscow, 103735, SU
Priority Data:
Title (EN) METHOD FOR FINISHING A WELL
(FR) PROCEDE DE FINITION D'UN PUITS
Abstract:
(EN) The invention relates to methods of boring. The method provides for stripping the roof part of the production zone, having an unusually high rock pressure, with a weighted drilling mud and stripping its remaining part with lightened muds, while simultaneously sealing the walls of the well in its roof part with hydromonitored jets of the drilling mud. The density of the lightened drilling mud is chosen so as to provide a static depression on the sealed interval. The invention may be used, in particular, for stripping a gas or gasocondensate horizon of considerable thickness (more than 500 m) to prevent gas emerging from its roof and a drilling mud absorption at its foot part, as well as to prevent seizing of the drilling or casing strings.
(FR) L'invention concerne des procédés de forage. Le procédé prévoit le dégagement de la couverture de la zone de production, caractérisé par une pression de roche particulièrement élevée, à l'aide d'une boue de forage chargée et le dégagement de sa partie restante allégée tout en colmatant simultanément les parois du puits dans sa partie de couverture à l'aide de jets hydrocontrôlés de boue de forage. La densité de la boue de forage allégée est choisie de manière à prévoir une dépression statique dans l'intervalle colmaté. L'invention peut être utilisé en particulier pour dégager un horizon à gaz ou à condensat de gaz de grande épaisseur (de plus de 500 m) afin d'éviter le dégagement de gaz dans la partie de couverture et l'absorption de boue de forage à sa partie inférieure, ainsi que pour éviter tout grippage des colonnes de forage ou de tubage.
Designated States: NO, US
European Patent Office (AT, BE, CH, DE, ES, FR, GB, IT, LU, NL, SE)
Publication Language: Russian (RU)
Filing Language: Russian (RU)