EP0593122A2
Expired / Lapsed
EP
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Blow-out prevention device for shutting off an annulus between a drill column and a well wall
Assignee: Norsk Hydro ASA
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Filing: 1993-10-07
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Granted: —
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Expires: 2013-10-07
Abstract
Abstract A blow-out prevention device (4) for shutting off a annulus (8) between a drill column (7) and a well wall by means of an expandable sealing device (3) when an unwanted blow-out of fluid and/or gas takes place from a geological unstable well formation when drilling for oil or gas. When a blow-out takes place, a compressive-pulse code is activated in the inlet of the drill column (7) and is transmitted through the drilling fluid to a pressure sensor (25) which transmits the compressive-pulse code on to the microprocessor (37) which is preprogrammed with the pressure code. If the pressure codes coincide, an electric motor (27) is activated, which, via a set of gears (30) and a nut-and-bolt device (32, 33), displaces a valve plate (22) axially towards the valve seat (26). The drilling fluid then flows out through the nozzles (24) and causes a big pressure drop which is used to expand a sealing device (3) so that the annulus (8) is shut.
Inventors
- 👤 Sigbjorn Sangesland
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 08:42
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B21/103; E21B33/00; E21B33/10; E21B33/12; E21B33/127
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A blow-out prevention device (4) to shut off a annulus (8) between a drill column (7) and a well wall by means of an expandable sealing device (3) when an unwanted blow-out of fluid and/or gas takes place from a geological unstable well formation when drilling for oil or gas, characterised in that the blow-out prevention device (4) is provided with an internal flow duct (20) through which the drilling fluid flows to a two-way screw-down stop valve arrangement (6) with a valve rod (33) and a double-sided valve plate (22) which steers the drilling fluid either to the drill bit (1) or through a number of exit nozzles (5, 24) subject to a large pressure drop so that a pressure differential arises which is used to expand a sealing device (3) so that the annulus (8) is shut off.
Claim 2
Dependent Claim
140 words
A blow-out prevention device (4) to shut off a annulus (8) between a drill column (7) and a well wall by means of an expandable sealing device (3) when an unwanted blow-out of fluid and/or gas takes place from a geological unstable well formation when drilling for oil or gas, characterised in that the blow-out prevention device (4) is provided with an internal flow duct (20) through which the drilling fluid flows to a two-way screw-down stop valve arrangement (6) with a valve rod (33) and a double-sided valve plate (22) which steers the drilling fluid either to the drill bit (1) or through a number of exit nozzles (5, 24) subject to a large pressure drop so that a pressure differential arises which is used to expand a sealing device (3) so that the annulus (8) is shut off.
Claim 3
Dependent Claim
48 words
A blow-out prevention device in accordance with claim 1, characterised in that, in connection with the valve rod (33) for the two-way screw-down stop valve arrangement (6, 22), there is a spring (35) to ensure sufficient sealing pressure between the valve plate (22) and the valve seat (38).
Claim 4
Dependent Claim
34 words
A blow-out prevention device in accordance with claim 1, characterised in that the valve rod (33) is driven by an electric motor (27) via a set of gears (30) and a nut-and-bolt device (32).
Claim 5
Dependent Claim
22 words
A blow-out prevention device in accordance with claim 1, characterised in that it is provided with an external, circular, pressure-absorbing sleeve (29).
Claim 6
Dependent Claim
22 words
A blow-out prevention device in accordance with claim 1, characterised in that a flexible sleeve (28) is fastened to the sleeve (29).
Claim 7
Dependent Claim
42 words
A blow-out prevention device in accordance with claim 1, characterised in that the electric motor (27) is provided with a control unit which cuts off the power at a preset sealing pressure between the valve plate (22) and the valve seat (26).
Claim 8
Dependent Claim
97 words
Compressive-pulse-operated activation system, characterised in that, in order to activate the motor (27) which drives the two-way valve-seat arrangement (6), a system is used which consists of a compressive-pulse code, a pressure sensor (25) and a microprocessor (37), which, when a blow-out takes place, is activated by a compressive-pulse code being generated in the inlet of the drill column (7) and being transmitted through the drilling fluid to a pressure sensor (25) which transmits the compressive-pulse code on to the microprocessor (37), preprogrammed with the pressure code, which activates the motor (27) when the pressure codes coincide.
Claim 9
Dependent Claim
97 words
Compressive-pulse-operated activation system, characterised in that, in order to activate the motor (27) which drives the two-way valve-seat arrangement (6), a system is used which consists of a compressive-pulse code, a pressure sensor (25) and a microprocessor (37), which, when a blow-out takes place, is activated by a compressive-pulse code being generated in the inlet of the drill column (7) and being transmitted through the drilling fluid to a pressure sensor (25) which transmits the compressive-pulse code on to the microprocessor (37), preprogrammed with the pressure code, which activates the motor (27) when the pressure codes coincide.
References Cited (Backward Citations)
No citation records indexed.
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