CA2657557A1 - Pipe string device for conveying a fluid from a well head to a vessel - Google Patents
Pipe string device for conveying a fluid from a well head to a vessel Download PDFInfo
- Publication number
- CA2657557A1 CA2657557A1 CA002657557A CA2657557A CA2657557A1 CA 2657557 A1 CA2657557 A1 CA 2657557A1 CA 002657557 A CA002657557 A CA 002657557A CA 2657557 A CA2657557 A CA 2657557A CA 2657557 A1 CA2657557 A1 CA 2657557A1
- Authority
- CA
- Canada
- Prior art keywords
- pipe string
- fluid
- vessel
- well
- terized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 49
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000005553 drilling Methods 0.000 claims description 15
- 229940090044 injection Drugs 0.000 claims 4
- 230000005484 gravity Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/12—Conveying liquids or viscous products by pressure of another fluid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/001—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor specially adapted for underwater drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
- Earth Drilling (AREA)
- Air Transport Of Granular Materials (AREA)
- Pipeline Systems (AREA)
Abstract
A method and pipe string device (1) for conveying a fluid from a well head (2) to a vessel (8), the fluid in the pipe string (1) needing, for well-technical reasons, to be given a flow boost, and the pipe string (1) being provided with at least one injection point for a driving fluid, the injection point may be constituted by an ejector (20).
Description
Pipe string device for conveying a fluid from a well head to a vessel.
This invention relates to a pipe string. More particularly, it relates to a pipe string for conveying a fluid from a well head to a vessel, in which, for well-technical reasons, the fluid located in the pipe string needs to be given a flow boost, and in which the pipe string is provided along its length with at least one injection point for a driving fluid.
The injection point may be formed by a fluid-operated ejector. The invention also includes a method of using the io device.
In the drilling for and recovery of petroleum it is necessary, for drilling- and well-technical reasons, to use a well fluid which is adapted for the conditions in the well with respect to density and viscosity, among other things. It is is common, for example, to use drilling fluid having a density of approximately 1.6 kg/l.
During the first phase of the drilling it has previously been common to use "disposable drilling fluid" and deposit the effluent cuttings on the sea floor, which is unfavourable to 20 the environment and which also means increased costs.
US patent 6745851 deals with work of this kind and discloses a pump-operated solution which can recover and recirculate the drilling fluid.
RECTIFIED SHEET (RULE 91) In drilling at great depths offshore, the head from the drilling vessel down to the well formation may become so great that drilling fluid penetrates into the formation. Such a flow of drilling fluid into the formation is unfortunate both because relatively expensive drilling fluid is lost, but also because an inflow of this kind may reduce the future productivity of a well.
A method which has gained some ground in offshore wells involves the drilling fluid being pumped, as it is returning zo from the borehole, out at the well head on the sea floor, then flowing back to the vessel via a separate pipe.
In this way the static pressure in the borehole can be controlled, for example by controlling the liquid head in the riser, if such is installed, between the well head and vessel.
NO patent 319213 (W02005052307) discloses a method directed towards controlling the liquid pressure in the well by filling the upper portion of the riser with a fluid having a different density relative to the density of the drilling fluid.
At relatively great sea depths, at which the return pipe necessarily is long, the necessary pump pressure at the sea floor is relatively high because of the density and viscosity of the drilling fluid. It has turned out to be difficult to achieve the necessary flow rate without having to use pipes of a relatively large diameter, which entails increased pipe weight and thereby considerably higher investment costs.
The invention has as its object to remedy or to reduce at least one of the drawbacks of the prior art.
The object is achieved through features specified in the description below and in the claims that follow.
A pipe string in accordance with the invention for conveying a fluid from a well head to a vessel, in which the fluid located in the pipe string needs, for well-technical reasons, to be given a flow boost, is characterized by the pipe string being provided along its length with at least one injection point for a driving fluid.
The injection point is most advantageously constituted by a fluid-operated ejector.
One such injection point or more can be disposed at suitable intervals along the pipe string from the sea floor and up to the vessel. The pipe string forms a separate flow path relative to a possible riser.
When the injection point is constituted by an ejector, a possible ejector located above will relieve the ejector located below, so that this ejector starts a flow feeding the ejector located above with fluid.
Alternatively, a pump may be arranged, pumping the fluid through the pipe string, one or more ejectors at the upper portion of the pipe string forming auxiliary apparatuses for a sufficient flow rate through the pipe string to be achieved.
Typically, the driving fluid has a lower density than the fluid located in the pipe string. Thus, on injection of a second fluid the overall liquid pressure within the fluid string at the sea floor will be reduced.
If the second fluid comprises a gas, the gas may expand as it rises in the pipe string, thereby further reducing the overall liquid pressure within the pipe string at the sea floor.
The pipe string may be anchored on the sea floor and be provided with buoyancy bodies at its upper portion, or it may be suspended from the vessel which then carries the weight of the pipe string.
The device and method according to the invention may provide a satisfactory flow rate in the pipe string, even with the use of a pipe string of a relatively small diameter.
In what follows is described an example of a preferred embodiment and method which are visualized in the accompanying drawings, in which:
Figure 1 shows schematically a vessel which is provided with a.pipe string in accordance with the invention; and Figure 2 shows the invention in an alternative embodiment.
is In the drawings the reference numeral 1 indicates a pipe string which is connected at its lower end portion to a well head 2 on the sea floor 4, and which is connected at its upper end portion to a separator 6. The separator 6 is located on a vessel 8.
The vessel 8 is typically carrying out work in a well 10 in the ground and is connected to the well 10 by means of a pipe connection 12 extending through the well head 2. Dependent on the operations involved, the pipe connection 12 may comprise, in a manner known per se, one or more of drill pipe, marine riser, work riser or other well intervention tools.
The pipe string 1 is anchored on the sea floor 4 by means of an anchor 14. At its upper portion, near the sea surface 16, is arranged a buoyancy body 18 which is arranged to take the weight of the pipe string 1.
The pipe string 1 is provided with fluid-operated ejectors 20 suitably spaced apart, which are supplied with driving fluid from the vessel 8 via at least one driving-fluid pipe 22.
When a fluid is to be brought to flow through the pipe string 5 1 from the well head 2, the pressure fluid supply via the driving-fluid pipe 22 from the vessel 8 to the ejectors 20 is opened. The flow starts by each ejector 20 supplying the necessary pressure to the fluid until the fluid flows to the next ejector along the pipe string 1.
At the vessel 8 the fluid enters the separator 6, in which possible driving gases are separated from the rest of the fluid before the remaining fluid flows on for treatment in, for example, screening machines, not shown.
The return pressure at the well head 2 can be controlled by adjusting the driving-fluid pressure into the ejectors 20.
In an alternative embodiment, see figure 2, a mechanically working pump 24 is arranged at the lower portion of the pipe string 1. The ejectors 20, which are arranged at the upper portion of the pipe 1, are used here to increase the flow rate through the pipe string 1 beyond that effected by the pump 24 on its own.
This invention relates to a pipe string. More particularly, it relates to a pipe string for conveying a fluid from a well head to a vessel, in which, for well-technical reasons, the fluid located in the pipe string needs to be given a flow boost, and in which the pipe string is provided along its length with at least one injection point for a driving fluid.
The injection point may be formed by a fluid-operated ejector. The invention also includes a method of using the io device.
In the drilling for and recovery of petroleum it is necessary, for drilling- and well-technical reasons, to use a well fluid which is adapted for the conditions in the well with respect to density and viscosity, among other things. It is is common, for example, to use drilling fluid having a density of approximately 1.6 kg/l.
During the first phase of the drilling it has previously been common to use "disposable drilling fluid" and deposit the effluent cuttings on the sea floor, which is unfavourable to 20 the environment and which also means increased costs.
US patent 6745851 deals with work of this kind and discloses a pump-operated solution which can recover and recirculate the drilling fluid.
RECTIFIED SHEET (RULE 91) In drilling at great depths offshore, the head from the drilling vessel down to the well formation may become so great that drilling fluid penetrates into the formation. Such a flow of drilling fluid into the formation is unfortunate both because relatively expensive drilling fluid is lost, but also because an inflow of this kind may reduce the future productivity of a well.
A method which has gained some ground in offshore wells involves the drilling fluid being pumped, as it is returning zo from the borehole, out at the well head on the sea floor, then flowing back to the vessel via a separate pipe.
In this way the static pressure in the borehole can be controlled, for example by controlling the liquid head in the riser, if such is installed, between the well head and vessel.
NO patent 319213 (W02005052307) discloses a method directed towards controlling the liquid pressure in the well by filling the upper portion of the riser with a fluid having a different density relative to the density of the drilling fluid.
At relatively great sea depths, at which the return pipe necessarily is long, the necessary pump pressure at the sea floor is relatively high because of the density and viscosity of the drilling fluid. It has turned out to be difficult to achieve the necessary flow rate without having to use pipes of a relatively large diameter, which entails increased pipe weight and thereby considerably higher investment costs.
The invention has as its object to remedy or to reduce at least one of the drawbacks of the prior art.
The object is achieved through features specified in the description below and in the claims that follow.
A pipe string in accordance with the invention for conveying a fluid from a well head to a vessel, in which the fluid located in the pipe string needs, for well-technical reasons, to be given a flow boost, is characterized by the pipe string being provided along its length with at least one injection point for a driving fluid.
The injection point is most advantageously constituted by a fluid-operated ejector.
One such injection point or more can be disposed at suitable intervals along the pipe string from the sea floor and up to the vessel. The pipe string forms a separate flow path relative to a possible riser.
When the injection point is constituted by an ejector, a possible ejector located above will relieve the ejector located below, so that this ejector starts a flow feeding the ejector located above with fluid.
Alternatively, a pump may be arranged, pumping the fluid through the pipe string, one or more ejectors at the upper portion of the pipe string forming auxiliary apparatuses for a sufficient flow rate through the pipe string to be achieved.
Typically, the driving fluid has a lower density than the fluid located in the pipe string. Thus, on injection of a second fluid the overall liquid pressure within the fluid string at the sea floor will be reduced.
If the second fluid comprises a gas, the gas may expand as it rises in the pipe string, thereby further reducing the overall liquid pressure within the pipe string at the sea floor.
The pipe string may be anchored on the sea floor and be provided with buoyancy bodies at its upper portion, or it may be suspended from the vessel which then carries the weight of the pipe string.
The device and method according to the invention may provide a satisfactory flow rate in the pipe string, even with the use of a pipe string of a relatively small diameter.
In what follows is described an example of a preferred embodiment and method which are visualized in the accompanying drawings, in which:
Figure 1 shows schematically a vessel which is provided with a.pipe string in accordance with the invention; and Figure 2 shows the invention in an alternative embodiment.
is In the drawings the reference numeral 1 indicates a pipe string which is connected at its lower end portion to a well head 2 on the sea floor 4, and which is connected at its upper end portion to a separator 6. The separator 6 is located on a vessel 8.
The vessel 8 is typically carrying out work in a well 10 in the ground and is connected to the well 10 by means of a pipe connection 12 extending through the well head 2. Dependent on the operations involved, the pipe connection 12 may comprise, in a manner known per se, one or more of drill pipe, marine riser, work riser or other well intervention tools.
The pipe string 1 is anchored on the sea floor 4 by means of an anchor 14. At its upper portion, near the sea surface 16, is arranged a buoyancy body 18 which is arranged to take the weight of the pipe string 1.
The pipe string 1 is provided with fluid-operated ejectors 20 suitably spaced apart, which are supplied with driving fluid from the vessel 8 via at least one driving-fluid pipe 22.
When a fluid is to be brought to flow through the pipe string 5 1 from the well head 2, the pressure fluid supply via the driving-fluid pipe 22 from the vessel 8 to the ejectors 20 is opened. The flow starts by each ejector 20 supplying the necessary pressure to the fluid until the fluid flows to the next ejector along the pipe string 1.
At the vessel 8 the fluid enters the separator 6, in which possible driving gases are separated from the rest of the fluid before the remaining fluid flows on for treatment in, for example, screening machines, not shown.
The return pressure at the well head 2 can be controlled by adjusting the driving-fluid pressure into the ejectors 20.
In an alternative embodiment, see figure 2, a mechanically working pump 24 is arranged at the lower portion of the pipe string 1. The ejectors 20, which are arranged at the upper portion of the pipe 1, are used here to increase the flow rate through the pipe string 1 beyond that effected by the pump 24 on its own.
Claims (8)
1. A pipe string device (1) for conveying a fluid from a well head (2) to a vessel (8) during a drilling phase of a well, the fluid located in the pipe string (1) needing, for well-technical reasons, to be given a flow boost, characterized in that the pipe string (1) that is anchored on the sea floor (4), is provided with at least one injection point for a driving fluid.
2. The device in accordance with claim 1, charac-terized in that the injection point is con-stituted by a fluid-operated ejector (20).
3. The device in accordance with claim 1, charac-terized in that a mechanically working pump (24) is connected to the pipe string (1).
4. The device in accordance with claim 1 , charac-terized in that the pipe string (1) leads into a separator tank (6) on the vessel (8).
5. The device in accordance with claim 1, charac-terized in that the pipe string (1) is anc-hored on the sea floor (4) by means of an anchor (14) and provided with a buoyancy body (18) near the sea surface (16 ) .
6. The device in accordance with claim 1, charac-terized in that the pipe string (1) is sus-pended from the vessel (8) and connected to the well head (2) by means of a flexible connection.
7. A method of providing flow assistance to a fluid lo-cated in a pipe string (1) during the drilling phase of a well, the fluid being conveyed by means of the pipe string (1) from a well head (2) to a vessel (8), characterized in that the pipe string (1) is supplied with a driving fluid that has a lower density than the conveyed fluid at least at one injec-tion point located on the pipe string (1).
8. The method in accordance with claim 7, charac-terized in that at the injection point there is supplied a driving fluid which has a lower specific gravity than the fluid located in the pipe string.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20063269 | 2006-07-14 | ||
| NO20063269A NO325931B1 (en) | 2006-07-14 | 2006-07-14 | Device and method of flow aid in a pipeline |
| PCT/NO2007/000269 WO2008007973A1 (en) | 2006-07-14 | 2007-07-13 | Pipe string device for conveying a fluid from a well head to a vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2657557A1 true CA2657557A1 (en) | 2008-01-17 |
Family
ID=38923461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002657557A Abandoned CA2657557A1 (en) | 2006-07-14 | 2007-07-13 | Pipe string device for conveying a fluid from a well head to a vessel |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20100006297A1 (en) |
| EP (1) | EP2041477A1 (en) |
| BR (1) | BRPI0714138A2 (en) |
| CA (1) | CA2657557A1 (en) |
| MX (1) | MX2009000458A (en) |
| NO (1) | NO325931B1 (en) |
| WO (1) | WO2008007973A1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI119923B (en) * | 2005-09-08 | 2009-05-15 | Kemppi Oy | Method and apparatus for short arc welding |
| SG10201600512RA (en) * | 2006-11-07 | 2016-02-26 | Halliburton Energy Services Inc | Offshore universal riser system |
| US8704120B2 (en) * | 2008-07-03 | 2014-04-22 | Esab Ab | Device for handling powder for a welding apparatus |
| US8281875B2 (en) | 2008-12-19 | 2012-10-09 | Halliburton Energy Services, Inc. | Pressure and flow control in drilling operations |
| MX2012002832A (en) * | 2009-09-10 | 2012-04-19 | Bp Corp North America Inc | Systems and methods for circulating out a well bore influx in a dual gradient environment. |
| AU2010346598B2 (en) * | 2010-02-25 | 2014-01-30 | Halliburton Energy Services, Inc. | Pressure control device with remote orientation relative to a rig |
| US8201628B2 (en) | 2010-04-27 | 2012-06-19 | Halliburton Energy Services, Inc. | Wellbore pressure control with segregated fluid columns |
| US8820405B2 (en) | 2010-04-27 | 2014-09-02 | Halliburton Energy Services, Inc. | Segregating flowable materials in a well |
| US8403059B2 (en) * | 2010-05-12 | 2013-03-26 | Sunstone Technologies, Llc | External jet pump for dual gradient drilling |
| US8162063B2 (en) * | 2010-09-03 | 2012-04-24 | Stena Drilling Ltd. | Dual gradient drilling ship |
| US8739863B2 (en) | 2010-11-20 | 2014-06-03 | Halliburton Energy Services, Inc. | Remote operation of a rotating control device bearing clamp |
| US9163473B2 (en) | 2010-11-20 | 2015-10-20 | Halliburton Energy Services, Inc. | Remote operation of a rotating control device bearing clamp and safety latch |
| EP2694772A4 (en) | 2011-04-08 | 2016-02-24 | Halliburton Energy Services Inc | Automatic standpipe pressure control in drilling |
| US9080407B2 (en) | 2011-05-09 | 2015-07-14 | Halliburton Energy Services, Inc. | Pressure and flow control in drilling operations |
| WO2013036397A1 (en) | 2011-09-08 | 2013-03-14 | Halliburton Energy Services, Inc. | High temperature drilling with lower temperature rated tools |
| US9447647B2 (en) | 2011-11-08 | 2016-09-20 | Halliburton Energy Services, Inc. | Preemptive setpoint pressure offset for flow diversion in drilling operations |
| WO2014062664A2 (en) * | 2012-10-15 | 2014-04-24 | National Oilwell Varco, L.P. | Dual gradient drilling system |
| KR101311000B1 (en) * | 2013-01-11 | 2013-09-24 | 주식회사 지앤지테크놀러지 | Apparatus and method for removing local emission and precipitated sand of underground water excavation work |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3815673A (en) * | 1972-02-16 | 1974-06-11 | Exxon Production Research Co | Method and apparatus for controlling hydrostatic pressure gradient in offshore drilling operations |
| US4063602A (en) * | 1975-08-13 | 1977-12-20 | Exxon Production Research Company | Drilling fluid diverter system |
| US4291772A (en) * | 1980-03-25 | 1981-09-29 | Standard Oil Company (Indiana) | Drilling fluid bypass for marine riser |
| US4738313A (en) * | 1987-02-20 | 1988-04-19 | Delta-X Corporation | Gas lift optimization |
| FR2621071B1 (en) * | 1987-09-29 | 1996-01-12 | Inst Francais Du Petrole | METHOD AND SYSTEM FOR PRODUCING AN EFFLUENT CONTAINED IN AN UNDERWATER GEOLOGICAL FORMATION |
| GB8925402D0 (en) * | 1989-11-10 | 1989-12-28 | British Hydromechanics | Pumping liquid/gas mixture |
| NO171330C (en) * | 1990-07-13 | 1993-02-24 | Kvaerner Eng | PROCEDURE FOR AA WEEK PRINTED IN A BROWN STREAM, AND PLANT TO INCREASE THE PRINT IN A BROWN STREAM |
| US6216799B1 (en) * | 1997-09-25 | 2001-04-17 | Shell Offshore Inc. | Subsea pumping system and method for deepwater drilling |
| US6142236A (en) * | 1998-02-18 | 2000-11-07 | Vetco Gray Inc Abb | Method for drilling and completing a subsea well using small diameter riser |
| NO308043B1 (en) * | 1998-05-26 | 2000-07-10 | Agr Subsea As | Device for removing drill cuttings and gases in connection with drilling |
| US6415877B1 (en) * | 1998-07-15 | 2002-07-09 | Deep Vision Llc | Subsea wellbore drilling system for reducing bottom hole pressure |
| US7270185B2 (en) * | 1998-07-15 | 2007-09-18 | Baker Hughes Incorporated | Drilling system and method for controlling equivalent circulating density during drilling of wellbores |
| FR2783559B1 (en) * | 1998-09-21 | 2000-10-20 | Elf Exploration Prod | METHOD FOR CONDUCTING A HYDROCARBON TRANSPORT DEVICE BETWEEN PRODUCTION MEANS AND A TREATMENT UNIT |
| EG22117A (en) * | 1999-06-03 | 2002-08-30 | Exxonmobil Upstream Res Co | Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser |
| NO312915B1 (en) * | 1999-08-20 | 2002-07-15 | Agr Subsea As | Method and device for treating drilling fluid and cuttings |
| OA12314A (en) * | 1999-09-15 | 2006-05-12 | Shell Int Research | System for enhancing fluid flow in a well. |
| US6457529B2 (en) * | 2000-02-17 | 2002-10-01 | Abb Vetco Gray Inc. | Apparatus and method for returning drilling fluid from a subsea wellbore |
| GB2377466B (en) * | 2000-03-02 | 2004-03-03 | Shell Int Research | Wireless downhole measurement and control for optimizing gas lift well and field performance |
| US6530437B2 (en) * | 2000-06-08 | 2003-03-11 | Maurer Technology Incorporated | Multi-gradient drilling method and system |
| NO313261B1 (en) * | 2001-02-02 | 2002-09-09 | Carsten Andersen | Method and apparatus for handling marine organisms and application of method and apparatus |
| US6536540B2 (en) * | 2001-02-15 | 2003-03-25 | De Boer Luc | Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications |
| US6966392B2 (en) * | 2001-02-15 | 2005-11-22 | Deboer Luc | Method for varying the density of drilling fluids in deep water oil and gas drilling applications |
| US6843331B2 (en) * | 2001-02-15 | 2005-01-18 | De Boer Luc | Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications |
| US7090036B2 (en) * | 2001-02-15 | 2006-08-15 | Deboer Luc | System for drilling oil and gas wells by varying the density of drilling fluids to achieve near-balanced, underbalanced, or overbalanced drilling conditions |
| US6926101B2 (en) * | 2001-02-15 | 2005-08-09 | Deboer Luc | System and method for treating drilling mud in oil and gas well drilling applications |
| US7093662B2 (en) * | 2001-02-15 | 2006-08-22 | Deboer Luc | System for drilling oil and gas wells using a concentric drill string to deliver a dual density mud |
| US6802379B2 (en) * | 2001-02-23 | 2004-10-12 | Exxonmobil Upstream Research Company | Liquid lift method for drilling risers |
| NO337346B1 (en) * | 2001-09-10 | 2016-03-21 | Ocean Riser Systems As | Methods for circulating a formation influx from a subsurface formation |
| US6966367B2 (en) * | 2002-01-08 | 2005-11-22 | Weatherford/Lamb, Inc. | Methods and apparatus for drilling with a multiphase pump |
| US6814142B2 (en) * | 2002-10-04 | 2004-11-09 | Halliburton Energy Services, Inc. | Well control using pressure while drilling measurements |
| US20040065440A1 (en) * | 2002-10-04 | 2004-04-08 | Halliburton Energy Services, Inc. | Dual-gradient drilling using nitrogen injection |
| NO20033198D0 (en) * | 2003-07-15 | 2003-07-15 | Norway Seafoods As | Device by trawl |
| NO319213B1 (en) * | 2003-11-27 | 2005-06-27 | Agr Subsea As | Method and apparatus for controlling drilling fluid pressure |
| GB0407659D0 (en) * | 2004-04-03 | 2004-05-05 | Frontier Engineering Solutions | Method and apparatus |
-
2006
- 2006-07-14 NO NO20063269A patent/NO325931B1/en active IP Right Review Request
-
2007
- 2007-07-13 BR BRPI0714138-6A patent/BRPI0714138A2/en not_active IP Right Cessation
- 2007-07-13 EP EP07793921A patent/EP2041477A1/en not_active Withdrawn
- 2007-07-13 MX MX2009000458A patent/MX2009000458A/en unknown
- 2007-07-13 CA CA002657557A patent/CA2657557A1/en not_active Abandoned
- 2007-07-13 WO PCT/NO2007/000269 patent/WO2008007973A1/en active Application Filing
- 2007-07-31 US US12/373,628 patent/US20100006297A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| NO20063269L (en) | 2008-01-15 |
| EP2041477A1 (en) | 2009-04-01 |
| MX2009000458A (en) | 2009-01-27 |
| NO325931B1 (en) | 2008-08-18 |
| WO2008007973A1 (en) | 2008-01-17 |
| US20100006297A1 (en) | 2010-01-14 |
| BRPI0714138A2 (en) | 2012-12-25 |
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| Date | Code | Title | Description |
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| FZDE | Discontinued |
Effective date: 20130715 |