CA2635097A1 - Method for determining formation fluid entry into or drilling fluid loss from a borehole using a dynamic annular pressure control system - Google Patents
Method for determining formation fluid entry into or drilling fluid loss from a borehole using a dynamic annular pressure control system Download PDFInfo
- Publication number
- CA2635097A1 CA2635097A1 CA002635097A CA2635097A CA2635097A1 CA 2635097 A1 CA2635097 A1 CA 2635097A1 CA 002635097 A CA002635097 A CA 002635097A CA 2635097 A CA2635097 A CA 2635097A CA 2635097 A1 CA2635097 A1 CA 2635097A1
- Authority
- CA
- Canada
- Prior art keywords
- pressure
- fluid
- borehole
- annular space
- measured
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract 29
- 238000005553 drilling Methods 0.000 title claims abstract 16
- 238000000034 method Methods 0.000 title claims abstract 12
- 230000015572 biosynthetic process Effects 0.000 title claims abstract 6
- 238000005086 pumping Methods 0.000 claims abstract 4
- 238000007599 discharging Methods 0.000 claims 3
- 230000007423 decrease Effects 0.000 claims 2
- 230000004941 influx Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/106—Valve arrangements outside the borehole, e.g. kelly valves
Abstract
A method for controlling formation pressure during drilling includes pumping a drilling fluid through a drill string in a borehole, out a drill bit at the end of the drill string into an annular space. The drilling fluid is discharged from the annular space proximate the Earth's surface. At least one of a flow rate of the drilling fluid into the borehole and a fluid flow rate out of the annular space is measured. Pressure of the fluid in the annular space proximate the Earth's surface and pressure of the fluid proximate the bottom of the borehole are measured. Pressure of the fluid proximate the bottom of the borehole is estimated using the measured flow rate, annular space pressure and density of the drilling fluid. A warning signal is generated if difference between the estimated pressure and measured pressure exceeds a selected threshold.
Claims (9)
1 A method for determining existence of a well control event by controlling formation pressure during the drilling of a borehole through a subterranean formation, comprising:
selectively pumping a drilling fluid through a drill string extended into a borehole, out a drill bit at the bottom end of the drill string, and into an annular space between drill string and the borehole;
discharging the drilling fluid from the annular space proximate the Earth's surface;
selectively increasing annular space fluid pressure to maintain a selected fluid pressure proximate the bottom of the borehole by applying fluid pressure to the annular space, the selective increasing including controlling an aperture of an orifice functionally coupled to an outlet of the annular space;
monitoring the aperture of the orifice; and determining existence of a well control event when the aperture changes and the rate of the selective pumping remains substantially constant.
selectively pumping a drilling fluid through a drill string extended into a borehole, out a drill bit at the bottom end of the drill string, and into an annular space between drill string and the borehole;
discharging the drilling fluid from the annular space proximate the Earth's surface;
selectively increasing annular space fluid pressure to maintain a selected fluid pressure proximate the bottom of the borehole by applying fluid pressure to the annular space, the selective increasing including controlling an aperture of an orifice functionally coupled to an outlet of the annular space;
monitoring the aperture of the orifice; and determining existence of a well control event when the aperture changes and the rate of the selective pumping remains substantially constant.
2 The method of claim 1 wherein the well control event is determined to be an influx of fluid into the wellbore when the aperture changes due to an increase or decrease in the actual bottomhole pressure.
3 The method of claim 1 wherein the well control event is determined to be a loss of fluid from the wellbore when the aperture decreases due to a reduction in the actual bottomhole pressure.
4 A method for controlling formation pressure during the drilling of a borehole through a subterranean formation, comprising:
pumping a drilling fluid through a drill string extended into a borehole, out a drill bit at the bottom end of the drill string, and into an annular space between the drill string and the borehole;
discharging the drilling fluid from the annular space proximate the Earth's surface;
measuring at least one of a flow rate of the drilling fluid into the borehole and a fluid flow rate out of the annular space;
measuring a pressure of the fluid in the annular space proximate the Earth's surface and a pressure of the fluid proximate the bottom of the borehole;
estimating a pressure of the fluid proximate the bottom of the borehole using the measured flow rate, measured annular space pressure and a density of the drilling fluid; and generating a warning signal if a difference between the estimated pressure and the ineasured pressure exceeds a selected threshold.
pumping a drilling fluid through a drill string extended into a borehole, out a drill bit at the bottom end of the drill string, and into an annular space between the drill string and the borehole;
discharging the drilling fluid from the annular space proximate the Earth's surface;
measuring at least one of a flow rate of the drilling fluid into the borehole and a fluid flow rate out of the annular space;
measuring a pressure of the fluid in the annular space proximate the Earth's surface and a pressure of the fluid proximate the bottom of the borehole;
estimating a pressure of the fluid proximate the bottom of the borehole using the measured flow rate, measured annular space pressure and a density of the drilling fluid; and generating a warning signal if a difference between the estimated pressure and the ineasured pressure exceeds a selected threshold.
The method of claim 4 further comprising controlling an aperture of a choke disposed in a flow line through which the discharging the drilling fluid is performed such that the measured pressure and the estimated pressure substantially match.
6 The method of claim 4 wherein the flow rate of the drilling fluid into the borehole is measured.
7 The method of claim 4 wherein the flow rate out of the annular space is measured.
8 The method of claim 4 wherein a density of the fluid used as input to the estimating pressure is adjusted until the measured pressure and the estimated pressure substantially match.
9 The method of claim 4 further comprising selectively applying backpressure to the fluid being discharged to change the measured pressure until a value of the input fluid density has stabilized.
The method of claim 9 wherein the selectively applying backpressure comprises operating a controllable aperture orifice funtionally coupled to an outlet of the annular space.
The method of claim 9 wherein the selectively applying backpressure comprises operating a controllable aperture orifice funtionally coupled to an outlet of the annular space.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75631106P | 2006-01-05 | 2006-01-05 | |
| US60/756,311 | 2006-01-05 | ||
| PCT/US2007/000088 WO2007081711A2 (en) | 2006-01-05 | 2007-01-04 | Method for determining formation fluid entry into or drilling fluid loss from a borehole using a dynamic annular pressure control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2635097A1 true CA2635097A1 (en) | 2007-07-19 |
| CA2635097C CA2635097C (en) | 2011-08-09 |
Family
ID=38256879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2635097A Active CA2635097C (en) | 2006-01-05 | 2007-01-04 | Method for determining formation fluid entry into or drilling fluid loss from a borehole using a dynamic annular pressure control system |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US7562723B2 (en) |
| EP (1) | EP1969204A4 (en) |
| AU (1) | AU2007205225B2 (en) |
| BR (1) | BRPI0706315B1 (en) |
| CA (1) | CA2635097C (en) |
| EA (1) | EA015325B1 (en) |
| EG (1) | EG26269A (en) |
| MX (1) | MX2008008658A (en) |
| MY (1) | MY144145A (en) |
| NO (1) | NO343086B1 (en) |
| WO (1) | WO2007081711A2 (en) |
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-
2007
- 2007-01-04 CA CA2635097A patent/CA2635097C/en active Active
- 2007-01-04 WO PCT/US2007/000088 patent/WO2007081711A2/en active Application Filing
- 2007-01-04 US US11/649,567 patent/US7562723B2/en active Active
- 2007-01-04 EP EP07717755A patent/EP1969204A4/en not_active Withdrawn
- 2007-01-04 EA EA200870156A patent/EA015325B1/en not_active IP Right Cessation
- 2007-01-04 BR BRPI0706315-6A patent/BRPI0706315B1/en active IP Right Grant
- 2007-01-04 MY MYPI20082462A patent/MY144145A/en unknown
- 2007-01-04 AU AU2007205225A patent/AU2007205225B2/en not_active Ceased
- 2007-01-04 MX MX2008008658A patent/MX2008008658A/en active IP Right Grant
-
2008
- 2008-07-03 EG EG2008071134A patent/EG26269A/en active
- 2008-08-05 NO NO20083419A patent/NO343086B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EG26269A (en) | 2013-06-05 |
| MY144145A (en) | 2011-08-15 |
| WO2007081711A3 (en) | 2008-02-21 |
| BRPI0706315B1 (en) | 2018-02-06 |
| NO20083419L (en) | 2008-08-05 |
| US20070151762A1 (en) | 2007-07-05 |
| NO343086B1 (en) | 2018-10-29 |
| US7562723B2 (en) | 2009-07-21 |
| BRPI0706315A2 (en) | 2011-03-22 |
| EA015325B1 (en) | 2011-06-30 |
| EA200870156A1 (en) | 2008-12-30 |
| AU2007205225A1 (en) | 2007-07-19 |
| MX2008008658A (en) | 2008-11-28 |
| EP1969204A4 (en) | 2012-12-26 |
| AU2007205225B2 (en) | 2010-11-11 |
| CA2635097C (en) | 2011-08-09 |
| WO2007081711A2 (en) | 2007-07-19 |
| EP1969204A2 (en) | 2008-09-17 |
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