CA2494391A1 - Methods of improving heavy oil production - Google Patents

Methods of improving heavy oil production Download PDF

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Publication number
CA2494391A1
CA2494391A1 CA002494391A CA2494391A CA2494391A1 CA 2494391 A1 CA2494391 A1 CA 2494391A1 CA 002494391 A CA002494391 A CA 002494391A CA 2494391 A CA2494391 A CA 2494391A CA 2494391 A1 CA2494391 A1 CA 2494391A1
Authority
CA
Canada
Prior art keywords
well
reservoir
solvent fluid
fluid
solvent
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
Application number
CA002494391A
Other languages
French (fr)
Other versions
CA2494391C (en
Inventor
Bernard Compton Chung
Mintu Bose
Stewart Allan Morton
Kenneth James Elkow
Ed Erlendson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CNOOC Petroleum North America ULC
Original Assignee
Nexen Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nexen Inc filed Critical Nexen Inc
Priority to CA2494391A priority Critical patent/CA2494391C/en
Priority to US11/049,294 priority patent/US7527096B2/en
Publication of CA2494391A1 publication Critical patent/CA2494391A1/en
Priority to US11/735,261 priority patent/US7717175B2/en
Application granted granted Critical
Publication of CA2494391C publication Critical patent/CA2494391C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/2406—Steam assisted gravity drainage [SAGD]
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/2406—Steam assisted gravity drainage [SAGD]
    • E21B43/2408—SAGD in combination with other methods

Abstract

The invention provides an improved method for producing heavy oil or bitumen in a reservoir. The invention involves directing the formation of a solvent fluid chamber through the combination of directed solvent fluid injection and production at combinations of horizontal and/or vertical injection wells so as to increase the recovery of heavy oil or bitumen in a reservoir.

Claims (30)

1. A method for extracting hydrocarbons from in a reservoir containing hydrocarbons having an array of wells disposed therein, the method comprising:
(a) injecting a solvent fluid into the reservoir through a first well in the array;
(b) producing reservoir fluid from a second well in the array, the second well offset from the first well, to drive the formation of a solvent fluid chamber between the first and the second well;
(c) injecting the solvent fluid into the solvent fluid chamber through at least one of the first and second wells to expand the solvent fluid chamber within the reservoir; and (d) producing reservoir fluid from at least one well in the array to direct the expansion of the solvent fluid chamber within the reservoir.
2. The method of claim 1 wherein the solvent fluid is injected into the solvent fluid chamber in step (c) by the second well and the reservoir fluid is produced in step (d) by the first well.
3. The method of claim 2 wherein the first and second wells are horizontal wells and the first and second wells are vertically and laterally offset.
4. The method of claim 1 wherein the wells of the array are selected from the group consisting of horizontal wells, vertical wells and mixtures thereof.
5. The method of claim 4 wherein the first and second well are vertical wells.
6. The method of claim 5 wherein the at least one well of step (d) is a third well in the array.
7. The method of claim 6 wherein the third well is a vertical well.
8. The method of claim 6 wherein the at least one well of step (d) is a horizontal well.
9. A method for extracting hydrocarbons from reservoir containing hydrocarbons, the method comprising:
(a) injecting a solvent fluid into the reservoir through a first well disposed in the reservoir;
(b) producing reservoir fluid from a second well disposed in the reservoir and offset from the first well to create a pressure differential between the first and second well, the pressure differential being sufficient to overcome the gravity force of the solvent fluid so as to drive the formation of a solvent fluid chamber towards the second well.
10. The method of claim 9 wherein the solvent fluid chamber is delimited by vertically inclined upper and lower boundaries.
11. The method of claim 10 wherein the upper and lower boundaries converge towards the second well.
12. The method of claim 11 further comprising:
(c) injecting the solvent fluid into the solvent fluid chamber through the second well to expand the solvent fluid chamber within the reservoir; and (d) producing reservoir fluid from the first well.
13. A method for extracting hydrocarbons from a reservoir containing hydrocarbons, the method comprising:
(a) injecting a solvent fluid into the reservoir through a first well disposed in the deposit;
(b) producing reservoir fluid from a second well disposed in the reservoir and offset from the first well so as to drive the formation of a solvent fluid chamber towards the second well until solvent fluid breakthrough occurs at the second well;
(c) injecting the solvent fluid into the solvent fluid chamber through the second well to increase the surface area of the solvent fluid chamber; and (d) producing reservoir fluid in the solvent fluid chamber from the first well.
14. The method of claim 13 wherein the first and second wells are horizontal.
15. The method of claim 14 wherein the solvent fluid chamber is delimited by vertically inclined upper and lower boundaries.
16. The method of claim 15 wherein the upper and lower boundaries converge towards the second well.
17. The method of claim 14 wherein the solvent fluid is a liquid, gas or a mixture thereof and the liquid or gas is selected from the group consisting of steam, methane, butane, ethane, propane, pentanes, hexanes, heptanes, and CO2 and mixtures thereof.
18. The method of claim 17 wherein the solvent fluid further comprises a non-condensible gas.
19. The method of claim 18 wherein the hydrocarbons comprise heavy oil and/or bitumen.
20. The method of claim 19 wherein the oil/solvent fluid rate is increased in step (c) by increasing gravity induced counter-flow mixing of the solvent fluid and the hydrocarbons.
21. The method of claim 20 wherein the producing of reservoir fluid in step (b) is done concurrently with the solvent fluid injection of step (a).
22. The method of claim 21 wherein the producing of reservoir fluid in step (d) is done concurrently with the solvent fluid injection of step (c).
23. The method of claim 22 wherein the solvent fluid injection of step (a) or step (c) may be greater than 14,000 standard cubic meters per day.
24. The method of claim 23 wherein a pressure gradient is established between the first and the second well in step (b) is greater than 100 kPa.
25. The method of claim 13 wherein the steps (a) to (d) are repeated at least once.
26. The method of claim 13 wherein steps (c) and (d) are repeated at least once.
27. The method of claim 13 wherein the first and second wells are vertically, horizontally or laterally offset.
28. The method of claim 13 wherein the reservoir fluid comprises production oil.
29. A method for extracting hydrocarbons from a reservoir containing hydrocarbons, the method comprising:
(a) injecting a solvent fluid into the reservoir through a first vertical well disposed in the deposit;
(b) producing reservoir fluid from a second vertical well disposed in the reservoir offset from the first vertical well so as to drive the formation of a first solvent fluid chamber towards the second vertical well until solvent fluid breakthrough occurs at the second vertical well;
(c) injecting the solvent fluid into the reservoir through a first horizontal well disposed in the deposit and offset from the first and second vertical wells so as to create a second solvent fluid chamber;
(d) producing reservoir fluid from the horizontal well and injecting solvent fluid into the first solvent chamber so as to drive the first solvent fluid chamber towards the second solvent fluid chamber.
30. A method for extracting hydrocarbons from reservoir containing hydrocarbons, the method comprising:
(a) injecting a solvent fluid into the reservoir through a first well disposed in the reservoir;

(b) producing reservoir fluid from a second well disposed in the reservoir and offset from the first well to create a direct solvent fluid channel between the first and second well;
(c) injecting solvent fluid into the reservoir from at least one of the first and second wells and producing reservoir fluid from at least one of the first and second wells to create at least two solvent fluid chambers, each of the solvent fluid chambers having "oil/solvent fluid" mixing and "solvent fluid/oil mixing".
CA2494391A 2005-01-26 2005-01-26 Methods of improving heavy oil production Active CA2494391C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2494391A CA2494391C (en) 2005-01-26 2005-01-26 Methods of improving heavy oil production
US11/049,294 US7527096B2 (en) 2005-01-26 2005-02-03 Methods of improving heavy oil production
US11/735,261 US7717175B2 (en) 2005-01-26 2007-04-13 Methods of improving heavy oil production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2494391A CA2494391C (en) 2005-01-26 2005-01-26 Methods of improving heavy oil production

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CA2494391A1 true CA2494391A1 (en) 2006-07-26
CA2494391C CA2494391C (en) 2010-06-29

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CA (1) CA2494391C (en)

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US7527096B2 (en) 2009-05-05
US20060162922A1 (en) 2006-07-27

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