Classifications

• • 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
  • 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
• • 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
  • 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 OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK 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. optimising the spacing of wells

Definitions

• Athabasca Oil Sands is one of the largest oil deposits in the world. It contains 2.75 trillion barrels of bitumen resources, including carbonate deposits (Butler, R. Thermal Recovery of Oil and Bitumen, Prentice-Hall, 1991). The recoverable resource (excluding carbonate deposits) is currently estimated at about 170 billion barrels. (CAPP, The Facts on Oil Sands, Nov 2010). 20% of these resources is recoverable by mining and the other 80% is recoverable by in-situ Enhanced Oil Recovery (EOR) (CAPP, 2010).
• EOR Enhanced Oil Recovery
• SAGD steam-assisted gravity drainage
• Table 1 provides typical production of leading producers in the industry based on SAGD.
• SAGD does have some limitations. Studies indicate that the economical limit for steam transportation, using an insulated pipeline, is about 10 to 15 km (Finn, A., Integration of Nuclear Power with Oil Sands Extraction Projects in Canada, MIT Thesis, June 2007), (Energy Alberta Corporation, Nuclear Energy: Hedging Option for the Oil Sands, CHUA, presentation Nov. 2, 2006), ( PAC, Clean Bitumen Technology Action Plan, April 201 1).
• bitumen production is limited because of the following SAGD central plant characteristics: 1) plant life is limited to 40 years at 90% average availability; 2) the available land for SAGD is 30% of the total (either due to reservoir quality, surface access or lease ownership issues); and 3) the average SAGD pattern size is 1000m x l OOmth with an average pattern bitumen recovery of 1.5 million barrels (bbls) (41 1 bbls/day for 10 years).
• the maximum size for a self-contained bitumen supply, without any satellite plants, based on the above assumptions is 108,000 bbls/day.
• the maximum-sized SAGD central plant will recover 1 .4 billion barrels of bitumen. In order to fully recover the recoverable resources, there would be a need for about 100 central SAGD maximum sized plants and about 100,000 average SAGD patterns.
• bitumen satellite plant A bitumen satellite plant is defined as a satellite plant for bitumen production that is "tied" to a central plant by a pipeline corridor.
• the pipeline corridor supplies a significant amount of input feeds from a central SAGD plant to the satellite SAGD plant, and it returns bitumen (or bitumen and diluent, or bitumen and water) to the central plant.
• bitumen and water produced fluid mix
• Push Water Systems - bitumen and water may be conveyed together without chemical additions in a gathering line system (Integra Engineering, Pushwater Systems Extend Heavy Oil Collection, 201 1). The mixture may be thought of as a bulk oil/water (O/W) emulsion or blob flow. Commercial systems operate at distances up to 12 km (Integra (201 1)).
• Oil-in-Water Emulsions (O/W) — these emulsions may be created and stabilized by adding shear and chemicals to produced fluids. O/W emulsions may be stable and pumped with as low as 30% (v/v) continuous-phase water (Wikipedia, Orimulsion, 201 1 ), (Xinhua Economic News, China's First Orimulsion Pipeline Comes on Steam, Nov. 7 2006), (Brennan, J.R, Screw Pumps Provide High Efficiency in Transport of Orinocco Bitumen, P and G Journal, March 1995), (Stockwell, A., et al., Transoil Technology for Heavy Oil Transportation: Results of Field Trials at Wolf Lake, SPE 18362-MS, Oct. 1988).
• Diluent and Bitumen and Water mixture - diluent may be added to the produced fluid mix.
• One advantage of this is that the oil phase has reduced viscosity, so that if the conveyance pipeline is shut down in cold weather, the oil phase will not block a restart.
• the disadvantage is that the water concentration is reduced in the mix, so that push water flow and emulsion flow may be more difficult.
• the SAGD satellite plant described above is desirable for the following reasons:
• the SAGD remote, satellite plant has more productive reservoirs.
• the operator owns the land rights at the SAGD satellite plant.
• the operator wishes to start another SAGD satellite plant that may eventually turn into a SAGD central self-sufficient plant.
• Stand-alone SAGD satellite plant can be operated using some (most) of the SAGD central plant staff, thus saving operating expenses.
• Process reliability may be improved.
• bitumen is defined as an in situ hydrocarbon with ⁇ 10 API gravity and > 100,000 cp. in-situ viscosity.
• steam and oxygen are injected separately and continuously.
• the steam and oxygen rates are controlled to meet oxygen/steam (v/v) ratio targets and to meet energy injection targets.
• the produced gas removal rate is adjusted to control pattern pressures and to control and/or improve oxygen conformance.
• the produced fluid (bitumen and water) production rate uses steam trap control, assuming the region around the production well is steam-saturated.
• SAGDOX is labeled as SAGDOX (A), where A is the (v/v) percent of oxygen in the oxygen and steam injectant gas).
• A is the (v/v) percent of oxygen in the oxygen and steam injectant gas.
• satellite plant, satellite facility, and satellite site are used interchangeably.
• central plant, central facility, and central site are used interchangeably.
• the present invention relates to a satellite production process for bitumen recovery that either uses SAGDOX or converts an existing SAGD satellite plant to a SAGDOX satellite plant.
• SAGDOX is a bitumen enhanced oil recovery (EOR) process.
• the process may be considered as a hybrid of SAGD and in-situ combustion (ISC).
• SAGDOX is described, in detail, in US2013/0098603. While similar to SAGD, SAGDOX incorporates extra vertical wells (or segregated injection/production) to inject oxygen into the system and to remove non-condensable combustion gases from the system. SAGDOX adds energy to the bitumen reservoir by direct steam injection and oxygen combustion of residual bitumen. Many of the advantages of the present invention stem from the properties of oxygen versus steam for adding heat to the reservoir.
• a SAGDOX satellite system for recovering hydrocarbons, the system comprises a central SAGDOX site, at least one SAGDOX satellite site remote said central SAGDOX site, and a pipeline corridor for communication between the central SAGDOX site and the SAGDOX satellite site, preferably the distance between the central site and satellite site ranges from 9 km to 160 km, more preferably 10 km to 100 km, wherein the satellite system is designed to recover hydrocarbons using a SAGDOX process at the SAGDOX satellite site and transfer recovered hydrocarbons to the central SAGDOX site.
• the central SAGDOX site comprises:
• the SAGDOX satellite site comprises:
• the pipeline corridor comprises:
• a natural gas supply pipe to supply the SAGDOX satellite site, and a bitumen and water recovery pipe.
• the oxygen, water and natural gas are supplied to the SAGDOX satellite site; oxygen with generated steam is injected into an underground formation; and recovered from the underground formation bitumen emulsion, preferably O/W emulsions, are pumped back to the central site, then the bitumen is separated from the water, and treated water is sent back to the satellite site for steam generation.
• bitumen emulsion is further combined with a chemical stabilizer or diluent at the SAGDOX satellite site, and the pipeline corridor further comprises a pipe for delivering said chemical stabilizer or diluent to the SAGDOX satellite site.
• the SAGDOX satellite site further comprises a vent gas treating unit for sequestering C0 2 and/or other produced gases.
• each central SAGDOX plant has more than one SAGDOX satellite plants attached to it with one or more pipeline corridors.
• the oxygen and generated steam are injected into said underground formation in one of the following ways: 1) the oxygen with generated steam are simultaneously injected into the same well; 2) the oxygen with generated steam are simultaneously injected into several wells; 3) or the oxygen and generated steam are separately injected into separated wells for steam and oxygen and the mixture takes place in the underground formation.
• oxygen in the oxygen and generated steam mixture has a concentration in range of 5% to 50 % (v/v), preferably 10% to 40% (v/v), more preferably the concentration is about 35% (v/v).
• a process of upgrading an existing SAGD facility by transforming it into an SAGDOX satellite system comprising: installation of an oxygen generation unit at the central SAGD facility, providing at least one remotely located SAGDOX satellite site, preferably a plurality of SAGDOX satellite sites, and providing at least one pipeline corridor, preferably a plurality of pipeline corridors, between the central SAGD facility and the SAGDOX satellite site.
• said pipeline corridor further comprising additional pipelines for oxygen supply, produced water and natural gas supply; thus increasing the operational area of the original facility for bitumen recovery by minimizing capital cost.
• a process for recovering bitumen from a satellite bitumen production site and delivering bitumen to a central facility whereby:
• the satellite bitumen production site is remote said central facility, preferably said satellite bitumen production site is located more than 10 km from the central facility,
• a pipeline corridor is provided for linking the satellite bitumen production site and the central facility, preferably said corridor further comprises at least one pipeline to provide treated water, suitable for boiler use, from the central site; at least one pipeline to provide oxygen gas from the central facility to the satellite bitumen production site, for SAGDOX; and at least one pipeline to provide produced fluids (bitumen and water) to the central facility recovered from the satellite bitumen production site.
• the process used for recovering bitumen from a satellite bitumen production site is SAGDOX as described herein.
• the produced fluids are conveyed from the satellite bitumen production site to the central facility in a push-water system.
• the produced fluids are conveyed to the central plant as a stabilized emulsion.
• said stabilized emulsion comprises a chemical stabilizer, such as ethoxylated nonylphenol, preferably added to the produced fluids (bitumen and water) at the satellite bitumen production site.
• a diluent is blended with the produced fluids (water and bitumen) for transport to the central facility.
• natural gas or fuel gas is also provided to the satellite bitumen production site, from the central facility by the pipeline corridor, for use as a boiler fuel.
• electricity is also transported from the central facility to/from the satellite bitumen recovery site.
• a produced gas (C0 2 ) pipeline is added to convey SAGDOX vent gas from the satellite bitumen recovery site to the central facility.
• an existing SAGD satellite bitumen recovery site with existing steam capacity is converted to a SAGDOX satellite site, as defined herein, utilizing existing steam capacity at the SAGD satellite bitumen recovery site.
• produced water is separated at the satellite bitumen recovery site, preferably this water is either treated for boiler use or disposed of on-site, wherein the diluted bitumen, is conveyed back to the central facility generally free from excess water.
• a SAGDOX production satellite plant has the following advantages:
• the SAGDOX satellite plant is greater than 9 km, more preferably 15km, distance from SAGDOX central plant because oxygen can be economically pipelined for approximately 100 miles. This is more than 10 times steam's limit of approx. 10 km.
• SAGDOX satellite site reduces capital expenditures at the satellite site (greenfield) for the pipeline corridor and for the overall project. Most of the expenditures for major process elements are at the central facility. Specifically, pipeline corridor costs for SAGDOX are 22% less; boiler costs can be reduced by 85%.
• vent gas mostly C0 2
• emissions per unit bitumen produced are significantly reduced.
• the steam and oxygen mixture has a preferred oxygen concentration range (5 to 50% (v/v))
• This preferred range for SAGDOX has minimum and maximum oxygen/steam ratios, with the following rationale:
• the minimum oxygen/steam ratio is 0.05 (v/v) (oxygen concentration of about 5%) Below this concentration, the following occurs:
• HTO combustion starts to become unstable. It becomes more difficult to attain minimum oxygen flux rates to sustain HTO, particularly for a mature SAGDOX process where the combustion front is far away from the injector.
• the maximum oxygen/steam ratio is 1.00 (v/v) (oxygen concentration of
• oxygen/steam ratios is 0.05 to 1.00 (v/v) corresponding to a concentration range of 5 to 50% (v/v) of oxygen in the mix. 7.
• Total capex costs are also less. Per unit energy delivered to the reservoir, oxygen capex is much less than steam and water treating capex.
• the SAGDOX process of the present invention produces an off-gas in one embodiment that is almost substantially pure C0 2 In one embodiment, if this off-gas is captured for sequestration, C0 2 emissions in SAGDOX can be much less than SAGD.
• SAGDOX needs more wells than SAGD - to inject oxygen gas and to remove produced non-condensable gases.
• SAGDOX allows longer horizontal wells to be drilled, by reducing hydraulic limits on horizontal well lengths. So, on a per-unit- volume-of-reservoir basis, SAGDOX well costs can be comparable to or less than SAGD well costs.
• SAGDOX opex costs are less than SAGD.
• the wells can be operated longer and reservoirs increased.
• Figure 1 depicts a typical SAGDOX process
• Figure 2 depicts a 10KBD (thousand barrels per day) Satellite SAGD
• Figure 3 depicts a 1 QKBD Satellite SAGDOX (10)
• Figure 4 depicts a 10KBD Satellite SAGDOX (9)
• Figure 5 depicts a 10KBD Satellite SAGDOX (20)
• Figure 6 depicts a 10KBD Satellite SAGDOX (35)
• Figure 7 depicts a 10KBD Satellite SAGDOX (50)
• Figure 8 depicts an Expansion to an Existing 10KBD SAGD Satellite SAGDOX (5) Increment
• Figure 9 depicts an Expansion to an Existing 10KBD SAGD Satellite SAGDOX (9) Increment
• Figure 10 depicts an Expansion to an Existing 10 KBD SAGD Satellite SAGDOX (20) Increment
• Figure 1 1 depicts an Expansion to an Existing 10 KBD SAGD Satellite SAGDOX (35) Increment
• Figure 12 depicts an Expansion to an Existing 10 KBD SAGD Satellite SAGDOX (50) Increment
• Figure 13 depicts Viscosity versus % disperse phase of O/W Emulsions
• Figure 14 depicts a central SAGDOX plant connected to more than one satellite SAGDOX plant
• FIG. 1 a typical geometry of the SAGDOX system of the present invention is depicted. As can be seen, oxygen 5 is added during the SAGD process through the steam pipeline 1 and the effluents include produced gas 4 as well as bitumen and water 2.
• a SAGD system in which a SAGD central plant is connected to a SAGD satellite site.
• a set-up consists of pipelines running from the base plant 10 to the satellite site 20.
• a series of pipelines connect the base plant 10 with the satellite site 20.
• treated water is provided to satellite site 20 via pipeline 30.
• Diluent is provided to satellite site 20 via pipeline 40.
• Natural gas fuel to fuel the boiler in the satellite site is provided to the satellite site via pipeline 50.
• pipeline 60 is provided to transport the mixture of diluent + produced water + bitumen from the satellite site 20 to the central plant 10.
• 33.7 KBD of treated water 30 is needed for the SAGD operation at the satellite site (namely for steam production);
• Boiler C0 2 is 14.8 MMSCFD; 14.8 MMSCFD of natural gas fuel 50 is needed to fuel the boiler; 3.37 KBD of make-up water 75 is needed at the base plant; and diluent + produced water + bitumen 120 product pipeline volume of 53.7 KBD.
• characteristics include: 1) the ETOR is 1.8; 2) SOR is 3.37; 3) the OTSG is 80% efficient; 4) steam is at 1000 BTU/lb; 5) 90% of produced water that goes to central plant is recycled as steam; 6) 10KBD bitumen 95 increment; 7) all steam injected equals produced water; and 8) natural gas fuel at 1000 BTU/SCF; and 9) diluent/bitumen ratio equal 1.0.
• FIG. 3 there is depicted a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite site 20.
• One major difference between the system of Figure 1 and the system of Figure 2 is the additional Oxygen pipeline 45 from the base plant 10 to feed oxygen to the SAGDOX satellite site 20.
• the percentage of oxygen in the steam/oxygen mixture is 5 whereas in the system of Figure 1 there is no oxygen.
• 8.56 MMSCFD or 327 tonnes/d of oxygen 45 is delivered to the SAGDOX satellite plant 20; vent pure C0 2 105 is 8.56 MMSCFD; natural gas fuel 51 from the base plant 10 to the satellite is 9.6 MMSCFD; Diluent + produce water + bitumen 121 is 42.0 KBD; treated water 31 is 22.0 BD; Make up water 76 is 2.2KBD; disposal water 86 is 2.2KBD; ASU electricity 60 is 4.0MW versus zero in Figure 2; and boiler C0 2 1 1 1 is 9.6 MMSCFD.
• characteristics include: 1) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb.; 4) oxygen is at 480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) 10KBD bitumen 95 increment; 7) all steam injected equals produced water; 8) no extra water; 9) 292.5 kWh/tonne Oxygen (95-97% purity); 10) natural gas fuel at 1000 BTU/SCF; 1 1) diluent/bitumen ratio equal 1.0; and 12) pure carbon dioxide vent gas equals the oxygen used.
• FIG. 4 there is depicted a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite plant 20.
• the percentage of oxygen in the steam/oxygen mixture is 9.
• 12.3 MMSCFD or 421 tonnes/d of oxygen 46 is delivered to the satellite; vent pure C0 2 106 is 12.3 MMSCFD; natural gas fuel 52 from the central plant 10 to the satellite plant is 7.38 MMSCFD; Diluent + produce water + bitumen 122 is 36.9 KBD; treated water 32 is 16.9 KBD; Make up water 77 is 1.7 KBD; disposal water 87 is 1.7 KBD; ASU electricity 61 is 5.1 MW; and boiler C0 2 1 12 is 7.38 MMSCFD.
• characteristics include: 1) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb; 4) Oxygen is at 480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) 10KBD bitumen 95 increment; 7) all steam injected equals produced water; 8) no extra water; 9) 292.5 kWh/tonne Oxygen (95-97% purity); 10) natural gas fuel at 1000 BTU/SCF; 1 1 ) diluent/bitumen ratio equal 1.0; and 12) pure carbon dioxide vent gas equals the oxygen used.
• FIG. 5 there is depicted a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite plant 20.
• the percentage of oxygen in the steam/oxygen mixture is 20.
• 17.6 MMSCFD or 672 tonnes/d of oxygen 47 is delivered to the satellite; vent pure C0 2 107i s 17.6 MMSCFD; natural gas fuel 53 from the base plant 10 to the satellite is 4.17 MMSCFD; Diluent + produce water + bitumen 123 is 29.54 KBD; treated water 33 is 9.54 KBD; Make up water 78 is 0.95 KBD; disposal water 88 is 0.95 KBD; ASU electricity 62 is 8.1 MW; and boiler C0 2 1 13 is 4.17 MMSCFD.
• characteristic include: 1) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb; 4) oxygen is at480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) 10KBD bitumen 95 increment; 7) all steam injected equals produced water; 8) No extra water; 9) 292.5 kWh/tonne Oxygen (95-97% purity); 10) natural gas fuel at 1000 BTU/SCF; 1 1) diluent/bitumen ratio equal 1.0; and 12) pure carbon dioxide vent gas equals the oxygen used.
• FIG. 6 there is depicted a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite plant 20.
• the percentage of oxygen in the steam/oxygen mixture is 35.
• 20.8 MMSCFD or 794 tonnes/d of oxygen 48 is delivered to the satellite; vent pure C0 2 108 is 20.8 MMSCFD; natural gas fuel 54 from the central plant 10 to the satellite plant 20 is 2.28 MMSCFD; Diluent + produce water + bitumen 124 is 25.2 KBD; treated water 34 is 5.2 KBD; Make up water 79 is 0.5 KBD; disposal water 89 is 0.5 KBD; ASU electricity 63 is 9.7 MW; and boiler C0 2 1 14 is 2.28 MMSCFD.
• characteristics include: 1) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb 4) oxygen is at480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) 10KBD bitumen 95 increment; 7) all steam injected equals produced water; 8) no extra water; 9) 292.5 kWh/tonne Oxygen (95- 97% purity); 10) natural gas fuel at 1000 BTU/SCF; 1 1) diluent/bitumen ratio equal 1.0; and 12) pure carbon dioxide vent gas equals the oxygen used.
• FIG. 7 there is depicted a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite plant 20.
• the percentage of oxygen in the steam/oxygen mixture is 50.
• 22.4 MMSCFD or 855 tonnes/d of oxygen 49 is delivered to the satellite 20; vent pure C0 2 109 is 22.4 MMSCFD; natural gas fuel 55 from the central plant 10 to the satellite 20 is 1.32 MMSCFD; Diluent + produce water + bitumen 125 is 23.0 KBD; treated water 35 is 3.0 KBD; Make up water 80 is 0.3 KBD; disposal water 90 is 0.3 KBD; ASU electricity 64 is 10.4 MW; and boiler C0 2 1 15 is 1.32 MMSCFD.
• characteristics include: 1) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb 4) oxygen is at480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) 10KBD bitumen 95 increment; 7) all steam injected equals produced water; 8) no extra water; 9) 292.5 kWh/tonne Oxygen (95- 97% purity); 10) natural gas fuel at 1000 BTU/SCF; 1 1) diluent/bitumen ratio equal 1.0; and 12) pure carbon dioxide vent gas equals the oxygen used.
• FIG 8 there is depicted an expansion of an existing 10KBD SAGD system to a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite plant 20 and all the steam capacity at the existing satellite is used, which means no natural gas fuel is required to be pipelined to the satellite.
• the percentage of oxygen in the steam/oxygen mixture is 5.
• 13.13 MMSCFD of oxygen 140 is delivered to the satellite; vent pure C0 2 160 is 13.13 MMSCFD; diluent 41 from the central plant 10 to the satellite plant 20 is 5.34 KBD; Diluent + produce water + bitumen 126 is 16.02 KBD; incremental bitumen 96 is 5.34 KBD; treated water is 0.0 KBD; Make up water 35 is 0.0 KBD; disposal water 91 is 0.0 KBD; ASU electricity 65 is 6.1 1 MW; and boiler C0 2 1 16 is 0.0 MMSCFD.
• characteristics include: 1 ) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb; 4) oxygen is at 480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) all steam injected equals produced water; 7) No extra water; 8) 292.5 kWh/tonne Oxygen (95-97% purity); 9) natural gas fuel at 1000 BTU/SCF; 10) diluent/bitumen ratio equal 1.0; 10) pure carbon dioxide vent gas equals the oxygen used; and 1 1) all steam capacity at existing satellite is used.
• FIG. 9 there is depicted an expansion of an existing 10KBD SAGD system to a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite plant 20 and all the steam capacity at the existing satellite is used, which means no natural gas fuel is required to be pipelined to the satellite plant 20.
• the percentage of oxygen in the steam/oxygen mixture is 9.
• 24.6 MMSCFD of oxygen 141 is delivered to the satellite 20; vent pure C0 2 161 is 24.6 MMSCFD; diluent 40 from the central plant 10 to the satellite plant 20 is 10.0 KBD; Diluent + produce water + bitumen 127 is 30.0 KBD; incremental bitumen 95 is 10.0 KBD; treated water 35 is 0.0 KBD; Make up water is 81 0.0 KBD; disposal water 91 is 0.0 KBD; ASU electricity 66 is 1 1.5 MW; and boiler C0 2 1 16 is 0.0 MMSCFD.
• characteristics include: 1) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb; 4) oxygen is at 480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) all steam injected equals produced water; 7) No extra water; 8) 292.5 kWh/tonne Oxygen (95-97% purity); 9) natural gas fuel at 1000 BTU/SCF; 10) diluent/bitumen ratio equal 1.0; 10) pure carbon dioxide vent gas equals the oxygen used; and 1 1) all steam capacity at existing satellite is used.
• FIG. 10 there is depicted an expansion of an existing 10KBD SAGD system to a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite site 20 and all the steam capacity at the existing satellite is used, which means no natural gas fuel is required to be pipelined to the satellite.
• the percentage of oxygen in the steam/oxygen mixture is 20.
• MMSCFD of oxygen 142 is delivered to the satellite; vent pure C0 2 162 is 62.2 MMSCFD; diluent 42 from the central plant 10 to the satellite plant 20 is 25.34 KBD; Diluent + produce water + bitumen 128 is 76.02 KBD; incremental bitumen 97 is 25.34 KBD; treated water 35 is 0.0 KBD; Make up water 81 is 0.0 KBD; disposal water 91 is 0.0 KBD; ASU electricity 67 is 29.0 MW; and boiler C0 2 1 16i s 0.0 MMSCFD
• characteristics include: 1) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb; 4) oxygen is at 480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) all steam injected equals produced water; 7) No extra water; 8) 292.5 kWh/tonne Oxygen (95-97%
• FIG. 1 there is depicted an expansion of an existing 10KBD SAGD system to a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite plant 20 and all the steam capacity at the existing satellite is used, which means no natural gas fuel is required to be pipelined to the satellite.
• the percentage of oxygen in the steam/oxygen mixture is 35.
• 134.2 MMSCFD of oxygen 143 is delivered to the satellite plant 20; vent pure C0 2 163 is 134.2 MMSCFD; diluent 43 from the central plant 10 to the satellite plant 20 is 54.52 KBD; Diluent + produce water + bitumen 129 is 163.56 KBD; incremental bitumen 98 is 54.52 KBD; treated water 35 is 0.0 KBD; Make up water 81 is 0.0 KBD; disposal water 91 is 0.0 KBD; ASU electricity 68 is 62.5 MW; and boiler C0 2 1 16 is 0.0 MMSCFD
• characteristics include: 1 ) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb; 4) oxygen is at 480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) all steam injected equals produced water; 7) No extra water; 8) 292.5 kWh/tonne Oxygen (95-97%
• FIG 12 there is depicted an expansion of an existing 10KBD SAGD system to a SAGDOX satellite system of the present invention wherein central plant 10 is connected to a SAGDOX satellite plant 20 and all the steam capacity at the existing satellite is used, which means no natural gas fuel is required to be pipelined to the satellite.
• the percentage of oxygen in the steam/oxygen mixture is 50.
• 248.9 MMSCFD of oxygen 144 is delivered to the satellite plant 20; vent pure C0 2 164 is 248.9 MMSCFD; diluent 44 from the central plant 10 to the satellite 20 is 101.1 1 KBD; Diluent + produce water + bitumen 130 is 303.3 KBD; incremental bitumen 98 is 101.1 1 KBD; treated water 35 is 0.0 KBD; Make up water 81 is 0.0 KBD; disposal water 91 is 0.0 KBD; ASU electricity 68 is 1 15.9 MW; and boiler C0 2 1 16 is 0.0 MMSCFD.
• characteristics include: 1) the ETOR is 1.8; 2) the OTSG is 80% efficient; 3) steam is at 1000 BTU/lb; 4) oxygen is at 480 BTU/SCF; 5) 90% of produced water that goes to central plant is recycled as steam; 6) all steam injected equals produced water; 7) No extra water; 8) 292.5 kWh/tonne Oxygen (95-97% purity); 9) natural gas fuel at 1000 BTU/SCF; 10) diluent/bitumen ratio equal 1.0; 10) pure carbon dioxide vent gas equals the oxygen used; and 1 1) all steam capacity at existing satellite is used.
• a pipeline corridor connects the SAGDOX central plant 10 to each SAGDOX satellite plant 20, allowing for communication between the central SAGDOX plant 10 and the SAGDOX satellite plant 20.
• Table 2 provides the typical injection gas properties of SAGDOX for the different oxygen concentrations in steam and oxygen mixtures discussed above, according the present invention.
• SAGDOX (35) is the preferred embodiment of the process.
• SAGDOX (35) is depicted in Figure 6 with the following properties:
• the satellite plant is more than 10 km from the central plant, otherwise it would be economic to integrate the satellite and supply steam from a central site.
• the pipeline corridor, between the satellite site and the central plant site should contain the following fluids pipelines:
• Fuel gas may be available from an alternate source, such as local supplies from pipelines or gas wells.
• the pipeline corridor may also contain the following fluid pipelines:
• the cost of the pipeline corridor for SAGDOX satellites is less than SAGD satellites in all embodiments.
• Table 7 summarizes diameters and cumulative diameters for each case assuming a 5 ft/sec velocity (3.4 mph) for liquids and 50 ft/sec for gases at 500 psia (this is within the safe operating region for oxygen in carbon steel pipelines (Sarathi, P.S., In- Situ Combustion Handbook, DOE, 1996).
• SAGDOX 35
• the capital cost of the pipeline corridor is 22% less than the cost for the SAGD case.
• Table 1 1 highlights a SAGDOX advantage as well. If we pipeline an O/W emulsion from the satellite plant to the central plant, rather than an oil and diluent and water mix, the advantage of the SAGDOX satellite c/w SAGD is even more pronounced. Even further, assuming a 2000 tonne/day ASU oxygen train, at the central plant, to capture the economy-of-scale for oxygen production, Table 4 shows the minimum satellite project size to capture these savings. The size varies from 61 KBD for SAGDOX (5) to 23 KBD for SAGDOX (50). For our preferred case, SAGDOX (35), the minimum satellite size is 25 KBD.
• the option with the minimum capex at the satellite site and for the satellite pipeline corridor includes the following elements:
• the SAGDOX option for a new satellite plant has at least one additional pipeline compared to SAGD - the oxygen line to deliver oxygen to the satellite site. But, other lines can have significant reduced capacity (Figures 2 to 7). Table 6 summarizes the individual volumes for each SAGD and SAGDOX case for a 10 KBD satellite plant. SAGDOX, for all cases, has a reduced liquids capacity but an increased gas capacity. If we are expanding an existing SAGD satellite, it is particularly advantageous to switch to SAGDOX, because:
• the SAGDOX increments can be quite large - up to 1 1 1 KBD increment based on an existing 10 KBD SAGD satellite.
• Figures 8, 9, 10, 1 1, & 12 and Tables 8 & 9 show an analysis of a SAGDOX expansion to a 10 KBD SAGD satellite, assuming the existing steam capacity at the satellite is used to supply the steam for SAGDOX, and the size of the expansion is adjusted to consume all the steam for a range of steam and oxygen mixes from 5 to 50% (v/v) oxygen. On an incremental basis, no additional capacity for steam generation and water treatment or new pipeline capacity for treated water supple and fuel gas is needed. This simplifies capital expenditures and the pipeline corridor expansion.
• Table 10 summarizes the capex item differences at the satellite site and central site when comparing SAGD with SAGDOX, as well as some of the advantages of the present invention.
• Oxygen 480 BTU/SCF (Butler (1991))
• SAGDOX gas treating - may not need, may not be substantial

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Physics & Mathematics (AREA)
• Environmental & Geological Engineering (AREA)
• Fluid Mechanics (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Priority Applications (2)

Applications Claiming Priority (10)

Publications (1)

Family

ID=50431829

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (6)

Citations (2)

Family Cites Families (3)

• 2013
  • 2013-05-07 WO PCT/CA2013/000452 patent/WO2013166586A1/fr not_active Ceased
  • 2013-05-07 BR BR112014027854A patent/BR112014027854A2/pt not_active IP Right Cessation
  • 2013-05-08 BR BR112014027857A patent/BR112014027857A2/pt not_active IP Right Cessation
  • 2013-12-12 US US14/104,711 patent/US20140096962A1/en not_active Abandoned
• 2016
  • 2016-05-18 US US15/157,948 patent/US20160265327A1/en not_active Abandoned

Patent Citations (2)

Also Published As

Similar Documents

Legal Events