WO2007117787A2 - Récupération assistée d'hydrocarbures par le chauffage par convection de formations de sables bitumineux - Google Patents

Récupération assistée d'hydrocarbures par le chauffage par convection de formations de sables bitumineux Download PDF

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Publication number
WO2007117787A2
WO2007117787A2 PCT/US2007/063185 US2007063185W WO2007117787A2 WO 2007117787 A2 WO2007117787 A2 WO 2007117787A2 US 2007063185 W US2007063185 W US 2007063185W WO 2007117787 A2 WO2007117787 A2 WO 2007117787A2
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Prior art keywords
well
diluent
formation
hydrocarbons
fracture
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PCT/US2007/063185
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English (en)
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WO2007117787A3 (fr
Inventor
Grant Hocking
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Geosierra Llc
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Priority claimed from US11/277,775 external-priority patent/US20070199710A1/en
Application filed by Geosierra Llc filed Critical Geosierra Llc
Priority to CA002648014A priority Critical patent/CA2648014A1/fr
Publication of WO2007117787A2 publication Critical patent/WO2007117787A2/fr
Publication of WO2007117787A3 publication Critical patent/WO2007117787A3/fr

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    • 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
    • E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
    • 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
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation

Definitions

  • the present invention generally relates to enhanced recovery of petroleum fluids from the subsurface by convective heating of the oil sand formation and the viscous heavy oil and bitumen in situ, more particularly to a method and apparatus to extract a particular fraction of the in situ hydrocarbon reserve by controlling the reservoir temperature and pressure, while also minimizing water inflow into the heated zone and well bore, resulting in increased production of petroleum fluids from the subsurface formation.
  • Heavy oil and bitumen oil sands are abundant in reservoirs in many parts of the world such as those in Alberta, Canada, Utah and California in the United States, the Orinoco Belt of Venezuela, Indonesia, China and Russia.
  • the hydrocarbon reserves of the oil sand deposit is extremely large in the trillions of barrels, with recoverable reserves estimated by current technology in the 300 billion barrels for Alberta, Canada and a similar recoverable reserve for Venezuela.
  • These vast heavy oil (defined as the liquid petroleum resource of less than 20° API gravity) deposits are found largely in unconsolidated sandstones, being high porosity permeable cohesionless sands with minimal grain to grain cementation.
  • the hydrocarbons are extracted from the oils sands either by mining or in situ methods.
  • the heavy oil and bitumen in the oil sand deposits have high viscosity at reservoir temperatures and pressures. While some distinctions have arisen between tar and oil sands, bitumen and heavy oil, these terms will be used interchangeably herein.
  • the oil sand deposits in Alberta, Canada extend over many square miles and vary in thickness up to hundreds of feet thick. Although some of these deposits lie close to the surface and are suitable for surface mining, the majority of the deposits are at depth ranging from a shallow depth of 150 feet down to several thousands of feet below ground surface. The oil sands located at these depths constitute some of the world's largest presently known petroleum deposits.
  • bitumen a viscous hydrocarbon material, commonly referred to as bitumen, in an amount that ranges up to 15% by weight.
  • Bitumen is effectively immobile at typical reservoir temperatures. For example at 15° C, bitumen has a viscosity of -1,000,000 centipoise. However, at elevated temperatures the bitumen viscosity changes considerably to -350 centipoise at 100° C down to -10 centipoise at 180° C.
  • the oil sand deposits have an inherently high permeability ranging from -1 to 10 Darcy, thus upon heating, the heavy oil becomes mobile and can easily drain from the deposit.
  • Solvents applied to the bitumen soften the bitumen and reduce its viscosity and provide a non-thermal mechanism to improve the bitumen mobility.
  • Hydrocarbon solvents consist of vaporized light hydrocarbons such as ethane, propane, or butane or liquid solvents such as pipeline diluents, natural condensate streams, or fractions of synthetic crudes.
  • the diluent can be added to steam and flashed to a vapor state or be maintained as a liquid at elevated temperature and pressure, depending on the particular diluent composition. While in contact with the bitumen, the saturated solvent vapor dissolves into the bitumen. This diffusion process is due to the partial pressure difference between the saturated solvent vapor and the bitumen.
  • the oil in the bitumen becomes diluted and mobile and will flow under gravity.
  • the resultant mobile oil may be deasphalted by the condensed solvent, leaving the heavy asphaltenes behind within the oil sand pore space with little loss of inherent fluid mobility in the oil sands due to the small weight percent (5-15%) of the asphaltene fraction to the original oil in place.
  • Deasphalting the oil from the oil sands produces a high grade quality product by 3°-5° API gravity. If the reservoir temperature is elevated the diffusion rate of the solvent into the bitumen is raised considerably being two orders of magnitude greater at 100° C compared to ambient reservoir temperatures of -15° C.
  • the CSS process raises the steam injection pressure above the formation fracturing pressure to create fractures within the formation and enhance the surface area access of the steam to the bitumen. Successive steam injection cycles reenter earlier created fractures and thus the process becomes less efficient over time. CSS is generally practiced in vertical wells, but systems are operational in horizontal wells, but have complications due to localized fracturing and steam entry and the lack of steam flow control along the long length of the horizontal well bore.
  • a thermal steam extraction process referred to a HASDrive heat and hydrogenate the heavy oils in situ in the presence of a metal catalyst
  • HASDrive heat and hydrogenate the heavy oils in situ in the presence of a metal catalyst
  • U.S. Patent No. 3,994,340 to Anderson et al U.S. Patent No. 4,696,345 to Hsueh
  • U.S. Patent No. 4,706,751 to Gondouin U.S. Patent No. 5,054,551 to Duerksen
  • U.S. Patent No. 5,145,003 to Duerksen It is disclosed that at elevated temperature and pressure the injection of hydrogen or a combination of hydrogen and carbon monoxide to the heavy oil in situ in the presence of a metal catalyst will hydrogenate and thermal crack at least a portion of the petroleum in the formation.
  • Solvent assisted recovery of hydrocarbons in continuous and cyclic modes are described including the VAPEX process and combinations of steam and solvent plus heat, see U.S. Patent No. 4,450,913 to Allen et al, U.S. Patent No. 4,513,819 to Islip et al, U.S. Patent No. 5,407,009 to Butler et al, U.S. Patent No. 5,607,016 to Butler, U.S. Patent No. 5,899,274 to Oberfeld et al, U.S. Patent No. 6,318,464 to Mokrys, U.S. Patent No. 6,769,486 to Lim et al, and U.S. Patent No.
  • the VAPEX process generally consists of two horizontal wells in a similar configuration to SAGD; however, there are variations to this including spaced horizontal wells and a combination of horizontal and vertical wells.
  • the startup phase for the VAPEX process can be lengthy and take many months to develop a controlled connection between the two wells and avoid premature short circuiting between the injector and producer.
  • the VAPEX process with horizontal wells has similar issues to CSS and SAGD in horizontal wells, due to the lack of solvent flow control along the long horizontal well bore, which can lead to non-uniformity of the vapor chamber development and growth along the horizontal well bore.
  • Hydraulic fracturing of petroleum recovery wells enhances the extraction of fluids from low permeable formations due to the high permeability of the induced fracture and the size and extent of the fracture.
  • a single hydraulic fracture from a well bore results in increased yield of extracted fluids from the formation.
  • Hydraulic fracturing of highly permeable unconsolidated formations has enabled higher yield of extracted fluids from the formation and also reduced the inflow of formation sediments into the well bore.
  • the well casing is cemented into the borehole, and the casing perforated with shots of generally 0.5 inches in diameter over the depth interval to be fractured.
  • the formation is hydraulically fractured by injecting fracture fluid into the casing, through the perforations and into the formation.
  • the hydraulic connectivity of the hydraulic fracture or fractures formed in the formation may be poorly connected to the well bore due to restrictions and damage due to the perforations.
  • Creating a hydraulic fracture in the formation that is well connected hydraulically to the well bore will increase the yield from the well, result in less inflow of formation sediments into the well bore and result in greater recovery of the petroleum reserves from the formation.
  • one of the horizontal stresses is generally at a minimum, resulting in a vertical fracture formed by the hydraulic fracturing process. It is also well known in the art that the azimuth of the vertical fracture is controlled by the orientation of the minimum horizontal stress in consolidated sediments and brittle rocks.
  • Hydraulic fracturing generally consists of two types, propped and unpropped fracturing. Unpropped fracturing consists of acid fracturing in carbonate formations and water or low viscosity water slick fracturing for enhanced gas production in tight formations. Propped fracturing of low permeable rock formations enhances the formation permeability for ease of extracting petroleum hydrocarbons from the formation.
  • Propped fracturing of high permeable formations is for sand control, i.e. to reduce the inflow of sand into the well bore, by placing a highly permeable propped fracture in the formation and pumping from the fracture thus reducing the pressure gradients and fluid velocities due to draw down of fluids from the well bore.
  • Hydraulic fracturing involves the literally breaking or fracturing the rock by injecting a specialized fluid into the well bore passing through perforations in the casing to the geological formation at pressures sufficient to initiate and/or extend the fracture in the formation.
  • the theory of hydraulic fracturing utilizes linear elasticity and brittle failure theories to explain and quantify the hydraulic fracturing process.
  • Hydraulic fracturing has evolved into a highly complex process with specialized fluids, equipment and monitoring systems.
  • the fluids used in hydraulic fracturing vary depending on the application and can be water, oil, or multi-phased based gels.
  • Aqueous based fracturing fluids consist of a polymeric gelling agent such as solvatable (or hydratable) polysaccharide, e.g. galactomannan gums, glycomannan gums, and cellulose derivatives.
  • the purpose of the hydratable polysaccharides is to thicken the aqueous solution and thus act as viscosifiers, i.e. increase the viscosity by 100 times or more over the base aqueous solution.
  • a cross-linking agent can be added which further increases the viscosity of the solution.
  • the borate ion has been used extensively as a cross-linking agent for hydrated guar gums and other galactomannans, see U.S. Patent No. 3,059,909 to Wise.
  • Other suitable cross-linking agents are chromium, iron, aluminum, and zirconium (see U.S. Patent No. 3,301,723 to Chrisp) and titanium (see U.S. Patent No. 3,888,312 to Tiner et al).
  • a breaker is added to the solution to controllably degrade the viscous fracturing fluid. Common breakers are enzymes and catalyzed oxidizer breaker systems, with weak organic acids sometimes used.
  • Oil based fracturing fluids are generally based on a gel formed as a reaction product of aluminum phosphate ester and a base, typically sodium aluminate.
  • the reaction of the ester and base creates a solution that yields high viscosity in diesels or moderate to high API gravity hydrocarbons.
  • Gelled hydrocarbons are advantageous in water sensitive oil producing formations to avoid formation damage, that would otherwise be caused by water based fracturing fluids.
  • a vertical hydraulic fracture can be propagated at a pre-determined azimuth in unconsolidated or weakly cemented sediments and that multiple orientated vertical hydraulic fractures at differing azimuths from a single well bore can be initiated and propagated for the enhancement of petroleum fluid production from the formation. It is now known that unconsolidated or weakly cemented sediments behave substantially different from brittle rocks from which most of the hydraulic fracturing experience is founded.
  • the present invention is a method and apparatus for enhanced recovery of petroleum fluids from the subsurface by convective heating of the oil sand formation and the heavy oil and bitumen in situ, by either a downhole heater in the well bore or heat supplied to the well bore by a heat transferring fluid from a surface fired heater or surface burner.
  • Multiple propped hydraulic fractures are constructed from the well bore into the oil sand formation and filled with a highly permeable proppant.
  • the permeable propped fractures and well bore are filled with a diluent and elevated temperatures from the heater set up thermal convective cells in the diluent forcing heated diluent to flow upward and outward in the propped fractures and circulating back down and back towards the well bore heating the oil sands and in situ bitumen on the vertical faces of the propped fractures.
  • the diluent now mixed with produced products from the oil sand re-enters the bottom of the well bore and passes over the heater element and is reheated to continue to flow in the convective cell.
  • the heating and diluting of the in place bitumen is predominantly circumferential, i.e.
  • a non condensing gas can be injected to remain in the uppermost portions of the propped fractures.
  • the diluent would preferably be an on site diluent, light oil, or natural gas condensate stream, or a mixture thereof, with its selected composition to provide a primarily liquid phase of the diluent in the process zone at the imposed reservoir temperatures and pressures.
  • the diluent could be derived from synthetic crude if available.
  • the prime use of the diluent is to transfer by convection, heat from the well bore to the process zone, heat and dilute the produced product to yield a mixture that will flow readily at the elevated temperatures through the oil sands and propped fractures back to the well bore.
  • the selected range of temperatures and pressures to operate the process will depend on reservoir depth, ambient conditions, quality of the in place heavy oil and bitumen, composition of the diluent, and the presence of nearby water bodies.
  • the process can be operated at a low temperature range of -100° C for a heavy oil rich oil sand deposit and at a moderate temperature range of ⁇ 150°-180° C for a bitumen rich oil sand deposit, basically to reduce the bitumen viscosity and thus mobilized the in place oil.
  • the process can be operated a much higher temperatures >270° C to pyrolysis the in place hydrocarbon in the presence of hydrogen and/or catalysts.
  • the operating pressure of the process may be selected to closely match the ambient reservoir conditions to minimize water inflow into the process zone and the well bore. However, the process operating conditions may deviate from this pressure in order to maintain the diluent and produced mixture in a predominantly liquid state, i.e. the diluent is to remain in most part soluble in the produced heavy oil or bitumen at the operating process temperatures and pressures.
  • forced convection by a pump can assist and transfer additional heat into the propped fracture convective cells, by pumping the diluent and produced product at greater velocities past the heater and into the propped fractures and mobile zone within the oil sands.
  • the gas in the process zone could be produced by sweeping the process zone with another gas, or the gas could be re-pressurized to reservoir conditions to minimize water inflow into the process zone and the thermal energy in the process zone oil sands allowed to conduct radially into the surrounding cooler oil sands and thus mobilize additional hydrocarbons (i.e. a heat conductive soak) albeit at a much reduced rate than during the active heating phase of the process.
  • additional hydrocarbons i.e. a heat conductive soak
  • the remaining liquid hydrocarbons and gas are produced from the oil sand formation after some extended heat conductive soak period.
  • the prime benefits of the above process are to provide an efficient low temperature heating phase to mobilize the hydrocarbon in situ, to produce a higher grade petroleum product, and to maintain ambient reservoir pressure conditions and thus limit water inflow into the process zone.
  • the disadvantage of the process is that only minimal quantities of hydrocarbons are extracted from the subsurface during the active heating phase of the process since the majority of the hydrocarbons are produced near the end of the process.
  • the present invention contemplates the formation of fractures which generally extend laterally away from a vertical or near vertical well penetrating an earth formation and in a generally vertical plane, those skilled in the art will recognize that the invention may be carried out in earth formations wherein the fractures and the well bores can extend in directions other than vertical.
  • the present invention provides a method and apparatus for enhanced recovery of petroleum fluids from the subsurface by convective heating of the oil sand formation and the viscous heavy oil and bitumen in situ, more particularly to a method and apparatus to extract a particular fraction of the in situ hydrocarbon reserve by controlling the reservoir temperature and pressure, while also minimizing water inflow into the heated zone and well bore resulting in increased production of petroleum fluids from the subsurface formation.
  • FIG. 1 is a horizontal cross-section view of a well casing having dual fracture winged initiation sections prior to initiation of multiple azimuth controlled vertical fractures.
  • FIG. 2 is a cross-sectional side elevation view of a well casing having dual fracture winged initiation sections prior to initiation of multiple azimuth controlled vertical fractures.
  • FIG. 3 is an isometric view of a well casing having dual propped fractures with downhole heater and convection fluid flow shown in the subsurface.
  • FIG. 4 is a horizontal cross-sectional side elevation view of a well casing and propped fracture with downhole heater and convective fluid flow shown in the subsurface.
  • FIG. 5 is a horizontal cross-section view of a well casing having multiple fracture dual winged initiation sections after initiation of all four controlled vertical fractures.
  • FIG. 6 is an isometric view of a well casing having four propped fractures with downhole heater and convection fluid flow shown in the subsurface.
  • FIG. 7 is an isometric view of a well casing having dual multi-stage propped fractures with downhole heater and convection fluid flow shown in the subsurface.
  • the present invention involves a method and apparatus for enhanced recovery of petroleum fluids from the subsurface by convective heating of the oil sand formation and the heavy oil and bitumen in situ, by either a downhole heater in the well bore or heat supplied to the well bore by a heat transferring fluid from a surface fired heater or surface burner.
  • Multiple propped hydraulic fractures are constructed from the well bore into the oil sand formation and filled with a highly permeable proppant.
  • the permeable propped fractures and well bore are filled with a diluent, the heater and pump activated with forced thermal convective flow forcing the heated diluent to flow upward and outward in the propped fractures and circulating back down and back towards the well bore heating the oil sands and in situ bitumen on the vertical faces of the propped fractures.
  • the diluent now mixed with produced products from the oil sand re-enters the bottom of the well bore and passes over the heater element and is reheated to continue to flow in the convective cell.
  • the heating and diluting of the in place bitumen is predominantly circumferentially, i.e. orthogonal to the propped fracture, diffusion from the propped vertical fracture faces progressing at a nearly uniform rate into the oil sand deposit.
  • the heated low viscosity oil is produced through the well bore at the completion of the active heating phase of the process.
  • FIGS. 1, 2, and 3 illustrate the initial setup of the method and apparatus for forming an in situ forced convective heating system of the oil sand deposit and for the extraction of the processed hydrocarbons.
  • Conventional bore hole 5 is completed by wash rotary or cable tool methods into the formation 8 to a predetermined depth 7 below the ground surface 6.
  • Injection casing 1 is installed to the predetermined depth 7, and the installation is completed by placement of a grout 4 which completely fills the annular space between the outside the injection casing 1 and the bore hole 5.
  • Injection casing 1 consists of four initiation sections 21, 22, 23, and 24 to produce two fractures one orientated along plane 2, 2' and one orientated along plane 3, 3'.
  • Injection casing 1 must be constructed from a material that can withstand the pressures that the fracture fluid exerts upon the interior of the injection casing 1 during the pressurization of the fracture fluid.
  • the grout 4 can be any conventional material used in steam injection casing cementation systems that preserves the spacing between the exterior of the injection casing 1 and the bore hole 5 throughout the fracturing procedure, preferably a non-shrink or low shrink cement based grout that can withstand high temperature and differential strains.
  • the outer surface of the injection casing 1 should be roughened or manufactured such that the grout 4 bonds to the injection casing 1 with a minimum strength equal to the down hole pressure required to initiate the controlled vertical fracture. The bond strength of the grout 4 to the outside surface of the casing 1 prevents the pressurized fracture fluid from short circuiting along the casing-to-grout interface up to the ground surface 6.
  • the injection casing 1 comprises two fracture dual winged initiation sections 21, 22, 23, and 24 installed at a predetermined depth 7 within the bore hole 5.
  • the winged initiation sections 21, 22, 23, and 24 can be constructed from the same material as the injection casing 1. The position below ground surface of the winged initiation sections 21, 22, 23, and 24 will depend on the required in situ geometry of the induced hydraulic fracture and the reservoir formation properties and recoverable reserves.
  • the hydraulic fractures will be initiated and propagated by an oil based fracturing fluid consisting of a gel formed as a reaction product of aluminum phosphate ester and a base, typically sodium aluminate.
  • the reaction of the ester and base creates a solution that yields high viscosity in diesels or moderate to high API gravity hydrocarbons.
  • Gelled hydrocarbons are advantageous in water sensitive oil producing formations to avoid formation damage, that would otherwise be caused by water based fracturing fluids.
  • the oil based gel provides the added advantage of placing the required diluent within the propped fracture, without the inherent problems of injecting a diluent into a water saturated proppant fracture if water based fracturing fluids were used.
  • the pumping rate of the fracturing fluid and the viscosity of the fracturing fluids needs to be controlled to initiate and propagate the fracture in a controlled manner in weakly cemented sediments such as oil sands.
  • the dilation of the casing and grout imposes a dilation of the formation that generates an unloading zone in the oil sand, and such dilation of the formation reduces the pore pressure in the formation in front of the fracturing tip.
  • the variables of interest are v the velocity of the fracturing fluid in the throat of the fracture, i.e.
  • the fracture propagation rate w the width of the fracture at its throat, being the casing dilation at fracture initiation, and ⁇ the viscosity of the fracturing fluid at the shear rate in the fracture throat.
  • the fracturing fluid pumping rate needs to be limited so that the Re is less than 100 during fracture initiation and less than 250 during fracture propagation. Also if the fracturing fluid can flow into the dilated zone in the formation ahead of the fracture and negate the induce pore pressure from formation dilation, then the fracture will not propagate along the intended azimuth.
  • the fracture fluid forms a highly permeable hydraulic fracture by placing a proppant in the fracture to create a highly permeable fracture.
  • proppants are typically clean sand for large massive hydraulic fracture installations or specialized manufactured particles (generally resin coated sand or ceramic in composition), which are designed also to limit flow back of the proppant from the fracture into the well bore.
  • the fracture fluid-gel- proppant mixture is injected into the formation and carries the proppant to the extremes of the fracture.
  • the predetermined fracture thickness may need to be increased by utilizing the process of tip screen out or by re-fracturing the already induced fractures.
  • the tip screen out process involves modifying the proppant loading and/or fracture fluid properties to achieve a proppant bridge at the fracture tip.
  • the fracture fluid is further injected after tip screen out, but rather then extending the fracture laterally or vertically, the injected fluid widens, i.e. thickens, and fills the fracture from the fracture tip back to the well bore.
  • the casing 1 is washed clean of fracturing fluids and screens 25 and 26 are present in the casing as a bottom screen 25 and a top screen 26 for hydraulic connection from the casing well bore 1 to the propped fractures 30.
  • a downhole electric heater 17 is placed inside the casing, with a downhole pump 18, connected to a power and instrumentation cable 27, with downhole packers 16 to isolate the top screen interval from the remaining sections of the well bore, piping 27, and downhole valve 19.
  • the heater 17 and pump 18 are energized through electric power provided from the surface through cable 27.
  • the downhole valve 19 in the closed position enables the pumped hot fluid to flow through the top screen 26 into the fracture and oil sand formation as flow vectors 10, 11, and 12 illustrating the convection cell formation due to the pumped hot fluid.
  • the surface controlled downhole valve 19 in the open position enables the pump fluid to flow only up the tubing 9 and not into the top screen 26.
  • the fluid diluent is cooled by the oil sands 8 adjacent to the propped fractures 30 as it flows from 10 to 11 to 12, and enters the well bore through the bottom screen 25 to be convectively moved 13 up past the heater 17 for a return to the forced convective re-circulation cell.
  • the hot diluent flows in a re-circulation force convective cell as shown by vectors 10, 11, and 12 in the propped fracture 30 with proppant shown 34 and mobilized oil sand zone 35 adjacent to the propped fractures 34.
  • the mobilized oil sand zone extends into the bitumen oil sands 36 by diffusive processes 33 due to partial pressure and temperature gradients.
  • the mixture of diluent and produced bitumen results in a modified hydrocarbon that flows from the bitumen 36 into the mobilized oil sand zone 35 and the propped fracture 34 to flow eventually as 12 into the lower screen 25 of the well bore.
  • the process zone includes the propped hydraulic fractures 30, the mobile zone 35 in the oil sands of the formation, and the fluid contained therein.
  • the well bore casing 1 may be considered part of the process zone when a part of the process for recovering hydrocarbons from the formation is carried out in the well casing.
  • the mobilized oil sand zone 35 grows circumferentially 33, i.e. orthogonal to the propped fractures 30, and becomes larger with time until eventually the bitumen within the lateral 31 and vertical 32 extent of the propped fracture system is completely mobilized by the elevated temperature and diffused diluent.
  • the mobilized oil sand region 35 grows the diluent fluid 12 entering the lower screen 26 of the well bore becomes a mixture of mobilized oil from the bitumen and the original diluent. It may be necessary to dilute this mixture from time to time with additional diluent to yield the required viscosity and heat transfer properties of the heated fluid in the re-circulation cell.
  • the valve 19 Upon growth of the mobilized oil sand zone to the lateral 31 and vertical 32 extents of the propped fractures 30, the valve 19 will be open and the liquid hydrocarbons produced up the tubing 9 to the surface.
  • the process zone can be injected with a vaporized hydrocarbon solvent, such as ethane, propane, or butane and mixed with a diluent gas, such as methane, nitrogen, and carbon dioxide.
  • a vaporized hydrocarbon solvent such as ethane, propane, or butane
  • a diluent gas such as methane, nitrogen, and carbon dioxide.
  • the solvent will contact the in situ bitumen at the edge of the process zone, diffusive into and soften the bitumen, so that it flows by gravity to the well bore. Dissolved solvent and product hydrocarbon are produced and further solvent and diluent gas injected into the process zone.
  • the elevated temperature of the process zone will significantly accelerate the diffusion process of the solvent diffusing into the bitumen compared to ambient reservoir conditions.
  • the solvent and diluent gas will be injected at near reservoir pressures to minimize water inflow into the process zone.
  • the solvent vapor in the injection gas is maintained saturated at or near its dew point at the process operating temperatures and pressures.
  • the reservoir temperatures and pressures and composition of the produced fluid will be controlled to optimize the process as regards the quality and composition of the produced product, the heat transfer, and diluent properties of the produced mixture, and to minimize water inflow into the process zone and well bore.
  • FIGS. 5 and 6 Another embodiment of the present invention is shown on FIGS. 5 and 6, consisting of an injection casing 38 inserted in a bore hole 39 and grouted in place by a grout 40.
  • the injection casing 38 consists of eight symmetrical fracture initiation sections 41, 42, 43, 44, 45, 46, 47, and 48 to install a total of four hydraulic fractures on the different azimuth planes 31, 31', 32, 32', 33, 33', 34, and 34'.
  • the process results in four hydraulic fractures installed from a single well bore at different azimuths as shown on FIG. 6.
  • the casing 1 is washed clean of fracturing fluids and screens 25 and 26 are present in the casing as a bottom screen 25 and a top screen 26 for hydraulic connection of the well bore 10 to the propped fractures 30.
  • a downhole electric heater 17 is placed inside the casing, with a downhole pump 18, connected to a power and instrumentation cable 27, with downhole packers 16 to isolate the top screen interval from the remaining sections of the well bore, piping 27, and downhole valve 19.
  • the heater 17 and pump 18 are energized through electric power provided from the surface through cable 27.
  • the pump and thermal buoyancy effects force the diluent fluid to flow 13 past the heater into 14 the pump 18 and up 15 the tubing 27 and out of the top screen 26.
  • the downhole valve 19 in the closed position enables the pumped hot fluid to flow through the top screen 26 into the fracture and oil sand formation as flow vectors 10, 11, and 12 illustrating the convection cell formation due to the pumped hot fluid.
  • the fluid diluent is cooled by the oil sands 8 adjacent to the propped fractures 30 as it flows from 10 to 1 1 to 12, and enters the well bore through the bottom screen 25 to be convectively moved 13 up past the heater 17 for a return to the forced convective re-circulation cell.
  • the mobilized hydrocarbons are produced from the well bore and heated zone through opening the downhole valve 19 and transported by tubing 9 to the surface.
  • FIG. 7 Another embodiment of the present invention is shown on FIG. 7, similar to FIG. 3 except that the hydraulic fractures are constructed by a multi-stage process with various proppant materials of differing permeability.
  • Multi-stage fracturing involves first injecting a proppant material 50 to form a hydraulic fracture 30. Prior to creation of the full fracture extent, a different proppant material 51 is injected into the fracture over a reduced central section of the well bore 53 to create an area of the hydraulic fracture loaded with the different proppant material 51.
  • the multi-stage fracturing could consist of a third stage by injecting a third different proppant material 52.
  • the circulation of the diluent and mobilized oil in the formed fracture can be extended laterally a greater distance compared to a hydraulic fracture filled with a uniform permeable proppant, as shown earlier in FIG. 3.
  • the proppant materials are selected so that the proppant material 50 has the highest proppant permeability, with proppant material 51 being lower, and with proppant material 52 having the lowest proppant permeability.
  • the different permeability of the proppant materials thus optimizes the lateral extent of the fluids flowing within the hydraulic fractures and controls the geometry and propagation rate of the convective heat to the oil sand formation.
  • the permeability of the proppant materials will typically range from 1 to 100 Darcy for the proppant material 50 in the fracture zone, i.e. generally being at least 10 times greater than the oil sand formation permeability.
  • the proppant material 51 in fracture zone is selected to be lower than the proppant material 50 in the fracture zone by at least a factor of 2, and proppant material 52 in the fracture zone close to the well bore casing 1 is selected to be in the milli-Darcy range thus limiting fluid flow in the fracture zone containing the proppant material 52.

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  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

La présente invention a trait à un procédé et à un appareil permettant la récupération assistée de fluides pétroliers à partir de la subsurface, par le chauffage par convection d'une formation de sables bitumineux, de pétrole lourd et de bitume in situ à l'aide d'un dispositif de chauffage électrique de fond de puits. Le procédé selon l'invention consiste à construire de multiples fractures hydrauliques verticales étançonnées depuis le puits de forage jusque dans la formation de sables bitumineux, et à les remplir avec un diluant. Le dispositif de chauffage et la pompe de fond forcent le flux convectif thermique du diluant chauffé à s'écouler vers le haut et l'extérieur jusque dans les fractures étançonnées, puis à redescendre et à retourner vers le puits de forage chauffant les sables bitumineux et le bitume in situ sur les faces verticales des fractures. Le diluant désormais mélangé à des produits provenant des sables bitumineux entre à nouveau dans le fond du puits de forage, passe par-dessus l'élément de chauffage et est chauffé de nouveau pour qu'il continue à s'écouler dans la cellule convective. Ainsi, le chauffage et la dilution du bitume sur place se produisent de manière principalement périphérique, c'est-à-dire orthogonalement à la fracture étançonnée, la diffusion à partir des faces de la fracture verticale étançonnée progressant à une vitesse pratiquement uniforme dans le gisement de sables bitumineux. L'hydrogénation et le craquage thermique in situ du bitume sur place permet d'obtenir un produit de qualité supérieure. Le pétrole à faible viscosité chauffé est produit par le biais du puits de forage à la fin de la phase active de chauffage du processus.
PCT/US2007/063185 2006-03-29 2007-03-02 Récupération assistée d'hydrocarbures par le chauffage par convection de formations de sables bitumineux WO2007117787A2 (fr)

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US11/277,775 2006-03-29
US11/277,775 US20070199710A1 (en) 2006-02-27 2006-03-29 Enhanced hydrocarbon recovery by convective heating of oil sand formations
US11/379,829 2006-04-24
US11/379,829 US20070199706A1 (en) 2006-02-27 2006-04-24 Enhanced hydrocarbon recovery by convective heating of oil sand formations

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