CN106593397A - Heavy oil reservoir exploitation method - Google Patents
Heavy oil reservoir exploitation method Download PDFInfo
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- CN106593397A CN106593397A CN201510663318.2A CN201510663318A CN106593397A CN 106593397 A CN106593397 A CN 106593397A CN 201510663318 A CN201510663318 A CN 201510663318A CN 106593397 A CN106593397 A CN 106593397A
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Classifications
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- 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
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- 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
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- 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
- E21B43/243—Combustion in situ
Abstract
The invention provides a heavy oil reservoir exploitation method. The heavy oil reservoir exploitation method comprises that a vertical well-horizontal well row-column type well net is arranged in the mine section of a heavy oil reservoir the vertical well-horizontal well row-column type well net comprises vertical well rows and horizontal wells which are distributed alternatively, the well spacing a between adjacent vertical wells in each vertical well row is equal, the well spacing b between each vertical well and the adjacent horizontal well is equal, the well spacing c between adjacent vertical wells at two sides of one horizontal well and in adjacent vertical well rows satisfies the formula c= the square root of (a<2>/4+4b<2>), steam is injected into all vertical wells and horizontal wells, steam huff and puff production is carried out until the stratum temperature reaches the temperature corresponding to the inflection point of a crude oil viscosity-temperature curve, the steam injection intensity of the vertical wells ranges from 100 t/m to 120 t/m, the steam injection intensity of the horizontal wells ranges from 15 t/m to 20t/m, after the steam huff and puff production, the vertical well arranged in the central position is selected as a steam injection well, after the oil layer is ignited, air is injected into the steam injection well, and linear fire flooding production is carried out. According to the invention, problems that in the heavy oil reservoir, the connectivity of injection and production wells is poor, and the recovery ratio is low are solved.
Description
Technical field
The present invention relates to field of petroleum exploitation, in particular to a kind of recovery method of heavy crude reservoir.
Background technology
So far, SAGD (SAGD), steam soak (CSS) and steam drive (SF) to become exploitation thick
The main method of oil.Steam assisted gravity drainage techniques are applied to continuous core intersection more than 15 meters, every the obsolete oil reservoir of interlayer,
In theory ultimate recovery is up to 55%～60%.The field test carried out by windy city oil field shows, due to viscosity of crude it is higher, well
Between filtrational resistance it is larger, the loop preheat phase persistent period is long, and steam consumption is big；Production phase, vertical upper draining speed was slower,
Liquid output and oil production are relatively low, and oil and gas are relatively low.Cyclic steam injection tech is that a kind of oil reservoir is applied widely, easy to operate, more ripe
One technology.But for heavy crude reservoir, there are the following problems：Steam injection pressure is higher, and channeling is serious between well, interlayer and plane
It is particularly thorny；Ground and wellbore heat loss are larger, and water recovery rate, the thermal efficiency are relatively low, and oil reservoir heating small volume, recovery ratio is general
All over relatively low.Steam flooding technology is more as the secondary oil recovery technology after a kind of steam soak.Can steam drives obtain preferably production effect
Really, it is not only relevant with reservoir condition, also affected by operating condition, to steam drive before reservoir pressure, production-injection ratio, steam injection rate,
Steam injection mass dryness fraction has certain requirement.
To solve the problems, such as that heavy crude reservoir steam injection heated perimeter is limited, yielding poorly, Chinese Patent Application No. is 201010193396.8
Disclose a kind of carries out turning steam flooding exploitation method after steam soak by way of various well type are combined.The method achieve to whole
Individual limit of mining carries out three-dimensional heating comprehensively, steam affected area as big as possible is formed under the cooperation of center steam injection well, to carry
The mobility of high viscous oil simultaneously improves oil and water mobility ratio, solves that stratiform viscosity of thickened oil is high, is difficult to drive, and steam drives sweeps that scope is little to ask
Topic.But the steam in this method later stage is driven and reservoir condition is required higher, it is not suitable for that core intersection is relatively thin, anisotropism is strong
Sandstone oil reservoir or sandy conglomerate bodies, are affected in addition by operating condition, and this method performance oil-yielding stratum efficiency of heating surface is low, individual well is produced
Oil mass is low, the problem that recovery ratio is low.
The content of the invention
Present invention is primarily targeted at a kind of recovery method of heavy crude reservoir is provided, to solve heavy crude reservoir because viscosity of crude height is made
Into injection-production well between the low problem of poor connectivity, recovery ratio.
To achieve these goals, the invention provides a kind of recovery method of heavy crude reservoir, the recovery method is comprised the following steps：
Straight well horizontal well determinant well pattern is set in the production zone of heavy crude reservoir, and straight well horizontal well determinant well pattern includes being alternately distributed
Straight well well row and horizontal well, well spacing a in each straight well well row between adjacent straight well is equal, each straight well and adjacent level well
Between well spacing b it is equal, the well spacing being located in adjacent straight well well row between the adjacent straight well of horizontal well both sides
Steam is injected in all straight wells and horizontal well, carries out steam soak and produce to formation temperature to reach that crude oil viscosity-temperature curve is corresponding to turn
Point temperature, wherein the steam injection intensity of straight well are 100～120t/m, and the steam injection intensity of horizontal well is 15～20t/m；Steam soak is produced
Afterwards, the straight well in centrally located straight well well row is selected as gas injection well, it is continuous in the rear well to steam injection for light oil reservoir
Injection air, carries out linear fireflood production.
Further, heavy crude reservoir meets following condition：Reservoir depth is less than 800 meters, and core intersection at 8～20 meters, satisfy by oil-containing
It is more than 65% with degree, porosity is more than 22%, and permeability is more than 300mD, and 50 DEG C of degassed crude viscosity are less than 20000mPas.
Further, heavy crude reservoir is monolayer sandstone or sandy conglomerate bodies.
Further, a is 50～100 meters,The horizontal section length of horizontal well is 3a.
Further, when heavy crude reservoir is less than 700mPas in 50 DEG C of degassed crude viscosity, a is 100 meters；Work as heavy crude reservoir
In 50 DEG C of degassed crude viscosity more than or equal to 700mPas and during less than 2000, a is 70 meters；When heavy crude reservoir is in 50 DEG C of degassings
More than or equal to 2000mPas and during less than 20000, a is 50～70 meters to viscosity of crude.
Further, the distance between horizontal well and oil reservoir bottom are 2～3 meters.
Further, the full well section of straight well is provided with perforation, and the bottom that the top of straight well has 8～10 perforation/rice, straight well has
There are 20 perforation/rice.
Further, horizontal well using the screen casing that 7 inches are hung under 9 inches of sleeve pipe tubular column structure.
Further, enter under in the screen casing of horizontal well a diameter of 4.5 inches oil pipe and a diameter of 1.25 inches of testing tube, and
Oil pipe and testing tube enter down to the toe-end of horizontal well, and 6～12 thermocouples are uniformly disposed wherein in testing tube.
Further, the production time of steam soak production is 4～5 years, and stage recovery percent of reserves reaches 15～20%；In steam soak
When production was carried out to 3.5～4.5 years, carry out continuous steam injection using all straight wells and horizontal well is discharged into by the way of the production of row liquid, production
0.5～1 year.
Further, in the step of linear fireflood is produced, burning crude oil threshold temperature is 400～450 DEG C.
Further, in the step of linear fireflood is produced, when a is 100 meters, the gas injection speed in each steam injection well is 1.5 × 104～2
×104m3/d；When a is 70 meters, the gas injection speed in each steam injection well is 1 × 104～1.5 × 104m3/d；It is 50～70 that a is a
Meter Shi, the gas injection speed in each steam injection well is 0.8 × 104～1.2 × 104m3/d。
Further, in the step of linear fireflood is produced, the horizontal well and straight well by the use of gas injection well both sides enters as producing well
Row continuous exhaust pneumatic wallop recovers the oil；Wherein, capacity of the horizontal well in the stable yields stage is 8000～10000m3/ d, lifting rate is 20～30t/d；
Capacity of the straight well in the stable yields stage is 4000～5000m3/ d, lifting rate is 10～15t/d；The capacity of horizontal well and straight well is maximum
It is worth for 8000～10000m3/d。
Further, in the step of linear fireflood is produced, to the content of gas component in producing well, the wellhead temperature of producing well and
The well head pressure of producing well is continuously monitored；When oxygen content, more than 5%, or judges the close producing well of combustion front in producing well
When, close producing well.
Using technical scheme, the present invention provides a kind of recovery method of heavy crude reservoir, and the method early stage adopts straight well water
Horizontal well determinant well pattern steam soak, carries out at short notice the heating of comprehensive solid to oil reservoir, reduces underground viscosity of thickened oil, changes
Kind crude oil fluidity；Later stage is produced using middle straight well well row gas injection, live wire to the linear fireflood that both sides extends, it is easy to formation compared with
The combustion front of stable and uniform propulsion, and the horizontal well positioned at oil reservoir middle and lower part can play adjustment live wire, raising vertical sweep efficiency
Effect, so as to improve oil output per well, so solve poor connectivity between the injection-production well that heavy crude reservoir is caused because of viscosity of crude height,
The low problem of recovery ratio.
Description of the drawings
The Figure of description for constituting the part of the application is used for providing a further understanding of the present invention, the schematic reality of the present invention
Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：
In the recovery method of the heavy crude reservoir that Fig. 1 is provided for embodiment of the present invention, straight well horizontal well determinant well pattern is adopted
Well location distribution schematic diagram；
In the recovery method of the heavy crude reservoir that Fig. 2 is provided for embodiment of the present invention, temperature between the well after steam soak production is carried out
Distribution schematic diagram；
In the recovery method of the heavy crude reservoir that Fig. 3 is provided for embodiment of the present invention, well location distribution when linear fireflood is produced is carried out
Schematic diagram；
In the recovery method of the heavy crude reservoir that Fig. 4 is provided for embodiment of the present invention, carry out being fired between injection-production well when linear fireflood is produced
Burn leading edge and heat front distribution schematic diagram.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.
Below with reference to the accompanying drawings and in conjunction with the embodiments describing the application in detail.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root according to this Shen
Illustrative embodiments please.As used herein, unless the context clearly indicates otherwise, otherwise singulative is also intended to
Including plural form, additionally, it should be understood that, when term "comprising" and/or " including " is used in this manual,
It indicates existing characteristics, step, operation, device, component and/or combinations thereof.
The invention provides a kind of recovery method of heavy crude reservoir.The recovery method is comprised the following steps：In the exploitation of heavy crude reservoir
Straight well horizontal well determinant well pattern is set in region, and straight well horizontal well determinant well pattern includes that alternatively distributed straight well well is arranged and level
Well, well spacing a in each straight well well row between adjacent straight well is equal, and well spacing b between each straight trap and adjacent level well is homogeneous
Deng the well spacing being located in adjacent straight well well row between the adjacent straight well of horizontal well both sidesTo all straight wells and water
Steam is injected in horizontal well, carries out steam soak and produce to formation temperature to reach the corresponding inflection temperature of crude oil viscosity-temperature curve, wherein directly
The steam injection intensity of well is 100～120t/m, and the steam injection intensity of horizontal well is 15～20t/m；After steam soak production, select and be located at
Straight well in the straight well well row in centre position is continuously injected into air as gas injection well in the rear well to steam injection for lighting oil reservoir, carries out
Linear fireflood production.
The recovery method of the heavy crude reservoir that the present invention is provided has advantages below：(1) straight well horizontal well determinant well pattern steam soak
The oil reservoir efficiency of heating surface is higher, heating volume is larger, and to turn fireflood production essential condition is provided；(2) relative to simple using straight
Well well pattern fireflood, is affected by action of gravity, and it is big, oily that the linear fireflood of horizontal well auxiliary straight well can solve filtrational resistance between injection-production well
Wall construction is difficult, the problem that oil production is low.
The illustrative embodiments of the recovery method of the heavy crude reservoir provided according to the present invention are provided.However,
These illustrative embodiments can be implemented by many different forms, and should not be construed to be limited solely to described herein
Embodiment.It should be appreciated that these embodiments are provided so that disclosure herein is thoroughly and complete, and
The design of these illustrative embodiments is fully conveyed to into those of ordinary skill in the art.
In the recovery method of the heavy crude reservoir that the present invention is provided, first, the condition of heavy crude reservoir is selected, it meets following condition：
Reservoir depth is less than 800 meters, and at 8～20 meters, oil saturation is more than 65% to core intersection, and porosity is more than 22%, permeability
More than 300mD, 50 DEG C of degassed crude viscosity are less than 20000mPas.Heavy crude reservoir can be monolayer sandstone or sandy conglomerate bodies,
Crude oil is common heavy oil, special thick oil or super-viscous oil, but viscosity is that 50 DEG C of degassed crude viscosity are less than 20000mPas.
Then, straight well horizontal well determinant well pattern, straight well horizontal well determinant well pattern bag are set in the production zone of heavy crude reservoir
Include alternatively distributed straight well well row and horizontal well, well spacing a in each straight well well row between adjacent straight well is equal, each straight trap with
Well spacing b between adjacent level well is equal, the well spacing being located in adjacent straight well well row between the adjacent straight well of horizontal well both sidesPreferably, a is 50～100 meters,The horizontal section length of horizontal well is 3a.
The well location distribution schematic diagram of adopted straight well horizontal well determinant well pattern is as shown in Figure 1.In Fig. 1,1 is steam soak production
Straight well；2 is the horizontal well of steam soak production.Wherein, well spacing, horizontal well and straight well well spacing and oil viscosity between straight well
Correlation, concrete corresponding relation is shown in Table 1.As shown in Table 1, when heavy crude reservoir is less than 700mPas in 50 DEG C of degassed crude viscosity,
A is 100 meters；When heavy crude reservoir in 50 DEG C of degassed crude viscosity more than or equal to 700mPas and during less than 2000, a is 70 meters；
When heavy crude reservoir in 50 DEG C of degassed crude viscosity more than or equal to 2000mPas and during less than 20000, a is 50～70 meters.
Table 1
Then, steam is injected in all straight wells and horizontal well, carries out steam soak and produce to formation temperature to reach the viscous Wen Qu of crude oil
The steam injection intensity of the corresponding inflection temperature of line, wherein straight well is 100～120t/m, and the steam injection intensity of horizontal well is 15～20t/m.Figure
In the recovery method of 2 heavy crude reservoirs provided for embodiment of the present invention, carry out Temperature Distribution between the well after steam soak production and illustrate
Figure, wherein 1 is the straight well of steam soak production；2 is the horizontal well of steam soak production；12 is perforated interval；21 are viscous temperature
Inflection temperature contour.As shown in Figure 2, after using straight flat combination well pattern three-dimensional heating oil reservoir, oil reservoir major part region is formed turns
The corresponding thermal communication of point temperature, for later stage fireflood production crude oil fluidity condition is provided.
In the step, wherein, the distance between horizontal well and oil reservoir bottom are 2～3 meters.The full well section of straight well is provided with perforation,
And the bottom that the top of straight well has 8～10 perforation/rice, straight well has 20 perforation/rice.Horizontal well adopts 9 inches, heatproof
600 DEG C, hang under the sleeve pipe of acid-resisting gas attack 7 inches, 600 DEG C of heatproof, the tubing string knot of the screen casing of acid-resisting gas attack
Structure.The interior oil pipe for entering a diameter of 4.5 inches down of the screen casing of horizontal well and a diameter of 1.25 inches of testing tube, all enter to water down
6～12 thermocouples are uniformly disposed in horizontal well toe-end, wherein testing tube, for level monitoring section temperature.
Steam soak latter stage (having handled up 3.5～4.5 years) can keep low speed continuous steam injection, horizontal well discharge opeing production using all straight wells
Mode, produce 0.5～1 year, with strengthen well row between heat and fluid communication degree.
Finally, the straight well in centrally located straight well well row is selected as gas injection well, in the rear well to steam injection for lighting oil reservoir
Air is continuously injected into, linear fireflood production is carried out.In the step, oil reservoir is lighted using firing technique, make reservoir temperature reach original
The threshold temperature of oil firing, starts to be continuously injected into air afterwards.The horizontal well and straight well that gas injection well row both sides distribute alternately continuously is arranged
Gas recover the oil (fireflood do not take effect well can steam soak draw effect), realize that linear fireflood is produced.
In the recovery method of the heavy crude reservoir that Fig. 3 is provided for embodiment of the present invention, well location distribution when linear fireflood is produced is carried out
Schematic diagram；In the recovery method of the heavy crude reservoir that Fig. 4 is provided for embodiment of the present invention, injection-production well when linear fireflood is produced is carried out
Between combustion front and heat front distribution schematic diagram.In Fig. 3 and Fig. 4,3 is the straight well of linear fireflood production；4 are linear fireflood life
The horizontal well of product；5 is the steam injection well of linear fireflood production；6 is combustion front；7 is heat front；8 is oil phase flowing vector.
Firing technique preferentially selects electric ignition technology, secondly can select chemic ignition technology.Burning crude oil threshold temperature is
400～450 DEG C.To light start after oil reservoir and be continuously injected into air, it is 1.5～2 × 104m3/d that well spacing is 100 meters of individual well gas injection speed,
Well spacing be 70 meters individual well gas injection speed be 1～1.5 × 104m3/d, well spacing be 50 meters individual well gas injection speed be 0.8～1.2 ×
104m3/d。
Horizontal well stable yields graduated discharge amount is 8000～10000m3/d, and lifting rate is 20～30t/d, and straight well stable yields graduated discharge amount is
4000～5000m3/d, lifting rate is 10～15t/d.The horizontal well that gas injection well row both sides distribute alternately can be adopted in exhaust process
Determine tolerance mode aerofluxuss, capacity maximum value stabilization in 8000～10000m3/d, to accelerate combustion front to the propulsion of both sides straight well
Speed, gradually forms the favourable displacement pattern of horizontal well " few gas production, liquid is adopted more ".
In the step of linear fireflood is produced, the well to the content of gas component, the wellhead temperature of producing well and producing well in producing well
Mouth pressure is continuously monitored.When there is high temperature or oxygen content close 5%, live wire direction of propulsion can be adjusted by the way of control is closed.
When the oxygen content of linear fireflood producing well is more than 5%, and there is the trend being gradually increasing, or be judged to the close producing well of combustion front
When, closing well, combustion front to next row well is moved.At the end of production, gas injection well and producing well are closed, ultimate recovery reaches
65～70%.
The recovery method of the heavy crude reservoir of present invention offer is be provided below in conjunction with embodiment.
One embodiment of the invention provides a kind of method of utilization steam soak and linear fireflood unitized production heavy crude reservoir, the viscous crude
The major oil reservoir of oil reservoir buries shallow, and average buried depth is 280m, and average core intersection is 13 meters, and porosity is 0.28, permeability
For 820mD, initial oil saturation is 73%.Initial reservoir pressure is 2.9MPa, and the original reservoir temperature is 22 DEG C.Crude oil
Viscosity is high, and degassed crude viscosity is 5 × 104mPa.s under reservoir temperature.
(1) straight well horizontal well determinant well pattern is set in production zone, and same well row straight well equidistantly distributes well spacing for 70 meters,
Straight well well is arranged and horizontal well is equidistant distributes alternately, and, away from for 50 meters, adjacent straight well well arranges straight well well spacing for adjacent straight well and Horizontal Well
For 105 meters, horizontal well horizontal section length is 210 meters.Horizontal well is located at 2 meters of oil reservoir bottom.
(2) straight well and horizontal well group type steam soak are produced：
All wells carry out steam soak production using group type steam injection mode, and wherein straight well steam injection intensity is 110t/m, and horizontal well is noted
Vapour intensity is 15t/m (horizontal segment), is produced 4～5 years, and stage recovery percent of reserves reaches 20%, and formation temperature reaches crude oil viscosity-temperature curve
65 DEG C of corresponding inflection temperature.
(3) 4 mouthfuls of centrally located straight wells are selected as gas injection well, using stable gas injection speed after electric ignition technology list fuel oil layer
Spend for 10000m3/d.Horizontal well maximum capacity is 8000m3/ d, maximum lifting rate is 40t/d, and straight well maximum capacity is
4000m3/ d, maximum lifting rate is 15t/d.Fireflood is produced 10 years, and stage recovery percent of reserves is 48.25%, and ultimate recovery is 68.55%.
Above-described embodiment, compared with the effect of recovery method of steam drive is turned after the steam soak of prior art, please be shown in Table 2,
Comparative illustration is come with windy city oil field A wellblocks Z series of strata heavy crude reservoirs.
Table 2 is windy city oil field A wellblocks Z series of strata heavy crude reservoir difference development scheme Contrast on effect table
Found out by table 2, compared with steam soak turns steam drive, the method harvesting of steam soak and linear fireflood unitized production viscous crude
Rate improves 33.29%, and ton oil running cost reduces by 700 yuan/ton, and development effectiveness and economic benefit are more preferable.
As can be seen from the above embodiments, the above-mentioned example of the present invention realizes following technique effect：
(1) combination type heavy crude producing method provided by the present invention can comprehensively utilize steam soak injection Formation heat it is many, add deep fat
The characteristics of layer scope big advantage and fireflood operation cost is low, ultimate recovery is high.
(2) the applicable oil reservoir scope of combination type heavy crude producing method provided by the present invention is wide, it is possible to increase the recoverable reserves of viscous crude.
(3) present invention carries out steam soak initially with straight well-horizontal well determinant well pattern, and the preheating of comprehensive solid is carried out to oil reservoir,
Underground crude oil viscosity is reduced, improves crude oil fluidity, stage recovery percent of reserves is up to 15～20%.Reservoir pressure is gradually lowered, oil reservoir temperature
Degree is gradually increasing.When reservoir temperature reaches the corresponding inflection temperature of crude oil viscosity-temperature curve or when Reservoir Crude Oil mobility is more than 0.1mD/
(mPs) when, reservoir pressure is down to the 1/3～1/2 of reset pressure, the startup for follow-up process of in-situ combustion is provided and can employ bar
Part.
(4) after proceeding to the linear fireflood production of horizontal well auxiliary straight well, on the one hand due to the steam soak production preheating through early stage,
The mobility of reservoir temperature and crude oil is largely increased, and overcomes between heavy crude reservoir fireflood injection-production well that filtrational resistance is big, can not form oily wall
Problem；On the other hand, gas injection is arranged using middle straight well well, the linear fireflood that live wire extend to both sides is produced, it is easy to formation compared with
The combustion front of stable and uniform propulsion, and the horizontal well positioned at oil reservoir middle and lower part can play adjustment live wire, raising vertical sweep efficiency
Effect, so as to improve producing degree of reservoir.
(5) using steam soak and linear fireflood combination type development scheme, economical and effective is produced 11～14 years, and ultimate recovery is
65～70% (wherein steam soak stage recovery percent of reserves be 15～20%, linear fireflood stage recovery percent of reserves be 45～50%), than list
Pure steam handle up recovery ratio improve 45～50%, than turn after steam soak steam drive production recovery ratio improve 30～35%.Steam soak
Stage can adopt provisional, portable injection boiler, surface line also to repeat and be used in later stage fireflood gas injection, can save big
Amount investment cost.Steam soak and linear fireflood combination type development scheme economic benefit are better than steam injection technology.
The preferred embodiments of the present invention are these are only, the present invention is not limited to, for a person skilled in the art,
The present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made, equivalent,
Improve etc., should be included within the scope of the present invention.
Claims (14)
1. a kind of recovery method of heavy crude reservoir, it is characterised in that the recovery method is comprised the following steps：
Straight well horizontal well determinant well pattern, the straight well horizontal well determinant are set in the production zone of the heavy crude reservoir
Well pattern includes that alternatively distributed straight well well is arranged and horizontal well, and well spacing a in each described straight well well row between adjacent straight well is equal
Equal, well spacing b between each described straight well and the adjacent horizontal well is equal, is located in the adjacent straight well well row
Well spacing between the adjacent described straight well of the horizontal well both sides
Steam is injected in all straight wells and the horizontal well, carries out steam soak and produce to formation temperature to reach crude oil
The corresponding inflection temperature of viscosity-temperature curve, wherein the steam injection intensity of the straight well is 100～120t/m, the steam injection of the horizontal well
Intensity is 15～20t/m；
After the steam soak production, the straight well in centrally located straight well well row is selected as gas injection
Well, air is continuously injected into the rear of oil reservoir is lighted in the steam injection well, carries out linear fireflood production.
2. recovery method according to claim 1, it is characterised in that the heavy crude reservoir meets following condition：Reservoir depth
Less than 800 meters, at 8～20 meters, oil saturation is more than 65% to core intersection, and porosity is more than 22%, and permeability is more than
300mD, 50 DEG C of degassed crude viscosity are less than 20000mPas.
3. recovery method according to claim 2, it is characterised in that the heavy crude reservoir is monolayer sandstone or sandy conglomerate bodies.
4. recovery method according to claim 2, it is characterised in that a is 50～100 meters,The horizontal well
Horizontal section length be 3a.
5. recovery method according to claim 4, it is characterised in that
When the heavy crude reservoir is less than 700mPas in 50 DEG C of degassed crude viscosity, a is 100 meters；
When the heavy crude reservoir in 50 DEG C of degassed crude viscosity more than or equal to 700mPas and during less than 2000, a is 70 meters；
When the heavy crude reservoir in 50 DEG C of degassed crude viscosity more than or equal to 2000mPas and during less than 20000, a is 50～70
Rice.
6. recovery method according to claim 1, it is characterised in that the distance between the horizontal well and oil reservoir bottom are 2～3
Rice.
7. recovery method according to claim 1, it is characterised in that the full well section of the straight well is provided with perforation, and described
The bottom that the top of straight well has 8～10 perforation/rice, the straight well has 20 perforation/rice.
8. recovery method according to claim 1, it is characterised in that the horizontal well under 9 inches of sleeve pipe using hanging 7
The tubular column structure of the screen casing of inch.
9. recovery method according to claim 8, it is characterised in that enter a diameter of 4.5 inches under in the screen casing of the horizontal well
Oil pipe and a diameter of 1.25 inches of testing tube, and the oil pipe and the testing tube enter down to the toe of the horizontal well
End, wherein uniformly 6～12 thermocouples of deployment in the testing tube.
10. recovery method according to claim 1, it is characterised in that the production time of the steam soak production is 4～5 years,
Stage recovery percent of reserves reaches 15～20%；When steam soak production was carried out to 3.5～4.5 years, using all described straight
Well carries out continuous steam injection and the horizontal well discharges into the mode of row liquid production, produces 0.5～1 year.
11. recovery methods according to claim 1, it is characterised in that in the step of linear fireflood is produced, burning crude oil
Threshold temperature is 400～450 DEG C.
12. recovery methods according to claim 5, it is characterised in that in the step of linear fireflood is produced, a is 100 meters
When, the gas injection speed in each described steam injection well is 1.5 × 104～2 × 104m3/d；When a is 70 meters, each described steam injection
Gas injection speed in well is 1 × 104～1.5 × 104m3/d；When a is 50～70 meters for a, the gas injection in each described steam injection well
Speed is 0.8 × 104～1.2 × 104m3/d。
13. recovery methods according to claim 1, it is characterised in that in the step of linear fireflood is produced, using described
The horizontal well and the straight well of gas injection well both sides carries out continuous exhaust pneumatic wallop oil recovery as producing well；Wherein, institute
It is 8000～10000m to state capacity of the horizontal well in the stable yields stage3/ d, lifting rate is 20～30t/d；The straight well is in stable yields
The capacity in stage is 4000～5000m3/ d, lifting rate is 10～15t/d；The capacity of the horizontal well and the straight well is most
Big value is 8000～10000m3/d。
14. recovery methods according to claim 3, it is characterised in that in the step of linear fireflood is produced, to the life
The well head pressure for producing the content, the wellhead temperature of the producing well and the producing well of gas component in well is continuously monitored；
When oxygen content, more than 5%, or when judging combustion front be close to the producing well, closes the producing well in the producing well.
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