CN103174403A - Gravity and steam flooding combined mining method of thick layer containing interlayer common heavy oil reservoir - Google Patents
Gravity and steam flooding combined mining method of thick layer containing interlayer common heavy oil reservoir Download PDFInfo
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Abstract
The invention provides a gravity and steam flooding combined mining method of a thick layer containing an interlayer common heavy oil reservoir. The method comprises the following steps: 1) whether geological parameters and fluid characteristics in an oil deposit block can satisfy mining conditions or not is ensured; 2) in an interlayer oil deposit block, a straight well and horizontal well combined well spacing mode is adopted, a horizontal producing well is drilled on the lower portion close to an oil layer, a steam injection straight well is arranged diagonally above the horizontal producing well, and a producing straight well is arranged in an area on the same layer with the steam injection straight well according to growing circumstances of the interlayer; 3) huff and puff are conducted simultaneously by the horizontal producing well and the steam injection straight well so that hot communication is formed by the steam injection straight well and the horizontal producing well, the reservoir pressure drops to 3-4MPa, and then steam is injected by the steam injection straight well, and production and mining are conducted by the horizontal producing well; and 4) after the oil layer on the lower portion of the interlayer is put into use basically, perforation is conducted on the parts, arranged on the upper portion of the interlayer, of the steam injection straight well and the producing straight well, steam injection well points are increased and steam quantity is improved at intervals, and production and mining are conducted simultaneously by the horizontal producing well and the producing straight well.
Description
Technical field
The present invention relates to oil exploitation technology, particularly a kind of thick-layer contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir.
Background technology
Steam soak is the main mining type of thickened oil recovery, and along with the progress of production technique, the scope of exploitation and means are also being constantly updated.At present, the method of the gravity drainage (SAGD-Steam Assisted Gravity Drainage) under auxiliary with the steam viscosity reduction for the mining of super-heavy oil deposit, this method is mainly for the sand asphalt geological conditions, and the sand asphalt Crude Oil characteristics be that high (viscosity is greater than 50,000mPa.s), large (density is greater than 0.98g/cm for density for viscosity
3), approaching with the density of water, being difficult at the prime stratum temperature flows maybe can not flow.The purpose of steam injection is mainly the heating oil reservoir, reduces viscosity of crude, and original super viscous crude that maybe can not flow that is difficult to flow can be flowed.But owing to being super viscous crude, it can not form effective plane and employ, and mainly relies on Action of Gravity Field.Its mechanism is under hot conditions, density due to the super viscous crude after the density of water under the density＜high temperature of steam＜process high temperature rectifying, under Action of Gravity Field, steam upwards flows, super viscous crude after the high-temperature-hot-water that condenses and high temperature distillation flows downward, and forms vertical shunting, and the gravity of super viscous crude is the main drive of SAGD exploitation, therefore, SAGD is for the production technique of the oil density under high temperature greater than the super viscous crude of water.
Common heavy oil also claims by " heavy oil ", is that under reservoir temperature, degassed crude viscosity is greater than 100mPa.s, and less than the crude oil of 10,000mPa.s, its relative density is greater than 0.92, less than 0.95.At present, the viscous crude annual production of China surpasses more than 1,300 ten thousand tons, main force's oil reservoir that its medium bed heavy crude reservoir is viscous crude, as Liaohe River promotion oil reservoir, the oil field, Dan Jia temple etc. of winning, oil in place surpasses 300,000,000 tons, and this reservoir oil layer thickness is large, generally at 30-1000 rice, and adopting the recovery ratio of steam soak to only have 20% left and right, common oil reservoir injection steam exploitation effect is bad.And on same vertical plane, SAGD is better with employing effect on vertical between the horizontal well of a pair of up and down due to most of producing wells in the SAGD method and steam injection well location, but in the horizontal direction, between injection-production well, larger distance can not be arranged.
For the problems referred to above, known have a kind of gravity-assisted steam flooding method (patent No.: ZL200610089238.1) for heavy laver common heavy oil reservoir.It adopts straight well and horizontal combination hole pattern or two horizontal well combination hole pattern, and the vertical and horizontal well combination mode is to bore level of production well in the oil reservoir bottom, and the steam injection straight well is positioned at the oblique upper of horizontal production well; Two horizontal well modes are at the aboveground drill with ferrule steam injection of level of production horizontal well.By steam injection straight well steam injection, producing well production is developed.
Because gravity-assisted steam flooding method draining is by steam injection straight well steam injection, producing well production, so between draining space and injection-production well, the draining passage will determine production effect.In heavy laver common heavy oil reservoir, grow continuously at oil reservoir, when growing, draining passage and draining space in expedite situation, can obtain good development effectiveness.But if exist the non-physical property of large tracts of land noncontinuity in the oil reservoir block when interlayer, draining space and draining passage all will be affected.Due to poor every the interlayer heat conductivility, steam can't effectively heat every the above oil reservoir of interlayer, form draining passage probability between injection-production well and diminish with causing after the existence of interlayer, having produced thus oil reservoir can't effectively be employed, and affects the problem of gravity-assisted steam flooding method development effectiveness and final oil recovery.
Summary of the invention
The present invention is containing for thick-layer when the interlayer common heavy oil reservoir uses straight horizontal well combination gravity-assisted steam flooding method to exploit to produce in order to solve, and completes every the difficult problem that interlayer top oil reservoir can't be employed.The object of the present invention is to provide a kind of thick-layer to contain gravity and steam flooding unitized production method every the interlayer common heavy oil reservoir, it can be realized that thick-layer contains every the integral body of interlayer common heavy oil reservoir with lower steam injection cost and employ exploitation, oil reservoir is effectively employed, improve final oil recovery, improve development effectiveness.
The present invention adopts following technical scheme:
1) determine that gravity and steam flooding power that known oil reservoir block geologic parameter and common heavy oil fluid behaviour satisfy common heavy oil unites the driving mining conditions;
2) in interlayer heavy crude reservoir block, adopt the vertical and horizontal well combination mode, boring horizontal production well near the oil reservoir bottom, make the steam injection straight well be positioned at the horizontal production well oblique upper, and produce straight well according to disposing with zone, layer position at the steam injection straight well every the interlayer developmental state;
3) horizontal production well and steam injection straight well are handled up simultaneously, so that steam injection straight well and horizontal production well form thermal communication, and reservoir pressure drops to 3-4MPa, transfers afterwards steam injection straight well steam injection to, and horizontal production well is produced exploitation;
4) after substantially being employed every interlayer bottom oil reservoir, to the steam injection straight well with produce the partial completion every interlayer top of being positioned at of straight well, and intermittently increase the steam injection well point and improve the steam injection amount, horizontal production well with produce straight well and produce simultaneously exploitation.
The present invention also adopts following technical scheme:
In described step 3) in, horizontal production well and steam injection straight well are handled up 1-5 cycle simultaneously, are preferably 2-4 cycle.
In described step 4) in, perforation length is 8m, the steam injection straight well is 0m with producing the vertical distance of straight well perforation, eyelet with perpendicular to the mode of each pit shaft axis with respect to each pit shaft Spiral distribution, and in the perforation to the steam injection straight well, with the shot density of producing the straight well correspondence direction greater than the shot density at non-correspondence direction.
In described step 1) in, determine that known oil reservoir block geologic parameter is: reservoir parameter is greater than 10m continuously, and exist the large tracts of land noncontinuity every interlayer, every thickness of interlayer less than 10m, for shale, aleuritic texture every interlayer, the oil reservoir degree of porosity is greater than 20%, and permeability is greater than 500md, and the ratio of vertical permeability and horizontal permeability is greater than 0.2.
In described step 1) in, determine that known oil reservoir block common heavy oil fluid behaviour is: under reservoir temperature degassed crude viscosity greater than 100mPa.s and less than 10,000mPa.s, the crude oil of relative density greater than 0.92, less than 0.95; When oil reservoir Gao Konggao oozes, can also expand to the special viscous crude between common heavy oil and super viscous crude, described special viscous crude be under reservoir temperature degassed crude viscosity greater than 10,000mPa.s and less than 50,000mPa.s, the crude oil of relative density greater than 0.95, less than 0.98.
In described step 2) in, the vertical distance between steam injection straight well and horizontal production well is 5m-30m, and horizontal range is 30m-100m, and steam injection straight well and the vertical distance of producing between straight well be 0m, and horizontal range is 35-70m.
In described step 2) in, steam injection straight well and production straight well are new boring or existing straight well.
In described step 3) in, the steam injection speed of steam injection straight well is 1.5-1.8t/ha.m.d, and the shaft bottom steam quality is greater than 50%, and comprehensive production-injection ratio remains on more than 1.2.
In described step 4) in, the steam injection speed of steam injection straight well is 1.5-1.8t/ha.m.d, and the shaft bottom steam quality is greater than 50%, and comprehensive production-injection ratio remains on more than 1.2.
Be not difficult to find out by technique scheme, the present invention is containing for thick-layer in the exploitation of interlayer common heavy oil reservoir, at first to steam injection straight well steam injection so that the crude oil every the interlayer bottom is carried out displacement, crude oil is exploited out by horizontal production well under the gravity-assisted steam flooding principle, realized thus employing every interlayer bottom oil reservoir.After substantially being employed every interlayer bottom oil reservoir, by in steam injection straight well top perforation and steam injection, crude oil every interlayer top is carried out displacement, a part of crude oil is leaked into below interlayer and by the horizontal production well extraction under the gravity-assisted steam flooding principle by seepage channel, another part crude oil under the effect of steam flooding principle every interlayer top by producing the perforated interval extraction of straight well, thereby solved the difficult problem that can't employ every interlayer top oil reservoir.Thus, by above method, can realize that thick-layer contains every the integral body of interlayer common heavy oil reservoir with lower steam injection cost and employ exploitation, oil reservoir is effectively employed, improve final oil recovery, improve development effectiveness.
Description of drawings
Fig. 1 is the schematic diagram of straight well of the present invention and horizontal well layout.
Fig. 2 is that driving force of the present invention is analyzed schematic diagram.
Fig. 3 is the schematic diagram of perforation mode of the present invention and development scheme.
The specific embodiment
Straight well and horizontal well combination exploitation oil reservoir are only a kind of hole patterns, and the drilling technology of straight well and horizontal well has been arranged, and the selection in the various combination and exploitations of straight well and horizontal well oil field has just been arranged.Thick-layer of the present invention contains every the gravity of interlayer common heavy oil reservoir and steam flooding unitized production method, contain in the interlayer common heavy oil reservoir at thick-layer, adopt the vertical and horizontal well combination method, after substantially employing every interlayer bottom oil reservoir, to the steam injection straight well with produce the partial completion every interlayer top of being positioned at of straight well, then steam injection straight well steam injection, increase the steam injection well point and improve the steam injection amount, and recover normal steam injection after reaching the steam injection designing requirement, so that horizontal production well and production straight well are produced exploitation continuously.
Fig. 1 is the schematic diagram of straight well of the present invention and horizontal well layout, and Fig. 2 is that driving force of the present invention is analyzed schematic diagram.As shown in Figure 1, the present invention contains in the interlayer common heavy oil reservoir at thick-layer, adopts steam injection straight well steam injection, and horizontal well and the mode of producing straight well production are realized effectively employing every interlayer top and the bottom oil reservoir.In addition, as shown in Figure 2, due to the flowable of common heavy oil, in recovery process, the major impetus of horizontal production well exploitation is that vapour drives pressure, and auxiliary driving force is gravity; The major impetus of producing the straight well exploitation is that vapour drives pressure.
The concrete following steps that adopt:
1) determine to contain feasibility every interlayer common heavy oil reservoir gravity and steam flooding power unitized production mode according to known reservoir geology parameter and common heavy oil fluid behaviour;
2) in the oil reservoir block, adopt straight well and horizontal combination hole pattern.As shown in Figure 1, boring horizontal production well near the oil reservoir bottom, at the horizontal well oblique upper, bore the steam injection straight well with the vertical of horizontal well apart from 10m left and right, place, horizontal range 50m left and right; In layer suitable for steam injection straight well position, namely the vertical distance with the steam injection straight well is about 0m, and horizontal range 70m bores at the place and produces straight well;
3) horizontal production well and steam injection straight well are handled up the 2-4 cycle simultaneously, make steam injection straight well and horizontal production well form thermal communication, and reservoir pressure drops to 3-4MPa, steam injection straight well continuous steam injection afterwards, horizontal production well is produced continuously, steam injection speed is 1.5-1.8t/ha.m.d, and the shaft bottom steam quality is greater than 50%, and comprehensive production-injection ratio remains on more than 1.2;
4) after substantially being employed every interlayer bottom oil reservoir, to the steam injection straight well with produce the partial completion every interlayer top of being positioned at of straight well, and intermittent steam injection well point and the raising steam injection amount of increasing, recover afterwards normal steam injection amount, horizontal production well is produced exploitation simultaneously with the production straight well, steam injection speed is 1.5-1.8t/ha.m.d, and the shaft bottom steam quality is greater than 50%, and comprehensive production-injection ratio remains on more than 1.2.
Reservoir geology parameter of the present invention is that reservoir parameter greater than 10m, exists continuously every interlayer continuously, less than 10m, every interlayer, the oil reservoir degree of porosity is greater than 20% for shale, aleuritic texture every thickness of interlayer, permeability is greater than 500md, and the ratio of vertical permeability and horizontal permeability is greater than 0.2.
Described common heavy oil characteristic of fluid is, under reservoir temperature degassed crude viscosity greater than 100mPa.s and less than 10,000mPa.s, the crude oil of relative density greater than 0.92, less than 0.95.When oil reservoir Gao Konggao oozes, can also expand to the special viscous crude between common heavy oil and super viscous crude, described special viscous crude be under reservoir temperature degassed crude viscosity greater than 10,000mPa.s and less than 50,000mPa.s, the crude oil of relative density greater than 0.95, less than 0.98.
In addition, Fig. 3 shows described step 4) in the perforation mode and the schematic diagram of development scheme.Wherein, the perforation mode be eyelet with perpendicular to the mode of pit shaft axis with respect to each pit shaft Spiral distribution.And, in the perforation to the steam injection straight well, with the shot density of producing the straight well correspondence direction greater than the shot density at non-correspondence direction, make thus the perforated interval extraction of being produced straight well under the easier steam flooding effect at the steam injection straight well of crude oil on interlayer top.In addition, the steam injection straight well is 0m with producing the vertical distance of straight well perforation, and the perforation position, the end, top and the position, the end, steam injection straight well perforation top that namely produce straight well are basic identical.
In addition, step 4) " intermittent increase the steam injection well point and improve the steam injection amount " in refers to organize the steam injection straight well and produces straight well steam injection simultaneously when producing straight well production effect variation, day of steam injection straight well wants high during steam injection amount compared with normal steam injection, and periodicity enforcement; Specifically determined by the straight well production cycle interval time of intermittent indication, and and between perforation without obvious relation between persistence, organize steam injection when producing straight well production effect variation, usually carried out 3-4 month; Increase steam injection well point and steam injection amount and be mainly in order to improve oil reservoir bulk temperature field, to improve between steam injection straight well and production straight well available heat UNICOM degree, to improve development effectiveness.The intermittent method that improves the steam injection amount has two: the one, increase the steam injection well point, and the 2nd, utilize existing Special Equipment to improve the steam injection discharge capacity of steam injection straight well.And, in described step 4) in, normal steam injection amount is the steam injection straight well steam injection amount of value when pointing to the draining space and not arriving top every interlayer bottom oil reservoir.
In addition, steam injection straight well and the partial completion that is arranged in every interlayer top of producing straight well are not limited in step 4) carry out, for example also can be in step 4) before, for example carry out the steam injection straight well in the partial completion of interlayer bottom and produce the partial completion every interlayer top of being positioned at of straight well the steam injection straight well is positioned at.But adopt this kind method comparatively loaded down with trivial details on to the control of mining progress, therefore be preferably in step 4) in carry out the steam injection straight well and produce the partial completion every interlayer top of being positioned at of straight well.
Be not difficult to find out by technique scheme, the present invention is containing for thick-layer in the exploitation of interlayer common heavy oil reservoir, at first to steam injection straight well steam injection so that the crude oil every the interlayer bottom is carried out displacement, crude oil is exploited out by horizontal production well under the gravity-assisted steam flooding principle, realized thus employing every interlayer bottom oil reservoir.After substantially being employed every interlayer bottom oil reservoir, by in steam injection straight well top perforation and steam injection, crude oil every interlayer top is carried out displacement, a part of crude oil is leaked into below interlayer and by the horizontal production well extraction under the gravity-assisted steam flooding principle by seepage channel, another part crude oil under the effect of steam flooding principle every interlayer top by producing the perforated interval extraction of straight well, thereby solved the difficult problem that can't employ every interlayer top oil reservoir.Thus, by above method, can realize that thick-layer contains every the integral body of interlayer common heavy oil reservoir with lower steam injection cost and employ exploitation, oil reservoir is effectively employed, improve final oil recovery, improve development effectiveness.
The below provides and has used two examples of the present invention.
Example 1: certain oil field oil reservoir VI sand body is thick-layer shape common heavy oil reservoir, and 50 ℃ of lower degassed crude viscosity are 2284.2mPa.s, and oil reservoir average thickness 38.89m generally grows every interlayer in oil reservoir, average thickness 2.4m, and main component is argillaceous siltstoue.This oil reservoir adopts the straight well steam soak on average to reach 7 cycles, and strata pressure drops to 1.0MPa from original value 16.1MPa, and cycle oil production and gas oil ratio reduce.For geologic feature, oil property and the exploitation present situation of this oil reservoir, adopt the vertical and horizontal well combination mode to develop in the steps below:
(1) carry out coarse screening according to reservoir geology parameter and characteristic of fluid;
(2) due to continuous core intersection greater than 10m, degree of porosity is greater than 20%, and permeability is greater than 500md, and the ratio of vertical permeability and horizontal permeability is greater than 0.2, grow in flakes shale, aleuritic texture in oil reservoir every interlayer, therefore determine to adopt gravity and steam flooding associating driving method;
(3) because this oil field is to have utilized straight well to carry out the oil reservoir of exploitation, therefore adopt straight well and horizontal well combination well spacing, squeezing into horizontal production well near the oil reservoir bottom, at the oblique upper of horizontal well, vertical apart from 15m, horizontal range 70m place brill steam injection straight well with horizontal well; Pierce the production straight well in steam injection straight well layer position, produce straight well and steam injection straight well vertical apart from 0m, horizontal range 70m;
(4) through after preheating to steam injection straight well steam injection, horizontal production well is produced continuously, steam injection speed is 1.5t/ha.m.d, the shaft bottom steam quality is greater than 50%, production-injection ratio remains on more than 1.2;
(5) after producing 200 days continuously, monitoring materials shows when the draining space has reached top every interlayer bottom oil reservoir, to the steam injection straight well with produce the partial completion every interlayer top of being positioned at of straight well, perforation length is 8m, and the steam injection straight well is 0m with producing the vertical distance of straight well perforation;
(6) the corresponding steam injection straight well of single horizontal production well increases to 6 mouthfuls of wells, and the steam injection amount rises 80%, is recovering normal steam injection amount after 60 days with this state continuous steam injection, and horizontal production well is produced exploitation simultaneously with the production straight well.
Unite to drive and produce by making this oil reservoir sand body VI oil reservoir change gravity and steam flooding into after steam soak, after exploitation, straight well and horizontal well combination S AGD can improve crude oil tar productivity 30%, the accumulative total gas oil ratio can reach 0.26, add the recovery percent of reserves (30.5%) during handling up, total tar productivity can reach 61%.
Example 2: certain oil field oil reservoir sand body is thick-layer shape common heavy oil reservoir, reservoir buried depth 750-800m, and 50 ℃ of lower degassed crude viscosity are 1680mPa.s, and oil reservoir average thickness 31m generally grows every interlayer in oil reservoir, and average thickness 1.7m is mainly argillaceous siltstoue.This oil reservoir adopts the straight well steam soak on average to reach 7 cycles, and strata pressure drops to 1.5MPa from original value 7.35MPa, and cycle oil production and gas oil ratio reduce.For geologic feature, oil property and the exploitation present situation of this oil reservoir, adopt the vertical and horizontal well combination mode to develop according to the following steps.
(1) carry out coarse screening according to reservoir geology parameter and characteristic of fluid;
(2) due to continuous core intersection greater than 10m, degree of porosity is greater than 20%, and permeability is greater than 500md, and the ratio of vertical permeability and horizontal permeability is greater than 0.2, grow in flakes shale, aleuritic texture in oil reservoir every interlayer, therefore determine to adopt gravity and steam flooding associating driving method;
(3) because this oil field is to have utilized straight well to carry out the oil reservoir of exploitation, therefore adopt straight well and horizontal well combination well spacing, squeezing into horizontal production well near the oil reservoir bottom, at the oblique upper of horizontal well, vertical apart from 9m, horizontal range 35m place brill steam injection straight well with horizontal well; Pierce the production straight well in steam injection straight well layer position, produce straight well and steam injection straight well horizontal range 70m, vertical range averaging 0.3m;
(4) through after preheating to the straight well steam injection, horizontal production well is produced continuously, steam injection speed is 1.5t/ha.m.d, the shaft bottom steam quality is greater than 50%, production-injection ratio remains on more than 1.2;
(5) after producing 100 days continuously, draining space, monitoring materials display part has reached when the top of interlayer bottom oil reservoir, in the zone is grown in the vapour chamber to steam injection straight well dead chick hole above interlayer, perforation length 8m, adopt same perforation mode every interlayer top perforation to producing straight well, perforation length 8m, the steam injection straight well is 0m with producing the vertical distance of straight well perforation;
(6) the corresponding steam injection straight well of single horizontal production well increases to 6 mouthfuls of wells, and the steam injection amount rises 65%, is recovering normal steam injection amount after 50 days with this state continuous steam injection, and horizontal production well is produced exploitation simultaneously with the production straight well.
Observe the well temperature profile after implementing, can see that reservoir temperature obviously rises above interlayer, oil reservoir is effectively employed, and before implementing, individual well group day produce oil increases by 11 tons.
Unite to drive and produce by making this reservoir oil layer change gravity and steam flooding into after steam soak, after exploitation, straight well and horizontal well combination S AGD can improve crude oil tar productivity 35%, the accumulative total gas oil ratio can reach 0.25, add the recovery percent of reserves (25%) during handling up, total tar productivity can reach 60%.
Claims (9)
1. a thick-layer contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that, it comprises the following steps:
1) determine that gravity and steam flooding power that known oil reservoir block geologic parameter and common heavy oil fluid behaviour satisfy common heavy oil unites the driving mining conditions;
2) in interlayer heavy crude reservoir block, adopt the vertical and horizontal well combination mode, boring horizontal production well near the oil reservoir bottom, make the steam injection straight well be positioned at the horizontal production well oblique upper, and produce straight well according to disposing with zone, layer position at the steam injection straight well every the interlayer developmental state;
3) horizontal production well and steam injection straight well are handled up simultaneously, so that steam injection straight well and horizontal production well form thermal communication, and reservoir pressure drops to 3-4MPa, transfers afterwards steam injection straight well steam injection to, and horizontal production well is produced exploitation;
4) after substantially being employed every interlayer bottom oil reservoir, to the steam injection straight well with produce the partial completion every interlayer top of being positioned at of straight well, and intermittently increase the steam injection well point and improve the steam injection amount, horizontal production well with produce straight well and produce simultaneously exploitation.
2. thick-layer according to claim 1 contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that,
In described step 3) in, horizontal production well and steam injection straight well are handled up 1-5 cycle simultaneously, are preferably 2-4 cycle.
3. thick-layer according to claim 1 contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that,
In described step 4) in, perforation length is 8m, the steam injection straight well is 0m with producing the vertical distance of straight well perforation, eyelet with perpendicular to the mode of each pit shaft axis with respect to each pit shaft Spiral distribution, and in the perforation to the steam injection straight well, with the shot density of producing the straight well correspondence direction greater than the shot density at non-correspondence direction.
4. the described thick-layer of any one according to claim 1 to 3 contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that,
In described step 1) in, determine that known oil reservoir block geologic parameter is: reservoir parameter is greater than 10m continuously, and exist the large tracts of land noncontinuity every interlayer, every thickness of interlayer less than 10m, for shale, aleuritic texture every interlayer, the oil reservoir degree of porosity is greater than 20%, and permeability is greater than 500md, and the ratio of vertical permeability and horizontal permeability is greater than 0.2.
5. the described thick-layer of any one according to claim 1 to 3 contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that,
In described step 1) in, determine that known oil reservoir block common heavy oil fluid behaviour is: under reservoir temperature degassed crude viscosity greater than 100mPa.s and less than 10,000mPa.s, the crude oil of relative density greater than 0.92, less than 0.95; When oil reservoir Gao Konggao oozes, can also expand to the special viscous crude between common heavy oil and super viscous crude, described special viscous crude be under reservoir temperature degassed crude viscosity greater than 10,000mPa.s and less than 50,000mPa.s, the crude oil of relative density greater than 0.95, less than 0.98.
6. the described thick-layer of any one according to claim 1 to 3 contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that,
In described step 2) in, the vertical distance between steam injection straight well and horizontal production well is 5m-30m, and horizontal range is 30m-100m, and steam injection straight well and the vertical distance of producing between straight well be 0m, and horizontal range is 35-70m.
7. the described thick-layer of any one according to claim 1 to 3 contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that,
In described step 2) in, steam injection straight well and production straight well are new boring or existing straight well.
8. the described thick-layer of any one according to claim 1 to 3 contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that,
In described step 3) in, the steam injection speed of steam injection straight well is 1.5-1.8t/ha.m.d, and the shaft bottom steam quality is greater than 50%, and comprehensive production-injection ratio remains on more than 1.2.
9. the described thick-layer of any one according to claim 1 to 3 contains gravity and the steam flooding unitized production method every the interlayer common heavy oil reservoir, it is characterized in that,
In described step 4) in, the steam injection speed of steam injection straight well is 1.5-1.8t/ha.m.d, and the shaft bottom steam quality is greater than 50%, and comprehensive production-injection ratio remains on more than 1.2.
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| CN109613214A (en) * | 2019-01-15 | 2019-04-12 | 中国地质大学（北京） | For studying interlayer to the experimental provision of SAGD mining effect |
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| CN110984936A (en) * | 2019-12-23 | 2020-04-10 | 中国石油大学(华东) | Preheating method for improving single horizontal well SAGD (steam assisted gravity drainage) exploitation efficiency |
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