CN104975834A - Steam-carbon dioxide assisted gravity oil drainage oil production method - Google Patents
Steam-carbon dioxide assisted gravity oil drainage oil production method Download PDFInfo
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- CN104975834A CN104975834A CN201410133711.6A CN201410133711A CN104975834A CN 104975834 A CN104975834 A CN 104975834A CN 201410133711 A CN201410133711 A CN 201410133711A CN 104975834 A CN104975834 A CN 104975834A
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Abstract
The invention provides a steam-carbon dioxide assisted gravity oil drainage oil production method, which comprises the following steps of: 1, preheating two horizontal wells in parallel distribution; 2, injecting steam into the upper part horizontal well, and maintaining the original formation pressure in the lower part horizontal well for production; 3, simultaneously injecting the steam and carbon dioxide into an oil layer through the upper part horizontal well, and maintaining the original formation pressure in the lower part horizontal well for production; and 4, stopping the carbon dioxide injection, continuously injecting the steam into the upper part horizontal well, and continuously performing production in the lower part horizontal well. The steam-carbon dioxide assisted gravity oil drainage oil production method has the advantage that through a steam assisted gravity oil discharge technology for reducing the crude oil viscosity, reducing the shaft heat loss and improving the steam enthalpy through adding the carbon dioxide, the recovery ratio of a super-heavy oil reservoir can be improved.
Description
Technical field
The present invention relates to oil extraction in oil field technical field, particularly a kind of method utilizing steam-carbon dioxide assisted gravity drainage to improve super-thick oil reservoir recovery efficiency.
Background technology
Viscous crude oil in place 6.4 × 10 verified at present by Shengli Oil Field
8t, wherein eastern oil region verifies viscous crude oil in place 5.89 × 10
8t, employs 4.69 × 10 at present
8t; Western oily district finds spring breeze, light of spring oil field in succession, verifies oil in place 5128 × 10
4t, employs 2471 × 10 at present
4t.
Triumph light of spring oil field, western oily district reports control and prognostic reserves 5,333 ten thousand tons for 2011, but substantially cannot employ with prior art, mainly due to:
1, viscosity of crude is very big, and under formation temperature, (23 DEG C) degassed crude viscosity is close to 2000 × 10
4mPas, belongs to super―heavy oil oil reservoir.Conventional steam is handled up because steam injection filtrational resistance is large, and heating radius is little, cannot break through production capacity.
2, core intersection little (10-25m), is in the lower limit standard (15m) of conventional steam assisted gravity drainage techniques, and steam injection causes top bottom layer heat waste large, and the vapor chamber volume of formation is little, affects development effectiveness.
For such super―heavy oil oil reservoir, once carried out thinner and assist the multiple production technique such as straight well steam soak, thinner auxiliary water horizontal well steam soak, but all because viscosity of crude is high, development effectiveness is poor and cannot effectively employ.The external ripe super―heavy oil oil reservoir development technology of investigation, mainly contains steam assisted gravity drainage techniques (SAGD).This technology is particularly suitable for exploiting has certain core intersection and the very high super―heavy oil oil reservoir of viscosity of crude or natural asphalt.This technology in Canadian UTF trial zone, Surmount oil field, East Senlac oil field, multiple field use such as Makay River oil field, obtain huge success, recovery ratio can reach 50%-60%.
But the reservoir oil layer physical property of external enforcement SAGD is good, continuous core intersection is large, and oil reservoir homogenieity is good, and vertical permeability is large, and viscosity of crude is less than 500 × 10
4mPas.Domestic light of spring oil-field thick-oil reservoir condition differs comparatively large with external reservoir condition, oil viscosity is greatly one of topmost difference, close to 2000 × 10
4mPas, much larger than external similar oil reservoir, cause steam injection filtrational resistance large, heating radius is little, and conventional SAGD development technique is still difficult to effectively employ the so large oil reservoir of viscosity.
Explore the cost-effective development scheme of such oil reservoir, improve reserves exploitation rate and recovery ratio, meet the needs of the growing energy demand of people and the guarantee national economic development, be of great immediate significance.We have invented a kind of new steam-carbon dioxide assisted gravity drainage oil production method for this reason, solve above technical problem.
Summary of the invention
The object of this invention is to provide a kind of by adding the steam assisted gravity drainage techniques that carbon dioxide reduces viscosity of crude, reduces wellbore heat loss, improves steam enthalpy, improving the method for super-thick oil reservoir recovery efficiency.
Object of the present invention realizes by following technical measures: steam-carbon dioxide assisted gravity drainage oil production method, and this steam-carbon dioxide assisted gravity drainage oil production method comprises: step 1, and the horizontal well of two mouthfuls of parallel distributions is carried out preheating; Step 2, injects steam to top horizontal well, and lower horizontal well keeps original formation pressure to produce; Step 3, injects oil reservoir by upper water horizontal well by steam and carbon dioxide simultaneously, and lower horizontal well keeps original formation pressure to produce; And step 4, stop carbon dioxide injection, continue to inject steam to top horizontal well, lower horizontal well continues to produce.
Object of the present invention also realizes by following technical measures:
In step 1, in heavy crude reservoir oil reservoir, dispose about 2 mouthfuls just to parallel level distribution well, position is bottom oil reservoir, and two mouthfuls of wells keep certain distance, adopts steam injection cyclic preheat technology to carry out preheating.
In step 1, preheating time is 3-4 month.
In step 1, two mouthfuls of water horizontal wells all adopt double tube structure, wherein, the steam injection of long oil pipe, steam injection rate remains on 50-80t/d; Short oil pipe stable bottom hole pressure discharge opeing simultaneously, upper water horizontal well is a little more than lower horizontal well, and pressure reduction is 0.1MPa-0.2MPa.
In step 2, in top horizontal well long oil pipe and short oil pipe, inject well head steam quality is continuously the steam of 90% simultaneously, steam injection rate 100-150t/d.
In step 3, steam is by injecting continuously in upper water horizontal well long oil pipe and short oil pipe simultaneously, and well head steam quality is 90%, steam injection rate 80-120t/d; Carbon dioxide is injected by casing annulus, injection rate 120-180Nm
3/ h
In step 2, the steam injection time is 2-3 month.
In step 3, steam and carbon dioxide are injected 20-30d continuously.
In step 4, after stopping carbon dioxide injection, continue steam injection and discharge opeing production 40-60d, working system remains unchanged.
This steam-carbon dioxide assisted gravity drainage oil production method also comprises, and after step 4, repeats step 3 and step 4, recovers the oil with assisted gravity drainage.
The present invention provides a kind of new method for super―heavy oil oil reservoir development improves oil recovery factor, and be applicable to oil reservoir buried depth and be less than 1000m, oil reservoir continuous effective thickness is not less than 20m, and under reservoir condition, degassed crude viscosity is greater than 10 × 10
4the oil reservoir of mPas.Carbon dioxide can be gathered in top and the edge of vapor chamber, reduces the heat waste of vapor chamber and cap rock, extenuates steam-condensation speed, and then contribute to the expansion of vapor chamber, and can increase stratum energy.Carbon dioxide can with in-place oil contact lysis, crude oil volume is significantly expanded, increases crude oil elastic energy, be conducive to improving elasticity output.In addition, carbon dioxide also has certain viscosity reduction effect and removes near wellbore zone contamination and plugging, and dredging oil flow channel, serves the effect of good suggestions for improvement.The present invention be steam is helped with the energization of carbon dioxide arrange, a kind of intensified oil reduction technology of assisted gravity drainage that viscosity reduction, heat insulation compound action mechanism combine.
Accompanying drawing explanation
Fig. 1 is the flow chart of a specific embodiment of steam of the present invention-carbon dioxide assisted gravity drainage oil production method;
Fig. 2 is warm-up phase model schematic in a specific embodiment of the present invention.
Fig. 3 is production phase model schematic in a specific embodiment of the present invention.
Detailed description of the invention
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
As shown in Figure 1, Fig. 1 is the flow chart of a specific embodiment of steam of the present invention-carbon dioxide assisted gravity drainage oil production method.
In step 101, the horizontal well of two mouthfuls of parallel distributions is carried out preheating.In heavy crude reservoir oil reservoir, dispose about 2 mouthfuls just to parallel level distribution well, position is bottom oil reservoir, and two mouthfuls of wells keep certain distance.Adopt steam injection cyclic preheat technology.Two mouthfuls of water horizontal wells all adopt double tube structure.Wherein, the steam injection of long oil pipe, steam injection rate remains on 50-80t/d; Short oil pipe stable bottom hole pressure discharge opeing simultaneously, upper water horizontal well is a little more than lower horizontal well, and pressure reduction is 0.1MPa-0.2MPa.3-4 month preheating time.Fig. 2 represents step 101 warm-up phase schematic diagram, vapor chamber is produced respectively by upper and lower horizontal well steam injection cyclic preheat, because upper level well stream pressure is higher than lower horizontal well, upper water horizontal well vapor chamber is developed downwards, upper water horizontal well vapor chamber upwards develops, after two vapor chamber realize connection, preheating success.Flow process enters into step 102.
In step 102, in top horizontal well long oil pipe and short oil pipe, inject well head steam quality is continuously the steam of 90% simultaneously, steam injection rate 100-150t/d, steam injection time 2-3 month.Bottom producing well keeps original formation pressure to produce.Flow process enters into step 103.
In step 103, steam and carbon dioxide are injected oil reservoir by upper water horizontal well simultaneously, injects 20-30d continuously.Wherein, steam is by injecting continuously in upper water horizontal well long oil pipe and short oil pipe simultaneously, and well head steam quality is 90%, steam injection rate 80-120t/d; Carbon dioxide is injected by casing annulus, injection rate 120-180Nm
3/ h.Lower horizontal well keeps original formation pressure to produce.Flow process enters into step 104.
In step 104, stop carbon dioxide injection, upper water horizontal well continues to inject steam, and lower horizontal well proceeds to produce 40-60d, and working system remains unchanged.
Fig. 3 represents step 102-104 production phase schematic diagram.Now, steam upwards and sideways expansion, progressively expands and forms vaporium.Due to the acting in conjunction of steam and carbon dioxide, viscosity of crude declines to a great extent, crude oil under gravity with together extraction in condensation flow to bottom producing well.
In one embodiment, after step 104, repeat step 103-104, recover the oil with assisted gravity drainage.
In an application specific embodiment of the present invention, include following steps:
(1) preparation:
Dispose horizontal well 2 mouthfuls, upper water horizontal well 300m, lower horizontal well 300m, two mouthfuls of well fore-and-aft distance 5m.Every mouthful of well adopts length insulated tubing pipe string technology.
(2) warm-up phase:
A, in 2 mouthfuls of water horizontal wells long oil pipe inject steam, steam injection speed 60t/d, well head steam injection mass dryness fraction remains on more than 90%.
B, short oil pipe stable bottom hole pressure production discharge opeing.
C, top produce well stream pressure for 3.4MPa, and bottom produces well stream pressure 3.2MPa.
D, preheating time 120d.
(3) production phase:
A, 2 mouthfuls of producing wells stop steam injection discharge opeing.
B, in top horizontal well long oil pipe and short oil pipe, simultaneously continuously inject well head steam quality be the steam of 90%, steam injection rate 100t/d, 2 months steam injection time.Bottom producing well keeps original formation pressure to produce.
C, in the horizontal well long oil pipe of top, inject continuously the steam of mass dryness fraction 90%, steam injection speed 90t/d; Meanwhile, injecting carbon dioxide in annular space, injection rate 130Nm
3/ h, injection length 20d, lower horizontal well adopts the huge discharge belt type pumping unit of long stroke, low jig frequency, and keeps flowing bottomhole pressure (FBHP) 3.5MPa to carry out discharge opeing production.
D, stopping carbon dioxide injection, continue to inject steam and discharge opeing production 40d, working system remains unchanged.
E, repetition step C and D.
In application another specific embodiment of the present invention, include following steps:
(1) preparation:
Dispose horizontal well 2 mouthfuls, upper water horizontal well 500m, lower horizontal well 500m, two mouthfuls of well fore-and-aft distance 5m.Every mouthful of well adopts length insulated tubing pipe string technology.
(2) warm-up phase:
A, in 2 mouthfuls of water horizontal wells long oil pipe inject steam, steam injection speed 80t/d, well head steam injection mass dryness fraction remains on more than 90%.
B, short oil pipe stable bottom hole pressure production discharge opeing.
C, top produce well stream pressure for 3.5MPa, and bottom produces well stream pressure 3.4MPa.
D, preheating time 90d.
(3) production phase:
A, 2 mouthfuls of producing wells stop steam injection discharge opeing.
B, in top horizontal well long oil pipe and short oil pipe, simultaneously continuously inject well head steam quality be the steam of 90%, steam injection rate 120t/d, 3 months steam injection time.Bottom producing well keeps original formation pressure to produce.
C, in the horizontal well long oil pipe of top, inject continuously the steam of mass dryness fraction 90%, steam injection speed 120t/d; Meanwhile, injecting carbon dioxide in annular space, injection rate 180Nm
3/ h, injects 30d continuously.Lower horizontal well adopts the huge discharge belt type pumping unit of long stroke, low jig frequency, and keeps flowing bottomhole pressure (FBHP) 3.5MPa to produce.
D, stopping carbon dioxide injection, continue inject steam and produce 60d, working system remains unchanged.
E, repetition step C and D.
Claims (10)
1. steam-carbon dioxide assisted gravity drainage oil production method, is characterized in that, this steam-carbon dioxide assisted gravity drainage oil production method comprises:
Step 1, carries out preheating by the horizontal well of two mouthfuls of parallel distributions;
Step 2, injects steam to top horizontal well, and lower horizontal well keeps original formation pressure to produce;
Step 3, injects oil reservoir by upper water horizontal well by steam and carbon dioxide simultaneously, and lower horizontal well keeps original formation pressure to produce; And
Step 4, stops carbon dioxide injection, continues to inject steam to top horizontal well, and lower horizontal well continues to produce.
2. steam according to claim 1-carbon dioxide assisted gravity drainage oil production method, it is characterized in that, in step 1, in heavy crude reservoir oil reservoir, dispose about 2 mouthfuls just to parallel level distribution well, position is bottom oil reservoir, and two mouthfuls of wells keep certain distance, adopts steam injection cyclic preheat technology to carry out preheating.
3. steam according to claim 1-carbon dioxide assisted gravity drainage oil production method, is characterized in that, in step 1, preheating time is 3-4 month.
4. steam according to claim 1-carbon dioxide assisted gravity drainage oil production method, is characterized in that, in step 1, two mouthfuls of water horizontal wells all adopt double tube structure, wherein, the steam injection of long oil pipe, steam injection rate remains on 50-80t/d; Short oil pipe stable bottom hole pressure discharge opeing simultaneously, upper water horizontal well is a little more than lower horizontal well, and pressure reduction is 0.1MPa-0.2MPa.
5. steam according to claim 4-carbon dioxide assisted gravity drainage oil production method, is characterized in that, in step 2, in top horizontal well long oil pipe and short oil pipe, inject well head steam quality is continuously the steam of 90% simultaneously, steam injection rate 100-150t/d.
6. steam according to claim 4-carbon dioxide assisted gravity drainage oil production method, is characterized in that, in step 3, steam is by injecting continuously in upper water horizontal well long oil pipe and short oil pipe simultaneously, and well head steam quality is 90%, steam injection rate 80-120t/d; Carbon dioxide is injected by casing annulus, injection rate 120-180Nm3/h.
7. steam according to claim 1-carbon dioxide assisted gravity drainage oil production method, is characterized in that, in step 2, the steam injection time is 2-3 month.
8. steam according to claim 1-carbon dioxide assisted gravity drainage oil production method, is characterized in that, in step 3, steam and carbon dioxide is injected 20-30d continuously.
9. steam according to claim 1-carbon dioxide assisted gravity drainage oil production method, is characterized in that, in step 4, after stopping carbon dioxide injection, continue steam injection and discharge opeing production 40-60d, working system remains unchanged.
10. steam according to claim 1-carbon dioxide assisted gravity drainage oil production method, it is characterized in that, this steam-carbon dioxide assisted gravity drainage oil production method also comprises, after step 4, repeat step 3 and step 4, recover the oil with assisted gravity drainage.
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Cited By (3)
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| CN105604532A (en) * | 2016-01-26 | 2016-05-25 | 辽宁石油化工大学 | Method for exploiting thick oil reservoir by carbon dioxide method |
| CN108252697A (en) * | 2016-12-29 | 2018-07-06 | 中国石油天然气股份有限公司 | The method for exploiting oil |
| CN110541693A (en) * | 2019-08-29 | 2019-12-06 | 中国石油化工股份有限公司 | CO2 flooding composite development method for low-permeability thick-layer sandstone oil reservoir |
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Cited By (4)
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| CN110541693A (en) * | 2019-08-29 | 2019-12-06 | 中国石油化工股份有限公司 | CO2 flooding composite development method for low-permeability thick-layer sandstone oil reservoir |
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Application publication date: 20151014 |