CN104453805B - A kind of heavy crude reservoir SAGD quick start method - Google Patents
A kind of heavy crude reservoir SAGD quick start method Download PDFInfo
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- CN104453805B CN104453805B CN201410586578.XA CN201410586578A CN104453805B CN 104453805 B CN104453805 B CN 104453805B CN 201410586578 A CN201410586578 A CN 201410586578A CN 104453805 B CN104453805 B CN 104453805B
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
-
- 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
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
-
- 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
- E21B43/2406—Steam assisted gravity drainage [SAGD]
- E21B43/2408—SAGD in combination with other methods
Abstract
The present invention is a kind of heavy crude reservoir SAGD quick start method, and it is comprised the following steps：(1) steam injection well and the high-power electrical heating of producing well；(2) to injecting solvent simultaneously in steam injection well and producing well oil pipe long and short oil pipe；(3) to solvent and steam fluid is injected simultaneously in steam injection well oil pipe long and short oil pipe, to injection solvent in producing well oil pipe long and steam fluid, producing well short oil pipe discharge opeing；(4) closing electrical heating, to pure steam is injected in steam injection well oil pipe long and short oil pipe simultaneously, producing well oil pipe long is with short oil pipe while discharge opeing.The inventive method more than 2/3 time fewer than conventional preheating starting method, so as to substantially increase heat utilization rate, it is capable of achieving SAGD rapidly pre-warmings and starts, accelerates and speed is produced on SAGD.Additionally, being injected with super-broken split pressure by the quick dilatation of solvent, uniform drain path can be set up, realize improving the purpose of yield and recovery ratio.
Description
Technical field
The present invention is the recovery method on the heavy crude reservoir in oil field, more particularly to a kind of heavy crude reservoir steam auxiliary is again
Power draining (SAGD) quick start method.
Background technology
Steam assisted gravity drainage techniques are (referred to as：SAGD it is) that Canada Bulter in 1978 is invented, in Canadian oil
The heavy crude reservoir on the ground such as placer area, the Liaohe Oil Field of China, Xinjiang Oilfield has obtained successful Application.Its principle is in same oil reservoir
Deployment horizontal well pair stacked up and down, injects high-quality steam in the steam injection well of top, and steam is far smaller than crude oil due to density
And onlap forms vapor chamber in the earth formation upwards, with the continuous injection of steam, the continuous upward and sideways expansion of vapor chamber, with oil
There is heat exchange in the crude oil in layer.Heated viscosity of crude reduction, flows downward, from oil reservoir under gravity with condensed water
Produced in the horizontal production well of bottom.
Pertinent literature points out that SAGD exploitations are divided into two stages：SAGD startup stages and SAGD production phases.Opened in SAGD
In the dynamic stage, current SAGD starts generally handle up two methods of pipeline start up by preheating and steam injected cycle preheating startup, wherein, handle up pre-
Thermal starting injection pressure is high, temperature is high, easily completion casing programme is caused damage.It is equal that steam injected cycle preheating starts heating
It is even, start steadily, it is generally divided into three steps：(1) steam is circulated in Liang Koujing, and reservoir mainly transmits heat by heat transfer；
Pressure difference between well is formed between (2) two wells, steam injection well pressure is higher than producing well, crude oil flows toward producing well between making well, to be transferred to
Full SAGD productions are prepared；(3) steamed well annular space in top stops discharge opeing, and bottom producing well stops steam injection, is transferred to completely
The SAGD production phases.
Before SAGD productions are carried out, it is necessary to carry out thermal cycle startup to well.From injecting steam into producing well and steam injection well
Exploit referred to as startup stage in this stage to starting to switch to SAGD, or warm-up phase.The target of warm-up phase is most in short-term
It is interior, the uniform heating of oil reservoir is realized, steam injection well is uniformly heated with producing well and connect, set up between steam injection well and producing well and let out
Oily passage.
Enter one down for conventional steam injected cycle preheating, in steam injection well and production well shaft and stretch into horizontal segment tiptoe
Oil pipe long and a short oil pipe for stretching into horizontal segment heel, steam respectively from top steam injection well and bottom production well shaft in
Oil pipe injection long, then the short oil pipe extraction from top steam injection well and bottom production well shaft respectively.By injection steam and oil
Heat transfer, thermal convection current between layer and the oil reservoir between heat radiation effect heating steam injection well and producing well, reduce viscosity of crude and arrive
Below 150 centipoises, it is allowed to preferable mobility, so that after the SAGD production phases are transferred to, between steam injection well and producing well
Oil reservoir in crude oil energy smooth flow and form drain path so that vapor chamber can constantly extend, crude oil can constantly under let out
It is plucked out of.
But the steam injected cycle preheating method of routine, by the shadow of the thermal physical property parameters such as oil reservoir thermal conductivity, thermal diffusion coefficient
Ring, straight steam cycle preheating firing rate is slow, it usually needs former in oil reservoir between steam injected cycle preheating 150-300 days, injection-production well
Oil viscosity can be only achieved below 150 centipoises.Because steam that circulation preheating requirement discharge from short oil pipe has at least 10% to do
Degree, therefore it is required that the well head steam quality of injection steam is higher, usually above 80%, particularly with deeper oil reservoir is buried, then along journey
Steam quality heat loss is bigger, and well head steam quality generally needs to reach 100%.Therefore, will consume big in loop preheat phase
The steam of amount and substantial amounts of heat energy, cause SAGD preheating times long, and initial stage cost of winning remains high, and upper product speed is slow.
Thus, the present inventor relies on the experience and practice for being engaged in relevant industries for many years, proposes that a kind of heavy crude reservoir steam is auxiliary
Gravity drainage quick start method is helped, to overcome the defect of prior art.
The content of the invention
It is an object of the invention to provide a kind of heavy crude reservoir SAGD quick start method, to realize drop
Low energy consumption, quick startup.
The object of the present invention is achieved like this, a kind of heavy crude reservoir SAGD quick start method, should
Method is at least comprised the following steps：
(1) steam injection well and producing well electrical heating；
(2) to injecting solvent simultaneously in steam injection well and producing well oil pipe long and short oil pipe；
(3) to the fluid-mixing for injecting solvent and steam in steam injection well oil pipe long and short oil pipe simultaneously, to producing well long oil
The fluid-mixing of injection solvent and steam, producing well short oil pipe discharge opeing in pipe；
(4) electrical heating is closed, to injecting pure steam, producing well oil pipe long and short in steam injection well oil pipe long and short oil pipe simultaneously
Oil pipe discharge opeing simultaneously.
In a better embodiment of the invention, before step (1) implementation, enter down in steam injection well and production well shaft
A piece oil pipe long for stretching to horizontal segment tiptoe, one stretches to horizontal segment heel and the short oil pipe being parallel to each other with oil pipe long,
A piece electric heating tube, and an electric thermo-couple temperature monitoring pipe.
In a better embodiment of the invention, in step (1), using resistance heating, every meter of horizontal section length
Maximum resistance power is 1000-2000KW, and maximum temperature is the corresponding saturated-steam temperature of the formation pressure, by ground spirit
Regulation control power living, so as to control maximum heating temperature.
In a better embodiment of the invention, in step (1), using electromagnetism, heating using microwave.
In a better embodiment of the invention, the heat time in step (1) is 5-10 days.
In a better embodiment of the invention, in step (2), type of solvent is that carbon number is molten from the alkane of 5-20
Agent, solvent temperature is the saturated-steam temperature under the formation pressure.
In a better embodiment of the invention, in step (2), selected solvent is in formation pressure and the pressure
Under corresponding saturated-steam temperature, under same solvent molar fraction, to reducing crude oil viscosity amplitude highest solvent or dicyandiamide solution.
In a better embodiment of the invention, in step (2), the total injection rate of individual well solvent is 100-500
Ton day, oil pipe long is 1 with short oil pipe injection rate：1, injection pressure highest exceedes oil breakdown pressure 0.3-0.5MPa, note
The angle of incidence is 1-3 days.
In a better embodiment of the invention, in step (3), the total injection rate 100-200 ton days of steam injection well,
Oil pipe long is 1 with short oil pipe implantation quality speed proportional：1, producing well oil pipe injection rate long is 100 ton days, producing well short oil
Pipe discharge opeing, short oil pipe drain age velocity is 100-200 ton days.
In a better embodiment of the invention, in step (3), the matter of solvent and steam in the fluid-mixing
Amount declines step by step than being three-level with injection length；Specifically, at first 5-10 days, solvent and quality of steam ratio are 2：1；
Middle 5-10 days, solvent and quality of steam ratio were 1：1；At last 5-10 days, solvent and quality of steam ratio were 1：2；Should
Step Time is 15-30 days；
In a better embodiment of the invention, in step (3), steam injection well injects pressure and ruptures pressure from higher than oil reservoir
Power 0.3-0.5MPa is linearly gradually decreased to higher than initial reservoir pressure 0.3-0.5MPa；Lines of producing wells hydraulic coupling is broken from oil reservoir
Split pressure linearly gradually decreases to initial reservoir pressure；Pressure difference remains 0.3-0.5MPa between injection-production well.
In a better embodiment of the invention, in step (4), for the shaft bottom that the SAGD production phases inject steam
When mass dryness fraction is less than 50%, electrical heating in steam injection well is opened in good time, In Situ Heating simultaneously improves steam quality.
From the above mentioned, heavy crude reservoir SAGD quick start method of the invention, first using underground electricity
Resistance/electromagnetism/heating using microwave, 1 meter or so oil reservoir of rapidly pre-warming near wellbore, then steam injection well is molten with producing well simultaneous implantation liquid
Quick dilatation and the fast instant oil of solvent are realized in agent, reduce near wellbore viscosity of crude, are then injected solvent and are steamed with certain proportion
The fluid-mixing of vapour, and solvent and steam rates are gradually adjusted, drain path quickly is set up between injection-production well, last steam injection well is complete
Complete to be changed to steam injection, producing well is changed to production completely, so as to be transferred to the SAGD production phases.
Heavy crude reservoir SAGD quick start method of the invention, with following technique effect：
(1) SAGD provided by the present invention starts method, makes 1 meter or so of near wellbore using high-power electric heater first
It is rapidly heated in the range of oil reservoir to saturated-steam temperature, this process only needs 5-10 days；And the steam injected cycle preheating of routine
Oil reservoir needs 30-50 days in the range of 1 meter of near wellbore of heating；
(2) after near wellbore intensification, injected simultaneously at a high speed higher than oil breakdown pressure in steam injection well and producing well
Hot solvent, because near wellbore temperature is higher, solvent rapidly enters near wellbore oil reservoir, further molten oily viscosity reduction, and leads to
The microcrack for crossing super-broken split pressure generation enters oil reservoir middle part between steam injection well and producing well, increases molten oily viscosity reduction scope, sets up
Pressure communication between steam injection well and producing well；
(3) solvent persistently injects solvent and steam between crack breakthrough steam injection well and producing well after oil reservoir to steam injection well
Compound fluid (fluid-mixing), and producing well is adopted using circulation note, the discharge opeing pressure of injection pressure and the producing well of steam injection well by
Level is synchronous to be declined, and pressure difference keeps constant, is conducive to producing well stabilization well cylinder pressure, it is ensured that the fluid of steam injection well injection is along water
Flat section realizes the uniform foundation of drain path even into producing well, prevents single-point from breaking through；Simultaneously as steam is to steam injection well
Mud stone/sand shale interlayer or less permeable layer between producing well have preferable corrosion, therefore, steam ratio is increased step by step
Example, the low permeable sublayer section between erodable steam injection well and producing well horizontal segment, improves overall draining ability uniform with draining
Property.And the presence of solvent can further speed up viscosity reduction, viscosity of crude in oil reservoir is realized between steam injection well and producing well horizontal segment
Rapidly drop to the purpose of 150 centipoises；
(4) compared with conventional SAGD circulation preheating starting methods, the above method proposed by the present invention, overall preheating time is only
21-43 days are needed, fewer than conventional preheating starting method more than 2/3 time, so as to substantially increase heat utilization rate, can be real
Existing SAGD rapidly pre-warmings start, and accelerate and speed is produced on SAGD；Additionally, injected with super-broken split pressure by the quick dilatation of solvent,
Uniform drain path can be set up, realizes improving the purpose of yield and recovery ratio.
Brief description of the drawings
The following drawings is only intended to, in schematic illustration and explanation is done to the present invention, not delimit the scope of the invention.
Wherein：
Fig. 1：It is the schematic flow sheet of heavy crude reservoir SAGD (SAGD) quick start method of the present invention.
Specific embodiment
In order to be more clearly understood to technical characteristic of the invention, purpose and effect, now control illustrates this hair
Bright specific embodiment.
As shown in figure 1, the present invention proposes a kind of heavy crude reservoir SAGD quick start method, use first
Downhole electric heating, rapidly pre-warming near wellbore oil reservoir, then steam injection well is quick with the realization of producing well simultaneous implantation liquid solvent expands
Hold and the fluid-mixing of solvent and steam then injected with certain proportion with the fast instant oil of solvent, reduction near wellbore viscosity of crude,
And solvent and steam rates are gradually adjusted, and drain path quickly is set up between injection-production well, last steam injection well is changed to steam injection completely,
Producing well is changed to production completely, so as to be transferred to the SAGD production phases；
Specifically, the method is at least comprised the following steps：
(1) steam injection well and producing well electrical heating；
(2) to injecting solvent simultaneously in steam injection well and producing well oil pipe long and short oil pipe；
(3) to the fluid-mixing for injecting solvent and steam in steam injection well oil pipe long and short oil pipe simultaneously, to producing well long oil
The fluid-mixing of injection solvent and steam, producing well short oil pipe discharge opeing in pipe；
(4) electrical heating is closed, to injecting pure steam, producing well oil pipe long and short in steam injection well oil pipe long and short oil pipe simultaneously
Oil pipe discharge opeing simultaneously.
Heavy crude reservoir SAGD quick start method of the invention than conventional preheating starting method fewer 2/3
The above time, so as to substantially increase heat utilization rate, it is capable of achieving SAGD rapidly pre-warmings and starts, accelerates and speed is produced on SAGD；
Additionally, being injected with super-broken split pressure by the quick dilatation of solvent, uniform drain path can be set up, it is possible to increase yield and harvesting
Rate.
Embodiment one
The present embodiment provides a kind of heavy crude reservoir SAGD quick start methods, first in SAGD steam injections well and production well shaft
Inside enter an oil pipe long for stretching to horizontal segment tiptoe down, one stretches to horizontal segment heel and is parallel to each other with oil pipe long
Short oil pipe, an electric heating tube, and an electric thermo-couple temperature monitoring pipe.
The heavy crude reservoir SAGD quick start methods include step in detail below：
(1) high-power electrical heating is carried out to steam injection well and producing well, using resistance heating, maximum resistance power is
1000KW/ unit levels segment length (m), maximum temperature is the corresponding saturated-steam temperature of the formation pressure, flexible by ground
Regulation control power, so as to control maximum heating temperature, the heat time is 10 days.
(2) to injecting solvent in steam injection well and producing well oil pipe long and short oil pipe simultaneously, type of solvent is alkane that carbon number is 5
Hydrocarbon solvent, solvent temperature is the saturated-steam temperature under the formation pressure, is shown by high temperature viscosity test result, selected solvent
It is that under same solvent molar fraction, the solvent is to the original under formation pressure and the corresponding saturated-steam temperature of the pressure
Oily viscosity reduction amplitude highest；The total injection rate of individual well solvent is 100 ton days, and oil pipe long is 1 with short oil pipe injection rate：1, injection
Pressure highest exceedes oil breakdown pressure 0.3MPa, and injection length is 3 days.
(3) to the fluid-mixing for injecting solvent and steam in steam injection well oil pipe long and short oil pipe simultaneously, individual well always injects speed
200 ton days are spent, oil pipe long and short oil pipe injection ratio are 1：1；To the mixed flow that solvent and steam are injected in producing well oil pipe long
Body, injection rate is 100 ton days, and producing well short oil pipe discharge opeing, drain age velocity is 200 ton days.The mass ratio of solvent and steam
Decline for three-level and step by step；The Step Time is 15 days, and specifically, at first 5 days, solvent was 2 with the mass ratio of steam：1；
Middle 5 days, solvent is 1 with the mass ratio of steam：1；At last 5 days, solvent was 1 with the mass ratio of steam：2；Steam injection well
Injection pressure is gradually decreased to higher than initial reservoir pressure 0.3MPa from higher than oil breakdown pressure 0.3MPa；Lines of producing wells hydraulic pressure
Power gradually decreases to initial reservoir pressure from oil breakdown pressure；Pressure difference remains 0.3MPa between injection-production well.
(4) electrical heating is closed, to injecting pure steam, producing well oil pipe long and short in steam injection well oil pipe long and short oil pipe simultaneously
Oil pipe discharge opeing simultaneously, into the SAGD production phases.
Compared with adjacent S AGD wells using conventional steam injected cycle preheating to starting method, the present embodiment totality preheating time
Only need to 28 days, fewer than conventional preheating starting method more than 2/3 time (conventional method：150 days), so as to substantially increase heat
Energy utilization rate, is capable of achieving SAGD rapidly pre-warmings and starts, and accelerates and speed is produced on SAGD；Additionally, passing through the quick dilatation of solvent and surpassing
Fracture pressure is injected, and can set up uniform drain path, realizes improving the purpose of yield and recovery ratio.
Embodiment two
The well pattern structure of the present embodiment is identical with embodiment one, and its difference is step in detail below：
(1) high-power electrical heating is carried out to steam injection well and producing well, using resistance heating, maximum resistance power is
1500KW/ unit levels segment length (m), maximum temperature is the corresponding saturated-steam temperature of the formation pressure, flexible by ground
Regulation control power, so as to control maximum heating temperature, the heat time is 7 days.
(2) to solvent is injected in steam injection well and producing well oil pipe long and short oil pipe simultaneously, type of solvent is the alkane of carbon number 10
Hydrocarbon solvent, solvent temperature is the saturated-steam temperature under the formation pressure, is shown by high temperature viscosity test result, selected solvent
It is that under same solvent molar fraction, the solvent is to the original under formation pressure and the corresponding saturated-steam temperature of the pressure
Oily viscosity reduction amplitude highest；The total injection rate of individual well solvent is 300 ton days, and oil pipe long is 1 with short oil pipe injection rate：1, injection
Pressure highest exceedes oil breakdown pressure 0.4MPa, and injection length is 2 days.
(3) to the fluid-mixing for injecting solvent and steam in steam injection well oil pipe long and short oil pipe simultaneously, individual well always injects speed
150 ton days are spent, oil pipe long and short oil pipe injection ratio are 1：1；To the mixed flow that solvent and steam are injected in producing well oil pipe long
Body, injection rate is 100 ton days, and producing well short oil pipe discharge opeing, drain age velocity is 150 ton days.The mass ratio of solvent and steam
Decline for three-level and step by step；The Step Time is 21 days, and specifically, at first 7 days, solvent was 2 with the mass ratio of steam：1；
Middle 7 days, solvent is 1 with the mass ratio of steam：1；At last 7 days, solvent was 1 with the mass ratio of steam：2；Steam injection well
Injection pressure is gradually decreased to higher than initial reservoir pressure 0.4MPa from higher than oil breakdown pressure 0.4MPa；Lines of producing wells hydraulic pressure
Power gradually decreases to initial reservoir pressure from oil breakdown pressure；Pressure difference remains 0.4MPa between injection-production well.
(4) electrical heating is closed, to injecting pure steam, producing well oil pipe long and short in steam injection well oil pipe long and short oil pipe simultaneously
Oil pipe discharge opeing simultaneously, into the SAGD production phases.
Compared with adjacent S AGD wells using conventional steam injected cycle preheating to starting method, the present embodiment totality preheating time
Only need to 30 days, fewer than conventional preheating starting method more than 2/3 time (conventional method 150 days), so as to substantially increase heat
Energy utilization rate, is capable of achieving SAGD rapidly pre-warmings and starts, and accelerates and speed is produced on SAGD；Additionally, passing through the quick dilatation of solvent and surpassing
Fracture pressure is injected, and can set up uniform drain path, realizes improving the purpose of yield and recovery ratio.
Embodiment three
The well pattern structure of the present embodiment is identical with embodiment one, and its difference is step in detail below：
(1) high-power electrical heating is carried out to steam injection well and producing well, using resistance heating, maximum resistance power is
2000KW/ unit levels segment length (m), maximum temperature is the corresponding saturated-steam temperature of the formation pressure, flexible by ground
Regulation control power, so as to control maximum heating temperature, the heat time is 5 days.
(2) to solvent is injected in steam injection well and producing well oil pipe long and short oil pipe simultaneously, type of solvent is the alkane of carbon number 20
Hydrocarbon solvent, solvent temperature is the saturated-steam temperature under the formation pressure, is shown by high temperature viscosity test result, selected solvent
It is that under same solvent molar fraction, the solvent is to the original under formation pressure and the corresponding saturated-steam temperature of the pressure
Oily viscosity reduction amplitude highest；The total injection rate of individual well solvent is 500 ton days, and oil pipe long is 1 with short oil pipe injection rate：1, injection
Pressure highest exceedes oil breakdown pressure 0.5MPa, and injection length is 1 day.
(3) to the fluid-mixing for injecting solvent and steam in steam injection well oil pipe long and short oil pipe simultaneously, individual well always injects speed
100 ton days are spent, oil pipe long and short oil pipe injection ratio are 1：1；To the mixed flow that solvent and steam are injected in producing well oil pipe long
Body, injection rate is 100 ton days, and producing well short oil pipe discharge opeing, drain age velocity is 100 ton days.The mass ratio of solvent and steam
Decline for three-level and step by step；The Step Time is 30 days, and specifically, at first 10 days, solvent was 2 with the mass ratio of steam：1；
At middle 10 days, solvent was 1 with the mass ratio of steam：1；At last 10 days, solvent was 1 with the mass ratio of steam：2；Note
Vapour well injects pressure and is gradually decreased to higher than initial reservoir pressure 0.5MPa from higher than oil breakdown pressure 0.5MPa；Lines of producing wells
Hydraulic coupling gradually decreases to initial reservoir pressure from oil breakdown pressure；Pressure difference remains 0.5MPa between injection-production well.
(4) electrical heating is closed, to injecting pure steam, producing well oil pipe long and short in steam injection well oil pipe long and short oil pipe simultaneously
Oil pipe discharge opeing simultaneously, into the SAGD production phases.
Compared with adjacent S AGD wells using conventional steam injected cycle preheating to starting method, the present embodiment totality preheating time
Only need to 36 days, fewer than conventional preheating starting method more than 2/3 time (conventional method 150 days), so as to substantially increase heat
Energy utilization rate, is capable of achieving SAGD rapidly pre-warmings and starts, and accelerates and speed is produced on SAGD；Additionally, passing through the quick dilatation of solvent and surpassing
Fracture pressure is injected, and can set up uniform drain path, realizes improving the purpose of yield and recovery ratio.
Schematical specific embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any
Those skilled in the art, done equivalent variations and modification on the premise of design of the invention and principle is not departed from,
The scope of protection of the invention should be belonged to.
Claims (10)
1. a kind of heavy crude reservoir SAGD quick start method, the method is at least comprised the following steps：
(1) steam injection well and producing well electrical heating, maximum temperature is the corresponding saturated-steam temperature of the formation pressure；
(2) to injecting solvent simultaneously in steam injection well and producing well oil pipe long and short oil pipe；Type of solvent is alkane of the carbon number from 5-20
Hydrocarbon solvent, solvent temperature is the saturated-steam temperature under the formation pressure；The total injection rate of individual well solvent be 100-500 tons/
My god；Injection pressure highest exceedes oil breakdown pressure 0.3-0.5MPa；
(3) to the fluid-mixing for injecting solvent and steam in steam injection well oil pipe long and short oil pipe simultaneously, in producing well oil pipe long
The fluid-mixing of injection solvent and steam, producing well short oil pipe discharge opeing；The mass ratio of solvent and steam in the fluid-mixing
It is three-level, and declines step by step with injection length；Specifically, at first 5-10 days, solvent and quality of steam ratio are 2：1；In centre
5-10 days, solvent and quality of steam ratio were 1：1；At last 5-10 days, solvent and quality of steam ratio were 1：2；The step
Time is 15-30 days；Steam injection well inject pressure from higher than oil breakdown pressure 0.3-0.5MPa it is linear gradually decrease to be higher than
Initial reservoir pressure 0.3-0.5MPa；
(4) electrical heating is closed, to injecting pure steam, producing well oil pipe long and short oil pipe in steam injection well oil pipe long and short oil pipe simultaneously
Discharge opeing simultaneously.
2. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：In step
(1) before implementing, an oil pipe long for stretching to horizontal segment tiptoe is entered down in steam injection well and production well shaft, one stretches to water
Flat section heel and the short oil pipe being parallel to each other with oil pipe long, an electric heating tube, and an electric thermo-couple temperature monitoring pipe.
3. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：In step
(1) in, using resistance heating, every meter of maximum resistance power of horizontal section length is 1000-2000KW, is flexibly adjusted by ground
Section control power, so as to control maximum heating temperature.
4. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：In step
(1) in, using electromagnetism or heating using microwave.
5. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：Step
(1) heat time in is 5-10 days.
6. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：In step
(2) in, selected solvent is under formation pressure and the corresponding saturated-steam temperature of the pressure, in same solvent molar fraction
Under, to reducing crude oil viscosity amplitude highest solvent.
7. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：In step
(2) in, oil pipe long is 1 with short oil pipe injection rate：1, injection length is 1-3 days.
8. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：In step
(3) in, the total injection rate 100-200 ton days of steam injection well, oil pipe long is 1 with short oil pipe implantation quality speed proportional：1, production
Well oil pipe injection rate long is 100 ton days, and producing well short oil pipe discharge opeing, short oil pipe drain age velocity is 100-200 ton days.
9. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：In step
(3) in, lines of producing wells hydraulic coupling linearly gradually decreases to initial reservoir pressure from oil breakdown pressure；Pressure difference is all the time between injection-production well
Remain 0.3-0.5MPa.
10. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterised in that：In step
Suddenly in (4), when being less than 50% for the shaft bottom mass dryness fraction that the SAGD production phases inject steam, electrical heating in steam injection well is opened in good time,
In Situ Heating simultaneously improves steam quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410586578.XA CN104453805B (en) | 2014-10-28 | 2014-10-28 | A kind of heavy crude reservoir SAGD quick start method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410586578.XA CN104453805B (en) | 2014-10-28 | 2014-10-28 | A kind of heavy crude reservoir SAGD quick start method |
Publications (2)
| Publication Number | Publication Date |
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| CN104453805A CN104453805A (en) | 2015-03-25 |
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| CN104832141B (en) * | 2015-04-13 | 2018-02-02 | 中国石油天然气股份有限公司 | A kind of solvent subsidiary level interwell communication method |
| CN105178931B (en) * | 2015-09-06 | 2017-11-07 | 中国石油天然气股份有限公司 | A kind of method that speed is produced on raising SAGD initial stages |
| CN106593367B (en) * | 2015-10-14 | 2019-04-09 | 中国石油天然气股份有限公司 | The starting method of heavy crude reservoir steam assisted gravity drainage |
| CN106917616B (en) * | 2015-12-28 | 2019-11-08 | 中国石油天然气股份有限公司 | The preheating device and method of heavy crude reservoir |
| CN109630080A (en) * | 2017-10-09 | 2019-04-16 | 中国石油天然气股份有限公司 | The recovery method of super-heavy oil deposit steam assisted gravity drainage producing initial stage |
| CN108131124A (en) * | 2017-11-13 | 2018-06-08 | 中国石油天然气股份有限公司 | A kind of method using solvent and superheated steam assisted gravity drainage |
| CN110318722B (en) * | 2018-03-30 | 2022-04-12 | 中国石油化工股份有限公司 | System and method for extracting oil gas by heating stratum |
| CN109138976B (en) * | 2018-07-23 | 2022-01-04 | 中国石油天然气股份有限公司 | Method for judging time for converting double-horizontal-well preheating into SAGD (steam assisted gravity drainage) and double-horizontal-well preheating device |
| CN110029975A (en) * | 2019-03-21 | 2019-07-19 | 新疆中凌工程技术有限公司 | Mudstone foundation structure and construction method above the horizontal well group steam injection of SAGD are broken up using straight well |
| CN110242266B (en) * | 2019-07-08 | 2021-07-16 | 新疆中凌工程技术有限公司 | Temporary plugging segmented expansion reservoir reconstruction method for SAGD horizontal well group |
| CN112412409A (en) * | 2019-08-20 | 2021-02-26 | 中国石油天然气股份有限公司 | Double-horizontal-well SAGD electric preheating starting method |
| CN113250665B (en) * | 2020-02-11 | 2022-06-03 | 中国石油天然气股份有限公司 | Underground preheating starting method for super heavy oil reservoir developed by double-horizontal-well SAGD |
| CN114439440A (en) * | 2020-11-03 | 2022-05-06 | 中国石油化工股份有限公司 | Viscosity reduction pressure flooding method for deep low-permeability heavy oil reservoir |
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| CN103615224B (en) * | 2013-11-08 | 2016-02-10 | 中国石油天然气股份有限公司 | Solvent improves method and the well pattern structure of exploiting thickened oil through steam assisted gravity drainage Tibetan |
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