CN104453805A - Rapid start method for heavy oil reservoir steam assisted gravity drainage - Google Patents
Rapid start method for heavy oil reservoir steam assisted gravity drainage Download PDFInfo
- Publication number
- CN104453805A CN104453805A CN201410586578.XA CN201410586578A CN104453805A CN 104453805 A CN104453805 A CN 104453805A CN 201410586578 A CN201410586578 A CN 201410586578A CN 104453805 A CN104453805 A CN 104453805A
- Authority
- CN
- China
- Prior art keywords
- oil pipe
- steam
- solvent
- well
- sagd
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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 invention discloses a rapid start method for heavy oil reservoir steam assisted gravity drainage. The rapid start method for heavy oil reservoir steam assisted gravity drainage comprises the following steps that (1) a steam injection well and a producing well are electrically heated at a large power; (2) a solvent is injected into a long oil pipe and a short oil pipe of the steam injection well and a long oil pipe and a short oil pipe of the producing well at the same time; (3) a solvent and steam liquid mixture is injected into the long oil pipe and the short oil pipe of the steam injection well at the same time, the solvent and steam liquid mixture is injected into the long oil pipe of the producing well, and the short oil pipe of the producing well discharges liquid; (4) electric heating is stopped, pure steam is injected into the long oil pipe of the steam injection well and the short oil pipe of the seam injection well at the same time, and the long oil pipe and the short oil pipe of the producing well discharge liquid at the same time. Compared with a conventional preheating start method, time is shortened by over two thirds, so that the heat energy utilization rate is greatly increased, rapid preheating start of SAGD can be achieved, and the production speed of SAGD is increased. In addition, through rapid solvent volume expansion and super fracture pressure injection, an even oil drainage channel can be established, and the purposes of increasing the yield and the recovery rate are achieved.
Description
Technical field
The invention relates to the exploitation method of the heavy crude reservoir in oil field, particularly relate to a kind of heavy crude reservoir SAGD (SAGD) quick start method.
Background technology
Steam assisted gravity drainage techniques (is called for short: be SAGD) that Canadian Bulter in 1978 invented, obtain successful Application at the heavy crude reservoir on the ground such as Liaohe Oil Field, Xinjiang Oilfield of Canadian oil-sand mining area, China.Its principle disposes horizontal well pair stacked up and down at same oil reservoir, high-quality steam is injected in the steam injection well of top, steam is far smaller than crude oil and upwards onlap forms vapor chamber in the earth formation due to density, along with the continuous injection of steam, vapor chamber constantly upwards and sideways expansion, with the crude oil generation interchange of heat in oil reservoir.Reduced by the viscosity of crude heated, flow downward under gravity with condensed water, extraction from the horizontal production well of oil reservoir bottom.
Pertinent literature is pointed out, SAGD exploitation is divided into two stages: the startup stage of SAGD and the SAGD production phase.SAGD startup stage, current SAGD starts handle up pipeline start up by preheating and steam injected cycle pipeline start up by preheating two kinds of methods usually, wherein, handles up that pipeline start up by preheating injection pressure is high, temperature is high, easily causes damage to completion interval of well body structure.Steam injected cycle pipeline start up by preheating homogeneous heating, starts steadily, is generally divided into three steps: (1) steam circulates in Liang Koujing, and reservoir carrys out transferring heat mainly through heat transfer; Form pressure reduction between well between (2) two wells, steam injection well pressure, higher than producing well, makes crude oil between well flow toward producing well, prepares for proceeding to SAGD production completely; (3) steamed well annular space in top stops discharge opeing, and bottom producing well stops steam injection, proceeds to the SAGD production phase completely.
Before carrying out SAGD production, thermal cycle startup must be carried out to well.From by steam injection producing well and steam injection well to transfer SAGD to and exploit this stage and be called startup stage or warm-up phase.The target of warm-up phase is within the shortest time, realizes the homogeneous heating of oil reservoir, steam injection well is communicated with producing well homogeneous heating, sets up drain path between steam injection well and producing well.
For the steam injected cycle preheating of routine, the short oil pipe that a long oil Guan Yuyi root stretching into horizontal segment tiptoe stretches into horizontal segment heel is entered all down in steam injection well and producing well pit shaft, steam injects from the long oil pipe in top steam injection well and bottom producing well pit shaft respectively, more respectively from the short oil pipe extraction in top steam injection well and bottom producing well pit shaft.The oil reservoir between steam injection well and producing well is heated in heat transfer between dependence injection steam and oil reservoir, thermal convection current and heat radiation effect, reduce below viscosity of crude to 150 centipoises, make it that there is good mobility, thus after proceeding to the SAGD production phase, crude oil energy smooth flow in oil reservoir between steam injection well and producing well also forms drain path, vapor chamber can constantly be expanded, crude oil can constantly under let out and be plucked out of.
But the steam injected cycle pre-heating mean of routine, be subject to the impact of the thermal physical property parameters such as oil reservoir thermal conductivity, thermal diffusion coefficient, straight steam cycle preheating firing rate is slow, and usually need steam injected cycle preheating 150-300 days, between injection-production well, in oil reservoir, viscosity of crude just can reach below 150 centipoises.Because cyclic preheat requires that the steam of discharging from short oil pipe has the mass dryness fraction of at least 10%, therefore require that the well head steam quality injecting steam is higher, usually above 80%, especially for burying darker oil reservoir, then larger along journey steam quality heat waste, well head steam quality needs to reach 100% usually.Therefore, in the cyclic preheat stage by a large amount of steam of consumption and a large amount of heat energy, cause SAGD long for preheating time, initial stage cost of winning remains high, and upper product speed is slow.
Thus, the present inventor relies on experience and the practice of being engaged in relevant industries for many years, proposes a kind of heavy crude reservoir SAGD quick start method, to overcome the defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of heavy crude reservoir SAGD quick start method, to realize reducing energy consumption, starting fast.
The object of the present invention is achieved like this, a kind of heavy crude reservoir SAGD quick start method, and the method at least comprises the following steps:
(1) steam injection well and producing well electrical heating;
(2) in steam injection well and producing well long oil pipe and short oil pipe, inject solvent simultaneously;
(3) in steam injection well long oil pipe and short oil pipe, inject the fluid-mixing of solvent and steam simultaneously, in producing well long oil pipe, inject the fluid-mixing of solvent and steam, the discharge opeing of producing well short oil pipe;
(4) close electrical heating, in steam injection well long oil pipe and short oil pipe, inject pure steam simultaneously, producing well long oil pipe and the discharge opeing simultaneously of short oil pipe.
In a better embodiment of the present invention, before step (1) is implemented, the long oil pipe that one stretches to horizontal segment tiptoe is entered all down in steam injection well and producing well pit shaft, one stretches to horizontal segment heel and the short oil pipe be parallel to each other with long oil pipe, an electric heating tube, and an electric thermo-couple temperature monitoring pipe.
In a better embodiment of the present invention, in step (1), adopt resistance heated, the maximum resistance power of every meter of horizontal section length is 1000-2000KW, maximum temperature is saturated-steam temperature corresponding to this formation pressure, control power by ground flexible modulation, thus control maximum heating temperature.
In a better embodiment of the present invention, in step (1), adopt electromagnetism, heating using microwave.
In a better embodiment of the present invention, the heat time in step (1) is 5-10 days.
In a better embodiment of the present invention, in step (2), type of solvent is the alkane solvent of carbon number from 5-20, and solvent temperature is the saturated-steam temperature under this formation pressure.
In a better embodiment of the present invention, in step (2), selected solvent is under formation pressure and saturated-steam temperature corresponding to this pressure, under same solvent molar fraction, and the solvent the highest to reducing crude oil viscosity amplitude or dicyandiamide solution.
In a better embodiment of the present invention, in step (2), the total injection rate of individual well solvent is 100-500 ton/sky, and long oil pipe and short oil pipe injection rate are 1:1, injection pressure is the highest exceedes oil reservoir fracture pressure 0.3-0.5MPa, and injection length is 1-3 days.
In a better embodiment of the present invention, in step (3), the total injection rate 100-200 ton/sky of steam injection well, long oil pipe and short oil pipe implantation quality speed proportional are 1:1, producing well long oil pipe injection rate is 100 tons/day, the discharge opeing of producing well short oil pipe, short oil pipe drain age velocity is 100-200 ton/sky.
In a better embodiment of the present invention, in step (3), the solvent in described fluid-mixing and the mass ratio of steam are three grades, and decline step by step with injection length; Particularly, at front 5-10 days, solvent and quality of steam ratio are 2:1; At middle 5-10 days, solvent and quality of steam ratio are 1:1; In the end 5-10 days, solvent and quality of steam ratio are 1:2; This step time is 15-30 days;
In a better embodiment of the present invention, in step (3), steam injection well injection pressure linearly drops to higher than initial reservoir pressure 0.3-0.5MPa gradually from higher than oil reservoir fracture pressure 0.3-0.5MPa; Lines of producing wells hydraulic coupling linearly drops to initial reservoir pressure gradually from oil reservoir fracture pressure; Between injection-production well, pressure reduction remains 0.3-0.5MPa.
In a better embodiment of the present invention, in step (4), when the shaft bottom mass dryness fraction injecting steam for the SAGD production phase is less than 50%, open electrical heating in steam injection well, In Situ Heating also improves steam quality in good time.
From the above mentioned, heavy crude reservoir SAGD quick start method of the present invention, first down-hole resistance/electromagnetism/heating using microwave is adopted, rapidly pre-warming near wellbore about 1 meter oil reservoir, then steam injection well and producing well simultaneous implantation liquid solvent realize quick dilatation and the fast instant oil of solvent, reduce near wellbore viscosity of crude, then the fluid-mixing of solvent and steam is injected with certain proportion, and adjust solvent and steam rates gradually, drain path is set up fast between injection-production well, last steam injection well changes steam injection into completely, producing well changes production into completely, thus proceed to the SAGD production phase.
Heavy crude reservoir SAGD quick start method of the present invention, has following technique effect:
(1) SAGD starting method provided by the present invention, first adopt large power, electrically heater to make to be rapidly heated within the scope of near wellbore about 1 meter oil reservoir saturated-steam temperature, this process only needs 5-10 days; And oil reservoir needs 30-50 days within the scope of the steam injected cycle preheating heating near wellbore 1 meter of routine;
(2) after near wellbore heats up, inject hot solvent at a high speed higher than oil reservoir fracture pressure in steam injection well and producing well simultaneously, because near wellbore temperature is higher, solvent enters near wellbore oil reservoir fast, further molten oily viscosity reduction, and to enter between steam injection well and producing well in the middle part of oil reservoir by the microcrack that super fracture pressure produces, strengthen molten oily viscosity reduction scope, set up the pressure communication between steam injection well and producing well;
(3) solvent is after oil reservoir between crack breakthrough steam injection well and producing well, continue to inject solvent and compound steam fluid (fluid-mixing) to steam injection well, and producing well adopts circulation note to adopt, the injection pressure of steam injection well and the discharge opeing pressure of producing well synchronously decline step by step, pressure reduction keeps constant, is conducive to producing well and stablizes well cylinder pressure, ensures that the fluid that steam injection well injects evenly enters producing well along horizontal segment, realize the even foundation of drain path, prevent single-point from breaking through; Simultaneously, because steam has good corrosion to the mud stone between steam injection well and producing well/sand shale interlayer or less permeable layer, therefore, increase steam rates step by step, low permeable sublayer section between erodable steam injection well and producing well horizontal segment, improves the uniformity of overall draining ability and draining.And the existence of solvent can accelerate viscosity reduction further, to realize between steam injection well and producing well horizontal segment viscosity of crude in oil reservoir and rapidly drop to the object of 150 centipoises;
(4) compared with conventional SAGD cyclic preheat starting method, the said method that the present invention proposes, overall preheating time only needs 21-43 days, fewer than conventional preheating starting method more than 2/3 time, thus substantially increase heat utilization rate, SAGD rapidly pre-warming can be realized start, accelerate product speed on SAGD; In addition, injected by the quick dilatation of solvent and super fracture pressure, even drain path can be set up, realize the object improving output and recovery ratio.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.
Wherein:
Fig. 1: be the schematic flow sheet of heavy crude reservoir SAGD (SAGD) quick start method of the present invention.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
As shown in Figure 1, the present invention proposes a kind of heavy crude reservoir SAGD quick start method, first downhole electric heating is adopted, rapidly pre-warming near wellbore oil reservoir, then steam injection well and producing well simultaneous implantation liquid solvent realize quick dilatation and the fast instant oil of solvent, reduce near wellbore viscosity of crude, then the fluid-mixing of solvent and steam is injected with certain proportion, and adjust solvent and steam rates gradually, drain path is set up fast between injection-production well, last steam injection well changes steam injection into completely, producing well changes production into completely, thus proceed to the SAGD production phase,
Particularly, the method at least comprises the following steps:
(1) steam injection well and producing well electrical heating;
(2) in steam injection well and producing well long oil pipe and short oil pipe, inject solvent simultaneously;
(3) in steam injection well long oil pipe and short oil pipe, inject the fluid-mixing of solvent and steam simultaneously, in producing well long oil pipe, inject the fluid-mixing of solvent and steam, the discharge opeing of producing well short oil pipe;
(4) close electrical heating, in steam injection well long oil pipe and short oil pipe, inject pure steam simultaneously, producing well long oil pipe and the discharge opeing simultaneously of short oil pipe.
Heavy crude reservoir SAGD quick start method of the present invention was fewer than conventional preheating starting method more than 2/3 time, thus substantially increased heat utilization rate, can realize SAGD rapidly pre-warming and start, accelerate product speed on SAGD; In addition, injected by the quick dilatation of solvent and super fracture pressure, even drain path can be set up, output and recovery ratio can be improved.
Embodiment one
The present embodiment provides a kind of heavy crude reservoir SAGD quick start method, first in SAGD steam injection well and producing well pit shaft, the long oil pipe that one stretches to horizontal segment tiptoe is entered all down, one stretches to horizontal segment heel and the short oil pipe be parallel to each other with long oil pipe, an electric heating tube, and an electric thermo-couple temperature monitoring pipe.
Described heavy crude reservoir SAGD quick start method comprises following concrete steps:
(1) large power, electrically heating is carried out to steam injection well and producing well, adopt resistance heated, maximum resistance power is 1000KW/ unit level segment length (m), maximum temperature is saturated-steam temperature corresponding to this formation pressure, power is controlled by ground flexible modulation, thus control maximum heating temperature, the heat time is 10 days.
(2) in steam injection well and producing well long oil pipe and short oil pipe, inject solvent simultaneously, type of solvent to be carbon number be 5 alkane solvent, solvent temperature is the saturated-steam temperature under this formation pressure, shown by high temperature viscosity test result, selected solvent is under formation pressure and saturated-steam temperature corresponding to this pressure, under same solvent molar fraction, this solvent is the highest to this reducing crude oil viscosity amplitude; The total injection rate of individual well solvent is 100 tons/day, and long oil pipe and short oil pipe injection rate are 1:1, and injection pressure is the highest exceedes oil reservoir fracture pressure 0.3MPa, and injection length is 3 days.
(3) in steam injection well long oil pipe and short oil pipe, inject the fluid-mixing of solvent and steam, the total injection rate of individual well 200 tons/day, it is 1:1 that long oil pipe and short oil pipe inject ratio simultaneously; In producing well long oil pipe, inject the fluid-mixing of solvent and steam, injection rate is 100 tons/day, and the discharge opeing of producing well short oil pipe, drain age velocity is 200 tons/day.The mass ratio of solvent and steam is three grades and declines step by step; This step time is 15 days, and particularly, at first 5 days, the mass ratio of solvent and steam is 2:1; At middle 5 days, the mass ratio of solvent and steam was 1:1; In the end 5 days, the mass ratio of solvent and steam was 1:2; Steam injection well injection pressure drops to higher than initial reservoir pressure 0.3MPa from higher than oil reservoir fracture pressure 0.3MPa gradually; Lines of producing wells hydraulic coupling drops to initial reservoir pressure gradually from oil reservoir fracture pressure; Between injection-production well, pressure reduction remains 0.3MPa.
(4) close electrical heating, in steam injection well long oil pipe and short oil pipe, inject pure steam simultaneously, producing well long oil pipe and the discharge opeing simultaneously of short oil pipe, enter the SAGD production phase.
With adjacent S AGD well to adopting compared with conventional steam injected cycle preheating starting method, the present embodiment only needs 28 days overall preheating time, fewer than conventional preheating starting method more than 2/3 time (conventional method: 150 days), thus substantially increase heat utilization rate, SAGD rapidly pre-warming can be realized start, accelerate product speed on SAGD; In addition, injected by the quick dilatation of solvent and super fracture pressure, even drain path can be set up, realize the object improving output and recovery ratio.
Embodiment two
The well pattern structure of the present embodiment is identical with embodiment one, and its difference is following concrete steps:
(1) large power, electrically heating is carried out to steam injection well and producing well, adopt resistance heated, maximum resistance power is 1500KW/ unit level segment length (m), maximum temperature is saturated-steam temperature corresponding to this formation pressure, power is controlled by ground flexible modulation, thus control maximum heating temperature, the heat time is 7 days.
(2) in steam injection well and producing well long oil pipe and short oil pipe, inject solvent simultaneously, type of solvent is the alkane solvent of carbon number 10, solvent temperature is the saturated-steam temperature under this formation pressure, shown by high temperature viscosity test result, selected solvent is under formation pressure and saturated-steam temperature corresponding to this pressure, under same solvent molar fraction, this solvent is the highest to this reducing crude oil viscosity amplitude; The total injection rate of individual well solvent is 300 tons/day, and long oil pipe and short oil pipe injection rate are 1:1, and injection pressure is the highest exceedes oil reservoir fracture pressure 0.4MPa, and injection length is 2 days.
(3) in steam injection well long oil pipe and short oil pipe, inject the fluid-mixing of solvent and steam, the total injection rate of individual well 150 tons/day, it is 1:1 that long oil pipe and short oil pipe inject ratio simultaneously; In producing well long oil pipe, inject the fluid-mixing of solvent and steam, injection rate is 100 tons/day, and the discharge opeing of producing well short oil pipe, drain age velocity is 150 tons/day.The mass ratio of solvent and steam is three grades and declines step by step; This step time is 21 days, and particularly, at first 7 days, the mass ratio of solvent and steam is 2:1; At middle 7 days, the mass ratio of solvent and steam was 1:1; In the end 7 days, the mass ratio of solvent and steam was 1:2; Steam injection well injection pressure drops to higher than initial reservoir pressure 0.4MPa from higher than oil reservoir fracture pressure 0.4MPa gradually; Lines of producing wells hydraulic coupling drops to initial reservoir pressure gradually from oil reservoir fracture pressure; Between injection-production well, pressure reduction remains 0.4MPa.
(4) close electrical heating, in steam injection well long oil pipe and short oil pipe, inject pure steam simultaneously, producing well long oil pipe and the discharge opeing simultaneously of short oil pipe, enter the SAGD production phase.
With adjacent S AGD well to adopting compared with conventional steam injected cycle preheating starting method, the present embodiment only needs 30 days overall preheating time, fewer than conventional preheating starting method more than 2/3 time (conventional method 150 days), thus substantially increase heat utilization rate, SAGD rapidly pre-warming can be realized start, accelerate product speed on SAGD; In addition, injected by the quick dilatation of solvent and super fracture pressure, even drain path can be set up, realize the object improving output and recovery ratio.
Embodiment three
The well pattern structure of the present embodiment is identical with embodiment one, and its difference is following concrete steps:
(1) large power, electrically heating is carried out to steam injection well and producing well, adopt resistance heated, maximum resistance power is 2000KW/ unit level segment length (m), maximum temperature is saturated-steam temperature corresponding to this formation pressure, power is controlled by ground flexible modulation, thus control maximum heating temperature, the heat time is 5 days.
(2) in steam injection well and producing well long oil pipe and short oil pipe, inject solvent simultaneously, type of solvent is the alkane solvent of carbon number 20, solvent temperature is the saturated-steam temperature under this formation pressure, shown by high temperature viscosity test result, selected solvent is under formation pressure and saturated-steam temperature corresponding to this pressure, under same solvent molar fraction, this solvent is the highest to this reducing crude oil viscosity amplitude; The total injection rate of individual well solvent is 500 tons/day, and long oil pipe and short oil pipe injection rate are 1:1, and injection pressure is the highest exceedes oil reservoir fracture pressure 0.5MPa, and injection length is 1 day.
(3) in steam injection well long oil pipe and short oil pipe, inject the fluid-mixing of solvent and steam, the total injection rate of individual well 100 tons/day, it is 1:1 that long oil pipe and short oil pipe inject ratio simultaneously; In producing well long oil pipe, inject the fluid-mixing of solvent and steam, injection rate is 100 tons/day, and the discharge opeing of producing well short oil pipe, drain age velocity is 100 tons/day.The mass ratio of solvent and steam is three grades and declines step by step; This step time is 30 days, and particularly, at first 10 days, the mass ratio of solvent and steam is 2:1; At middle 10 days, the mass ratio of solvent and steam was 1:1; In the end 10 days, the mass ratio of solvent and steam was 1:2; Steam injection well injection pressure drops to higher than initial reservoir pressure 0.5MPa from higher than oil reservoir fracture pressure 0.5MPa gradually; Lines of producing wells hydraulic coupling drops to initial reservoir pressure gradually from oil reservoir fracture pressure; Between injection-production well, pressure reduction remains 0.5MPa.
(4) close electrical heating, in steam injection well long oil pipe and short oil pipe, inject pure steam simultaneously, producing well long oil pipe and the discharge opeing simultaneously of short oil pipe, enter the SAGD production phase.
With adjacent S AGD well to adopting compared with conventional steam injected cycle preheating starting method, the present embodiment only needs 36 days overall preheating time, fewer than conventional preheating starting method more than 2/3 time (conventional method 150 days), thus substantially increase heat utilization rate, SAGD rapidly pre-warming can be realized start, accelerate product speed on SAGD; In addition, injected by the quick dilatation of solvent and super fracture pressure, even drain path can be set up, realize the object improving output and recovery ratio.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (12)
1. a heavy crude reservoir SAGD quick start method, the method at least comprises the following steps:
(1) steam injection well and producing well electrical heating;
(2) in steam injection well and producing well long oil pipe and short oil pipe, inject solvent simultaneously;
(3) in steam injection well long oil pipe and short oil pipe, inject the fluid-mixing of solvent and steam simultaneously, in producing well long oil pipe, inject the fluid-mixing of solvent and steam, the discharge opeing of producing well short oil pipe;
(4) close electrical heating, in steam injection well long oil pipe and short oil pipe, inject pure steam simultaneously, producing well long oil pipe and the discharge opeing simultaneously of short oil pipe.
2. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterized in that: before step (1) is implemented, the long oil pipe that one stretches to horizontal segment tiptoe is entered all down in steam injection well and producing well pit shaft, one stretches to horizontal segment heel and the short oil pipe be parallel to each other with long oil pipe, 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 characterized in that: in step (1), adopt resistance heated, the maximum resistance power of every meter of horizontal section length is 1000-2000KW, maximum temperature is saturated-steam temperature corresponding to this formation pressure, control power by ground flexible modulation, thus control maximum heating temperature.
4. heavy crude reservoir SAGD quick start method as claimed in claim 1, is characterized in that: in step (1), adopts electromagnetism or heating using microwave.
5. heavy crude reservoir SAGD quick start method as claimed in claim 1, is characterized in that: the heat time in step (1) is 5-10 days.
6. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterized in that: in step (2), type of solvent is the alkane solvent of carbon number from 5-20, and solvent temperature is the saturated-steam temperature under this formation pressure.
7. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterized in that: in step (2), selected solvent is under formation pressure and saturated-steam temperature corresponding to this pressure, under same solvent molar fraction, the solvent the highest to reducing crude oil viscosity amplitude or dicyandiamide solution.
8. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterized in that: in step (2), the total injection rate of individual well solvent is 100-500 ton/sky, long oil pipe and short oil pipe injection rate are 1:1, injection pressure is the highest exceedes oil reservoir fracture pressure 0.3-0.5MPa, and injection length is 1-3 days.
9. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterized in that: in step (3), the total injection rate 100-200 ton/sky of steam injection well, long oil pipe and short oil pipe implantation quality speed proportional are 1:1, producing well long oil pipe injection rate is 100 tons/day, the discharge opeing of producing well short oil pipe, short oil pipe drain age velocity is 100-200 ton/sky.
10. heavy crude reservoir SAGD quick start method as claimed in claim 1, it is characterized in that: in step (3), the solvent in described fluid-mixing and the mass ratio of steam are three grades, and decline step by step with injection length; Particularly, at front 5-10 days, solvent and quality of steam ratio are 2:1; At middle 5-10 days, solvent and quality of steam ratio are 1:1; In the end 5-10 days, solvent and quality of steam ratio are 1:2; This step time is 15-30 days.
11. heavy crude reservoir SAGD quick start methods as claimed in claim 1, it is characterized in that: in step (3), steam injection well injection pressure linearly drops to higher than initial reservoir pressure 0.3-0.5MPa gradually from higher than oil reservoir fracture pressure 0.3-0.5MPa; Lines of producing wells hydraulic coupling linearly drops to initial reservoir pressure gradually from oil reservoir fracture pressure; Between injection-production well, pressure reduction remains 0.3-0.5MPa.
12. heavy crude reservoir SAGD quick start methods as claimed in claim 1, it is characterized in that: in step (4), when the shaft bottom mass dryness fraction injecting steam for the SAGD production phase is less than 50%, electrical heating in good time unlatching steam injection well, In Situ Heating also 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 |
|---|---|
| CN104453805A true CN104453805A (en) | 2015-03-25 |
| CN104453805B CN104453805B (en) | 2017-06-13 |
Family
ID=52900480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410586578.XA Active CN104453805B (en) | 2014-10-28 | 2014-10-28 | A kind of heavy crude reservoir SAGD quick start method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104453805B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832141A (en) * | 2015-04-13 | 2015-08-12 | 中国石油天然气股份有限公司 | Solvent-assisted horizontal well interwell communication method |
| CN105178931A (en) * | 2015-09-06 | 2015-12-23 | 中国石油天然气股份有限公司 | Method for increasing initial production speed of SAGD (Steam Assisted Gravity Drainage) |
| CN106593367A (en) * | 2015-10-14 | 2017-04-26 | 中国石油天然气股份有限公司 | Start method for steam-assisted gravity drainage of heavy oil reservoir |
| CN106917616A (en) * | 2015-12-28 | 2017-07-04 | 中国石油天然气股份有限公司 | The preheating device and method of heavy crude reservoir |
| 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 |
| CN109138976A (en) * | 2018-07-23 | 2019-01-04 | 中国石油天然气股份有限公司 | Dual horizontal well preheats the judgment method and dual horizontal well preheating device for turning SAGD opportunity |
| 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 |
| 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 |
| CN110242266A (en) * | 2019-07-08 | 2019-09-17 | 新疆中凌工程技术有限公司 | A kind of horizontal well group of SAGD is temporarily stifled to be segmented dilatation reservoir reconstruction method |
| CN110318722A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Ground layer for heating extracts oil gas system and method |
| 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 |
| CN113250665A (en) * | 2020-02-11 | 2021-08-13 | 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 |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4753293A (en) * | 1982-01-18 | 1988-06-28 | Trw Inc. | Process for recovering petroleum from formations containing viscous crude or tar |
| US5860475A (en) * | 1994-04-28 | 1999-01-19 | Amoco Corporation | Mixed well steam drive drainage process |
| US20110253368A1 (en) * | 2008-09-26 | 2011-10-20 | Conocophillips Company | Process for enhanced production of heavy oil using microwaves |
| WO2012037147A1 (en) * | 2010-09-14 | 2012-03-22 | Conocophillips Company | Gravity drainage startup using rf & solvent |
| CN103089230A (en) * | 2013-01-24 | 2013-05-08 | 中国石油天然气股份有限公司 | Oil deposit extraction method of solvent assisted fireflooding gravity drainage |
| US20130118737A1 (en) * | 2011-11-16 | 2013-05-16 | Resource Innovations Inc. | Method for initiating circulation for steam assisted gravity drainage |
| US20130213653A1 (en) * | 2012-02-22 | 2013-08-22 | Conocophillips Company | Producer snorkel or injector toe-dip to accelerate communication between sagd producer and injector |
| CN103615224A (en) * | 2013-11-08 | 2014-03-05 | 中国石油天然气股份有限公司 | Method and well network structure for improving steam assisted gravity drainage for extracting heavy oil reservoirs by aid of solvents |
-
2014
- 2014-10-28 CN CN201410586578.XA patent/CN104453805B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4753293A (en) * | 1982-01-18 | 1988-06-28 | Trw Inc. | Process for recovering petroleum from formations containing viscous crude or tar |
| US5860475A (en) * | 1994-04-28 | 1999-01-19 | Amoco Corporation | Mixed well steam drive drainage process |
| US20110253368A1 (en) * | 2008-09-26 | 2011-10-20 | Conocophillips Company | Process for enhanced production of heavy oil using microwaves |
| WO2012037147A1 (en) * | 2010-09-14 | 2012-03-22 | Conocophillips Company | Gravity drainage startup using rf & solvent |
| US20130118737A1 (en) * | 2011-11-16 | 2013-05-16 | Resource Innovations Inc. | Method for initiating circulation for steam assisted gravity drainage |
| US20130213653A1 (en) * | 2012-02-22 | 2013-08-22 | Conocophillips Company | Producer snorkel or injector toe-dip to accelerate communication between sagd producer and injector |
| CN103089230A (en) * | 2013-01-24 | 2013-05-08 | 中国石油天然气股份有限公司 | Oil deposit extraction method of solvent assisted fireflooding gravity drainage |
| CN103615224A (en) * | 2013-11-08 | 2014-03-05 | 中国石油天然气股份有限公司 | Method and well network structure for improving steam assisted gravity drainage for extracting heavy oil reservoirs by aid of solvents |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832141A (en) * | 2015-04-13 | 2015-08-12 | 中国石油天然气股份有限公司 | Solvent-assisted horizontal well interwell communication method |
| 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 |
| CN105178931A (en) * | 2015-09-06 | 2015-12-23 | 中国石油天然气股份有限公司 | Method for increasing initial production speed of SAGD (Steam Assisted Gravity Drainage) |
| 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 |
| CN106593367A (en) * | 2015-10-14 | 2017-04-26 | 中国石油天然气股份有限公司 | Start method for steam-assisted gravity drainage of heavy oil reservoir |
| CN106917616A (en) * | 2015-12-28 | 2017-07-04 | 中国石油天然气股份有限公司 | The preheating device and method of heavy crude reservoir |
| 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 |
| CN110318722A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Ground layer for heating extracts oil gas system and method |
| 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 |
| CN109138976A (en) * | 2018-07-23 | 2019-01-04 | 中国石油天然气股份有限公司 | Dual horizontal well preheats the judgment method and dual horizontal well preheating device for turning SAGD opportunity |
| 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 |
| CN110242266A (en) * | 2019-07-08 | 2019-09-17 | 新疆中凌工程技术有限公司 | A kind of horizontal well group of SAGD is temporarily stifled to be segmented dilatation reservoir reconstruction method |
| 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 |
| CN113250665A (en) * | 2020-02-11 | 2021-08-13 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104453805B (en) | 2017-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104453805A (en) | Rapid start method for heavy oil reservoir steam assisted gravity drainage | |
| CN105649588B (en) | Utilize the method for SAGD production of heavy oil reservoir | |
| CN102900415B (en) | Method for mining deep and ultra-deep thick oil pools by using double horizontal well fire flooding drainage | |
| CN103225497B (en) | Exploitation method of vaporizing formation water and displacing heavy oil by microwaves in situ | |
| CN108119113B (en) | Method for exploiting thick oil | |
| CN104265253B (en) | Method for exploiting heavy oil reservoir by adopting SAGD (Steam Assisted Gravity Drainage) | |
| CN110029976B (en) | Hot nitrogen-assisted heavy oil reservoir steam huff-puff oil production system and method | |
| CN104500012A (en) | SAGD starting method for interlayer heterogeneous thickened oil pool | |
| CN108756839B (en) | Oil shale heat insulation synergistic in-situ conversion method and system | |
| CN104832141B (en) | A kind of solvent subsidiary level interwell communication method | |
| CN106593377A (en) | Steam flooding starting method for super-heavy oil horizontal wells | |
| CN106593367B (en) | The starting method of heavy crude reservoir steam assisted gravity drainage | |
| CN112324409B (en) | Method for producing solvent in situ in oil layer to recover thick oil | |
| CN108952653A (en) | The thickened oil recovery method of electric heating assisted gravity oil drainage | |
| RU2582256C1 (en) | Method for development of high-viscosity oil or bitumen | |
| CN109838224A (en) | The method for the exploitation super-viscous oil that auxiliary producing well is combined with SAGD | |
| US20130008651A1 (en) | Method for hydrocarbon recovery using sagd and infill wells with rf heating | |
| CN102352744A (en) | Circulating hot water heavy oil thermal recovery system for ultra-deep well and process thereof | |
| CN107558975B (en) | Method for improving later development of steam assisted gravity drainage by using viscosity reducer | |
| CA2890491C (en) | Hydrocarbon recovery start-up process | |
| CN204371132U (en) | SAGD dual horizontal well cyclic preheat tubing string | |
| CN109630080A (en) | The recovery method of super-heavy oil deposit steam assisted gravity drainage producing initial stage | |
| RU2310744C1 (en) | Method for heavy and/or highly-viscous hydrocarbon production from underground deposit | |
| RU2483207C2 (en) | Development method of fractured high-viscosity oil deposit | |
| RU2461705C1 (en) | Method for development of high-viscous oil deposit at thermal effect |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |