CN103089230A - Oil deposit extraction method of solvent assisted fireflooding gravity drainage - Google Patents
Oil deposit extraction method of solvent assisted fireflooding gravity drainage Download PDFInfo
- Publication number
- CN103089230A CN103089230A CN2013100275387A CN201310027538A CN103089230A CN 103089230 A CN103089230 A CN 103089230A CN 2013100275387 A CN2013100275387 A CN 2013100275387A CN 201310027538 A CN201310027538 A CN 201310027538A CN 103089230 A CN103089230 A CN 103089230A
- Authority
- CN
- China
- Prior art keywords
- well
- horizontal
- injection
- production well
- production
- 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
Images
Abstract
The invention relates to an oil deposit extraction method of solvent assisted fireflooding gravity drainage. The method comprises a first step that the extraction area of the oil deposit is provided with a horizontal producing well and an injection-production pattern of a vertical injecting well, the horizontal producing well and the vertical injecting well are arranged on the same vertical section of the same oil layer and form an injection-production well group, and a second step that a cosolvent horizontal well is arranged between the adjacent injection-production well group of the oil layer in the first step. The cosolvent has the function of dissolving and viscosity reduction of the crude oil, the viscosity of the oil layer on the flank of the horizontal producing well of the injection-production well group is reduced substantially, and the effective production time is long and the recovery efficiency is high. Moreover, due to the horizontal tractive effort of a cosolvent cavity of the horizontal flank, a large amount of air expands toward the flank following the combustion zone, and therefore the safety risk that the air penetrates into the production well bottom directly is lowered.
Description
Technical field
The invention relates to the method for the auxiliary fireflood gravity drainage exploitation of a kind of solvent oil reservoir.
Background technology
Fireflood gravity drainage techniques (Toe-to Heel Air Injection, being called for short THAI) technology is the patented technology of Canadian Petrobank company, its know-why is to dispose the vertical Injection Well with a bite of a bite horizontal production well at the same vertical profile of same oil reservoir, the horizontal segment of horizontal production well is positioned at the oil reservoir bottom, apart from 1～2 meter on boundary at the bottom of the oil reservoir, vertical Injection Well is positioned at the vertical top of tiptoe of horizontal production well horizontal segment, 5～7 meters on the horizontal segment tiptoe of its vertical Injection Well bottom hole spacing horizontal production well.In the fireflood manufacturing process, vertical Injection Well and horizontal production well at first adopt the mode of steam soak or downhole electric heating to carry out cyclic preheat simultaneously, after forming thermal communication between the horizontal segment tiptoe of vertical Injection Well shaft bottom and horizontal production well, inject the air igniting from vertical Injection Well, vertical Injection Well continues air injection, horizontal production well continuous production after lighting oil reservoir.Air is because vertical convective mass transfer occurs with the crude oil of burning heating in Float upward function, and crude oil flows under the influence of gravity in the horizontal production well horizontal segment of oil reservoir bottom, thereby is plucked out of the ground.Laboratory experiment shows, the fireflood gravity drainage techniques has the advantages such as simple, the upper product speed of well pattern form is fast, recovery ratio is high, but Petrobank company shows in the THAI of Whitesands Project Areas pilot test, the basic limitation of THAI technology has following three to select: the one, and the coke zone in oil reservoir baked wheaten cake process is thinner, when relatively poor to the horizontal firing section closure of horizontal production well, the air that vertical Injection Well injects enters in the horizontal segment of horizontal production well easily, cause fire to alter, thereby burn out the horizontal segment screen casing, serious potential safety hazard occurs; The 2nd, for the super-heavy oil deposit of viscosity too high (underground viscosity〉100 ten thousand centipoises), because live wire is too large to the resistance of horizontal segment flank expansion, cause combustion front to continue to advance along horizontal segment, and the combustion range of flank only is 5～10 meters, can't effectively employ the oil reservoir reserves between the adjacent well group; The 3rd, because high Crude viscosity causes the oil reservoir resistance large, in the simple fireflood gravity drainage process, the moveable oil band that forms is narrower, the air that a large amount of crude oil is injected into is burnt, according to incomplete estimation, in the THAI pilot test process of Whitesands Project Areas, in the zone that on average air of each well group involves, there is the crude oil about 30% to be burnt, therefore greatly reduces recovery ratio and exploitation benefit.
Summary of the invention
One object of the present invention is to provide the method for the auxiliary fireflood gravity drainage exploitation of a kind of solvent oil reservoir.
The water horizontal well is disposed in oil reservoir middle and upper part in the middle of adjacent injection-production well group, before burning, this horizontal well carries out 3～5 cycles of steam soak, the vapor chamber that takes on a certain scale, then inject continuously the lightweight solvents such as a certain amount of propane, butane, pentane or hexane to this horizontal well and fill up vapor chamber, thereby form respectively two continuous solvent chambeies at the horizontal production well left and right sides of injection-production well group flank.In the fireflood process, because solvent falls glutinous effect to the dissolving of crude oil, the oil reservoir viscosity decrease of injection-production well group horizontal production well flank, therefore in the fireflood process, the oil reservoir resistance of horizontal production well horizontal segment flank is little, air greatly improves to the ability of flank burning expansion, thus fireflood to involve scope large, effective production time is long; In addition, because it is larger that solvent, is positioned at the moveable oil band scope of burning leading edge coke zone front to extractive distillation effect and the deasphalting of crude oil, only stay heavy asphalt and colloid and remain in and form coke zone in the oil reservoir, the former oil mass of therefore being burnt in the baked wheaten cake process is few, and recovery ratio is high; In addition, owing to the lateral traction effect of horizontal production well horizontal segment flank solvent chamber to live wire, large quantity of air is expanded to flank with combustion zone, directly scurries into the security risk that occurs at the bottom of the producing well thereby therefore reduced air.Mining site actual production Contrast on effect shows, the fireflood of the auxiliary fireflood gravity drainage techniques of solvent involves scope burns large 10～40% than conventional THAI, effective production time burns long 20～50% than conventional THAI, recovery ratio is burnt than conventional THAI and is improved 10～45%, and peak value output is burnt than conventional THAI and improved 15～46%.
For reaching above-mentioned purpose, the invention provides the method for the auxiliary fireflood gravity drainage exploitation of a kind of solvent oil reservoir: the method for the auxiliary fireflood gravity drainage exploitation of a kind of solvent oil reservoir, described method comprises the steps:
(1) horizontal production well and vertical Injection Well flooding pattern are set in the oil reservoir production zone: the same vertical section at same oil reservoir arranges horizontal production well and vertical Injection Well, forms an injection-production well group;
(2) between the adjacent injection-production well group of the oil reservoir of step (1), arrange and annotate the aqueous solvent horizontal well.
According to method of the present invention, described oil reservoir is heavy crude reservoir, and preferred viscosities is the heavy crude reservoir of 10000～1000000 centipoises; More preferably 15 ~ 30 meters of the oil reservoir individual layer effective thickness of oil reservoir.
In practice of construction, can a plurality of injection-production well groups be set according to the oil reservoir concrete condition and form flooding pattern, the magnitude setting of injection-production well group and density can be determined according to on-the-spot oil reservoir situation and the condition of production by those skilled in the art, need not those skilled in the art and pay more creative work.
Wherein said notes aqueous solvent horizontal well can adopt the pipe well of prior art structure, and those skilled in the art can select the pipe well of suitable prior art according to record of the present invention, is the common cutting seam sieve tube completion of prior art for example.
One skilled in the art will appreciate that this notes aqueous solvent horizontal well must comprise to the vertical section that wherein injects solvent.
According to method of the present invention, 30 ~ 46 meters of the horizontal segment lateral separations of the horizontal production well of described adjacent injection-production well group, the horizontal production well horizontal segment is apart from 1 ~ 2 meter of oil reservoir bottom, vertical Injection Well is positioned at horizontal production well horizontal segment tiptoe vertical direction top, 5 ~ 7 meters on the horizontal segment tiptoe of vertical Injection Well bottom hole spacing horizontal production well.
According to method of the present invention, the horizontal segment of described notes aqueous solvent horizontal well is apart from 3～5 meters of tops of oil horizon, the horizontal section length of the horizontal section length of notes aqueous solvent horizontal well and the horizontal production well of injection-production well group equates that the horizontal segment of the horizontal production well of the horizontal segment of notes aqueous solvent horizontal well and the injection-production well group on its both sides is parallel and horizontal range is identical; Annotate the toe end of horizontal segment of aqueous solvent horizontal well and heel end and be in same plane with toe end and the heel end of the horizontal segment of the horizontal production well of injection-production well group respectively, described plane is perpendicular with the horizontal segment of the horizontal production well of the horizontal segment of annotating the aqueous solvent horizontal well and injection-production well group.
The toe end of the horizontal segment of notes aqueous solvent horizontal well of the present invention and heel end are in same plane with the toe end of the horizontal segment of the horizontal production well of injection-production well group and heel end respectively and can be understood as:
The toe end of the horizontal segment of the toe end of the horizontal segment of notes aqueous solvent horizontal well and the horizontal production well of injection-production well group is in same plane, and the heel end of the horizontal segment of the horizontal production well of the heel end of the horizontal segment of notes aqueous solvent horizontal well and injection-production well group is in same plane; Perhaps
The heel end of the horizontal segment of the toe end of the horizontal segment of notes aqueous solvent horizontal well and the horizontal production well of injection-production well group is in same plane, and the toe end of the horizontal segment of the horizontal production well of the heel end of the horizontal segment of notes aqueous solvent horizontal well and injection-production well group is in same plane.
According to method of the present invention, described method also comprises the steps:
A) annotate aqueous solvent horizontal well 3 ~ 5 cycles of steam soak;
B) after notes aqueous solvent horizontal well is handled up and finished, inject continuously solvent to annotating the aqueous solvent horizontal well, closing well after finishing;
C) horizontal production well in the injection-production well group begins cyclic preheat with vertical Injection Well, after forming thermal communication between the horizontal segment tiptoe of the vertical Injection Well of injection-production well group and horizontal production well, inject continuously the oxygen-enriched air of 300～1000 side's oxygen contents 90% ~ 99% to vertical Injection Well, and light oil reservoir;
D) vertical Injection Well injects air continuously, and air injection speed is 3000～20000 side/skies, and horizontal production well is produced continuously; The content of oxygen in the continuous monitoring horizontal production well output gas.
After producing end, close vertical Injection Well and horizontal production well and get final product.
According to method of the present invention, in the step a), described steam soak can be according to any cyclic steam stimulation method operation of prior art, the preferred injection parameter of the present invention is: cycle steam injection amount is 5～10 tons/unit level segment length (rice), cycle is boiled in a covered pot over a slow fire 3～5 days well time, 30～45 days back production production times in cycle, cycle production-injection ratio 1.3～1.7.
When back production daily oil production during less than 1 ton/day, change the lower whorl cycle over to.
According to method of the present invention, in the step b), described solvent is carbon number at 3～8 light paraffins solvent;
Described light paraffins is this area generic term, and those skilled in the art are the clear definition of knowing described light paraffins all, and the present invention is preferably one or more the mixture in propane, butane, pentane and the hexane; The solvent injection rate equals 1.2～1.5 times of last cycle lifting rate of steam soak.
According to method of the present invention, after the described thermal communication of step c) formed, the average temperature of oil reservoir reached 150～220 ℃ between the horizontal segment tiptoe of vertical Injection Well and horizontal production well.
In above-mentioned exploitation method provided by the invention, preferably, in step c), the cyclic preheat mode can adopt the modes such as downhole electric heating or steam injection cyclic preheat;
Wherein, downhole electric heating and steam injected cycle preheating are this area current techique.
Wherein the cyclic preheat that preferably adopts of the present invention is: stretch into horizontal production well horizontal segment tiptoe long oil pipe steam injection, stretch into the short oil pipe back production of horizontal segment heel; The average temperature that is preheating to oil reservoir between the horizontal segment tiptoe of vertical Injection Well and horizontal production well reaches 150～220 ℃.
In above-mentioned exploitation method provided by the invention, in step c), the described oil reservoir of lighting can adopt mode any in the prior art to carry out, and preferably, the described oil reservoir of lighting can adopt down-hole electric ignition mode;
Sparking mode for example can be to inject the spontaneous ignition that a slug oxygen enrichment (oxygen content 90%～99%) enters oil reservoir, after oil reservoir is lighted, is converted to continuous injection air;
According to method of the present invention, the bottomhole injection pressure that injects continuously vertical Injection Well behind the air in the step d) is controlled at 0.2～0.5MPa with the difference that the shaft bottom of horizontal production well produces the stream pressure, and air injection speed is 3000～20000 side/skies.
According to method of the present invention, when oxygen content rose to 10～15%, the gas injection speed of vertical Injection Well reduced by 10～30% in the step d), and when oxygen content dropped to 0～5% in the output gas, the gas injection speed of vertical Injection Well improved 10～30%.
Mining site actual production effect shows that the auxiliary fireflood gravity drainage exploitation of solvent provided by the present invention oil reservoir method has following technique effect:
(1) exploitation method provided by the present invention adopts the auxiliary fireflood gravity drainage exploitation of solvent, oil reservoir middle and upper part in the middle of adjacent injection-production well group is disposed and is annotated flatly the aqueous solvent horizontal well, produce vapor chamber by first steam soak, then inject the mode that solvent forms the solvent chamber, flank at injection-production well group horizontal segment has all formed the continuous solvent chamber isometric with annotating the flat segment length of solvent levels well water, therefore in whole baked wheaten cake process, solvent all can play long-acting auxiliary oil drainage effect, finishes until produce.
(2) in the fireflood process, solvent in solvent chamber crude oil continuous and outside, solvent chamber carries out molecular diffusion and convection current, thereby glutinous effect falls in the high-efficiency dissolution that plays crude oil, this is so that the oil reservoir viscosity decrease of injection-production well group horizontal production well flank, therefore in the fireflood process, the oil reservoir resistance of horizontal production well horizontal segment flank is little, air greatly improves to the ability of flank burning expansion, therefore fireflood involves scope and burns greatly 10～40% than conventional THAI, and effective production time burns long 20～50% than conventional THAI.
(3) because solvent also exists efficient extractive distillation effect and deasphalting to crude oil, after being positioned at the crude oil process deasphalting of solvent of burning leading edge coke zone front, lightweight in the crude oil and middle matter component are extracted out with solvent and flow downward in the coke zone front, the moveable oil band that the formation scope is larger, and has higher fluid ability, only staying heavy asphalt and colloid remains in and forms coke zone in the oil reservoir, the former oil mass of therefore being burnt in the baked wheaten cake process is few, and recovery ratio is burnt than conventional THAI and improved 10～45%.
(4) because near the crude oil flow ability the solvent chamber of the horizontal segment flank of injection-production well group horizontal production well is high, injecting air, to enter this regional flow resistance little, to having produced effective lateral traction effect in the live wire progradation, large quantity of air is expanded to flank with combustion zone, combustion front enlarges, peak value output is burnt than conventional THAI and is improved 15～46%, directly scurries into the security risk that occurs at the bottom of the producing well thereby also reduced air.
(5) because solvent is plucked out of flow into producing well with crude oil in the baked wheaten cake process at the bottom of, so solvent can reuse, good in economic efficiency.
Description of drawings
The solvent that Fig. 1 provides for embodiment 1,2 is assisted the well spacing schematic diagram of fireflood gravity drainage production of heavy oil reservoir method;
Fig. 2 is the front well location sectional drawing of Fig. 1, and its midship section is perpendicular to notes solvent levels well horizontal segment, and the vertical Injection Well of process;
Fig. 3 is the side well location sectional drawing of Fig. 1, its midship section be parallel to annotate solvent levels well horizontal segment, and through the well location sectional drawing of vertical Injection Well;
Fig. 4 a is the baked wheaten cake district band expansion distribution schematic diagram at the baked wheaten cake initial stage of embodiment 1,2 methods;
Fig. 4 b is the baked wheaten cake leading edge moveable oil band of embodiment 1,2 methods and the baked wheaten cake district band expansion distribution schematic diagram in the poly-also moment of solvent chamber;
Fig. 4 c be the baked wheaten cake leading edge moveable oil band of embodiment 1,2 methods and solvent chamber poly-and after baked wheaten cake district band expansion distribution schematic diagram.
Main drawing reference numeral explanation:
Annotate aqueous solvent horizontal well 11/12/13 horizontal production well 21/22 vertical Injection Well 31/32
Solvent chamber 41/42 air chamber, 51 coke zones 52
The specific embodiment
Below describe the beneficial effect of implementation process of the present invention and generation in detail by specific embodiment, be intended to help the reader to understand better essence of the present invention and characteristics, but not as the restriction to this case practical range.
Embodiment 1
Present embodiment provides a kind of solvent to assist fireflood gravity drainage production of heavy oil reservoir method, and the major oil reservoir of this heavy crude reservoir buries shallow, and average buried depth is 450m, and initial reservoir pressure is 4.2MPa, and the original reservoir temperature is 26 ℃; Crude viscosity is high, and the degassed crude viscosity is 1,000,000 centipoises under the reservoir temperature, the effectively average 15m of core intersection.
The auxiliary fireflood gravity drainage production of heavy oil reservoir method of the solvent that present embodiment provides comprises following concrete steps:
(1) adjacent two pairs of horizontal production well and vertical Injection Well flooding pattern at first are set in this heavy crude reservoir production zone, particularly, same vertical profile at same oil reservoir is disposed the vertical Injection Well with a bite of a bite horizontal production well, forms an injection-production well group; Preferably, 30 meters of the horizontal segment lateral separations of the interior horizontal production well of adjacent two injection-production well groups, the horizontal segment of horizontal production well is positioned at the oil reservoir bottom, apart from 1 meter on boundary at the bottom of the oil reservoir, 400 meters of the horizontal section lengths of horizontal production well, vertical Injection Well is positioned at the vertical top of tiptoe of horizontal production well horizontal segment, 5 meters on the horizontal segment tiptoe of its completion bottom hole spacing horizontal production well.
(2) in the middle of adjacent injection-production well group, dispose and annotate flatly the aqueous solvent horizontal well; Preferably, the horizontal segment of annotating the aqueous solvent horizontal well is positioned at the oil reservoir middle and upper part, apart from 3 meters on circle, oil reservoir top, the horizontal section length of annotating the aqueous solvent horizontal well equates with the horizontal section length of horizontal production well in the injection-production well group, be 400 meters, lateral separation is 15 meters between the horizontal segment of notes aqueous solvent horizontal well and the horizontal segment of the horizontal production well in the adjacent injection-production well group.
The schematic diagram of above-mentioned horizontal flooding pattern such as Fig. 1, Fig. 2, shown in Figure 3.
(3) annotating the aqueous solvent horizontal well begins continuous steam and handles up 3 cycles.Preferably, the injection parameter of steam soak is: period 1 steam injection amount is 5 tons/unit level segment length (rice), is 2000 tons; Second round, the steam injection amount was 6 tons/unit level segment length (rice), was 2400 tons; Period 3 steam injection amount is 7 tons/unit level segment length (rice), is 2800 tons; Cycle is boiled in a covered pot over a slow fire 3 days well time; 30 days back production production times in cycle, period 1 production-injection ratio 1.3, second round, production-injection ratio 1.4, period 3 production-injection ratio 1.5.
(4) after notes aqueous solvent horizontal well is handled up and finished, inject continuously solvent in the aqueous solvent horizontal well to annotating, preferably, described solvent is the mixture that propane and butane dispose according to mass percent 1:1; The solvent injection rate equals 1.2 times of last cycle lifting rate of steam soak, is 5040 tons.
(5) after the notes solvent finishes, annotate aqueous solvent horizontal well closing well.
(6) horizontal production well in the injection-production well group begins cyclic preheat with vertical Injection Well; Preferably, the cyclic preheat mode adopts general downhole electric heating technology.
(7) average temperature of oil reservoir reaches 150 ℃ between the horizontal segment tiptoe of the vertical Injection Well of injection-production well group and horizontal production well, form after the thermal communication, inject continuously the oxygen-enriched air of 300 side's oxygen contents 90% to vertical Injection Well, and adopt electric ignition mode in down-hole to light oil reservoir.
(8) vertical Injection Well injects air continuously, and air injection speed is 3000 side/skies, and horizontal production well is produced continuously.Preferably, the bottomhole injection pressure of vertical Injection Well is controlled at 4.4MPa, and the shaft bottom of horizontal production well produces the stream pressure-controlled at 4.2MPa, and both differences are controlled at 0.2MPa.
(9) content of oxygen in the continuous monitoring horizontal production well output gas, every two hours monitoring once.Preferably, when oxygen content rose to 10%, the gas injection speed of vertical Injection Well reduced by 10%, and when oxygen content dropped to 0% in the output gas, the gas injection speed of vertical Injection Well improved 30%.
(10) produce end, close vertical Injection Well and horizontal production well.
The baked wheaten cake initial stage burn district's band expansion distribute, burn the baked wheaten cake district band expansion poly-with the solvent chamber and constantly of leading edge moveable oil band distribute and burn leading edge moveable oil band with the solvent chamber poly-and after baked wheaten cake district band expand distribution shown in Fig. 4 a, 4b, 4c.
Table 1 is the condition of production statistics of present embodiment.As shown in table 1, the conventional fireflood gravity drainage condition of production of existing well group in this heavy crude reservoir production zone, adopt the fireflood gravity drainage to produce the development scheme that finishes, the economical and effective production time is about 6.1 years always, and final fireflood involves scope (swept volume) and is 90000m
3, peak value output 40t/d, ultimate recovery is about 29%, because the too early has channeling of horizontal production well and closing well; And the well group of the present embodiment in this heavy crude reservoir production zone employing the inventive method economical and effective production time is 7.32, and final fireflood involves scope (swept volume) and is 99000m
3, peak value output 46t/d, ultimate recovery are 39%, recovery ratio has improved 10 percentage points than conventional steam assisted gravity drainage techniques exploitation.And in producing fire does not occur and alter, solvent and crude oil together are plucked out of, and by the common separated tower of ground prior art, can with separated from solvent and by the re-injection pipeline, realize the repeatedly recycling of solvent.
Table 1
Present embodiment provides a kind of solvent to assist fireflood gravity drainage production of heavy oil reservoir method, and the average buried depth of the major oil reservoir of this heavy crude reservoir is 400m, and initial reservoir pressure is 3.7MPa, and the original reservoir temperature is 23 ℃; The degassed crude viscosity is 10,000 centipoises under the reservoir temperature, the effectively average 30m of core intersection.
The auxiliary fireflood gravity drainage production of heavy oil reservoir method of the solvent that present embodiment provides comprises following concrete steps:
(1) adjacent two pairs of horizontal production well and vertical Injection Well flooding pattern at first are set in this heavy crude reservoir production zone, particularly, same vertical profile at same oil reservoir is disposed the vertical Injection Well with a bite of a bite horizontal production well, forms an injection-production well group; Preferably, 46 meters of the horizontal segment lateral separations of the interior horizontal production well of adjacent two injection-production well groups, the horizontal segment of horizontal production well is positioned at the oil reservoir bottom, apart from 2 meters on boundary at the bottom of the oil reservoir, 400 meters of the horizontal section lengths of horizontal production well, vertical Injection Well is positioned at the vertical top of tiptoe of horizontal production well horizontal segment, 7 meters on the horizontal segment tiptoe of its completion bottom hole spacing horizontal production well.
(2) in the middle of adjacent injection-production well group, dispose and annotate flatly the aqueous solvent horizontal well.Preferably, the horizontal segment of annotating the aqueous solvent horizontal well is positioned at the oil reservoir middle and upper part, apart from 5 meters on circle, oil reservoir top, the horizontal section length of annotating the aqueous solvent horizontal well equates with the horizontal section length of horizontal production well in the injection-production well group, be 400 meters, lateral separation is 23 meters between the horizontal segment of notes aqueous solvent horizontal well and the horizontal segment of the horizontal production well in the adjacent injection-production well group.
The schematic diagram of above-mentioned horizontal flooding pattern such as Fig. 1, Fig. 2, shown in Figure 3.
(3) annotating the aqueous solvent horizontal well begins continuous steam and handles up 5 cycles.Preferably, the injection parameter of steam soak is: period 1 steam injection amount is 5 tons/unit level segment length (rice), is 2000 tons; Second round, the steam injection amount was 6 tons/unit level segment length (rice), was 2400 tons; The 3rd～period 5 steam injection amount is 7 tons/unit level segment length (rice), is 2800 tons; Cycle is boiled in a covered pot over a slow fire 5 days well time; 45 days back production production times in cycle, period 1 production-injection ratio 1.3, second round, production-injection ratio 1.4, period 3 production-injection ratio 1.5, period 4 production-injection ratio 1.6, period 5 production-injection ratio 1.7.
(4) after notes aqueous solvent horizontal well is handled up and finished, inject continuously solvent in the aqueous solvent horizontal well to annotating; Preferably, described solvent is the mixture that pentane and hexane dispose according to mass percent 1:1; The solvent injection rate equals 1.5 times of last cycle lifting rate of steam soak, is 7140 tons.
(5) after the notes solvent finishes, annotate aqueous solvent horizontal well closing well.
(6) horizontal production well in the injection-production well group begins cyclic preheat with vertical Injection Well; Preferably, the cyclic preheat mode adopts general downhole electric heating technology.
(7) average temperature of oil reservoir reaches 220 ℃ between the horizontal segment tiptoe of the vertical Injection Well of injection-production well group and horizontal production well, form after the thermal communication, inject continuously the oxygen-enriched air of 1000 side's oxygen contents 99% to vertical Injection Well, and adopt electric ignition mode in down-hole to light oil reservoir.
(8) vertical Injection Well injects air continuously, and air injection speed is 20000 side/skies, and horizontal production well is produced continuously; Preferably, the bottomhole injection pressure of vertical Injection Well is controlled at 4.2MPa, and the shaft bottom of horizontal production well produces the stream pressure-controlled at 3.7MPa, and both differences are controlled at 0.5MPa.
(9) content of oxygen in the continuous monitoring horizontal production well output gas, every two hours monitoring is once; Preferably, when oxygen content rose to 15%, the gas injection speed of vertical Injection Well reduced by 30%, and when oxygen content dropped to 5% in the output gas, the gas injection speed of vertical Injection Well improved 10%.
(10) produce end, close vertical Injection Well and horizontal production well.
The baked wheaten cake district band expansion at baked wheaten cake initial stage distribute, burn the baked wheaten cake district band expansion poly-with the solvent chamber and constantly of leading edge moveable oil band distribute and burn leading edge moveable oil band with the solvent chamber poly-and after baked wheaten cake district band expand distribution shown in Fig. 4 a, 4b, 4c.
Table 2 is the condition of production statistics of present embodiment.As shown in table 2, the conventional fireflood gravity drainage condition of production of existing well group in this heavy crude reservoir production zone, adopt the fireflood gravity drainage to produce the development scheme that finishes always, average each well group economical and effective production time is about 8.6 years, and final fireflood involves scope (swept volume) and is 310500m
3, peak value output 80t/d, ultimate recovery is about 40%; And the well group of the present embodiment in this heavy crude reservoir production zone adopts the inventive method, and on average each well group economical and effective production time is 12.9, and final fireflood involves scope (swept volume) and is 434700m
3, peak value output 116.8t/d, ultimate recovery are 58%.And in producing fire does not occur and alter, solvent and crude oil together are plucked out of, and by the common separated tower of ground prior art, can with separated from solvent and by the re-injection pipeline, realize the repeatedly recycling of solvent.
Table 2
Claims (10)
1. the method for the auxiliary fireflood gravity drainage exploitation of a solvent oil reservoir is characterized in that described method comprises the steps:
(1) horizontal production well and vertical Injection Well flooding pattern are set in the oil reservoir production zone: the same vertical section at same oil reservoir arranges horizontal production well and vertical Injection Well, forms an injection-production well group;
(2) between the adjacent injection-production well group of the oil reservoir of step (1), arrange and annotate the aqueous solvent horizontal well.
2. method according to claim 1 is characterized in that, described oil reservoir is heavy crude reservoir, the heavy crude reservoir of preferred viscosities 10000～1000000 centipoises; More preferably 15～30 meters of the oil reservoir individual layer effective thickness of oil reservoir.
3. method according to claim 1, it is characterized in that, 30～46 meters of the horizontal segment lateral separations of the horizontal production well of described adjacent injection-production well group, the horizontal segment of horizontal production well is apart from 1～2 meter of oil reservoir bottom, vertical Injection Well is positioned at horizontal production well horizontal segment tiptoe vertical direction top, 5～7 meters on the horizontal segment tiptoe of vertical Injection Well bottom hole spacing horizontal production well.
4. method according to claim 1, it is characterized in that, the horizontal segment of described notes aqueous solvent horizontal well is apart from 3～5 meters of tops of oil horizon, annotate the horizontal section length of aqueous solvent horizontal well and the horizontal section length of horizontal production well and equate that the horizontal production well horizontal segment of notes solvent levels well horizontal segment and both sides is parallel and distance is equal; Annotate the toe end of horizontal segment of aqueous solvent horizontal well and heel end and be in same plane with toe end and the heel end of the horizontal segment of horizontal production well respectively, described plane is perpendicular with the horizontal segment of the horizontal segment of annotating the aqueous solvent horizontal well and horizontal production well.
5. the described method of any one is characterized in that according to claim 1～4, and described method also comprises the steps:
A) annotate aqueous solvent horizontal well 3～5 cycles of steam soak;
B) after notes aqueous solvent horizontal well is handled up and finished, inject continuously solvent to annotating the aqueous solvent horizontal well, closing well after finishing;
C) horizontal production well in the injection-production well group begins cyclic preheat with vertical Injection Well, after forming thermal communication between the horizontal segment tiptoe of the vertical Injection Well of injection-production well group and horizontal production well, inject continuously the oxygen-enriched air of 300～1000 side's oxygen contents 90%～99% to vertical Injection Well, and light oil reservoir;
D) vertical Injection Well injects air continuously, and air injection speed is 3000～20000 side/skies, and horizontal production well is produced continuously; The content of oxygen in the continuous monitoring horizontal production well output gas.
6. method according to claim 5 is characterized in that, step a) in, the injection parameter of described steam soak is: cycle steam injection amount is 5～10 tons/meter, cycle is boiled in a covered pot over a slow fire 3～5 days well time, 30～45 days back production production times in cycle, cycle production-injection ratio 1.3～1.7.
7. method according to claim 5 is characterized in that, step b) in, described solvent is carbon number 3～8 with interior light paraffins solvent, is preferably one or more the mixing in propane, butane, pentane and the hexane; The solvent injection rate equals 1.2～1.5 times of last cycle lifting rate of steam soak.
8. method according to claim 5 is characterized in that, step c) after described thermal communication formed, the average temperature of oil reservoir reached 150～220 ℃ between the horizontal segment tiptoe of vertical Injection Well and horizontal production well.
9. method according to claim 5 is characterized in that, steps d) in inject continuously vertical Injection Well behind the air the shaft bottom of bottomhole injection pressure and the horizontal production well difference of producing the stream pressure be controlled at 0.2～0.5MPa.
10. method according to claim 5, it is characterized in that steps d) in when oxygen content rises to 10～15%, the gas injection speed of vertical Injection Well reduces by 10～30%, when oxygen content dropped to 0～5% in the output gas, the gas injection speed of vertical Injection Well improved 10～30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310027538.7A CN103089230B (en) | 2013-01-24 | 2013-01-24 | A kind of solvent assists fireflood gravity drainage to exploit the method for oil reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310027538.7A CN103089230B (en) | 2013-01-24 | 2013-01-24 | A kind of solvent assists fireflood gravity drainage to exploit the method for oil reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103089230A true CN103089230A (en) | 2013-05-08 |
| CN103089230B CN103089230B (en) | 2015-10-14 |
Family
ID=48202305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310027538.7A Active CN103089230B (en) | 2013-01-24 | 2013-01-24 | A kind of solvent assists fireflood gravity drainage to exploit the method for oil reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103089230B (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104405348A (en) * | 2014-10-27 | 2015-03-11 | 中国石油天然气股份有限公司 | Solvent reinforcement method for communicating between horizontal wells |
| CN104453805A (en) * | 2014-10-28 | 2015-03-25 | 中国石油天然气股份有限公司 | Rapid start method for heavy oil reservoir steam assisted gravity drainage |
| CN105518250A (en) * | 2013-07-05 | 2016-04-20 | 尼克森能源无限责任公司 | Solvent addition to improve efficiency of hydrocarbon production |
| CN105545274A (en) * | 2015-12-09 | 2016-05-04 | 中国石油天然气股份有限公司 | Well pattern and method for improving fire flooding effect of thick-layer heavy oil reservoir |
| CN105672977A (en) * | 2014-11-21 | 2016-06-15 | 中国石油天然气股份有限公司 | Horizontal well system and exploitation method for oil drainage of horizontal well |
| CN106150491A (en) * | 2016-07-08 | 2016-11-23 | 中国石油天然气股份有限公司 | The exploitation method of a kind of oil reservoir and device |
| CN106640002A (en) * | 2015-11-03 | 2017-05-10 | 中国石油天然气股份有限公司 | Exploitation method of thickened oil |
| CN106761631A (en) * | 2016-12-30 | 2017-05-31 | 中国石油天然气股份有限公司 | A kind of oil production method and well pattern |
| CN107806336A (en) * | 2016-09-09 | 2018-03-16 | 中国石油天然气股份有限公司 | The method that SAGD starts |
| CN108119113A (en) * | 2016-11-30 | 2018-06-05 | 中国石油天然气股份有限公司 | The method of heavy crude producing |
| CN111520118A (en) * | 2020-06-12 | 2020-08-11 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN112177580A (en) * | 2019-07-02 | 2021-01-05 | 中国石油天然气股份有限公司 | Fire flooding oil extraction method |
| CN114592847A (en) * | 2020-12-07 | 2022-06-07 | 中国石油化工股份有限公司 | Thick-layer oil reservoir heavy oil development method based on combustion-assisted gravity drainage |
| CN114909115A (en) * | 2021-02-08 | 2022-08-16 | 中国石油天然气股份有限公司 | Process method for improving SAGD (steam assisted gravity drainage) effect of vertical well auxiliary double horizontal wells |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001063092A1 (en) * | 2000-02-23 | 2001-08-30 | Japan Oil Development Co., Ltd. | Method of producing petroleum |
| EP1060326B1 (en) * | 1997-12-11 | 2003-04-02 | Alberta Research Council, Inc. | Oilfield in situ hydrocarbon upgrading process |
| US20070181299A1 (en) * | 2005-01-26 | 2007-08-09 | Nexen Inc. | Methods of Improving Heavy Oil Production |
| CN101427005A (en) * | 2006-02-27 | 2009-05-06 | 亚康科技股份有限公司 | Process for extracting liquid hydrocarbon from underground reservoir |
| CN102128020A (en) * | 2004-06-07 | 2011-07-20 | 阿克恩科技有限公司 | Oilfield enhanced in situ combustion process |
-
2013
- 2013-01-24 CN CN201310027538.7A patent/CN103089230B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1060326B1 (en) * | 1997-12-11 | 2003-04-02 | Alberta Research Council, Inc. | Oilfield in situ hydrocarbon upgrading process |
| WO2001063092A1 (en) * | 2000-02-23 | 2001-08-30 | Japan Oil Development Co., Ltd. | Method of producing petroleum |
| CN102128020A (en) * | 2004-06-07 | 2011-07-20 | 阿克恩科技有限公司 | Oilfield enhanced in situ combustion process |
| US20070181299A1 (en) * | 2005-01-26 | 2007-08-09 | Nexen Inc. | Methods of Improving Heavy Oil Production |
| CN101427005A (en) * | 2006-02-27 | 2009-05-06 | 亚康科技股份有限公司 | Process for extracting liquid hydrocarbon from underground reservoir |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105518250A (en) * | 2013-07-05 | 2016-04-20 | 尼克森能源无限责任公司 | Solvent addition to improve efficiency of hydrocarbon production |
| 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 |
| 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 |
| CN104405348B (en) * | 2014-10-27 | 2017-01-11 | 中国石油天然气股份有限公司 | Solvent reinforcement method for communicating between horizontal wells |
| CN104405348A (en) * | 2014-10-27 | 2015-03-11 | 中国石油天然气股份有限公司 | Solvent reinforcement method for communicating between horizontal wells |
| CN104453805A (en) * | 2014-10-28 | 2015-03-25 | 中国石油天然气股份有限公司 | Rapid start method for heavy oil reservoir steam assisted gravity drainage |
| CN105672977A (en) * | 2014-11-21 | 2016-06-15 | 中国石油天然气股份有限公司 | Horizontal well system and exploitation method for oil drainage of horizontal well |
| CN105672977B (en) * | 2014-11-21 | 2019-06-11 | 中国石油天然气股份有限公司 | A kind of recovery method of horizontal well system and horizontal well draining |
| CN106640002A (en) * | 2015-11-03 | 2017-05-10 | 中国石油天然气股份有限公司 | Exploitation method of thickened oil |
| CN105545274A (en) * | 2015-12-09 | 2016-05-04 | 中国石油天然气股份有限公司 | Well pattern and method for improving fire flooding effect of thick-layer heavy oil reservoir |
| CN106150491A (en) * | 2016-07-08 | 2016-11-23 | 中国石油天然气股份有限公司 | The exploitation method of a kind of oil reservoir and device |
| CN106150491B (en) * | 2016-07-08 | 2019-03-15 | 中国石油天然气股份有限公司 | A kind of exploitation method and device of oil reservoir |
| CN107806336A (en) * | 2016-09-09 | 2018-03-16 | 中国石油天然气股份有限公司 | The method that SAGD starts |
| CN108119113B (en) * | 2016-11-30 | 2020-04-10 | 中国石油天然气股份有限公司 | Method for exploiting thick oil |
| CN108119113A (en) * | 2016-11-30 | 2018-06-05 | 中国石油天然气股份有限公司 | The method of heavy crude producing |
| CN106761631A (en) * | 2016-12-30 | 2017-05-31 | 中国石油天然气股份有限公司 | A kind of oil production method and well pattern |
| CN106761631B (en) * | 2016-12-30 | 2019-11-08 | 中国石油天然气股份有限公司 | A kind of oil production method and well pattern |
| CN112177580A (en) * | 2019-07-02 | 2021-01-05 | 中国石油天然气股份有限公司 | Fire flooding oil extraction method |
| CN111520118A (en) * | 2020-06-12 | 2020-08-11 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN114592847A (en) * | 2020-12-07 | 2022-06-07 | 中国石油化工股份有限公司 | Thick-layer oil reservoir heavy oil development method based on combustion-assisted gravity drainage |
| CN114909115A (en) * | 2021-02-08 | 2022-08-16 | 中国石油天然气股份有限公司 | Process method for improving SAGD (steam assisted gravity drainage) effect of vertical well auxiliary double horizontal wells |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103089230B (en) | 2015-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103089230B (en) | A kind of solvent assists fireflood gravity drainage to exploit the method for oil reservoir | |
| CN102900415B (en) | Method for mining deep and ultra-deep thick oil pools by using double horizontal well fire flooding drainage | |
| CN102767356B (en) | Method for using combustion and vapor combination flooding to exploit thick oil | |
| CN102747997B (en) | Fire-flooding exploitation method used in later period of steam assisted gravity drainage (SAGD) of heavy oil reservoir | |
| CN101798915B (en) | Method for improving recovery ratio of thick-layer massive thickened oil by utilizing subsection fireflooding exploitation | |
| CN105971576B (en) | The method of horizontal well fireflood assisted gravity drainage pattern exploitation special thick oil, super-viscous oil | |
| CN102587880B (en) | Oil extraction method | |
| CN104265253B (en) | Method for exploiting heavy oil reservoir by adopting SAGD (Steam Assisted Gravity Drainage) | |
| CN202810813U (en) | Well pattern structure for using combustion and steam combination flooding to jointly exploit thick oil | |
| CN103244089B (en) | The exploitation method of microwave radiation technology solvent extraction viscous crude | |
| RU2539048C2 (en) | In-situ combustion method (versions) | |
| CN103939069A (en) | Steam-gas displacement and gravity oil drain composite exploiting method | |
| CN102359365B (en) | Method for extracting oil through injecting high temperature steam into oil layer to initiate hydrothermal exothermic | |
| CN106593397A (en) | Heavy oil reservoir exploitation method | |
| CN104196507A (en) | Fireflooding huff and puff and fireflooding linkage thickened oil exploitation method | |
| Wenlong et al. | Field control technologies of combustion assisted gravity drainage (CAGD) | |
| CN106593375A (en) | Hot exploitation method for exploiting gas-cap super-heavy oil reservoirs | |
| CA2871568C (en) | Waste heat recovery from depleted reservoir | |
| CN103161437A (en) | Fleeing sealing sand-prevention ignition method of fireflooding oil extraction | |
| CN203394482U (en) | Heavy oil exploiting device used for horizontal well | |
| CN102137986A (en) | A modified process for hydrocarbon recovery using in situ combustion | |
| CN104265258A (en) | Fracture-assisted combustion of oil in-situ stimulation thickened oil exploiting method | |
| CN106640012A (en) | Fireflooding oil-extracting method for exploiting super heavy oil reservoir with bottom water | |
| CA2824168A1 (en) | Process for the recovery of heavy oil and bitumen using in-situ combustion | |
| CN205743867U (en) | Horizontal row gas well is utilized to adjust the well pattern of fireflood assisted gravity drainage live wire form |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |