CN103089230B - A kind of solvent assists fireflood gravity drainage to exploit the method for oil reservoir - Google Patents
A kind of solvent assists fireflood gravity drainage to exploit the method for oil reservoir Download PDFInfo
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Abstract
The present invention relates to a kind of solvent assists fireflood gravity drainage to exploit the method for oil reservoir, described method comprises the steps: that (1) arranges horizontal production well and vertical injection wells flooding pattern in oil reservoir production zone: arrange horizontal production well and vertical injection wells at the same vertical section of same oil reservoir, forms an injection-production well group; (2) between the adjacent injection-production well group of the oil reservoir of step (1), note aqueous solvent horizontal well is set.Glutinous effect falls in the dissolving of solvent to crude oil, and the oil reservoir viscosity of injection-production well group horizontal production well flank significantly reduces, and effective production time is long, and recovery ratio is high; In addition, because horizontal segment flank solvent chamber is to the lateral traction effect of live wire, large quantity of air is expanded to flank with combustion zone, directly to scurry at the bottom of producing well thus the security risk occurred because this reducing air.
Description
Technical field
The invention relates to a kind of solvent assists fireflood gravity drainage to exploit the method for 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 disposes a bite horizontal production well and a bite vertical injection wells at the same vertical profile of same oil reservoir, the horizontal segment of horizontal production well is positioned at bottom oil reservoir, 1 ~ 2 meter, boundary at the bottom of distance oil reservoir, vertical injection wells is positioned at the vertical top of tiptoe of horizontal production well horizontal segment, 5 ~ 7 meters, the horizontal segment tiptoe of its vertical injection wells bottom hole spacing horizontal production well.In fireflood manufacturing process, first vertical injection wells and horizontal production well adopt the mode of steam soak or downhole electric heating to carry out cyclic preheat simultaneously, form thermal communication between vertical injection wells shaft bottom and the horizontal segment tiptoe of horizontal production well after, air ignition is injected from vertical injection wells, after lighting oil reservoir, vertical injection wells continues air injection, horizontal production well continuous production.There is vertical convective mass transfer in the crude oil that air heats due to Float upward function and baked wheaten cake, crude oil flows under the influence of gravity in the horizontal production well horizontal segment bottom oil reservoir, thus is plucked out of the ground.Laboratory experiment shows, 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 pilot test of Whitesands Project Areas, the basic limitation of THAI technology has following three to select: one is when the coke zone in oil reservoir baked wheaten cake process is thinner, time poor to the horizontal firing section closure of horizontal production well, the air that vertical injection wells injects easily enters in the horizontal segment of horizontal production well, fire is caused to alter, thus burn out horizontal segment screen casing, there is serious potential safety hazard; Two is the super-heavy oil deposits for viscosity too high (underground viscosity >1 1,000,000 centipoise), the resistance expanded to horizontal segment flank due to live wire is too large, combustion front is caused to continue to advance along horizontal segment, and the combustion range of flank is only 5 ~ 10 meters, the oil reservoir reserves between adjacent well group effectively cannot be employed; Three is because high Crude viscosity causes oil reservoir resistance large, in simple fireflood gravity drainage process, the moveable oil band formed 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 region that the air of average each well group involves, there is the crude oil of about 30% to be burnt, therefore greatly reduce recovery ratio and exploitation benefit.
Summary of the invention
One object of the present invention is to provide a kind of solvent to assist fireflood gravity drainage to exploit the method for oil reservoir.
Water horizontal well is disposed in oil reservoir middle and upper part in the middle of adjacent injection-production well group, before baked wheaten cake, this horizontal well carries out 3 ~ 5 cycles of steam soak, the vapor chamber taken on a certain scale, then inject the light solvent such as a certain amount of propane, butane, pentane or hexane to this horizontal well continuously and fill up vapor chamber, thus form two continuous print solvent chambeies respectively at the horizontal production well left and right flank of injection-production well group.In fireflood process, because glutinous effect falls in the dissolving of solvent to crude oil, the oil reservoir viscosity of injection-production well group horizontal production well flank significantly reduces, therefore in 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, and therefore fireflood impact scope is large, and effective production time is long; In addition, because solvent is to the extractive distillation effect of crude oil and deasphalting, be positioned at the moveable oil band scope burnt before leading edge coke zone comparatively large, only leave heavy asphalt and colloid and remain in oil reservoir and form coke zone, therefore few by the crude oil amount of burning in baked wheaten cake process, recovery ratio is high; In addition, because horizontal production well horizontal segment flank solvent chamber is to the lateral traction effect of live wire, large quantity of air is expanded to flank with combustion zone, directly to scurry at the bottom of producing well thus the security risk occurred because this reducing air.Mining site actual production Contrast on effect shows, solvent assists the fireflood impact scope of fireflood gravity drainage techniques to burn large 10 ~ 40% than conventional THAI, effective production time burns long 20 ~ 50% than conventional THAI, recovery ratio burns raising 10 ~ 45% than conventional THAI, and peak value output burns raising 15 ~ 46% than conventional THAI.
For reaching above-mentioned purpose, the invention provides a kind of solvent and assisting fireflood gravity drainage to exploit the method for oil reservoir: a kind of solvent assists fireflood gravity drainage to exploit the method for oil reservoir, and described method comprises the steps:
(1) horizontal production well and vertical injection wells flooding pattern are set in oil reservoir production zone: horizontal production well and vertical injection wells are set at the same vertical section of same oil reservoir, form an injection-production well group;
(2) between the adjacent injection-production well group of the oil reservoir of step (1), note aqueous solvent horizontal well is set.
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 the oil reservoir individual layer effective thickness 15 ~ 30 meters of oil reservoir.
In practice of construction, multiple injection-production well group composition flooding pattern can be set according to oil reservoir concrete condition, 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, pay more creative work without the need to those skilled in the art.
Wherein said note aqueous solvent horizontal well can adopt the pipe well of prior art structure, and those skilled in the art, according to record of the present invention, can select the pipe well of suitable prior art, such as is the common cutting seam sieve tube completion of prior art.
One skilled in the art will appreciate that this note aqueous solvent horizontal well must comprise the vertical section injecting solvent wherein.
According to method of the present invention, the horizontal segment lateral separation 30 ~ 46 meters of the horizontal production well of described adjacent injection-production well group, horizontal production well horizontal segment distance oil reservoir bottom 1 ~ 2 meter, vertical injection wells is positioned at above horizontal production well horizontal segment tiptoe vertical direction, 5 ~ 7 meters, the horizontal segment tiptoe of vertical injection wells bottom hole spacing horizontal production well.
According to method of the present invention, horizontal segment distance 3 ~ 5 meters, the top of oil horizon of described note aqueous solvent horizontal well, the horizontal section length of the horizontal section length of note aqueous solvent horizontal well and the horizontal production well of injection-production well group is equal, and the horizontal segment of note aqueous solvent horizontal well is parallel with the horizontal segment of the horizontal production well of the injection-production well group on its both sides and horizontal range is identical; The toe end of the horizontal segment of note aqueous solvent horizontal well 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 described plane is perpendicular with the horizontal segment of the horizontal segment of note aqueous solvent horizontal well and the horizontal production well of injection-production well group.
The toe end of the horizontal segment of note 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 toe end of horizontal segment of note aqueous solvent horizontal well and the horizontal segment of the horizontal production well of injection-production well group is in same plane, and the heel end of the heel end of horizontal segment of note aqueous solvent horizontal well and the horizontal segment of the horizontal production well of injection-production well group is in same plane; Or
The heel end of the toe end of horizontal segment of note aqueous solvent horizontal well and the horizontal segment of the horizontal production well of injection-production well group is in same plane, and the toe end of the heel end of horizontal segment of note aqueous solvent horizontal well and the horizontal segment of the horizontal production well of injection-production well group is in same plane.
According to method of the present invention, described method also comprises the steps:
A) aqueous solvent horizontal well 3 ~ 5 cycles of steam soak are noted;
B), after note aqueous solvent horizontal well is handled up and terminated, inject solvent continuously to note aqueous solvent horizontal well, terminate rear closing well;
C) horizontal production well in injection-production well group and vertical injection wells start cyclic preheat, form thermal communication between the vertical injection wells and the horizontal segment tiptoe of horizontal production well of injection-production well group after, inject the oxygen-enriched air of 300 ~ 1000 side's oxygen contents 90% ~ 99% to vertical injection wells continuously, and light oil reservoir;
D) vertical injection wells injects air continuously, and air injection speed is 3000 ~ 20000 sides/sky, horizontal production well continuous seepage; The content of oxygen in continuous level monitoring producing well output gas.
After production terminates, close vertical injection wells and horizontal production well.
According to method of the present invention, in step a), described steam soak can be conventionally any cyclic steam stimulation method operation, the preferred injection parameter of the present invention is: cyclic steam injection rate is 5 ~ 10 tons/unit level segment length (rice), cycle boils 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 is less than 1 ton/day, proceed to the lower whorl cycle.
According to method of the present invention, in step b), described solvent be carbon number 3 ~ 8 light paraffins solvent;
Described light paraffins is this area generic term, all clear definition knowing described light paraffins of those skilled in the art, and the present invention is preferably one or more the mixture in propane, butane, pentane and hexane; 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 described in step c), thermal communication is formed, between the horizontal segment tiptoe of vertical injection wells and horizontal production well, the average temperature of oil reservoir reaches 150 ~ 220 DEG C.
In above-mentioned exploitation method provided by the invention, preferably, in step c), cyclic preheat mode can adopt downhole electric heating or inject the modes such as vapor recycle preheating;
Wherein, downhole electric heating and steam injected cycle preheating are this area current techique.
The cyclic preheat that wherein the present invention preferably adopts is: stretch into the long oil pipe steam injection of horizontal production well horizontal segment tiptoe, stretch into the short oil pipe back production of horizontal segment heel; Between the horizontal segment tiptoe being preheating to vertical injection wells and horizontal production well, the average temperature of oil reservoir reaches 150 ~ 220 DEG C.
In above-mentioned exploitation method provided by the invention, in step c), described in light oil reservoir mode any in prior art can be adopted to carry out, preferably, described in light oil reservoir and can adopt down-hole electric ignition mode;
Sparking mode can be for example the spontaneous ignition that injection slug oxygen enrichment (oxygen content 90% ~ 99%) enters oil reservoir, after oil reservoir is lighted, is converted to and injects air continuously;
According to method of the present invention, after continuously injecting air in step d), the bottomhole injection pressure of vertical injection wells and the shaft bottom of horizontal production well produce and flow the difference of pressing and control at 0.2 ~ 0.5MPa, and air injection speed is 3000 ~ 20000 sides/sky.
According to method of the present invention, in step d) when oxygen content rises to 10 ~ 15%, the gas injection speed of vertical injection wells reduces by 10 ~ 30%, and when in output gas, oxygen content drops to 0 ~ 5%, the gas injection speed of vertical injection wells improves 10 ~ 30%.
Mining site actual production effect shows, solvent provided by the present invention assists fireflood gravity drainage exploitation oil reservoir method to have following technique effect:
(1) exploitation method provided by the present invention adopts solvent to assist fireflood gravity drainage to develop, note aqueous solvent horizontal well is flatly disposed in oil reservoir middle and upper part in the middle of adjacent injection-production well group, vapor chamber is produced by first steam soak, then the mode that solvent forms solvent chamber is injected, the continuous solvent chamber isometric with noting solvent levels well horizontal section length is all defined at the flank of injection-production well group horizontal segment, therefore in whole baked wheaten cake process, solvent all can play long-acting auxiliary oil drainage effect, terminates until produce.
(2) in fireflood process, the crude oil of solvent in solvent chamber constantly and outside solvent chamber carries out molecular diffusion and convection current, thus play glutinous effect is fallen to the high-efficiency dissolution of crude oil, this makes the oil reservoir viscosity of injection-production well group horizontal production well flank significantly reduce, therefore in 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 impact scope burns large 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, be positioned at and burn crude oil before leading edge coke zone after the deasphalting of solvent, lightweight in crude oil is extracted out with middle matter component and flows downward before coke zone with solvent, the moveable oil band that forming range is larger, and there is higher fluid ability, only leave heavy asphalt and colloid to remain in oil reservoir and form coke zone, therefore few by the crude oil amount of burning in baked wheaten cake process, recovery ratio burns raising 10 ~ 45% than conventional THAI.
(4) because the crude oil flow ability near the solvent chamber of the horizontal segment flank of injection-production well group horizontal production well is high, the flow resistance that injection air enters this region is little, to creating effective lateral traction effect in live wire progradation, large quantity of air is expanded to flank with combustion zone, combustion front expands, peak value output burns raising 15 ~ 46% than conventional THAI, also reduces air and directly to scurry at the bottom of producing well thus the security risk occurred.
(5) be plucked out of because solvent flows at the bottom of producing well with crude oil in baked wheaten cake process, therefore solvent can reuse, good in economic efficiency.
Accompanying drawing explanation
Fig. 1 assists the well spacing schematic diagram of fireflood gravity drainage production of heavy oil reservoir method for solvent that embodiment 1,2 provides;
Fig. 2 is the front well location sectional drawing of Fig. 1, and wherein section perpendicular is in note solvent levels well horizontal segment, and through vertical injection wells;
Fig. 3 is the side well location sectional drawing of Fig. 1, and its midship section is parallel to note solvent levels well horizontal segment and through the well location sectional drawing of vertical injection wells;
Fig. 4 a is the baked wheaten cake zone expansion distribution schematic diagram at the baked wheaten cake initial stage of embodiment 1,2 method;
Fig. 4 b is that the baked wheaten cake leading edge moveable oil band of embodiment 1,2 method and the baked wheaten cake zone in solvent chamber coalescence moment expand distribution schematic diagram;
Fig. 4 c is that the baked wheaten cake zone after the baked wheaten cake leading edge moveable oil band of embodiment 1,2 method and solvent chamber coalescence expands distribution schematic diagram.
Main Reference label declaration:
Note aqueous solvent horizontal well 11/12/13 horizontal production well 21/22 vertical injection wells 31/32
Solvent chamber 41/42 air chamber 51 coke zone 52
Moveable oil band 53 moveable oil stream 61
Detailed description of the invention
Describe the beneficial effect of implementation process of the present invention and generation below by way of specific embodiment in detail, be intended to help reader to understand essence of the present invention and feature better, not as can the restriction of practical range to this case.
Embodiment 1
The 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 DEG C; Crude viscosity is high, and under reservoir temperature, degassed crude viscosity is 1,000,000 centipoises, the effectively average 15m of core intersection.
The solvent that the present embodiment provides assists fireflood gravity drainage production of heavy oil reservoir method to comprise following concrete steps:
(1) first adjacent two pairs of horizontal production well and vertical injection wells flooding pattern are set in this heavy crude reservoir production zone, specifically, dispose a bite horizontal production well and a bite vertical injection wells at the same vertical profile of same oil reservoir, form an injection-production well group; Preferably, the horizontal segment lateral separation 30 meters of horizontal production well in adjacent two injection-production well groups, the horizontal segment of horizontal production well is positioned at bottom oil reservoir, 1 meter, boundary at the bottom of distance oil reservoir, the horizontal section length of horizontal production well 400 meters, vertical injection wells is positioned at the vertical top of tiptoe of horizontal production well horizontal segment, 5 meters, the horizontal segment tiptoe of its completion bottom hole spacing horizontal production well.
(2) in the middle of adjacent injection-production well group, note aqueous solvent horizontal well is flatly disposed; Preferably, the horizontal segment of note aqueous solvent horizontal well is positioned at oil reservoir middle and upper part, distance 3 meters, oil reservoir top circle, the horizontal section length of note aqueous solvent horizontal well is equal with the horizontal section length of horizontal production well in injection-production well group, be 400 meters, lateral separation 15 meters between the horizontal segment of the horizontal production well in the horizontal segment of note aqueous solvent horizontal well and adjacent injection-production well group.
The schematic diagram of above-mentioned horizontal flooding pattern as shown in Figure 1, Figure 2, Figure 3 shows.
(3) note aqueous solvent horizontal well to start continuous steam and handle 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, 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 boils 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 note aqueous solvent horizontal well is handled up and terminated, in note aqueous solvent horizontal well, inject solvent continuously, preferably, described solvent is the mixture that propane and butane configure according to mass percent 1:1; Solvent injection rate equals 1.2 times of last cycle lifting rate of steam soak, is 5040 tons.
(5) after note solvent terminates, note aqueous solvent horizontal well closing well.
(6) horizontal production well in injection-production well group and vertical injection wells start cyclic preheat; Preferably, cyclic preheat mode adopts general downhole electric heating technology.
(7) between the vertical injection wells of injection-production well group and the horizontal segment tiptoe of horizontal production well, the average temperature of oil reservoir reaches 150 DEG C, after forming thermal communication, inject the oxygen-enriched air of 300 side's oxygen contents 90% to vertical injection wells continuously, and adopt down-hole electric ignition mode to light oil reservoir.
(8) vertical injection wells injects air continuously, and air injection speed is 3000 sides/sky, horizontal production well continuous seepage.Preferably, the bottomhole injection pressure of vertical injection wells controls at 4.4MPa, and the shaft bottom of horizontal production well produces stream pressure-controlled at 4.2MPa, and both differences control at 0.2MPa.
(9) the continuous content of oxygen in level monitoring producing well output gas, every two hours monitors once.Preferably, when oxygen content rises to 10%, the gas injection speed of vertical injection wells reduces by 10%, and when in output gas, oxygen content drops to 0%, the gas injection speed of vertical injection wells improves 30%.
(10) produce end, close vertical injection wells and horizontal production well.
The baked wheaten cake initial stage burns zone expansion distribution, burn leading edge moveable oil band and the baked wheaten cake zone in solvent chamber coalescence moment expands the baked wheaten cake zone after distributing and burn leading edge moveable oil band and solvent chamber coalescence and expands and distribute as shown in Fig. 4 a, 4b, 4c.
Table 1 is the condition of production statistics of the 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 fireflood gravity drainage to produce the development scheme terminated, the economical and effective production time is about 6.1 years, and final fireflood impact scope (swept volume) is 90000m always
3, peak value output 40t/d, ultimate recovery is about 29%, the closing well due to horizontal production well too early has channeling; And the well group of the present embodiment in this heavy crude reservoir production zone adopts the inventive method economical and effective production time to be 7.32, final fireflood impact scope (swept volume) is 99000m
3, peak value output 46t/d, ultimate recovery is 39%, and recovery ratio improves 10 percentage points than the exploitation of conventional steam assisted gravity drainage techniques.And fire does not occur alter in producing, solvent and crude oil are together plucked out of, and by the common separated tower of ground prior art, separated from solvent can be passed through re-injection pipeline, realize the repeatedly recycling of solvent.
Table 1
Embodiment 2
The present embodiment provides a kind of solvent to assist fireflood gravity drainage production of heavy oil reservoir method, and the average buried depth of major oil reservoir of this heavy crude reservoir is 400m, and initial reservoir pressure is 3.7MPa, and the original reservoir temperature is 23 DEG C; Under reservoir temperature, degassed crude viscosity is 10,000 centipoises, the effectively average 30m of core intersection.
The solvent that the present embodiment provides assists fireflood gravity drainage production of heavy oil reservoir method to comprise following concrete steps:
(1) first adjacent two pairs of horizontal production well and vertical injection wells flooding pattern are set in this heavy crude reservoir production zone, specifically, dispose a bite horizontal production well and a bite vertical injection wells at the same vertical profile of same oil reservoir, form an injection-production well group; Preferably, the horizontal segment lateral separation 46 meters of horizontal production well in adjacent two injection-production well groups, the horizontal segment of horizontal production well is positioned at bottom oil reservoir, 2 meters, boundary at the bottom of distance oil reservoir, the horizontal section length of horizontal production well 400 meters, vertical injection wells is positioned at the vertical top of tiptoe of horizontal production well horizontal segment, 7 meters, the horizontal segment tiptoe of its completion bottom hole spacing horizontal production well.
(2) in the middle of adjacent injection-production well group, note aqueous solvent horizontal well is flatly disposed.Preferably, the horizontal segment of note aqueous solvent horizontal well is positioned at oil reservoir middle and upper part, distance 5 meters, oil reservoir top circle, the horizontal section length of note aqueous solvent horizontal well is equal with the horizontal section length of horizontal production well in injection-production well group, be 400 meters, lateral separation 23 meters between the horizontal segment of the horizontal production well in the horizontal segment of note aqueous solvent horizontal well and adjacent injection-production well group.
The schematic diagram of above-mentioned horizontal flooding pattern as shown in Figure 1, Figure 2, Figure 3 shows.
(3) note aqueous solvent horizontal well to start continuous steam and handle 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, steam injection amount was 6 tons/unit level segment length (rice), was 2400 tons; Three ~ period 5 steam injection amount is 7 tons/unit level segment length (rice), is 2800 tons; Cycle boils 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 note aqueous solvent horizontal well is handled up and terminated, in note aqueous solvent horizontal well, solvent is injected continuously; Preferably, described solvent is the mixture that pentane and hexane configure according to mass percent 1:1; Solvent injection rate equals 1.5 times of last cycle lifting rate of steam soak, is 7140 tons.
(5) after note solvent terminates, note aqueous solvent horizontal well closing well.
(6) horizontal production well in injection-production well group and vertical injection wells start cyclic preheat; Preferably, cyclic preheat mode adopts general downhole electric heating technology.
(7) between the vertical injection wells of injection-production well group and the horizontal segment tiptoe of horizontal production well, the average temperature of oil reservoir reaches 220 DEG C, after forming thermal communication, inject the oxygen-enriched air of 1000 side's oxygen contents 99% to vertical injection wells continuously, and adopt down-hole electric ignition mode to light oil reservoir.
(8) vertical injection wells injects air continuously, and air injection speed is 20000 sides/sky, horizontal production well continuous seepage; Preferably, the bottomhole injection pressure of vertical injection wells controls at 4.2MPa, and the shaft bottom of horizontal production well produces stream pressure-controlled at 3.7MPa, and both differences control at 0.5MPa.
(9) the continuous content of oxygen in level monitoring producing well output gas, every two hours monitors once; Preferably, when oxygen content rises to 15%, the gas injection speed of vertical injection wells reduces by 30%, and when in output gas, oxygen content drops to 5%, the gas injection speed of vertical injection wells improves 10%.
(10) produce end, close vertical injection wells and horizontal production well.
The baked wheaten cake zone expansion distribution at baked wheaten cake initial stage, burn leading edge moveable oil band and the baked wheaten cake zone in solvent chamber coalescence moment and expand the baked wheaten cake zone after distributing and burn leading edge moveable oil band and solvent chamber coalescence and expand and distribute as shown in Fig. 4 a, 4b, 4c.
Table 2 is the condition of production statistics of the 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 fireflood gravity drainage to produce the development scheme terminated always, average each well group economical and effective production time is about 8.6 years, and final fireflood impact scope (swept volume) 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, average each well group economical and effective production time is 12.9, and final fireflood impact scope (swept volume) is 434700m
3, peak value output 116.8t/d, ultimate recovery is 58%.And fire does not occur alter in producing, solvent and crude oil are together plucked out of, and by the common separated tower of ground prior art, separated from solvent can be passed through re-injection pipeline, realize the repeatedly recycling of solvent.
Table 2
Claims (12)
1. solvent assists fireflood gravity drainage to exploit a method for oil reservoir, and it is characterized in that, described method comprises the steps:
(1) horizontal production well and vertical injection wells flooding pattern are set in oil reservoir production zone: horizontal production well and vertical injection wells are set at the same vertical section of same oil reservoir, form an injection-production well group;
(2) between the adjacent injection-production well group of the oil reservoir of step (1), note aqueous solvent horizontal well is set;
Described method also comprises the steps:
A) aqueous solvent horizontal well 3 ~ 5 cycles of steam soak are noted;
B), after note aqueous solvent horizontal well is handled up and terminated, inject solvent continuously to note aqueous solvent horizontal well, terminate rear closing well;
C) horizontal production well in injection-production well group and vertical injection wells start cyclic preheat, form thermal communication between the vertical injection wells and the horizontal segment tiptoe of horizontal production well of injection-production well group after, inject the oxygen-enriched air of 300 ~ 1000 side's oxygen contents 90% ~ 99% to vertical injection wells continuously, and light oil reservoir;
D) vertical injection wells injects air continuously, and air injection speed is 3000 ~ 20000 sides/sky, horizontal production well continuous seepage; The content of oxygen in continuous level monitoring producing well output gas.
2. method according to claim 1, is characterized in that, described oil reservoir is heavy crude reservoir.
3. method according to claim 2, is characterized in that, described oil reservoir is the heavy crude reservoir of viscosity 10000 ~ 1000000 centipoise.
4. method according to claim 2, is characterized in that, the oil reservoir individual layer effective thickness 15 ~ 30 meters of described oil reservoir.
5. method according to claim 1, it is characterized in that, the horizontal segment lateral separation 30 ~ 46 meters of the horizontal production well of described adjacent injection-production well group, horizontal production well horizontal segment distance oil reservoir bottom 1 ~ 2 meter, vertical injection wells is positioned at above horizontal production well horizontal segment tiptoe vertical direction, 5 ~ 7 meters, the horizontal segment tiptoe of vertical injection wells bottom hole spacing horizontal production well.
6. method according to claim 1, it is characterized in that, horizontal segment distance 3 ~ 5 meters, the top of oil horizon of described note aqueous solvent horizontal well, the horizontal section length of note aqueous solvent horizontal well is equal with the horizontal section length of horizontal production well, and note solvent levels well horizontal segment is parallel with the horizontal production well horizontal segment of both sides and apart from equal; The toe end of the horizontal segment of note aqueous solvent horizontal well and heel end are in same plane with the toe end of the horizontal segment of horizontal production well and heel end respectively, described plane and the horizontal segment of note aqueous solvent horizontal well and the horizontal segment of horizontal production well perpendicular.
7. method according to claim 1, is characterized in that, step a) in, the injection parameter of described steam soak is: cyclic steam injection rate is 5 ~ 10 tons/meter, cycle boils 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.
8. method according to claim 1, is characterized in that, step b) in, described solvent is the light paraffins solvent of carbon number within 3 ~ 8; Solvent injection rate equals 1.2 ~ 1.5 times of last cycle lifting rate of steam soak.
9. method according to claim 8, is characterized in that, step b) in, described solvent is the mixing of one or more in propane, butane, pentane and hexane.
10. method according to claim 1, is characterized in that, step c) after described thermal communication formed, between the horizontal segment tiptoe of vertical injection wells and horizontal production well, the average temperature of oil reservoir reaches 150 ~ 220 DEG C.
11. methods according to claim 1, is characterized in that, steps d) in continuously inject air after the bottomhole injection pressure of vertical injection wells and the shaft bottom of horizontal production well produce and flow the difference of pressing and control at 0.2 ~ 0.5MPa.
12. methods according to claim 1, it is characterized in that, steps d) in when oxygen content rises to 10 ~ 15%, the gas injection speed of vertical injection wells reduces by 10 ~ 30%, when in output gas, oxygen content drops to 0 ~ 5%, the gas injection speed of vertical injection wells improves 10 ~ 30%.
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| CA2917263C (en) * | 2013-07-05 | 2021-12-14 | Nexen Energy Ulc | Solvent addition to improve efficiency of hydrocarbon production |
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