CN105545274A - Well pattern and method for improving fire flooding effect of thick-layer heavy oil reservoir - Google Patents
Well pattern and method for improving fire flooding effect of thick-layer heavy oil reservoir Download PDFInfo
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- CN105545274A CN105545274A CN201510900852.0A CN201510900852A CN105545274A CN 105545274 A CN105545274 A CN 105545274A CN 201510900852 A CN201510900852 A CN 201510900852A CN 105545274 A CN105545274 A CN 105545274A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
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Abstract
The invention provides a well pattern and a method for improving fire flooding effect of a thick-layer heavy oil reservoir. The well pattern is disposed on an oil reservoir whose geological structure is a uniclinal structure. The well pattern is characterized in that the well pattern comprises a fire well row and at least a row of oil well. The fire well row is on the high part of the uniclinal structure. The fire wells in the fire well row are disposed along the high part of the uniclinal structure in sequence. The oil well rows are in the uniclinal structure, and are below the fire well row, and are arranged along a downdip direction of the uniclinal structure in sequence. The two adjacent well rows are arranged in parallel. The invention also provides a method for improving fire flooding effect of a thick-layer heavy oil reservoir. The method comprises: injecting gas to the fire well on the high part of the oil reservoir structure, igniting an ignition layer section, start fire flooding oil extraction; and extracting oil from the oil well on the downdip direction. The technical scheme can fully use altitude differences of the geological structure of the thick-layer heavy oil reservoir to achieve an objective of gravity drainage.
Description
Technical field
The present invention relates to a kind of well pattern and the method that improve thick-layer heavy crude reservoir fireflood effect, belong to technical field of petroleum extraction.
Background technology
Combustion in situ is a kind of thermal process improving oil recovery factor, its cost is low, less energy consumption, oil displacement efficiency are high, wide adaptability, have a extensive future, and crude oil upgrading can be realized, but its mechanism of oil displacement is complicated, there is the multiple driving mechanisms such as steam flooding, hot water flooding, flue gas flooding, regulate and control difficulty in implementation process large, cause on-the-spot success rate low.It is successfully developed oil reservoir and belongs to thin layer reservoir more, and carrying out fireflood to the thick massive inspissated pool of similar Gaosheng oil field is once brand-new exploration and practice.For the high 3618 blocks of lotus flower oil reservoirs in Liaohe Faulted Depression basin promotion area, this block oil area is 1.1Km
2, petroleum-in-place is 1069 × 10
4t, this block is the monoclinal structure oil reservoir without pneumatic jack, lower bottomless water on, and its monocline inclination angle is 15-20 °, and deeply buried reservoir, thickness are large but distribution is stable, reservoir properties is good, average pore is 23%, and mean permeability is 2D, but sorting is poor, maximum gravel footpath is 10cm, be generally 0.2-1cm, sorting coefficient is 2.09, and non-homogeneity is strong.
This block dropped into exploitation in 1986, and development scheme is steam soak, experienced by twice well pattern entirety encryption (encrypting 105m by 210m) in development process, steam soak development phase block peak period year produce oil reach 13.9 × 10
4t, along with completing of twice encrypted work, block strata pressure significantly declines, and production per cycle exponentially rule successively decreases, and block output is to decline 1 × 10 every year
4-2 × 10
4the speed sharply atrophy of t, natural declining rate is up to more than 35%, and block yearly rate-oil production drops to only 4.0 × 10
4t.
Because remaining oil a large amount of between steam soak development effectiveness in latter stage variation well cannot be employed, within 2008, proceed to fireflood exploitation pilot test, and the scale that progressively expands reaches 18 current well groups, fireflood control reserve has accounted for 52% of block oil in place.Since fireflood is developed 5 years, trial zone production effect is poor, does not reach schematic design index all the time.Main manifestations is that fireflood takes effect slowly, and the well production that takes effect is low, and has channeling is frequent, the well production that takes effect instability, and regulation and control difficulty is large.By to the tight tracking of fireflood pilot wellgroup and research, analyze Problems existing, think the cause influence fireflood development effectiveness of following several respects:
1) flooding pattern design is unreasonable: dispose ranks at monoclinal structure waist and drive well array, and cause updip direction has channeling serious, serious interference between two well arrays, air utilization ratio is low, and fireflood takes effect slowly;
2) to adopt the design of layer position unreasonable for note: gas well igniting interval is middle part or top, and the full well section of oil well is produced, and configuration relation cannot reach gravity drainage object;
3) control technique is unreasonable: lack correct understanding to fireflood gravity drainage stimulation machanism, live wire leading edge locus is lacked and accurately judges, the auxiliary soaking taking longitudinal large well section on a large scale in plane draws effect measure, serious to established oily wall destruction, cause and can not form stable displacement;
4) gas injection speed is low: due to above well network design, the design of layer position, has channeling will certainly be caused serious, scene haves no alternative but take the scheme reducing gas injection speed, causes live wire leading edge can not remain stable and promotes.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of well pattern and the method that improve thick-layer heavy crude reservoir fireflood effect, the method can make full use of the geological structure discrepancy in elevation of thick-layer heavy crude reservoir, reaches the object of gravity drainage; Meanwhile, in fireflood process, efficiently solve the problem that the updip direction has channeling that exists in prior art is serious, effectively can utilize air, improve fireflood effect.
For achieving the above object, the invention provides a kind of well pattern improving thick-layer heavy crude reservoir fireflood effect, geological structure face and the horizontal plane of described thick-layer heavy crude reservoir form inclination angle, described well net deployment, on the geological structure face of described oil reservoir, is characterized in that: described well pattern comprises a line gas well row and at least a line oil-well drainage;
Described gas well ranking is in the high-order bit in described geological structure face, gas well in this gas well row disposes successively along the high-order bit in geological structure face, the high-order bit that gas well row is deployed in the geological structure face of oil reservoir can be made full use of the geological structure discrepancy in elevation, reach the object of gravity drainage;
Described oil-well drainage is arranged in the below of the relatively described gas well row of monoclinal structure, and the downdip direction along described geological structure face sets gradually;
Adjacent rows well array be arranged in parallel.
In above-mentioned well pattern, preferably, the geological structure of described thick-layer heavy crude reservoir is monoclinal structure; More preferably, the high-order bit in described geological structure face is that (such as 3618 pieces of pilot test districts are a monoclinal structure oil reservoir for the highest point in geological structure face, inclination angle is 15-20 °, and its similar band in structure top, carries out linear deployment by gas well along this band during deployment)
Prior art deploys two row's gas wells (as shown in Figure 1) at the waist of 3618 pieces, scheme of the prior art is adopted to there is a lot of drawback in fireflood process, the advantage of gravity drainage can not be given full play to, and adopt technical scheme provided by the invention, gas well is deployed in the high-order bit of oil reservoir, and only dispose a line gas well row, avoid well pattern of the prior art when carrying out fireflood on the one hand, downdip direction second row gas well row causes interference to the fireflood effect of updip direction first row gas well, the object that structure difference reaches gravity drainage can be made full use of on the other hand, make fireflood better effects if.
In above-mentioned well pattern, preferably, the plane well spacing in described gas well row between adjacent two gas wells is 50-75m; Be preferably 50m.
In above-mentioned well pattern, preferably, the plane array pitch between described gas well row and adjacent oil-well drainage is≤105m.
Well spacing and well array distance are arranged in above-mentioned number range by the present invention, can ensure that, in fireflood process, fireflood leading edge is evenly pushed ahead.
In above-mentioned well pattern, preferably, the plane well spacing in described every a line oil-well drainage between adjacent two oil wells is 75-105m.
In above-mentioned well pattern, preferably, in described every a line oil-well drainage the quantity of oil well arrange with described gas well in the quantity of gas well identical.
In above-mentioned well pattern, preferably, ignition layer section of described gas well is positioned at the upper area of oil reservoir; More preferably, described upper area is the region downward along top of oil horizon, and the thickness in this region accounts for 1/4 of whole core intersection.
In above-mentioned well pattern, preferably, the producing well section of described oil well is positioned at the lower area of oil reservoir; More preferably, described lower area is region upwards bottom oil reservoir, and the thickness in this region accounts for 3/4 of whole core intersection.
In above-mentioned well pattern, preferably, described oil well inside is provided with igniting interval, and this ignition layer section is positioned at the upper area along oil reservoir; More preferably, described upper area is the region downward along top of oil horizon, and the thickness in this region accounts for 1/4 of whole core intersection.
Adopt technique scheme design point fire bed section and producing well section, injection-production well section can be made longitudinally to stagger, make full use of the object that the structure discrepancy in elevation reaches the increasing oil that takes effect.
Present invention also offers and a kind ofly utilize above-mentioned well pattern to carry out the method for fireflood to thick-layer heavy crude reservoir, wherein,
When the line number of well pattern moderate heat well array and oil-well drainage is respectively 1, the method comprises the following steps:
A1, to be positioned at reservoir geology structural plane high-order bit the first row gas well row gas well carry out gas injection, firing point fire bed section, start fire flood;
B1, the oil well of the first row oil-well drainage being positioned at the first row gas well row downdip direction to be recovered the oil, complete fire flood;
When the line number of well pattern moderate heat well array is 1, during line number >=2 of oil-well drainage, the method comprises the following steps:
A2, to be positioned at reservoir geology structural plane high-order bit the first row gas well row carry out gas injection, light the igniting interval in gas well, start fire flood;
B2, when fireflood leading edge move to be positioned at the first row gas well row downdip direction the first row oil-well drainage time, after oil well in described oil-well drainage is recovered the oil, to described oil well gas injection, and firing point fire bed section, and closing well or shutoff are carried out to the gas well in described the first row gas well row;
C2, the oil well of the second row oil-well drainage being positioned at above-mentioned the first row oil-well drainage downdip direction to be recovered the oil;
D2, setting (on oil reservoir, the line number of well array can be arranged according to the size of the structure of oil reservoir and oil area) according to oil-well drainage line number on reservoir geology structural plane, according to the operating process of step B2-C2, guide fireflood leading edge along the downdip direction linear advancement of reservoir geology structural plane, arranged by the first row gas well and be advanced to the first row oil-well drainage, again by the first row oil-well drainage iterative method to n-th line oil-well drainage, complete fire flood;
Preferably, in fireflood process, when carrying out gas injection, control gas injection speed, to control the fltting speed of fireflood leading edge for 4-15cm/d is (for fireflood viscous crude, keep the fltting speed of fireflood leading edge in above-mentioned scope, fireflood can be made to carry out under the high-temp combustion pattern of high displacement efficiency).
Above-mentioned fireflood method can guide fireflood leading edge evenly to advance along the downdip direction of reservoir geology structural plane, solve the problem that in fireflood process, has channeling is serious, and air utilization ratio is high, fireflood instant effect.
In the above-mentioned methods, preferably, in fireflood process, the fltting speed controlling fireflood leading edge is 8cm/d.
In the above-mentioned methods, preferably, the method is also included in fireflood process the step that fireflood leading edge is administered; More preferably, describedly improvement is carried out to fireflood leading edge comprise: the oil well low to the degree that takes effect in fireflood leading edge and/or the low region of well control degree, select its degree of porosity is high, permeability is high interval to carry out steam injection and draw effect; Wherein, described in the low oil well of degree that takes effect be daily gas <1000 side and the oil well of day production fluid <3t, the region that described well control degree is low is the region of the well spacing >105m of adjacent two oil wells in plane; Further preferably, described steam injection is drawn effect and is comprised the following steps: propose down-hole oil production tubing string; Lower steam injection string carries out steam injection, stewing well; Oil pumping is produced, and proposes steam injection string, lower pump;
Draw in effect process in gas injection, when lower tubular column carries out steam injection, Stimulated Wells Gas Injection (injection pressure, steam quality, steam injection rate, cyclic steam injection volume and steam injection intensity etc.), can design according to the temperature on the thickness of actual oil reservoir and stratum, under normal circumstances, at prime stratum temperature i.e. 60 DEG C of situations, can design by first run steam injection every rice bran oil layer 55 side quantity of steam, often increase by a round, every meter of steam injection amount increases by 5 sides later; Under formation temperature has risen and is namely greater than 60 DEG C of situations, steam injection amount can the viscosity of based on crude design.
In the above-mentioned methods, preferably, when the region low to well control degree, select its degree of porosity is high, permeability is high interval to carry out steam injection when drawing effect, after proposition down-hole oil production tubing string, lower steam injection string carries out steam injection, before stewing well, also comprise the step of the target zone of fireflood being carried out to perforation.
Beneficial effect of the present invention:
1) technical scheme provided by the invention can make full use of the geological structure discrepancy in elevation of thick-layer heavy crude reservoir, reaches the object of gravity drainage;
2) technical scheme provided by the invention can keep smooth combustion in fireflood process, guides fireflood leading edge evenly to advance along the downdip direction of monoclinal structure; Meanwhile, in fireflood process, efficiently solve the problem that the updip direction has channeling that exists in prior art is serious, effectively can utilize air, improve fireflood effect.
Accompanying drawing explanation
Fig. 1 is the well pattern layout in comparative example in 3618 pieces of pilot test districts;
Fig. 2 is well pattern layout new in 3618 pieces of pilot test districts in embodiment 1;
Fig. 3 is the position view of embodiment 1 moderate heat well point fire bed section and oil well production well section;
Fig. 4 is the well pattern layout after rectifying and improving for the well pattern in 3618 pieces of pilot test districts in comparative example.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Following embodiment is with Liaohe Faulted Depression basin promotion 3618 blocks of lotus flower oil reservoirs for objective for implementation, and carried out regulating and controlling test to Liaohe Faulted Depression basin promotion 3618 blocks of lotus flower oil reservoirs (i.e. 3618 pieces of pilot test districts), this block oil area is 1.1Km
2, petroleum-in-place is 1069 × 10
4t, this block is the oil reservoir without pneumatic jack, lower bottomless water on, and its monoclinal structure inclination angle is 15-20 °, and this block deeply buried reservoir, thickness are large but distribution is stable, reservoir properties is good, average pore is 23%, and mean permeability is 2D, but sorting is poor, maximum gravel footpath is 10cm, be generally 0.2-1cm, sorting coefficient is 2.09, and non-homogeneity is strong.
Comparative example
This comparative example provides a kind of well pattern for the fire flood of thick-layer heavy crude reservoir, and the topology layout of this well pattern as shown in Figure 1.
As can be seen from Figure 1, the gas well row having two row parallel in former well pattern, be deployed in the waist of monoclinal structure, the updip direction of the first row gas well row (having 6 mouthfuls of gas wells in this gas well row) deploys a line oil-well drainage parallel with it (having 6 mouthfuls of oil wells in this oil-well drainage), the downdip direction of the second row gas well row (having 3 mouthfuls of gas wells in this gas well row) deploys a line oil-well drainage parallel with it (having 6 mouthfuls of oil wells in this oil-well drainage), also deploys a line oil-well drainage in parallel (having 6 mouthfuls of oil wells in this oil-well drainage) between two row gas well rows;
Adjacent oil-well drainage and gas well arrange between plane array pitch be 105m, the plane well spacing in every a line gas well row between adjacent two gas wells is 105m, and the plane well spacing in every a line oil-well drainage between adjacent two oil wells is 105m;
When adopting the well pattern layout shown in Fig. 1 to carry out fire flood, there is following problem:
1) dispose ranks at monoclinal structure waist and drive well array, cause updip direction has channeling serious, serious interference between two well arrays, air utilization ratio is low, and fireflood takes effect slowly;
2) to adopt the design of layer position unreasonable for note: gas well igniting interval is middle part or top, and the full well section of oil well is produced, and configuration relation cannot reach gravity drainage object;
3) control technique is unreasonable: lack correct understanding to fireflood gravity drainage stimulation machanism, live wire leading edge locus is lacked and accurately judges, the auxiliary soaking taking longitudinal large well section on a large scale in plane draws effect measure, serious to established oily wall destruction, cause and can not form stable displacement;
4) gas injection speed is low: due to above well network design, the design of layer position, has channeling will certainly be caused serious, scene haves no alternative but take the scheme reducing gas injection speed, causes live wire leading edge can not remain stable and promotes.
Embodiment 1
Present embodiments provide a kind of well pattern improving thick-layer heavy crude reservoir fireflood effect, the topology layout of this well pattern as shown in Figure 2.
In above-mentioned well pattern, top linear deployment a line gas well row of high 3618 pieces of monoclinal structures, have 6 mouthfuls of gas wells in this gas well row, the plane well spacing between adjacent two gas wells is 75m (also can be 50m);
At the downdip direction of the first row gas well row, deploy a line oil-well drainage parallel with it (7 mouthfuls of oil wells); This oil-well drainage and gas well arrange between plane array pitch be 105m, the plane well spacing in oil-well drainage between adjacent two oil wells is 75-105m;
In gas well, ignition layer section is the region downward along top of oil horizon, and the thickness in this region accounts for 1/4 (as shown in Figure 3) of whole core intersection;
In oil well, producing well section is region upwards bottom oil reservoir, and the thickness in this region accounts for 3/4 (as shown in Figure 3) of whole core intersection.
Embodiment 2
Present embodiments provide a kind of well pattern improving thick-layer heavy crude reservoir fireflood effect, this well pattern (as shown in Figure 4) obtains after the well pattern provided above-mentioned comparative example 1 is rectified and improved.
1) closing well or shutoff (suppressing updip direction oil well aerogenesis) are carried out to the first row oil-well drainage being positioned at the first row gas well row updip direction;
2) gas injection (preventing it to the interference of updip direction the first row gas well row fireflood effect) is stopped to the second row gas well row being positioned at the first row gas well row downdip direction;
After adjusting so as shown in Figure 4, a line gas well is only had to arrange in well pattern, it is positioned at the high-order bit of monoclinal structure, the downdip direction of above-mentioned gas well row is two row oil-well drainages (being labeled as the first row oil-well drainage and the second row oil-well drainage respectively), plane well spacing in the first row gas well row between adjacent two gas wells is 105m, plane array pitch between the first row gas well row and the first row oil-well drainage is 105m, plane array pitch between two oil-well drainages is 210m, and the plane well spacing in oil-well drainage between adjacent two oil wells is 105m.
Embodiment 3
Present embodiments provide a kind of method improving thick-layer heavy crude reservoir fireflood effect, the method is that the well pattern utilizing above-described embodiment 1 to provide is carried out, and it comprises the following steps:
1) in order to ensure that fireflood is carried out under the high-temp combustion pattern of high displacement efficiency, must ensure fireflood forward position maintain high-temp combustion under fltting speed, on-the-spot this speed is taken as 8cm/d; Then according to the rational gas injection speed of fltting speed estimation gas well of this fireflood leading edge, the present embodiment has carried out long tube experiment to Gaosheng oil field, and result shows the 1m that burns
3oil reservoir needs 300m
3air; According to this result, we establish burning 1m
3oil reservoir needs 300m
3air, combustion front fltting speed is 8cm/d, and the thickness lighting oil reservoir is 20m, and it is 50%-75% that burning involves rate, and so the rational gas injection speed of gas well is=75m × 20m × (50%-75%) × 0.08m × 300m
3/ m
3=1.8-207 ten thousand sides/sky, lights the igniting interval in gas well after gas injection, start to carry out fire flood;
2) to attach most importance to management goal district with fireflood leading edge, wherein, for daily gas <1000 side, the oil well of day production fluid <3t, plane makes full use of the change that the monitoring meanss such as well temperature, tracer constantly follow the tracks of fireflood leading edge, longitudinal direction is furtherd investigate the change of the inner each substratum permeability of L5 sand body, find out height and ooze band as management goal interval;
After determining high permeability formation, steam injection is carried out to this interval and draws effect: 1. propose down-hole oil production tubing string; 2. (steam injection string general structure is: instlated tubular+sealer+heat insulation screen casing+sealer to descend steam injection string, sealed by two sealer cards at the bottom of high permeability formation top, realize selecting the object of the independent steam injection of layer) carry out steam injection (Stimulated Wells Gas Injection, such as injection pressure, steam quality, steam injection rate, cyclic steam injection volume and steam injection intensity etc., can design according to the temperature on the thickness of actual oil reservoir and stratum), then stewing well 7 days; 3. turn and take out (proceeding to oil pumping to produce), propose steam injection string, lower pump;
3) the first row oil-well drainage of the first row gas well row downdip direction is recovered the oil, complete fire flood.
Embodiment 4
Present embodiments provide a kind of method improving thick-layer heavy crude reservoir fireflood effect, the method is that the well pattern utilizing above-described embodiment 2 to provide is carried out, and it comprises the following steps:
1) according to the operation of step 1 in embodiment 3, gas injection is carried out to gas well row, light the igniting interval in gas well, start fire flood;
2) when fireflood leading edge moves to the first row oil-well drainage being positioned at the first row gas well row downdip direction, after the oil well in oil-well drainage is recovered the oil, this oil well is lighted, and closing well or shutoff are carried out to the gas well in above-mentioned the first row gas well row;
3) the second row oil-well drainage being positioned at downdip direction is recovered the oil, complete fire flood.
In above-mentioned fireflood process according to embodiment 3 in the operation of step 2 to fireflood leading edge in daily gas <1000 side, day the oil well of production fluid <3t administer;
For the region (namely in plane, the well spacing of adjacent two oil wells is greater than the region of 105m) that well control degree in fireflood leading edge is low, following means can be adopted to regulate and control: 1. select well, this well plane is positioned at fireflood scope, but longitudinally above produces non-object layer L6 sand body; 2. this well down-hole oil production tubing string is proposed; 3. to fireflood target zone perforation; 4. steam injection string (steam injection string general structure is: instlated tubular+sealer+heat insulation screen casing+sealer, is sealed by two sealer cards at the bottom of high permeability formation top, to the independent steam injection of the layer newly penetrated out) is descended to carry out steam injection, stewing well 7 days; 5. turn and take out (proceeding to oil pumping to produce), propose steam injection string, lower pump;
In this external fireflood process, exceed average gas production 3 times and above oil well if there is gas production, closing well can be carried out to it or envelope is altered.
Compared with comparative example, the method that above-described embodiment 3 and 4 provides, achieves following beneficial effect in fire flood process:
(1) underground combustion situation is improved: compared with comparative example, technical scheme provided by the invention is when carrying out fire flood, within the scope of fireflood, high temperature, secondary high-temp combustion ratio rise to 68% by 20%, and improper fireflood ratio drops to 8% by 50%;
(2) oil reservoir temperature field is progressively expanded: when adopting the scheme in comparative example to carry out fire flood, in plane, reservoir temperature is 60 DEG C; And adopting technical scheme provided by the invention, in plane, reservoir temperature rises to 100 DEG C-200 DEG C generally, is up to 315 DEG C, and in addition, in longitudinal direction, temperature is progressively expanded, and the core intersection that temperature obviously rises is between 10m-55m;
(3) strata pressure progressively improves: pressure observes well display, and when adopting the technical scheme in comparative example to carry out fire flood, strata pressure is about 1MPa, and when adopting technical scheme provided by the invention to carry out fire flood, strata pressure rises to 3.8MPa;
(4) the uneven situation of fireflood frontal movement is controlled: compared with comparative example, technical scheme gas injection direction of propulsion provided by the invention is tending towards even, gas production is tending towards being uniformly distributed, (in comparative example, gassed-out well ratio is 25%, and in technical scheme provided by the invention, gassed-out well ratio is 0) fireflood leading edge is reflected and is advanced uneven situation to be controlled.
(5) Pattern has taken initial shape for stable displacement, and the oil well ratio that takes effect obviously rises: in comparative example, updip direction daily output tolerance is 4.6 × 10
4m
3, and in the present invention, be 0.5 × 10
4m
3; In comparative example, downdip direction daily output tolerance is 1.0 × 104m
3, and in the present invention, be 5.0 × 10
4m
3; In comparative example, the take effect ratio of well of a line is 50%, and in the present invention is 100%; In comparative example, the take effect ratio of well of two wires is 12%, and in the present invention is 55%;
(6) output obviously rises, and two rates are effectively controlled: in comparative example, the typical oil well daily oil production in 6 mouthfuls, pilot test district is 4.2t, and in the present invention is 38t; In comparative example, average individual well daily oil production is 1.4t, and in the present invention is 6.3t; Compared with prior art, after technical scheme provided by the invention being applied to 32 mouthfuls of wells of well group, within its day, produce oil rises to 85t by 24.7t, average individual well day produce oil rise to 2.8t by 1.4t, comprehensive, natural declining rate drops to-19.93%, 1.66% by 43.3%, 22% respectively;
(7) predict that ultimate recovery is higher: adopt technical scheme provided by the invention, estimate that the year produce oil in trivial piece of pilot test peak period next year will reach 24 × 10
4t, ultimate recovery will reach 58.03%, increase recoverable reserves 382 × 10
4t.
In sum, the has channeling existed in prior art is serious, air utilization ratio is low, fireflood takes effect slowly, increase the series of problems such as oily amplitude is low to adopt technical scheme provided by the invention to overcome, and significantly improves fireflood effect.
Claims (13)
1. the well pattern for the fire flood of thick-layer heavy crude reservoir, geological structure face and the horizontal plane of described thick-layer heavy crude reservoir form inclination angle, described well net deployment, on the geological structure face of described oil reservoir, is characterized in that: described well pattern comprises a line gas well row and at least a line oil-well drainage;
Described gas well ranking is in the high-order bit in described geological structure face, and the gas well in this gas well row disposes successively along the high-order bit in geological structure face;
Described oil-well drainage is arranged in the below of the relatively described gas well row of monoclinal structure, and the downdip direction along described geological structure face sets gradually;
Adjacent rows well array be arranged in parallel.
2. well pattern according to claim 1, is characterized in that: the geological structure of described thick-layer heavy crude reservoir is monoclinal structure;
Preferably, the high-order bit in described geological structure face is the highest point in geological structure face.
3. well pattern according to claim 1, is characterized in that: the plane well spacing in described gas well row between adjacent two gas wells is 50-75m; Be preferably 50m.
4. well pattern according to claim 1, is characterized in that: the plane array pitch≤105m in described well pattern between adjacent rows well array.
5. well pattern according to claim 1, is characterized in that: the plane well spacing in described every a line oil-well drainage between adjacent two oil wells is 75-105m.
6. well pattern according to claim 1, is characterized in that: in described every a line oil-well drainage the quantity of oil well arrange with described gas well in the quantity of gas well identical.
7. well pattern according to claim 1, is characterized in that: ignition layer section of described gas well is positioned at the upper area of oil reservoir;
Preferably, described upper area is the region downward along top of oil horizon, and the thickness in this region accounts for 1/4 of whole core intersection.
8. well pattern according to claim 1, is characterized in that: the producing well section of described oil well is positioned at the lower area of oil reservoir;
Preferably, described lower area is region upwards bottom oil reservoir, and the thickness in this region accounts for 3/4 of whole core intersection.
9. the well pattern according to claim 1 or 8, is characterized in that: be provided with igniting interval in described oil well, and described ignition layer section is positioned at the upper area of oil reservoir;
Preferably, described upper area is the region downward along top of oil horizon, and the thickness in this region accounts for 1/4 of whole core intersection.
10. utilize the well pattern described in any one of claim 1-9 thick-layer heavy crude reservoir to be carried out to a method for fireflood, wherein,
When the line number of well pattern moderate heat well array and oil-well drainage is respectively 1, the method comprises the following steps:
A1, to be positioned at reservoir geology structural plane high-order bit the first row gas well row gas well carry out gas injection, firing point fire bed section, start fire flood;
B1, the oil well of the first row oil-well drainage being positioned at the first row gas well row downdip direction to be recovered the oil, complete fire flood;
When the line number of well pattern moderate heat well array is 1, during line number >=2 of oil-well drainage, the method comprises the following steps:
A2, to be positioned at reservoir geology structural plane high-order bit the first row gas well row carry out gas injection, light the igniting interval in gas well, start fire flood;
B2, when fireflood leading edge move to be positioned at the first row gas well row downdip direction the first row oil-well drainage time, after oil well in described oil-well drainage is recovered the oil, to described oil well gas injection, and firing point fire bed section, and closing well or shutoff are carried out to the gas well in described the first row gas well row;
C2, the oil well of the second row oil-well drainage being positioned at above-mentioned the first row oil-well drainage downdip direction to be recovered the oil;
D2, setting according to oil-well drainage line number on reservoir geology structural plane, according to the operating process of step B2-C2, guide fireflood leading edge along the downdip direction linear advancement of reservoir geology structural plane, complete fire flood;
Preferably, in fireflood process, the fltting speed controlling fireflood leading edge is 4-15cm/d.
11. methods according to claim 10, wherein: in fireflood process, the fltting speed controlling fireflood leading edge is 8cm/d.
12. methods according to claim 10, wherein: the method is also included in fireflood process the step that fireflood leading edge is administered;
Preferably, describedly improvement is carried out to fireflood leading edge comprise: the oil well low to the degree that takes effect in fireflood leading edge and/or the low region of well control degree, select its degree of porosity is high, permeability is high interval to carry out steam injection and draw effect; Wherein,
The oil well that the described degree that takes effect is low is daily gas <1000 side and the oil well of day production fluid <3t;
The region that described well control degree is low is the region of the well spacing >105m of adjacent two oil wells in plane;
More preferably, described steam injection is drawn effect and is comprised the following steps: propose down-hole oil production tubing string; Lower steam injection string carries out steam injection, stewing well; Oil pumping is produced, and proposes steam injection string, lower pump.
13. methods according to claim 12, wherein: when the region low to well control degree, its degree of porosity is high, permeability is high interval is selected to carry out steam injection when drawing effect, after proposition down-hole oil production tubing string, lower steam injection string carries out steam injection, before stewing well, also comprise the step of the target zone of fireflood being carried out to perforation.
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