CN105545274B - A kind of well pattern and method improving thick-layer heavy crude reservoir fireflood effect - Google Patents
A kind of well pattern and method improving thick-layer heavy crude reservoir fireflood effect Download PDFInfo
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- CN105545274B CN105545274B CN201510900852.0A CN201510900852A CN105545274B CN 105545274 B CN105545274 B CN 105545274B CN 201510900852 A CN201510900852 A CN 201510900852A CN 105545274 B CN105545274 B CN 105545274B
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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
Abstract
The present invention provides a kind of well patterns and method improving thick-layer heavy crude reservoir fireflood effect, and the well net deployment is on the oil reservoir that geological structure is monoclinal structure, it is characterised in that：The well pattern includes a line gas well row and at least a line oil-well drainage；The gas well ranking in the gas well in the high-order bit of monoclinal structure, gas well row is disposed successively along the high-order bit of the monoclinal structure；The oil-well drainage is located at the lower section of the relatively described gas well row in monoclinal structure, and the downdip direction along the monoclinal structure is set gradually；Adjacent rows well row is arranged in parallel.The present invention also provides a kind of method improving thick heavy crude reservoir fireflood effect, this method includes：Gas injection is carried out to the gas well positioned at oil reservoir structural high part, ignition layer section is lighted, starts fire flood；It recovers the oil to the oil well positioned at downdip direction；Technical solution provided by the invention can make full use of the geological structure height difference of thick-layer heavy crude reservoir, achieve the purpose that gravity drainage.
Description
Technical field
The present invention relates to a kind of well patterns and method improving thick-layer heavy crude reservoir fireflood effect, belong to oil exploitation technology neck
Domain.
Background technology
Combustion in situ is a kind of thermal process improving oil recovery factor, and at low cost, less energy consumption, oil displacement efficiency are high, suitable
Ying Xingguang, it has a extensive future, and can realize that crude oil modifies, but its mechanism of oil displacement is complicated, has steam drive, hot water flooding, flue gas flooding
It is big to regulate and control difficulty etc. a variety of driving mechanisms, in implementation process, causes live success rate low.It is successfully developed oil reservoir and belongs to thin layer more
Oil reservoir, it is primary completely new exploration and practice to carry out fireflood to the thick massive inspissated pool of similar Gaosheng oil field.With Liaohe Faulted Depression
For the high 3618 blocks of lotus flower oil reservoirs in basin promotion area, which is 1.1Km2, petroleum-in-place be 1069 ×
104T, the block are the monoclinal structure oil reservoir without pneumatic jack, lower no bottom water on one, and monocline inclination angle is 15-20 °, deeply buried reservoir, thickness
Degree is big but distribution is stablized, and reservoir properties are good, average pore 23%, mean permeability 2D, but sorts poor, maximum gravel diameter
For 10cm, generally 0.2-1cm, sorting coefficient 2.09, anisotropism is strong.
For the block in input exploitation in 1986, development scheme was steam soak, and it is whole that well pattern twice is experienced in development process
Body encrypts (being encrypted into 105m by 210m), and steam soak development phase block peak period year oil-producing reaches 13.9 × 104T, with
The completion of encrypted work twice, block strata pressure significantly decline, and production per cycle exponentially successively decrease by rule, and block yield is with every
Year declines 1 × 104-2×104The drastically atrophy of the speed of t, natural declining rate are up to 35% or more, and block yearly rate-oil production drops to only
4.0×104t。
Since a large amount of remaining oils can not be employed between steam soak latter stage development effectiveness variation well, it is transferred within 2008 fireflood exploitation
Pilot test, and gradually expand scale and reach 18 current well groups, fireflood control reserve has accounted for block oil in place
52%.Since fireflood is developed 5 years, trial zone production effect is poor, does not reach conceptual design index always.It is mainly shown as fireflood
Slowly effect, the well production that takes effect is low, and has channeling is frequent, and the well production that takes effect is unstable, and regulation and control difficulty is big.By tight to fireflood pilot wellgroup
Close tracking and research, analysis there are the problem of, it is believed that the reason of following several respects, affects fireflood development effectiveness：
1) flooding pattern design is unreasonable：Well row is driven in monoclinal structure waist deployment ranks, causes updip direction has channeling tight
Weight, serious interference between two wells are arranged, air utilization ratio is low, fireflood slowly effect；
2) it is unreasonable to adopt the design of layer position for note：Gas well lights a fire interval as middle part or top, and the full well section of oil well produces, configuration relation
On be unable to reach gravity drainage purpose；
3) control technique is unreasonable：Correct understanding is lacked to fireflood gravity drainage stimulation machanism, firewire leading edge locus is lacked
Weary accurate judgement, the auxiliary soaking for taking a wide range of longitudinal big well section in plane draws effect measure, broken to established oily wall
Bad effect is serious, causes that stable displacement cannot be formed；
4) gas injection speed is low：Since above well network design, layer position are designed, has channeling will certainly be caused serious, scene must not
Having taken reduces the scheme of gas injection speed, causes firewire leading edge that cannot maintain to stablize promotion.
Invention content
In order to solve the above technical problems, the purpose of the present invention is to provide a kind of raising thick-layer heavy crude reservoir fireflood effects
Well pattern and method, this method can make full use of the geological structure height difference of thick-layer heavy crude reservoir, achieve the purpose that gravity drainage；Together
When, it efficiently solves the problems, such as that updip direction has channeling existing in the prior art is serious during fireflood, can efficiently use
Air improves fireflood effect.
In order to achieve the above objectives, the present invention provides a kind of well pattern improving thick-layer heavy crude reservoir fireflood effect, the thickness
Geological structure face and the horizontal plane of layer heavy crude reservoir form inclination angle, the well net deployment on the geological structure face of the oil reservoir,
It is characterized in that：The well pattern includes a line gas well row and at least a line oil-well drainage；
The gas well ranking is along geological structure face in the gas well in the high-order bit in the geological structure face, gas well row
What high-order bit was disposed successively, the high-order bit in the geological structure face that gas well row is deployed in oil reservoir be can make full use of into geological structure height
Difference achievees the purpose that gravity drainage；
The oil-well drainage is located at the lower section of the relatively described gas well row in monoclinal structure, the side of having a down dip along the geological structure face
To setting gradually；
Adjacent rows well row is arranged in parallel.
In above-mentioned well pattern, it is preferable that the geological structure of the thick-layer heavy crude reservoir is monoclinal structure；It is highly preferred that institute
The high-order bit for stating geological structure face is that (such as 3618 pieces of pilot test areas are monoclinal structure oil to the highest point in geological structure face
It hides, inclination angle is 15-20 °, the similar band in construction top, and gas well is carried out linear deployment along the band when deployment)
The prior art is to deploy two rows of gas wells (as shown in Figure 1) in 3618 pieces of waist, using side in the prior art
There are many drawbacks during fireflood for case, cannot give full play to the advantage of gravity drainage, and use technology provided by the invention
Gas well is deployed in the high-order bit of oil reservoir, and only deployment a line gas well row, on the one hand avoids well pattern in the prior art by scheme
When carrying out fireflood, downdip direction the second row gas well row interferes the fireflood effect of updip direction first row gas well, another
Aspect can make full use of construction difference and achieve the purpose that gravity drainage, keep fireflood effect more preferable.
In above-mentioned well pattern, it is preferable that the plane well spacing in the gas well row between adjacent two gas well is 50-75m；It is preferred that
For 50m.
In above-mentioned well pattern, it is preferable that the plane array pitch between the gas well row and adjacent oil-well drainage is≤105m.
Well spacing and well array pitch are arranged in above-mentioned numberical range the present invention, can ensure during fireflood, fireflood
Leading edge is uniformly pushed ahead.
In above-mentioned well pattern, it is preferable that the plane well spacing in every a line oil-well drainage between adjacent two oil well is 75-
105m。
In above-mentioned well pattern, it is preferable that the quantity of oil well and gas well in gas well row in the oil-well drainage per a line
Quantity is identical.
In above-mentioned well pattern, it is preferable that ignition layer section of the gas well is located at the upper area of oil reservoir；It is highly preferred that institute
It is along the downward region in top of oil horizon to state upper area, and the thickness in the region accounts for the 1/4 of entire core intersection.
In above-mentioned well pattern, it is preferable that the producing well section of the oil well is located at the lower area of oil reservoir；It is highly preferred that institute
It is along the upward region in oil reservoir bottom to state lower area, and the thickness in the region accounts for the 3/4 of entire core intersection.
In above-mentioned well pattern, it is preferable that the oil well is internally provided with igniting interval, which is located at along the upper of oil reservoir
Portion region；It is highly preferred that the upper area is along the downward region in top of oil horizon, the thickness in the region accounts for entire core intersection
1/4.
Ignition layer section and production well section are designed using above-mentioned technical proposal, injection-production well section can be made longitudinally to be staggered, fully profit
Achieve the purpose that the increasing oil that takes effect with construction height difference.
The present invention also provides a kind of methods carrying out fireflood to thick-layer heavy crude reservoir using above-mentioned well pattern, wherein
When the line number of gas well row and oil-well drainage is respectively 1 in well pattern, this approach includes the following steps：
A1, gas injection is carried out to the gas well in the first row gas well of reservoir geology construction face high-order bit row, lights igniting
Interval starts fire flood；
B1, it recovers the oil to the oil well in the first row oil-well drainage that the first row gas well arranges downdip direction, completes fireflood
It recovers the oil；
When the line number that gas well is arranged in well pattern is 1, when the line number of oil-well drainage >=2, this approach includes the following steps：
A2, row gas injection is discharged into the first row gas well positioned at reservoir geology construction face high-order bit, lights the igniting in gas well
Interval starts fire flood；
B2, when fireflood leading edge move to positioned at the first row gas well arrange downdip direction the first row oil-well drainage when, to the oil well
After oil well in row recovers the oil, to the oil well gas injection, and ignition layer section is lighted, and to the fire in the first row gas well row
Well carries out closing well or closure；
C2, it recovers the oil to the oil well in the second row oil-well drainage of above-mentioned the first row oil-well drainage downdip direction；
D2, according in reservoir geology construction face oil well rank number setting (on oil reservoir well arrange line number can be according to oil reservoir
Construction and the size of oil area be configured), according to the operating process of step B2-C2, guiding fireflood leading edge is along oil reservoir
The downdip direction linear advancement of matter construction face, by the first row gas well, row is advanced to the first row oil-well drainage, then by the first row oil-well drainage
Iterative method completes fire flood to line n oil-well drainage；
Preferably, during fireflood, when carrying out gas injection, gas injection speed is controlled, to control the up-front fltting speed of fireflood
It (for fireflood viscous crude, keeps the up-front fltting speed of fireflood for 4-15cm/d within the above range, fireflood can be made to be driven in height
For being carried out under the high-temp combustion pattern of efficiency).
Above-mentioned fireflood method can guide fireflood leading edge uniformly to be promoted along the downdip direction of reservoir geology construction face, solve
The serious problem of has channeling during fireflood, and air utilization ratio is high, and fireflood is quick.
In the above-mentioned methods, it is preferable that during fireflood, the control up-front fltting speed of fireflood is 8cm/d.
In the above-mentioned methods, it is preferable that this method further includes the steps that being administered to fireflood leading edge during fireflood；
It is highly preferred that it is described to fireflood leading edge carry out administer include：To the low oil well of degree and/or the well control degree of taking effect in fireflood leading edge
Low region selects the interval that its porosity is high, permeability is high to carry out steam injection and draws effect；Wherein, the low oil well of the degree that takes effect
For daily gas<1000 sides and daily output liquid<The oil well of 3t, the low region of the well control degree be plane on adjacent two oil well well between
Away from>The region of 105m；Include the following steps it is further preferred that the steam injection draws effect：It is proposed down-hole oil production tubing string；Bet steam pipe
Column carries out steam injection, boils in a covered pot over a slow fire well；Oil pumping production, proposes steam injection string, lower pump；
During effect is drawn in gas injection, when lower tubular column carries out steam injection, Stimulated Wells Gas Injection (injection pressure, steam quality, note
Vapour speed, cyclic steam injection volume and steam injection intensity etc.), it can be designed according to the thickness of practical oil reservoir and the temperature on stratum, just
In the case of often, in prime stratum temperature i.e. 60 DEG C, it can be set per 55 side's quantity of steam of rice bran oil layer by first run steam injection
Meter, often increases by a round later, and every meter of steam injection amount increases by 5 sides；In the case of formation temperature has gone up and is more than 60 DEG C, steam injection
Amount can be designed with the viscosity of based on crude.
In the above-mentioned methods, it is preferable that when the region low to well control degree, select the layer that its porosity is high, permeability is high
When Duan Jinhang steam injections draw effect, after proposing down-hole oil production tubing string, lower steam injection string carries out steam injection, further includes to fire before boiling in a covered pot over a slow fire well
The target zone of drive carries out the step of perforation.
Beneficial effects of the present invention：
1) technical solution provided by the invention can make full use of the geological structure height difference of thick-layer heavy crude reservoir, reach gravity
The purpose of draining；
2) technical solution provided by the invention can keep stablizing burning during fireflood, and guiding fireflood leading edge is along monocline
The downdip direction of construction uniformly promotes；Meanwhile updip direction gas existing in the prior art is efficiently solved during fireflood
Serious problem is altered, air can be efficiently used, improves fireflood effect.
Description of the drawings
Fig. 1 is the well pattern layout in 3618 pieces of pilot test areas in comparative example；
Fig. 2 is well pattern layout new in 3618 pieces of pilot test areas in embodiment 1；
Fig. 3 is the position view of 1 moderate heat well point fire bed section of embodiment and oil well production well section；
Fig. 4 is the well pattern layout after being rectified and improved for the well pattern in comparative example in 3618 pieces of pilot test areas.
Specific implementation mode
In order to which technical characteristic, purpose and the advantageous effect to the present invention are more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but should not be understood as to the present invention can practical range restriction.
Following embodiments are using 3618 blocks of lotus flower oil reservoirs of Liaohe Faulted Depression basin promotion as objective for implementation, to Liaohe Faulted Depression basin height
It rises 3618 pieces of lotus flower oil reservoirs (i.e. 3618 pieces of pilot test areas) and has carried out regulation and control experiment, which is 1.1Km2, oil
Oil in place is 1069 × 104T, the block are the oil reservoir without pneumatic jack, lower no bottom water on one, and monoclinal structure inclination angle is 15-20 °,
The block deeply buried reservoir, thickness are big but distribution is stablized, and reservoir properties are good, average pore 23%, mean permeability 2D,
But sorting is poor, and maximum gravel diameter is 10cm, and generally 0.2-1cm, sorting coefficient 2.09, anisotropism is strong.
Comparative example
This comparative example provides a kind of well pattern for thick-layer heavy crude reservoir fire flood, and the topology layout of the well pattern is as schemed
Shown in 1.
From figure 1 it appears that the gas well row for there are two rows parallel in former well pattern, it is deployed in the waist of monoclinal structure, first
The updip direction of row gas well row (having 6 mouthfuls of gas wells in gas well row) deploys a line oil-well drainage parallel with it (in the oil-well drainage
Have 6 mouthfuls of oil wells), the downdip direction of the second row gas well row (having 3 mouthfuls of gas wells in gas well row) deploys a line oil parallel with it
Well arranges (having 6 mouthfuls of oil wells in the oil-well drainage), and a line oil-well drainage in parallel (oil-well drainage is also deployed between two row gas wells row
In have 6 mouthfuls of oil wells)；
Plane array pitch between adjacent oil-well drainage and gas well row is 105m, in being arranged per a line gas well between adjacent two gas well
Plane well spacing is 105m, and the plane well spacing in every a line oil-well drainage between adjacent two oil well is 105m；
When being laid out progress fire flood using well pattern shown in FIG. 1, have the following problems：
1) well row is driven in monoclinal structure waist deployment ranks, causes updip direction has channeling serious, serious interference between two wells row,
Air utilization ratio is low, fireflood slowly effect；
2) it is unreasonable to adopt the design of layer position for note：Gas well lights a fire interval as middle part or top, and the full well section of oil well produces, configuration relation
On be unable to reach gravity drainage purpose；
3) control technique is unreasonable：Correct understanding is lacked to fireflood gravity drainage stimulation machanism, firewire leading edge locus is lacked
Weary accurate judgement, the auxiliary soaking for taking a wide range of longitudinal big well section in plane draws effect measure, broken to established oily wall
Bad effect is serious, causes that stable displacement cannot be formed；
4) gas injection speed is low：Since above well network design, layer position are designed, has channeling will certainly be caused serious, scene must not
Having taken reduces the scheme of gas injection speed, causes firewire leading edge that cannot maintain to stablize promotion.
Embodiment 1
A kind of well pattern improving thick-layer heavy crude reservoir fireflood effect is present embodiments provided, the topology layout of the well pattern is as schemed
Shown in 2.
In above-mentioned well pattern, there are 6 mouthfuls in top linear deployment a line gas well row of high 3618 pieces of monoclinal structures, gas well row
Gas well, the plane well spacing between adjacent two gas well are 75m (or 50m)；
In the downdip direction of the first row gas well row, a line oil-well drainage parallel with it (7 mouthfuls of oil wells) is deployed；The oil-well drainage
Plane array pitch between being arranged gas well is 105m, and the plane well spacing in oil-well drainage between adjacent two oil well is 75-105m；
Ignition layer section is along the downward region in top of oil horizon in gas well, and the thickness in the region accounts for the 1/4 of entire core intersection
(as shown in Figure 3)；
It is along the upward region in oil reservoir bottom that well section is produced in oil well, and the thickness in the region accounts for the 3/4 of entire core intersection
(as shown in Figure 3).
Embodiment 2
A kind of well pattern improving thick-layer heavy crude reservoir fireflood effect is present embodiments provided, which is
It is obtained after being rectified and improved to the well pattern that above-mentioned comparative example 1 provides.
1) the first row oil-well drainage for arranging updip direction positioned at the first row gas well is carried out closing well or blocked (to inhibit updip direction
Oil well aerogenesis)；
2) stopping gas injection to the second row gas well row for arranging downdip direction positioned at the first row gas well (prevents it to updip direction the
A line gas well arranges the interference of fireflood effect)；
As shown in figure 4, there was only a line gas well row in well pattern after adjusting in this way, it is located at the high-order bit of monoclinal structure,
The downdip direction of above-mentioned gas well row is two row oil-well drainages (being respectively labeled as the first row oil-well drainage and the second row oil-well drainage), the first row
Plane well spacing in gas well row between adjacent two gas well is 105m, and the plane between the first row gas well row and the first row oil-well drainage is arranged
Away from for 105m, the plane array pitch between two oil-well drainages is 210m, and the plane well spacing in oil-well drainage between adjacent two oil well is 105m.
Embodiment 3
A kind of method improving thick-layer heavy crude reservoir fireflood effect is present embodiments provided, this method is to utilize above-mentioned implementation
What the well pattern that example 1 provides carried out comprising following steps：
1) in order to ensure that fireflood carries out under the high-temp combustion pattern of high displacement efficiency, it is necessary to assure fireflood forward position maintains
This speed is taken as 8cm/d by the fltting speed under high-temp combustion, scene；Then estimated according to the up-front fltting speed of this fireflood
The rational gas injection speed of gas well is calculated, the present embodiment has carried out long tube experiment to Gaosheng oil field, the results showed that burning 1m3Oil reservoir needs
300m3Air；According to this result, we set burning 1m3Oil reservoir needs 300m3Air, combustion front fltting speed are 8cm/d, point
The thickness of fuel oil layer be 20m, burning involve rate be 50%-75%, then the rational gas injection speed of gas well be=75m × 20m ×
(50%-75%) × 0.08m × 300m3/m3Ten thousand sides of=1.8-207/day light the igniting interval in gas well after gas injection, start into
Row fire flood；
2) using fireflood leading edge as emphasis management goal area, wherein for daily gas<1000 sides produce liquid daily<The oil well of 3t,
The monitoring means such as well temperature, tracer are made full use of constantly to track the up-front variation of fireflood in plane, longitudinally deep enters to study L5 sand
The variation of each substratum permeability in internal portion, finds out hypertonic band as management goal interval；
After determining high permeability formation, steam injection is carried out to the interval and draws effect：1. proposing down-hole oil production tubing string；2. lower steam injection string
(steam injection string general structure is：Instlated tubular+sealer+heat-insulated screen casing+sealer, high permeability formation top bottom pass through two sealer cards
Seal, realize the purpose for selecting the independent steam injection of layer) carry out steam injection (Stimulated Wells Gas Injection, such as injection pressure, steam quality, note
Vapour speed, cyclic steam injection volume and steam injection intensity etc. can be designed according to the thickness of practical oil reservoir and the temperature on stratum), so
Well is boiled in a covered pot over a slow fire afterwards 7 days；3. turning to take out and (be transferred to oil pumping production), steam injection string, lower pump are proposed；
3) the first row oil-well drainage for arranging the first row gas well downdip direction recovers the oil, and completes fire flood.
Embodiment 4
A kind of method improving thick-layer heavy crude reservoir fireflood effect is present embodiments provided, this method is to utilize above-mentioned implementation
What the well pattern that example 2 provides carried out comprising following steps：
1) row gas injection is discharged into gas well according to the operation of step 1 in embodiment 3, lights the igniting interval in gas well, started
Fire flood；
2) when fireflood leading edge moves to the first row oil-well drainage for arranging downdip direction positioned at the first row gas well, in oil-well drainage
After oil well is recovered the oil, which is lighted, and closing well or closure are carried out to the gas well in above-mentioned the first row gas well row；
3) it recovers the oil to the second row oil-well drainage positioned at downdip direction, completes fire flood.
According to the operation of step 2 in embodiment 3 to daily gas in fireflood leading edge during above-mentioned fireflood<1000 sides, day
Produce liquid<The oil well of 3t is administered；
For the low region of well control degree in fireflood leading edge, (the well spacing of adjacent two oil well is more than the area of 105m i.e. in plane
Domain), following means may be used and regulated and controled：1. selecting well, fireflood range is located in the well plane, but non-purpose is produced on longitudinal direction
Layer L6 sand bodies；2. proposing the well down-hole oil production tubing string；3. to fireflood target zone perforation；4. (steam injection string is general for lower steam injection string
Structure is：Instlated tubular+sealer+heat-insulated screen casing+sealer, high permeability formation top bottom is sealed by two sealer cards, to newly penetrating out
The independent steam injection of layer) carry out steam injection, boil in a covered pot over a slow fire well 7 days；5. turning to take out and (be transferred to oil pumping production), steam injection string, lower pump are proposed；
In addition during fireflood, the oil well of 3 times of average gas production or more is higher by if there is gas production, it can be to it
It carries out closing well or envelope is altered.
Compared with comparative example, the method that above-described embodiment 3 and 4 provides achieves following beneficial during fire flood
Effect：
(1) underground combustion situation is improved：Compared with comparative example, technical solution provided by the invention is carrying out fireflood
When oil recovery, high temperature, secondary high-temp combustion ratio rise to 68% by 20% within the scope of fireflood, and improper fireflood ratio is declined by 50%
It is 8%；
(2) oil reservoir thermal field gradually extends：When carrying out fire flood using the scheme in comparative example, reservoir temperature is in plane
60℃；And technical solution provided by the invention is used, reservoir temperature generally rises to 100 DEG C -200 DEG C, up to 315 in plane
DEG C, in addition, longitudinal upper temperature gradually extends, the core intersection that temperature obviously rises is between 10m-55m；
(3) strata pressure steps up：Pressure observation well is shown, fire flood is carried out using the technical solution in comparative example
When, strata pressure is about 1MPa, and when use technical solution provided by the invention progress fire flood, strata pressure rises to
3.8MPa；
(4) fireflood frontal movement unevenness situation is controlled：Compared with comparative example, technical solution gas injection provided by the invention
Direction of propulsion tends to be uniform, and gas production tends to be uniformly distributed, and (gassed-out well ratio is 25% in comparative example, and provided by the invention
Gassed-out well ratio is reflected the uneven situation of propulsion for 0) fireflood leading edge and is controlled in technical solution.
(5) Pattern has taken initial shape for stable displacement, and the oil well ratio that takes effect obviously rises：Updip direction daily gas in the comparative example
Amount is 4.6 × 104m3, and in the present invention it is 0.5 × 104m3；Downdip direction daily output tolerance is 1.0 × 104m in the comparative example3, and
It is 5.0 × 10 in the present invention4m3；In the comparative example a line take effect well ratio be 50%, and in the present invention be 100%；It is comparing
Example in two wires take effect well ratio be 12%, and in the present invention be 55%；
(6) yield obviously rises, and two rates are effectively controlled：The typical oil well daily output in 6 mouthfuls of pilot test area in the comparative example
Oil mass is 4.2t, and in the present invention is 38t；The individual well daily oil production that is averaged in the comparative example is 1.4t, and in the present invention is 6.3t；
Compared with prior art, after technical solution provided by the invention being applied to 32 mouthfuls of wells of well group, a day oil-producing is risen by 24.7t
To 85t, average individual well day oil-producing rises to 2.8t by 1.4t, and comprehensive, natural declining rate drops to by 43.3%, 22% respectively-
19.93%, 1.66%；
(7) prediction ultimate recovery is higher：Using technical solution provided by the invention, it is contemplated that trivial piece of peak of pilot test
The year oil-producing in next year phase is up to 24 × 104T, ultimate recovery are up to 58.03%, increase recoverable reserves 382 × 104t。
In conclusion has channeling existing in the prior art can be overcome serious, empty using technical solution provided by the invention
Gas utilization rate is low, fireflood slowly effect, increases a series of problems such as oily amplitude is low, significantly improves fireflood effect.
Claims (8)
1. a kind of well pattern for thick-layer heavy crude reservoir fire flood, the geological structure face of the thick-layer heavy crude reservoir and horizontal plane
Inclination angle is formed, the well net deployment is on the geological structure face of the oil reservoir, it is characterised in that：The well pattern includes a line fire
Well is arranged and at least a line oil-well drainage；
The gas well ranking is along the high portion in geological structure face in the gas well in the high-order bit in the geological structure face, gas well row
What position was disposed successively；
The oil-well drainage is located in monoclinal structure the lower section of the relatively described gas well row, along the geological structure face downdip direction according to
Secondary setting；
Adjacent rows well row is arranged in parallel；Wherein,
Plane array pitch≤105m in the well pattern between adjacent rows well row；It is flat between adjacent two gas well in the gas well row
Face well spacing is 50-75m；Plane well spacing in every a line oil-well drainage between adjacent two oil well is 75-105m；
Ignition layer section of the gas well is located at the upper area of oil reservoir, the upper area be along the downward region in top of oil horizon,
The thickness in the region accounts for the 1/4 of entire core intersection；
The producing well section of the oil well is located at the lower area of oil reservoir, the lower area be along the upward region in oil reservoir bottom,
The thickness in the region accounts for the 3/4 of entire core intersection；Igniting interval is equipped in the oil well, ignition layer section is located at oil reservoir
Upper area, the upper area are along the downward region in top of oil horizon, and the thickness in the region accounts for the 1/4 of entire core intersection.
2. well pattern according to claim 1, it is characterised in that：The geological structure of the thick-layer heavy crude reservoir is monocline structure
It makes.
3. well pattern according to claim 2, it is characterised in that：The high-order bit in the geological structure face is geological structure face
Highest point.
4. well pattern according to claim 1, it is characterised in that：The quantity of oil well and the fire in the oil-well drainage per a line
The quantity of gas well is identical in well row.
5. a kind of method carrying out fireflood to thick-layer heavy crude reservoir using claim 1-4 any one of them well pattern, wherein
When the line number of gas well row and oil-well drainage is respectively 1 in well pattern, this approach includes the following steps：
A1, gas injection is carried out to the gas well in the first row gas well of reservoir geology construction face high-order bit row, lights ignition layer section,
Start fire flood；
B1, it recovers the oil to the oil well in the first row oil-well drainage that the first row gas well arranges downdip direction, completes fire flood；
When the line number that gas well is arranged in well pattern is 1, when the line number of oil-well drainage >=2, this approach includes the following steps：
A2, row gas injection is discharged into the first row gas well positioned at reservoir geology construction face high-order bit, lights the igniting interval in gas well,
Start fire flood；
B2, when fireflood leading edge move to positioned at the first row gas well arrange downdip direction the first row oil-well drainage when, in the oil-well drainage
Oil well recovered the oil after, to the oil well gas injection, and light ignition layer section, and to the first row gas well row in gas well into
Row closing well or closure；
C2, it recovers the oil to the oil well in the second row oil-well drainage of above-mentioned the first row oil-well drainage downdip direction；
D2, the setting that number is ranked according to oil well in reservoir geology construction face guide fireflood according to the operating process of step B2-C2
Leading edge completes fire flood along the downdip direction linear advancement of reservoir geology construction face；
During fireflood, the control up-front fltting speed of fireflood is 4-15cm/d.
6. according to the method described in claim 5, wherein：During fireflood, the control up-front fltting speed of fireflood is 8cm/
d。
7. according to the method described in claim 5, wherein：This method further includes being administered to fireflood leading edge during fireflood
The step of.
8. according to the method described in claim 7, wherein：It is described to fireflood leading edge carry out administer include：To seeing in fireflood leading edge
The low oil well of effect degree and/or the low region of well control degree select the interval that its porosity is high, permeability is high to carry out steam injection and draw
Effect；Wherein,
The low oil well of the degree that takes effect is daily gas<1000 sides and daily output liquid<The oil well of 3t；
The low region of the well control degree is the well spacing of adjacent two oil well in plane>The region of 105m.
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| CN106640012A (en) * | 2016-12-01 | 2017-05-10 | 中国石油天然气股份有限公司 | Fireflooding oil-extracting method for exploiting super heavy oil reservoir with bottom water |
| CN106884639A (en) * | 2017-04-05 | 2017-06-23 | 中国石油天然气股份有限公司 | A kind of three-dimensional fireflood method of multilayer laminar oil reservoir |
| CN107035354A (en) * | 2017-06-10 | 2017-08-11 | 大庆东油睿佳石油科技有限公司 | A kind of oil production method for encrypting spontaneous mixed phase hot fluid under horizontal well surge well |
| CN108894763B (en) * | 2018-06-22 | 2020-11-24 | 西安石油大学 | Method for burying and utilizing tail gas generated by linear fireflooding |
| CN113445984B (en) * | 2020-03-25 | 2022-06-03 | 中国石油天然气股份有限公司 | Fire flooding mining method for side water invasion heavy oil reservoir with stratum inclination angle |
| CN112377161A (en) * | 2020-11-19 | 2021-02-19 | 中国石油天然气股份有限公司 | Fire flooding method for low-permeability layered heavy oil reservoir |
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