CN104389572B - Method for exploiting layered oil reservoir in-situ combustion - Google Patents
Method for exploiting layered oil reservoir in-situ combustion Download PDFInfo
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- CN104389572B CN104389572B CN201410587649.8A CN201410587649A CN104389572B CN 104389572 B CN104389572 B CN 104389572B CN 201410587649 A CN201410587649 A CN 201410587649A CN 104389572 B CN104389572 B CN 104389572B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 94
- 238000002347 injection Methods 0.000 claims abstract description 81
- 239000007924 injection Substances 0.000 claims abstract description 81
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000003546 flue gas Substances 0.000 claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 230000001360 synchronised effect Effects 0.000 claims abstract description 6
- 239000002356 single layer Substances 0.000 claims description 9
- 239000010410 layer Substances 0.000 claims description 6
- 239000011229 interlayer Substances 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000010304 firing Methods 0.000 claims 1
- 238000012856 packing Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 165
- 238000011161 development Methods 0.000 abstract description 9
- 239000010779 crude oil Substances 0.000 abstract description 8
- 239000002918 waste heat Substances 0.000 abstract description 4
- 239000000567 combustion gas Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/14—Obtaining from a multiple-zone well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/40—Separation associated with re-injection of separated materials
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Treating Waste Gases (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention relates to a method for exploiting layered oil reservoir by in-situ combustion, which comprises the steps of putting a layered injection-production pipe column into a shaft of each gas injection well and a production well, arranging a packer at the empty position of an oil ring which is 1 m above the bottom boundary of each oil layer, injecting air into the lowest oil layer to maintain the combustion of the lowest oil layer, returning hot oil and flue gas generated by combustion to the ground through a first-line production well, injecting one or more oil layers at the upper part from the annular space of the gas injection well after being separated by a gas-liquid separator, displacing crude oil and entering a second-line production well, and the like, thereby realizing the synchronous development of the layered oil reservoir by multilayer fire flooding and gas flooding. The invention adopts a layer-by-layer in-situ combustion and flue gas reinjection layering gas drive development mode, realizes zero emission of flue gas generated by combustion, effectively utilizes the waste heat and energy of the flue gas, and realizes economic and efficient development of a layered oil reservoir.
Description
Technical field
The present invention is about a kind of combustion in situ oil production method, particularly relates to one and opens for stratiform thin oil and heavy crude reservoir
Send out the method that the combustion in situ to improve crude oil recovery ratio exploits stratified deposit.
Background technology
Fireflood technology can be divided into forward combustion and reverse burning by the moving direction injecting direction of air and combustion front,
It is identical with the moving direction of combustion front that the former injects air, therefore referred to as forward combustion；Before the latter's air-flow direction and burning
The moving direction of edge is just the opposite, therefore referred to as reverse combustion or reverse burning；Forward combustion is by water mixing in injection air the most again
It is divided into dry forward combustion and wet forward combustion.
Wherein, dry forward combustion and wet forward combustion are mainly used in ligh-oil reservoir and wells in conventional heavy oil reservoir；Reversely combustion
Burning is mainly used in spy, super-heavy oil deposit.
But no matter for dry forward combustion, wet forward combustion or reverse burning, the system of its combustion in situ and mode,
All limited by geology reservoir.The stratified deposit less for oil reservoir gradient, thickness in monolayer is less, mainly uses mesh
The linear fireflood well pattern of front routine or the exploitation of area fireflood well pattern.But there is asking of the following aspects in conventional fireflood exploitation
Topic:
(1) in fireflood development process, a large amount of flue gases that burning produces mainly are passed through to be deployed in together with residual air
Air draft well array in oil reservoir goes out ground, has poison owing to burning creates substantial amounts of hydrogen sulfide, sulfur dioxide, carbon monoxide etc.
Body, therefore environmental pollution is serious；
(2) waste gas of discharging burnt is generally of higher temperature and heat, therefore cannot utilize remaining in discharge process
Heat, amount of heat is lost in air；
(3) burning creates substantial amounts of gas, is fully available for oil reservoir oil displacement, but in conventional fireflood development process,
There is no efficient system utilizes this portion gas to carry out displacement of reservoir oil production with mode, causes the waste of substantial amounts of source of the gas；
(4) for stratified deposit, combustion in situ exploitation successively, all some is burned off the crude oil in each oil reservoir,
Substantial amounts of crude oil is caused to lose.
Thus, the present inventor relies on experience and the practice being engaged in relevant industries for many years, proposes a kind of combustion in situ mined bed
The method of shape oil reservoir, to overcome the defect of prior art.
Summary of the invention
The method that it is an object of the invention to provide a kind of combustion in situ exploitation stratified deposit, to realize the cigarette that burning produces
Road gas zero, effectively utilizes flue gas waste heat and energy, it is achieved stratified deposit economical and efficient is developed.
The object of the present invention is achieved like this, and the method for a kind of combustion in situ exploitation stratified deposit, the method is at least wrapped
Include following steps:
Step one: dispose well pattern, the perforating modes of gas injection well and producing well is set；
The vertical gas injection well of at least a bite producing well vertical with many mouthfuls is set and linearly sequentially arranges to form flooding pattern；
Many mouthfuls of producing wells are directed away from a direction referred to as line producing well successively of gas injection well, two wires producing well, three line producing wells, four lines lifes
Produce well, and so on；In plane at a distance of 50-500 rice between gas injection well and producing well, between producing well and producing well；Described
Gas injection well and producing well all enter down demixing injection-production tubing string, institute in each independent oil reservoir perforation, gas injection well and producing well pit shaft
State gas injection well and producing well oil jacket annular space position on boundary at the bottom of each oil reservoir in addition to bottom oil reservoir near above and envelope is set
Every device, utilize demixing injection-production tubing string and packer with the use of, it is achieved monolayer opens and closes gas injection, and monolayer is opened and closed
Close production；Bottom oil reservoir becomes an oil reservoir, becomes No. two oil reservoirs, No. three oil reservoirs, No. four oil reservoirs the most successively, and with this type of
Push away；
Step 2:
(21) inject air from original gas injection well to an oil reservoir perforated interval and light oil reservoir, and continue air injection to maintain one
The burning of number oil reservoir；
(22) by ground gas-liquid separator, the flue gas that one line producing well, two wires producing well are discharged is separated, and from original
No. two oil reservoir perforated intervals of gas injection well are recycled into No. two oil reservoirs to carry out flue gas flooding；
(23) one line producing wells, an oil reservoir of two wires producing well, No. two oil reservoir perforated interval synchronous production；
Step 3:
(31) when combustion front arrives near an oil reservoir perforated interval of a line producing well, original gas injection well stops note
Gas, an oil reservoir perforated interval of a line producing well stops producing, and changes an oil reservoir perforated interval from a line producing well into and injects sky
Gas burns away；
(32) flue gas discharged by two wires producing well by ground gas-liquid separator separates, and from original gas injection well and a line
No. two oil reservoir perforated intervals of producing well are recycled into No. two oil reservoirs to carry out flue gas flooding；
(33) oil reservoir of two wires producing well, No. two oil reservoir perforated intervals produce；
Step 4:
(41) when combustion front arrives an oil reservoir perforated interval of two wires producing well, or an oil reservoir burning terminates
Time, an oil reservoir perforated interval of all wells is closed；
(42) No. three oil reservoir perforated intervals of original gas injection well and two wires producing well are opened, from original gas injection well to No. three oil reservoirs
Perforated interval injects air and lights oil reservoir, and continues air injection to maintain No. three oil reservoir burnings；
(43) by ground gas-liquid separator, the flue gas that one line producing well, two wires producing well are discharged is separated, and from original
No. two oil reservoir perforated intervals of gas injection well and a line producing well are recycled into No. two oil reservoirs to carry out flue gas flooding；
(44) No. two oil reservoirs of two wires producing well, No. three oil reservoir perforated intervals recover the oil；
Step 5:
(51) at the end of flue gas scurries into No. two oil reservoir perforated intervals of two wires producing well, or No. two oil reservoirs productions, all
No. two oil reservoir perforated intervals of well are closed；
(52) continue to inject air point to maintain No. three oil reservoir burnings to No. three oil reservoir perforated intervals from original gas injection well；
(53) open No. four oil reservoir perforated intervals of all wells, ground gas-liquid separator one line producing well, two wires are produced
The flue gas that well array goes out separates, and is recycled into No. four oil reservoirs to carry out flue gas from No. four oil reservoir perforated intervals of original gas injection well
Drive；
(54) one line producing wells, No. three oil reservoirs of two wires producing well, No. four oil reservoir perforated intervals produce；
Step 6: (layer of changing oil repeats step 3)
(61) when combustion front arrives near No. three oil reservoir perforated intervals of a line producing well, original gas injection well stops note
Gas, No. three oil reservoir perforated intervals of a line producing well stop producing, and change No. three oil reservoir perforated intervals from a line producing well into and inject sky
Gas burns away；
(62) flue gas discharged by two wires producing well by ground gas-liquid separator separates, and from original gas injection well and a line
No. four oil reservoir perforated intervals of producing well are recycled into No. four oil reservoirs to carry out flue gas flooding；
(63) No. three oil reservoirs of two wires producing well, No. four oil reservoir perforated intervals produce；
By that analogy.
In a better embodiment of the present invention, whole oil reservoir includes that more than two-layer or two-layer meet baked wheaten cake and flue gas
Driving the oil reservoir of screening criteria, in its screening criteria employing industry, disclosed parameter is carried out.
In a better embodiment of the present invention, between each adjacent oil reservoir in whole oil reservoir, there is continuous thickness and be more than
1 meter impermeable stablizes interlayer.
In a better embodiment of the present invention, described each packer is separately positioned on more than boundary at the bottom of each independent oil reservoir
The oil jacket annular space position of 1 meter neighbouring.
From the above mentioned, the method for combustion in situ of the present invention exploitation stratified deposit, in every mouthful of gas injection well with producing well pit shaft
Under enter demixing injection-production tubing string, and oil jacket annular space position near 1 meter arranges packer, to foot more than boundary at the bottom of each oil reservoir
Oil reservoir injects air and returns ground with flue gas via on a line producing well with maintenance foot oil reservoir burning, the deep fat of burning generation
Face, via injecting one, top oil reservoir or multiple oil reservoir after gas-liquid separator separates from gas injection well annular space, displacement crude oil is gone forward side by side
Enter two wires producing well, by that analogy, it is achieved the multilamellar fireflood of stratified deposit and gas drive synchronous development.The method is applicable to oil reservoir number
Amount is no less than thin oil and the heavy crude reservoir of all kinds of applicable combustion in situ exploitation of two-layer.There is advantages that
(1) present invention is in fireflood development process, and a large amount of flue gases that burning produces pass through ground together with residual air
Gas-liquid separator is recycled into top oil reservoir, and non-discharge ground, therefore avoiding substantial amounts of hydrogen sulfide, titanium dioxide that burning produces
The toxic gas environmental pollution such as sulfur, carbon monoxide, it is achieved that zero-emission；
(2) by flue gas re-injection, the waste heat that the waste gas that burning produces carries is made full use of, it is to avoid amount of heat loss
In air；Utilize this portion gas to carry out the displacement of reservoir oil to produce, save substantial amounts of gas drive gas, low-cost high-efficiency exploitation can be realized；
(3) for stratified deposit, the successively combustion in situ+flue gas re-injection layering gas drive development scheme of the present invention is used,
All some is burned off to avoid the crude oil in each oil reservoir, therefore can be prevented effectively from and cause substantial amounts of crude oil to lose.
Accompanying drawing explanation
The following drawings is only intended to, in schematically illustrating the present invention and explaining, not delimit the scope of the invention.Wherein:
Fig. 1: exploit well spacing and the step 2 thereof of the specific embodiment one of the method for stratified deposit for combustion in situ of the present invention
The schematic diagram that note is adopted；
Fig. 2: note the schematic diagram adopted in the step 3 for embodiment one；
Fig. 3: note the schematic diagram adopted in the step 4 for embodiment one；
Fig. 4: note the schematic diagram adopted in the step 5 for embodiment one；
Fig. 5: note the schematic diagram adopted in the step 6 for embodiment one；
Reference numeral:
The original gas injection well of 1-；2-mono-line producing well；3-two wires producing well；
Number oil reservoir of 11-；No. bis-oil reservoirs of 12-；No. tri-oil reservoirs of 13-；No. tetra-oil reservoirs of 14-；
15-perforated interval；16-packer；17-interlayer；
The demixing injection-production valve that 18-closes；The demixing injection-production valve that 19-opens；
Detailed description of the invention
In order to be more clearly understood from the technical characteristic of the present invention, purpose and effect, now comparison accompanying drawing illustrates this
Bright detailed description of the invention.
The present invention proposes the method for a kind of combustion in situ exploitation stratified deposit, and the method is at every mouthful of gas injection well and producing well
Enter demixing injection-production tubing string under in pit shaft, and oil jacket annular space position near 1 meter arranges packer more than boundary at the bottom of each oil reservoir, to
Foot oil reservoir injects air and burns with maintenance foot oil reservoir, and the deep fat that burning produces and flue gas are via on a line producing well
Returning ground, via injecting one, top oil reservoir or multiple oil reservoir after gas-liquid separator separates from gas injection well annular space, displacement is former
Oil also enters two wires producing well, by that analogy, it is achieved the multilamellar fireflood of stratified deposit and gas drive synchronous development.
Arrange in the present invention at least the vertical gas injection well of a bite producing well vertical with many mouthfuls and linearly order arrangement with group
Become flooding pattern；Many mouthfuls of producing wells are directed away from a direction referred to as line producing well successively of gas injection well, two wires producing well, three lines lifes
Produce well, four line producing wells, and so on；Between gas injection well and producing well, between producing well and producing well in plane apart
50-500 rice；Described gas injection well and producing well all enter to divide down in each independent oil reservoir perforation, gas injection well and producing well pit shaft
Layer injection-production column jacket, described gas injection well and producing well are at boundary's oil jacket ring near above at the bottom of each oil reservoir in addition to bottom oil reservoir
Empty position arranges packer, utilize demixing injection-production tubing string and packer with the use of, it is achieved monolayer opens and closes gas injection, and
Monolayer opens and closes and produces；Bottom oil reservoir becomes an oil reservoir, become the most successively No. two oil reservoirs, No. three oil reservoirs, No. four
Oil reservoir, and so on；Described packer is existing structure, and in its concrete technology employing industry, disclosed technique is carried out；Institute
In stating the concrete technology employing industry of demixing injection-production tubing string, disclosed technique is carried out.
With a specific embodiment, the method for the present invention is made an explanation below.
Embodiment one
The present embodiment one provides the method for a kind of combustion in situ exploitation stratified deposit, as it is shown in figure 1, this oil reservoir has four
Independent oil reservoir, foot oil reservoir, as an oil reservoir 11, is up followed successively by No. two oil reservoirs 13, No. four oil reservoirs 14 of 12, No. three oil reservoirs,
There is between each oil reservoir average the impermeable of thickness 1.5 meters continuously and stablize interlayer 17；The method comprises the following steps:
Step one:
As it is shown in figure 1, deployment well pattern, the perforating modes of gas injection well and producing well is set；The original note that a bite is vertical is set
Gas well 1 and two mouthfuls of vertical producing wells are to form linear flooding pattern；Wherein it is referred to as apart from the producing well that original gas injection well 1 is nearer
One line producing well 2, distance gas injection well producing well farther out is referred to as two wires producing well 3；Between gas injection well 1 and a line producing well 2, one
Between line producing well 2 and two wires producing well 3 plane at a distance of (horizontal range) be 100 meters；Described gas injection well 1 and a line producing well
2, two wires producing well 3 is all at each independent oil reservoir (that is: No. one oil reservoir～No. four oil reservoirs) perforation, forms corresponding perforated interval 15, note
Entering down demixing injection-production tubing string in gas well and producing well pit shaft, as it is shown in figure 1, wherein, 18 are corresponding demixing injection-production valve
The demixing injection-production valve closed, 19 is the demixing injection-production valve opened；The oil jacket annular space of about 1 meter more than boundary at the bottom of each oil reservoir
Position arranges packer 16；Utilize demixing injection-production tubing string and packer with the use of, it is possible to achieve monolayer opens and closes gas injection,
Monolayer can also be realized and open and close production；
Step 2: as shown in Figure 1；
(21) inject air from original gas injection well 1 to an oil reservoir perforated interval, utilize natural gas fired mode to light oil reservoir,
And persistently air injection is to maintain an oil reservoir burning, the highest injection rate of air is 20 ton day；
(22) flue gas one line producing well 2, two wires producing well 3 discharged by ground gas-liquid separator separates, and from former
No. two oil reservoir perforated intervals of beginning gas injection well 1 are recycled into No. two oil reservoirs to carry out flue gas flooding, and the highest gas injection speed of flue gas is 20
Ton day；
(23) one line producing wells, an oil reservoir of two wires producing well, No. two oil reservoir perforated interval synchronous production, the highest fluid produces
Going out speed is 30 ton day；
Step 3: as shown in Figure 2；
(31) when combustion front arrives near an oil reservoir perforated interval of a line producing well 2, original gas injection well 1 stops note
Gas, an oil reservoir perforated interval of a line producing well 2 stops producing, and changes an oil reservoir perforated interval from a line producing well 2 into and injects
Air burns away；
(32) flue gas discharged by two wires producing well 3 by ground gas-liquid separator separates, and from original gas injection well 1 and
No. two oil reservoir perforated intervals of line producing well 2 are recycled into No. two oil reservoirs to carry out flue gas flooding；
(33) oil reservoir of two wires producing well 3, No. two oil reservoir perforated intervals produce；
Step 4: as shown in Figure 3；
(41) when combustion front enters an oil reservoir perforated interval of two wires producing well 3, an oil reservoir perforation of all wells
Section is closed；
(42) No. three oil reservoir perforated intervals of original gas injection well 1 and two wires producing well 3 are opened, from original gas injection well 1 to No. three
Oil reservoir perforated interval injects air and lights oil reservoir, and continues air injection to maintain No. three oil reservoir burnings；
(43) flue gas one line producing well 2, two wires producing well 3 discharged by ground gas-liquid separator separates, and from former
No. two oil reservoir perforated intervals of beginning gas injection well 1 and a line producing well 2 are recycled into No. two oil reservoirs to carry out flue gas flooding；
(44) No. two oil reservoirs of two wires producing well 3, No. three oil reservoir perforated intervals recover the oil.
Step 5: as shown in Figure 4；
(51) when flue gas scurries into No. two oil reservoir perforated intervals of two wires producing well 3, No. two oil reservoir perforated intervals of all wells
Close；
(52) continue to inject air point to maintain No. three oil reservoir burnings to No. three oil reservoir perforated intervals from original gas injection well 1；
(53) open No. four oil reservoir perforated intervals of all wells, ground gas-liquid separator one line producing well 2, two wires are produced
The flue gas that well 3 is discharged separates, and is recycled into No. four oil reservoirs to carry out flue gas from No. four oil reservoir perforated intervals of original gas injection well 1
Drive；
(54) one line producing wells 2, No. three oil reservoirs of two wires producing well 3, No. four oil reservoir perforated intervals produce.
Step 6: as shown in Figure 5；
(61) when combustion front arrives near No. three oil reservoir perforated intervals of a line producing well 2, original gas injection well 1 stops note
Gas, No. three oil reservoir perforated intervals of a line producing well 2 stop producing, and change No. three oil reservoir perforated intervals from a line producing well 2 into and inject
Air burns away；
(62) flue gas discharged by two wires producing well 3 by ground gas-liquid separator separates, and from original gas injection well 1 and
No. four oil reservoir perforated intervals of line producing well 2 are recycled into No. four oil reservoirs to carry out flue gas flooding；
(63) No. three oil reservoirs of two wires producing well 3, No. four oil reservoir perforated intervals produce.
Above step is by that analogy.
The present embodiment uses above-mentioned steps and operating parameter, the combustion in situ of this stratified deposit of successful implementation and flue gas
Drive integration exploitation；Achieve burning gases zero-emission, it is to avoid environmental pollution；Compared with conventional fireflood exploitation, burning consumes
The crude oil fallen significantly reduces, and oil recovery factor improves 15%, and owing to utilizing gas and waste heat, cost of winning significantly reduces, than
Conventional fireflood decreases 1/3, it is achieved that the economical and efficient exploitation of this oil reservoir.
The foregoing is only the schematic detailed description of the invention of the present invention, be not limited to the scope of the present invention.Any
Those skilled in the art, equivalent variations done on the premise of without departing from the design of the present invention and principle and amendment, all
The scope of protection of the invention should be belonged to.
Claims (3)
1. a method for combustion in situ exploitation stratified deposit, the method at least comprises the following steps:
Step one: dispose well pattern, the perforating modes of gas injection well and producing well is set；
The vertical gas injection well of at least a bite producing well vertical with many mouthfuls is set and linearly sequentially arranges to form flooding pattern；Many mouthfuls
Producing well is directed away from the direction of gas injection well and is referred to as a line producing well, two wires producing well, three line producing wells, four lines productions successively
Well, and so on；In plane at a distance of 50-500 rice between gas injection well and producing well, between producing well and producing well；Described note
Gas well and producing well all enter down demixing injection-production tubing string in each independent oil reservoir perforation, gas injection well and producing well pit shaft, described
Oil jacket annular space position near above arranges packing on boundary at the bottom of each oil reservoir in addition to bottom oil reservoir for gas injection well and producing well
Device, utilize demixing injection-production tubing string and packer with the use of, it is achieved monolayer opens and closes gas injection, and monolayer opens and closes
Produce；Bottom oil reservoir becomes an oil reservoir, becomes No. two oil reservoirs, No. three oil reservoirs, No. four oil reservoirs the most successively, and with this type of
Push away；
Step 2:
(21) inject air from original gas injection well to an oil reservoir perforated interval and light oil reservoir, and continue air injection to maintain an oil
Grate firing burns；
(22) by ground gas-liquid separator, the flue gas that one line producing well, two wires producing well are discharged is separated, and from original gas injection
No. two oil reservoir perforated intervals of well are recycled into No. two oil reservoirs to carry out flue gas flooding；
(23) one line producing wells, an oil reservoir of two wires producing well, No. two oil reservoir perforated interval synchronous production；
Step 3:
(31) when combustion front arrives near an oil reservoir perforated interval of a line producing well, the stopping gas injection of original gas injection well, one
A number oil reservoir perforated interval of line producing well stops producing, and changes an oil reservoir perforated interval from a line producing well into and injects air continuation
Burning；
(32) flue gas discharged by two wires producing well by ground gas-liquid separator separates, and produces from original gas injection well and a line
No. two oil reservoir perforated intervals of well are recycled into No. two oil reservoirs to carry out flue gas flooding；
(33) oil reservoir of two wires producing well, No. two oil reservoir perforated intervals produce；
Step 4:
(41) when combustion front arrives an oil reservoir perforated interval of two wires producing well, or at the end of an oil reservoir burning, institute
The oil reservoir perforated interval having well is closed；
(42) No. three oil reservoir perforated intervals of original gas injection well and two wires producing well are opened, from original gas injection well to No. three oil reservoir perforations
Section is injected air and is lighted oil reservoir, and continues air injection to maintain No. three oil reservoir burnings；
(43) by ground gas-liquid separator, the flue gas that one line producing well, two wires producing well are discharged is separated, and from original gas injection
No. two oil reservoir perforated intervals of well and a line producing well are recycled into No. two oil reservoirs to carry out flue gas flooding；
(44) No. two oil reservoirs of two wires producing well, No. three oil reservoir perforated intervals recover the oil；
Step 5:
(51) at the end of flue gas scurries into No. two oil reservoir perforated intervals of two wires producing well, or No. two oil reservoirs productions, all wells
No. two oil reservoir perforated intervals are closed；
(52) continue to inject air point to maintain No. three oil reservoir burnings to No. three oil reservoir perforated intervals from original gas injection well；
(53) No. four oil reservoir perforated intervals of all wells are opened, by ground gas-liquid separator by a line producing well, two wires lines of producing wells
The flue gas gone out separates, and is recycled into No. four oil reservoirs to carry out flue gas flooding from No. four oil reservoir perforated intervals of original gas injection well；
(54) one line producing wells, No. three oil reservoirs of two wires producing well, No. four oil reservoir perforated intervals produce；
Step 6: layer of changing oil repeats step 3；
(61) when combustion front arrives near No. three oil reservoir perforated intervals of a line producing well, the stopping gas injection of original gas injection well, one
No. three oil reservoir perforated intervals of line producing well stop producing, and change No. three oil reservoir perforated intervals from a line producing well into and inject air continuation
Burning；
(62) flue gas discharged by two wires producing well by ground gas-liquid separator separates, and produces from original gas injection well and a line
No. four oil reservoir perforated intervals of well are recycled into No. four oil reservoirs to carry out flue gas flooding；
(63) No. three oil reservoirs of two wires producing well, No. four oil reservoir perforated intervals produce；
By that analogy.
2. the method for combustion in situ exploitation stratified deposit as claimed in claim 1, it is characterised in that: each phase in whole oil reservoir
There is between adjacent oil reservoir impermeable more than 1 meter of continuous thickness and stablize interlayer.
3. the method for combustion in situ exploitation stratified deposit as claimed in claim 1, it is characterised in that: described each packer is respectively
It is arranged on the oil jacket annular space position that 1 meter of more than boundary at the bottom of each independent oil reservoir is neighbouring.
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| CN105464619B (en) * | 2015-12-22 | 2017-12-19 | 中国石油天然气股份有限公司 | Well completion method for in-situ combustion ignition well |
| CN106761638B (en) * | 2016-12-15 | 2019-05-07 | 中国石油天然气股份有限公司 | Fire flooding and flue gas reinjection gravity flooding collaborative mining method for high-dip-angle heavy oil reservoir |
| CN113833444B (en) * | 2020-06-23 | 2023-08-22 | 中国石油天然气股份有限公司 | Fire exploitation method of thin layer and deep layer original heavy oil reservoir |
| CN113944450A (en) * | 2020-07-15 | 2022-01-18 | 中国石油化工股份有限公司 | Oil extraction method for single-layer fire flooding and multi-layer heating production of multi-layer heavy oil reservoir |
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