CN107939373B - A kind of novel combustion in situ heavy oil development well pattern structure and method - Google Patents
A kind of novel combustion in situ heavy oil development well pattern structure and method Download PDFInfo
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- CN107939373B CN107939373B CN201810044185.4A CN201810044185A CN107939373B CN 107939373 B CN107939373 B CN 107939373B CN 201810044185 A CN201810044185 A CN 201810044185A CN 107939373 B CN107939373 B CN 107939373B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 46
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 20
- 239000000295 fuel oil Substances 0.000 title claims abstract description 11
- 238000011161 development Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 88
- 238000002347 injection Methods 0.000 claims abstract description 71
- 239000007924 injection Substances 0.000 claims abstract description 71
- 239000003921 oil Substances 0.000 claims abstract description 39
- 210000003296 saliva Anatomy 0.000 claims abstract description 10
- 239000010779 crude oil Substances 0.000 claims description 14
- 230000005484 gravity Effects 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000013508 migration Methods 0.000 claims description 5
- 230000005012 migration Effects 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 241000251468 Actinopterygii Species 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 210000000988 bone and bone Anatomy 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 5
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- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 238000010795 Steam Flooding Methods 0.000 description 2
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 2
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000204795 Muraena helena Species 0.000 description 1
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Classifications
-
- 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
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
-
- 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 invention discloses the well pattern structures and method of a kind of novel combustion in situ exploitation, using two mouthfuls of horizontal saliva Ping Shuan branch herringbone wells as producing well, dispose two mouthfuls of straight wells as gas injection well in two mouthfuls of horizontal saliva Ping Shuan branch herringbone well middle upper parts, upper side disposes two mouthfuls of blast pits respectively outside two mouthfuls of horizontal saliva Ping Shuan branch herringbone wells.Horizontal double branches herringbone well contains vertical section and horizontal segment, has lateral branching well at horizontal segment.Two mouthfuls of horizontal flat herringbone wells of saliva are arranged in parallel, and two mouthfuls of gas injection straight wells and four mouthfuls of blast pits are parallel to horizontal double branches herringbone well.The present invention proposes the laterally disposed Multilateral Wells in horizontal double branches' herringbone wells, the area of producing well covering oil reservoir can more be linked up, accurate design relative distance simultaneously, heat loss can be effectively reduced, and utilize the nitrogen in the gas and air after blast pit discharge burning, existing traditional combustion in situ well pattern can be alleviated, and easily there is a phenomenon where gas onlaps, improve recovery factor of heavy oil reservoir.
Description
Technical field
It is specifically a kind of using four branch's herringbone wells as producing well and one the present invention relates to oil-gas field development technical field
Arrange well pattern structure of the vertical well as injection well.
Background technique
Combustion in situ (in-situ combustion), also known as fireflood or original place are burnt, and are a kind of with great potential
Heavy crude heat extraction technical method, belong to heating exploitation technology.It is to make fuel using the part pyrolysis product of oil reservoir itself, constantly
Burning heat realizes burning in layer, to push in-place oil to producing well from gas injection well, realizes the purpose of raising recovery ratio.
Fireflood technology has steam drive, hot water flooding, flue gas flooding etc. along with complicated heat transfer, mass transport process and physicochemical change
A variety of withdrawal mechanisms.Fireflood oil displacement efficiency is very high, and laboratory experiment proves, own combustion zone residual oil saturation is almost nil, harvesting
Rate is up to 85%~90%；In the live fireflood scheme having been carried out, recovery ratio can also reach 50%~80%.
Existing viscous crude fireflood technology diabatic process: gas well midpoint fuel oil layer is also known as in a bite or several mouthfuls of gas injection wells
Afterwards, it by constantly injecting appropriate oxidant air or oxygen-enriched combustion-supporting to oil reservoir, forms the combustion front moved radially and is also known as firewire.
The heated viscosity reduction of crude oil in front of firewire, distillation, light oil, vapour and combustion product gases after distillation are driven onto front, leave and be not distilled
Heavy ingredient generate cracking at high temperature, decompose, last remaining pyrolysis product-coke is used as fuel, maintains oil reservoir continuation
It burns forward.At high temperature, oil-reservoir water includes that irreducible water, injection water and burning generate water, becomes steam, carries a large amount of heat
Front oil reservoir is passed to, and scrubs Crude Oil again.To form the complex process of an a variety of drivings, crude oil is driven onto life
Produce well.The pyrolysis product being burned off, about the 10%~15% of reserves.
Fireflood assisted gravity drainage techniques are on the basis of traditional straight well situ combustion technology, and improving producing well is level
Well shortens the heat propagation distance between producing well and injection well, gives full play to effect of the gravity in draining.Combustion in situ heat
Power oil recovery technique has worldwide carried out the experiment of fireflood assisted gravity drainage and oil few in number since using research
Field exploitation.As the Romanian oil field Suplacu determined to carry out commercialization exploitation using Top-down fireflood method in 1970.
As shown in Figure 1, being one of existing fireflood assisted gravity drainage techniques: Top-down fireflood technology.Top-
Down is new technology developed in recent years, and the hole pattern of the downward fireflood technology in top is, in top of oil horizon according to certain
Well spacing dispose the vertical gas injection well of a row, horizontal production well is deployed in oil reservoir bottom, and is located at the underface of gas injection well row.The party
Method combines fireflood technology with gravity drainage theory, can obtain preferable productivity effect.The disadvantages of this method are: not arranging
Gas well, once combustion front is broken through from net horizontal section, will result in a large amount of not burned crude oil with affected area can not be adopted
Out, region of bypassed oil is formed.Therefore, which is also faced with combustion front from level although fireflood vertical sweep efficiency can be improved
Well breaks through the reservoir risk to form a wide range of region of bypassed oil.Gas onlap phenomenon how is solved, and how to be reduced to a greater extent
Thermal losses is increased economic efficiency, and is that current this field needs the problem of furtheing investigate.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of novel combustion in situ heavy oil development well pattern structure, adapted to by design
The combustion in situ oil extraction methods of fish-bone horizontal well, and its best arrangement mode is adjusted, it can be reduced between producing well and injection well
Distance further reduces thermal losses, shortens the migration distance of crude oil in production, and proposes that a kind of energy alleviates existing tradition
The method that gas onlap phenomenon easily occurs for combustion in situ well pattern improves recovery factor of heavy oil reservoir.
The technical scheme is that
A kind of novel combustion in situ heavy oil development well pattern structure, including two mouthfuls of horizontal saliva Ping Shuan branch herringbone wells, two mouthfuls of gas injections are straight
Well, four mouthfuls of blast pits；Two mouthfuls of horizontal saliva Ping Shuan branch herringbone well is divided into horizontal double branches herringbone well one, horizontal double branches herringbone well
Two, two mouthfuls of gas injection straight wells are divided into gas injection straight well one, gas injection straight well two, and four mouthfuls of blast pits are divided into blast pit one, exhaust
Well two, blast pit three, blast pit four；Horizontal double branches herringbone well one and horizontal double branches herringbone well two are parallel to each other, institute
It is flat to state gas injection straight well one, the gas injection straight well two and horizontal double branches herringbone well one and horizontal double branches herringbone well two
It goes and equidistant, the blast pit one and the blast pit two are located on the outside of horizontal double branches herringbone well one, the blast pit
Three and the blast pit four be located at horizontal double two outside of branches' herringbone wells；Horizontal double branches herringbone well one and the level are double
Branch's herringbone well two is producing well, and the length of horizontal segment is 1000 meters, as main shaft section, the water of horizontal double branches herringbone well one
Horizontal well is as main shaft section one, and the horizontal well of horizontal double branches herringbone well two is as main shaft section two, the main shaft section one and the master
The two sides of well section two are equipped with multiple Multilateral Wells and form fish-bone supporting structure, and the Multilateral Wells of two sides are symmetrical structure.
Further, the main shaft section of horizontal double branches herringbone well one and horizontal double branches herringbone well two is located at oil
The bottom of hiding bottom, the gas injection straight well one and the gas injection straight well two is located at top of oil horizon；The gas injection straight well one and described
Spacing between gas injection straight well two is 400 meters；The gas injection straight well one and the gas injection straight well two and the main shaft section one and institute
Stating vertical range between main shaft section 2 42 is respectively 250 meters, the gas injection straight well one and the gas injection straight well two and Multilateral Wells it
Between vertical range be respectively 50 meters；Spacing between the blast pit one and the blast pit two is 400 meters, the blast pit
Three, the spacing between the blast pit four is 400 meters；Spacing between contiguous branch well is 400 meters.
Further, angle is 90 degree between the main shaft section and the Multilateral Wells, and the length of single Multilateral Wells is 200
Rice.
Further, the main shaft section of horizontal double branches herringbone well is equipped with casing, and slotted liner is used on casing
Complete well, the Multilateral Wells of two sides are open hole well.
A kind of development approach of novel combustion in situ viscous crude, includes the following steps:
S1, oxygen-containing gas is injected into oil reservoir by two mouthfuls of gas injection straight wells, is given up using blast pit by what combustion zone generated
Gas discharge, and the content of oxygen and the temperature of output gas in output gas are reduced as far as possible；The presence of blast pit makes output
The phenomenon that gas-liquid separately produces, and has alleviated gas onlap；
S2, horizontal double branches herringbone well are deployed in close to the position of oil reservoir bottom, are let out to maximally utilise gravity
The effect of oil, lateral branching well shorten the distance between main shaft section and gas injection straight well, further reduce thermal losses, shorten
The migration distance of crude oil in production, and reduce the cost of drilling new well；
In S3, combustion process, the combustion chamber of dispersion is formed around each gas injection straight well first, with combustion process into
Row, each small combustion chamber, which extends to the outside, is linked to be a continuous combustion chamber, and the crude oil of heating lets out following main shaft by gravity
Section, finally produces ground.
The invention has the beneficial effects that:
1, the proposition that the present invention innovates is using horizontal double branch's herringbone wells as the producing well in combustion in situ exploitation, side
Presence to Multilateral Wells reduces the distance between main shaft section and injection straight well, the area coverage in oil reservoir is increased, into one
Step reduces thermal losses, shortens the migration distance of crude oil in production, improves oil recovery factor；And it is timely using blast pit
The nitrogen in gas and air after discharge burning can alleviate existing traditional combustion in situ well pattern and showing for gas onlap easily occurs
As improving recovery factor of heavy oil reservoir；
2, two groups of horizontal double branches' herringbone wells are grouped together by the present invention, form four branch's herringbone wells, can allow middle part
The gas injection straight well divided completes the injection gas displacement of two sides, saves drilling hole number；
3, by data simulation and experiment, the optimized parameter of underground distance is designed, can reach and both meet
The effect of the displacement of reservoir oil, but can maximum distance keep well spacing, with the maximum oil displacement efficiency of least injection straight well realization.
Detailed description of the invention
Fig. 1 is the Top-down technology schematic diagram in existing fireflood assisted gravity drainage techniques；
Fig. 2 is the schematic diagram of well pattern structure provided by the present invention；
Fig. 3 is the detail view of horizontal double branches herringbone well.
In figure:
1 be horizontal double branches' herringbone well, 2 be gas injection straight well, 3 be blast pit, 4 be main well section, 5 be Multilateral Wells,
11 be horizontal double branches' herringbone wells one, 12 be horizontal double branches herringbone well two,
21 be gas injection straight well one, 22 be gas injection straight well two,
31 be blast pit one, 32 be blast pit two, 33 be blast pit three, 34 be blast pit four,
41 for main well section one, 42 be main well section two.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figures 2 and 3, a kind of novel combustion in situ heavy oil development well pattern structure, including two mouthfuls of horizontal saliva Ping Shuan branch fish-bones
1, two mouthful of well, 2, four mouthfuls of gas injection straight well blast pit 3；Two mouthfuls of horizontal saliva Ping Shuan branch herringbone well is divided into horizontal double branches herringbone well one
11, horizontal double branches' herringbone wells 2 12, two mouthfuls of gas injection straight wells are divided into gas injection straight well 1, gas injection straight well 2 22, and described four
Mouth blast pit is divided into blast pit 1, blast pit 2 32, blast pit 3 33, blast pit 4 34；Horizontal double branches herringbone well
One 11 are parallel to each other with horizontal double branches herringbone wells 2 12, the gas injection straight well 1, the gas injection straight well 2 22 and the water
Ping Shuan branch herringbone well 1 and horizontal double branch's herringbone wells 2 12 are parallel and equidistant, the blast pit 1 and the row
Gas well 2 32 is located at horizontal one 11 outside of double branches herringbone well, and the blast pit 3 33 and the blast pit 4 34 are located at water
2 12 outside of Ping Shuan branch herringbone well；Horizontal double branches herringbone well 1 and horizontal double branches herringbone well 2 12 are made a living
Well is produced, the length of horizontal segment is 1000 meters, and as main shaft section 4, the horizontal well of horizontal double branches herringbone well 1 is as main shaft
Section 1, the horizontal well of horizontal double branches herringbone well 2 12 is as main shaft section 2 42, the main shaft section 1 and the main shaft section
2 42 two sides are equipped with multiple Multilateral Wells 5 and form fish-bone supporting structure, and the Multilateral Wells 5 of two sides are symmetrical structure.
The main shaft section 4 of horizontal double branches herringbone well 1 and horizontal double branches herringbone well 2 12 is located at oil reservoir bottom
The bottom of portion, the gas injection straight well 1 and the gas injection straight well 2 22 is located at top of oil horizon；The gas injection straight well 1 and institute
Stating the spacing between gas injection straight well 2 22 is 400 meters；The gas injection straight well 1 and the gas injection straight well 2 22 and the main shaft
Vertical range is respectively 250 meters between section 1 and the main shaft section 2 42, the gas injection straight well 1 and the gas injection straight well
Vertical range between 2 22 and Multilateral Wells 5 is respectively 50 meters；Between between the blast pit 1 and the blast pit 2 32
Away from being 400 meters, the spacing between the blast pit 3 33, the blast pit 4 34 is 400 meters；Between between contiguous branch well 5
Away from being 400 meters.
Angle is 90 degree between the main shaft section 4 and the Multilateral Wells 5, and the length of single Multilateral Wells is 200 meters.
Horizontal well and Multilateral Wells technology all comparative maturities at present, but to realize exploitation of the combustion in situ to viscous crude, point
The length of Zhi Jing is more appropriate with the example above, too short to will cause if too long can influence transfer efficiency because of being short of power
In-place oil is difficult to input, and influences yield.
The main shaft section 4 of horizontal double branches herringbone well 1 is equipped with casing, and the complete well of slotted liner is used on casing,
The Multilateral Wells 5 of two sides are open hole well, use slotted liner that can effectively play supporting role, same phase on the casing of main shaft section 4
Than allowing crude oil that can there are more gaps to enter for common perforation, convenient for preferably exploitation, meanwhile, the Multilateral Wells 5 of naked eye can
To have reduced the difficulty of well, and in order to effectively realize fireflood, it is necessary to bigger permeable face, it can be maximum using naked eye structure
The raising production efficiency of change.
A kind of development approach of novel combustion in situ viscous crude, includes the following steps:
After the completion of drillng operation, oxygen-containing gas is passed through two mouthfuls by injection device and oil recovery mechanism needed for the arrangement of well site
Gas injection straight well 2 is injected into oil reservoir, is discharged using the exhaust gas that blast pit 3 generates combustion zone, and reduce output gas as far as possible
The content of middle oxygen and the temperature of output gas.The presence of blast pit 3 produces the gas-liquid of output separately, and it is super to have alleviated gas
The phenomenon that covering；
Horizontal double branches herringbone well 1 is deployed in close to the position of oil reservoir bottom, to maximally utilise gravity drainage
Effect, lateral branching well 5 shortens the distance between main shaft section 4 and gas injection straight well 2, further reduces thermal losses, contracts
The short migration distance of crude oil in production, and reduce the cost of drilling new well；
In combustion process, the combustion chamber of dispersion is formed around each gas injection straight well 2 first, with combustion process into
Row, each small combustion chamber, which extends to the outside, is linked to be a continuous combustion chamber, and the crude oil of heating lets out following main shaft by gravity
Section 4, finally produces ground.
The selection of above-mentioned distance then is passed through by flow field analysis, pit shaft statics and dynamic analysis, thermodynamic analysis
It crosses and calculates analysis and obtain, with the thick of the Canadian Murry oil-sand area Alberta Mc and the area Alberta Conklin
In case where oil is exploited, currently, this area is produced using routine THAI technology, averagely individual well oil-producing is daily
88m3, the temperature of produced fluid is 80~170 DEG C, and combustion front fltting speed is 0.14~0.28m/d, it is contemplated that recovery ratio is
60%, and by computer simulation, if to the block using well pattern structure designed by the present invention, due to the heating to stratum
Faster, it does not need again to producing well injection steam to maintain bottom hole temperature (BHT) after lighting a fire successfully, simulating the result obtained can be reduced
80% steam requirement is higher than the formation condition of 5000mPas in the region reservoir thickness bigger (20~40m), viscosity of crude
Under, it remains to reach horizontal well end using the initial combustion front of method of the invention, and since the region is horizontal branch well
Structure, if being designed to fish bone structure Multilateral Wells provided by the present invention, oil reservoir area coverage increases, and energy consumption and crude oil are adopted
Path reduction is flowed through when out, in conjunction with flooding method of the invention, simulating obtained estimated recovery ratio is 80-85%, significantly
Higher than current recovery ratio.
Structure of the invention is used simultaneously, maximum efficiency only may be implemented in combustion in situ heavy oil development, using other
Steam drive, filled drive, the modes such as chemical flooding, since its spacing is larger, and structure is more complex, and intermediate injection is straight
Well 2 will supply the main shaft section 4 of two sides simultaneously, and efficiency promotes effect compared with using the mode of traditional one-to-one displacement to be had
Limit.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (2)
1. a kind of novel combustion in situ heavy oil development well pattern structure, which is characterized in that including two mouthfuls of horizontal saliva Ping Shuan branch herringbone wells
(1), two mouthfuls of gas injection straight wells (2), four mouthfuls of blast pits (3)；Two mouthfuls of horizontal saliva Ping Shuan branch herringbone well is divided into horizontal double branches fish-bone
Well one (11), horizontal double branch's herringbone wells two (12), two mouthfuls of gas injection straight wells are divided into gas injection straight well one (21), gas injection straight well two
(22), four mouthfuls of blast pits are divided into blast pit one (31), blast pit two (32), blast pit three (33), blast pit four (34)；Institute
It states horizontal double branch's herringbone wells one (11) and horizontal double branch's herringbone wells two (12) is parallel to each other, the gas injection straight well one (21),
The gas injection straight well two (22) and horizontal double branch's herringbone wells one (11) and horizontal double branch's herringbone wells two (12) are flat
It goes and equidistant, the blast pit one (31) and the blast pit two (32) are located at horizontal double branch's herringbone wells one (11) outside
Side, the blast pit three (33) and the blast pit four (34) are located on the outside of horizontal double branch's herringbone wells two (12)；The level
Double branch's herringbone wells one (11) and horizontal double branch's herringbone wells two (12) are producing well, and the length of horizontal segment is 1000
Rice, as main shaft section (4), the horizontal well of horizontal double branch's herringbone wells one (11) is as main shaft section one (41), horizontal double branches fish
For the horizontal well of bone well two (12) as main shaft section two (42), the two sides of the main shaft section one (41) and the main shaft section two (42) are equal
Fish-bone supporting structure is formed equipped with 2 Multilateral Wells (5), the Multilateral Wells of two sides are symmetrical structure；
The main shaft section (4) of horizontal double branch's herringbone wells one (11) and horizontal double branch's herringbone wells two (12) is located at oil reservoir
The bottom of bottom, the gas injection straight well one (21) and the gas injection straight well two (22) is located at top of oil horizon；The gas injection straight well one
(21) spacing between the gas injection straight well two (22) is 400 meters；The gas injection straight well one (21) and the gas injection straight well two
(22) vertical range is respectively 250 meters between the main shaft section one (41) and the main shaft section two (42), the gas injection straight well
Vertical range between one (21) and the gas injection straight well two (22) and Multilateral Wells (5) is respectively 50 meters；The blast pit one
(31) spacing between the blast pit two (32) is 400 meters, between the blast pit three (33), the blast pit four (34)
Spacing be 400 meters；Spacing between contiguous branch well (5) is 400 meters；
Angle is 90 degree between the main shaft section (4) and the Multilateral Wells (5), and the length of single Multilateral Wells is 200 meters；
The main shaft section (4) of horizontal double branch's herringbone wells (1) is equipped with casing, and the complete well of slotted liner is used on casing,
The Multilateral Wells (5) of two sides are open hole well.
2. a kind of development approach of novel combustion in situ viscous crude well pattern structure as described in claim 1, includes the following steps:
S1, oxygen-containing gas is injected into oil reservoir by two mouthfuls of gas injection straight wells (2), is generated combustion zone using blast pit (3)
Exhaust gas discharge, and the content of oxygen and the temperature of output gas in output gas are reduced as far as possible；The presence of blast pit (3) to produce
The phenomenon that gas-liquid out separately produces, and alleviates gas onlap；
S2, horizontal double branch's herringbone wells (1) are deployed in close to the position of oil reservoir bottom, to maximally utilise gravity drainage
Effect, lateral branching well (5) shortens the distance between main shaft section (4) and gas injection straight well (2), further reduces heat waste
Consumption, shortens the migration distance of crude oil in production, and reduce the cost of drilling new well；
In S3, combustion process, the combustion chamber of dispersion is formed around each gas injection straight well (2) first, with combustion process into
Row, each small combustion chamber, which extends to the outside, is linked to be a continuous combustion chamber, and the crude oil of heating lets out following main shaft by gravity
Section (4), finally produces ground.
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| CN201810044185.4A CN107939373B (en) | 2018-01-17 | 2018-01-17 | A kind of novel combustion in situ heavy oil development well pattern structure and method |
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| CN110344798B (en) * | 2019-06-20 | 2021-08-03 | 中国石油天然气股份有限公司 | Gravity fireflood method for improving gravity fireflood regulation and control by utilizing horizontal exhaust well |
| CN110685668A (en) * | 2019-11-12 | 2020-01-14 | 重庆大学 | Simulation sample for heavy oil reservoir exploitation test |
| CN113250666B (en) * | 2020-02-11 | 2022-06-03 | 中国石油天然气股份有限公司 | Shallow heavy oil reservoir burning auxiliary steam huff and puff exploitation method |
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