CN112065355B - Well pattern development and heavy oil reservoir exploitation method for single horizontal well and comb-shaped horizontal well - Google Patents
Well pattern development and heavy oil reservoir exploitation method for single horizontal well and comb-shaped horizontal well Download PDFInfo
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- CN112065355B CN112065355B CN201911245070.2A CN201911245070A CN112065355B CN 112065355 B CN112065355 B CN 112065355B CN 201911245070 A CN201911245070 A CN 201911245070A CN 112065355 B CN112065355 B CN 112065355B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000000295 fuel oil Substances 0.000 title claims abstract description 26
- 238000011161 development Methods 0.000 title claims abstract description 22
- 239000003921 oil Substances 0.000 claims abstract description 104
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000000605 extraction Methods 0.000 claims description 24
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 20
- 238000011084 recovery Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 230000005484 gravity Effects 0.000 claims description 11
- 230000000737 periodic effect Effects 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 7
- 239000010779 crude oil Substances 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 2
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005465 channeling Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011981 development test Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
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- 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- 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
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- 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
- E21B43/2406—Steam assisted gravity drainage [SAGD]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
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Abstract
The invention provides a development well pattern of a single horizontal well and a comb-shaped horizontal well and a heavy oil reservoir exploitation method. The development well pattern of single horizontal well and comb-shaped horizontal well includes: the single horizontal well is used for injecting gas into the oil layer, is arranged in the oil layer and is provided with a horizontal section; the comb-shaped horizontal well is used for discharging oil in the oil layer, is arranged in the oil layer and is provided with a main horizontal section and a plurality of branch horizontal sections which are sequentially arranged at intervals along the horizontal direction, at least one branch horizontal section is symmetrically arranged on two sides of the main horizontal section respectively, and the horizontal sections are positioned above the main horizontal section. The invention solves the problem of low oil layer utilization degree in the prior art.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation, in particular to a development well pattern of a single horizontal well and a comb-shaped horizontal well and a heavy oil reservoir exploitation method.
Background
At present, the SAGD development technology of the double horizontal wells is mature, but the steam cavity finally formed by the SAGD development technology of the double horizontal wells is limited in development, and the area between well groups at the bottom of an oil layer cannot be effectively used, so that the utilization rate of the oil layer is low.
Taking an oil field as an example, the buried depth in the middle of the oil reservoir is 225 m on average, the thickness of the oil layer is 30 m on average, the longitudinal continuity is realized, the average porosity of the oil layer is 31.5%, the average oil layer permeability is 1780 millidarcy, the original oil saturation is 72%, the stratum pressure is 2.5 megapascals, the oil layer temperature is 14 ℃, and the crude oil viscosity is 40000 centipoise at 50 ℃. The oil field is put into a double horizontal well SAGD development test in 2008, the utilization degree of the oil field in the bottom area of the oil layer is low through microseism detection, and 30% of geological reserves are not utilized yet.
From this, the prior art has the problem that the oil reservoir utilization degree is low, so that the final recovery ratio of the oil reservoir is low.
Disclosure of Invention
The invention mainly aims to provide a development well pattern of a single horizontal well and a comb-shaped horizontal well and a heavy oil reservoir exploitation method, so as to solve the problem of low oil reservoir utilization degree in the prior art.
To achieve the above object, according to one aspect of the present invention, there is provided a development pattern of a single horizontal well and a comb-shaped horizontal well, comprising: the single horizontal well is used for injecting gas into the oil layer, is arranged in the oil layer and is provided with a horizontal section; the comb-shaped horizontal well is used for discharging oil in an oil layer, is arranged in the oil layer and is provided with a main horizontal section and a plurality of branch horizontal sections which are sequentially arranged at intervals along the horizontal direction, and at least one branch horizontal section is symmetrically arranged on two sides of the main horizontal section respectively and is positioned above the main horizontal section.
Further, the horizontal segment is parallel to the main horizontal segment in the vertical direction, and the distance between the horizontal segment and the main horizontal segment in the height direction is 4 meters or more and 7 meters or less.
Further, the length of the horizontal segment is equal to the length of the main horizontal segment, and the length of the horizontal segment is greater than or equal to 400 meters and less than or equal to 1000 meters.
Further, the branch horizontal sections are arranged in parallel with the main horizontal section in the horizontal direction at equal intervals, and the interval distance is 15 meters to 50 meters.
Further, the number of the plurality of branch horizontal segments is 4 to 12.
Further, the length of the branch horizontal segment is equal to the length of the main horizontal segment, and the length of the branch horizontal segment is greater than or equal to 400 meters and less than or equal to 1000 meters.
Further, the main horizontal section and the branch horizontal section are located 2 to 5 meters above the bottom of the oil layer.
According to another aspect of the present invention, there is provided a method for recovering a heavy oil reservoir, comprising: installing development well patterns of single horizontal wells and comb-shaped horizontal wells in an oil layer; steam is injected into a single horizontal well and a comb-shaped horizontal well of a development well pattern of the single horizontal well and the comb-shaped horizontal well in a periodic mode by adopting a steam huff-puff oil extraction mode; by adopting a steam-assisted gravity oil extraction mode, the comb-shaped horizontal well can be continuously produced by continuously injecting steam into a single horizontal well.
Further, the thickness of the oil layer is greater than 15 meters.
Further, the distance between the upper surface of the oil layer and the ground is 160 meters to 1000 meters.
Further, the oil layer has a crude oil viscosity greater than 50000 centipoise at formation temperature.
Further, in the steam huff and puff oil extraction mode, the periodic steam injection intensity of a single horizontal well is 12 tons to 25 tons per meter; and/or the steam injection speed of the single horizontal well is 200 tons/day to 400 tons/day; and/or the soaking time of a single horizontal well is 3 days to 8 days; and/or the bottom hole dryness of the single horizontal well is greater than 50%.
Further, in the steam huff and puff oil extraction mode, the periodic steam injection intensity of the comb-shaped horizontal well is 20 tons to 50 tons per meter; and/or the steam injection speed of the comb-shaped horizontal well is 250 tons/day to 500 tons/day; and/or the soaking time of the comb-shaped horizontal well is 5 days to 10 days; and/or the bottom hole dryness of the comb-shaped horizontal well is greater than 50%.
Further, after the oil extraction is carried out by using the steam huff-puff oil extraction mode for 300 to 600 days, the method is switched to the steam assisted gravity oil extraction mode for oil extraction production.
Further, in the steam assisted gravity oil extraction mode, the steam injection speed of a single horizontal well is 80 tons/day to 180 tons/day, and the mining and injection ratio is 1.1 to 1.3.
By adopting the technical scheme of the invention, the number of the oil extraction well sections is increased by sequentially and symmetrically arranging the main horizontal section and the plurality of branch horizontal sections of the comb-shaped horizontal well at intervals along the horizontal direction, the oil extraction speed is improved, meanwhile, the area between the bottom well and the well of the oil layer is effectively used, the oil layer use degree is improved, and the final recovery ratio of thickened oil is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic structural diagram of a development pattern of a single horizontal well and a comb-shaped horizontal well in the present embodiment;
FIG. 2 shows a schematic view of an angle of FIG. 1;
FIG. 3 shows a schematic view of another angle of FIG. 1;
wherein the above figures include the following reference numerals:
10. a single horizontal well; 11. a horizontal section; 20. comb-shaped horizontal wells; 21. a main horizontal section; 22. a first branch horizontal segment; 23. a second branch horizontal segment; 24. a third branch horizontal segment; 25. a fourth branch horizontal segment; 26. a fifth branch horizontal segment; 27. a sixth branch horizontal segment; 30. and (3) an oil layer.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.
In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.
In order to solve the problem of low oil layer utilization degree in the prior art, the invention provides a development well pattern of a single horizontal well and a comb-shaped horizontal well and a heavy oil reservoir exploitation method.
The development well patterns of the single horizontal well and the comb-shaped horizontal well are applied to the exploitation methods of heavy oil reservoirs.
As shown in fig. 1 to 3, the development patterns of the single horizontal well and the comb-shaped horizontal well in the present embodiment include a single horizontal well 10 for injecting gas into an oil layer 30, the single horizontal well 10 being disposed in the oil layer 30 and having a horizontal section 11; the comb-shaped horizontal well 20 is used for discharging oil in the oil layer 30, the comb-shaped horizontal well 20 is arranged in the oil layer 30 and is provided with a main horizontal section 21 and a plurality of branch horizontal sections which are sequentially arranged at intervals along the horizontal direction, at least one branch horizontal section is symmetrically arranged on two sides of the main horizontal section 21 respectively, and the horizontal section 11 is positioned above the main horizontal section 21.
According to the development well pattern, the number of the oil extraction well sections is increased by sequentially and symmetrically arranging the main horizontal sections and the plurality of branch horizontal sections of the comb-shaped horizontal well at intervals along the horizontal direction, the oil extraction speed is improved, meanwhile, the area between the bottom well and the well of the oil layer is effectively used, the oil layer using degree is improved, and therefore the final recovery ratio of thickened oil is improved.
The horizontal segment 11 in the present embodiment is parallel to the main horizontal segment 21 in the vertical direction, and the distance between the horizontal segment 11 and the main horizontal segment 21 in the height direction is 4 meters or more and 7 meters or less. Too large a distance between the horizontal segment 11 and the main horizontal segment 21 in the height direction makes it difficult to form a drainage channel between a single horizontal well and a comb-shaped horizontal well. Too small a distance between the horizontal section 11 and the main horizontal section 21 in the height direction can make the liquid level between the single horizontal well 10 and the comb-shaped horizontal well 20 difficult to control, and cause steam channeling, which affects the recovery ratio.
The length of the horizontal segment 11 in this embodiment is equal to the length of the main horizontal segment 21. Preferably, the length of the horizontal segment 11 is greater than or equal to 400 meters and less than or equal to 1000 meters, so that the exploitation efficiency can be ensured under the condition of reducing the cost.
The branch horizontal segments in this embodiment are disposed in parallel with the main horizontal segment 21 in the horizontal direction at equal intervals of 15 meters to 50 meters. The equally spaced arrangement and the appropriate spacing distance allow the reservoir to be more fully exploited.
The number of the plurality of branch horizontal segments in the present embodiment is 4 to 12 in consideration of the relationship between the economic cost and the degree of reservoir utilization. In this embodiment, there are six branch horizontal segments, which are respectively a first branch horizontal segment 22, a second branch horizontal segment 23, a third branch horizontal segment 24, a fourth branch horizontal segment 25, a fifth branch horizontal segment 26, and a sixth branch horizontal segment 27, and the specific arrangement is shown in fig. 1.
The length of the branch horizontal segment in this embodiment is equal to the length of the main horizontal segment 21, and the length of the branch horizontal segment is greater than or equal to 400 meters and less than or equal to 1000 meters, which is also to ensure the exploitation efficiency on the premise of reducing the cost.
The main and branch levels 21, 21 in this embodiment are located 2 to 5 meters above the bottom of the reservoir 30 so that the main and branch levels 21, 30 are as close as possible to the bottom of the reservoir 30 so that the reservoir 30 is maximally produced.
Taking a heavy oil reservoir as an example, the development well pattern of the single horizontal well and the comb-shaped horizontal well is arranged in the heavy oil reservoir, wherein the comb-shaped horizontal well is arranged at the position 2 meters above the bottom of an oil layer, the total number of the branch horizontal sections is 8, the equal distance between the branch horizontal sections is 15 meters, and the lengths of the main horizontal section and the branch horizontal sections are 1000 meters. The horizontal section of a single horizontal well is arranged at the position 5 meters above the main horizontal section of the comb-shaped horizontal well, and the length of the horizontal section of the single horizontal well is 1000 meters.
The heavy oil reservoir exploitation method comprises the following steps: installing development well patterns of single horizontal wells and comb-shaped horizontal wells in an oil layer; steam is injected into a single horizontal well and a comb-shaped horizontal well of a development well pattern of the single horizontal well and the comb-shaped horizontal well in a periodic mode by adopting a steam huff-puff oil extraction mode; by adopting a steam-assisted gravity oil extraction mode, the comb-shaped horizontal well can be continuously produced by continuously injecting steam into a single horizontal well.
In the case of applying the method for producing a heavy oil reservoir, the thickness of the oil layer 30 is greater than 15 meters.
Likewise, when the heavy reservoir recovery method is applied, the distance between the upper surface of the oil layer 30 and the ground is 160 meters to 1000 meters.
Likewise, when the heavy reservoir recovery method is applied, the oil layer 30 has a crude oil viscosity of greater than 50000 centipoise at the formation temperature.
Specifically, the middle buried depth of the heavy oil reservoir in the embodiment is 600 m on average, the thickness of the oil layer is 40 m on average, the whole oil reservoir is a medium-thick layer block oil reservoir, and the viscosity of crude oil at 50 ℃ is 30000 centipoise.
When the heavy oil reservoir exploitation method is applied, in a steam huff and puff oil exploitation mode, the periodic steam injection intensity of a single horizontal well 10 is 12 tons to 25 tons per meter; the steam injection speed of the single horizontal well 10 is 200 tons/day to 400 tons/day; the soaking time of the single horizontal well 10 is 3 days to 8 days; the bottom hole dryness of the single horizontal well 10 is more than 50%.
In one embodiment, steam stimulation is performed simultaneously for a single horizontal well and a comb-like horizontal well. The steam injection intensity of a single horizontal well is 15 tons per meter, the steam injection speed is 200 tons/day, the well stewing time is 4 days, and the bottom hole dryness is more than 50%.
When the heavy oil reservoir exploitation method is applied, in a steam huff and puff oil exploitation mode, the periodic steam injection intensity of the comb-shaped horizontal well 20 is 20 tons to 50 tons per meter; the steam injection speed of the comb-shaped horizontal well 20 is 250 tons/day to 500 tons/day; the soaking time of the comb-shaped horizontal well 20 is 5 days to 10 days; the bottom hole dryness of the comb-shaped horizontal well 20 is greater than 50%.
Also, in the above embodiment, the steam injection intensity of the comb-shaped horizontal well is 30 tons per meter, the steam injection speed is 350 tons/day, the soaking time is 7 days, and the bottom hole dryness is >50%.
When the heavy oil reservoir exploitation method is applied, after the oil exploitation is carried out by using a steam huff-puff oil exploitation mode for 300-600 days, the method is switched to a steam assisted gravity oil exploitation mode for oil exploitation production.
And after the oil extraction is carried out by using the steam huff and puff oil extraction mode for 300 to 600 days, switching to the steam assisted gravity oil extraction mode for oil extraction production. After the production of 500 days by adopting a steam huff and puff oil extraction mode, the production is changed into the production by adopting a steam assisted gravity oil extraction mode, steam is continuously injected into a single horizontal well, the steam injection speed is 120 tons/day, the injection ratio is 1.2, the comb-shaped horizontal well is changed into the production, and the oil extraction speed is controlled at 130 tons/day. The method predicts that the final recovery ratio can reach 75 percent, and compared with the double-horizontal well SAGD method, the recovery ratio can be improved by 20 percent.
By adopting the exploitation method, in the steam assisted gravity oil exploitation mode, the steam injection speed of the single horizontal well 10 is 80 tons/day to 180 tons/day, and the exploitation ratio is 1.1 to 1.3.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the main horizontal sections and the plurality of branch horizontal sections of the comb-shaped horizontal well are sequentially and symmetrically arranged along the horizontal direction, so that the number of oil production well sections is increased, the oil production speed is increased, meanwhile, the area between the bottom wells of the oil layer is effectively used, the oil layer using degree is increased, and the final recovery ratio of thickened oil is improved.
It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. The heavy oil reservoir exploitation method is characterized in that a exploitation well pattern of a single horizontal well and a comb-shaped horizontal well is adopted to exploit the heavy oil reservoir, and the exploitation well pattern of the single horizontal well and the comb-shaped horizontal well comprises:
-a single horizontal well (10) for injecting gas into an oil reservoir (30), the single horizontal well (10) being arranged in the oil reservoir (30) and having a horizontal section (11);
the comb-shaped horizontal well (20) is used for discharging oil in the oil layer (30), the comb-shaped horizontal well (20) is arranged in the oil layer (30) and is provided with a main horizontal section (21) and a plurality of branch horizontal sections which are sequentially arranged at intervals along the horizontal direction, at least one branch horizontal section is symmetrically arranged on two sides of the main horizontal section (21) respectively, and the horizontal section (11) is positioned above the main horizontal section (21); -said horizontal segment (11) is vertically parallel to said main horizontal segment (21); the branch horizontal sections are arranged in parallel with the main horizontal section (21) in the horizontal direction at equal intervals, and the length of the branch horizontal sections is equal to the length of the main horizontal section (21);
the heavy oil reservoir exploitation method comprises the following steps:
installing a development pattern of the single horizontal well and comb-shaped horizontal wells in the oil layer (30);
steam is injected into a single horizontal well (10) and a comb-shaped horizontal well (20) of the development well pattern of the single horizontal well and the comb-shaped horizontal well in a periodic mode by adopting a steam huff-puff oil extraction mode;
and a steam assisted gravity oil extraction mode is adopted, and steam is continuously injected into the single horizontal well (10) to enable the comb-shaped horizontal well (20) to be continuously produced.
2. The heavy oil reservoir production method according to claim 1, characterized in that the distance between the horizontal section (11) and the main horizontal section (21) in the height direction is 4 meters or more and 7 meters or less.
3. The heavy oil reservoir production method according to claim 1, characterized in that the length of the horizontal section (11) is equal to the length of the main horizontal section (21), and the length of the horizontal section (11) is 400 meters or more and 1000 meters or less.
4. A method of heavy oil recovery according to claim 1, characterized in that the branch horizontal section is spaced from the main horizontal section (21) by a distance of 15 to 50 meters.
5. The method of claim 1, wherein the number of the plurality of branch horizontal segments is 4 to 12.
6. The method of producing heavy oil reservoirs according to claim 1, wherein the length of the branched horizontal segment is 400 meters or more and 1000 meters or less.
7. A method of recovering a heavy oil reservoir according to claim 1, characterized in that the main horizontal section (21) and the branch horizontal section are located 2 to 5 meters above the bottom of the oil reservoir (30).
8. The method of recovering a heavy oil reservoir according to claim 1, wherein the thickness of the oil layer (30) is greater than 15 meters.
9. The method of recovering heavy oil reservoirs according to claim 1, wherein the distance between the upper surface of the oil layer (30) and the ground is 160 to 1000 meters.
10. The heavy reservoir recovery method of claim 1, wherein the oil layer (30) has a crude oil viscosity greater than 50000 centipoise at formation temperature.
11. The method of claim 1, wherein in the steam-huff-puff oil recovery method,
the periodic steam injection intensity of the single horizontal well (10) is 12 tons to 25 tons per meter; and/or
The steam injection speed of the single horizontal well (10) is 200 tons/day to 400 tons/day; and/or
The soaking time of the single horizontal well (10) is 3 days to 8 days; and/or
The bottom hole dryness of the single horizontal well (10) is more than 50 percent.
12. The method of claim 1, wherein in the steam-huff-puff oil recovery method,
the periodic steam injection strength of the comb-shaped horizontal well (20) is 20 tons to 50 tons per meter; and/or
The steam injection speed of the comb-shaped horizontal well (20) is 250 tons/day to 500 tons/day; and/or
The soaking time of the comb-shaped horizontal well (20) is 5 days to 10 days; and/or
The bottom hole dryness of the comb-shaped horizontal well (20) is greater than 50%.
13. The method of claim 1, wherein the steam assisted gravity oil recovery is switched to oil recovery after the oil recovery is performed using the steam huff and puff oil recovery for 300 to 600 days.
14. The method of claim 1, wherein, in the steam assisted gravity recovery method,
the steam injection speed of the single horizontal well (10) is 80 tons/day to 180 tons/day, and the mining and injection ratio is 1.1 to 1.3.
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| CN201911245070.2A CN112065355B (en) | 2019-12-06 | 2019-12-06 | Well pattern development and heavy oil reservoir exploitation method for single horizontal well and comb-shaped horizontal well |
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| CN109838224A (en) * | 2017-11-28 | 2019-06-04 | 中国石油天然气股份有限公司 | Method for exploiting super-thick oil by combining auxiliary oil production well and SAGD (steam assisted gravity drainage) |
| CN108643960A (en) * | 2018-05-21 | 2018-10-12 | 河南工程学院 | A kind of ground region band coal mine gas extinction technique |
| CN108952796B (en) * | 2018-07-25 | 2019-11-05 | 中煤科工集团重庆研究院有限公司 | Comb-shaped bottom plate through-layer drilling fracturing permeability-increasing-based modular extraction method |
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