CN112065355A - Exploitation well pattern and heavy oil reservoir exploitation method of single horizontal well and comb-shaped horizontal well - Google Patents
Exploitation well pattern and heavy oil reservoir exploitation method of single horizontal well and comb-shaped horizontal well Download PDFInfo
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- 239000000295 fuel oil Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003921 oil Substances 0.000 claims abstract description 105
- 238000011161 development Methods 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims description 31
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 20
- 238000000605 extraction Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 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
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000010779 crude oil Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000000638 stimulation Effects 0.000 claims description 4
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000005065 mining 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
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035699 permeability 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]
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- 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 method for exploiting a well pattern and a heavy oil reservoir of a single horizontal well and a comb-shaped horizontal well. The development well pattern of the single horizontal well and the comb-shaped horizontal well comprises: the single horizontal well is used for injecting gas into an oil layer and is arranged in the oil layer and provided with a horizontal section; the comb-shaped horizontal well is used for discharging oil in the oil layer, the comb-shaped horizontal well 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, two sides of the main horizontal section are respectively and symmetrically provided with at least one branch horizontal section, and the horizontal sections are located 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 oil exploitation, in particular to a method for exploiting a well pattern and a heavy oil reservoir of a single horizontal well and a comb-shaped horizontal well.
Background
At present, the double-horizontal-well SAGD development technology is mature, but the development of a steam cavity finally formed by the double-horizontal-well SAGD development technology is limited, and an area between a well group 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 average embedded depth of the middle part of an oil reservoir is 225 m, the average thickness of an oil layer is 30 m, the oil reservoir is continuous in the longitudinal direction, 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 formation pressure is 2.5 MPa, the oil layer temperature is 14 ℃, and the crude oil viscosity is 40000 centipoises at 50 ℃. The oil field is put into a double horizontal well SAGD development test in 2008, the exploitation degree of the oil layer bottom area is low through microseism detection, and 30% of geological reserves cannot be exploited.
Therefore, the prior art has the problems of low oil layer exploitation degree and low final oil recovery rate.
Disclosure of Invention
The invention mainly aims to provide a method for exploiting a well pattern and a heavy oil reservoir of a single horizontal well and a comb-shaped horizontal well, so as to solve the problem of low oil reservoir exploitation degree in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a development well pattern of a single horizontal well and a comb-shaped horizontal well, comprising: the single horizontal well is used for injecting gas into an oil layer and is arranged in the oil layer and provided with a horizontal section; the comb-shaped horizontal well is used for discharging oil in the oil layer, the comb-shaped horizontal well 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, two sides of the main horizontal section are respectively and symmetrically provided with at least one branch horizontal section, and the horizontal sections are located 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 greater than or equal to 4 meters and less than or equal to 7 meters.
Further, the length of the horizontal section is equal to that of the main horizontal section, and the length of the horizontal section is greater than or equal to 400 meters and less than or equal to 1000 meters.
Further, the branch horizontal segments and the main horizontal segment are arranged in parallel in the horizontal direction at equal intervals, and the interval distance is 15-50 m.
Further, the number of the plurality of branch horizontal segments is 4 to 12.
Furthermore, the length of the branch horizontal section is equal to that of the main horizontal section, and the length of the branch horizontal section 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 a single horizontal well and a comb-shaped horizontal well in an oil layer; injecting steam into the single horizontal well and the comb-shaped horizontal well 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 a single horizontal well, so that the comb-shaped horizontal well can be continuously produced.
Further, the thickness of the oil layer is more 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 the formation temperature.
Further, in the steam huff and puff oil recovery mode, the periodic steam injection strength of a single horizontal well is 12-25 tons per meter; and/or the steam injection speed of a 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 a single horizontal well is greater than 50%.
Further, in the steam huff and puff oil extraction mode, the periodic steam injection strength of the comb-shaped horizontal well is 20-50 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 more than 50%.
Further, after the steam huff and puff oil extraction mode is used for oil extraction for 300 days to 600 days, the steam assisted gravity oil extraction mode is switched to oil extraction production.
Further, in the steam-assisted gravity oil recovery mode, the steam injection speed of a single horizontal well is 80 tons/day to 180 tons/day, and the extraction-injection ratio is 1.1 to 1.3.
By applying the technical scheme of the invention, the number of oil production well sections is increased and the oil production speed is improved 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, and meanwhile, the area between the wells at the bottom of an oil layer is effectively used, so that the oil layer utilization degree is improved, and the final recovery ratio of thick oil is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic structural view of a development pattern of a single horizontal well and a comb-shaped horizontal well in this 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 figures include the following reference numerals:
10. a single horizontal well; 11. a horizontal segment; 20. a comb-shaped horizontal well; 21. a main horizontal section; 22. a first branch horizontal segment; 23. a second branch horizontal segment; 24. a third branched 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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, 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.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
In order to solve the problem of low oil layer exploitation degree in the prior art, the invention provides a method for exploiting a well pattern and a heavy oil reservoir of a single horizontal well and a comb-shaped horizontal well.
The development well patterns of the single horizontal well and the comb-shaped horizontal well are applied to the exploitation method of the heavy oil reservoir.
As shown in fig. 1 to 3, the development well pattern of the single horizontal well and the comb-shaped horizontal well in the present embodiment includes a single horizontal well 10 for injecting gas into an oil reservoir 30, the single horizontal well 10 being disposed in the oil reservoir 30 and having a horizontal section 11; the comb-shaped horizontal well 20 is used for discharging oil in an 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, two sides of the main horizontal section 21 are respectively and symmetrically provided with at least one branch horizontal section, and the horizontal section 11 is located above the main horizontal section 21.
Above-mentioned development well pattern has increased the quantity of oil recovery well section through the mode of the main horizontal segment and a plurality of branch horizontal segments of interval and symmetrical arrangement pectination horizontal well in proper order along the horizontal direction, has improved oil recovery speed, makes the region between oil reservoir bottom well and the well effectively use simultaneously, has improved the oil reservoir and has used the degree to improve viscous crude ultimate recovery ratio.
The horizontal section 11 and the main horizontal section 21 in this embodiment are parallel in the vertical direction, and the distance between the horizontal section 11 and the main horizontal section 21 in the height direction is greater than or equal to 4 meters and less than or equal to 7 meters. Too large distance between the horizontal section 11 and the main horizontal section 21 in the height direction makes it difficult to form an oil drainage channel between a single horizontal well and a comb-shaped horizontal well. Too small 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, thereby causing steam channeling and affecting 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 mining efficiency can be ensured on the premise of reducing the cost.
The branch horizontal segments and the main horizontal segment 21 in this embodiment are arranged in parallel and at equal intervals in the horizontal direction, and the interval distance is 15 meters to 50 meters. The equally spaced and appropriately spaced distances allow the reservoir to be more fully exploited.
The number of the plurality of branched horizontal segments in the present embodiment is 4 to 12 in consideration of the relationship between the economic cost and the oil exploitation level. In the present embodiment, there are six branch horizontal segments, which are 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 section in this embodiment is equal to the length of the main horizontal section 21, and the length of the branch horizontal section is greater than or equal to 400 meters and less than or equal to 1000 meters, so as to ensure the mining efficiency on the premise of reducing the cost.
The main horizontal segment 21 and the branch horizontal segments in this embodiment are located 2 meters to 5 meters above the bottom of the reservoir 30, such that the main horizontal segment 21 and the branch horizontal segments are as close as possible to the bottom of the reservoir 30, resulting in maximum production of the reservoir 30.
Taking a certain heavy oil reservoir as an example, installing the development well pattern of the single horizontal well and the comb-shaped horizontal well in the heavy oil reservoir, wherein the comb-shaped horizontal well is installed 2 meters above the bottom of the oil reservoir, 8 branch horizontal sections are arranged in total, 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 the single horizontal well is arranged at a 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 a single horizontal well and a comb-shaped horizontal well in an oil layer; injecting steam into the single horizontal well and the comb-shaped horizontal well 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 a single horizontal well, so that the comb-shaped horizontal well can be continuously produced.
It should be noted that, when the heavy oil reservoir production method is applied, the thickness of the oil layer 30 is more than 15 m.
Also, when the heavy oil reservoir recovery method is applied, the distance between the upper surface of the oil reservoir 30 and the ground is 160 m to 1000 m.
Likewise, in applying the heavy reservoir recovery method, the oil layer 30 has a crude oil viscosity of greater than 50000 centipoise at the formation temperature.
Specifically, the middle embedded depth of the heavy oil reservoir in this embodiment is 600 meters on average, the oil layer thickness is 40 meters on average, the whole oil reservoir is a medium-thick bulk oil reservoir, and the crude oil viscosity is 30000 centipoise at 50 ℃.
When the heavy oil reservoir exploitation method is applied, in a steam huff and puff oil recovery mode, the periodic steam injection strength of a single horizontal well 10 is 12 tons to 25 tons per meter; the steam injection speed of a 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 quality of a single horizontal well 10 is greater than 50%.
In one embodiment, steam stimulation is performed simultaneously on a single horizontal well and a comb-shaped horizontal well. The steam injection intensity of a single horizontal well is 15 tons per meter, the steam injection speed is 200 tons per day, the well stewing time is 4 days, and the dryness of the well bottom is more than 50 percent.
When the heavy oil reservoir exploitation method is applied, in a steam huff and puff oil recovery mode, the periodic steam injection strength 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%.
Similarly, in the above embodiment, the steam injection strength of the comb-shaped horizontal well is 30 tons per meter, the steam injection speed is 350 tons per day, the soaking time is 7 days, and the dryness of the bottom of the well is more than 50%.
When the heavy oil reservoir exploitation method is applied, after the steam huff-puff oil recovery mode is used for oil recovery for 300-600 days, the steam huff-puff oil recovery mode is switched to the steam assisted gravity oil recovery mode for oil recovery production.
And after the steam huff and puff oil extraction mode is used for oil extraction for 300 days to 600 days, switching to a steam assisted gravity oil extraction mode for oil extraction production. After 500 days of production by adopting a steam huff-puff oil extraction mode, the steam huff-puff oil extraction mode is changed into a steam assisted gravity oil extraction mode for production, steam is continuously injected into a single horizontal well, the steam injection speed is 120 tons/day, the extraction-injection ratio is 1.2, the comb-shaped horizontal well is converted into production, and the oil extraction speed is controlled at 130 tons/day. The method can predict the ultimate recovery rate to be 75%, and the recovery rate can be improved by 20% compared with the SAGD method with double horizontal wells.
By adopting the production method, in the steam-assisted gravity oil extraction mode, the steam injection speed of the single horizontal well 10 is 80 tons/day to 180 tons/day, and the production-injection ratio is 1.1 to 1.3.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: through the mode along the main horizontal segment of horizontal direction interval in proper order and symmetrical arrangement pectination horizontal well and a plurality of branch horizontal segment, increased the quantity of oil recovery well section, improved oil recovery speed, make the region between oil reservoir bottom well and the well effectively use simultaneously, improved the oil reservoir and used the degree to improve viscous crude ultimate recovery ratio.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of 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 this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation 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, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A development well pattern of a single horizontal well and a comb-shaped horizontal well is characterized by comprising the following components:
a single horizontal well (10) for injecting gas into an oil formation (30), said single horizontal well (10) being disposed in said oil formation (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, two sides of the main horizontal section (21) are respectively and symmetrically provided with at least one branch horizontal section, and the horizontal section (11) is located above the main horizontal section (21).
2. The development well pattern of single horizontal well and comb-shaped horizontal well according to claim 1, characterized in that the horizontal section (11) is parallel to the main horizontal section (21) in the vertical direction, and the distance between the horizontal section (11) and the main horizontal section (21) in the height direction is greater than or equal to 4 meters and less than or equal to 7 meters.
3. The development well pattern of single horizontal well and comb-shaped horizontal well 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 greater than or equal to 400 meters and less than or equal to 1000 meters.
4. The development well pattern of single horizontal well and comb-shaped horizontal well according to claim 1, characterized in that the branch horizontal sections and the main horizontal section (21) are arranged in parallel and at equal intervals in the horizontal direction, and the interval distance is 15 meters to 50 meters.
5. The development well pattern for single and comb horizontal wells of claim 1 wherein the number of said plurality of horizontal branch segments is from 4 to 12.
6. The development well pattern of single horizontal wells and comb-shaped horizontal wells according to claim 1, wherein the length of the branch horizontal section is equal to the length of the main horizontal section (21), and the length of the branch horizontal section is greater than or equal to 400 meters and less than or equal to 1000 meters.
7. Development well pattern of single and comb horizontal wells according to claim 1, characterized in that the main horizontal section (21) and the branch horizontal sections are located 2 to 5 meters above the bottom of the reservoir (30).
8. A heavy oil reservoir exploitation method, characterized in that the heavy oil reservoir is exploited by using the development well pattern of the single horizontal well and the comb-shaped horizontal well as defined in any one of claims 1 to 7, and the heavy oil reservoir exploitation method comprises the following steps:
installing a development pattern of said single and comb horizontal wells in said reservoir (30);
injecting steam into the single horizontal well (10) and the 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 and 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), so that the comb-shaped horizontal well (20) can be continuously produced.
9. The heavy oil reservoir exploitation method according to claim 8, wherein the oil layer (30) has a thickness greater than 15 m.
10. The method for exploiting a heavy oil reservoir according to claim 8, wherein the distance between the upper surface of the oil layer (30) and the ground is 160 to 1000 m.
11. The method for recovering heavy oil reservoirs according to claim 8, wherein the oil layer (30) has a crude oil viscosity of more than 50000 centipoise at the formation temperature.
12. The heavy oil reservoir recovery method according to claim 8, wherein, in the steam stimulation oil recovery mode,
the periodic steam injection intensity of the single horizontal well (10) is 12-25 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.
13. The heavy oil reservoir recovery method according to claim 8, wherein, in the steam stimulation oil recovery mode,
the periodic steam injection strength of the comb-shaped horizontal well (20) is 20-50 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 more than 50%.
14. The heavy oil reservoir exploitation method according to claim 8, wherein after the steam stimulation oil recovery mode is used for oil recovery for 300-600 days, the steam assisted gravity oil recovery mode is switched to oil recovery production.
15. A method for producing a heavy oil reservoir according to claim 8, wherein, in the steam assisted gravity recovery mode,
the steam injection speed of the single horizontal well (10) is 80 tons/day to 180 tons/day, and the extraction-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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112963124A (en) * | 2021-02-23 | 2021-06-15 | 重庆万普隆能源技术有限公司 | Coal bed gas extraction method |
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