CN110965975A - Oil extraction method applied to oil exploration - Google Patents
Oil extraction method applied to oil exploration Download PDFInfo
- Publication number
- CN110965975A CN110965975A CN201911343505.7A CN201911343505A CN110965975A CN 110965975 A CN110965975 A CN 110965975A CN 201911343505 A CN201911343505 A CN 201911343505A CN 110965975 A CN110965975 A CN 110965975A
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- China
- Prior art keywords
- horizontal well
- oil
- well
- stage
- production
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000605 extraction Methods 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 230000005484 gravity Effects 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 25
- 238000005516 engineering process Methods 0.000 description 10
- 239000010779 crude oil Substances 0.000 description 6
- 238000010793 Steam injection (oil industry) Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010795 Steam Flooding Methods 0.000 description 1
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
-
- 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]
- E21B43/2408—SAGD in combination with other methods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
-
- 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
- E21B43/32—Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells
-
- 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses an oil extraction method applied to oil exploration, which comprises the following steps: 1) a horizontal well is arranged at the bottom of an oil layer, and a vertical well is arranged right above the toe end of the horizontal well; 2) fracturing the horizontal well; 3) sequentially carrying out a steam preheating stage, an ignition stage and a production stage, wherein in the steam preheating stage, a horizontal well adopts a preheating mode of long pipe injection and short pipe production, and a vertical well adopts low-pressure huff and puff production; 4) the horizontal well fireflood assisted gravity drainage is carried out on the fractured horizontal well, and the problems of small transverse (well spacing direction) spread range, low yield and the like of fireflood are solved.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to an oil extraction method applied to oil exploration.
Background
At present, the main technology for thick oil recovery is still steam injection recovery technology, including steam huff and puff, steam flooding and steam assisted gravity drainage technology, but the steam injection energy consumption is high, the economic and social benefits are poor, and the pressure for energy conservation and environmental protection is large.
In recent years, horizontal well fireflood assisted gravity drainage technology, called THAI technology (Toe heil air injection) abroad, was originally invented by malcol m. Horizontal well fireflood assisted gravity drainage means: the oil layer is ignited at the bottom of the well, then air is continuously injected, the combustion in-situ heat release is maintained, the modified crude oil is heated and cracked, the heated cracked crude oil is produced from the horizontal well along with the air and water under the action of gravity, and compared with the traditional steam injection oil production mode, the horizontal well fire flooding auxiliary gravity oil drainage technology has the following differences: 1) the fire flooding technology adopts inexhaustible air as an injection medium, and the air is directly combusted in an underground oil layer to release heat, so that the energy consumption is reduced; the required water is less, the water treatment cost is greatly reduced, the method conforms to the great trend of energy conservation and environmental protection, and has wide development prospect. 2) The air directly reacts with an underground coking zone (coke generated by crude oil cracking), and the heat is released locally, so that the high-efficiency utilization of heat is realized, and the heat loss caused by long-distance transmission is avoided. 3) The method has the function of crude oil upgrading, the API degree of the crude oil can be upgraded from 8-10 to about 15-18, and the transportation and treatment cost of the crude oil is reduced. 4) The method is suitable for wide oil reservoir conditions and is suitable for heavy oil and super heavy oil reservoirs with effective thickness of more than 10 m.
However, the horizontal well fire flooding assisted gravity drainage has the great defect, because the combustion coning of the fire flooding front edge along the direction of the horizontal shaft is fast, the risk that a fire wire protrudes into the horizontal shaft is high, the field implementation control difficulty is high, and in addition, the spread range of the fire flooding in the transverse direction (the well spacing direction) is small (20-30m), and an example of the economic and effective successful development of the single horizontal well fire flooding is still absent in the world at present.
Disclosure of Invention
Technical problem to be solved
In order to overcome the defects of the prior art, an oil extraction method applied to oil exploration is provided, and the problems of small spread range, low yield and the like of fire flooding in the transverse direction (well spacing direction) are solved.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides an oil extraction method applied to oil exploration, which comprises the following steps: 1) a horizontal well is arranged at the bottom of an oil layer, and a vertical well is arranged right above the toe end of the horizontal well; 2) fracturing the horizontal well; 3) sequentially carrying out a steam preheating stage, an ignition stage and a production stage, wherein in the steam preheating stage, a horizontal well adopts a preheating mode of long pipe injection and short pipe production, and a vertical well adopts low-pressure huff and puff production; 4) and performing horizontal well fire flooding assisted gravity drainage on the fractured horizontal well.
Further, the vertical well adopts an electric ignition mode or a chemical ignition mode.
Further, the fire flooding assistance in the step 4) is realized by injecting hot fluid into the horizontal well.
Further, the hot fluid is nitrogen at a temperature between 300 ℃ and 500 ℃.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
1) the well spacing can be enlarged, and the control reserve of a single well group is increased, so that the technical application range is wider, the effective thickness of an oil layer is more than 4m of thick oil, and the new technology can be considered;
2) the fracturing scale can be controlled, parameters such as the length of a seam, the width of the seam, the flow conductivity and the like are optimized, a hydro-thermal mechanical channel is formed after preheating, the fire flooding front edge can be effectively guided to expand transversely, and the fire flooding wave and the volume are increased;
3) due to the existence of horizontal cracks with high flow conductivity, the spread range of the fire flooding front edge is enlarged, the air injection capacity is improved, the oil extraction speed is correspondingly improved, the investment recovery is fast, and the risk of capital investment is reduced;
4) compared with single horizontal fireflood, the single horizontal well fireflood is fractured, the coning of the fireflood front edge along the direction of a horizontal shaft is weakened, the production operation is stable and safe, and the field implementation control difficulty is low.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An oil production method applied to oil exploration comprises the following steps: 1) a horizontal well is arranged at the bottom of an oil layer, and a vertical well is arranged right above the toe end of the horizontal well; 2) fracturing the horizontal well; 3) sequentially carrying out a steam preheating stage, an ignition stage and a production stage, wherein in the steam preheating stage, a horizontal well adopts a preheating mode of long pipe injection and short pipe production, and a vertical well adopts low-pressure huff and puff production; 4) and performing horizontal well fire flooding assisted gravity drainage on the fractured horizontal well.
Wherein the vertical well adopts an electric ignition mode or a chemical ignition mode; the fire flooding assistance in the step 4) is realized by injecting hot fluid into the horizontal well; the hot fluid is nitrogen at a temperature between 300 ℃ and 500 ℃.
According to the oil extraction method applied to oil exploration, the fracturing technology and the single horizontal well fire flooding assisted gravity drainage exploitation technology are combined, the dual advantages of fire flooding front edge expansion guided by horizontal fractures and gravity assisted drainage are fully exerted, and the heavy oil reservoir with the oil layer thickness larger than 4m can be economically and effectively developed.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (4)
1. An oil extraction method applied to oil exploration is characterized in that: the method comprises the following steps: 1) a horizontal well is arranged at the bottom of an oil layer, and a vertical well is arranged right above the toe end of the horizontal well; 2) fracturing the horizontal well; 3) sequentially carrying out a steam preheating stage, an ignition stage and a production stage, wherein in the steam preheating stage, a horizontal well adopts a preheating mode of long pipe injection and short pipe production, and a vertical well adopts low-pressure huff and puff production; 4) and performing horizontal well fire flooding assisted gravity drainage on the fractured horizontal well.
2. A method of oil recovery for use in oil exploration, as claimed in claim 1, wherein: the vertical well adopts an electric ignition mode or a chemical ignition mode.
3. A method of oil recovery for use in oil exploration, as claimed in claim 1, wherein: the fire flooding assistance in the step 4) is realized by injecting hot fluid into the horizontal well.
4. A method of oil recovery for use in oil exploration, as claimed in claim 3, wherein: the hot fluid is nitrogen at a temperature between 300 ℃ and 500 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343505.7A CN110965975A (en) | 2019-12-24 | 2019-12-24 | Oil extraction method applied to oil exploration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343505.7A CN110965975A (en) | 2019-12-24 | 2019-12-24 | Oil extraction method applied to oil exploration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110965975A true CN110965975A (en) | 2020-04-07 |
Family
ID=70036067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911343505.7A Pending CN110965975A (en) | 2019-12-24 | 2019-12-24 | Oil extraction method applied to oil exploration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110965975A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803014A (en) * | 2020-06-11 | 2021-12-17 | 中国石油天然气股份有限公司 | Horizontal well plugging method |
-
2019
- 2019-12-24 CN CN201911343505.7A patent/CN110965975A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803014A (en) * | 2020-06-11 | 2021-12-17 | 中国石油天然气股份有限公司 | Horizontal well plugging method |
| CN113803014B (en) * | 2020-06-11 | 2023-07-25 | 中国石油天然气股份有限公司 | Plugging method for horizontal well |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200407 |