CN1888381A - Deep low penetrating thin oil reservoir fire flooding oil production firing method - Google Patents
Deep low penetrating thin oil reservoir fire flooding oil production firing method Download PDFInfo
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- CN1888381A CN1888381A CN 200610047266 CN200610047266A CN1888381A CN 1888381 A CN1888381 A CN 1888381A CN 200610047266 CN200610047266 CN 200610047266 CN 200610047266 A CN200610047266 A CN 200610047266A CN 1888381 A CN1888381 A CN 1888381A
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Abstract
The present invention relates to a deep-layer low-permeability thin oil reservoir fire-flooding oil-producing firing method, belonging to the field of oil well fire-flooding oil production technology. It is characterized by that said invention utilizes the combustion drive principle and adopts a high-pressure air injection process to inject the 38MP high-pressure air into single horizon of oil well and drive oil reservoir to implement preheat so as to form a combustion zone and a combustion wall, so that it can make N2 contained in oil reservoir, CO2 and water be mixed and combusted, and the coke cracked hydrocarbon, steam and light hydrocarbon can be produced and a low-temperature oil-water zone is formed, then because the combustion temperature is lowered, the crude oil positioned in the pressure-reduced zone can be recovered in production well.
Description
Technical field:
The present invention relates to a kind of deep low penetrating thin oil reservoir fire flooding oil production firing method, belong to oil well fire flood technology type.
Background technology:
Fireflood oil reservoir and other method difference are that it is to utilize a part of heavy composition in the oil reservoir to do fuel, and constantly heat is given birth in burning, and crude oil is displaced in oil reservoir, and therefore, it is also referred to as the fire flood method.
World's fire flood at present mainly concentrates on states such as the U.S., Romania and Canada, the oil reservoir produced a large amount of crude oil of light oil that fire flood can be crossed from water drive really, successful fireflood recovery ratio can reach 50-80%, and is mainly used in the shallow-layer oil density greater than 0.9 gram/cm in Xinjiang, triumph, the Liaohe Oil Field of China
3Inspissated pool, and above-mentioned oil reservoir lithological characteristic mostly is the reservoir of permeability greater than 30MD, and still is blank to the fireflood of deep low-permeability ligh-oil reservoir.In addition in view of exploitation still faces two hang-ups to thin oil both at home and abroad at present, the one, the thin oil oil well in the oil field oil recovery block is owing to adopt the most waterflooding extractions of conventional oil production method to arrive high water-cut stage, recovery ratio is descended, in addition for the hyposmosis deep layer ligh-oil reservoir in a large amount of oils in place, because technical reason can't be employed exploitation so far.
Summary of the invention:
Purpose of the present invention is in order to overcome above-mentioned shortcoming, and a kind of deep low penetrating thin oil reservoir fire flooding oil production firing method that provides, utilize this method to exploit less than the low permeability reservoir of 30MD to 2000 meters following permeabilities of well depth, recovery ratio is improved, also can improves 15-20% in oil reservoir reserves recovery ratio under high aqueous conditions.
Technical solution of the present invention:
Be the task of realizing that the present invention proposes, a kind of deep low penetrating thin oil reservoir fire flooding oil production firing method involved in the present invention is to realize like this.At first inject by the single oil reservoir high pressure 38MPa of the oil well steam injecting pipe in the deep low-permeability ligh-oil reservoir in gas injection well, utilize formation temperature pressure-air more than 70 ℃, drive oil reservoir and carry out preheating, form an auto-ignition combustion district and burning wall, make the N in the oil reservoir content thus
2, O
2Burn with oily mixed phase, thereby produce coke, crackene and steam, light hydrocarbon, form a profit band and along with the propelling of the horizontal interface of oil reservoir, reservoir temperature is risen to 315 ℃ of-480 ℃ of scopes from 70 ℃ reduces to about 100 ℃ more gradually, in the time of in the producing well in arriving once decompression band position, thus with the crude oil extraction ground in the stratum.
Described hyposmosis ligh-oil reservoir, its buried depth are below 2000 meters, and its oil reservoir lithology permeability is less than 30MD, and reservoir temperature is greater than 70 ℃, and oil density is less than 0.9 gram/cm
3Below, and the oil reservoir original formation pressure should be greater than CO in the rock stratum
2Solution presasure and N
2Miscible pressure value, gas injection pressure value remain on oil reservoir and crack the following 5MPa of pressure and be advisable single oil reservoir that described igniting oil layer section is or open-hole horizontal well section.
The advantage that the present invention compared with prior art has is:
Because the injection pressure when the present invention utilizes the combustion drive principle that the bore hole low permeability reservoir (permeability less than 30MD) of deep layer below 2000 meters adopted high pressure air injection and injection is greater than the CO of reservoir
2Solution presasure is wetting phase pressure and N
2The gas miscible pressure, thus make air in the low permeability reservoir along with the heating of injecting the stratum is elevated the temperature, so that cause airborne oxygen to mix generation spontaneous ignition better with oil in the stratum.In addition owing to the N that is present in the deep reservoirs
2, CO
2Be basic burning gases, in the very low reservoir of permeability, be difficult for leaving, so they are easy to mix with formation crude oil and utilize this characteristic just can improve the recovery ratio of deep low-permeability oil reservoir, improve the recovery ratio purpose thereby reach incremental oil production.
Description of drawings:
Figure is an ignition mechanism displacement of reservoir oil schematic diagram of the present invention.
Among the figure by 1, gas injection well, 2, producing well, 3, the combustion zone, 4, the burning wall, 5, the profit band, 6, once the decompression band is formed.
The specific embodiment:
The present invention is provided by following examples, below in conjunction with accompanying drawing the present invention is described further.
Embodiment 1:
Among the figure, the present invention utilizes the miscible displacement of reservoir principle of thin oil underground low temperature oxidizing fire, when carrying out the ligh-oil reservoir fire flood lighted a fire, at first will use model to inject pressure-air as WV12 type 38MP pressure fan by the exposed single oil reservoir of oil well gas injecting pipe in gas injection well 1 in the hyposmosis thin oil is hidden drives oil reservoir and carries out preheating, when in well, forming a combustion zone 3 and burning wall 4, in this section through the surplus materials in the rock gap after the burning be content less than 25% heavy hydrocarbon and rock salt crystal and air, continue to promote the N in the oil reservoir
2, CO
2Burn with water, and produce coke, crackene and steam and some light hydrocarbon material have formed profit band 5, this profit band and along with the propelling of oil reservoir forward position interface, make reservoir temperature after 315 ℃ of-480 ℃ of scopes, reduce to about 100 ℃ more gradually, in the time of in arriving the producing well of being with the position that once reduces pressure, thus with the crude oil extraction ground in the stratum.
Embodiment 2:
The deeply buried reservoir degree of its well depth generally is controlled at below 2000 meters during the invention process, and reservoir temperature is greater than 70 ℃, and original formation pressure should be greater than CO in the rock stratum
2Solution presasure and N
2Miscible pressure value, injection pressure value remain on oil reservoir and crack the following 5MPa of pressure and be advisable.
It is the N that makes after single oil reservoir is lighted a fire in the oil reservoir in order to remain on that above-mentioned condition is selected
2And CO
2Can give full play to combustion-supporting effect, can keep fire flood burning condition under the low-temperature condition like this and make the burning wall can constantly promote the extraction in the producing well of underground crude oil again.
In addition, the igniting oil reservoir of indication of the present invention is exposed oil reservoir, as long as could implement the process of the high-pressure gas injection thin oil displacement of reservoir oil of overall process with this understanding.
Claims (2)
1, a kind of deep low penetrating thin oil reservoir fire flooding oil production firing method, it is characterized in that: described ignition method at first will be by using model to utilize the pressure-air of formation temperature more than 70 ℃ to drive oil reservoir as WV12 type pressure fan injection pressure 38MP to the exposed single oil reservoir of gas injection well (1) in the hyposmosis ligh-oil reservoir and carrying out preheating, when the OIH layer forms combustion zone (3) and burning wall (4), make the N in the oil reservoir content thus
2, O
2Burn with oily mixed phase water, thereby produce coke, crackene and steam, light hydrocarbon, and form a profit band (5), propelling along with the horizontal interface of oil reservoir, reservoir temperature rises to 315 ℃ of-480 ℃ of scopes from 70 ℃ and reduces to about 100 ℃ more gradually, when arriving once decompression band (6) position, crude oil is from the interior extraction of producing well (2) ground.
2, a kind of deep low penetrating thin oil reservoir fire flooding oil production firing method is characterized in that: described hyposmosis ligh-oil reservoir, its buried depth be below 2000 meters, and its oil reservoir lithology permeability is less than 30MD, and reservoir temperature is greater than 70 ℃, oil density 0.9 gram/cm
3Below, and the oil reservoir original formation pressure is greater than CO in the rock stratum
2Solution presasure and N
2Miscible pressure value, gas injection pressure value remain on oil reservoir and crack the following 5MPa of pressure and be advisable, and described igniting oil layer section is exposed oil reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610047266 CN1888381A (en) | 2006-07-19 | 2006-07-19 | Deep low penetrating thin oil reservoir fire flooding oil production firing method |
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| CN 200610047266 CN1888381A (en) | 2006-07-19 | 2006-07-19 | Deep low penetrating thin oil reservoir fire flooding oil production firing method |
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| CN1888381A true CN1888381A (en) | 2007-01-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864938A (en) * | 2010-03-23 | 2010-10-20 | 邓惠荣 | Underground ignition technology of combustion drive oil layer by injecting steam |
| CN102606117A (en) * | 2012-04-05 | 2012-07-25 | 中国石油天然气股份有限公司 | Air nitrogen alternate flooding exploitation method for middle-deep low-permeability thin oil reservoir |
| CN103912252A (en) * | 2014-03-13 | 2014-07-09 | 中国石油大学(北京) | Wet type combustion huff-puff oil extraction method |
| CN103939072A (en) * | 2014-05-07 | 2014-07-23 | 邓晓亮 | Liquid oxygen strong-stimulation ignition air-driving high temperature pyrolyzing mixed-phase gas composite oil driving technology |
| CN109174933A (en) * | 2018-08-28 | 2019-01-11 | 山东碧泉环境工程技术有限公司 | A kind of heat reinforcing oil skimming well repair system of underground water LNAPL pollution processing |
-
2006
- 2006-07-19 CN CN 200610047266 patent/CN1888381A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864938A (en) * | 2010-03-23 | 2010-10-20 | 邓惠荣 | Underground ignition technology of combustion drive oil layer by injecting steam |
| CN101864938B (en) * | 2010-03-23 | 2014-04-09 | 邓惠荣 | Underground ignition technology of combustion drive oil layer by injecting steam |
| CN102606117A (en) * | 2012-04-05 | 2012-07-25 | 中国石油天然气股份有限公司 | Air nitrogen alternate flooding exploitation method for middle-deep low-permeability thin oil reservoir |
| CN102606117B (en) * | 2012-04-05 | 2014-11-05 | 中国石油天然气股份有限公司 | Air nitrogen alternate flooding exploitation method for middle-deep low-permeability thin oil reservoir |
| CN103912252A (en) * | 2014-03-13 | 2014-07-09 | 中国石油大学(北京) | Wet type combustion huff-puff oil extraction method |
| CN103939072A (en) * | 2014-05-07 | 2014-07-23 | 邓晓亮 | Liquid oxygen strong-stimulation ignition air-driving high temperature pyrolyzing mixed-phase gas composite oil driving technology |
| CN109174933A (en) * | 2018-08-28 | 2019-01-11 | 山东碧泉环境工程技术有限公司 | A kind of heat reinforcing oil skimming well repair system of underground water LNAPL pollution processing |
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Open date: 20070103 |