CN104389571B - A kind of method that combustion in situ exploits monoclinal structure oil reservoir - Google Patents
A kind of method that combustion in situ exploits monoclinal structure oil reservoir Download PDFInfo
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- CN104389571B CN104389571B CN201410587525.XA CN201410587525A CN104389571B CN 104389571 B CN104389571 B CN 104389571B CN 201410587525 A CN201410587525 A CN 201410587525A CN 104389571 B CN104389571 B CN 104389571B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/40—Separation associated with re-injection of separated materials
Abstract
A kind of method that the present invention exploits monoclinal structure oil reservoir for combustion in situ, step include：(1) dispose well pattern；(2) from gas injection well oil pipe to oil reservoir air injection, light oil reservoir displacement crude oil；(3) deep fat for producing is returned on the oil pipe with flue gas by producing well；(4) flue gas injects oil reservoir from gas injection well oil jacket annular space Jing after gas-liquid separator separates；(5) when live wire is burned to downwards a line producing well perforated interval, gas injection well is changed to flue gas reinjection well, and a line producing well is changed to fireflood gas injection well；(6) from a line producing well oil pipe to oil reservoir air injection, the deep fat of generation is returned on the oil pipe with flue gas via two, three line producing wells, then flue gas is refilled oil reservoir from original gas injection well oil jacket annular space and oil pipe.The present invention forms artificial gas cap using flue gas re-injection, realizes flue gas zero, reduces injection air capacity and running cost, the non-producing reserves of periptery of being burnt using artificial gas cap effective displacement, improves oil recovery.
Description
Technical field
The present invention is, with regard to a kind of combustion in situ oil production method, more particularly to a kind of to be used for high dip angle thin oil and heavy crude reservoir
Develop the method that monoclinal structure oil reservoir is exploited with the combustion in situ for improving crude oil recovery ratio.
Background technology
For high dip angle monoclinal structure oil reservoir of the oil reservoir structure dip more than or equal to 7 °, opened using conventional combustion in situ
Send out, during from structural high part to lower location of the structure air injection, as atmospheric density is relatively low, in injection process, air is automatically to construction
High-order bit is migrated, therefore will backfill burned region, causes large quantity of air to waste, and due to the gradually expansion of burned region, needs
Air injection speed also to be continuously increased therewith, cause running cost to improve constantly；And if from lower location of the structure air injection, then
As air is migrated from trend structural high part, live wire is caused to be difficult to control to, combustion in situ risk is larger.Therefore, for construction
How high dip angle oil reservoir, reduce air injection rate, reduces cost of winning, is that conventional combustion in situ needs the urgent key for solving to ask
Topic.
Thus, by the experience and practice for being engaged in relevant industries for many years, the present inventor proposes that a kind of combustion in situ exploitation is single
The method of oblique structural oil pool, to overcome the defect of prior art.
The content of the invention
It is an object of the invention to provide a kind of method that combustion in situ exploits monoclinal structure oil reservoir, is produced using burning
Flue gas re-injection forms artificial gas cap, the flue gas zero produced with realizing burning, and reduces injection air capacity and running cost；
Using the non-producing reserves of artificial gas cap effective displacement burning periptery, to improve oil recovery.
The object of the present invention is achieved like this, a kind of method that combustion in situ exploits monoclinal structure oil reservoir, and the method is extremely
Comprise the following steps less：
(1) well pattern is disposed, the perforating modes of gas injection well and producing well is set；
In oil reservoir construction extreme higher position deployment at least a bite gas injection well of updip direction, dispose successively flatly along downdip direction
Or flatly more than producing well constituting flooding pattern；Producing well is referred to as a line producing well, two wires production successively along downdip direction
Well, three line producing wells, and so on；In plane at a distance of certain between gas injection well and producing well, between producing well and producing well
Distance；Enter down in the pit shaft that gas injection well, producing well distinguish perforation, gas injection well and producing well in the middle part of top of oil horizon and oil reservoir
Oil pipe in the middle part of oil reservoir, and in the middle part of the top of oil horizon and oil reservoir between oil jacket annular space in arrange packer to separate top of oil horizon
With two perforated intervals in the middle part of oil reservoir；Gas injection is distinguished from oil pipe, oil jacket annular space and is recovered the oil；
(2) initial stage is from gas injection well oil pipe to oil reservoir air injection, lights oil reservoir displacement crude oil；
(3) deep fat and flue gas of burning generation is via a line producing well, two wires producing well, three line producing wells and more lifes
Ground is returned on the oil pipe for producing well；
(4) flue gas refills oil via the top perforated interval after gas-liquid separator separates from gas injection well oil jacket annular space
Layer；
(5) when live wire is burned to downwards a line producing well perforated interval, original gas injection well is changed to flue gas reinjection well, a line
Producing well is changed to fireflood gas injection well, from the oil jacket annular space and oil pipe of original gas injection well while injection flue gas；
(6) from a line producing well oil pipe to continuous oil reservoir air injection, the deep fat for producing that burns is given birth to via two wires with flue gas
Return ground on the oil pipe for producing well, three line producing wells and more producing wells, then from original gas injection well oil jacket annular space and oil pipe and
Flue gas is refilled oil reservoir by the oil jacket annular space of one line producing well；And so on.
In a better embodiment of the present invention, the structure dip of monoclinal structure oil reservoir is more than or equal to 7 °.
In a better embodiment of the present invention, in step (1), between gas injection well and producing well, producing well and life
Produce between well in plane at a distance of 50-500 rice.
From the above mentioned, the method that combustion in situ of the present invention exploits monoclinal structure oil reservoir, constructs most in the oil reservoir of updip direction
High position deployment at least a bite gas injection well, disposes an at least line, two wires, three lines and more productions flatly successively along downdip direction
Well；Gas injection well distinguishes perforation, and the oil jacket annular space between top of oil horizon and middle part at top of oil horizon and middle part with producing well
In under enter thermal packer to separate two perforated intervals；Enter oil pipe in the middle part of oil reservoir under in gas injection well and production well shaft, from
Gas injection can be distinguished in oil jacket annular space and is recovered the oil.Initial stage, from gas injection well oil pipe to continuous oil reservoir air injection, lights oil reservoir and displacement is former
Oil, returns ground, flue gas Jing on the deep fat and oil pipe of the flue gas via one, two, three lines and more producing wells for producing that burn
Oil reservoir is refilled by the top perforated interval after gas-liquid separator separates from gas injection well oil jacket annular space；When live wire is burned to downwards one
During line producing well perforated interval, original gas injection well is changed to flue gas reinjection well, and a line producing well is changed to fireflood gas injection well, from original note
The oil jacket annular space of gas well and oil pipe are while injection flue gas；From a line producing well oil pipe to continuous oil reservoir air injection, burning is produced
Deep fat and oil pipe of the flue gas via two, three lines and more producing wells on return ground, then from original gas injection well oil jacket annular space
Flue gas is refilled into oil reservoir with the oil jacket annular space of oil pipe and a line producing well, and so on.Using high dip angle oil reservoir
Flue gas re-injection make up burned region space, reduce air injection rate, reduce cost of winning, improve combustion in situ development benefit.
The method of the present invention is applied to the thin oil of all kinds of suitable combustion in situ exploitation of the structure dip more than or equal to 7 ° and thick
Oil reservoir.The method of combustion in situ exploitation monoclinal structure oil reservoir of the present invention has the advantages that：
(1) in fireflood development process, a large amount of flue gases for producing of burning pass through ground together with residual air to the present invention
Gas-liquid separator is recycled into top oil reservoir, and non-discharge ground, therefore avoid substantial amounts of hydrogen sulfide, the titanium dioxide that burning is produced
The toxic gas environmental pollution such as sulfur, carbon monoxide, realizes zero-emission；
(2) by flue gas re-injection, the waste heat for making full use of the waste gas that burning is produced to carry, it is to avoid amount of heat loss
To in air；Burned region space is filled up using the portion gas, substantial amounts of air injection is saved, achievable low-cost high-efficiency is opened
Send out；
(3) the high dip angle monoclinal structure oil reservoir for oil reservoir structure dip more than or equal to 7 °, using the baked wheaten cake oil of the present invention
During layer exploitation, during from structural high part to lower location of the structure air injection, burning produces flue gas and constantly fills up burned region space, cigarette
Road gas will burned region formed an artificial gas cap, and with to construction downdip direction burning carrying out and constantly expand and to
Construction downdip direction is expanded, and is had a down dip in expanding course to construction in artificial gas cap, and a large amount of live wires stream the non-producing reserves in region
Effectively will be involved, and by the producing well of displacement to construction downdip direction；Therefore, the displacement effect of artificial gas cap will
Further expand swept volume on the basis of fireflood, and improve oil recovery factor.
Description of the drawings
The following drawings is only intended in schematic illustration and explanation is done to the present invention, is not delimit the scope of the invention.Wherein：
Fig. 1：For combustion in situ of the present invention exploit monoclinal structure oil reservoir one specific embodiment of method well site deployment with open
Adopt schematic diagram.
Reference numeral：
1- gas injection wells；Mono- line producing wells of 2-；3- two wires producing well；Tri- line producing wells of 4-；
5- packers；6- oil jacket annular spaces；7- burning live wire leading edges；8- pneumatic jacks；
9- oil reservoirs；11- oil pipes；12- sleeve pipes；
21- bottoms perforated interval；22- tops perforated interval；θ-structure dip；
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now control illustrates this
Bright specific embodiment.
The present invention proposes a kind of method that combustion in situ exploits monoclinal structure oil reservoir, in the updip direction of monoclinal structure oil reservoir
Oil reservoir construction extreme higher position deployment at least a bite gas injection well, along the producing well that downdip direction is disposed more than flatly or flatly successively
To constitute flooding pattern；Producing well along downdip direction successively be referred to as a line producing well, two wires producing well, three line producing wells, and with
This analogizes；Between gas injection well and producing well, between producing well and producing well in plane in a distance；Gas injection well, producing well
In the pit shaft for perforation, gas injection well and producing well being distinguished in the middle part of top of oil horizon and oil reservoir enter down oil pipe in the middle part of oil reservoir, and
Arrange packer to separate two in the middle part of top of oil horizon and oil reservoir in oil jacket annular space between in the middle part of the top of oil horizon and oil reservoir
Perforated interval；Gas injection is distinguished from oil pipe, oil jacket annular space and is recovered the oil；Initial stage, from gas injection well oil pipe to continuous oil reservoir air injection, lights
Oil reservoir displacement crude oil, return ground on the deep fat and oil pipe of the flue gas via one, two, three lines and more producing wells for producing that burn
Face, flue gas refill oil reservoir via the top perforated interval after gas-liquid separator separates from gas injection well oil jacket annular space；Work as live wire
When being burned to downwards a line producing well perforated interval, original gas injection well is changed to flue gas reinjection well, and a line producing well is changed to fireflood note
Gas well, from the oil jacket annular space and oil pipe of original gas injection well while injection flue gas；Note from a line producing well oil pipe to continuous oil reservoir
Air, returns ground on the deep fat and oil pipe of the flue gas via two, three lines and more producing wells for producing that burn, then from original note
Flue gas is refilled oil reservoir with the oil jacket annular space of oil pipe and a line producing well by gas well oil jacket annular space, and so on.Profit
Burned region space is made up with the flue gas re-injection of high dip angle oil reservoir, air injection rate is reduced, cost of winning is reduced, is improved and is burnt oil
Layer development benefit.
The method of the present invention is made an explanation with specific embodiment below.
Embodiment one
As shown in figure 1, the present embodiment provides a kind of method that combustion in situ exploits monoclinal structure oil reservoir, the construction of the oil reservoir
Inclination angle theta is 7 °, is carried out using following steps：
(1) well pattern is disposed, the perforating modes of gas injection well and producing well is set；
A bite gas injection well 1 is disposed in the oil reservoir construction extreme higher position of updip direction, three mouthfuls of lifes is disposed successively along downdip direction
Produce well, a respectively line producing well 2, two wires producing well 3 and three line producing wells 4；Between gas injection well and producing well, producing well and life
Produce between well in plane at a distance of 500 meters of (horizontal range)；Gas injection well is penetrated at the top and middle part of oil reservoir 9 respectively with producing well
Hole, forms top perforated interval 22 and bottom perforated interval 21；Enter down oil pipe 11 respectively in gas injection well and producing well wellbore casing 12 to arrive
In the middle part of oil reservoir, thermal packer 5 is set in the oil jacket annular space 6 between top of oil horizon and middle part, to separate two perforated intervals
21、22；Gas injection can be distinguished from oil pipe 11 with oil jacket annular space 6 and is recovered the oil.The concrete technology of the packer 5 adopts one's own profession in the industry
Disclosed technique is carried out.
(2) initial stage from the oil pipe 11 of gas injection well 1 to continuous oil reservoir air injection, light oil reservoir using chemic ignition mode and drive
For crude oil；Ignition process is carried out by the way of one's own profession is general in the industry, and continues air injection to maintain oil reservoir to burn, air injection
Speed is 20 ton days；
(3) oil of the deep fat and flue gas of burning generation via a line producing well 2, two wires producing well 3 and three line producing wells 4
Ground is returned on pipe 11；The individual well fluid highest speed of response is 30 ton days；
(4) after flue gas is separated via the gas-liquid separator (not shown) on ground, from 1 oil jacket annular space 6 of gas injection well
Top perforated interval 22 refills oil reservoir；
(5) when live wire leading edge 7 of burning is burned to downwards the perforated interval of a line producing well 2, original gas injection well 1 is changed to flue
Gas reinjection well, a line producing well 2 are changed to fireflood gas injection well, inject cigarette simultaneously from the oil jacket annular space 6 and oil pipe 11 of original gas injection well 1
Road gas；
(6) from the oil pipe 11 of a line producing well 2 to continuous oil reservoir air injection, the deep fat and the flue gas that produce of burning is via two
Return ground on the oil pipe 11 of line producing well 3 and three line producing wells 4, then from the oil jacket annular space 6 of original gas injection well 1 and oil pipe 11,
And one the oil jacket annular space 6 of line producing well 2 flue gas is refilled into oil reservoir, and so on.
The present embodiment adopts above-mentioned steps and operating parameter, the successful implementation combustion in situ exploitation of the high dip angle oil reservoir；
Effect is projected with two aspects：Accumulative injection air capacity reduces half than the exploitation of conventional combustion in situ, and operating cost is reduced
30%, economic benefit significantly improves；Re-injection formed artificial flue gas pneumatic jack 8 effectively involve, displacement and employed baked wheaten cake around
The crude oil of stream area (unburned area), recovery ratio improve 10% than the exploitation of conventional combustion in situ.
Embodiment two
As shown in figure 1, the present embodiment provides a kind of method that combustion in situ exploits monoclinal structure oil reservoir, the construction of the oil reservoir
Inclination angle theta is 10 °, is carried out using following steps：
(1) well pattern is disposed, the perforating modes of gas injection well and producing well is set；
A bite gas injection well 1 is disposed in the oil reservoir construction extreme higher position of updip direction, three mouthfuls of lifes is disposed successively along downdip direction
Produce well, a respectively line producing well 2, two wires producing well 3 and three line producing wells 4；Between gas injection well and producing well, producing well and life
Produce between well in plane at a distance of 50 meters of (horizontal range)；Gas injection well distinguishes perforation at the top of oil reservoir 9 and middle part with producing well,
Form top perforated interval 22 and bottom perforated interval 21；Enter down oil pipe 11 respectively to oil reservoir in gas injection well and producing well wellbore casing 12
Middle part, in the oil jacket annular space 6 between top of oil horizon and middle part arrange thermal packer 5, with separate two perforated intervals 21,
22；Gas injection can be distinguished from oil pipe 11 with oil jacket annular space 6 and is recovered the oil.The concrete technology of the packer 5 is public in the industry using one's own profession
The technique opened is carried out.
(2) initial stage from the oil pipe 11 of gas injection well 1 to continuous oil reservoir air injection, light oil reservoir using chemic ignition mode and drive
For crude oil；Ignition process is carried out by the way of one's own profession is general in the industry, and continues air injection to maintain oil reservoir to burn, air injection
Speed is 50 ton days；
(3) oil of the deep fat and flue gas of burning generation via a line producing well 2, two wires producing well 3 and three line producing wells 4
Ground is returned on pipe 11；The individual well fluid highest speed of response is 50 ton days；
(4) after flue gas is separated via the gas-liquid separator (not shown) on ground, from 1 oil jacket annular space 6 of gas injection well
Top perforated interval 22 refills oil reservoir；
(5) when live wire leading edge 7 of burning is burned to downwards the perforated interval of a line producing well 2, original gas injection well 1 is changed to flue
Gas reinjection well, a line producing well 2 are changed to fireflood gas injection well, inject cigarette simultaneously from the oil jacket annular space 6 and oil pipe 11 of original gas injection well 1
Road gas；
(6) from the oil pipe 11 of a line producing well 2 to continuous oil reservoir air injection, the deep fat and the flue gas that produce of burning is via two
Return ground on the oil pipe 11 of line producing well 3 and three line producing wells 4, then from the oil jacket annular space 6 of original gas injection well 1 and oil pipe 11,
And one the oil jacket annular space 6 of line producing well 2 flue gas is refilled into oil reservoir, and so on.
The present embodiment adopts above-mentioned steps and operating parameter, the successful implementation combustion in situ exploitation of the high dip angle oil reservoir；
Effect is projected with two aspects：Accumulative injection air capacity reduces 2/3 than the exploitation of conventional combustion in situ, and operating cost is reduced
40%, economic benefit is significantly improved；Re-injection formed artificial flue gas pneumatic jack 8 effectively involve, displacement and employed baked wheaten cake stream
The crude oil in area (unburned area), recovery ratio improve 15% than the exploitation of conventional combustion in situ.
Schematically specific embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any
Those skilled in the art, done equivalent variations and modification on the premise of the design without departing from the present invention and principle,
The scope of protection of the invention should be belonged to.
Claims (3)
1. a kind of method that combustion in situ exploits monoclinal structure oil reservoir, the method are at least comprised the following steps：
(1) well pattern is disposed, the perforating modes of gas injection well and producing well is set；
In oil reservoir construction extreme higher position deployment at least a bite gas injection well of updip direction, a bite or one are disposed successively along downdip direction
Producing well more than mouthful is constituting flooding pattern；Producing well along downdip direction successively be referred to as a line producing well, two wires producing well, three
Line producing well, and so on；Between gas injection well and producing well, between producing well and producing well in plane in a distance；
Enter oil pipe down in the pit shaft that gas injection well, producing well distinguish perforation, gas injection well and producing well in the middle part of top of oil horizon and oil reservoir
To in the middle part of oil reservoir, and in the middle part of the top of oil horizon and oil reservoir between oil jacket annular space in arrange packer to separate top of oil horizon and oil
Two perforated intervals in layer middle part；Gas injection is distinguished from oil pipe, oil jacket annular space and is recovered the oil；
(2) initial stage is from gas injection well oil pipe to oil reservoir air injection, lights oil reservoir displacement crude oil；
(3) deep fat and flue gas of burning generation is via a line producing well, two wires producing well, three line producing wells and more producing wells
Oil pipe on return ground；
(4) flue gas refills oil reservoir via the top perforated interval after gas-liquid separator separates from gas injection well oil jacket annular space；
(5) when live wire is burned to downwards a line producing well perforated interval, original gas injection well is changed to flue gas reinjection well, line production
Well is changed to fireflood gas injection well, from the oil jacket annular space and oil pipe of original gas injection well while injection flue gas；
(6) from a line producing well oil pipe to continuous oil reservoir air injection, the deep fat and the flue gas that produce of burning via two wires producing well,
Ground is returned on the oil pipe of three line producing wells and more producing wells, then from original gas injection well oil jacket annular space and oil pipe and a line
Flue gas is refilled oil reservoir by the oil jacket annular space of producing well；And so on.
2. the method that combustion in situ as claimed in claim 1 exploits monoclinal structure oil reservoir, it is characterised in that：Monoclinal structure oil reservoir
Structure dip be more than or equal to 7 °.
3. the method that combustion in situ as claimed in claim 1 exploits monoclinal structure oil reservoir, it is characterised in that：In step (1),
In plane at a distance of 50-500 rice between gas injection well and producing well, between producing well and producing well.
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| CN105545274B (en) * | 2015-12-09 | 2018-07-13 | 中国石油天然气股份有限公司 | A kind of well pattern and method improving thick-layer heavy crude reservoir fireflood effect |
| CN107435535B (en) * | 2016-05-26 | 2019-10-11 | 中国石油大学(北京) | A method of exploitation high dip angle heavy crude reservoir is driven using plane gravity |
| CN106761638B (en) * | 2016-12-15 | 2019-05-07 | 中国石油天然气股份有限公司 | The fireflood of high dip angle heavy crude reservoir cooperates with recovery method with the drive of flue gas re-injection gravity |
| CN113445984B (en) * | 2020-03-25 | 2022-06-03 | 中国石油天然气股份有限公司 | Fire flooding mining method for side water invasion heavy oil reservoir with stratum inclination angle |
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| US4436344A (en) * | 1981-05-20 | 1984-03-13 | Standard Oil Company (Indiana) | In situ retorting of oil shale with pulsed combustion |
| CN101122227A (en) * | 2007-09-30 | 2008-02-13 | 辽河石油勘探局 | Fire flooding oil extraction crude oil combustion-assistant ignition process |
| US20140041867A1 (en) * | 2012-08-07 | 2014-02-13 | John Belgrave | Enhanced oil recovery initiated with zero emission in-situ combustion |
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Inventor after: Guan Wenlong Inventor after: Zheng Haoran Inventor after: Jiang Youwei Inventor after: Wu Yongbin Inventor after: Xi Changfeng Inventor after: Zhang Xialin Inventor after: Wang Hongzhuang Inventor after: Tang Junshi Inventor after: Wang Bojun Inventor after: Li Qiu Inventor before: Wu Yongbin Inventor before: Wang Hongzhuang Inventor before: Jiang Youwei |
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