CN107100604B - A method of it is lighted a fire using nano combustion improver and carries out combustion in situ exploitation - Google Patents
A method of it is lighted a fire using nano combustion improver and carries out combustion in situ exploitation Download PDFInfo
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- CN107100604B CN107100604B CN201710157069.9A CN201710157069A CN107100604B CN 107100604 B CN107100604 B CN 107100604B CN 201710157069 A CN201710157069 A CN 201710157069A CN 107100604 B CN107100604 B CN 107100604B
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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
Abstract
The present invention provides a kind of method for carrying out combustion in situ exploitation using nano combustion improver igniting.Method includes the following steps: choosing heavy oil reservoirs；Steam slug is injected into the oil reservoir of heavy oil reservoirs well pattern gas injection well, 100 DEG C of temperature > where keeping oil reservoir at stratum, pressure > 2MPa；Then nano combustion improver solution is injected into heavy oil reservoirs well pattern gas injection well oil reservoir and is stood；It is continuously injected into normal temperature air into the oil reservoir of heavy oil reservoirs pattern injector, to realize spontaneous ignition；Producing well is opened, combustion in situ exploitation is conventionally carried out.The method provided by the invention for carrying out combustion in situ exploitation using nano combustion improver igniting, the oil layer ignition that can be suitable under conditions of pressure < 5MPa or 250 DEG C of temperature < of stratum, greatly improve the thermal efficiency of fireflood test, reach the viscosity for reducing crude oil, the mobility of crude oil is improved, it is with good economic efficiency.
Description
Technical field
The invention belongs to heavy oil fields oil recovery technique fields, are related to a kind of light a fire using nano combustion improver and carry out combustion in situ
The method of exploitation.
Background technique
There are mainly two types of include that electric ignition and chemic ignition method, chemic ignition are main for current combustion in situ ignition process
It is that injection steam and chemical catalyst, conventional electric ignition temperature are needed persistently to keep 550 DEG C or more, just be can guarantee in hot-air
The oxidation of oxygen and in-place oil, lights oil reservoir；Being unevenly distributed property of conventional chemical point cause of fire chemical catalyst, catalysis connect
Contacting surface product, catalytic efficiency etc. influence, and generally may be only available for pressure > 5MPa, and the oil reservoir on stratum of the temperature greater than 250 DEG C,
Therefore shallow-layer oil reservoir (oil reservoir on the stratum of < 300m) due to pressure is lower or ultra deep oil reservoir (stratum of > 1000m
Oil reservoir) since injection steam heat loss is big, temperature is lower, can not successful implementation chemic ignition.
Summary of the invention
Based on above-mentioned technical problem, in order to enhance crude oil oxidation during chemic ignition, shorten the duration of ignition, expand
The condition of compatibility of big chemic ignition is opened the purpose of the present invention is to provide a kind of using nano combustion improver igniting progress combustion in situ
The method adopted, this method can be suitable for the oil layer ignition under conditions of pressure < 5MPa or 250 DEG C of temperature < of stratum.
The purpose of the present invention is achieved by the following technical programs:
The present invention provides a kind of method for carrying out combustion in situ exploitation using nano combustion improver igniting comprising following step
It is rapid:
Step 1 chooses heavy oil reservoirs；
Step 2 injects steam slug into the oil reservoir of heavy oil reservoirs well pattern gas injection well, where keeping oil reservoir at stratum
100 DEG C of temperature >, pressure > 2MPa；Then nano combustion improver solution and quiet is injected into the oil reservoir of heavy oil reservoirs well pattern gas injection well
It sets；
Step 3 is continuously injected into normal temperature air into the oil reservoir of heavy oil reservoirs pattern injector, to realize spontaneous ignition；
Step 4 opens producing well, conventionally carries out combustion in situ exploitation；
Wherein, the nano combustion improver solution is that the zinc sulphide containing 10% mass concentration and 0.1%-0.5% mass are dense
The diesel oil of the nano-dispersing agent of degree.
In the above-mentioned method for carrying out combustion in situ exploitation of lighting a fire using nano combustion improver, heavy oil reservoirs are chosen according to conventional side
Method carries out, it is preferable that chooses the condition of heavy oil reservoirs are as follows: core intersection > 8m, reservoir permeability > 200 × 10-3μm2, crude oil
Viscosity < 10000mPas, oil saturation > 50%, oil reservoir are located at shallow layer stratum or ultra deep stratum.
In the above-mentioned method for carrying out combustion in situ exploitation of being lighted a fire using nano combustion improver, it is preferable that in step 2, Xiang Chong
The injection rate that steam slug is injected in the oil reservoir of oil reservoir well pattern gas injection well is 100-120 tons/rice.
In the above-mentioned method for carrying out combustion in situ exploitation of being lighted a fire using nano combustion improver, it is preferable that the nano-dispersing agent
Including lauryl sodium sulfate (SDS) and/or neopelex (SDBS).The nano-dispersing agent can make zinc sulphide
It is dispersed in diesel oil, has good stability.
In the above-mentioned method for carrying out combustion in situ exploitation of being lighted a fire using nano combustion improver, it is preferable that described in step 2
The injection rate of nano combustion improver solution is the 0.2%-0.5% of oil content in control area.Oil content refers in the control area
Oil content in heavy oil reservoirs well-pattern spacing of the present invention.
In the above-mentioned method for carrying out combustion in situ exploitation of being lighted a fire using nano combustion improver, it is preferable that in step 2, injection
The time stood after nano combustion improver solution is 1-5d.
In the above-mentioned method for carrying out combustion in situ exploitation of being lighted a fire using nano combustion improver, it is preferable that in step 3, Xiang Jing
The injection rate that normal temperature air is continuously injected into the oil reservoir of net injection well is 500-600Sm3/ rice.
In the above-mentioned method for carrying out combustion in situ exploitation of being lighted a fire using nano combustion improver, it is preferable that in step 3, Xiang Jing
The injection length that normal temperature air is continuously injected into the oil reservoir of net injection well is 5-6d.
" shallow-layer oil reservoir " of the present invention refers to the oil reservoir on stratum of the oil reservoir buried depth less than 300m；" ultra deep stratum "
Refer to the oil reservoir on stratum of the oil reservoir buried depth greater than 2000m.
Combustion in situ in the present invention, which is directed to inject air in oil reservoir, to reach a high temperature burning, cracking a portion heavy
Component provides the heavy crude heat extraction technology that heat recovers the oil as fuel into oil reservoir.
The present invention is lighted a fire using nano combustion improver in the method for carrying out combustion in situ exploitation, after nano combustion improver is added, by
It can be preferably dissolved in oil and water in nano combustion improver, molecular particle size is small, can uniformly be scattered in ignition position at the top of perforation
In steam near setting, good, the active height of selectivity has biggish specific surface and more active reaction centers, to improve
Interfacial activity expands molecule contacts area, improves the oxidation rate of in-place oil and degree, promotion crude oil are quickly lighted, received completely
The selectivity of rice combustion adjuvant is good, active height, has biggish specific surface and more active reaction centers, effectively reduces igniting
Condition implement ignition operation can smoothly in 250 DEG C or less or pressure on the stratum below 5MPa in temperature.This
Kind method is greatly improved the thermal efficiency of fireflood test, reaches the viscosity for reducing crude oil, improves the purpose of the mobility of crude oil.Phase
It is with good economic efficiency compared with conventional electric igniter firing technique.
Provided by the invention lighted a fire using nano combustion improver carries out combustion in situ recovery method:
(1) improve the thermal efficiency: nano combustion improver can be improved the oxidation rate of in-place oil and spend completely, promote crude oil
Quickly to light, the selectivity of nano combustion improver is good, active height, there is biggish specific surface and more active reaction centers, because
This combustion-supporting performance is more preferable.
(2) it reduces ignition condition: more complicated reservoir condition (pressure < 2MPa or temperature < 100 DEG C) success can be made
It realizes igniting, improves the condition of compatibility of chemic ignition technology.
(3) reduce air-oil ratio: since efficiency of combustion improves, then the fuel for being intended to oxidation is reduced, while institute
The specific air consumption needed is reduced, and fireflood air-oil ratio (AOR) reduces, and economic benefit is more preferable.
(4) safety for improving fireflood exploitation, reduces the electric leakage as caused by the unstability of electric igniter, the borehole wall
The risks such as irreducible oil detonation；
(5) economic benefit is improved: increased artificial since electric igniter requires resistance to 550 DEG C of process matched therewith or more high temperature
The consumables cost on operating cost and ground, underground equipment is larger, and present invention process technology is simpler, therefore the invention possesses well
Economic benefit.
The method provided by the invention for carrying out combustion in situ exploitation using nano combustion improver igniting, can be suitable for pressure <
Oil layer ignition under conditions of 5MPa or 250 DEG C of temperature < of stratum greatly improves the thermal efficiency of fireflood test, and it is former to reach reduction
The viscosity of oil, improves the mobility of crude oil；Compared with conventional ignition technology, being lighted a fire using nano combustion improver enhances combustion in situ mistake
Crude oil oxidation in journey shortens the duration of ignition, expands the condition of compatibility of chemic ignition, be greatly improved the point of fireflood oil reservoir
Igneous power, and more safety and environmental protection, it is with good economic efficiency.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Embodiment 1
The present embodiment provides a kind of methods for carrying out combustion in situ exploitation using nano combustion improver igniting comprising following step
It is rapid:
Step 1 selects Xinjiang Oilfield oil reservoir block, chooses heavy oil reservoirs according to conventional fireflood standard, infuses for a shallow-layer
Discarded oil reservoir after steam soak, has selected a well pattern in the oil reservoir, which is inverted five spot fireflood well group, receives to it
Rice combustion adjuvant chemic ignition engineering test.The oil reservoir buried depth is 200m (for shallow-layer oil reservoir), and mean reservoir pressure is
1.8MPa, formation temperature are 40 DEG C, effective pay thickiness 10m, porosity 29%, reservoir permeability 600mD, oil reservoir temperature
The lower averagely viscosity of crude of degree is 8000mPas, oil saturation 55%；
Step 2, measures the oil content in above-mentioned oil reservoir well-pattern spacing, and the oil content being calculated is 4 × 104m3,
800t steam slug is injected into the oil reservoir of heavy oil reservoirs well pattern gas injection well, 100 DEG C of temperature > where controlling oil reservoir at stratum,
Pressure > 2MPa；Then the nano combustion improver solution of 80t is injected into well pattern gas injection well oil reservoir, the nano combustion improver solution is
The diesel oil of the lauryl sodium sulfate of zinc sulphide containing 10% mass concentration and 0.1% mass concentration, is uniformly distributed in it
In oil reservoir, and stand 1d；
Step 3 is continuously injected into normal temperature air, injection rate 600Sm into the oil reservoir of heavy oil reservoirs pattern injector3/
D, is continuously injected into 5-6d, waits nano combustion improver solution sufficiently to react with oxygen, the crude oil in air in underground, to realize height
Warm spot fuel oil layer；
Step 4 opens producing well, conventionally carries out combustion in situ, air is continuously injected into oil reservoir, carries out
Production exploitation.
Using the method for carrying out combustion in situ exploitation using nano combustion improver igniting of the present embodiment, nano combustion improver cost
About 10,000 yuan/ton of unit price amounts to 800,000 yuan of input cost, and fireflood recovery percent of reserves is higher, is 70%-80%, remarkable in economical benefits.
It is significantly less than the economic benefit of practical increasing oil, is suitable for promoting.
Indoor physical model test display, in low-temp low-pressure, conventional ignition mode can not achieve efficient burning,
10% or more oxygen content is produced, and this value can be dropped to 2% or less using nano combustion improver firing technique of the present invention.
The method provided by the invention for carrying out combustion in situ exploitation using nano combustion improver igniting in summary, can be applicable in
Oil layer ignition under conditions of pressure < 5MPa or 250 DEG C of temperature < of stratum greatly improves the thermal efficiency of fireflood test, reaches
To the viscosity for reducing crude oil, the mobility of crude oil is improved；Compared with conventional ignition technology, being lighted a fire using nano combustion improver enhances fire
Crude oil oxidation during oil firing layer shortens the duration of ignition, expands the condition of compatibility of chemic ignition, be greatly improved fireflood
The ignition success rate of oil reservoir, and more safety and environmental protection, it is with good economic efficiency.
Claims (6)
1. a kind of method for carrying out combustion in situ exploitation using nano combustion improver igniting comprising following steps:
Step 1 chooses heavy oil reservoirs；
Step 2 injects steam slug into the oil reservoir of heavy oil reservoirs well pattern gas injection well, the temperature where keeping oil reservoir at stratum
100 DEG C of >, pressure > 2MPa；Then nano combustion improver solution is injected into the oil reservoir of heavy oil reservoirs well pattern gas injection well and is stood；
Step 3 is continuously injected into normal temperature air into the oil reservoir of heavy oil reservoirs pattern injector, to realize spontaneous ignition；
Step 4 opens producing well, conventionally carries out combustion in situ exploitation；
Wherein, the nano combustion improver solution is the zinc sulphide containing 10% mass concentration and 0.1%-0.5% mass concentration
The diesel oil of nano-dispersing agent；
The nano-dispersing agent includes lauryl sodium sulfate and/or neopelex；
In step 2, the injection rate of the nano combustion improver solution is the 0.2%-0.5% of oil content in control area.
2. the method according to claim 1 for carrying out combustion in situ exploitation using nano combustion improver igniting, which is characterized in that
Choose the condition of heavy oil reservoirs are as follows: core intersection > 8m, reservoir permeability > 200 × 10-3μm2, viscosity of crude <
10000mPas, oil saturation > 50%, oil reservoir are located at shallow-layer oil reservoir or ultra deep oil reservoir.
3. the method according to claim 1 for carrying out combustion in situ exploitation using nano combustion improver igniting, it is characterised in that:
In step 2, the injection rate that steam slug is injected into the oil reservoir of heavy oil reservoirs well pattern gas injection well is 100-120 tons/rice.
4. the method according to claim 1 for carrying out combustion in situ exploitation using nano combustion improver igniting, it is characterised in that:
In step 2, injecting the time stood after nano combustion improver solution is 1-5d.
5. the method according to claim 1 for carrying out combustion in situ exploitation using nano combustion improver igniting, it is characterised in that:
In step 3, the injection rate that normal temperature air is continuously injected into the oil reservoir of pattern injector is 500-600Sm3/ rice.
6. the method for carrying out combustion in situ exploitation using nano combustion improver igniting according to claim 1 or 5, feature exist
In: in step 3, the injection length that normal temperature air is continuously injected into the oil reservoir of pattern injector is 5-6d.
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| CN108844994B (en) * | 2018-04-02 | 2020-11-03 | 中国石油天然气股份有限公司 | Method and device for analyzing ignition influence of fractions with different temperatures on thickened oil |
| CN109505573B (en) * | 2019-01-08 | 2021-09-28 | 中国石油天然气股份有限公司 | Fire flooding oil reservoir combustion-supporting profile control method |
| CN109505575B (en) * | 2019-01-08 | 2021-05-28 | 中国石油天然气股份有限公司 | Combustible plugging method for water flooding fire flooding oil reservoir |
| CN109505574B (en) * | 2019-01-08 | 2021-08-03 | 中国石油天然气股份有限公司 | Combustible plugging process for flooding and fireflooding oil reservoir by heavy oil emulsification method |
| CN109652040B (en) * | 2019-01-08 | 2021-01-29 | 中国石油天然气股份有限公司 | Water flooding fire flooding oil reservoir oil-based combustible plugging agent |
| CN109505572B (en) * | 2019-01-08 | 2021-07-30 | 中国石油天然气股份有限公司 | Combustible plugging process for flooding and fireflooding oil reservoir by emulsified paraffin method |
| CN109826604B (en) * | 2019-01-08 | 2021-09-28 | 中国石油天然气股份有限公司 | Combustion-supporting channeling sealing method for fireflooding reservoir |
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| 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 |
| CN102071918A (en) * | 2010-12-22 | 2011-05-25 | 中国石油天然气集团公司 | Thick oil reservoir fire flooding oil extraction combustion-supporting ignition method |
| FR2985266B1 (en) * | 2011-12-28 | 2014-06-13 | Total Raffinage Marketing | COMBUSTIBLE COMPOSITION COMPRISING A HEAVY FUEL AND A PRODUCT FROM THE BIOMASS. |
| CN103244092B (en) * | 2013-04-12 | 2016-08-17 | 中国石油天然气股份有限公司 | A kind of method strengthening in-situ combustion heavy oil recovery oil reservoir |
| CN106194139B (en) * | 2016-07-08 | 2018-10-16 | 中国石油天然气股份有限公司 | The ignition method of combustion in situ |
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