CN103939072B - Liquid oxygen strong stimulation igniting air drives Pintsch process mixed phase gas recombination technology of reservoir sweep - Google Patents
Liquid oxygen strong stimulation igniting air drives Pintsch process mixed phase gas recombination technology of reservoir sweep Download PDFInfo
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- CN103939072B CN103939072B CN201410189218.6A CN201410189218A CN103939072B CN 103939072 B CN103939072 B CN 103939072B CN 201410189218 A CN201410189218 A CN 201410189218A CN 103939072 B CN103939072 B CN 103939072B
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Abstract
The present invention provides a kind of liquid oxygen strong stimulation igniting air drive Pintsch process mixed phase gas recombination technology of reservoir sweep,It is recovered the oil using straight well,The method that horizontal well production or the cooperation of straight well horizontal well are recovered the oil,Perforation is distinguished to straight well gas injection well oil reservoir atop part and bottom,By gas injection well appropriate liquid oxygen is injected to oil reservoir mesohigh direct-injection,Make oil reservoir Pintsch process spontaneous combustion,Air is injected after spontaneous ignition,Oxygen in air reacts in oil reservoir,Make oil stability,Oxygenation and redox reaction occur in cracking reaction,Release a large amount of heat and carbon dioxide,Oil reservoir is set to form Pintsch process band,Reversed gas injection again,After oil reservoir formation Pintsch process near gas injection well,Large quantity of air is injected into oil reservoir by oil recovery producing well,Steam,The carbon dioxide that oxygen is generated with formation reaction is partially soluble in crude oil,Crude oil is diluted,The gas that Pintsch process generates forms pneumatic jack in top of oil horizon,Pressure is applied to oil reservoir,It plays a role in promoting to crude oil flow.
Description
Technical field
The present invention relates to a kind of complex oil displacing technology, especially a kind of complex oil displacing technology of mixed phase gas.
Background technology
Along with China's rapid development of economy, the demand to the crude oil energy is growing day by day.Chinese current verified oil
Reserves are up to 20,000,000,000 tons, but the oil in China largely relies on import, this is because the oil production method in China oil field mainly passes
The mechanical oil recovery method of system, average recovery ratio 25%, nearly 3/4ths crude oil stay in underground.Especially low-permeability oilfield, (super)
The recovery ratio in the oil field after viscous crude field, high-content wax oil field and water filling steam flooding, the chemical displacement of reservoir oil is less than 10%, even more
Low, substantial oil can not produce, and on the one hand cause the idle of huge energy waste and matched facilities, on the other hand big
Amount is by relying on import, considerably increasing the energy cost of China's economic development.
Traditional mechanical oil recovery method, with machinery and using stratum primary energy recover the oil based on, add water filling, note chemical drugs
The methods of agent, steam injection, note biology, energy consumption is big, of high cost, and water pollution and environmental pollution are very serious, but tar productivity is very
Low, after primary, secondary oil recovery, a large amount of crude oil remains in underground and can not produce in oil field, even across many kinds of measures, such as water
Oil recovery, steam-assisted recovery, chemical recovery etc. are driven, the raising of recovery ratio is still extremely limited.Low-permeability oilfield permeability is very low, flows
Property it is poor, the viscosity in viscous crude super-viscous oil oil field is high, than great, poor fluidity, and such oil reservoir can not produce substantially, high waxy oil
It hides, the high water-cut reservoir that water filling steam drove, similarly there is a problem of that coefficient of mining is low.These problems are also current puzzlement China
Or even world oil exploits field great difficult problem.According to incompletely statistics, similar halt production, half halt production, stripper well have more than 15 ten thousand mouthfuls,
The technology that some oil wells can such as use us to invent carries out scientific and reasonable orderly exploitation, and the oil field can be made to extend for more than 30 years
It recovers the oil the time, obtains a large amount of valuable crude oil.
It can not be exploited for current low-permeability oilfield, viscous crude super-viscous oil, high-content wax oil field, high water cut oil field or recovery ratio is low
Present situation, the present invention provide a kind of mixed phase gas recombination technology of reservoir sweep, have energy conservation and environmental protection, small investment, increase substantially recovery ratio
The advantages of.Invention content
To solve the above-mentioned problems, the present invention provides a kind of mixed phase gas recombination technology of reservoir sweep, and it is super to can be applied to viscous crude
Heavy crude reservoir, hypotonic thin oil Tibetan, high-content wax oil reservoir, water filling steam drove the oil reservoir of has channeling after high water-cut reservoir and pressure break, carried
High tar productivity reduces pollution and destruction to environment, can also extend the service life of oil well.It is low for the abnormal geological, low temperature
Pressure, multilayer oil sheet, stratum energy are very poor, the oil reservoir of oil recovery present situation can not be solved using water filling and steam injection, strong using liquid oxygen
Air of lighting a fire is stimulated to drive Pintsch process mixed phase gas recombination technology of reservoir sweep, the drive of progress air is mating in conjunction with steam drive joint, in life
Production well progress vapour fire, which is handled up, draws effect, improves recovery ratio.
Liquid oxygen strong stimulation igniting air provided by the invention drives Pintsch process mixed phase gas recombination technology of reservoir sweep, including following
Step：
In the present invention, the promotion pressure generated by oil reservoir Pintsch process makes flowable crude oil and water form oily wall.With
Gas injection continues, and Pintsch process band constantly expands movement outward, and oily wall pushes crude oil to be flowed to producing well direction, and crude oil absorbs greatly
Calorimetric amount and carbon dioxide, reservoir temperature increase, volume expansion, and viscosity reduces, mobility enhancing and seepage velocity are accelerated.By
Under the multiple action that Pintsch process pressure difference, gas expansion active force, oil reservoir expansion power and oily wall push, crude oil is to pressure
It flows and is produced by oil recovery producing well in power lower oil recovery producing well direction.Realize that fluid injection oxygen stimulation igniting air drives Pintsch process
Reversed gas injection fire flood technology achievees the purpose that mix to complex oil displacing oil field, volume increase, increases oil.
Gas injection well and the mode of oil recovery producing well gas injection are one of the innovations of the present invention, can by the reversed gas injection of producing well
Make oil reservoir reach a high temperature within the shortest time crack spontaneous combustion, supplement strata pressure, promote reservoir temperature and dilation, enhancing oil
Laminar flow, the purpose for improving rate of oil production and oil production.
Description of the drawings
Fig. 1 is the producing well well spacing schematic diagram of the embodiment of the present invention
Fig. 2 is the gas injection schematic diagram of the embodiment of the present invention
Fig. 3 is the Pressure/Temperature change schematic diagram of the embodiment of the present invention
In figure：1, gas injection well, 2, oil recovery straight well, 3, oil reservoir, 4, gas leap up channel, 5, gas pressure direction, 6, recover the oil it is horizontal
Well, 7, gas motion direction, 8, stratum, 9, crude oil flow direction, 10, gas injection zone, 11, pressure relief area, 12, high
Warm cracking region, 13, reagentia region, 14, pressure profile, 15, temperature profile, 16, the oil reservoir direction of motion.
(explanation that above-mentioned reference numeral is please supplemented in the description of specific implementation mode)
Specific implementation mode
The present invention is further elaborated below in conjunction with the accompanying drawings.
According to stratum and reservoir exploration data, selected area update strategy rate range is in 200 millidarcies, porosity 15, formation temperature 40
DEG C or more oil reservoir select more mouthfuls of straight wells as gas injection well 1 according to oil reservoir and surface state, optimize and well group change
It makes, can also add according to actual needs and bore gas injection well 1；Select existing oil reservoir sedimentary facies and the preferable straight well 2 of underground mobility and water
Horizontal well is as oil recovery producing well, and permeability, degree of involving, oil reservoir air-breathing energy are preferable, the well-arranging procedure of producing well and gas injection well 1
Will be well thrashed out calculating according to oil reservoir data, gas injection speed, Pintsch process speed, existing well spacing etc., in design technology
Producing well is arranged concretely when route, in the present embodiment, using inverted five spot well-arranging procedure, straight well oil recovery, horizontal well production
Coordinate the method recovered the oil.As shown in Figure 1, installing temperature-control pressure-control monitoring, anti-coking, burn-out-proof well protection dress in horizontal well production well 6
It sets.Gas injection pressure ranging from 30 megapascal, individual well gas injection rate ranging from 120,000 sides/day；According to oil reservoir situation and thickness, straight well is noted
20% length of perforation is distinguished in 3 atop part of gas well oil reservoir and bottom；Oil recovery producing well is distributed according to oil reservoir connection situation and gas
Trend carries out communication direction oil reservoir part whole perforation, horizontal well gas-injection well and producing well between the segmentation of oil reservoir position horizontal segment
Every perforation, it is therefore an objective to the liquid oxygen and air of injection can be injected directly into oil reservoir, in oil reservoir fast pyrolysis, heat increasing
Pressure carries out the mixed phase gas recombination displacement of reservoir oil, and oil recovery production bottom installs electric heater unit, and Anti-solidification work is played to recovering the oil to be promoted
With can smoothly recover the oil；
There is gas to leap up channel 4 in the present embodiment in oil reservoir, by injecting chemical plugging agent to oil reservoir mesohigh, in oil reservoir
Gas channel 4 of leaping up is blocked, and prevent from occurring when gas injection the gas phenomenon that leaps up if there is small-sized fracture belt in oil reservoir, can also adopt certainly
It is blocked with the method for injecting chemical plugging agent to oil reservoir mesohigh.
As shown in Fig. 2, injecting appropriate liquid oxygen to oil reservoir mesohigh direct-injection by gas injection well 1, make 3 Pintsch process of oil reservoir certainly
Combustion, liquid oxygen are directly injected to by high-pressure gas injection device after 3 bottom of oil reservoir enters oil reservoir 3, generate strong heat chemistry in oil reservoir 3 rapidly
Pintsch process is reacted, a large amount of mixed phase gases are generated, makes crude oil that cracking hypergolic reaction occur, completes spontaneous ignition；Complete self-ignition point
After fire, air is injected by gas injection well 1 immediately, air enters oil reservoir 3 along gas motion direction 7 by gas injection well, in air
Oxygen react rapidly in oil reservoir 3, make oil stability, first occur Oxygenation in cracking reaction, release heat
Amount, then occurs redox reaction, releases a large amount of heat and carbon dioxide, so that oil reservoir 3 is formed with gas injection well 1 be core to
Surrounding effectively controls the Pintsch process band 12 of Pintsch process, according to oil reservoir different geological conditions and oil reservoir gettering ability, adjusts day
Gas injection rate persistently injects air, so that 3 permanently effective continuous high temperature of oil reservoir is cracked, reaction equation：Hydrocarbon+O2 → oxygen-containing
Organic compound+energy, hydrocarbon+O2 → CO2/CO+H2O+ energy；Oil reservoir forms continual and steady near gas injection well
After Pintsch process, then by oil recovery producing well into oil reservoir inverse injection large quantity of air, steam, when oil recovery producing well individual well air
When injection rate is 800,000 side, stops injection air, inject 800 cubic metres of hot steams, further increase 8 pressure of stratum, oxygen with
The carbon dioxide that formation reaction generates is partially soluble in crude oil, is diluted to crude oil, simultaneously as Pintsch process generation is big
Gas is measured, such as carbon monoxide, carbon dioxide, nitrogen, vapor form pneumatic jack in top of oil horizon, apply huge pressure to oil reservoir
Power makes crude oil be flowed to oil recovery producing well according to crude oil flow direction 9.
It realizes that air drives the anti-Volleyball Association of producing well and closes highly effective matched oil recovery technique engineering, is to innovate very much effective oil recovery technique
Method.
As shown in figure 3, in gas injection zone 10, the oxygen in air forms high anneal crack with formation reaction Pintsch process
Region 12 is solved, forms reagentia region 13 in front, the promotion pressure of generation makes to flow as shown in pressure profile 14
Dynamic crude oil and water forms oily wall.As gas injection continues, Pintsch process band constantly expands movement outward, and oily wall pushes crude oil to life
The flowing of well direction is produced, crude oil absorbs amount of heat and carbon dioxide, and reservoir temperature increases, as shown in temperature profile 15,
Volume expansion, viscosity reduces, mobility enhancing and seepage velocity are accelerated.Since Pintsch process pressure difference, gas expansion act on
Under the multiple action that power, oil reservoir expansion power and oily wall push, 11 crude oil of pressure relief area is given birth to the lower oil recovery of pressure
Production well direction is flowed and is produced by oil recovery producing well, as shown in the oil reservoir direction of motion 16.Realize that fluid injection oxygen stimulation igniting air drives
The reversed gas injection fire flood technology of Pintsch process achievees the purpose that mix to complex oil displacing oil field, volume increase, increases oil.
Gas injection well and the mode of oil recovery producing well gas injection are one of the innovations of the present invention, can by the reversed gas injection of producing well
Make oil reservoir reach a high temperature within the shortest time crack spontaneous combustion, supplement strata pressure, promote reservoir temperature and dilation, enhancing oil
Laminar flow, the purpose for improving rate of oil production and oil production, for the abnormal geological, low-temp low-pressure, multilayer oil sheet, stratum energy
Oil reservoir very poor, that oil recovery present situation can not be solved using water filling and steam injection drives Pintsch process using liquid oxygen strong stimulation igniting air
Mixed phase gas recombination technology of reservoir sweep, progress air, which drives, combines steam drive joint mating, handles up in producing well progress vapour fire and draws effect, carries
High recovery rate.
Using the present invention, 50% or more oil recovery rate can be improved, greatly improve rate of oil production, it is applied widely, it can be big
Width extends the service life of oil well, and halt production, half dead well can be made to resume production, and changes the high energy consumption of secondary oil recovery
Present situation, energy-saving and emission-reduction, science innovation make full use of Chinese energy resources and sustainable development could be made that tremendous contribution.
Finally it should be noted that：The above embodiment is merely an example for clearly illustrating the present invention, and is not pair
The restriction of embodiment.For those of ordinary skill in the art, it can also be made on the basis of the above description
Its various forms of variation or variation.There is no need and unable to be enumerated to all embodiments.And it thus extends out
Obvious changes or variations be still in the protection scope of this invention.
1. selected area update strategy rate range is adopted in 0.2-3000 millidarcies, porosity ＞ 5, the oil reservoir of 10 DEG C of formation temperature or more
With inverted five spot, it is anti-9 points or row formula well spacing method carry out well spacing；
2. according to oil reservoir and surface state, select more mouthfuls of straight wells or horizontal well as gas injection well, optimizes and well
Group transformation can also add and bore gas injection well according to actual needs；It selects existing straight well and/or horizontal well as oil recovery producing well, carries out
Optimization design and well group transformation, or according to design plus drilling oil producing well；
3. being recovered the oil using straight well, horizontal well production or straight well horizontal well coordinate the method recovered the oil, gas injection pressure ranging from 2-
45 megapascal, individual well gas injection rate ranging from ten thousand sides of 0.1-20/day；
4. according to oil reservoir situation and thickness, 20% length of perforation is distinguished to straight well gas injection well oil reservoir atop part and bottom；
Oil recovery producing well carries out communication direction oil reservoir part whole perforation, horizontal well according to oil reservoir connection situation and gas distribution trend
In oil reservoir position horizontal segment section gap perforation, production bottom of recovering the oil installs electric heater unit for gas injection well and producing well；
5. injecting appropriate liquid oxygen to oil reservoir mesohigh direct-injection by gas injection well, make oil reservoir Pintsch process spontaneous combustion, liquid oxygen is by height
Pressure injection device of air is directly injected to after oil reservoir bottom enters oil reservoir, generates strong thermal chemical reaction Pintsch process in oil reservoir rapidly,
A large amount of mixed phase gases are generated, makes crude oil that cracking hypergolic reaction occur, completes spontaneous ignition；
6. after completing spontaneous ignition, injecting air by gas injection well immediately, the oxygen in air occurs rapidly in oil reservoir
Reaction, makes oil stability, and Oxygenation first occurs in cracking reaction, discharges heat, then redox reaction occurs, releases
A large amount of heat and carbon dioxide are released, oil reservoir is made to form the high temperature for effectively controlling Pintsch process around using gas injection well as core
Band is cracked, according to oil reservoir different geological conditions and oil reservoir gettering ability, adjustment day gas injection rate persistently injects air, keeps oil reservoir long-term
Effective continuous high temperature cracking；Reaction equation：Hydrocarbon+O2 → oxygen-containing organic compound+energy, hydrocarbon+O2
→ CO2/CO+H2O+ energy
7. the reversed gas injection of producing well, after oil reservoir forms continual and steady Pintsch process near the gas injection well, then pass through oil recovery
Producing well injects large quantity of air, steam into oil reservoir, when oil recovery producing well individual well air injection rate is ten thousand sides of 50-100, stops
Air is injected, 300-1000 cubic metres of hot steams are injected, further increases strata pressure, the dioxy that oxygen is generated with formation reaction
Change carbon part be dissolved in crude oil, crude oil is diluted, simultaneously as Pintsch process generate bulk gas, as carbon monoxide,
Carbon dioxide, nitrogen, vapor etc. form pneumatic jack in top of oil horizon, apply huge pressure to oil reservoir, are played to crude oil flow
Impetus.
Further, horizontal well can also be SAGD wells in step 2.
Further, can in step 4 to oil reservoir mesohigh inject chemical plugging agent, to the gas in oil reservoir leap up channel and
Small-sized fracture belt is blocked, and prevents from gas occurs when gas injection to leap up phenomenon.
Further, temperature-control pressure-control monitoring, anti-coking, burn-out-proof well guarantor are installed in horizontal well gas-injection well and horizontal well production well
Protection unit.
Claims (4)
1. a kind of liquid oxygen strong stimulation igniting air drives Pintsch process mixed phase gas flooding method, it is characterised in that include mainly following
Step：
(1) selected area update strategy rate range is in 0.2-3000 millidarcies, porosity ＞ 5, the oil reservoir of 10 DEG C of formation temperature or more, using anti-
5 points, anti-9 points or row's formula well spacing method progress well spacing；
(2) more mouthfuls of straight wells or horizontal well are set as gas injection well, more mouthfuls of straight wells or horizontal well are as oil recovery producing well；
(3) straight well is used to recover the oil, horizontal well production or straight well horizontal well coordinate the technology recovered the oil, gas injection pressure ranging from 2-45 million
Pa, individual well gas injection rate ranging from ten thousand sides of 0.1-20/day；
(4) 20% length of perforation, oil recovery producing well communication direction oil reservoir are distinguished to straight well gas injection well oil reservoir atop part and bottom
The whole perforations in part, horizontal well gas-injection well and producing well are in oil reservoir position horizontal segment section gap perforation, production bottom of recovering the oil
Electric heater unit is installed；
(5) appropriate liquid oxygen is injected to oil reservoir mesohigh direct-injection by gas injection well, makes oil reservoir Pintsch process spontaneous combustion, liquid oxygen is by high pressure injection
Device of air is directly injected to after oil reservoir bottom enters oil reservoir, is generated strong thermal chemical reaction Pintsch process in oil reservoir rapidly, is generated
A large amount of mixed phase gases make the flouring cracking hypergolic reaction of crude oil, complete spontaneous ignition；
(6) after completing spontaneous combustion electrical fire, air is injected by gas injection well immediately, the oxygen in air occurs rapidly anti-in oil reservoir
It answers, makes oil stability, Oxygenation first occurs in cracking reaction, discharge heat, then redox reaction occurs, discharge
Go out a large amount of heat and carbon dioxide, oil reservoir is made to form the high temperature for effectively controlling Pintsch process around using gas injection well as core
Band is cracked, according to oil reservoir different geological conditions and oil reservoir absorbability, adjustment day gas injection rate persistently injects air, keeps oil reservoir long-term
Effective continuous high temperature cracking；
(7) to the reversed gas injection of producing well, after oil reservoir forms continual and steady Pintsch process near the gas injection well, then pass through life of recovering the oil
Production well injects large quantity of air, steam into oil reservoir, when oil recovery producing well individual well air injection rate is ten thousand sides of 50-100, stops note
Enter air, injects 300-1000 cubic metres of hot steams, the carbon dioxide that oxygen is generated with formation reaction is partially soluble in crude oil, right
Crude oil is diluted, and the gas that Pintsch process generates forms pneumatic jack in top of oil horizon, applies huge pressure to oil reservoir, to crude oil
Flowing plays a role in promoting.
2. liquid oxygen strong stimulation igniting air according to claim 1 drives Pintsch process mixed phase gas flooding method, feature
It is, the horizontal well best results of the step (2) are SAGD wells.
3. liquid oxygen strong stimulation igniting air according to claim 2 drives Pintsch process mixed phase gas flooding method, feature
It is, the step (4) must inject chemical plugging agent to oil reservoir mesohigh, be blocked to the channel of leaping up of the gas in oil reservoir.
4. liquid oxygen strong stimulation igniting air according to claim 2 or 3 drives Pintsch process mixed phase gas flooding method, special
Sign is, temperature-control pressure-control monitoring, anti-coking, burn-out-proof well guarantor must be installed in the horizontal well gas-injection well and horizontal well production well
Protection unit.
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| CN106246148B (en) * | 2016-08-01 | 2019-01-18 | 中嵘能源科技集团有限公司 | It is a kind of using continuous pipe to the oil production method of horizontal well air injection |
| CN106223911B (en) * | 2016-08-01 | 2018-08-14 | 中嵘能源科技集团有限公司 | It is a kind of to note strong pressure-air, oxygen-enriched flooding method to deep buried hill reservoir |
| CN106089163A (en) * | 2016-08-01 | 2016-11-09 | 中嵘能源科技集团有限公司 | A kind of steam injection associating air injection and production gas well gas fire huff and puff oil recovery method |
| CN106593375A (en) * | 2016-12-01 | 2017-04-26 | 中国石油天然气股份有限公司 | Hot exploitation method for exploiting gas-cap super-heavy oil reservoirs |
| CN112761604A (en) * | 2021-01-18 | 2021-05-07 | 栾海涛 | Method for producing hydrogen and displacing oil by injecting supercritical steam and liquid oxygen into super heavy oil |
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| US4288235A (en) * | 1979-07-06 | 1981-09-08 | Stone & Webster Engineering Corporation | Low residence time solid-gas separation device and system |
| US7520325B2 (en) * | 2006-02-27 | 2009-04-21 | Geosierra Llc | Enhanced hydrocarbon recovery by in situ combustion of oil sand formations |
| CN1888381A (en) * | 2006-07-19 | 2007-01-03 | 尤尼斯油气技术（中国）有限公司 | Deep low penetrating thin oil reservoir fire flooding oil production firing method |
| CN101161988B (en) * | 2006-10-09 | 2011-07-06 | 北京联众易盛石油开采新技术发展有限公司 | In situ combustion slug and steam driving combined type crude oil producing method |
| CN101004132A (en) * | 2007-01-04 | 2007-07-25 | 中国石油大学(华东) | Exploitation technique for disgorging thick oil by pouring air to assistant steam |
| CN102242626A (en) * | 2011-07-19 | 2011-11-16 | 中国石油天然气股份有限公司 | Steam drive exploitation method for heavy oil reservoir |
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