CN108343407A - Oil, the spontaneous carbon dioxide low temperature of well mix gas plugging releasing oil displacement technology - Google Patents
Oil, the spontaneous carbon dioxide low temperature of well mix gas plugging releasing oil displacement technology Download PDFInfo
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- CN108343407A CN108343407A CN201810131067.7A CN201810131067A CN108343407A CN 108343407 A CN108343407 A CN 108343407A CN 201810131067 A CN201810131067 A CN 201810131067A CN 108343407 A CN108343407 A CN 108343407A
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- mixed gas
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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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
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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
- E21B43/164—Injecting CO2 or carbonated water
Abstract
The invention discloses a kind of oil, the spontaneous carbon dioxide low temperature of well mixes gas plugging releasing oil displacement technology, it is related to oil field development field, the technology includes oil, the spontaneous carbon dioxide low temperature of well mixes gas plugging releasing oil displacement construction technology, pass through oil first, well injects carbon dioxide de-plugging agent to stratum, then in injection mixed gas and surfactant liquid, mixed gas is that air is isolated by mixed gas separation device, mixed gas separation device controls oxygen content simultaneously, surfactant liquid extemporaneous preparation, injection mode is replaced using the mode that is continuously injected into or multistage plug, inject surfactant liquid and mixed gas, use gas liquid ratio for 1：1; circulate operation; terminate to construction; this technology is that mixing gas drive is combined with block releasing technique; realize oily, well de-plugging, decompression, augmented injection and the displacement of reservoir oil purpose; it is the novel oil production technology for integrating de-plugging, cracking, viscosity reduction and viscous crude lighting, the surfactant displacement of reservoir oil, mixed gas drive, the oil recovery of crude oil dilution method, adapts to the needs of oil field production and environmental protection.
Description
Technical field
The present invention relates to oil field development fields, and in particular to be that a kind of oil, the spontaneous carbon dioxide low temperature of well mix gas solution
Stifled technology of reservoir sweep.
Background technology
Currently, the oil reservoir development in many oil fields in China has been enter into the middle and later periods, there are water ratio in oil well height, water injection well note not into
The problem of water, oil, well expose in developing, becomes increasingly conspicuous, and input-output ratio is big, there is the problems such as taping the latent power difficulty, conventional to recover the oil
Water injection technology has been unable to meet production needs, chemical displacement of reservoir oil technology is used in order to improve recovery ratio, such as polymer displacement of reservoir oil, buck
Drive, combination flooding, surface-active displacement of reservoir oil etc., but as oil reservoir complex situations increase, chemical displacement of reservoir oil difficulty is increased, due to chemical flooding
Finish selection is difficult, such as the requirement of chemical oil displacement agent high efficiency, economy, the feature of environmental protection, requirement, the Produced Liquid processing of injected system
The problems such as, while there is alkali drive fouling, fingering in the construction process, surfactant flooding fingering, combination flooding is of high cost, injection pipe
The problems such as fouling of column and tool, note ternary composite driving be easy to cause formation blockage, and backflow waste liquid is difficult, and environmental protection pressure is big etc.
Problem, these factors limit chemical displacement of reservoir oil technology application.Simultaneously because oil field is exploited for a long time, strata pressure is made to decline, had a large amount of
Producing well formation depletion is serious, and energy is insufficient, causes many crude oil in underground to be difficult to produce, so that crude output is successively decreased soon, therefore be
Remaining Oil improves oil recovery factor, and the displacement of reservoir oil is carried out using air insufflation techiques, air insufflation techiques for example carbon dioxide injection, natural gas,
Nitrogen etc. has proved to be a kind of efficient raising recovery efficiency technique, but there are air sources for carbon dioxide injection, natural gas, nitrogen technology
Insufficient and of high cost problem, application is restricted, therefore air injection technology is more and more paid attention to, using air injection
Technology exploit light oil reservoir be a creative raising recovery ratio new technology, it the advantages of be that air source is wide, at
This is cheap, and to China mostly heterogeneous thin layer, for aclinic acline, it is simple to note due to gas string and viscous fingering
The oil displacement efficiency of air is restricted, and also leads to oxygen and channel to oil well to cause some security risks, is noted in particular with oil field
The extension of water development time, oil layer pollution affect oil well productivity, closely related with oil mining during oil field development
Technological factor and many other factors, cause near wellbore zone to pollute, as oil field third time is exploited, Exploitation degree is constantly deep
Enter, the reservoir of exploitation is in Non-primary Trunk Die Cavity, based on oil sheet and off-balancesheet layer, in the process of development, due to various factors, to cause
Near wellbore permeability declines and water injection well water sucting thickness is caused to reduce, water absorbing capacity is deteriorated, and injection allocation requirement is not achieved, makes oil well
Production capacity is not in full use, and seriously affects the effect of oil field development, and therefore, in order to solve oil removing, well near wellbore zone blocks, and carries
Oil reservoir potential is given full play to its permeability, supplement stratum energy, the patented technology " titanium dioxide that my invention country has authorized
Carbonate the raffinate not row's of returning technique after de-plugging agent and acidification ", it can release the blocking pollution problem of near wellbore zone very well, in conjunction with
Upper patented technology, the spontaneous carbon dioxide low temperature of oil, well that I has developed new suitable oil field mix gas plugging releasing oil displacement technology, just
It is to mix gas drive oil phase using acidification and hypoxemia to combine, has oil, well near wellbore zone to block using Acidizing Technology releasing, utilize foam
Hypoxemia, which mixes gas, can reduce the gentle relative permeability of water, increase oil displacement efficiency and be related to volume, can increase substantially adopting for oil reservoir
Yield and oil displacement efficiency.
Invention content
The purpose of the present invention is provide a kind of oily, mixed gas plugging releasing oil displacement of the spontaneous carbon dioxide low temperature of well regarding to the issue above
Technology, this technology are that mainly mixing gas drive is combined with block releasing technique, and oil well or water injection well are before injecting gaseous mixture, first
A certain amount of carbon dioxide acidification blocking remover is injected, which mainly can dissolve inorganic scale and wax and asphalitine, and generate
Great amount of carbon dioxide gas, while formation temperature being made to increase, to make the gaseous mixture separated in the slave air being subsequently implanted into
It is fully chemically and physically reacted with crude oil generation, de-plugging agent and gaseous mixture collective effect release the pollution on stratum and reach oil well increasing
The purpose of oil and water injection well decompression, augmented injection.Then gaseous mixture is injected into stratum by oil well or water injection well, mixing air source is main
A large amount of N in air is isolated by mixed gas separation device2、O2And CO2Mixed gas isolates sky using mixed gas separation device
O in gas2, oxygen content is controlled in 5%-8%, therefore can control O2It injects less than 8% in stratum, a large amount of N in mixed gas2It mends
Fill the energy on stratum, O2The viscosity reduction of heat and the viscosity reduction of surfactant and the viscosity reduction of reaction product are generated with the oxidation reaction of crude oil all
With displacement of reservoir oil effect, the gentle relative permeability of water can be reduced using foam, blocks high permeability zone, improve gaseous mixture heterogeneous
Flow condition in oil reservoir controls gas fingering, reduces gas-liquid yield ratio, postpones the break through of gas, increases oil displacement efficiency
And swept volume, to increase substantially the recovery ratio of oil reservoir.The technology solves chemical existing for chemical displacement of reservoir oil technology
Oil displacement agent selection is difficult, such as chemical oil displacement agent high efficiency, economy, feature of environmental protection requirement, requirement, the Produced Liquid processing of injected system
The problems such as, while there is alkali drive fouling, fingering in the construction process, the problems such as surfactant flooding fingering, combination flooding is of high cost,
Solve the problems, such as that air insufflation techiques exist simultaneously, the air source as existing for carbon dioxide injection, natural gas, nitrogen is insufficient and of high cost
Problem, also solving simple air injection, there are has channelings and viscous fingering, cause oxygen to channel to oil well and cause some security risks.Together
When solve the oil field production problem of formation depletion and water injection well difficult water injection, therefore oil, the spontaneous carbon dioxide low temperature of well are mixed
Gas block releasing technique be de-plugging, cracking viscosity reduction and viscous crude lighting, surfactant flooding, mixed gas drive, the oil recovery of crude oil dilution method in
Novel, efficient, the inexpensive oil recovery technique of one, it adapts to the needs of oil field production, adapts to the needs of environmental protection.
The present invention is achieved through the following technical solutions：Gas plugging releasing oil displacement is mixed including oil, the spontaneous carbon dioxide low temperature of well
What construction technology was realized, a certain amount of carbon dioxide acidification blocking remover is injected to stratum by oil well or water injection well first, then
It is the N that air is isolated by mixed gas separation device in injection mixed gas and surfactant liquids, mixed gas2、O2With
CO2Mixed gas, at the same by mixed gas separation device control mixed gas oxygen content, surfactant liquids extemporaneous preparation,
Injection mode is replaced using the mode that is continuously injected into or multistage plug, surfactant liquids and mixed gas are injected, using gas liquid ratio
It is 1:1, circulate operation, until construction terminates.
The oxygen content of the mixed gas is 5% ~ 8%, the oxygen content ＜ 8% in stratum.
The gas liquid ratio is 1:1 is mixed gas volume and surfactant liquids volume ratio under formation pressure.
Oil, the spontaneous carbon dioxide low temperature of well mix the operational procedure of gas plugging releasing oil displacement construction technology：
1, well site prepares, the facility of wellhead assembly and wellsite is oil-proof, gas leakage, and notice production crew installs well head before constructing
Equipment, water injection well are fixed with wire cable anchor；
（1）To the above casing of gas injection packer carry out clear water pressure testing, after meeting the requirements can gas injection, casing pressure test 20mPa, voltage stabilizing
30min, it is qualification that pressure drop, which is less than 0.5mPa,；
（2）Cementing quality is reexamined, needs to meet gas injection intensity requirement；
（3）During tubing string tripping in, oil pipe thread junction, which need to apply, wipes stop-leak compound, and pipe wire buckle winds sealant tape；
（4）Packer bears pressure difference up and down and is intended to reach requirement, meets the higher demand of gas injection pressure；
（5）After tubing string is setting, clear water to well head or less 100m or so is filled in oil jacket annular space；
（6）Before construction, all valves of production tree and tubing and casing are checked, find to loosen fastening in time, the timely replacement of damage, peace
Charge of oil, set pressure gauge, pipeline pressure resistance 30mPa；
2, injection device is installed：
（1）Other than air compressor, proportioning pump or pump truck are mounted on away from well head 20m, injection pipeline uses the pipe of pressure resistance 30mPa
Line, and install；
（2）Power supply unit type selecting and installation, the special power supply unit that injection, output flow use（Transformer, power distribution cabinet, cable
Deng）, meet power requirements, the special power supply units such as construction period air compressor, pump, system heat preservation, household electricity and be mounted on
Near oil well or the affiliated measuring station of injection well（3-5）At rice；
（3）The emptying design of construction period production fluid gas, oil well produced fluid are put into interim gathering and transferring process, output gas into overhead opening
Slack tank, casing gas are vented into blow-down pipe；
（4）Construction well group surveys production profile, construction well changes decentralized wellhead, and casing installs blow-down pipe, it is desirable that drain is away from well head
At 25m, pressure gauge and sampler are installed；
Field personnel should be far from pressure line when 3, constructing, and irrelevant personnel should be far from well site；
4, solution is prepared：Match liquid with water injection well water or tap water, high temperature foam agent and room temperature foaming agent is being added with liquid pool, is matching
Control surface activating agent liquid is spare；Well construction 10-15m31-2 are matched liquid with liquid pool；
5, start injection device I first（Pump truck）A certain amount of carbon dioxide acidification blocking remover is injected to stratum；
6 and then in injection mixed gas and surfactant liquids, use gas liquid ratio for 1:1, first use injection device I（Pump truck）
A certain amount of surfactant liquids are injected, separation equipment is then started（Mixed gas separation device）With injection device II（Air compressor machine）
Inject a certain amount of mixed gas, mixed gas separation device controls the oxygen content of mixed gas in 5%-8%, using being continuously injected into mode
Or multistage plug replaces injection mode, surfactant liquids and mixed gas, circulate operation is injected, until construction terminates；
7, the direct metaideophone of water injection well after the completion of constructing, by oil reservoir requirement injection allocation water filling；Oil well closing well 4-6 hours, then turns pumping
Production.
The beneficial effects of the invention are as follows：The present invention is a kind of oily, mixed gas plugging releasing oil displacement skill of the spontaneous carbon dioxide low temperature of well
Art, this technology are that mixing gas drive technology is combined with acidification block releasing technique, first before oil well or water injection well injection gaseous mixture
A certain amount of carbon dioxide acidification blocking remover is first injected, which mainly can dissolve inorganic scale and wax and asphalitine, de-plugging
Agent and gaseous mixture collective effect release the pollution on stratum and achieve the purpose that oil well and increase oil, water injection well decompression and augmented injection；Then lead to
It crosses oil well, water injection well and injects low-oxygen gas mixture body and surfactant solution into stratum, achieve the purpose that plugging releasing oil displacement, simultaneously
It solves stratum liquid deficit and water injection well note is not intake, make low production efficiency and the production problem of well closing well.
The displacement of reservoir oil energy that the present invention uses is low-oxygen gas mixture body, and note low-oxygen gas mixture body is conducive to keep strata pressure,
There is certain elastic potential energy after injecting stratum, supplement the energy on stratum, the flexible drive of gas plays good gaslift, the row of helping
It is acted on the displacement of reservoir oil.
The low-oxygen gas mixture that the present invention injects oil reservoir knows from experience the oilhole road preferentially occupied in porous media, and entering water can not
The stratum of entrance, the original crude oil in bound state, which is displaced duct, becomes flowable crude oil, while occupying top oil reservoir, increases
Add oil displacement pressure, to improve oil displacement efficiency, reduces residual oil saturation.
The present invention injects low-oxygen gas mixture body and the crude oil oxicracking lighting of oil reservoir, and oxidation generates carbon dioxide and heat
Amount enhances crude oil flow performance, reduces viscosity of crude.Crude oil oxidation generates surface reactive material, forms surfactant flooding,
Improve Development Response of Oilfield.
The displacement effect of the present invention：Low-oxygen gas mixture body, oil, water three-phase form emulsion, reduce the viscosity of crude oil, to
Oil displacement efficiency is improved, occurs Gravity Separation between the fluid and reservoir fluid of injection, non-phase-mixing driving is formed, oil reservoir can be improved and exist
Longitudinal development degree, so as to improve development effectiveness.
The technology of the present invention is to be effectively bonded together the advantages of gas drive and chemical flooding, is not only improved due to gas and water
Viscous fingering caused by viscosity differences controls gas fingering, reduces gas-liquid yield ratio, postpones the break through of gas, increases
Oil displacement efficiency and swept volume, while the gentle relative permeability of water can be reduced using foam, high permeability zone is blocked, mixing is improved
Flow condition of the gas in non-homogeneous pay, to increase substantially the recovery ratio of oil reservoir.
The technology of the present invention is efficient, inexpensive, ecological, environmental protective oil recovery technique, and the raw material used have efficient
Property, economy, safe ecological, environmental protective, with the performance easily injected, the low-oxygen gas mixture source of injection relies primarily on mixed gas separation
Device isolates a large amount of N in air2、O2And CO2Mixed gas, it is extensive and at low cost using air source, and gas drive and chemical flooding are simultaneously
It carries out, reduces production cost, the air source and surfactant ecological, environmental protective used will not pollute stratum, note simultaneously
It is convenient to enter, and meets the needs of oil field.
The technology of the present invention is safety and environmental protection technology, in construction note low-oxygen gas mixture drives oil recovery process, ensures air compressor machine
It works under conditions of safely and effectively, controls rational gas injection speed, ensure that oxidation reaction can occur completely for oxygen in stratum,
Accomplish effectively to monitor in stratum and production, ensure the oxygen content in producing well in safe range, since hypoxemia mixes
Gas drive and chemical flooding are combined, and solving simple air injection, there are has channelings and viscous fingering, while solving since oxygen channels to
Oil well causes the problem of some security risks.
The technology of the present invention is to mix gas drive oil phase using acidification de-plugging and hypoxemia to combine, and dissolves plugging technique solution using Compound-acid
Oil removing, well near wellbore zone block, increase the permeability and formation temperature on stratum, make gaseous mixture carry chemical agent preferably into
In the machine matter for entering oil reservoir, physical and chemical reaction occurs with crude oil, increases oil displacement efficiency and swept volume, oil can be increased substantially
The recovery ratio of Tibetan.
The technology of the present invention is acidification de-plugging, cracking viscosity reduction and viscous crude lighting, surfactant flooding, mixed gas drive, original
Oily dilution method is recovered the oil in novel, the efficient inexpensive oil recovery technique of one, it adapts to the needs of oil field production, adapts to environment and protects
The needs of shield.
Description of the drawings
Fig. 1 is that the spontaneous carbon dioxide low temperature of well of the present invention mixes gas plugging releasing oil displacement construction technology figure
In figure：1 water injection well, 2 air compressor machines, 3 mixed gas separation devices, 4 distributing room for water injection water tubing strings, 5 de-plugging agent material-compound tanks, 6 surfaces are lived
Property agent return with liquid pool, 7 production valves, 8 dose out powders penstocks, 9 and wash valve, 10 pump trucks.
Fig. 2 is that the spontaneous carbon dioxide low temperature of oil well of the present invention mixes gas plugging releasing oil displacement construction technology figure
In figure：1 oil well, 2 air compressor machines, 3 mixed gas separation devices, 4 water-tank lorries, 5 de-plugging agent material-compound tanks, 6 surfactants match liquid
Pond, 7 pump trucks, 8 sleeve valves.
Below in conjunction with example, the invention will be further described：
Embodiment 1
The present invention is that a kind of oil, the spontaneous carbon dioxide low temperature of well mix gas plugging releasing oil displacement technology, first by water injection well to stratum
A certain amount of carbon dioxide acidification blocking remover is injected, is then in injection mixed gas and surfactant liquids, mixed gas
The N that air is isolated by mixed gas separation device2、O2And CO2Mixed gas, while gaseous mixture is controlled by mixed gas separation device
The oxygen content of body, surfactant liquids extemporaneous preparation replace injection mode using the mode that is continuously injected into or multistage plug, inject table
Face activating agent liquid and mixed gas, use gas liquid ratio for 1:1 circulate operation, until construction terminates.
Oil, the spontaneous carbon dioxide low temperature of well mix the operational procedure of gas plugging releasing oil displacement construction technology：
1, well site prepares, the facility of wellhead assembly and wellsite is oil-proof, gas leakage, and notice production crew installs well head before constructing
Equipment, water injection well are fixed with wire cable anchor；
（1）To the above casing of gas injection packer carry out clear water pressure testing, after meeting the requirements can gas injection, casing pressure test 20mPa, voltage stabilizing
30min, it is qualification that pressure drop, which is less than 0.5mPa,；
（2）Cementing quality is reexamined, needs to meet gas injection intensity requirement；
（3）During tubing string tripping in, oil pipe thread junction, which need to apply, wipes stop-leak compound, and pipe wire buckle winds sealant tape；
（4）Packer bears pressure difference up and down and is intended to reach requirement, meets the higher demand of gas injection pressure；
（5）After tubing string is setting, clear water to well head or less 100m or so is filled in oil jacket annular space；
（6）Before construction, all valves of production tree and tubing and casing are checked, find to loosen fastening in time, the timely replacement of damage, peace
Charge of oil, set pressure gauge, pipeline pressure resistance 30mPa；
2, injection device is installed：
（1）Other than air compressor, proportioning pump or pump truck are mounted on away from well head 20m, injection pipeline uses the pipe of pressure resistance 30mPa
Line, and install；
（2）Power supply unit type selecting and installation, the special power supply unit that injection, output flow use（Transformer, power distribution cabinet, cable
Deng）, meet power requirements, the special power supply units such as construction period air compressor, pump, system heat preservation, household electricity and be mounted on
Near oil well or the affiliated measuring station of injection well（3-5）At rice；
（3）The emptying design of construction period production fluid gas, oil well produced fluid are put into interim gathering and transferring process, output gas into overhead opening
Slack tank, casing gas are vented into blow-down pipe；
（4）Construction well group surveys production profile, construction well changes decentralized wellhead, and casing installs blow-down pipe, it is desirable that drain is away from well head
At 25m, pressure gauge and sampler are installed；
Field personnel should be far from pressure line when 3, constructing, and irrelevant personnel should be far from well site；
4, solution is prepared：Match liquid with water injection well water, fetched water by distributing room for water injection water tubing string 4, high temperature foam is being added with liquid pool
It is spare to prepare surfactant liquids for agent and room temperature foaming agent；
5, start injection device I first（Pump truck 10）A certain amount of carbon dioxide acidification blocking remover is injected to stratum；
6 and then in injection mixed gas and surfactant liquids, use gas liquid ratio for 1:1, first use injection device I（Pump truck
10）A certain amount of surfactant liquids are injected, separation equipment is then started（Mixed gas separation device 3）With injection device II（It is empty
Press 2）A certain amount of mixed gas is injected, mixed gas separation device controls the oxygen content of mixed gas in 5%-8%, using continuous note
Enter mode, surfactant liquids and mixed gas, circulate operation is injected, until construction terminates；
7, the direct metaideophone of water injection well after the completion of constructing, by oil reservoir requirement injection allocation water filling.
The using effect of embodiment 1：In August, 2010 mixes gas in Liaohe oilfield oil, the spontaneous carbon dioxide low temperature of well
Block releasing technique constructs to water injection well, due to water injection well injection carbon dioxide acidification blocking remover, low-oxygen gas mixture and surface
Living solution releases formation blockage, realizes augmented injection, the dynamic change for well group of constructing, water injection pressure is up to before constructing
13.5mPa, day water distribution quantity 80m3, and the amount of being actually implanted into 20m3, well water filling layer blocking is serious, substantially notes and does not intake, Wo Men
Should be into using the mode that is continuously injected into, injection carbon dioxide acidification blocking remover, low-oxygen gas mixture and surfactant solution are initial to note
It is 19mPa to enter pressure, and using high injection pressure, after injecting a period of time, pressure drops to 14mPa, completes to note by detail design
Enter amount, water injection rate reaches 80m after construction3, water injection pressure stabilization is in 7mPa, the pollution of releasing near wellbore zone and blocking, by applying
Work improves the intake profile of the water filling layer, and corresponding oil well majority surface casing pressure increases, and well air content increases, take 1 mouthful of oil well into
It has gone and has taken gas sample, be oxygen content analysis, the equal ＜ 1.0% of on-the-spot test air guide oxygen content, well below the control of air guide oxygen content
Index ＜ 8%, before the well group gas injection, a line well group daily oil production drops to 16.2t/d by 21.7t/d, after gas injection daily oil production by
16.2t/d is raised to 20.6t/d, and daily oil production is stablized in 16.2t/d or so at present, controls well group yield downward trend, moves
Liquid level averagely rises 250m, and highest rises 500m, and daily fluid production rate is maintained at 228m3More than, see apparent effect, two wires well
Daily oil production drops to 10.4t/d by 16.1t/d before group construction, and daily average oil production drops to 5.7 t/d in 5 months,
Daily oil production is raised to 13.2t/d by 10.4t/d after gas injection, and daily oil production is stablized in 12t/d or so at present, controls well group production
Downward trend is measured, apparent effect has been seen.
Embodiment 2
The present invention is that a kind of oil, the spontaneous carbon dioxide low temperature of well mix gas plugging releasing oil displacement technology, first by water injection well to stratum
A certain amount of carbon dioxide acidification blocking remover is injected, is then in injection mixed gas and surfactant liquids, mixed gas
The N that air is isolated by mixed gas separation device2、O2And CO2Mixed gas, while gaseous mixture is controlled by mixed gas separation device
The oxygen content of body, surfactant liquids extemporaneous preparation, oil recovery are continuously injected into mode or multistage plug alternating injection mode, inject table
Face activating agent liquid and mixed gas, use gas liquid ratio for 1:1 circulate operation, until construction terminates.
Oil, the spontaneous carbon dioxide low temperature of well mix the operational procedure of gas plugging releasing oil displacement construction technology：
1, well site prepares, the facility of wellhead assembly and wellsite is oil-proof, gas leakage, and notice production crew installs well head before constructing
Equipment, water injection well are fixed with wire cable anchor；
（1）To the above casing of gas injection packer carry out clear water pressure testing, after meeting the requirements can gas injection, casing pressure test 20mPa, voltage stabilizing
30min, it is qualification that pressure drop, which is less than 0.5mPa,；
（2）Cementing quality is reexamined, needs to meet gas injection intensity requirement；
（3）During tubing string tripping in, oil pipe thread junction, which need to apply, wipes stop-leak compound, and pipe wire buckle winds sealant tape；
（4）Packer bears pressure difference up and down and is intended to reach requirement, meets the higher demand of gas injection pressure；
（5）After tubing string is setting, clear water to well head or less 100m or so is filled in oil jacket annular space；
（6）Before construction, all valves of production tree and tubing and casing are checked, find to loosen fastening in time, the timely replacement of damage, peace
Charge of oil, set pressure gauge, pipeline pressure resistance 30mPa；
2, injection device is installed：
（1）Other than air compressor, proportioning pump or pump truck are mounted on away from well head 20m, injection pipeline uses the pipe of pressure resistance 30mPa
Line, and install；
（2）Power supply unit type selecting and installation, the special power supply unit that injection, output flow use（Transformer, power distribution cabinet, cable
Deng）, meet power requirements, the special power supply units such as construction period air compressor, pump, system heat preservation, household electricity and be mounted on
Near oil well or the affiliated measuring station of injection well（3-5）At rice；
（3）The emptying design of construction period production fluid gas, oil well produced fluid are put into interim gathering and transferring process, output gas into overhead opening
Slack tank, casing gas are vented into blow-down pipe；
（4）Construction well group surveys production profile, construction well changes decentralized wellhead, and casing installs blow-down pipe, it is desirable that drain is away from well head
At 25m, pressure gauge and sampler are installed；
Field personnel should be far from pressure line when 3, constructing, and irrelevant personnel should be far from well site；
4, solution is prepared：Match liquid with water injection well water, fetched water by distributing room for water injection water tubing string 4, high temperature foam is being added with liquid pool
It is spare to prepare surfactant liquids for agent and room temperature foaming agent；
5, start injection device I first（Pump truck 10）A certain amount of carbon dioxide acidification blocking remover is injected to stratum；
6 and then in injection mixed gas and surfactant liquids, use gas liquid ratio for 1:1, first use injection device I（Pump truck
10）A certain amount of surfactant liquids are injected, separation equipment is then started（Mixed gas separation device 3）With injection device II（It is empty
Press 2）A certain amount of mixed gas is injected, mixed gas separation device controls the oxygen content of mixed gas in 5%-8%, using multistage plug
Alternately injection mode injects surfactant liquids and mixed gas, circulate operation, until construction terminates；
7, the direct metaideophone of water injection well after the completion of constructing, by oil reservoir requirement injection allocation water filling.
The using effect of embodiment 2：In June, 2013 mixes gas in Liaohe oilfield oil, the spontaneous carbon dioxide low temperature of well
Block releasing technique constructs to water injection well, the dynamic change for well group of constructing, and before well group construction, most wells yield declines,
Aqueous rising, individual wells are connected to, and water breakthrough occurs, and well group yield drops to 15t/d, application on June 25th, 2013 by 42t/d
Oil, the spontaneous carbon dioxide low temperature of well mix gas block releasing technique and are constructed, and are initially injected well injection removal of bridge formation agent, then note
Enter low-oxygen gas mixture and surfactant solution, which injects 4 slugs using multistage plug alternating injection mode, initial note of constructing
It is 3mPa to enter pressure, and injection rate is completed by detail design, and injection average pressure is stablized in 10mPa, and mixed gas is made uniformly to promote,
The generation for preventing too early has channeling, after construction, water injection pressure is stablized in 7mPa or so, and water injection rate is maintained at wanting for injection allocation
It asks,
Improve the intake profile of the water filling layer by construction, corresponding well water declines, and improves recovery ratio, and corresponding oil well is most
Surface casing pressure increases, and well air content increases, and takes 1 mouthful of oil well to carry out taking gas sample, has done oxygen content analysis, on-the-spot test air guide oxygen
The equal ＜ 1.0% of content, well below the Con trolling index ＜ 8% of air guide oxygen content, the corresponding oil well of the well group is with obvious effects, the well group
Daily fluid production rate rises to 107.7t/d by 41t/d before gas injection, and daily oil production is raised to 6.6t/d by 4.4t/d, continues 5 months, mesh
Day before yesterday stable yield is producing, and adds up to increase oil 300t, hydrodynamic face rises to 1940m by 1036m highests, it is seen that is practicing
During oil, the spontaneous carbon dioxide low temperature of well mix gas block releasing technique, oil displacement efficiency and coefficient are improved, with the extension of time,
Application effect can be more obvious.
Embodiment 3
The present invention is a kind of oily, mixed gas plugging releasing oil displacement technology of the spontaneous carbon dioxide low temperature of well, is noted first to stratum by oil well
Enter a certain amount of carbon dioxide acidification blocking remover, then in injection mixed gas and surfactant liquids, mixed gas is empty
The N that gas is isolated by mixed gas separation device2、O2And CO2Mixed gas, while mixed gas is controlled by mixed gas separation device
Oxygen content, surfactant liquids extemporaneous preparation, using multistage plug alternating injection mode injection surfactant liquids and mixed
Gas is closed, uses gas liquid ratio for 1:1 circulate operation, until construction terminates.
Oil, the spontaneous carbon dioxide low temperature of well mix the operational procedure of gas plugging releasing oil displacement construction technology：
1, well site prepares, the facility of wellhead assembly and wellsite is oil-proof, gas leakage, and notice production crew installs well head before constructing
Equipment；
（1）To the above casing of gas injection packer carry out clear water pressure testing, after meeting the requirements can gas injection, casing pressure test 20mPa, voltage stabilizing
30min, it is qualification that pressure drop, which is less than 0.5mPa,；
（2）Cementing quality is reexamined, needs to meet gas injection intensity requirement；
（3）During tubing string tripping in, oil pipe thread junction, which need to apply, wipes stop-leak compound, and pipe wire buckle winds sealant tape；
（4）Packer bears pressure difference up and down and is intended to reach requirement, meets the higher demand of gas injection pressure；
（5）After tubing string is setting, clear water to well head or less 100m or so is filled in oil jacket annular space；
（6）Before construction, all valves of production tree and tubing and casing are checked, find to loosen fastening in time, the timely replacement of damage, peace
Charge of oil, set pressure gauge, pipeline pressure resistance 30mPa；
2, injection device is installed：
（1）Other than air compressor, proportioning pump or pump truck are mounted on away from well head 20m, injection pipeline uses the pipe of pressure resistance 30mPa
Line, and install；
（2）Power supply unit type selecting and installation, the special power supply unit that injection, output flow use（Transformer, power distribution cabinet, cable
Deng）, meet power requirements, the special power supply units such as construction period air compressor, pump, system heat preservation, household electricity and be mounted on
Near oil well or the affiliated measuring station of injection well（3-5）At rice；
（3）The emptying design of construction period production fluid gas, oil well produced fluid are put into interim gathering and transferring process, output gas into overhead opening
Slack tank, casing gas are vented into blow-down pipe；
（4）Construction well group surveys production profile, construction well changes decentralized wellhead, and casing installs blow-down pipe, it is desirable that drain is away from well head
At 25m, pressure gauge and sampler are installed；
Field personnel should be far from pressure line when 3, constructing, and irrelevant personnel should be far from well site；
4, solution is prepared：It draws tap water to match liquid with water-tank lorry, high temperature foam agent and room temperature foaming agent is being added with liquid pool, with tabulation
Face activating agent liquid is spare；
5, start injection device I first（Pump truck 7）A certain amount of carbon dioxide acidification blocking remover is injected from casing to stratum；
6 and then in injection mixed gas and surfactant liquids, use gas liquid ratio for 1:1, first use injection device I（Pump truck 7）
A certain amount of surfactant liquids are injected, separation equipment is then started（Mixed gas separation device 3）With injection device II（Air compressor machine
2）A certain amount of mixed gas is injected, mixed gas separation device is controlled the oxygen content of mixed gas in 5%-8%, replaced using multistage plug
Injection mode injects surfactant liquids and mixed gas, circulate operation, until construction terminates from casing；
7, then oil well closing well 4-6 hours after the completion of constructing turns pumping production.
The using effect of embodiment 3：2010 low in Liaohe Oil Field dawn oil recovery factory application oil, the spontaneous carbon dioxide of well
The mixed gas block releasing technique of temperature has carried out test construction of handling up to daybreak 1-42-039 oil wells, implements time September 29 to October 2, is somebody's turn to do
Well sandstone thickness 32.9m, the number of plies 16 completes carbon dioxide acidification blocking remover injection rate according to detail design dosage, gaseous mixture is noted
Enter amount, surfactant injection rate, the well daily fluid production rate rises to 4t/d by 0t/d before gas injection after construction, and daily oil production is by 0t/d
It is raised to 1.4t/d, aqueous 65% after gas injection, 317 days production times, current daily production rate stabilization is producing, and adds up to increase oil 444t, increase
Liquid 1268t, oil increasing effect is apparent, the line well closed on after daybreak 1-42-039 wells note gaseous mixture（Daybreak 141038, daybreak 14139, daybreak
142038）With two wires well（Daybreak 14239C, daybreak 141039）Increase oil 18t, 13t, 17.4t, 99t, 21.6t respectively, adds up to 169t.
Same period liquid level test data before and after measure was compared with the upper same period in period, and the sinking rate of pump significantly improves, and was illustrated by noting gaseous mixture
Afterwards, the expansion energy of air supplements stratum energy, the fluid supply capacity of oil well is improved, by Liaohe Oil Field daybreak 1-42-039 wells
Offset well casing gas monitors, and on 1 day ~ November 19 October in 2010, oxygen content is 0.00% ~ 0.24% in casing gas, is substantially existed
0.10% or so variation, well below 8%, reaches construction safety requirement, opening well and making production：Oxygen content in monitoring tube gas, oxygen content
＜ 8% can normal opening well and making production.
Claims (4)
1. it includes oil, the spontaneous carbon dioxide low temperature of well that a kind of oil, the spontaneous carbon dioxide low temperature of well, which mix gas plugging releasing oil displacement technology,
Mixed gas plugging releasing oil displacement construction technology, is characterized in that：The oil, the spontaneous carbon dioxide low temperature of well mix gas plugging releasing oil displacement and construct work
Skill injects a certain amount of carbon dioxide acidification blocking remover by oil well or water injection well to stratum first, then in injection gaseous mixture
Body and surfactant liquids, mixed gas are the N that air is isolated by mixed gas separation device2、O2And CO2Mixed gas, together
When by mixed gas separation device control mixed gas oxygen content, surfactant liquids extemporaneous preparation, using the side of being continuously injected into
Formula or multistage plug replace injection mode, inject surfactant liquids and mixed gas, use gas liquid ratio for 1:1, circulate operation,
Terminate to construction.
2. oil, the spontaneous carbon dioxide low temperature of well mix gas plugging releasing oil displacement technology according to claim 1, it is characterised in that：Institute
The oxygen content of mixed gas is stated 5% ~ 8%, the oxygen content ＜ 8% in stratum.
3. oil, the spontaneous carbon dioxide low temperature of well mix gas plugging releasing oil displacement technology according to claim 1, it is characterised in that：Institute
It is 1 to state gas liquid ratio:1 is mixed gas volume and surfactant liquids volume ratio under formation pressure.
4. oil, the spontaneous carbon dioxide low temperature of well mix gas plugging releasing oil displacement technology according to claim 1, it is characterised in that：Institute
Stating the operational procedure of the mixed gas plugging releasing oil displacement construction technology of oil, the spontaneous carbon dioxide low temperature of well is：（1）Well site prepares, well head fills
It sets and does not answer oil leak, gas leakage with the facility of wellsite, notice production crew installs wellhead equipment, water injection well steel wire before constructing
Line anchor is fixed；A, to the above casing of gas injection packer carry out clear water pressure testing, after meeting the requirements can gas injection, casing pressure test 20mPa,
Voltage stabilizing 30min, it is qualification that pressure drop, which is less than 0.5mPa,；B, cementing quality is reexamined, needs to meet gas injection intensity requirement；C, tubing string
During tripping in, oil pipe thread junction, which need to apply, wipes stop-leak compound, and pipe wire buckle winds sealant tape；D, packer is born
Upper and lower pressure difference is intended to reach requirement, meets the higher demand of gas injection pressure；E, after tubing string is setting, clear water is filled extremely in oil jacket annular space
100m or so below import；F, before construction, all valves of production tree and tubing and casing are checked, find to loosen fastening in time, damage
Timely replacement, installation oil, set pressure gauge, pipeline pressure resistance 30mPa；（2）Injection device is installed：A, air compressor, proportioning pump
Or other than pump truck is mounted on away from well head 20m, injection pipeline uses the pipeline of pressure resistance 30mPa, and installs；B, power supply unit type selecting and
Installation, the special power supply unit that injection, output flow use（Transformer, power distribution cabinet, cable etc.）, meet construction period air pressure
The power requirements such as contracting machine, pump, system heat preservation, household electricity, special power supply unit are mounted on oil well or the affiliated measuring station of injection well
Near（3-5）At rice；C, construction period production fluid gas emptying design, oil well produced fluid into interim gathering and transferring process, output gas into
Overhead opening blow-down tank, casing gas are vented into blow-down pipe；D, construction well group surveys production profile, construction well changes decentralized wellhead, covers
Pipe installs blow-down pipe, it is desirable that at 25 meters away from well head of drain, installs pressure gauge and sampler；（3）Work on the spot when construction
Personnel should be far from pressure line, and irrelevant personnel should be far from well site；（4）Prepare solution：Match liquid with water injection well water or tap water,
High temperature foam agent and room temperature foaming agent is added with liquid pool, it is spare to prepare surfactant liquids；Well construction 10-15m3 1-2
It is a to match liquid with liquid pool；（5）Start injection device I first（Pump truck）A certain amount of carbon dioxide acidification blocking remover is injected to stratum；
（6）Then in injection mixed gas and surfactant liquids, use gas liquid ratio for 1:1, first use injection device I（Pump truck）Injection
A certain amount of surfactant liquids, then start separation equipment（Mixed gas separation device）With injection device II（Air compressor machine）Injection
A certain amount of mixed gas, mixed gas separation device control the oxygen content of mixed gas in 5%-8%, using the mode that is continuously injected into or more
Slug replaces injection mode, surfactant liquids and mixed gas, circulate operation is injected, until construction terminates；（7）Construction is completed
The direct metaideophone of water injection well afterwards, by oil reservoir requirement injection allocation water filling；Then oil well closing well 4-6 hours turns pumping production.
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