CN110055044B - A kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system and its application - Google Patents
A kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system and its application Download PDFInfo
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- CN110055044B CN110055044B CN201910380765.5A CN201910380765A CN110055044B CN 110055044 B CN110055044 B CN 110055044B CN 201910380765 A CN201910380765 A CN 201910380765A CN 110055044 B CN110055044 B CN 110055044B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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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
Abstract
The invention discloses a kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system and its applications, preparation method includes the following steps, with alkylolamides, alkyl phenol polyoxyethylene ether sulfonate, N, N '-methylene-bisacrylamide, acrylamide, vinyl pyrrolidone and deionized water prepare aqueous phase solution, oil-phase solution is mutually prepared with oil with oleic acid, by the two, hybrid reaction is made under the action of inert gas atmosphere and initiator, Double regulating displacement system produced by the present invention is when being applied to high temperature and high salt heterogeneous reservoir chemical flooding, oil water interfacial tension can be reduced to 10‑2~10‑3MN/m, when moisture content is lower than 90%, dual adjustment and control system can emulsified crude oil form water-in-oil emulsion, viscosity is above underground crude oil viscosity；The drop size of emulsion is controllable, improves reservoir heterogeneity by Jamin effect, while coupling regulation with microballoon, significantly improves high temperature and high salt heterogeneous reservoir recovery ratio.
Description
Technical field
The present invention relates to belong to oilfield chemistry and oil field development technical field, and in particular to a kind of high temperature and high salt oil deposit is dual
Transfer drive system and its application.
Technical background
Many old fileds come into mid-later development phase at present, and Produced Liquid High water cut is the serious of long-standing problem oilfield exploitation
Problem, how effective water and oil control be oil field development at this stage vital task.Chemical displacement of reservoir oil technology has become old filed control water
Steady oil and the main means for further increasing oil recovery factor, and be widely used in conventional oil reservoir.These chemistry
Drive technology specifically include that polymer flooding, alkali drive, surfactant flooding, poly-/table binary drive, poly-/alkali/table ternary composite driving and
Polynary foam composite flooding etc..However for high temperature and high salt and the stronger oil reservoir of heterogeneity, the application of these chemical flooding technologies is still
So there is certain limitation, be mainly shown as: 1) heat and salt resistance of polymer is limited, and the system containing polymer is suitable only for
Middle low temperature and low mineralization oil reservoir；2) for alkali drive under the conditions of high calcium/magnesium, alkali scale formation is serious, damages to stratum；3) it steeps
Although foam drive can be in high temperature and high salt oil deposit application, in the strong oil reservoir of heterogeneity, foam can be produced along preferential path
Out；4) heat and salt resistance of part of the surface activating agent is good, but in the stronger reservoir of heterogeneity, flow phenomenon of leaping up is serious.
A large amount of laboratory experiments and field test prove that polymer microballoon can effectively improve formation heterogeneity, expand
Involve water phase swept volume.Temperature and salinity influence its adaptability smaller simultaneously, and dosage is few at low cost, and validity period is long, special
Not Shi Yongyu high temperature and high salt heterogeneous reservoir, but it is non-if Reservoir Heterogeneity is too strong, polymer microballoon improves stratum
The reduced capability of matter cannot well adapt to oil reservoir.
Summary of the invention:
The present invention proposes a kind of high temperature and high salt heterogeneous reservoir Double regulating for deficiency existing for current oil field chemical flooding
Displacement system can either make up the limitation that conventional polymer microballoon uses, and can be improved economic benefit.
In order to achieve the above objectives, the present invention the following technical schemes are provided:
A kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system, by percentage to the quality, using including following raw material
It is made:
A, oily phase: 40%~70%,
Oleic acid: 0.5%~2%,
B, water-soluble monomer:
Alkylolamides: 6%~8%,
Alkyl phenol polyoxyethylene ether sulfosalt surfactant: 1%~2%,
Acrylamide (AM): 10%~20%,
Vinyl pyrrolidone (NVP): 1%~3%,
N, N '-methylene-bisacrylamide (MBA): the 0.1%~0.4% of water-soluble monomer gross mass,
C, initiator: the 0.01%~0.05% of water-soluble monomer gross mass,
D, remaining is deionized water；
The preparation of the transfer drive system the following steps are included:
(1) aqueous phase solution is prepared: by acrylamide, vinyl pyrrolidone, N, N '-methylene-bisacrylamide, alkyl
Alkylolamides and alkyl alcohol ethoxylates sulfosalt surfactant are add to deionized water, stirring to solution clear,
It is spare.
(2) oil-phase solution is prepared: oleic acid is added in oily phase, is evenly stirred until solution clear, it is spare.
(3) preparation of emulsion system: oil-phase solution is added to three mouthfuls of mechanical stirring, inert gas entrance/outlet
In flask, under the high speed machine stirring condition of 800r/min~1000r/min, aqueous phase solution is slowly added to oil-phase solution
In, start to be passed through inert gas 30min after being added completely, so that emulsion system is in deoxygenation conditions, then reduces mechanical stirring speed
Rate heats up three-necked flask to 45 DEG C~50 DEG C after initiator is added again, reacts 2h~3h, formed poly- to 200min~400r/min
Close dual adjustment and control system of the object Microsphere Size at 0.1 μm~100 μm.
Further, the oil is mutually at least one of kerosene, white oil, diesel oil.
Further, the inert gas is one of helium, nitrogen or argon gas.
Further, the alkylolamides skeleton symbol are as follows:
CnH2n+1CON(CH2CH2OH)
Wherein, n is 11~15.
Further, the alkyl phenol polyoxyethylene ether sulfonate structures skeleton symbol are as follows:
Wherein, it is 10~40 that m, which is 8~10, o,.
A kind of application of high temperature and high salt heterogeneous reservoir Double regulating displacement system is also disclosed in the present invention, which are mainly applied to
In the chemical flooding of high temperature and high salt heterogeneous reservoir.
Compared with existing transfer drive system, the method have the advantages that:
1, oil water interfacial tension can be reduced to 10 by Double regulating displacement system-2~10-3MN/m is lower than 90% in moisture content
When, dual adjustment and control system emulsified crude oil and can form the emulsion of Water-In-Oil.
2, emulsion viscosity in moisture content difference is also different, and its viscosity is above underground crude oil viscosity, when aqueous
When rate is within the scope of 30%-90%, the viscosity of emulsion is the several times of Crude viscosity, shows good mobility self-control.
3, the drop size of emulsion is controllable, improves reservoir heterogeneity by Jamin effect, while tune is coupled with microballoon
Control further improves the heterogeneity of oil reservoir, significantly improves high temperature and high salt heterogeneous reservoir recovery ratio.
Detailed description of the invention:
Fig. 1, polymer microballoon transfer drive experiment effect figure；
Fig. 2, Double regulating displacement system transfer drive test effect figure.
Specific embodiment:
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Below with reference to embodiment and attached drawing, invention is further explained, but does not limit the present invention.
Embodiment 1:
(1) preparation of high temperature and high salt heterogeneous reservoir Double regulating displacement system
Experiment need to prepare oil-phase solution liquid compatible with water respectively, and oil-phase solution is the mixed system of white oil and oleic acid, water phase
Solution is the mixing of deionized water, acrylamide, vinyl pyrrolidone, alkylolamides and N,N methylene bis acrylamide
System.
(1) preparation of oil, aqueous phase solution
Oil-phase solution: measuring white oil 60mL, oleic acid 2g, and ultrasonic agitation is uniformly mixed.
Aqueous phase solution: deionized water 40mL, acrylamide 15g, vinyl pyrrolidone 2g and N, N- di-2-ethylhexylphosphine oxide are measured
Acrylamide 0.4g, alkylolamides 8g, ultrasonic agitation is to being completely dissolved.
(2) preparation of reverse micro emulsion
A, oil-phase solution is added in three-necked flask, aqueous phase solution is slowly added to oil under the mixing speed of 900r/min
In phase solution, the time control of dropwise addition connects source nitrogen in 30min, after being added dropwise and is stirred for 30min；
B, mixing speed is reduced to 400r/min, is slowly added to 1% azo diisobutyl amidine HCI solution 2mL, it is complete
After full addition, system temperature is increased to 48 DEG C, sustained response 3 hours to get the dual transfer drive of high temperature and high salt heterogeneous reservoir
System.
(2) performance test:
1, the ability of the reduction interfacial tension of dual adjustment and control system
Preparation salinity is that (Ca2+, Mg2+ are dense by 50000mg/L (Ca2+, Mg2+ concentration are 500mg/L) and 100000mg/L
Degree is each 100mL of simulated formation water of 1500mg/L), and the above-mentioned system of 1g is then added, stirs evenly, utilizes under the conditions of 90 DEG C
TX500C rotary interface tensiometer tests the stable interface tension value between dual adjustment and control system and different crude oils.Experimental result such as table
Shown in 1, oil water interfacial tension value can be reduced to 10 by dual adjustment and control system-2~10-3MN/m, the present invention show good
Wash oil character.
The ability of the dual adjustment and control system of table 1 reduction interfacial tension
2, the emulsifying capacity of dual adjustment and control system
Preparation salinity is that (Ca2+, Mg2+ are dense by 50000mg/L (Ca2+, Mg2+ concentration are 500mg/L) and 100000mg/L
Degree is 1500mg/L) each 100mL of simulated formation water, the above-mentioned system of 1g is then added, stirs evenly, according to different proportion and former
Oil mixing, is put into the three-necked flask with magnetic stirring apparatus, is 90 DEG C in temperature, stirs under the speed that stirring rate is 400r/min
1h is mixed, measures emulsion types after stirring, utilizes the viscosity of high temperature and pressure Anton Paar rheometer test emulsion.Experimental result
As shown in table 2: when moisture content is less than or equal to 90%, oil-water emulsion forms WO emulsion, and its viscosity is all larger than original
Oily viscosity；When moisture content is within the scope of 30%-90%, the viscosity of emulsion is the several times of Crude viscosity, is shown good
Mobility self-control.
The emulsifiability of table 2 Double regulating displacement system and crude oil (viscosity 9.8mPas)
3, the ability of the transfer drive of dual adjustment and control system
System prepares: preparation salinity is the simulated formation water of 100000mg/L (Ca2+, Mg2+ concentration are 1500mg/L)
100mL is then added the above-mentioned system of 1g, stirs evenly.
Dual regulation for the performance of comparative study polymer microballoon system and dual adjustment and control system, in Example 1
System 50mL, drying obtains polymer microballoon after being demulsified using ethyl alcohol, and the 1g polymer microballoon is taken to be added to the above-mentioned mould of 100mL
Comparative experiments is done in quasi- water flooding.
Experimental temperature: 90 DEG C
Oil Displacing Capacity: being 15 in permeability grade, low permeability cores permeability is 300mD's by two-in-parallel core experiment
Under the conditions of, when first water drive to moisture content is 98%, 0.5PV system is injected, then carry out subsequent waterflooding, experimental result such as Fig. 1 and Fig. 2
It is shown.
The experimental results showed that polymer microballoon drives and subsequent waterflooding can be improved for single polymer microballoon system
Hypertonic recovery of core 18.6% improves hypotonic recovery ratio 18.5%；And dual adjustment and control system can be improved hypertonic rock core harvesting
Rate 16.3% improves low permeability cores recovery ratio 31.6%, it was demonstrated that the displacement performance on the strong stratum of heterogeneity is obviously excellent
In polymer microballoon system.
Above-mentioned specific embodiment is described in detail method of the invention in conjunction with attached drawing, but the present invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, as long as be no more than main scope of the invention in, can be to experiment condition and analysis side
Method and object are flexibly changed, within these are all belonged to the scope of protection of the present invention.
Claims (5)
1. a kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system, which is characterized in that by percentage to the quality, using including
Following raw material is made:
A, oily phase: 40%~70%,
Oleic acid: 0.5%~2%,
B, water-soluble monomer:
Alkylolamides: 6%~8%,
Alkyl phenol polyoxyethylene ether sulfosalt surfactant: 1%~2%,
Acrylamide: 10%~20%,
Vinyl pyrrolidone: 1%~3%,
N, N '-methylene-bisacrylamide: the 0.1%~0.4% of water-soluble monomer gross mass,
C, initiator: the 0.01%~0.05% of water-soluble monomer gross mass,
D, remaining is deionized water；
Specific preparation process is as follows for the transfer drive system:
(1) aqueous phase solution is prepared: by acrylamide, vinyl pyrrolidone, N, N '-methylene-bisacrylamide, alkylol acyl
Amine and alkyl alcohol ethoxylates sulfosalt surfactant are add to deionized water, stirring to solution clear；
(2) oil-phase solution is prepared: oleic acid being added in oily phase, is evenly stirred until solution clear；
(3) preparation of emulsion system: oil-phase solution is added to mechanical stirring, inert gas entrance/outlet three-necked flask
In, under the stirring condition of 800r/min~1000r/min, aqueous phase solution is added drop-wise in oil-phase solution, time for adding is
30min starts to be passed through inert gas 30min after being added completely into so that emulsion system is in deoxygenation conditions, 200min~
Under the stirring condition of 400r/min, it is warming up to 45 DEG C~50 DEG C again after initiator is added, reaction 2h~3h to obtain the final product.
2. a kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system according to claim 1, which is characterized in that described
Initiator is azo-bis-isobutyrate hydrochloride, and the oil is mutually at least one of kerosene, white oil, diesel oil, the inert gas
For one of helium, nitrogen or argon gas.
3. a kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system according to claim 1, which is characterized in that described
Alkylolamides skeleton symbol are as follows:
CnH2n+1CON(CH2CH2OH)2
Wherein, n is 11~15.
4. a kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system according to claim 1, which is characterized in that described
The skeleton symbol of alkyl phenol polyoxyethylene ether sulfonate are as follows:
Wherein, it is 10~40 that m, which is 8~10, o,.
5. a kind of high temperature and high salt heterogeneous reservoir Double regulating displacement system according to any one of claims 1-4 is in high temperature and high salt
Application in heterogeneous reservoir chemical flooding.
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| CN110776899B (en) * | 2019-11-26 | 2022-09-13 | 西南石油大学 | High-temperature high-salinity oil reservoir in-situ emulsification and viscosification system and application thereof |
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