CN104777273B - Third-order shear method for determining performance parameter of polymer solution for oil displacement - Google Patents
Third-order shear method for determining performance parameter of polymer solution for oil displacement Download PDFInfo
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- CN104777273B CN104777273B CN201510188183.9A CN201510188183A CN104777273B CN 104777273 B CN104777273 B CN 104777273B CN 201510188183 A CN201510188183 A CN 201510188183A CN 104777273 B CN104777273 B CN 104777273B
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Abstract
The invention relates to a third-order shear method for determining a performance parameter of a polymer solution for oil displacement. The method comprises the following steps: 1) preparing a to-be-determined polymer solution a0, wherein the to-be-determined polymer solution a0 is a solution composed of oil field water and polymer dry powder in any mixing proportion; 2) performing the first-order shear on the to-be-determined polymer solution a0 by virtue of a WARING stirrer to obtain a polymer solution a1 after the first-order shear, determining viscosity, condensate size, microstructure, rheological property, resistance coefficient, residual resistance coefficient and oil displacement effect of the polymer solution a1; 3) performing the second-order shear on the polymer solution a1 by virtue of a shear simulation device at an immediate vicinity of wellbore to obtain the polymer solution a2 after the second-order shear, determining above relative parameters of the polymer solution a2; 4) performing the third-order shear on the polymer solution a2 by virtue of a core shear simulation device to obtain a polymer solution a3 after the third-order shear, and determining relative parameters of the polymer solution a3.
Description
Technical field
The present invention relates to be used for determining the experimental technique of Polymer Used For Oil Displacement solution property parameter, more particularly to one kind is used for
Determine the three-level cutting method of Polymer Used For Oil Displacement solution property parameter.
Background technology
With the continuous development of countries in the world economy, the demand of petroleum resources is also grown with each passing day, more visited no
In the case that bright oil and gas reserves increases, it is unique effective way to improve the rate of oil and gas recovery.And polymer flooding exactly improves recovery ratio
In most widely used method.Improve mobility ratio by injection of polymer solution in stratum and improve swept volume, and then
Improve oil recovery factor.And the problem of the maximum faced during polymer solution injects stratum is shear degradation.Polymerization
The shear degradation of thing solution directly results in the hydraulic performance decline of polymer solution, affects the effect of polymer flooding, gives oil exploitation band
Carry out adverse effect.Therefore, many researchers are devoted to the exploitation of Shearing Resistant Polymer.
The performance parameter of the performance parameter of polymer solution, especially polymer solution under actual reservoir condition is polymerization
Thing drives the key point of conceptual design.And the viscosity of the polymer solution under actual reservoir condition, rheological characteristic, resistance and remaining resistance
The isoparametric acquiring way of force coefficient is broadly divided into scene and obtains and lab simulation.Wherein, scene obtains and refers in injection well
Sampling, the row's of returning sampling or the sampling of drill sampling well.Interior can only by polymer solution be simulated shearing can just obtain its
Performance parameter in actual formation.The reasonability of lab simulation cutting method directly influences polymer solution in reality with accuracy
The accuracy of performance parameter in the stratum of border, further affects Polymer Flooding Reservoirs scheme, dynamic tracking, the conjunction of oil displacement efficiency prediction
Rationality and accuracy.At present, lab simulation cutting method mainly has the shearing of WARING agitators, rock core shearing, near wellbore zone mould
Draft experiment device is sheared.Wherein, the shearing of WARING agitators is pure mechanical shearing to the shearing of polymer solution, and is polymerized
The cut mode that thing solution is subject in the earth formation is different, and the shearing to polymer solution does not meet the practical situation of oil reservoir；And it is sharp
The reality that the shearing to polymer solution meets near wellbore zone stratum is sheared near wellbore zone analogue experiment installation, but can only be simulated
The suffered shearing in the stratum of near wellbore zone of polymer solution, can not intactly reflect that the whole that polymer solution is subject to is cut
Cut；Rock core shearing to a certain extent can be with shearing that simulating polymer solution is subject to, but cutting of can simulating of this cut mode
Cutting speed rate is not continually varying, is only suitable for the shearing of certain point in simulated formation.
In sum, the cutting method that current lab simulation is related to is carried out under single cut mode, not
The shearing experienced in injection process by polymer solution can be reflected completely, though having referring to property, also had from actual value
Certain gap.
The content of the invention
The technical problem to be solved in the present invention is to provide and a kind of can accurately determine the three of Polymer Used For Oil Displacement performance parameter
Level shearing experiment method, can be the screening of polymer and performance evaluation, polymer flooding conceptual design, polymer by this method
Drive numerical simulation and tracking evaluation etc. to provide closer to actual, accurate parameter value and decision-making foundation.
For solving above-mentioned technical problem, the technical solution used in the present invention is：
A kind of three-level cutting method for determining Polymer Used For Oil Displacement solution property parameter, comprises the steps：
1) polymer solution a0 to be measured is prepared, polymer solution a0 to be measured is oil field water NL and polymer dry powder by arbitrarily ratio
The solution of example mixing；
2) first order shearing is carried out using WARING agitators to polymer solution a0 to be measured, is obtained Jing after first order shearing
Polymer solution a1, determine the viscosity of polymer solution a1, agglomerate size, microstructure, rheological property, resistance coefficient,
Residual resistance factor, oil displacement efficiency；
3) second level shearing is carried out using near wellbore zone shearing simulation device to polymer solution a1, obtains the Jing second level and cut
Polymer solution a2 after cutting, the viscosity of measure polymer solution a2, agglomerate size, microstructure, rheological property, resistance system
Number, residual resistance factor, oil displacement efficiency；
4) third level shearing is carried out using rock core shearing simulation device to polymer solution a2, is obtained Jing after third level shearing
Polymer solution a3, determine the viscosity of polymer solution a3, agglomerate size, microstructure, rheological property, resistance coefficient,
Residual resistance factor, oil displacement efficiency.
Preferably, in above-mentioned technical proposal, step 1) in prepare aqueous solutions of polymers to be measured and comprise the steps：
1. measure oil field water；
2. weigh polymer dry powder；
3. stirring oil field water makes to form whirlpool, and polymer dry powder is added within 30s apart from whirlpool center 2/3～3/4
Enter in the water of oil field, persistently stir, all dissolving stops stirring making polymer, obtains polymer solution a0 to be measured.
Preferably, in above-mentioned technical proposal, step 2) in polymer solution a1 acquisition methods it is as follows：By polymerization to be measured
Thing solution a0 pours in WARING agitators to fall after the rotating speed stirring 5s～25s of I grade of 3500r/min or II grade of 7000r/min
Go out, obtain the polymer solution a1 Jing after first order shearing after its natural froth breaking；Wherein, when WARING agitator speeds are with stirring
Between together decide on shear strength, shear strength is equal to the corresponding stratum shear strength of Oil Field.
Preferably, in above-mentioned technical proposal, step 3) in polymer solution a2 filled by near wellbore zone shearing simulation
Obtain after the experimental provision shearing put, experimental provision includes the oil field water container and polymer solution reservoir of parallel connection, the oil field water capacity
Device and polymer solution reservoir co-portal end connect a container by pump, and oil field water container and polymer solution reservoir go out jointly
Mouth end is connected with shearing simulation device, and shearing simulation device is that near wellbore zone shearing simulation device or rock core shearing simulation are filled
Put, between oil field water container and polymer solution reservoir conjoint outlet end and shearing simulation device, be provided with pressure transducer, pressure
Sensor is connected with pressure acquisition system, and shearing simulation device outfan is provided with a sampler barrel, and oil field water container and polymer are molten
Liquid container is respectively arranged at the two ends with a valve.
Preferably, in above-mentioned technical proposal, step 3) in fill and present near wellbore zone shearing simulation device and comprise the steps：
1. preforation tunnel is filled and presented, is filled and presented using 40 mesh～60 mesh quartz sands, tap and be urged to porosity existing equal to oil field
The porosity on the corresponding stratum in field near wellbore zone, preforation tunnel is screwed firmly；
2. gravel packing zone is filled and presented, is filled and presented using 40 mesh～60 mesh quartz sands, make porosity be equal to the nearly well ground of Oil Field
Porosity with corresponding stratum；
3. wire-wrapped screen is installed, the device inversion for completing will be filled and presented, and be filled and presented compaction band and near wellbore zone stratum successively；Fill and present
Compaction band adopts quartz sand mesh number for 100 mesh～120 mesh, makes porosity be equal to the hole on the corresponding stratum in Oil Field near wellbore zone
Degree；Near wellbore zone stratum is filled and presented using 40 mesh～80 mesh, 80 mesh～120 mesh quartz sands according to Oil Field near wellbore formation equivalent layer
Two kinds of quartz sands ratio mixing fill and present, make porosity be equal to the corresponding stratum in Oil Field near wellbore zone porosity.
Preferably, in above-mentioned technical proposal, step 3) in polymer solution a2 acquisition methods it is as follows：
1. installation fills and presents the near wellbore zone shearing simulation device for completing in the experimental provision；
2. polymer solution reservoir two ends valve is closed, oil field water container two ends valve is opened, pump is opened, is not more than
The flow velocity of 10mL/min injects near wellbore zone shearing simulation device to there are flowing out；
3. oil field water container two ends valve is closed, polymer solution reservoir two ends valve is opened, polymer solution a1 is noted
Enter in the shearing simulation device of near wellbore zone, depending on the injection flow velocity of polymer solution a1 is according to the injection index of Oil Field, then
The injection flow velocity of pump is scaled, it is the shearing of the Jing second level to receive after at least 10PV by the solution of near wellbore zone shearing simulation device
Polymer solution a2 afterwards.
Preferably, in above-mentioned technical proposal, step 4) in polymer solution a3 acquisition methods it is as follows：
1. the rock core equal with oil recovery field reservoir permeability is actually treated is chosen, is clamped on core holding unit, installed
In experimental provision；
2. the valve at oil field water container two ends is opened, the valve at polymer solution reservoir two ends is closed, pump is opened, with little
Oil field water is injected to there are flowing out in the speed of 1mL/min to the rock core in core holding unit；
3. the valve at oil field water container two ends is closed, the valve at polymer solution reservoir two ends is opened, by polymer solution
In rock core in a2 injection core holding units, depending on the injection flow velocity of polymer solution a2 is according to the injection index of Oil Field,
The injection flow velocity of pump is scaled again, and it is the polymer solution Jing after third level shearing to receive after at least 10PV by the solution of rock core
a3。
Preferably, in above-mentioned technical proposal, polymer solution a1, polymer solution a2, the viscosity of polymer solution a3
Determined by viscometer, polymer solution a1, polymer solution a2, the agglomerate size of polymer solution a3 pass through light scattering apparatuss
Determine, polymer solution a1, polymer solution a2, the microstructure of polymer solution a3 pass through scanning electron microscope, atomic force microscopy
Sem observation, polymer solution a1, polymer solution a2, the rheological property of polymer solution a3 are by rheometer test, polymer
Solution a1, polymer solution a2, the resistance coefficient of polymer solution a3, residual resistance factor and oil displacement efficiency pass through displacement test
Determine.
Compared with prior art, the beneficial effects of the present invention is：The assay method of the present invention is will be polymer to be measured molten
Liquid flows through first order shearing simulation experimental provision, second level shearing simulation experimental provision, third level shearing simulation experiment dress successively
Put, and determine each performance parameter for shearing post-consumer polymer solution per one-level, can be polymerized by the performance parameter for obtaining
The screening of thing and performance evaluation, polymer flooding conceptual design, polymer flooding numerical simulation and tracking evaluation；First order shearing simulation
Experimental provision is subject to mechanical shearing, such as curing tank to stir in process of injection allocation using Wu Yin agitator shearing simulation polymer solutions
Mix the shearing in device shearing, surface line and down-hole oil tube；Polymer after the shearing of first order shearing simulation experimental provision
Solution again through the shearing of second level shearing simulation experimental provision, sheared using near wellbore zone by second level shearing simulation experimental provision
What analogue experiment installation simulating polymer solution was subject to when the stratum of near wellbore zone shears；Fill through secondary shear simulation experiment
The polymer solution after shearing is put again through the shearing of third level shearing simulation experimental provision, third level shearing simulation experimental provision
Using rock core shearing simulation device, simulating polymer solution is driven into shearing that earth formation deep is subject to, the measure that the present invention is provided
The experimental technique of oil polymer, by the shear action of different layers, closer to shearing situation of the actual oil field to polymer, makes
The performance parameter of the polymer solution that must be determined is more accurate, solves single simulation shearing and determines inaccurate, deviates actual feelings
The problem of condition, more solves the problems, such as the on-site measurement wasted time and energy.Therefore, the property of the polymer solution for being obtained by the present invention
The energy parameter more accurate, scope of application is wider, can set with performance evaluation, polymer flooding scheme for the screening of polymer solution
Meter, polymer flooding numerical simulation and tracking evaluation etc. are provided closer to actual parameter value and decision-making foundation.
Description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the flow chart of the present invention；
Fig. 2 is experimental provision structural representation used by second level shearing of the present invention；
Fig. 3 is experimental provision structural representation used by third level shearing of the present invention；
Fig. 4 is 1 structural representation of displacement test analog in the present invention；
Fig. 5 is 2 structural representation of displacement test analog in the present invention.
Specific embodiment
The present invention provide a kind of three-level cutting method for determining Polymer Used For Oil Displacement solution property parameter, including with
Lower step：
1) prepare polymer solution a0 to be measured：
1. measure oil field water；
2. weigh polymer dry powder；
3. stirring oil field water makes to form whirlpool, and polymer dry powder is added within 30s apart from whirlpool center 2/3～3/4
Enter in the water of oil field, persistently stir, all dissolving stops stirring making polymer, obtains polymer solution a0 to be measured.
2) obtain the polymer solution a1 Jing after first order shearing：Pour polymer solution a0 to be measured into WARING agitators
Pour out after interior rotating speed stirring 5s～25s with I grade of 3500r/min or II grade of 7000r/min, obtain the polymer after first order shearing
Solution a1；Wherein, WARING agitator speeds together decide on shear strength with mixing time, and shear strength is equal to Oil Field phase
Answer stratum shear strength；
The viscosity of polymer solution a1 is determined using Brookfield viscometers, the solidifying of polymer is determined using light scattering apparatuss
Aggressiveness size, the microstructure for determining polymer solution a1 using scanning electron microscope, atomic force microscope, it is poly- using rheometer measurement
The rheological property of polymer solution a1, determines resistance coefficient, residual resistance factor and the drive of polymer solution a1 using displacement test
Oily effect.
3) obtain the polymer solution a2 Jing after the shearing of the second level：It is molten to polymer using near wellbore zone shearing simulation device
Liquid a1 carries out second level shearing.
As shown in Fig. 2 the experimental provision that shearing simulation device shearing near wellbore zone is related to includes the oil field water container 1 of parallel connection
With polymer solution reservoir 2, oil field water container 1 and 2 co-portal end of polymer solution reservoir connect a container 4, oil by pump 3
Water in field container 1 and 2 conjoint outlet end of polymer solution reservoir are connected near wellbore zone shearing simulation device 5,1 He of oil field water container
Pressure transducer 32, pressure sensing are provided between 2 conjoint outlet end of polymer solution reservoir and near wellbore zone shearing simulation device 5
Device 32 is connected with pressure acquisition system 31, and shearing simulation device 5 outfan near wellbore zone is provided with sampler barrel 6, oil field water container and
Polymer solution reservoir is respectively arranged at the two ends with a valve 7.
Fill and present near wellbore zone shearing simulation device to comprise the steps：
1. preforation tunnel 51 is filled and presented, is filled and presented using 40 mesh～60 mesh quartz sands, porosity is tapped and be urged to equal to oil field
The porosity on the corresponding stratum in live near wellbore zone, preforation tunnel 51 is screwed firmly；
2. gravel packing zone 52 is filled and presented, is filled and presented using 40 mesh～60 mesh quartz sands, make porosity be equal to the nearly well of Oil Field
The porosity on the corresponding stratum in area；
3. wire-wrapped screen 53 is installed, the device inversion for completing will be filled and presented, and be filled and presented compaction band 54 and near wellbore zone stratum successively
55；Fill and present compaction band 54 and quartz sand mesh number is adopted for 100 mesh～120 mesh, make porosity be equal to Oil Field near wellbore zone corresponding
The porosity on stratum；Fill and present near wellbore zone stratum 55 near according to Oil Field using 40 mesh～80 mesh, 80 mesh～120 mesh quartz sands
The ratio mixing of two kinds of quartz sands of well stratum equivalent layer is filled and presented, and makes porosity be equal to the corresponding stratum in Oil Field near wellbore zone
Porosity.
The near wellbore zone shearing simulation device cutting method of polymer solution a1 comprises the steps：
1. installation fills and presents the near wellbore zone shearing simulation device 5 for completing in experimental provision；
2. 2 two ends valve 7 of polymer solution reservoir is closed, 1 two ends valve 7 of oil field water container is opened, pump 3 is opened, with not
Flow velocity more than 10mL/min injects near wellbore zone shearing simulation device 5 to there are flowing out；
3. 1 two ends valve 7 of oil field water container is closed, 2 two ends valve 7 of polymer solution reservoir is opened, by polymer solution
In a1 injection near wellbore zone shearing simulation devices 5, polymer solution a1's injects flow velocity according to the injection index of Oil Field
Fixed, then be scaled the injection flow velocity of pump 3, it is Jing the to receive after at least 10PV by the solution of near wellbore zone shearing simulation device 5
Polymer solution a2 after secondary shear.
4. the viscosity of polymer solution a2 is determined using Brookfield viscometers, determines polymer using light scattering apparatuss
Agglomerate size, the microstructure for determining polymer solution a2 using scanning electron microscope, atomic force microscope, using rheometer measurement
The rheological property of polymer solution a2, using displacement test determine the resistance coefficient of polymer solution a2, residual resistance factor and
Oil displacement efficiency.
4) obtain the polymer solution a3 after third level shearing：Is carried out to polymer solution a2 using rock core cutting method
Three-level is sheared.
As shown in figure 3, the experimental provision that rock core cutting method is related to includes the oil field water container 1 and polymer solution of parallel connection
Container 2, oil field water container 1 and 2 co-portal end of polymer solution reservoir connect a container by pump 3, oil field water container 1 and poly-
3 conjoint outlet end of polymer solution container is connected with core holding unit 56, is clamped with rock core 57, the oil field water capacity in core holding unit 56
Pressure transducer 32, pressure transducer 32 are provided between device 1 and 2 conjoint outlet end of polymer solution reservoir and core holding unit 56
Pressure acquisition system 31 is connected with, the outfan of core holding unit 56 is provided with sampler barrel 6, oil field water container 1 and polymer solution
Container 2 is respectively arranged at the two ends with a valve 7.
The rock core cutting method of polymer solution a2 comprises the steps：
1. the rock core 57 equal with oil recovery field reservoir permeability is actually treated is chosen, is clamped on core holding unit 56,
It is installed in experimental provision；
2. the valve 7 at 1 two ends of oil field water container is opened, the valve 7 at 2 two ends of polymer solution reservoir is closed, pump 3 is opened,
Oil field water is injected to there are flowing out to be not more than the speed of 1mL/min to the rock core 57 in core holding unit 56；
3. the valve 7 at 1 two ends of oil field water container is closed, the valve 7 at 2 two ends of polymer solution reservoir is opened, by polymer
In rock core 57 in solution a2 injection core holding units 56, the injection flow velocity of polymer solution a2 is strong according to the water suction of Oil Field
Depending on degree, then the injection flow velocity of pump 3 is scaled, it is Jing after the third level is sheared to receive after at least 10PV by the solution of rock core 57
Polymer solution a3.
4. the viscosity of polymer solution a2 is determined using Brookfield viscometers, determines polymer using light scattering apparatuss
Agglomerate size, the microstructure for determining polymer solution a2 using scanning electron microscope, atomic force microscope, using rheometer measurement
The rheological property of polymer solution a2, using displacement test determine the resistance coefficient of polymer solution a2, residual resistance factor and
Oil displacement efficiency.
Embodiment：
It is below by taking certain oil field as an example, concrete to introduce provided by the present invention for determining Polymer Used For Oil Displacement solution property parameter
Three-level shearing experiment method：
In the present embodiment, experimental apparatus and material are specific as follows：
(1) viscometer：III viscometers of Brookfield DV-, the production of Brookfield companies of the U.S..Test condition：Shearing
Speed is 7.34s-1；Different model rotor test scope such as table 1.
The viscosity measurement scope of 1 different rotor of table
| Rotor | 00# | 61# | 62# | 63# | 31# |
| Rotating speed (r/min) | 6 | 18.5 | 18.8 | 27.3 | 21.6 |
| Shear rate (s-1) | 7.34 | 7.37 | 7.4 | 7.35 | 7.34 |
| Range of viscosities (mPa s) | 0～100 | 100～320 | 100～1500 | >1500 | 100～1389 |
(2) electronic balance：Range 20g～3000g, precision 0.01g；
(3) water bath with thermostatic control, 20 DEG C～100 DEG C of constant temperature scope, precision ± 2 DEG C；
(4) overhead stirrer：Rotating speed 50r/min～500r/min；
(5) WARING (Wu Yin) agitator：I grade of rotating speed 3500r/min, II grade of rotating speed 7000r/min；
(6) displacement test analog 1,2：Such as Fig. 4, Fig. 5；
1. electric heating air blast cyclic drying constant temperature oven 80,90：25 DEG C～90 DEG C of temperature range, precision ± 1 DEG C；
2. high speed and high pressure pump 81,91：One single pump maximum pump discharge 40mL/min, minimum injection rate 0.01mL/min, highest note
Enter pressure 50MPa；Another single pump maximum pump discharge 400mL/min, minimum injection rate 0.1mL/min, highest injection pressure 20MPa；
3. intermediate receptacle 86,87,88,96,97：Capacity is respectively 500mL, 1000mL, 5000mL, maximum working pressure (MWP)
30MPa；
4. fill out sand tube 84,94：Internal diameter 2.5cm, length 10cm；Internal diameter 3.8cm, length 50cm；
(7) near wellbore zone shearing simulation device, such as Fig. 2；
(8) rock core shearing simulation device, such as Fig. 3；
(9) light scattering apparatuss；
(9) scanning electron microscope, atomic force microscope；
(10) flow graph；
(11) other apparatus：10L buckets, 1L beakers, Glass rod etc. are some.
Experimental procedure is specific as follows：Polymer solution preparation temperature is 45 DEG C, and the temperature for determining viscosity and displacement test is
65℃；
1st, prepare polymer solution to be measured：
(1) prepare oil field water：
According to the referred to as live oil field water in water source of certain oil field prepared polymer, its compound method is shown in Table 2：
Table 2 certain Oil Field oil field water
| Ion is constituted | Na+、K+ | Ca2+ | Mg2+ | CO3 2 | HCO3 ? | SO4 2 | Cl? | TDS |
| Content (mg/L) | 3091.96 | 276.17 | 158.68 | 14.21 | 311.48 | 85.29 | 5436.34 | 9374.12 |
The content of various salt in required oil field water is drawn by conversion, 3 are shown in Table：
Table 3 certain oil field simulation oil water in field
| Composition | NaCl | KCl | Na2CO3 | NaHCO3 | Na2SO4 | CaCl2 | MgCl2 .6H2O | Total salinity |
| Content (mg/L) | 7341.9 | 66.0 | 25.1 | 428.9 | 126.1 | 764.7 | 1327.0 | 9374.13 |
Prepare the chemical drugss of mixture water：NaCl (analysis is pure), KCl (analysis is pure), Na2CO3(analysis is pure), NaHCO3(point
Analysis it is pure), Na2SO4(analysis is pure), CaCl2(analysis is pure), MgCl2·6H2O (analysis is pure).
1. according to water analysis table 2 and table 3, the quality of corresponding salt is weighed according to the amount prepared, by calcium salt, magnesium
Salt dissolves together, and other salt dissolve together；
2., under conditions of overhead stirrer rotating speed is 200r/min, two class saline solution are added in bucket simultaneously.Will
Solution is slowly added into the shoulder of whirlpool produced by stirring, prevents precipitation, and addition is finished, after continuing stirring a period of time,
Place stand-by.As simulation oil water in field is identical with live oil field water, simulation oil water in field is replaced with oil field water in the text.
(2) prepare polymer solution a0 to be measured：In the present embodiment, polymer solution a0 to be measured is that concentration is respectively 1250mg/
The polymer solution of each 10L of L, 1500mg/L, 1750mg/L, 2000mg/L, 2250mg/L.These polymer solution concentrations are all little
In 5000mg/L, and concentration species is more, first prepares mother solution, then the corresponding liquid concentration energy for being diluted to polymer solution to be measured
Enough save the plenty of time, because can quickly form uniform solution after polymer mother liquor dilution, if each concentration polymer to be measured is molten
Liquid is respectively adopted addition polymer dry powder and prepares, then can take more time, and the solution of each concentration prepares time length also not
Together, in order to accelerate experiment progress, preferably first prepared polymer mother solution prepares polymer solution a0 to be measured again.
Following steps are by taking the polymer solution a0 to be measured of 1250mg/L as an example.
1) prepare the mother solution of the concentration for 5000mg/L of polymer solution a0 to be measured：
1. the mother solution volume needed for preparing polymer solution a0 to be measured is calculated according to experiment desired concn, sees formula (1)：
In formula：
WsPolymer mother liquor volume, L；
WdThe volume of polymer solution a0 to be measured, L；
CdThe concentration of polymer solution a0 to be measured, mg/L；
CspPolymer mother liquor concentration, mg/L；
It is 2.5L to prepare mother solution volume needed for the polymer solution a0 to be measured of 1250mg/L；
2. oil field water volume W needed for preparing polymer solution a0 to be measured is calculated as formula (2)bd, unit L.
Wbd=Wd-Ws (2)
Be computed needed for oil field water volume be 7.5L；
3. the oil field water of 2.5L is weighed, is poured in bucket, treat that water insulation in oil field is risen to certain oil field oil field water by water bath with thermostatic control
Temperature；
4. 12.5g polymer dry powders are weighed；
5. using overhead stirrer and make that its stirring vane is located at below liquid level 2/3rds at, and adjust rotating speed
Carry out strong mixing, make whirlpool body extend into the 75% of solution, polymer dry powder is sprinkling upon the shoulder of vortex in 30s, i.e., away from
Away from whirlpool center 2/3；
6. add, then arm-type agitator speed is adjusted for 400r/min, in perseverance
The lower agitating solution 2h of temperature；
7. after stirring terminates, resulting solution is stood into 12h, if checking without undissolved granule, obtains required mother solution, if
Have, then prepare again mother solution.
2) prepare polymer solution a0 to be measured：
1. measure the oil field water of 7.5L；
2. take it is aging after the polymer mother liquor 2.5L of 5000mg/L mix with oil field water 7.5L, water temperature is maintained at oil field water
Temperature, stirs complete to the dilution of perusal solution with agitator, obtains testing the polymer solution a0 to be measured of desired concn.
The polymer solution to be measured of other concentration is prepared with same steps.
2nd, WARING (Wu Yin) shearing experiment：
(1) the polymer solution a0 to be measured of 300mL a certain concentration is poured in WARING agitators；
(2) under WARING agitator I shelves, polymer solution is stirred into 20s；
(3) polymer solution after stirring is stood into froth breaking under reservoir temperature, obtains polymer solution a1；
(4) in reservoir temperature and shear rate 7.34s-1It is apparent viscous before and after the lower a1 stirrings of measure polymer solution respectively
Degree；
Apparent viscosity retention rate is calculated by formula (3).
In formula：
RvApparent viscosity retention rate, %；
η0And ηtApparent viscosity value under reservoir temperature before and after polymer solution stirring, is drawn by viscosity meter,
mPa·s。
3rd, near wellbore zone shearing experiment：
(1) near wellbore zone shearing simulation device is filled and presented：
Near wellbore zone shearing simulation experimental provision such as Fig. 2, near wellbore zone shearing simulation device various pieces is taken out, successively
Fill and present, specifically fill and present step as follows：
1. preforation tunnel 51 is taken out, is filled and presented using 40 mesh～60 mesh quartz sands, is rapped and press under 10, each dosage keeps one
Cause, porosity is controlled 37% or so；
2. the preforation tunnel 51 filled and presented is twisted, fills and presents gravel packing zone 52, using 40 mesh～60 mesh quartz sands, hole
Degree is controlled 37%；
3. wire-wrapped screen 53 is put, device is inverted, fill and present compaction band 54 and near wellbore zone stratum 55；Compaction band 54, stone
100 mesh～120 mesh of sand mesh number, porosity are controlled 23% or so；Near wellbore zone stratum 55, using 40 mesh～80 mesh, 80 mesh
The mixing of～120 mesh quartz sands is filled and presented, and porosity is controlled 29% or so.
(2) shearing of polymer solution a1
1. Fig. 2 connection experimental provision flow processs, pressure testing are pressed：Experimental provision flow process least significant end valve is closed, pump is opened, if pump is aobvious
The pressure for showing reaches 5MPa, and the phenomenon of leakage does not occur in each interface of flow process, then flow process good airproof performance, and pressure testing terminates, and starts experiment；
2. with the membrane filtration oil field water that aperture is 0.45 μm to oil field clarification of water, saturated oils water in field observes pressure sensing
Device 32, to the steady rear termination of pumping of pressure；
3. polymer solution a1 is loaded into polymer solution reservoir, in injection index 20m3Under the conditions of/(m d), i.e. pump speed
356mL/min, shear polymer solution solution a1, sample after injection 10PV, obtain final product polymer solution a2, and 3000mL is standby for sampling；
4. in 65 DEG C of temperature, shear rate 7.34s-1Under conditions of determine near wellbore zone shear post-consumer polymer solution a2 table
Viscosity is seen, apparent viscosity retention rate is calculated by formula (3).
4th, rock core shearing experiment：
1. press Fig. 3 and core holding unit 56 and rock core 57 are installed；
2. with the membrane filtration oil field water that aperture is 0.45 μm；
3. oil field water and polymer solution a2 are respectively charged in polymer solution reservoir 2；
4. with pore volume and the permeability of oil field aquametry rock core 57；
5. again with the flow velocity injection of polymer solution a2 of 20mL/min；
6. sample after injecting 10PV, obtain polymer solution a3,1000mL is standby for sampling；
7. in 65 DEG C of temperature, shear rate 7.34s-1Under conditions of determine rock core shearing after apparent viscosity；Apparent viscosity
Retention rate is calculated by formula (3).
According to above-mentioned experimental procedure, concentration is determined respectively and is respectively 1250mg/L, 1500mg/L, 1750mg/L, 2000mg/
L, 2250mg/L polymer solution a0 to be measured, and obtain corresponding polymer solution a1, polymer solution a2, polymer solution a3
Sampling is standby.
The viscosity of polymer solution a1, polymer solution a2, polymer solution a3 is determined using Brookfield viscometers,
Polymer solution a1, polymer solution a2, the agglomerate size of polymer solution a3, employing scanning electricity are determined using light scattering apparatuss
Mirror, atomic force microscope determine polymer solution a1, polymer solution a2, the microstructure of polymer solution a3, using rheology
Instrument determines polymer solution a1, polymer solution a2, the rheological property of polymer solution a3, determines polymer using displacement test
Solution a1, polymer solution a2, the resistance coefficient of polymer solution a3, residual resistance factor and oil displacement efficiency.Due to polymer
The viscosity of solution, agglomerate size, microstructure, rheological property can be directly measured using corresponding measuring instrument, and here is just
Concrete measurement process is not repeated.
Displacement test process is detailed below：
1st, the measure of polymer solution resistance coefficient and residual resistance factor：
(1) quartz sand of 80 mesh～100 mesh is separated out with vibrosieve, by the quartz sand washes clean screened and is dried；
The quartz sand of drying is filled in into the fill out sand tube 84 uniform compaction of Φ 2.5cm × 25cm, be fabricated to permeability it is close, homogenizing
One-dimensional fill out sand tube 84 (permeability retention is at 2 μm2Left and right)；Filled quartz sand fill out sand tube 84 is claimed to do with electronic balance
Weight；
(2) displacement test analog 1 is connected according to Fig. 4, wherein 80 is electric heating air blast cyclic drying constant temperature oven, 81
For high speed and high pressure pump, 82 is pressure acquisition system, and 83 is pressure transducer, and 84 is fill out sand tube, and 85 is liquid collecting container, and 86 is oil field
Water container, 87 is polymer solution reservoir, and 88 is crude oil container, and 86,87,88 are referred to as intermediate receptacle, and 89 is valve；
(3) with the stainless (steel) wire that aperture is 25 μm of 0.45 μm of filter membrane and aperture respectively to oil field water and different modes shearing after
Polymer solution, the water after filtration and the polymer solution after cutting are respectively charged in corresponding intermediate receptacle 86,87,88；
(4) with the injection rate of 1mL/min to 84 saturated oils water in field of fill out sand tube, pressure to be implanted steadily continues injection one afterwards
The section time；Suspend experiment, remove fill out sand tube 84 and weigh weight in wet base, by the pore-body to try to achieve fill out sand tube 84 of poor quality in front and back
Product, calculates its permeability by the pressure value that measures；
(5) conversion valve 89, with injection rate as 0.3mL/min polymer waterfloodings, continue after pressure is injected steadily
Termination of pumping after injection about 5PV polymer solutions；Then carry out sequent water flooding, i.e., with injection rate as 0.3mL/min oiling water in field, and
Record entry end pressure, continues termination of pumping after injection about 5PV after sequent water flooding is stable；
(6) pressure curve and secondary injection oil field hydraulic pressure force curve of injection of polymer solution are drawn；According to formula (4) and
(5) resistance coefficient and residual resistance factor are calculated.
In formula：
FRResistance coefficient；
FRRResidual resistance factor；
QpInjection rate during polymer waterflooding, mL/min；
QwaInjection rate during water drive, mL/min；
QwbInjection rate during sequent water flooding, mL/min；
△PpPressure reduction when polymer waterflooding is stable, MPa；
△PwaPressure reduction when water drive is stable, MPa；
△PwbPressure reduction when sequent water flooding is stable after note poly polymer solution, MPa.
2nd, the measure of polymer solution oil displacement efficiency：
(1) model is filled and presented and water surveys permeability：
1. the quartz sand of 80 mesh～100 mesh is separated out with vibrosieve, by the quartz sand washes clean screened and is dried；Will
The quartz sand of drying is filled in the fill out sand tube 94 uniform compaction of Φ 3.8cm × 50cm, be fabricated to permeability it is close, homogenizing
(permeability retention is at 2 μm for one-dimensional fill out sand tube 942Left and right)；Claim dry weight by filled quartz sand fill out sand tube 94 with electronic balance；
2. it is electric heating air blast cyclic drying constant temperature oven to connect displacement test analog 2, wherein 90 according to Fig. 5, and 91 are
High speed and high pressure pump, 92 is pressure acquisition system, and 93 is pressure transducer, and 94 is fill out sand tube, and 95 is liquid collecting container (graduated cylinder), and 96 are
Oil field water container, 97 is polymer solution reservoir, and 96,97 are referred to as intermediate receptacle, and 98 is valve；
3. oil field water is injected in fill out sand tube 94 with the speed of 5mL/min, record injection pressure, after pressure is steady, is counted
Calculate permeability；Fill out sand tube 94 is removed, weight in wet base is weighed, the mass number value difference before and after fill out sand tube 94 is pore-body product value；
(2) saturation crude oil and aging：
1. as shown in figure 5, switching valve 98, the injection experimentses dewatered oil in fill out sand tube 94；In 94 tail end of fill out sand tube
Liquid is connect with liquid collecting container 95, for calculating oil saturation；First with speed saturation 12h of 0.2mL/min, then with 0.3mL/min
Speed saturation 6h, finally with speed saturation 4h of 0.4mL/min；After the completion of saturation, 94 injection end of fill out sand tube and tail end is closed,
Aging 3 days under experimental temperature；
(3) displacement of reservoir oil：
Fill out sand tube 94 after taking-up is aging, with the speed injection oil field water of 1mL/min, connects liquid in 94 tail end of fill out sand tube, often
10min changes a liquid collecting container 95, when moisture content reaches 95%, switches valve 98, is injected with the speed of 1mL/min
The polymer solution of 1750mg/L, injection rate are 0.3PV；Valve 98 is switched, then with the speed injection oil field water of 1mL/min, is treated
Moisture content stops experiment when reaching 95%；Calculate correlation performance parameters.Correlation performance parameters are shown in Table shown in 4, table 5：
Performance parameter table after 4 polymer solution a0 to be measured of table is clipped
Viscosity parameter table after 5 polymer solution a0 to be measured of table is clipped
Find out from table 4 and 5, after Wu Yin shearings, the fall of the viscosity of polymer solution is maximum, viscosity loss is the
Maximum is reached after one-level shearing.Again after near wellbore zone shearing experiment device and rock core, the viscosity decline of polymer solution
It is not a lot.Through the shear action of the first order, the retention rate of viscosity is respectively 7%, 7%, 10%, 11% and 22%.Again
After the shearing of near wellbore zone, viscosity further declines on the viscosity base after Wu Yin shearings, the retention rate point of viscosity
5.4%, 5.36%, 7.69%, 8.34% and 13.81% is not reduced to.The solution viscosity after rock core shearing is eventually passed two
On the basis of secondary shearing, another step is reduced, and the retention rate of viscosity is further reduced to 3.41%, 4.08%, 6.36%, 6.15%
With 7.53%.It can be seen that, in continuous shearing, most initial Wu Yin shearings are maximum to the viscosity influence of polymer solution.This is
Because after the shearing of the first order, the associative structure and molecular chain rupture of polymer solution substantially, cause table to polymer solution
See viscosity drastically to decline；When again passing by the shearing of the second level and the third level, the associative structure of polymer solution is simultaneously not apparent from extensive
Multiple, the strand of fracture is more, and shear action there is no longer large effect, thus apparent viscosity is maintained at relatively low level.It is viscous
Degree is lower, and polymer solution sets up resistance coefficient and the ability of residual resistance factor is lower, thus determined resistance system out
Number and residual resistance factor value are also low.
The experimental result drawn by the method with other prior arts Comparatively speaking, the experimental result more adjunction of the method
It is bordering on the actual parameter of Oil Field.Experimental technique described in this patent and Oil Field by the sampling in note collecting process and
The final sample for returning discharge from stratum carries out viscosity test and compares so as to the experimental result for drawing, it appears be more nearly.And
And this experiment can be according to used by the reservoir information (porosity, permeability, rock composition, particle diameter distribution etc.) at scene be come regulation experiment
Material, so as to more real simulated formation environment, the performance parameter of the polymer solution for measuring is more accurate, can be polymerization
The selection of thing solution and the judgement of reservoir oil displacement scheme provide more favourable basis for estimation.
It can be professional and technical personnel in the field's realization or use that above-mentioned embodiment is intended to illustrate the present invention, to above-mentioned
Embodiment is modified, therefore the present invention is included but is not limited to
Above-mentioned embodiment, it is any to meet the claims or description description, meet with principles disclosed herein and novelty,
The method of inventive features, technique, product, each fall within protection scope of the present invention.
Claims (7)
1. a kind of three-level cutting method for determining Polymer Used For Oil Displacement solution property parameter, comprises the steps：
1) polymer solution a0 to be measured is prepared, polymer solution a0 to be measured is that oil field water and polymer dry powder mix in any proportion
Solution；
2) first order shearing is carried out using WARING agitators to polymer solution a0 to be measured, obtains poly- Jing after first order shearing
Polymer solution a1, the viscosity of measure polymer solution a1, agglomerate size, microstructure, rheological property, resistance coefficient, remnants
Resistance coefficient, oil displacement efficiency；
3) second level shearing is carried out using near wellbore zone shearing simulation device to polymer solution a1, is obtained Jing after the shearing of the second level
Polymer solution a2, determine the viscosity of polymer solution a2, agglomerate size, microstructure, rheological property, resistance coefficient,
Residual resistance factor, oil displacement efficiency；
4) third level shearing is carried out using rock core shearing simulation device to polymer solution a2, obtains poly- Jing after third level shearing
Polymer solution a3, the viscosity of measure polymer solution a3, agglomerate size, microstructure, rheological property, resistance coefficient, remnants
Resistance coefficient, oil displacement efficiency；
Step 4) in polymer solution a3 acquisition methods it is as follows：
1. the rock core equal with oil recovery field reservoir permeability is actually treated is chosen, is clamped on core holding unit, is installed on reality
In experiment device；
2. the valve at oil field water container two ends is opened, the valve at polymer solution reservoir two ends is closed, pump is opened, is not more than
The speed of 1mL/min injects oil field water to there are flowing out to the rock core in core holding unit；
3. the valve at oil field water container two ends is closed, the valve at polymer solution reservoir two ends is opened, polymer solution a2 is noted
Enter in the rock core in core holding unit, depending on the injection flow velocity of polymer solution a2 is according to the injection index of Oil Field, then change
The injection flow velocity for pump is calculated, it is the polymer solution a3 Jing after third level shearing to receive after at least 10PV by the solution of rock core；
The experimental provision includes the oil field water container of parallel connection and polymer solution reservoir, the oil field water container and the polymerization
Thing solution container co-portal end connects a container by pump, and the oil field water container and the polymer solution reservoir go out jointly
Mouth end is connected with shearing simulation device, and the shearing simulation device is near wellbore zone shearing simulation device or rock core shearing simulation
Device, is provided with pressure between the oil field water container and the polymer solution reservoir conjoint outlet end and the shearing simulation device
Force transducer, pressure transducer are connected with pressure acquisition system, and the shearing simulation device outfan is provided with a sampler barrel, described
Oil field water container and the polymer solution reservoir are respectively arranged at the two ends with a valve.
2. the three-level cutting method for determining Polymer Used For Oil Displacement solution property parameter according to claim 1, which is special
Levy and be, step 1) in prepare aqueous solutions of polymers to be measured and comprise the steps：
1. measure oil field water；
2. weigh polymer dry powder；
3. stirring oil field water makes to form whirlpool, and polymer dry powder is added within 30s oil apart from whirlpool center 2/3～3/4
In water in field, persistently stir, all dissolving stops stirring making polymer, obtains polymer solution a0 to be measured.
3. the three-level cutting method for determining Polymer Used For Oil Displacement solution property parameter according to claim 1, which is special
Levy and be, the step 2) in polymer solution a1 acquisition methods it is as follows：Pour polymer solution a0 to be measured into WARING to stir
Mix in device to pour out after the rotating speed stirring 5s～25s of I grade of 3500r/min or II grade of 7000r/min, obtain Jing after its natural froth breaking
Polymer solution a1 after first order shearing；Wherein, WARING agitator speeds together decide on shear strength with mixing time, cut
Shearing stress is equal to the corresponding stratum shear strength of Oil Field.
4. the three-level shearing side for determining Polymer Used For Oil Displacement solution property parameter according to claim 1 or 2 or 3
Method, it is characterised in that the step 3) in polymer solution a2 cut by the experimental provision of near wellbore zone shearing simulation device
Obtain after cutting.
5. the three-level cutting method for determining Polymer Used For Oil Displacement solution property parameter according to claim 4, which is special
Levy and be, step 3) in fill and present near wellbore zone shearing simulation device and comprise the steps：
1. preforation tunnel is filled and presented, is filled and presented using 40 mesh～60 mesh quartz sands, tap and be urged to porosity near equal to Oil Field
The porosity on the corresponding stratum in well area, preforation tunnel is screwed firmly；
2. gravel packing zone is filled and presented, is filled and presented using 40 mesh～60 mesh quartz sands, make porosity be equal to Oil Field near wellbore zone phase
Answer the porosity on stratum；
3. wire-wrapped screen is installed, the device inversion for completing will be filled and presented, and be filled and presented compaction band and near wellbore zone stratum successively；Fill and present compacting
Band adopts quartz sand mesh number for 100 mesh～120 mesh, makes porosity be equal to the porosity on the corresponding stratum in Oil Field near wellbore zone；
Near wellbore zone stratum is filled and presented using 40 mesh～80 mesh, 80 mesh～120 mesh quartz sands according to Oil Field near wellbore formation equivalent layer
The ratio mixing of two kinds of quartz sands is filled and presented, and makes porosity be equal to the porosity on the corresponding stratum in Oil Field near wellbore zone.
6. the three-level cutting method for determining Polymer Used For Oil Displacement solution property parameter according to claim 5, which is special
Levy and be, step 3) in polymer solution a2 acquisition methods it is as follows：
1. installation fills and presents the near wellbore zone shearing simulation device for completing in the experimental provision；
2. polymer solution reservoir two ends valve is closed, oil field water container two ends valve is opened, pump is opened, to be not more than 10mL/
The flow velocity of min injects near wellbore zone shearing simulation device to there are flowing out；
3. oil field water container two ends valve is closed, polymer solution reservoir two ends valve is opened, will be polymer solution a1 injections near
In the shearing simulation device of well area, depending on the injection flow velocity of polymer solution a1 is according to the injection index of Oil Field, then convert
For the injection flow velocity of pump, it is Jing after the shearing of the second level to receive after at least 10PV by the solution of near wellbore zone shearing simulation device
Polymer solution a2.
7. the three-level cutting method for determining Polymer Used For Oil Displacement solution property parameter according to claim 1, which is special
Levy and be, the polymer solution a1, polymer solution a2, the viscosity of polymer solution a3 are determined by viscometer, described poly-
Polymer solution a1, polymer solution a2, the agglomerate size of polymer solution a3 are determined by light scattering apparatuss, and the polymer is molten
Liquid a1, polymer solution a2, the microstructure of polymer solution a3 are by scanning electron microscope, atomic force microscope observation, described poly-
Polymer solution a1, polymer solution a2, the rheological property of polymer solution a3 are by rheometer test, the polymer solution
A1, polymer solution a2, the resistance coefficient of polymer solution a3, residual resistance factor and oil displacement efficiency are surveyed by displacement test
It is fixed.
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| CN106404634B (en) * | 2016-11-29 | 2018-09-21 | 中国海洋石油集团有限公司 | A method of evaluation polymer solution reduces oilfield reservoir permeability |
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| CN107503721B (en) * | 2017-08-18 | 2019-08-02 | 西南石油大学 | A method of being effectively improved hypertonic high water-cut reservoir polymer flooding effect |
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