CN104949899B - A kind of assay method of Polymer Used For Oil Displacement effective viscosity in porous media - Google Patents
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Abstract
The invention discloses a kind of assay method of Polymer Used For Oil Displacement effective viscosity in porous media, it is characterised in that comprises the steps of：A prepares Polymer Used For Oil Displacement solution；B returns the consistency coefficient H and flow stance index n for drawing polymer solution by shear stress and the relation curve of shear rate；C loads sand-filling tube model, determines the permeability k and porosity of sand-filling tube modelD polymer solution displacement fill out sand tube；E sequent water floodings：Determine the water after poly- drive and survey permeability kfAnd residual resistance factor FRR；F corrects Blake kozeny equations, and the calculation formula for finally giving effective viscosity is formula (5) or formula (6)：OrWater after consistency coefficient H, flow stance index n, permeability k, poly- drive is surveyed permeability k by gf, porosityOr residual resistance factor FRRSubstitute into above formula and calculate effective viscosity.
Description
Technical field
The invention belongs to Polymer Used For Oil Displacement viscosimetric analysis technical field in tertiary oil production in oil field, specifically, it is related to one
Plant the measure and calculation method of Polymer Used For Oil Displacement effective viscosity in porous media.
Background technology
Current polymer flooding has become a kind of important means of Old Eastern oilfield stimulation stable yields, used in polymer flooding
Displacing agent the overwhelming majority be acrylamide copolymer, for example partial hydrolysis type polyacrylamide, cationic-type polyacrylamide, dredge
Water association type polyacrylamide etc..It is generally believed that the dominant mechanism of polymer displacement of reservoir oil is reduction aqueous phase mobility, improve the oily mobility of water
Than, and then sweep efficiency is improved, reach the purpose for improving recovery ratio.The reduction of aqueous phase mobility generally has two approach：Increase water
(Zhang Peng, Wang Yefei open strong etc., several shadows of hydrophobic association polyacrylamide oil-displacement capacity for phase viscosity and reduction water phase permeability
The factor of sound, oilfield chemistry, 4 phases page 462~468 of volume 72 in 2010).Therefore the viscosity of polymer solution is to weigh displacing agent performance
One of an important index.Need it is noted that the aqueous viscosity said here not apparent viscosity, but polymer
Effective viscosity of the solution in pore media during seepage flow, it is viscous in porous media that this viscosity not only contains polymer solution
Sexual factor, further comprises elastic reaction.Therefore, the effective viscosity of polymer more really reflects polymer in pore media
Viscosity during middle flowing, design for mining site scheme and implements more to have reference value that (Cheng Jiecheng, BP16 solution are in porous media
In flow behavior, grand celebration petroleum geology with exploitation, 2 phases page 47~52 of volume 8 in 1989).
At present, the calculation formula of effective viscosity mainly has two kinds, and formula (7) is one of which, μefFor effective viscosity；Δ P is
Polymer solution displacement pressure difference；L is back-up sand length of tube；vDFor the percolation flow velocity of polymer solution；KfPass through for polymer solution rear
Water rinses permeability.
Using formula (7) calculate effective viscosity take into account delay of the polymer in porous media to the works of viscosity plays
With, but the non-newtonian flow volume property of polymer solution is not embodied in the formula.
Another calculation formula for calculating effective viscosity is Blake-kozeny equations, sees formula (8), in this formula, H
For consistency coefficient, n flow stance indexes, k and φ are respectively the permeability and porosity of rock.This computational methods although it is contemplated that
The non-newtonian flow volume property of polymer, but delay of the polymer in hole is not accounted for permeability and the shadow of porosity
Ring.
In the calculating of effective viscosity, the non-Newtonian fluid mechanic property of polymer solution should be considered, also to be embodied
Go out influence of the polymer flow to permeability and porosity after pore media, the effective viscosity so calculated could more be sticked on
Nearly actual conditions.
The content of the invention
In order to solve the above technical problems, having it is an object of the invention to provide a kind of Polymer Used For Oil Displacement in porous media
The measure and calculation method of viscosity is imitated, polymer non-Newtonian fluid mechanic property and polymer is considered and is detained in pore media
Influence set up effective viscosity measure and calculation method.
A kind of measure and calculation for Polymer Used For Oil Displacement effective viscosity in porous media that the object of the invention is realized in
Method, it is characterised in that comprise the steps of：
A, Polymer Used For Oil Displacement solution preparation：The total salinity of water is injected according to Oil Field, distilled water and chlorine is used
Salt dissolving prepares simulated injection water, reuses simulated injection water dissolving Polymer Used For Oil Displacement and obtains Polymer Used For Oil Displacement solution；
B, measure consistency coefficient and flow stance index：Using the rheological curve of rheometer measurement polymer solution, sheared
The relation curve of stress and shear rate, returns out the consistency coefficient H and flow stance index n of polymer solution；
C, filling sand-filling tube model：Fill out sand tube is loaded using quartz sand, a diameter of 2.5cm of fill out sand tube determines back-up sand pipe die
The permeability k and porosity of typeAnd draw permeability k and porosityRelational expression formula (1), wherein r is pore radius, and τ is
Tortuosity：
D, polymer solution displacement fill out sand tube：The discharge capacity of constant flow pump is set as 0.23ml/min, injection of polymer solution is straight
It is steady to pressure；
E, sequent water flooding：The discharge capacity of constant flow pump is set as 0.23ml/min, simulated injection water is injected, the water after poly- drive is determined
Survey permeability kfAnd residual resistance factor FRR, it is assumed that pore radius r and tortuosity τ does not change after poly- drive, then can obtain
Go out and gather the porosity after drivingPermeability k is surveyed with water after poly- drivefRelation be formula (2)；Residual resistance factor FRR and permeability k
And water surveys permeability k after poly- drivefRelation be formula (3)：
F, calculating effective viscosity：
Update equation formula：Permeability and porosity is caused to reduce because polymer has delay property in pore media,
Therefore permeability k is surveyed using water after poly- drivefReplace the permeability k of pore media, use the porosity after poly- driveInstead of original
PorositySo, revised Blake-kozeny equations are formula (4)：
Formula (2), formula (3) are substituted into formula (4), the calculation formula for finally giving effective viscosity is formula (5) or formula (6)：
Or
Substitute into and calculate：Then water after consistency coefficient H, flow stance index n, permeability k, poly- drive is surveyed into permeability kf, porosity
Or residual resistance factor FRRSubstitution formula (5) or formula (6) result of calculation are effective viscosity.
In the preparation of above-mentioned steps a Polymer Used For Oil Displacement solution：The chlorate is by sodium chloride, calcium chloride, magnesium chloride group
Into.
In above-mentioned steps c filling sand-filling tube models：The granularity of the quartz sand is 80-100 mesh, and back-up sand length of tube is 30-
50cm。
Beneficial effect：
A kind of measure and calculation method of Polymer Used For Oil Displacement effective viscosity in porous media of the present invention, considers polymerization
Thing non-Newtonian fluid mechanic property and polymer are detained the reduction of caused permeability and porosity to having in pore media
The influence of viscosity is imitated, Polymer Used For Oil Displacement effective viscosity and calculating in pore media can not accurately be obtained by solving prior art
The problem of method.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is shear stress-rate profile of the polymer solution that mass fraction is 0.1% in the present invention；
Fig. 3 is shear stress-rate profile of the polymer solution that mass fraction is 0.2% in the present invention.
Embodiment
With reference to embodiment and accompanying drawing, the invention will be further described.
Embodiment
A kind of measure and calculation method of Polymer Used For Oil Displacement effective viscosity in porous media, as shown in Figure 1：
1st, the simulated injection water that total salinity is 8625mg/L (calcium ions and magnesium ions 602mg/L) is prepared using distilled water.
1097.71g sodium chloride, 68.13g calcium chloride, 297.28g Magnesium dichloride hexahydrate crystal are dissolved in 100mL distilled water successively.Use
Simulated injection water dissolve displacement of reservoir oil acrylamide copolymer, prepare mass fraction be respectively 0.1% and 0.2% polymer it is molten
Liquid.
2nd, using HAAKE MARS type III rheometer (rotors：PZ38 the rheological curve of polymer) is determined.Set and determine
Temperature is 80 DEG C, and shear rate is 0-800s-1, determine shear stress and shear rate change relation, 0.1% and 0.2% it is poly-
Shear stress-rate curve of polymer solution is shown in Fig. 2, Fig. 3 respectively.By curvilinear regression go out polymer solution consistency coefficient H and
Flow stance index n is shown in Table 1 respectively.
The consistency coefficient H and flow stance index n of polymer solution under the different quality containing of table 1
| The mass fraction of polymer solution | Consistency coefficient H | Flow stance index n |
| 0.1% | 0.2115 | 0.5150 |
| 0.2% | 0.3154 | 0.4794 |
3rd, using quartz sand 6 fill out sand tube of filling of 80-100 mesh, a diameter of 2.5cm of fill out sand tube, length is 30cm.Use
People's Republic of China's oil and gas industry standard (SY/T6576-2003) is used for the evaluation of polymer for improving oil recovery
Recommendation way in method determine sand-filling tube model permeability and porosity.The permeability and hole of six roots of sensation sand-filling tube model
Degree is shown in Table 2.
The permeability k and porosity of the sand-filling tube model of table 2
4th, use quality fraction is 0.1% and 0.2% 6 groups of sand-filling tube models of polymer solution displacement respectively.Experiment temperature
Spend for 80 DEG C, set the discharge capacity of constant flow pump as 0.23ml/min.Simulation is used after inlet pressure is steady, then with identical discharge capacity
Inject water drive and replace sand-filling tube model, record entry pressure when inlet pressure is no longer reduced is calculated after poly- drive by Darcy formula
Water surveys permeability kf, residual resistance factor F is calculated by formula (3)RR。
6th, water after consistency coefficient H, flow stance index n, permeability k, poly- drive is surveyed into permeability k respectivelyf, porosityOr it is remaining
Resistance coefficient FRRSubstitution formula (5) or formula (6) calculate effective viscosity, and what is obtained the results are shown in Table 3.
Or
The various data that table 3 is determined in testing
Claims (3)
1. the assay method of a kind of Polymer Used For Oil Displacement effective viscosity in porous media, it is characterised in that by following steps group
Into：
A, Polymer Used For Oil Displacement solution preparation：The total salinity of water is injected according to Oil Field, distilled water and chlorate is used
Simulated injection water is prepared, simulated injection water dissolving Polymer Used For Oil Displacement is reused and obtains Polymer Used For Oil Displacement solution；
B, measure consistency coefficient and flow stance index：Using the rheological curve of rheometer measurement polymer solution, shear stress is obtained
With the relation curve of shear rate, the consistency coefficient H and flow stance index n of polymer solution are returned out；
C, filling sand-filling tube model：Fill out sand tube is loaded using quartz sand, a diameter of 2.5cm of fill out sand tube determines sand-filling tube model
Permeability k and porosity
D, polymer solution displacement fill out sand tube：The discharge capacity of constant flow pump is set as 0.23ml/min, injection of polymer solution is until pressure
Power is steady；
E, sequent water flooding：The discharge capacity of constant flow pump is set as 0.23ml/min, simulated injection water is injected, the water after poly- drive is determined and surveys and ooze
Saturating rate kfAnd residual resistance factor FRR, the porosity after poly- drive is drawn by formula (2)Residual resistive system is drawn by formula (3)
Number FRR, formula (2) and formula (3) are as follows：
<mrow>
<msub>
<mi>F</mi>
<mrow>
<mi>R</mi>
<mi>R</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mi>k</mi>
<msub>
<mi>k</mi>
<mi>f</mi>
</msub>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
<mo>;</mo>
</mrow>
F, calculating effective viscosity：Water after consistency coefficient H, flow stance index n, permeability k, poly- drive is surveyed into permeability kf, porosityOr
Residual resistance factor FRRSubstitution formula (5) or formula (6) result of calculation are effective viscosity, and formula (5) or formula (6) are as follows：
Or
2. a kind of assay method of Polymer Used For Oil Displacement effective viscosity in porous media according to claim 1, it is special
Levy and be in the preparation of step a Polymer Used For Oil Displacement solution：The chlorate is made up of sodium chloride, calcium chloride, magnesium chloride.
3. a kind of assay method of Polymer Used For Oil Displacement effective viscosity in porous media according to claim 1, it is special
Levy and be in step c filling sand-filling tube models：The granularity of the quartz sand is 80-100 mesh, and back-up sand length of tube is 30-50cm.
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| CN107869338A (en) * | 2017-11-03 | 2018-04-03 | 中国石油化工股份有限公司 | Chemical flooding common heavy oil dynamic viscosity reduction evaluation method |
| CN110059438B (en) * | 2019-04-28 | 2022-10-11 | 东北石油大学 | Calculation method for residual oil film deformation of polymer-driven microchannel |
| CN110457857B (en) * | 2019-08-21 | 2022-11-15 | 中国海洋石油集团有限公司 | Method for predicting polymer flooding effect under different crude oil viscosity conditions |
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| CN115306370B (en) * | 2022-08-10 | 2023-11-24 | 重庆科技学院 | Experimental device and method for online monitoring of residual resistance coefficient of polymer |
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