CN108303348A - Polymer stretches degradation characteristic simulator and system in pore throat in reservoirs - Google Patents
Polymer stretches degradation characteristic simulator and system in pore throat in reservoirs Download PDFInfo
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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Abstract
The invention belongs to oil-gas mining technical fields, and in particular to degradation characteristic simulator and system be stretched in pore throat in reservoirs to polymer, which is made of the pore throat model with different throat lengths, and single pore throat model includes throat portion and aperture sections；The system includes injected system, pore throat model and extraction polymer test system；The device and system comprising the device solve the problems, such as that existing polymer stretches degradation evaluating apparatus and can not accurately quantify polymer in pore throat in reservoirs and stretch degradation characteristic, eliminate polymer occur in pore media shear degradation, absorption, machinery trapping etc. multifactor functionings influence, can accurate quantification polymer degradation characteristic is stretched in pore throat in reservoirs.
Description
Technical field
The invention belongs to oil-gas mining technical fields, and in particular to degradation characteristic mould is stretched in pore throat in reservoirs to polymer
Quasi- apparatus and system.
Background technology
In oil-gas field development field, especially polymer flooding improves oil recovery direction, polymer and containing polymer
When chemical agent flows in oil reservoir, it is usually associated with the influence of mechanical degradation and delay.Wherein mechanical degradation includes shear degradation
It degrades with stretching, delay is divided into Adsorption And Retention, machinery trapping, hydrodynamic retention.Stretch degradation be polymer or contain polymer
One of chemical agent an important factor for its rheological characteristic is influenced by pore throat in reservoirs.Study Polymer Melts and the chemistry containing polymer at present
The simulator that agent stretches degradation characteristic in pore throat in reservoirs mainly has following three kinds：
(1) rock core simulator：The device is the displacement test artificial core of routine, which is to retain
The pore structure characteristic of reservoir rock itself, rock surface physical property and cement, closer to true porous media.
Since pore structure is more complex, on the one hand, it is poor that rock core simulator itself makes repeatability.On the other hand, in rock core
When carrying out seepage simulation test in model equipment, polymer not only occurs to stretch degradation, also shear degradation, delay (absorption, machine
Tool trapping, hydrodynamic retention) etc., so Seepage Experiment of the polymer in rock core simulator can only generally reflect polymer
Rheological characteristic rule, and can not individually evaluate stretching degradation characteristic of the polymer in rock core simulator.
(2) back-up sand simulator：The device is similar to rock core simulator, back-up sand simulator due to being manual back-up sand,
So making of back-up sand simulator itself is repeatable poor.Although carrying out seepage simulation test in sandpack column device
When, the delay of polymer is fewer, but the problem of multifactor functionings such as stretching degradation, shear degradation still remains, still
The old stretching degradation characteristic that can not individually evaluate polymer in back-up sand simulator.
(3) glass etching model equipment：The model equipment is made of two sheet glass.Using following production method：Wherein
After the runner or pore network of certain reservoir pore structure are provided in one sheet glass etching solution or laser-induced thermal etching, then with separately
One sheet glass is cementing to be made.It is molten that the advantages of model equipment, can exclude the polymer caused by polymer machinery traps
The viscosity loss of liquid, and some simple pore channels can be made, shearing and drawing of the replica polymerization object in pore throat in reservoirs
Stretch degradation characteristic.But on the one hand the moulded dimension is smaller, not pressure-resistant, the flow and pressure that can allow for are smaller, it is difficult to
The stretching degradation characteristic of simulation and evaluation polymer under the high-speed stretch rate conditions of near wellbore zone；On the other hand, the model
It can not be distinguished shearing and stretching degradation characteristic.
The rheological characteristic that polymer or oil displacement agent containing polymer reach oil deposit deep part is the key that determine its oil displacement efficiency,
And stretching degradation characteristic of the polymer in pore throat in reservoirs is one of the key factor for influencing its rheological characteristic, therefore, polymer exists
Stretching degradation characteristic in pore throat in reservoirs has great importance to improving recovery ratio.Therefore, foundation can be commented truely and accurately
It is very necessary that valence polymer stretches the simulator of degradation characteristic and system in pore throat in reservoirs.
Existing simulator (such as rock core simulator and back-up sand simulator) is difficult to eliminate polymer in pore media
It is middle that the influence of the multifactor functionings such as shear degradation, absorption, machinery trapping occurs, and pore throat in reservoirs cannot be taken into account simultaneously
Under the conditions of polymer stretch degradation condition and stretch degradation characteristic quantization.Evaluation polymer stretches degradation in pore throat in reservoirs
Characteristic it is critical that the influence of multifactor functioning can be excluded by establishing, while realizing simulation and accurate quantification polymer
The apparatus and system of degradation characteristic is stretched in pore throat in reservoirs.
Invention content
One of the object of the invention is to provide polymer in order to solve the shortcomings of the prior art and drawn in pore throat in reservoirs
Stretch degradation characteristic simulator, there is provided a kind of polymer that degradation characteristic simulation system is stretched in pore throat in reservoirs for the second purpose
System.
An object of the present invention can be achieved through the following technical solutions：
Polymer stretches degradation characteristic simulator in pore throat in reservoirs,
The device is made of one group of pore throat model；
Single pore throat model includes venturi position and hole position；
The venturi position include quartz capillary, male thread connector with for bonding quartz capillary and male thread connects
The glued layer of head；
The hole position includes the box thread connector equipped with polymer Injection Space and pore structure；
The venturi position and hole position is threadedly coupled by male thread connector and box thread connector, makes polymerization
Object Injection Space, pore structure and quartz capillary are sequentially communicated.
An object of the present invention can also be achieved through the following technical solutions：
The polymer stretches degradation characteristic simulator in pore throat in reservoirs, and the pore throat model has different venturis
Length.
The quartz capillary surface is coated with polyimide coating.
The second object of the present invention can be achieved through the following technical solutions：
The polymer stretches degradation characteristic simulation system in pore throat in reservoirs, the system include injected system, pore throat model,
It produces polymer and tests system；The pore throat model is that polymer described above stretches degradation characteristic mould in pore throat in reservoirs
Quasi- device.
The second object of the present invention can also be achieved through the following technical solutions：
The injected system that the polymer stretches described in degradation characteristic simulation system in pore throat in reservoirs includes：
Constant speed and constant pressure pumps；
Piston container：Pass through the piping connection equipped with two-port valve with the constant speed and constant pressure pump；
Pressure acquisition system：It is located at the piston tank outlet pipe road；Wherein, piston tank outlet pipe road is close living
The one end for filling in container is equipped with two-port valve, and pressure acquisition system is located at far from piston one end；The pressure acquisition system packet
Include pressure sensor and pressure display unit.
The polymer stretches degradation characteristic simulation system in pore throat in reservoirs, and simulation steps include：
(1) two-port valve on pipeline is opened, is pumped using constant speed and constant pressure and the polymer in piston container is pumped into pore throat model
After pressure acquisition system detects that loine pressure is stablized, degradation is collected using extraction polymer test system for mechanical degradation system
Polymer afterwards, and its apparent viscosity is tested, calculate polymer viscosity loss late；
(2) replace the pore throat model of different throat lengths, then repeatedly step (1), obtain polymer viscosity loss late with
The relation curve of throat length variation；
(3) curve is subjected to the outer polymer viscosity loss late being extended down to when throat length is zero, as degraded due to stretching
And the viscosity loss velocity generated.
Constant speed and constant pressure pump is used as power source, and polymer is pumped into polymerization by pipeline by piston container with certain flow velocity
Object stretches in pore throat in reservoirs in degradation characteristic simulator, and pressure acquisition system acquires polymer in mould by pressure sensor
The pressure at quasi- device portal end, and the polymer after stretching degradation is collected by extraction polymer test system, and use rheology
Instrument measures the sample apparent viscosity after stretching degradation.
Mechanical degradation of the polymer in single pore throat model, by the shear degradation in the stretching degradation of pore throat and venturi
Two parts form；The throat diameter or pore-throat ratio of pore throat model influence the stretching degradation and shear degradation of polymer simultaneously, wherein
The throat length of pore throat model only has an impact the shear degradation in venturi, and has no effect on the degradation of the stretching at pore throat.Cause
And the stretching degradation characteristic for Study Polymer Melts at pore throat, can not directly using throat length be zero pore throat model into
Row analog study, but a series of pore throat models of different throat lengths is used to carry out analog study.
The present invention uses the pore throat model with different throat lengths to carry out simulation test, and polymer is made to occur to stretch drop
Solution, it is described to test the polymer after system collects degradation by producing polymer, and flowed through by rheometer test polymer
Apparent viscosity (the shear rate 7.34s of the pore throat model of different throat lengths-1), polymer viscosity loss late is calculated, is drawn poly-
The relation curve that object viscosity loss velocity changes with throat length is closed, curve is subjected to the outer polymer being extended down to when throat length is zero
Viscosity loss velocity, the viscosity loss velocity as generated due to stretching degradation.
Description of the drawings
Fig. 1 shows polymer described in embodiment 1, and degradation characteristic simulator is stretched in pore throat in reservoirs；
Wherein, 1 is quartz capillary；2 be glued layer；3 be male thread connector；4 be pore structure；5 be box thread connector；
6 be polymer Injection Space；
Fig. 2 indicates that the polymer described in embodiment 2 stretches degradation characteristic simulation system in pore throat in reservoirs；
Wherein, it 7 is pumped for constant speed and constant pressure；8,10 be two-port valve；9 be piston container；11 be pressure sensor；12 is aobvious for pressure
Show device；13 be pore throat model；14 test system for extraction polymer；
Fig. 3 indicates that polymer flows through regarding for the stretching degradation characteristic simulator of different throat lengths with different stretch rate
Viscosity；
Fig. 4 indicates that polymer flows through the viscous of the stretching degradation characteristic simulator of different throat lengths with different stretch rate
Spend loss late；
Fig. 5 indicates that polymer stretches degradation viscosity loss velocity with rate of extension change curve.
Specific implementation mode
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work according to the present invention, belongs to this hair
The range of bright protection.
1 polymer of embodiment stretches degradation characteristic simulator in pore throat in reservoirs
The device by one group there are different throat length pore throat models to constitute；
Wherein, single pore throat model is as shown in Figure 1, pore throat model includes venturi position and hole position；
The venturi position includes quartz capillary (1), male thread connector (3) and is used to bond quartz capillary and public affairs
The glued layer (2) of nipple；
The hole position includes the box thread connector (5) equipped with polymer Injection Space (6) and pore structure (4)；
The venturi position and hole position is threadedly coupled by male thread connector (3) and box thread connector (5),
Polymer Injection Space (6), pore structure (4) and quartz capillary (1) is set to be sequentially communicated；
The polymer Injection Space diameter is more than pore diameter, and pore diameter is more than quartz capillary internal diameter；
Wherein, the quartz capillary surface is coated with polyimide coating；The glued layer (2) is industrial all-purpose adhesive
(I types close many 504 super all-purpose adhesives)；Male thread connector and box thread connector are standard component, which can pressure resistance 30MPa.It is real
It applies 2 polymer of example and stretches degradation characteristic simulation system in pore throat in reservoirs
The system connection type including injected system, pore throat model (13), extraction polymer as shown in Fig. 2, test system
(14)；
The injected system includes：Constant speed and constant pressure pumps (7)；
Piston container (9)：With the described constant speed and constant pressure pump (7) by being equipped with the piping connections of two-port valve (8)；
Pressure acquisition system：It is located on described piston container (9) export pipeline；Wherein, piston container (9) export pipeline
One end of upper nearly piston container is equipped with two-port valve (10), pressure acquisition system be located at far from piston one end and with pore throat mould
Type (13) is connected；The pressure acquisition system includes pressure sensor (11) and pressure display unit (12)；
The extraction polymer test system (14) includes sample collector and rheometer in the prior art；
The pore throat model (13) is that polymer described in embodiment 1 stretches degradation characteristic simulation dress in pore throat in reservoirs
It sets；Wherein, pore throat model (13) includes 4, and the material of used quartz capillary is vitreous silica, and internal diameter is 100 μm, outside
Diameter is 360-362 μm, 18-20 μm of outside coating polyimide coating thickness, coating ensure that quartz capillary flexibility and
Intensity (689.5MPa)；Other specifications difference is as shown in table 1, and wherein throat length is quartz capillary length, throat diameter
As quartz capillary diameter：
The specifications parameter of 1 pore throat model of table
3 simulated experiment of embodiment
Degradation characteristic simulation system is stretched in pore throat in reservoirs carry out simulated experiment using polymer
Simulation steps include：
(1) two-port valve on pipeline is opened, is pumped using constant speed and constant pressure and the polymer in piston container is pumped into pore throat model,
After pressure acquisition system detects that loine pressure is stablized, the polymer after degradation is collected using extraction polymer test system, and
Its apparent viscosity is tested, polymer viscosity loss late is calculated；
(2) replace the pore throat model of different throat lengths, then repeatedly step (1), obtain polymer viscosity loss late with
The relation curve of throat length variation；
(3) curve is subjected to the outer polymer viscosity loss late being extended down to when throat length is zero, as degraded due to stretching
And the viscosity loss velocity generated.
The pump housing volume 229.18mL, the minimum flow rate 0.01mL/min of constant speed and constant pressure pump used in the embodiment, most
High pressure 20MPa.The range of pressure sensor：0-20MPa, class of accuracy：0.2 grade.Rheometer is HAKKE RS6000 types
Rotational rheometer, C60/1 ° of Ti L cone-plate measurement pattern, it is 7.34s that viscosity, which takes shear rate,-1Corresponding viscosity；Polymer type
For conventional H J (poly- Propionamides polymer), intrinsic viscosity 2510cm3/ g, a concentration of 2200mg/L, salinity are
32868mg/L, apparent viscosity (shear rate 7.34s-1) it is 30.57mPas, empirical flow：0.05-10mL/min；Calculating process
As follows
Polymer stretch the elongational flow in degrading simulator can approximation regard as and be uniaxially stretched flowing.By dividing
Analysis is not stretched with constant rate of extension it is found that during fluid is stretched.For this purpose, defining polymer flow through hole
The ratio of average speed difference and 1/2 pore length when laryngophantom is rate of extension.Rate of extension calculation formula (1) is as follows, according to
The rate of extension that this is calculated is as shown in table 2 below.
In formula (1),For rate of extension, 1/s；voFor venturi flow rate, m/s；viFor flow of pore rate, m/s；L is
The half of pore length, m.
2 polymer experiments flow of table and rate of extension
According to the apparent viscosity measurement result of Haake torque rheometer, draws polymer and different length drawing is flowed through with different stretch rate
Degradation simulator is stretched, it is as shown in Figure 3 that the apparent viscosity curve stretched after degrading occurs.
Fig. 3 clearly illustrates the stretching degradation characteristic simulation that polymer flows through different throat lengths with different stretch rate
Apparent viscosity after system.
Polymer flow occurs mechanical degradation (comprising degradation and shear degradation is stretched), causes to polymerize through single pore throat in reservoirs
Object apparent viscosity decline, for quantify polymer viscosity fall, define polymer occur mechanical degradation before and after apparent viscosity difference with
The ratio of original viscosity is viscosity loss velocity.Viscosity loss velocity calculation formula (2) is as follows, and the polymer being calculated accordingly is not with
The viscosity loss velocity of the stretching degradation characteristic simulator of different throat lengths is flowed through with rate of extension, and draws curve such as Fig. 4
It is shown.
In formula (2), η is viscosity loss velocity, %；μiFor initial apparent viscosity (shear rate 7.34s-1), mPas；μdFor
Stretch the apparent viscosity after degradation, mPas.
The single mechanical degradation in pore throat model of polymer, by the shear degradation in the stretching degradation of pore throat and venturi
Two parts form, and the throat diameter or pore-throat ratio of pore throat model influence the stretching degradation and shear degradation of polymer, pore throat simultaneously
The throat length of model only has an impact the shear degradation in venturi, and has no effect on the degradation of the stretching at pore throat.In order to grind
Study carefully stretching degradation characteristic of the polymer at pore throat, the pore throat model that can not the use of throat length is directly zero carries out simulation and grinds
Study carefully, but a series of pore throat models of different throat lengths is used to carry out analog study, it is finally that polymer is long in different venturis
It is zero that viscosity loss velocity curve under the conditions of degree is extended down to throat length outside respectively, viscosity loss velocity at this time, as due to stretching
The viscosity loss velocity of degradation and generation is defined as stretching degradation viscosity loss velocity.
Accordingly, the stretching degradation viscosity loss velocity of polymer is drawn out with the change curve of rate of extension, as shown in Figure 5.
As shown in Figure 5, polymer stretches degradation characteristic in pore throat in reservoirs：With the increase of rate of extension, degradation viscosity loss is stretched
Rate rises in power law rule.
In conclusion being remained unchanged to a series of throat diameter of pore throat models involved in the embodiment of the present invention, actually
By changing throat diameter (i.e. the internal diameter of quartz capillary) in pore throat model, it can evaluate in the pore throat in reservoirs of different scale and gather
The stretching degradation characteristic for closing object is bonded the all-purpose adhesive type of quartz capillary by change, can also simulate different pressures displacement
Under the conditions of polymer stretching degradation characteristic.Compared with the prior art, the embodiment of the present invention can really and accurately quantitatively evaluating
The stretching degradation characteristic of polymer in pore throat in reservoirs.
Claims (6)
1. polymer stretches degradation characteristic simulator in pore throat in reservoirs, which is characterized in that
The device is made of one group of pore throat model；
Single pore throat model includes venturi position and hole position；
The venturi position includes quartz capillary, male thread connector and is used to bond quartz capillary and male thread connector
Glued layer；
The hole position includes the box thread connector equipped with polymer Injection Space and pore structure；
The venturi position and hole position is threadedly coupled by male thread connector and box thread connector, and polymer is made to note
Enter space, pore structure and quartz capillary to be sequentially communicated.
2. polymer according to claim 1 stretches degradation characteristic simulator in pore throat in reservoirs, which is characterized in that institute
The pore throat model stated has different throat lengths.
3. polymer according to claim 1 stretches degradation characteristic simulator in pore throat in reservoirs, which is characterized in that institute
The quartz capillary surface coating polyimide coating stated.
4. a kind of polymer stretches degradation characteristic simulation system in pore throat in reservoirs, which is characterized in that the system includes that injection is
System, pore throat model, extraction polymer test system；The pore throat model is claim 1-3 any one of them polymer
Degradation characteristic simulator is stretched in pore throat in reservoirs.
5. polymer according to claim 4 stretches degradation characteristic simulation system in pore throat in reservoirs, which is characterized in that institute
The injected system stated includes：
Constant speed and constant pressure pumps；
Piston container：Pass through the piping connection equipped with two-port valve with the constant speed and constant pressure pump；
Pressure acquisition system：It is located at the piston tank outlet pipe road；Wherein, the nearly piston in piston tank outlet pipe road holds
One end of device is equipped with two-port valve, and pressure acquisition system is located at far from piston one end；The pressure acquisition system includes pressure
Force snesor and pressure display unit.
6. polymer according to claim 5 stretches degradation characteristic simulation system in pore throat in reservoirs, which is characterized in that mould
Quasi- step includes：
（1）The two-port valve on pipeline is opened, is pumped using constant speed and constant pressure and the polymer in piston container is pumped into pore throat model, pressure
After acquisition system detects that loine pressure is stablized, the polymer after degradation is collected using extraction polymer test system, and test
Its apparent viscosity calculates polymer viscosity loss late；
（2）The pore throat model of different throat lengths is replaced, then repeatedly step（1）, polymer viscosity loss late is obtained with venturi
The relation curve of length variation；
（3）Curve is subjected to the outer polymer viscosity loss late being extended down to when throat length is zero, is as produced due to stretching degradation
Raw viscosity loss velocity.
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| CN201711389470.1A CN108303348B (en) | 2017-12-20 | 2017-12-20 | Device and system for simulating tensile degradation characteristics of polymer in oil reservoir pore throat |
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| CN201711389470.1A CN108303348B (en) | 2017-12-20 | 2017-12-20 | Device and system for simulating tensile degradation characteristics of polymer in oil reservoir pore throat |
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| CN113775321A (en) * | 2020-05-21 | 2021-12-10 | 中国石油天然气股份有限公司 | Determination device for shear viscosity loss of polymer solution or chemical flooding system thereof and application |
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