CN106526096B - A kind of experimental method of chemical flooding oil field injection-production well blocking simulation and de-plugging evaluation - Google Patents
A kind of experimental method of chemical flooding oil field injection-production well blocking simulation and de-plugging evaluation Download PDFInfo
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Abstract
The present invention provides the experimental method of a kind of chemical flooding oil field injection-production well blocking simulation with de-plugging evaluation.Using quartz sand come simulation rock mineral, heavy component is simulated using viscous crude, polymer is simulated using plain polypropylene amide or subject oil field application polymer.The present invention can flexibly obtain different form tamper according to tamper component and ratio；Heavy component proposed by the present invention not only avoids with quartz sand hybrid mode with the viscous organic substance of height and mixes uneven problem, also overcomes heavy component or high viscous organic substance by sandpack column saturation mode and injects more difficult problem；The present invention can carry out the effect assessment that various ways de-plugging or synergy are recovered the oil, and then obtain the effect data between distinct methods plugging removal effect or synergy oil recovery data or each parameter of quantization comparison, provide reliable evaluation platform for oil field.
Description
Technical field
The invention belongs to oil field development experimental fields, and in particular to a kind of chemical flooding oil field injection-production well blocking simulation and de-plugging
The experimental method of evaluation.
Background technique
With the extension of oil field development time, either injection well or producing well, blockage problem be it is generally existing,
Injectivity index or production capacity index can all decreased significantly, even more various for the chemical flooding oil field blocking origin cause of formation, such as macromolecule
Oil displacement system, emulsion aggregation, heavy component deposition in oil, is drilled well pollution, particle migration, water quality and injection-production method and changes shale
The penetrating power for reducing injection-production well near wellbore zone can all be led to by becoming etc., different degrees of to restrict the normal of injection well and producing well
Operation, therefore, near wellbore zone permeability is restored on processing stratum just to be become improvement injection well operation quality in oilfield development process, mentions
High oil well output maintains one of high and stable yields and the important measures of raising recovery ratio.To block in view of the different blocking origin causes of formation
Feature be also it is diversified, chemical flooding oil field injection-production well tamper ingredient include polymer, rock forming mineral, inorganic scale
The heavy component etc. deposited in precipitating and oil product is identification blocking early to alleviate its influence to production, is needed to different spies
The tamper of sign is simulated and carries out the de-plugging evaluation experimental of different modes.
Summary of the invention
It can easy simulation organic plugging object and the different de-pluggings of development in view of the above-mentioned problems, the object of the present invention is to provide one kind
The experimental method of mode effect assessment.
Chemical flooding oil field injection-production well organic plugging object mainly includes rock forming mineral, the heavy component deposited in oil product and organic
Polymer substance it is one or more, therefore, using quartz sand come simulation rock mineral, heavy component is simulated using viscous crude,
Polymer is simulated using polyacrylamide or subject oil field application polymer.
Organic plugging object purpose is simulated to realize, the present invention takes following technical scheme:
1) quartz sand is pre-processed, that is, Modified Quartz Sand is obtained to quartz sand surface modification using silane coupling agent,
It is set to be changed to the wet interface of oil by water-wet；
2) viscous crude is mixed with the Modified Quartz Sand, stands aging at a temperature of target reservoir, obtains oil-sand；
3) oil-sand is mixed with highly viscous polyacrylamide or subject oil field application polymer solution, is tested
Required tamper sample.
Above-mentioned technical proposal, in step 1), the quartz sand can be the quartz sand of 40~80 mesh；
The silane coupling agent can be selected from following at least one: vinyl three ('beta '-methoxy ethyoxyl) silane, isobutyl group
Triethoxysilane, gamma-aminopropyl-triethoxy-silane, concretely vinyl three ('beta '-methoxy ethyoxyl) silane.
In step 2), the viscous crude can be the viscous crude of viscosity 5000-10000mPa.s at 50 DEG C, concretely glue at 50 DEG C
Spend the viscous crude of 8000mPa.s.
The mass ratio of the viscous crude and Modified Quartz Sand is 1:3~1:20, concretely 1:9.
The target reservoir temperature is 45-70 DEG C, concretely 65 DEG C.
The time for standing aging is 24-48h, concretely for 24 hours.
Above-mentioned steps 2) in, since the viscosity of viscous crude is big, can first by after viscous crude and a small amount of kerosene or toluene mixed diluting again
With the Modified Quartz Sand is full and uniform mixes, finally slough kerosene or toluene.
It can be extracted by Soxhlet extraction and the accurate oil content in oil-sand is measured.
The oil content of the oil-sand is 5%-25%, concretely 7.8% (i.e. 100g oil-sand contains viscous crude 7.8g).
Above-mentioned steps 3) in, the oil displacement system performance in its performance of polymer and injection process in tamper
It differs greatly, viscoplasticity is stronger, therefore selects highly viscous polyacrylamide or subject oil field application polymer solution to simulate
High visco-elastic material.
The highly viscous polyacrylamide solution concretely viscosity 10000mPa.s (40 DEG C) normal part hydrolysis
Polyacrylamide solution.
The operation that oil-sand is mixed with highly viscous polyacrylamide or subject oil field application polymer solution are as follows: will
Highly viscous polyacrylamide or subject oil field application polymer solution uniformly smear a small thin layer on plate, and oil-sand is spread on
On small thin layer, then topple over (oil-sand fallen can continue to be spread on unlapped small thin layer), finally shells the oil-sand particle of adherency
From, it stirs, it is uniformly mixed, aforesaid operations are repeated until height contained in oil-sand glues object solution content and reaches requirement.
When repetitive operation, the oil-sand spread is the oil-sand obtained in the previous step containing high viscous object, and the purpose of repetitive operation is to allow
The content of high viscous object increases in oil-sand.
Above-mentioned resulting tamper sample is the shape that polymer is wrapped in that heavy component wraps up rock forming mineral again
State can obtain heavy component package rock forming mineral, heavy component package polymer, organic polymer object according to demand
Matter package rock forming mineral, polymer package heavy component, heavy component are wrapped in polymer and wrap up again
The tamper form of rock forming mineral.
It is all belonged to the scope of protection of the present invention by the simulation tamper that the above method obtains.
The simulation tamper can be wrapped in heavy component for polymer and wrap up rock forming mineral, heavy component again
It wraps up rock forming mineral, heavy component package polymer, polymer and wraps up rock forming mineral, organic polymer
Substance package heavy component, heavy component are wrapped in the form that polymer wraps up rock forming mineral again.
After the tamper for obtaining different shape, to realize different de-plugging mode effect assessment purposes, the present invention takes following
Technical solution: using one-dimensional sandpack column, and one end is loaded with clean quartz sand, and the other end is loaded with simulation tamper obtained,
It is filled the water by clean quartz sand end constant speed, is stablized to pressure, record pressure and data on flows, experimental program is then pressed by tamper end
De-plugging system is injected, after closing is soaked for a period of time, valve is opened and continues to be filled the water by clean quartz sand end constant speed, it is steady to pressure
Fixed, experiment terminates, and records pressure data and calculates comparison front and back permeability.
The invention adopts the above technical scheme, which has the following advantages: 1, the present invention can according to tamper component with
Ratio flexibly obtains different form tamper.2, heavy component proposed by the present invention glues organic substance and the quartz sand side of mixing with height
Formula not only avoids the uneven problem of mixing, also overcomes heavy component or high viscous organic substance is infused by sandpack column saturation mode
Enter more difficult problem.3, the present invention can carry out the effect assessment that various ways de-plugging or synergy are recovered the oil, and then obtain distinct methods solution
Stifled effect or synergy oil recovery data or quantization compare the effect data between each parameter, and it is flat to provide reliable evaluation for oil field
Platform.
Detailed description of the invention
Fig. 1 is the work flow diagram of the embodiment of the present invention 2.
Specific embodiment
The present invention will be described below by way of specific embodiments, but the present invention is not limited thereto.
Experimental method used in following embodiments is conventional method unless otherwise specified；Institute in following embodiments
Reagent, material etc., are commercially available unless otherwise specified.
The simulation of embodiment 1, organic plugging object
The quartz sand for selecting 40~80 mesh first, using vinyl three ('beta '-methoxy ethyoxyl) silane of concentration 0.5%
Coupling agent aqueous solution stirs 45min at 90 DEG C and is modified to quartz sand surface, is changed to the wet interface of oil by water-wet；Then by viscosity
8000mPa.s viscous crude (50 DEG C) and dilution with toluene agent are by volume after 9:1 mixed diluting viscosity reduction, then take 50g flux oil and 450g
The full and uniform mixing of Modified Quartz Sand, 6h removes diluent in 70 DEG C of placement draught cupboards, then quiet at 65 DEG C of target reservoir temperature
After setting aging for 24 hours, weigh 5g oil-sand by Soxhlet extraction extraction obtain three times Average oil concentration 7.8% in quartz sand (error <
5%)；By viscosity 10000mPa.s (40 DEG C) normal part hydrolyzed polyacrylamide (molecular weight 20,000,000) solution (mass concentration
It 8000ppm) rises to 80 DEG C and is uniformly applied to a small thin layer on plate, weigh the above-mentioned oil-sand of 100g and be spread on small thin layer and then incline
, the oil-sand fallen can continue to be spread on unlapped small thin layer, and the oil-sand particle for being finally peeled away adherency carries out sufficiently at 90 DEG C
Be stirred, for obtain test needed for tamper sample, which is repeated twice, and calculates to obtain contained high viscous object in oil-sand by weight method
Solution content 19.2%.
Above-mentioned to be merely to illustrate the present embodiment, wherein each component ratio and tamper form can be become according to actual needs
Change.
Embodiment 2
As shown in Figure 1, filling and presenting one-dimensional sandpack column using clean quartz sand first, water filling carries out original permeability after the completion
Measurement, by the end A to the end B with 1mL/min constant speed water filling, to pressure stablize, calculate original permeability D1 be 234mD；Then will
Embodiment 1 is obtained to simulate tamper, loads 1/3 clean quartz sand of displacement from the end B, is continued by the end A to the end B permanent with 1mL/min
Speed water filling, stablizes to pressure, and permeability D2 is 136mD after calculating to block；By de-plugging agent, (main component is biological enzyme, quality
Content 1%) with tamper volume ratio 1:2 by the end B inject de-plugging system, impregnate 72h after, again by the end A to the end B 1mL/min
Constant speed water filling, stablizes to pressure, calculate after de-plugging permeability D3 be 216mD.Core permeability is only initial value after blocking
58.1%, after being acted on by de-plugging system, obvious to rock core permeability improvement, core permeability restores to initial after de-plugging
The 92.3% of value.
Above-mentioned to be merely to illustrate the present embodiment, the wherein clean quartz sand of tamper replaceable 100%, displacement ratio can be with
It is adjusted according to experimental program, in addition, the model, which is not limited only to permeability, restores experimental evaluation, it can also be used to calculate de-plugging synergy and adopt
Oily experimental evaluation.
Claims (8)
1. a kind of method for simulating organic plugging object, comprising:
1) quartz sand is pre-processed: Modified Quartz Sand is obtained to quartz sand surface modification using silane coupling agent；
2) viscous crude is mixed with the Modified Quartz Sand, stands aging at a temperature of target reservoir, obtains oil-sand；
3) oil-sand is mixed with highly viscous polyacrylamide or subject oil field application polymer solution, is obtained needed for experiment
Tamper sample；
In step 3), the operation that oil-sand is mixed with the polyacrylamide of high concentration or subject oil field application polymer solution
Are as follows: highly viscous polyacrylamide or subject oil field application polymer solution are uniformly smeared into a small thin layer on plate, it will be oily
Sand is spread on small thin layer and then topples over, and finally removes the oil-sand particle of adherency, stirs, and is uniformly mixed, and it is straight to repeat aforesaid operations
Object solution content, which is glued, to height contained in oil-sand reaches requirement.
2. according to the method described in claim 1, it is characterized by:；
In step 1), the quartz sand is the quartz sand of 40~80 mesh；
The silane coupling agent can be selected from following at least one: vinyl three ('beta '-methoxy ethyoxyl) silane, three second of isobutyl group
Oxysilane, gamma-aminopropyl-triethoxy-silane.
3. method according to claim 1 or 2, it is characterised in that: in step 2), the viscous crude is viscosity at 50 DEG C
5000-10000mPa.s viscous crude；
The mass ratio of the viscous crude and Modified Quartz Sand is 1:3~1:20；
The target reservoir temperature is 45-70 DEG C；
The time for standing aging is 24-48h.
4. method according to claim 1 or 2, it is characterised in that: in step 2), the oil content of the oil-sand is 5%-
25%.
5. method according to claim 1 or 2, it is characterised in that: in step 3), the highly viscous polyacrylamide is molten
Liquid is the normal part hydrolyzed polyacrylamide solution of viscosity 10000mPa.s at 40 DEG C.
6. passing through the simulation tamper of any one of claim 1-5 the method preparation.
7. simulation tamper according to claim 6, it is characterised in that: the simulation tamper is polymer
Be wrapped in heavy component wrap up again rock forming mineral, heavy component package rock forming mineral, heavy component package polymer,
Polymer package rock forming mineral, polymer package heavy component, heavy component are wrapped in organic high score
Sub- substance wraps up the form of rock forming mineral again.
8. a kind of experimental method for evaluating different de-plugging mode effects, includes the following steps:
Using one-dimensional sandpack column, one end is loaded with clean quartz sand, the blocking of simulation described in other end claim 6 or 7
Object filling, is filled the water by clean quartz sand end constant speed, is stablized to pressure, is recorded pressure and data on flows, is then pressed by tamper end
Experimental program injects de-plugging system, after closing is soaked for a period of time, opens valve and continues to be filled the water by clean quartz sand end constant speed, to
Pressure is stablized, and experiment terminates, and records pressure data and calculates comparison front and back permeability.
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| CN109100255B (en) * | 2018-08-27 | 2021-04-06 | 中国海洋石油集团有限公司 | Separation analysis method for components of oil field injection and production well plug |
| CN111808588B (en) * | 2020-07-14 | 2022-12-02 | 中海石油(中国)有限公司 | Simulation principle and preparation method of blockage in near-well zone of offshore oilfield polymer injection well |
| CN111808589B (en) * | 2020-07-14 | 2022-12-20 | 中海石油(中国)有限公司 | Simulation principle and preparation method of blockage in shaft of polymer injection well of offshore oil field |
| CN111929402B (en) * | 2020-08-12 | 2022-03-25 | 西南石油大学 | Open type experimental device and method for simulating single-section plug unblocking technological process |
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| CN113528101A (en) * | 2021-07-23 | 2021-10-22 | 中国石油大学(华东) | Outer flexible inner rigid type plugging material and preparation method thereof |
| CN114059998B (en) * | 2021-09-28 | 2023-07-28 | 中国海洋石油集团有限公司 | Device and method for simulating blockage of chemical flooding injection well and production well |
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