CN104726080A - Profile control agent for thickening water well thin oil and preparation method thereof - Google Patents
Profile control agent for thickening water well thin oil and preparation method thereof Download PDFInfo
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- CN104726080A CN104726080A CN201510112204.9A CN201510112204A CN104726080A CN 104726080 A CN104726080 A CN 104726080A CN 201510112204 A CN201510112204 A CN 201510112204A CN 104726080 A CN104726080 A CN 104726080A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title abstract description 17
- 230000008719 thickening Effects 0.000 title abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000003921 oil Substances 0.000 claims description 123
- 239000000203 mixture Substances 0.000 claims description 65
- 239000012752 auxiliary agent Substances 0.000 claims description 30
- 239000010779 crude oil Substances 0.000 claims description 18
- 230000018044 dehydration Effects 0.000 claims description 14
- 238000006297 dehydration reaction Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 4
- IJCWFDPJFXGQBN-UHFFFAOYSA-N 2-[4-Hydroxy-3-(octadecanoyloxy)oxolan-2-yl]-2-(octadecanoyloxy)ethyl octadecanoate Chemical group CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)C1OCC(O)C1OC(=O)CCCCCCCCCCCCCCCCC IJCWFDPJFXGQBN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- -1 sorbitan fatty acid ester Chemical class 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 37
- 239000007924 injection Substances 0.000 abstract description 37
- 230000008569 process Effects 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 2
- 239000008398 formation water Substances 0.000 abstract description 2
- 239000002562 thickening agent Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 18
- 230000001052 transient effect Effects 0.000 description 17
- 238000011049 filling Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000000605 extraction Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 239000000499 gel Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229910021536 Zeolite Inorganic materials 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000010457 zeolite Substances 0.000 description 4
- 102100028680 Protein patched homolog 1 Human genes 0.000 description 3
- 101710161390 Protein patched homolog 1 Proteins 0.000 description 3
- 102100036894 Protein patched homolog 2 Human genes 0.000 description 3
- 101710161395 Protein patched homolog 2 Proteins 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/502—Oil-based compositions
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides a profile control agent for thickening water well thin oil and a preparation method thereof. The profile control agent for thickening water well thin oil is composed of the following components in percentage by weight: 80-98% of dehydrated thin oil component, 1.5-15% of thickener component and 0.5-5% of assistant component. The profile control agent is suitable for an injection well thin oil thickening system in the later development period of oilfield injection water. The profile control agent provided by the invention has the characteristics of low viscosity in the injection process and quick viscosity increase when contacting formation water in the oil reservoir, can selectively plug the high-permeability zone in the oil reservoir, and obviously improves the water injection profile of the oil reservoir.
Description
Technical field
The present invention relates to geophysics field, improving oil recovery rate technology specifically by surveying, particularly one is used for well thin oil multiviscosisty amendment and preparation method thereof.
Background technology
The most of oil field of China adopts waterflooding mode, and the underground supplemented owing to causing after crude oil extraction is in debt, keeps simultaneously or improves sand pressure, realizing the high and stable yields of crude oil.At present, most water flood fields have entered " two high phase " mining phase of High water cut and high recovery percent of reserves, due to oil reservoir self nonuniformity feature, and waterflood flush function influence for many years, water injection well immediate vicinity of wellbore non-homogeneous degree aggravates further, causes injecting water along most permeable zone, macropore channelling, is formed and injects water inefficient cycle, low permeability layer water suction is not enough or inhale less than water, greatly lowers water flooding effect.
For improving intake profile, improve water flooding effect, Profile Control in Injection Well obtains in oil-field development extensively to be paid attention to and application.The amendment kind of current application is a lot, comprise: polymer gel class (Li Mingyuan etc. the preparation method CN1270967 of a kind of cross-linked polymer solution (LPS) deep electrical structure), foam class (Liu Hongsheng etc. a kind of foam profile control agent CN102516974A being applicable to oil field depth profile control), solid particulate class (Li Xiufeng etc. composite solid granular regulator CN1439692), zeolite (Su Yanchang etc. Zeolite profile control agent and the method CN1944573 to injecting zeolite amendment in profile control well) etc. amendment, but there is following shortcoming or deficiency in application at the scene:
(1) polymer gel class amendment is after formation core is sheared, and viscosity obviously reduces, not even plastic, causes intake profile to improve DeGrain.There is the problems such as foaming under formation condition is difficult, shut-off capacity is weak in foam class amendment.Particulate species amendment exists and stratum compatibility issues, and the material such as solid particulate, zeolite of injection easily injures reservoir, easily forms permanent pollution.
(2) amendment injected all can not realize selectively blocking off to oil-water-layer, i.e. water blockoff and stifled oil, but general by oil-water-layer together shutoff, causes part potentiality oil reservoir to start production.
(3) inject behind stratum cannot recycling for amendment, if oil well produced, also needs to take particular form to process, result in profile control Financial cost high with running cost.
Therefore, develop and a kind ofly do not injure reservoir, there is selectively blocking off, the low cost amendment of recyclable recycling to improving profile-log of water injection, expand and inject water swept volume, improve water flooding effect significant.
Summary of the invention
The object of the present invention is to provide a kind of for well thin oil multiviscosisty amendment and preparation method thereof, it is that one is applicable to water flooding later stage water injection well thin oil thickening system.Thin oil multiviscosisty amendment provided by the invention have injection process viscosity low, in oil reservoir, contact the feature that viscosity increases fast with local water, selectively blocking off most permeable zone can be realized in oil reservoir, obviously improve oil reservoir intake profile.
According to the first technical scheme of the present invention, there is provided a kind of for well thin oil multiviscosisty amendment, it is made up of the thin oil composition that dewaters, viscosifying agent composition and auxiliary agent composition, wherein calculate with weight ratio, dehydration thin oil composition accounts for 80%-98%, viscosifying agent composition accounts for 1.5%-15%, and auxiliary agent composition accounts for 0.5%-5%.
Preferably, be made up of for well thin oil multiviscosisty amendment the thin oil composition that dewaters, viscosifying agent composition and auxiliary agent composition, wherein calculate with weight ratio, dehydration thin oil composition accounts for 82%-97%, and viscosifying agent composition accounts for 2.5%-15%, and auxiliary agent composition accounts for 0.5%-3%.
More preferably, be made up of for well thin oil multiviscosisty amendment the thin oil composition that dewaters, viscosifying agent composition and auxiliary agent composition, wherein calculate with weight ratio, dehydration thin oil composition accounts for 97%, and viscosifying agent composition accounts for 2.5%, and auxiliary agent composition accounts for 0.5%.
The thin oil that wherein dewaters is crude oil after processed, and water ratio is less than 1%, 50 DEG C, viscosity is less than 50mPa.s under normal pressure.In dehydration thin oil composition, stable hydrocarbon is 35.12%, aromatic hydrocarbons be 32.75% nonhydrocarbon be 13.41% bituminous matter is 18.72%.The concrete composition of viscosifying agent is sorbitan fatty acid ester, and HLB value is 4.2.
Further, the concrete composition of auxiliary agent is sorbester p38, HLB value 2.1.
According to the second technical scheme of the present invention, there is provided a kind of and prepare the above-mentioned method for well thin oil multiviscosisty amendment, be made up of the thin oil that dewaters, viscosifying agent and auxiliary agent for well thin oil multiviscosisty amendment, three mixes on ground and obtains for the multiviscosisty of well thin oil.
Preferably, prepare the above-mentioned method for well thin oil multiviscosisty amendment to comprise the following steps:
The first step, 50 DEG C, test water ratio and the viscosity of dewatered oil under normal pressure (0.1013MPa), when water ratio is less than 1%, after viscosity is less than 50mPa.s, be defined as this amendment dewatered oil;
Second step, under normal temperature (30 DEG C), normal pressure (0.1013MPa), adds viscosifying agent, auxiliary agent successively, stirs 1 hour with the speed of 100 revs/min, make it mix, obtain thin oil multiviscosisty amendment in above-mentioned dewatered oil.
Compared with prior art, thin oil multiviscosisty amendment tool provided by the invention has the following advantages:
(1) crude oil is applied as main raw material, wide in oil field Raw source, and good with oil reservoir compatibleness, can dissolve each other with underground crude oil, not injure, do not pollute reservoir.
(2) thin oil multiviscosisty amendment has the quick thickening of chance water, meets oil not thickening feature, and alternative shutoff oil-water-layer, can flow after pressurization.
(3) amendment main component is crude oil, injects behind stratum, along with oil field is continually developed, also can back production out, recycle, Produced Liquid does not need special processing simultaneously, significantly reduces Financial cost.
(4) field conduct process is simple, without the need to building preparation, injection station and relative unit equipment, only injects with tank wagon.
Accompanying drawing explanation
Fig. 1 is the change curve of thin oil multiviscosisty amendment viscosity under different water cut condition;
Fig. 2 is the flow performance curve of thin oil multiviscosisty amendment;
Fig. 3 is thin oil multiviscosisty amendment Crude Oil rate of extraction curve;
Fig. 4 is the schematic diagram for well thin oil multiviscosisty amendment injection control system;
Fig. 5 is the schematic circuit of the lightning-proof protection circuit for well thin oil multiviscosisty amendment injection control system.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Additionally, protection scope of the present invention only should be limited to following concrete structure or parts or design parameter.
A kind of for well thin oil multiviscosisty amendment and preparation method thereof, it is that one is applicable to water flooding later stage water injection well thin oil thickening system.Thin oil multiviscosisty amendment provided by the invention have injection process viscosity low, in oil reservoir, contact the feature that viscosity increases fast with local water, selectively blocking off most permeable zone can be realized in oil reservoir, obviously improve oil reservoir intake profile.
The present invention also aims to the Detailed composition that above-mentioned water injection well thin oil multiviscosisty amendment is provided, amendment is made up of the thin oil composition that dewaters, viscosifying agent composition and auxiliary agent composition, wherein calculate with weight ratio, dehydration thin oil composition accounts for 80%-98%, viscosifying agent composition accounts for 1.5%-15%, and auxiliary agent composition accounts for 0.5%-5%.Preferably, be made up of for well thin oil multiviscosisty amendment the thin oil composition that dewaters, viscosifying agent composition and auxiliary agent composition, wherein calculate with weight ratio, dehydration thin oil composition accounts for 82%-97%, and viscosifying agent composition accounts for 2.5%-15%, and auxiliary agent composition accounts for 0.5%-3%.More preferably, calculate with weight ratio, dehydration thin oil composition accounts for 97%, and viscosifying agent composition accounts for 2.5%, and auxiliary agent composition accounts for 0.5%.
The thin oil that dewaters in thin oil multiviscosisty in-depth profile control provided by the invention is the crude oil after processed, and water ratio is less than 1%, 50 DEG C, viscosity is less than 50mPa.s under normal pressure.Dehydration thin oil composition is made up of following a few component:
| Stable hydrocarbon, % | Aromatic hydrocarbons, % | Nonhydrocarbon, % | Bituminous matter, % |
| 35.12 | 32.75 | 13.41 | 18.72 |
In thin oil multiviscosisty in-depth profile control provided by the invention, the concrete composition of viscosifying agent is sorbitan fatty acid ester, and HLB value is 4.2, has meet emulsifying water thickening feature with crude oil after mixing.
In thin oil multiviscosisty in-depth profile control provided by the invention, the concrete composition of auxiliary agent is sorbester p38, and HLB value 2.1, has the performances such as emulsification, thickening, dispersion, helps improve thickening effect.
The present invention also aims to the preparation method providing water injection well thin oil multiviscosisty amendment, this amendment is made up of the thin oil that dewaters, viscosifying agent and auxiliary agent, and three mixes on ground and obtains above-mentioned amendment.Concrete technical scheme according to the present invention is the above-mentioned preparation method being applicable to water injection well thin oil multiviscosisty amendment can comprise the following steps:
The first step, 50 DEG C, test water ratio and the viscosity of dewatered oil under normal pressure (0.1013MPa), when water ratio is less than 1%, after viscosity is less than 50mPa.s, be defined as this amendment dewatered oil.
Second step, under normal temperature (30 DEG C), normal pressure (0.1013MPa), adds viscosifying agent, auxiliary agent successively, stirs 1 hour with the speed of 100 revs/min, make it mix, obtain thin oil multiviscosisty amendment in above-mentioned dewatered oil.
Fig. 4 is the schematic diagram for well thin oil multiviscosisty amendment injection control system.Described injection control system is made up of high-pressure water inlet piping, auxiliary agent feeding unit, viscosifying agent feeding unit and a few major part of automatic control system, wherein high-pressure water inlet pipeline 1 is installed successively hand stop valve 2, motor-driven control valve 3, magnetic flow meter 4 and ejector 5, High-Pressure Water through ejector 5 time, linking agent liquid or polymer dry powder can suck in water lines by the negative pressure produced, and add in adjusting driving agnet tank 7.Agitator 6 is installed in adjusting driving agnet tank, can makes fully to mix into water and medicament.When in tank, liquid level reaches preset value, automatic program is out of service, and motorized valve cuts out automatically, and adjusting driving agnet automatic preparation completes.Stuff level switch 10 installed by the polymkeric substance storage tank 9 of auxiliary agent feeding unit, and discharge outlet installs blanking switch 11 and feeding screw 12, and during feed, polymkeric substance falls into hopper 14, it is equipped with stuff level switch 13, and is connected with the ejector 5 on suction culvert by flexible pipe.The drive-motor of feeding screw, frequency transformer and stuff level switch place are wired to controlling box 20.Viscosifying agent feeding unit has installed liquid level switch 16 on linking agent storage tank 15, and manual valve 17 is housed in exit, is connected to volume pump 18 subsequently.During charging, linking agent falls into hopper 19, and hopper is connected with the ejector 5 on suction culvert by flexible pipe.Volume pump and liquid level switch place are wired to controlling box 20.Automatic control system is by human and machine interface unit, central control unit and detecting unit composition, by detecting flooding velocity, implement PID to water inlet motor-driven control valve to regulate, carry out hand control box and automatically control two kinds of modes, according to processing requirement, define chain control with linking agent and polymer controls, complete the automatic control of whole system.
Motor-driven control valve can pilot piping keying and regulate the size of flooding velocity; The instantaneous delivery of water inlet and accumulative liquid inlet volume can be obtained by magnetic flow meter; High-Pressure Water, when ejector, can produce negative pressure and be sucked in adjusting driving agnet tank by medicament.Auxiliary agent feeding unit forms primarily of polymkeric substance storage tank 9, feeding screw 12 and dry powder hopper 14.The stuff level switch 10 that storage tank is installed can realize material low alarm function.The keying of feeding screw is controlled according to flooding quantity and feed time automatically by sequence of control, changes feeding quantity by frequency transformer adjusting screw axle rotating speed.During feed, polymkeric substance falls into dry powder hopper, and polymkeric substance is sucked under suction function by the ejector 5 on flexible pipe and suction culvert by hopper.Viscosifying agent feeding unit is made up of linking agent storage tank 15, volume pump 18 and linking agent hopper 19.Liquid level switch 16 realizes liquid level low alarm function.The keying of volume pump is controlled according to flooding quantity and feed time automatically by sequence of control, and its feed liquor speed is adjustable.During charging, linking agent falls into hopper 19, and linking agent is sucked under suction function by the ejector 5 on flexible pipe and suction culvert by hopper.
In addition; often use in the wild for well thin oil multiviscosisty amendment injection control system; often be subject to (nature) thunderbolt and damage; there is lightning prevention circuit in the present invention with for well thin oil multiviscosisty amendment injection control system is matching used; specifically shown in Figure 5, Fig. 5 is the schematic circuit of the lightning-proof protection circuit for well thin oil multiviscosisty amendment injection control system.
The design philosophy of this lightning-proof protection circuit is: adopt the compound lightning protection structure of two-stage, namely adopts gas discharge tube as first step lightning protection by input port, and output port adopts thermistor to add transient voltage suppressor diode as second stage lightning protection.First step lightning protection is made up of two gas discharge tubes, and carry out common mode protection respectively and protect with differential mode, through-current capability reaches 10KV/500A, voltage can be impaired to about 500V.Second stage lightning protection is made up of thermistor PTC and TVS pipe, and thermistor plays metering function, and after the pressure limiting of TVS pipe secondary, voltage is clamped at about 6.8V, thus protects 485 modular circuits.
Through test of many times, employ gas discharge tube in the present invention and adopt ceramic enclosed package, the inner metal electrode by two or several band gap, fills and is formed with rare gas element (argon gas or neon).The principle of work of gas discharge tube is geseous discharge, when impressed voltage increases above the insulation strength of gas, make the gas breakdown in gas discharge tube, the gap of gas discharge tube two interpolar is converted into conduction state by original state of insulation, low-resistance is become by high resistant, voltage after conducting between discharge tube the two poles of the earth maintains the residual voltage level that arc road determines, makes the voltage at electrode two ends be no more than voltage breakdown.Gas discharge tube is usually used in the first step in multi-level protection circuit or front two-stage, works release Lightning Transient overcurrent and over-voltage effect.Advantage: insulation resistance is very large, and stray capacitance is very little, and carrying out surge protection ability is strong, has symmetry of discharging preferably, is usually used in the protection of communication link.
TVS pipe and transient voltage suppressor are a kind of product innovations grown up on voltage stabilizing tube Process ba-sis, and when the high energy impact events of moment is stood at TVS pipe two ends, it can with 10
-12the speed of second-time; its impedance is reduced suddenly; the surge power of simultaneously stability up to thousands of watts; the voltage clamp of its go-and-retum is numerically predetermined at one; thus effectively protect circuit element below to damage from the impact of various transient state high energy surge pulse; its static discharge effect can discharge the pulse more than 10000V, more than 60A, and can continue 10ms.TVS pipe has that the time of response is fast, transient power is large, electric capacity is low, leakage current is low, voltage breakdown deviation is little, clamping voltage compared with easy to control, little without damage limit, volume, be easy to the advantages such as installation, be widely used in the every field such as computer system, communication equipment, consumer electronics, power supply, household electrical appliance at present.
With reference to accompanying drawing 5, show in particular the schematic circuit of lightning-proof protection circuit, gas discharge tube Q1 and gas discharge tube Q2 is connected in parallel on the two ends of 485 buses, and wherein the G of gas discharge tube Q2 holds ground connection; Thermistor PTC1 mono-termination 485 bus A hold and gas discharge tube Q1 and Q2, thermistor PTC1 another termination injection control system 485A hold and transient voltage suppressor TVS1 and TVS2; Another termination injection control system 485B of thermistor PTC2 mono-termination 485 bus B end and gas discharge tube Q1 and Q2, thermistor PTC2 holds and transient voltage suppressor TVS1 and TVS3; Transient voltage suppressor TVS1 mono-termination thermistor PTC1 and injection control system 485A holds, another termination thermistor PTC2 of transient voltage suppressor TVS1 and injection control system 485B holds; Another termination transient voltage suppressor TVS3 of transient voltage suppressor TVS2 mono-termination transient voltage suppressor TVS1 and injection control system 485A end, transient voltage suppressor TVS2 and ground end; Another termination transient voltage suppressor TVS2 of transient voltage suppressor TVS3 mono-termination transient voltage suppressor TVS1 and injection control system 485B end, transient voltage suppressor TVS3 and ground end.
When occurring when being struck by lightning, inducedover-voltage is introduced by 485 bus A, B port, and gas discharge tube Q2 carries out common mode protection, and gas discharge tube Q1 carries out differential mode protection, and now superpotential is weakened severely about 500V.When input voltage is excessive, the electric current in thermistor PTC and TVS pipe series loop will become greatly, and when this electric current exceedes the action current of thermistor, the resistance of thermistor becomes rapidly large, whole loop current is diminished rapidly, plays metering function.When voltage is excessive, the impedance of TVS pipe reduces suddenly, and simultaneously stability big current, makes the voltage at its two ends reduce rapidly, and the voltage being input to injection control system 485 module so is just clamped at about 6.8V, achieves lightning protection effect.Repeatedly test in the highest testing standard 10/700us of communication link, 4KV environment, lightning protection effect is good, injection control system working stability, does not occur crashing, communicate the problem such as unsuccessful.
Below by embodiment, the present invention is further described.
Embodiment 1: thin oil multiviscosisty amendment is prepared
Preparation experiment simulated formation water, the ion content of preparation water is in table 1.Take dehydration thin oil 194g, be placed in 1000ml beaker, add 5..0g viscosifying agent, 1..0g auxiliary agent in beaker successively, carry out stirring 1 hour with agitator, obtained thin oil multiviscosisty profile control drives agent.
The ion content of water prepared by table 1
Embodiment 2: the change of thin oil multiviscosisty adjusting driving agnet viscosity under different water cut condition
According to the method preparing thin oil multiviscosisty amendment in embodiment 1, respectively to adding stratum Simulated Water in adjusting driving agnet, make thin oil multiviscosisty amendment under different water cut (10%, 30%, 50%, 70%, 80%, 90%) condition.Be placed in the thermostat container constant temperature that temperature is 50 DEG C, with Brookfield DV-II rotational viscosimeter (temperature 50 C, shearing rate 7.34s
-1) measure the viscosity of thin oil multiviscosisty amendment.As shown in Figure 1, along with water ratio raises in amendment, viscosity obviously increases experimental result, rises to 12000mPa.s by initial 30mPa.s.Show that this amendment constantly contacts along with local water after injecting stratum, adjusting driving agnet is moisture to be raised gradually, and viscosity increases fast, and shutoff most permeable zone, improves profile-log of water injection.
Embodiment 3: the flow performance of thin oil multiviscosisty amendment
According to the method preparation thin oil multiviscosisty amendment in embodiment 1, in 50 DEG C of thermostat containers, to inject the amendment of preparation in the one dimension sand-filling tube model of 0.3ml/min speed respectively to long 30cm, diameter 2.5cm, injection rate is 0.5 times of volume of voids, sand-filling tube model is moisture is 100%, 5%, after placing 24h, inject stratum Simulated Water, thin oil with 0.3ml/min speed respectively in one dimension sand-filling tube model, pressure change in record experimentation.The flow performance curve of thin oil multiviscosisty amendment as shown in Figure 4.Before profile control, the porosity of one dimension sand-filling tube model is 29.58%, and rate of permeation is 0.942 μm
2, moisture after injection profile agent be the rate of permeation of the one dimension sand-filling tube model of 100% is 0.064 μm
2, the sealing ratiod of amendment is 93.2%; Moisture be the rate of permeation of the one dimension sand-filling tube model of 5% is 0.512 μm
2, after injection profile agent, rate of permeation is 0.490 μm
2sealing ratiod is 4.3%, illustrate that the most permeable zone that this amendment is higher to water ratio has stronger shut-off capacity, to water ratio lower ground pervious course substantially without plugging action, namely show that thin oil multiviscosisty amendment of the present invention has the feature of shutoff water layer and stifled oil reservoir.
Embodiment 4: the thin oil multiviscosisty amendment Crude Oil rate of extraction
According to the method preparation thin oil multiviscosisty amendment in embodiment 1, in 50 DEG C of thermostat containers, to inject the amendment of preparation in the one dimension sand-filling tube model of 0.3ml/min speed respectively to long 30cm, diameter 2.5cm, injection rate is 1.0 times of volume of voids, sand-filling tube model is moisture is 100%, after placing 24h, injects stratum Simulated Water with 0.3ml/min speed respectively in one dimension sand-filling tube model, the crude oil amount be plucked out of in record experimentation, till exit end is not fuel-displaced.Thin oil multiviscosisty amendment crude oil rate of extraction curve as shown in Figure 5.Crude oil is not contained in one dimension sand-filling tube model before profile control, porosity is 30.1%, injection profile agent Crude Oil volume is 44.2ml, the crude oil volume that water drive terminates rear extraction is 36.3ml, the crude oil rate of extraction is 82.1%, show that in amendment of the present invention, most of crude oil can be gone out by back production, not only significantly reduces experimentation cost, and does not produce injury effect to oil reservoir.
Embodiment 5: thin oil multiviscosisty amendment and visco-elasticity Weak Gels class performance of profile modification parameter comparison
According to the method preparing thin oil multiviscosisty amendment in embodiment 1, prepare moisture be 70% thin oil multiviscosisty amendment, under 80 DEG C of conditions, carry out viscosity, thermostability, shutoff efficiency with visco-elasticity Weak Gels class amendment, improve the performance perameter such as oil displacement efficiency, the rate of extraction and contrast, as shown in table 1, thin oil multiviscosisty amendment use properties of the present invention is obviously better than conventional visco-elasticity Weak Gels class adjusting driving agnet, can increase substantially oil displacement efficiency.
Following table is thin oil multiviscosisty amendment and visco-elasticity Weak Gels class performance of profile modification parameter comparison.
| Performance perameter | Thin oil multiviscosisty amendment | Visco-elasticity Weak Gels class amendment |
| Viscosity, mPa.s | 8500 | 1255 |
| Thermostability, d | 30 | 11 |
| Shutoff efficiency, % | 98.5 | 85.7 |
| Improve oil displacement efficiency, % | 20.3 | 9.5 |
| The rate of extraction, % | 81.5 | 4.8 |
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.This area those skilled in the art are appreciated that when not deviating from the spirit and scope of the present invention of claims definition, can make various amendment in form and details.
Claims (9)
1. for a well thin oil multiviscosisty amendment, it is made up of the thin oil composition that dewaters, viscosifying agent composition and auxiliary agent composition, wherein calculates with weight ratio, and dehydration thin oil composition accounts for 80%-98%, and viscosifying agent composition accounts for 1.5%-15%, and auxiliary agent composition accounts for 0.5%-5%.
2. according to claim 1 for well thin oil multiviscosisty amendment, it is made up of the thin oil composition that dewaters, viscosifying agent composition and auxiliary agent composition, wherein calculates with weight ratio, and dehydration thin oil composition accounts for 82%-97%, viscosifying agent composition accounts for 2.5%-15%, and auxiliary agent composition accounts for 0.5%-3%.
3. according to claim 1 for well thin oil multiviscosisty amendment, it is made up of the thin oil composition that dewaters, viscosifying agent composition and auxiliary agent composition, wherein calculates with weight ratio, and dehydration thin oil composition accounts for 97%, and viscosifying agent composition accounts for 2.5%, and auxiliary agent composition accounts for 0.5%.
4. according to claim 1 for well thin oil multiviscosisty amendment, it is characterized in that, dehydration thin oil is crude oil after processed, and water ratio is less than 1%, 50 DEG C, viscosity is less than 50mPa.s under normal pressure.
5. according to claim 1 for well thin oil multiviscosisty amendment, it is characterized in that, in dehydration thin oil composition, stable hydrocarbon is 35.12%, aromatic hydrocarbons be 32.75% nonhydrocarbon be 13.41% bituminous matter is 18.72%.
6. arbitrary for well thin oil multiviscosisty amendment according to claim 2-3, it is characterized in that, the concrete composition of viscosifying agent is sorbitan fatty acid ester, and HLB value is 4.2.
7. arbitrary for well thin oil multiviscosisty amendment according to claim 2-3, it is characterized in that, the concrete composition of auxiliary agent is sorbester p38, HLB value 2.1.
8. prepare the method for well thin oil multiviscosisty amendment of the claims, it is characterized in that, this is used for well thin oil multiviscosisty amendment and is made up of the thin oil that dewaters, viscosifying agent and auxiliary agent, and three mixes on ground and obtains for the multiviscosisty of well thin oil.
9., according to the method for claim 8, it is characterized in that, it comprises the following steps:
The first step, 50 DEG C, test water ratio and the viscosity of dewatered oil under normal pressure (0.1013MPa), when water ratio is less than 1%, after viscosity is less than 50mPa.s, be defined as this amendment dewatered oil;
Second step, under normal temperature (30 DEG C), normal pressure (0.1013MPa), adds viscosifying agent, auxiliary agent successively, stirs 1 hour with the speed of 100 revs/min, make it mix, obtain thin oil multiviscosisty amendment in above-mentioned dewatered oil.
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Effective date of registration: 20201118 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: PetroChina Company Limited Address before: 124010 Experimental Technology Research Institute of Liaohe oilfield exploration and development, Xinglongtai District, Panjin, Liaoning Patentee before: Xiao Chuanmin |