CN104726080B - One kind is used for well thin oil thickening profile control agent and preparation method thereof - Google Patents
One kind is used for well thin oil thickening profile control agent and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of well that is used for and is thickened thin oil profile control agent and preparation method thereof, it is made up of for well thickening thin oil profile control agent dehydration thin oil composition, thickening agent composition and auxiliary agent composition, wherein calculated with weight ratio meter, dehydration thin oil composition accounts for 80% 98%, thickening agent composition accounts for 1.5% 15%, and auxiliary agent composition accounts for 0.5% 5%.The present invention is that a kind of water flooding later stage water injection well that is applied to is thickened thin oil system, the thickening thin oil profile control agent that the present invention is provided has that injection process viscosity is low, in oil reservoir with stratum water contact the characteristics of viscosity quickly increases, selective shut-off high permeability zone can be realized in oil reservoir, hence it is evident that improve oil reservoir intake profile.
Description
Technical field
The present invention relates to geophysics field, oil recovery rate technology, more particularly to one are improved specifically by exploration
Planting is used for well thin oil thickening profile control agent and preparation method thereof.
Background technology
The most of oil fields of China use waterflooding extraction mode, and the underground supplemented caused by after crude oil extraction is in debt, together
When keep or improve formation pressure, realize the high and stable yields of crude oil.At present, most water flood fields have been enter into High water cut and high extraction
" double high phases " mining phase of degree, due to oil reservoir itself anisotropism feature, and waterflood flush function influence for many years, water injection well
Near wellbore zone non-homogeneous degree is further exacerbated by, and causes injection water along high permeability zone, macropore channelling, forms injection water is invalid and follow
Ring, less permeable layer water suction is not enough or inhales less than water, lowers water flooding effect significantly.
To improve intake profile, water flooding effect is improved, Profile Control in Injection Well has been obtained extensively in oil field development
Pay attention to and apply.The profile control agent species applied at present is a lot, including：A kind of polymer gel class (cross-linked polymers of the such as Li Mingyuan
The preparation method CN1270967 of solution (LPS) deep electrical structure), foam class (such as Liu Hongsheng one kind be applied to oil field depth adjust
The foam profile control agent CN102516974A cutd open), solid particle class (the composite solid granular regulators such as Li Xiufeng
CN1439692), zeolite (such as Su Yanchang Zeolite profile control agents and into profile control well injecting zeolite profile control agent method CN1944573)
Following shortcoming or deficiency are there is Deng profile control agent, but at the scene in application：
(1) after polymer gel class profile control agent is sheared through formation core, viscosity is substantially reduced, not even plastic, causes to inhale
Water section improvement is not obvious.There is the difficult, shut-off capacity that foamed under formation condition in foam class profile control agent.Particulate species
Profile control agent is present easily injures reservoir with stratum compatibility issues, the material such as solid particle, the zeolite of injection, easily forms permanent
Pollution.
(2) profile control agent of injection can not realize selective shut-off, i.e. water blockoff to oil-water-layer without stifled oil, but generally will
Oil-water-layer is blocked together, causes part potentiality oil reservoir can not start production.
(3) profile control agent injection stratum after can not recycling, if oil well produced, also need to take particular form to carry out
Processing, result in profile control financial cost and is remained high with running cost.
Therefore, develop and a kind of do not injure reservoir, the inexpensive profile control agent pair with selective shut-off, recyclable recycling
Improve profile-log of water injection, expand injection water swept volume, improve water flooding effect significant.
The content of the invention
It is used for well thin oil thickening profile control agent and preparation method thereof it is an object of the invention to provide one kind, it is a kind of suitable
For water flooding later stage water injection well thin oil thickening system.The thin oil thickening profile control agent that the present invention is provided has injection process
Viscosity is low, with stratum water contact the characteristics of viscosity quickly increases in oil reservoir, and selective shut-off Thief zone can be realized in oil reservoir
Layer, hence it is evident that improve oil reservoir intake profile.
The first technical scheme according to the present invention is used for well thin oil there is provided one kind and is thickened profile control agent, and it is by dehydration thin oil
Composition, thickening agent composition and auxiliary agent composition composition, wherein being calculated with weight ratio meter, dehydration thin oil composition accounts for 80%-98%, thickening agent
Composition accounts for 1.5%-15%, and auxiliary agent composition accounts for 0.5%-5%.
Preferably, it is made up of for well thin oil thickening profile control agent dehydration thin oil composition, thickening agent composition and auxiliary agent composition,
Wherein calculated with weight ratio meter, dehydration thin oil composition accounts for 82%-97%, and thickening agent composition accounts for 2.5%-15%, and auxiliary agent composition is accounted for
0.5%-3%.
It is highly preferred that being thickened profile control agent by dehydration thin oil composition, thickening agent composition and auxiliary agent composition group for well thin oil
Into wherein being calculated with weight ratio meter, dehydration thin oil composition accounts for 97%, and thickening agent composition accounts for 2.5%, and auxiliary agent composition accounts for 0.5%.
Wherein dehydration thin oil is crude oil after dewater treatment, and moisture content is less than 1%, 50 DEG C, viscosity is less than under normal pressure
50mPa.s.It is that 35.12%, aromatic hydrocarbons is that 32.75% nonhydrocarbon is that 13.41% asphalitine is to be dehydrated saturated hydrocarbons in thin oil composition
18.72%.The specific composition of thickening agent is sorbitan fatty acid ester, and HLB value is 4.2.
Further, the specific composition of auxiliary agent is sorbester p38, HLB value 2.1.
The second technical scheme according to the present invention prepares the above-mentioned side that profile control agent is thickened for well thin oil there is provided a kind of
Method, is made up of, three mixes on ground and obtained for well thin oil thickening profile control agent dehydration thin oil, thickening agent and auxiliary agent
For the thickening of well thin oil.
Preferably, the above-mentioned method for being thickened profile control agent for well thin oil is prepared to comprise the following steps：
The first step, tests the moisture content and viscosity of dewatered oil, when moisture content is small under 50 DEG C, normal pressure (0.1013MPa)
In 1%, viscosity is less than after 50mPa.s, is defined as the profile control agent dewatered oil；
Second step, under normal temperature (30 DEG C), normal pressure (0.1013MPa), successively into above-mentioned dewatered oil add thickening agent,
Auxiliary agent, is stirred 1 hour with 100 revs/min of speed, is well mixed it, obtains thin oil thickening profile control agent.
Compared with prior art, the thin oil thickening profile control agent that the present invention is provided has the following advantages that：
(1) application crude oil is as primary raw material, and raw material sources are wide in oil field, and good with oil reservoir compatibility, energy and underground
Crude oil dissolves each other, and does not injure, does not pollute reservoir.
(2) thin oil is thickened profile control agent, and there is chance water, which quickly to viscosify, meet oil does not viscosify feature, and alternative blocks oil-water-layer,
It is flowable after pressurization.
(3) profile control agent main component be crude oil, injection stratum after, as oil field is continually developed, can also back production come out, carry out
Recycle, while Produced Liquid is not required to specially treated, significantly reduce financial cost.
(4) field conduct process is simple, without building preparation, injection station and relevant apparatus equipment, is only injected with oil truck
.
Brief description of the drawings
Fig. 1 is the change curve of thin oil thickening profile control agent viscosity under the conditions of different water cut；
Fig. 2 is the flow performance curve that thin oil is thickened profile control agent；
Fig. 3 is that thin oil is thickened profile control agent Crude Oil rate of extraction curve；
Fig. 4 is the schematic diagram that profile control agent injection control system is thickened for well thin oil；
Fig. 5 is the circuit diagram for the lightning-proof protection circuit that profile control agent injection control system is thickened for well thin oil.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.Additionally, protection scope of the present invention should not be only limited to following
Concrete structure or part or design parameter.
One kind is used for well thin oil thickening profile control agent and preparation method thereof, and it is a kind of suitable for the water flooding later stage
Water injection well thin oil thickening system.Thin oil that the present invention is provided thickening profile control agent have injection process viscosity it is low, in oil reservoir with ground
The characteristics of layer water contact viscosity quickly increases, can realize selective shut-off high permeability zone in oil reservoir, hence it is evident that improve oil reservoir water suction
Section.
The Detailed composition of profile control agent is thickened the present invention also aims to provide above-mentioned water injection well thin oil, profile control agent is by being dehydrated
Thin oil composition, thickening agent composition and auxiliary agent composition composition, wherein being calculated with weight ratio meter, dehydration thin oil composition accounts for 80%-98%, thick
Agent composition accounts for 1.5%-15%, and auxiliary agent composition accounts for 0.5%-5%.Preferably, profile control agent is thickened by being dehydrated for well thin oil
Thin oil composition, thickening agent composition and auxiliary agent composition composition, wherein being calculated with weight ratio meter, dehydration thin oil composition accounts for 82%-97%, thick
Agent composition accounts for 2.5%-15%, and auxiliary agent composition accounts for 0.5%-3%.It is highly preferred that being calculated with weight ratio meter, dehydration thin oil composition is accounted for
97%, thickening agent composition accounts for 2.5%, and auxiliary agent composition accounts for 0.5%.
Dehydration thin oil is the crude oil after dewater treatment, moisture content in the thin oil thickening in-depth profile control that the present invention is provided
It is less than 50mPa.s less than viscosity under 1%, 50 DEG C, normal pressure.Dehydration thin oil composition is made up of following groups point:
| Saturated hydrocarbons, % | Aromatic hydrocarbons, % | Nonhydrocarbon, % | Asphalitine, % |
| 35.12 | 32.75 | 13.41 | 18.72 |
The specific composition of thickening agent is sorbitan fatty acid ester in the thin oil thickening in-depth profile control that the present invention is provided,
HLB value is 4.2, has after being mixed with crude oil and meets water emulsification thickening feature.
The specific composition of auxiliary agent is sorbester p38, HLB value 2.1, with breast in the thin oil thickening in-depth profile control that the present invention is provided
The performance such as change, thickening, scattered, helps improve thickening effect.
The preparation method of profile control agent is thickened the present invention also aims to provide upper water injection well thin oil, the profile control agent is by being dehydrated
Thin oil, thickening agent and auxiliary agent composition, three mixes on ground obtains above-mentioned profile control agent.According to the particular technique of the present invention
The above-mentioned preparation method for being thickened profile control agent suitable for water injection well thin oil of scheme may comprise steps of：
The first step, tests the moisture content and viscosity of dewatered oil, when moisture content is small under 50 DEG C, normal pressure (0.1013MPa)
In 1%, viscosity is less than after 50mPa.s, is defined as the profile control agent dewatered oil.
Second step, under normal temperature (30 DEG C), normal pressure (0.1013MPa), successively into above-mentioned dewatered oil add thickening agent,
Auxiliary agent, is stirred 1 hour with 100 revs/min of speed, is well mixed it, obtains thin oil thickening profile control agent.
Fig. 4 is the schematic diagram that profile control agent injection control system is thickened for well thin oil.The injection control system is by height
It is pressed into hydraulic pipeline, auxiliary agent feed arrangement, thickening agent feed arrangement and automatic control system several major to constitute, its mesohigh enters
Hand stop valve 2, electric control valve 3, electromagnetic flowmeter 4 and ejector 5 are mounted with water lines 1 successively, in High-Pressure Water warp
During ejector 5, the negative pressure of generation can suck crosslinking agent liquid or polymer dry powder in water lines, add in profile control agent tank 7.
Agitator 6 is installed in profile control agent tank, can make to be sufficiently mixed into water and medicament.When liquid level reaches preset value in tank, from
Program stopped operation is controlled, motor-driven valve is closed automatically, and profile control agent prepares completion automatically.On the polymer storage tank 9 of auxiliary agent feed arrangement
Stuff level switch 10 is installed, discharge outlet installs blanking switch 11 and feeding screw 12, and polymer falls into hopper 14 during feed, its
It is upper that stuff level switch 13 is housed, and be connected by flexible pipe with the ejector 5 on inlet pipeline.The motor of feeding screw, change
Control cabinet 20 is wired at frequency device and stuff level switch.Thickening agent feed arrangement is mounted with liquid-level switch on crosslinking agent storage tank 15
16, hand-operated valve 17 is housed in exit, measuring pump 18 is subsequently connected to.Crosslinking agent falls into hopper 19 during charging, and hopper passes through soft
Pipe is connected with the ejector 5 on inlet pipeline.Control cabinet 20 is wired at measuring pump and liquid-level switch.Automatic control system by
Human and machine interface unit, central control unit and detection unit composition, by detecting flow of inlet water, implement to water inlet electric control valve
PID is adjusted, and is carried out hand control box and is automatically controlled two ways, according to technological requirement, is formed with crosslinking agent and polymer controls
Chain control, completes automatically controlling for whole system.
Electric control valve can control the keying of pipeline and adjust the size of flow of inlet water；It can be entered by electromagnetic flowmeter
The instantaneous delivery of water and accumulative liquid inlet volume；When High-Pressure Water is through ejector, negative pressure can be produced and suck medicament in profile control agent tank.Help
Agent feed arrangement is mainly made up of polymer storage tank 9, feeding screw 12 and dry powder hopper 14.The stuff level switch installed on storage tank
10 can realize material low alarm function.The keying of feeding screw is controlled automatically by control program according to inflow and feed time
System, can adjust speed of screw shaft by frequency converter and change feeding quantity.Polymer falls into dry powder hopper during feed, and hopper passes through flexible pipe
Polymer is sucked under suction function with the ejector 5 on inlet pipeline.Thickening agent feed arrangement is by crosslinking agent storage tank 15, meter
Amount pump 18 and crosslinking agent hopper 19 are constituted.Liquid-level switch 16 realizes liquid level low alarm function.The keying of measuring pump is by control journey
Sequence is automatically controlled according to inflow and feed time, and its feed speed is adjustable.Crosslinking agent falls into hopper 19 during charging, and hopper passes through
Flexible pipe sucks crosslinking agent under suction function with the ejector 5 on inlet pipeline.
In addition, often being used in the wild for well thin oil thickening profile control agent injection control system, it is often subject to (nature)
Thunderbolt and damages, in the present invention with being thickened that profile control agent injection control system is matching used anti-lightning strike electricity for well thin oil
Road, referring specifically to shown in Fig. 5, Fig. 5 is the lightning-proof protection circuit that profile control agent injection control system is thickened for well thin oil
Circuit diagram.
The design philosophy of the lightning-proof protection circuit is：Using the compound lightning protection structure of two-stage, i.e., used by input port
Gas-discharge tube adds transient voltage suppressor diode as second as first order lightning protection, output port using thermistor
Level lightning protection.First order lightning protection is made up of two gas-discharge tubes, and common mode protection is carried out respectively and is protected with differential mode, through-flow
Ability reaches 10KV/500A, voltage can be impaired into 500V or so.Second level lightning protection is by thermistor PTC and TVS pipe group
Into thermistor plays metering function, and after the secondary pressure limiting of TVS pipe, voltage is clamped at 6.8V or so, so as to protect 485
Modular circuit.
By test of many times, gas-discharge tube has been used in the present invention using ceramic enclosed package, inside by two or
The metal electrode of several band gaps, is filled with inert gas (argon gas or neon) composition.The operation principle of gas-discharge tube is gas
Electric discharge, when applied voltage increases above the dielectric strength of gas, makes the gas breakdown in gas-discharge tube, gas-discharge tube
The gap of two interpolars is converted into conduction state by original state of insulation, by high resistant become after low-resistance, conducting discharge tube the two poles of the earth it
Between voltage maintain the residual voltage level that electric arc channel is determined of putting, make electrode two ends voltage be no more than breakdown voltage.Gas is put
Fulgurite is usually used in the first order or preceding two-stage in multi-level protection circuit, acts release Lightning Transient overcurrent and over-voltage work
With.Advantage：Insulaion resistance is very big, parasitic capacitance very little, and carrying out surge protection ability is strong, has preferably electric discharge symmetry, is usually used in leading to
Believe the protection of circuit.
TVS pipe is transient voltage suppressor, is a kind of new product grown up on voltage-stabiliser tube Process ba- sis, when
When TVS pipe two ends are subjected to the high energy impact events of moment, it can be with 10-12The speed of second-time, makes its impedance reduce suddenly, simultaneously
Absorb up to thousands of watts of surge power, by the voltage clamp between its two ends one it is predetermined numerically, so as to effectively protect
The circuit element of shield below is damaged from the impact of various transient state high energy surge pulses, and its static discharge effect can discharge super
10000V, more than 60A pulse are crossed, and 10ms can be continued.TVS pipe has that the response time is fast, transient power is big, electric capacity is low, leakage
Electric current is low, breakdown voltage deviation is small, clamp voltage is relatively easy to control, without damage limit, small volume, be easily installed the advantages of, at present
It is widely used to the every field such as computer system, communication apparatus, consumer electronics, power supply, household electrical appliance.
Refer to the attached drawing 5, show in particular the circuit diagram of lightning-proof protection circuit, gas-discharge tube Q1 and gas-discharge tube Q2
It is connected in parallel on the two ends of 485 buses, wherein gas-discharge tube Q2 G ends ground connection；Thermistor PTC1 mono- terminate 485 bus A ends and
Gas-discharge tube Q1 and Q2, thermistor PTC1 another termination injection control system 485A ends and transient voltage suppressor
TVS1 and TVS2；Thermistor PTC2 mono- terminate 485 bus B ends and gas-discharge tube Q1 and Q2, thermistor PTC2 it is another
Terminate injection control system 485B ends and transient voltage suppressor TVS1 and TVS3；Transient voltage suppressor TVS1 mono-
Terminate thermistor PTC1 and injection control system 485A ends, transient voltage suppressor TVS1 another termination thermistor
PTC2 and injection control system 485B ends；Transient voltage suppressor TVS2 mono- terminate transient voltage suppressor TVS1 and
Injection control system 485A ends, transient voltage suppressor TVS2 another termination transient voltage suppressor TVS3 and ground
End；Transient voltage suppressor TVS3 mono- terminates transient voltage suppressor TVS1 and injection control system 485B ends, wink
Time variant voltage suppresses diode TVS3 another termination transient voltage suppressor TVS2 and ground terminal.
When occurring when being struck by lightning, induced overvoltage is introduced by 485 bus A, B ports, and gas-discharge tube Q2 carries out common mode protection,
Gas-discharge tube Q1 carries out differential mode protection, and now overvoltage is weakened severely 500V or so.When input voltage is excessive, temperature-sensitive electricity
Hindering the electric current in PTC and TVS pipe series loop will become big, when this electric current exceedes the action current of thermistor, thermistor
Resistance become big rapidly, whole loop current is diminished rapidly, play metering function.When voltage is excessive, the impedance of TVS pipe is suddenly
Reduction, while absorbing a high current, making the voltage at its two ends reduces rapidly, is so input to the module of injection control system 485
Voltage be just clamped at 6.8V or so, realize lightning protection effect.In highest the testing standard 10/700us, 4KV of communication line
Tested repeatedly in environment, lightning protection effect is good, and unsuccessful etc. ask of crashing, communicate does not occur in injection control system working stability
Topic.
The present invention is further described below by embodiment.
Embodiment 1：Thin oil thickening profile control agent is prepared
Preparation experiment simulated formation water, the ion concentration for preparing water is shown in Table 1.Dehydration thin oil 194g is weighed, is placed in
In 1000ml beakers, 5..0g thickening agents, 1..0g auxiliary agents are sequentially added into beaker, is stirred with agitator 1 hour, is made
Thin oil thickening profile control drives agent.
Table 1 prepares the ion concentration of water
Embodiment 2：Thin oil is thickened the change of profile control agent viscosity under the conditions of different water cut
According to the method that thin oil is thickened profile control agent is prepared in embodiment 1, stratum simulation water is added into profile control agent respectively, is matched somebody with somebody
Make thin oil thickening profile control agent under the conditions of different water cut (10%, 30%, 50%, 70%, 80%, 90%).It is 50 to be placed in temperature
DEG C insulating box in constant temperature, with the rotation viscometers of Brookfield DV- II (temperature 50 C, shear rate 7.34s-1) determine dilute
The viscosity of oil thickening profile control agent.Experimental result is as shown in figure 1, as moisture content is raised in profile control agent, viscosity substantially increases, by first
Beginning, 30mPa.s rose to 12000mPa.s.Show behind profile control agent injection stratum with constantly being contacted with stratum water, profile control agent contains
Water gradually rises, and viscosity quickly increases, and blocks high permeability zone, improves profile-log of water injection.
Embodiment 3：Thin oil is thickened the flow performance of profile control agent
Thin oil thickening profile control agent is prepared according to the method in embodiment 1, in 50 DEG C of insulating boxs, with 0.3ml/min speed
The profile control agent of preparation is injected into long 30cm, diameter 2.5cm one-dimensional sand-filling tube model respectively, injection rate is 0.5 times of pore-body
Product, aqueous sand-filling tube model is 100%, 5%, is placed after 24h, with 0.3ml/min speed respectively into one-dimensional sand-filling tube model
Inject pressure change in stratum simulation water, thin oil, record experimentation.Thin oil is thickened flow performance curve such as Fig. 4 of profile control agent
It is shown.The porosity of one-dimensional sand-filling tube model is 29.58% before profile control, and permeability is 0.942 μm2, it is aqueous after injection profile agent
It it is 0.064 μm for the permeability of 100% one-dimensional sand-filling tube model2, the sealing ratiod of profile control agent is 93.2%；Aqueous is 5%
The permeability of one-dimensional sand-filling tube model is 0.512 μm2, permeability is 0.490 μm after injection profile agent2, sealing ratiod is 4.3%, is said
Bright profile control agent high permeability zone higher to moisture content has stronger shut-off capacity, and to moisture content, lower ground permeable formation is basic
Without plugging action, that is, show that thin oil thickening profile control agent of the present invention has the characteristics of closure water layer is without stifled oil reservoir.
Embodiment 4：Thin oil is thickened the profile control agent Crude Oil rate of extraction
Thin oil thickening profile control agent is prepared according to the method in embodiment 1, in 50 DEG C of insulating boxs, with 0.3ml/min speed
The profile control agent of preparation is injected into long 30cm, diameter 2.5cm one-dimensional sand-filling tube model respectively, injection rate is 1.0 times of pore-bodies
Product, aqueous sand-filling tube model is 100%, is placed after 24h, is injected respectively into one-dimensional sand-filling tube model with 0.3ml/min speed
The crude oil amount being plucked out of in stratum simulation water, record experimentation, untill the port of export is not fuel-displaced.Thin oil thickening profile control agent is former
Oily rate of extraction curve is as shown in Figure 5.Crude oil is free of before profile control in one-dimensional sand-filling tube model, porosity is 30.1%, injection profile
Agent Central Plains oil volume is 44.2ml, and the crude oil volume that water drive is produced after terminating is 36.3ml, and the crude oil rate of extraction is 82.1%, is shown
Most of crude oil can be gone out by back production in profile control agent of the present invention, not only significantly reduce experimentation cost, and oil reservoir is not produced
Injury effect.
Embodiment 5：Thin oil is thickened profile control agent and viscoplasticity Weak Gels class performance of profile modification parameter comparison
According to the method that thin oil is thickened profile control agent is prepared in embodiment 1, the aqueous thin oil thickening profile control agent for being 70% is prepared,
Under the conditions of 80 DEG C, with viscoplasticity Weak Gels class profile control agent carry out viscosity, heat endurance, closure efficiency, improve oil displacement efficiency, return
The contrast of the performance parameters such as rate is adopted, as shown in table 1, thin oil thickening profile control agent performance of the invention is substantially better than conventional viscoelastic
Property Weak Gels class profile control agent, can increase substantially oil displacement efficiency.
Following table is thin oil thickening profile control agent and viscoplasticity Weak Gels class performance of profile modification parameter comparison.
| Performance parameter | Thin oil is thickened profile control agent | Viscoplasticity Weak Gels class profile control agent |
| Viscosity, mPa.s | 8500 | 1255 |
| Heat endurance, d | 30 | 11 |
| Block efficiency, % | 98.5 | 85.7 |
| Improve oil displacement efficiency, % | 20.3 | 9.5 |
| The rate of extraction, % | 81.5 | 4.8 |
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Those skilled in the art is appreciated that without departing substantially from appended right
It is required that in the case of the spirit and scope of the present invention of definition, various modifications can be made in form and details.
Claims (5)
1. one kind, which is used for well thin oil, is thickened profile control agent, it is made up of dehydration thin oil composition, thickening agent composition and auxiliary agent composition, its
In it is calculated in weight percent, dehydration thin oil composition account for 80%-98%, thickening agent composition accounts for 1.5%-15%, and auxiliary agent composition is accounted for
0.5%-5%；
Wherein dehydration thin oil is crude oil after dewater treatment, and moisture content is less than 1%, 50 DEG C, viscosity is less than under normal pressure
50mPa·s；It is that 35.12%, aromatic hydrocarbons is that 32.75%, nonhydrocarbon is that 13.41%, asphalitine is to be dehydrated saturated hydrocarbons in thin oil composition
18.72%；The specific composition of thickening agent is sorbitan fatty acid ester, and HLB value is 4.2；The specific composition of auxiliary agent is sorbester p38,
HLB value 2.1.
2. the well thin oil that is used for according to claim 1 is thickened profile control agent, it is by dehydration thin oil composition, thickening agent composition and auxiliary agent
Composition is constituted, wherein calculated in weight percent, dehydration thin oil composition accounts for 82%-97%, and thickening agent composition accounts for 2.5%-15%,
Auxiliary agent composition accounts for 0.5%-3%.
3. the well thin oil that is used for according to claim 1 is thickened profile control agent, it is by dehydration thin oil composition, thickening agent composition and auxiliary agent
Composition is constituted, wherein calculated in weight percent, dehydration thin oil composition accounts for 97%, and thickening agent composition accounts for 2.5%, and auxiliary agent composition is accounted for
0.5%.
4. prepare claim 1-3 any method that profile control agent is thickened for well thin oil, it is characterised in that this is used for
Well thin oil thickening profile control agent is made up of dehydration thin oil, thickening agent and auxiliary agent, and three mixes on ground to be obtained being used for water
Well thin oil is thickened profile control agent.
5. the method according to claim 4, it is characterised in that it comprises the following steps：
The first step, tests the moisture content and viscosity of dewatered oil under 50 DEG C, normal pressure, and when moisture content is less than 1%, viscosity is less than
After 50mPas, it is defined as the profile control agent dewatered oil；
Second step, under normal temperature, normal pressure, adds thickening agent, auxiliary agent, with 100 revs/min of speed into above-mentioned dewatered oil successively
Degree stirring 1 hour, is well mixed it, obtains thin oil thickening profile control agent.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4130165A (en) * | 1977-01-17 | 1978-12-19 | Standard Oil Company (Indiana) | Method for selectively plugging water zones |
| US4817720A (en) * | 1987-12-18 | 1989-04-04 | Texaco Inc. | Method for forming a barrier to fluid flow in an oil formation adjacent to a producing oil well |
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