CN108343398A - A kind of method of oil well antiscale - Google Patents
A kind of method of oil well antiscale Download PDFInfo
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- CN108343398A CN108343398A CN201711204951.0A CN201711204951A CN108343398A CN 108343398 A CN108343398 A CN 108343398A CN 201711204951 A CN201711204951 A CN 201711204951A CN 108343398 A CN108343398 A CN 108343398A
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- water
- well
- fluid
- oil well
- near wellbore
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
Abstract
The invention discloses a kind of methods of oil well antiscale, belong to field of oilfield exploitation.The method includes：Flushing fluid is injected into the casing of target oil well, carries out well-flushing；After waiting for well-flushing, prepad fluid is injected to the near wellbore formation of the target oil well by casing, to clean the gas channel of near wellbore formation；After the completion of waiting for gas channel cleaning, antiscaling fluid and after pad, and closing well preset time are injected near wellbore formation by casing successively, to realize the antiscale near wellbore formation；It drives a well and target oil well is exploited, to carry the scale preventative in antiscaling fluid to the pit shaft of target oil well using Produced Liquid, realize the antiscale to pit shaft；Antiscaling fluid includes water and scale preventative, and a concentration of 40kg/ side water~70kg/ side water of the scale preventative in antiscaling fluid；Scale preventative includes following components in percentage by weight：Imidazoline 20%~30%, Sodium Polyacrylate 40%~60%, kaolinite 3%~5%, surplus are water.Method provided by the invention can carry out effective antiscale to the near wellbore formation and pit shaft of oil well.
Description
Technical field
The present invention relates to field of oilfield exploitation, more particularly to a kind of method of oil well antiscale.
Background technology
In oil extraction process, due to the variation of crude oil property and manufacturing parameter, the near wellbore formation of oil well, pit shaft and
The easy fouling of facility in well, this can not only damage oil reservoir, reduce production capacity, but also can increase the upkeep operation frequency of oil well
Rate.Therefore, it is necessary to a kind of method of oil well antiscale is provided, facility knot in the near wellbore formation, pit shaft and well to prevent oil well
Dirt.
The prior art provides a kind of method of drop antiscale, and this method is：It is connected to pit shaft in well mouth of oil well installation
Chemicals dosing plant, the antiscaling fluid in chemicals dosing plant by its own gravity and is entered in the form of dropwise addition in pit shaft, and passes through pit shaft
It enters near wellbore formation, can thus play anti-scaling action to facility in the near wellbore formation, pit shaft and well of oil well.
In the implementation of the present invention, the inventor finds that the existing technology has at least the following problems：
If oil well is inclined shaft, then when antiscaling fluid relies on its own gravity vertical drop in pit shaft, antiscaling fluid can be with liquid
The form of drop is hung on the sloping portion of well bore wall, and very least a portion of antiscaling fluid is made to enter near wellbore formation, therefore cannot be to close
Effective anti-scaling action is played on well stratum, causes the oil well underproduction.
Invention content
An embodiment of the present invention provides a kind of methods of oil well antiscale, can solve the above problems.The technical solution is as follows：
A kind of method of oil well antiscale, the method includes：
Flushing fluid is injected into the casing of target oil well, carries out well-flushing；
After waiting for well-flushing, prepad fluid is injected to the near wellbore formation of the target oil well by described sleeve pipe, to clean
State the gas channel of near wellbore formation；
After the completion of waiting for the gas channel cleaning, antiscaling fluid is injected with after to the near wellbore formation by described sleeve pipe successively
Liquid, and closing well preset time are set, to realize the antiscale to the near wellbore formation；
Drive a well and the target oil well exploited, with using Produced Liquid by the scale preventative in the antiscaling fluid carry to
In the pit shaft of the target oil well, the antiscale to the pit shaft is realized；
The after pad is used to block the scale preventative in the gas channel；
The antiscaling fluid includes water and scale preventative, and a concentration of 40kg/ side water of the scale preventative in the antiscaling fluid
~the side 70kg/ water；
The scale preventative includes following components in percentage by weight：Imidazoline 20%~30%, Sodium Polyacrylate 40%~
60%, kaolinite 3%~5%, surplus is water.
In a kind of possible design, the flushing fluid of the side of 15 sides~18 is injected per 1000m well depths.
In a kind of possible design, the discharge capacity that well-flushing is carried out to the target oil well is set as 4.5 sides/hour~10
Side/hour.
In a kind of possible design, the injected slurry volume of the prepad fluid is the side of 1.5 sides~2.5.
In a kind of possible design, the prepad fluid includes anti-clayswelling agent, potassium chloride, demulsifier and water；
A concentration of 4.5kg/ side water~5.5kg/ side water of the anti-clayswelling agent in the prepad fluid, the potassium chloride
A concentration of side's the 2.5kg/ water~side's 3.5kg/ water in the prepad fluid, the demulsifier are a concentration of in the prepad fluid
The side's the 11.5kg/ water~side's 12.5kg/ water.
In a kind of possible design, the scale preventative include following components in percentage by weight imidazoline 19%~
21%, Sodium Polyacrylate 40%~41%, kaolinite 3.0%~3.1%, surplus is water.
In a kind of possible design, the scale preventative include following components in percentage by weight imidazoline 29%~
30%, Sodium Polyacrylate 49%~51%, kaolinite 4.9%~5.0%, surplus is water.
In a kind of possible design, the injected slurry volume of the antiscaling fluid is the side of 5 sides~10.
In a kind of possible design, the injected slurry volume of the after pad is the side of 1.5 sides~2.5.
In a kind of possible design, the after pad includes：Anti-clayswelling agent, potassium chloride, demulsifier, water shutoff agent with
Water；
The anti-clayswelling agent sets a concentration of side's the 4.5kg/ water~side's 5.5kg/ water in liquid, the potassium chloride in the rear
A concentration of side's the 3.5kg/ water~side's 4.5kg/ water in liquid is set in the rear, and the demulsifier is set a concentration of in liquid in the rear
The side's the 7.5kg/ water~side's 9.5kg/ water, the water shutoff agent set a concentration of side's 4.5kg/ water~side 5.5kg/ in liquid in the rear
Water.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：
The method of oil well antiscale provided in an embodiment of the present invention, by the way that scale preventative to be blocked to the gas channel near wellbore formation
It is interior, near wellbore formation fouling can be not only prevented, but also can be carried to pit shaft by underground fluid, and then pit shaft and well can be prevented
Interior facility fouling is by gravity and to be entered in pit shaft in the form of dropwise addition different from antiscaling fluid in the prior art, can kept away
Exempt from the sloping portion that antiscaling fluid hangs over inclines wall, therefore effective antiscale can be carried out near wellbore formation and pit shaft.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention will be made into one below
Step ground detailed description.
An embodiment of the present invention provides a kind of method of oil well antiscale, this method includes：
Step 101 injects flushing fluid into the casing of target oil well, carries out well-flushing.
Step 102 after waiting for well-flushing, injects prepad fluid to the near wellbore formation of target oil well by casing, cleans nearly well
The gas channel on stratum.
Step 103 after the completion of waiting for gas channel cleaning, injects antiscaling fluid and postposition near wellbore formation successively by casing
Liquid, to realize the antiscale near wellbore formation；
Step 104 drives a well and is exploited to target oil well, with using Produced Liquid by the scale preventative in antiscaling fluid carry to
In the pit shaft of target oil well, the antiscale to pit shaft is realized；.
Wherein, after pad is used to block scale preventative in gas channel；Antiscaling fluid includes water and scale preventative, and scale preventative
A concentration of side's the 40kg/ water~side's 70kg/ water in antiscaling fluid；Scale preventative includes following components in percentage by weight：Imidazoline
20%~30%, Sodium Polyacrylate 40%~60%, kaolinite 3%~5%, surplus is water.
How it is below to being set in the near wellbore formation, pit shaft and well of target oil well with regard to method provided in an embodiment of the present invention
It applies and carries out being described for antiscale.
In the gas channel for first entering near wellbore formation in physical absorption form or in a manner of forming precipitation due to scale preventative,
After pad is utilized later and then is blocked in the gas channel of near wellbore formation.When target oil mining produces, underground fluid is (i.e.
Oil well produced liquid) gas channel that the near wellbore formation can be passed through, block scale preventative in the gas channel by slow release simultaneously
It is dissolved in underground fluid；The scale preventative of a portion is acted on near wellbore formation, prevents the harmful components in underground fluid from causing
Near wellbore formation fouling, and the scale preventative of another part will be carried by underground fluid to pit shaft, and with set in the pit shaft and well
Use is applied, prevents the harmful components in underground fluid from causing facility fouling in pit shaft and well.Therefore it is provided in an embodiment of the present invention
Method can not only effectively prevent facility fouling in pit shaft and well, but also can effectively prevent near wellbore formation fouling.
Wherein, it is anti-can to form firm surface on metal surface and the surface of near wellbore formation for the imidazoline in scale preventative
Film is answered, corrosive medium is isolated, therefore underground equipment, pit shaft and near wellbore formation fouling can be prevented；Sodium Polyacrylate is due to containing sodium
Ion makes it have larger adsorption capacity, and Sodium Polyacrylate is acid solution, can be acted on carbanion and generate water
And carbon dioxide, the join probability of scale-forming ion is reduced, and then can antiscale；Kaolinite has good compatibility near wellbore formation,
Can be improved scale preventative near wellbore formation adsorption capacity.As it can be seen that scale preventative used in the embodiment of the present invention, it can not only be securely
It is adsorbed near wellbore formation, and can effectively prevent that fouling is arranged near wellbore formation, pit shaft and well.
The method of oil well antiscale provided in an embodiment of the present invention, by the way that scale preventative to be blocked to the gas channel near wellbore formation
It is interior, near wellbore formation fouling can be not only prevented, but also can be carried to pit shaft by underground fluid, and then pit shaft and well can be prevented
Interior facility fouling is by gravity and to be entered in pit shaft in the form of dropwise addition different from antiscaling fluid in the prior art, can kept away
Exempt from the sloping portion that antiscaling fluid hangs over inclines wall, therefore effective antiscale can be carried out near wellbore formation and pit shaft.
Each step of the method for oil well antiscale provided in an embodiment of the present invention is illustrated below：
In a step 101, flushing fluid is injected into the casing of target oil well, carries out well-flushing.
The purpose of the step is carried out to the pit shaft of target oil well using the crude oil and impurity in flushing fluid removal pit shaft
Pretreatment.The step carries out multiple reacting cycle well-flushing specifically, inject flushing fluid into the casing of target oil well, until by well
Crude oil and impurity in cylinder effectively remove.
Wherein, three injection rate of flushing fluid, duration of well flushing, type factors influence well washing effects, below to these three
Factor is described one by one：
In terms of injection rate, if the injection rate of flushing fluid is very little, the crude oil and impurity in pit shaft cannot be removed effectively；
And too much, the waste of flushing fluid can be caused, the cost of oil well antiscale is increased.For this problem, the embodiment of the present invention
In, the injected slurry volume of flushing fluid is arranged according to the well depth of target oil well, (is lifted specifically, injecting the side of 15 sides~18 per 1000m well depths
Example for, may be configured as 15 sides, 16 sides, 17 sides, 18 sides etc.) flushing fluid.
It should be noted that 1 side is equal to 1000 liters.
In terms of duration of well flushing, when in order to effectively remove crude oil in pit shaft and impurity and reduce operation
Between, in the embodiment of the present invention, well-flushing discharge capacity is carried out to target oil well and is set as 4.5 sides/hour~10 sides/hour, citing comes
It says, well-flushing discharge capacity may be configured as 4.5 sides/hour, 5.6 sides/hour, 6.7 sides/hour, 7.8 sides/hour, 8.9 sides/hour, 10
Side/hour etc.).
In terms of flushing fluid type, the flushing fluid for removing crude oil and impurity in pit shaft can be set to multiple types
Type, for example, the flushing fluid in the embodiment of the present invention may be configured as enzyme solutions (for example, the life of surfactant biology
Object enzyme solutions may be configured as the BERO that remarkable Oil Tech Inc is producedTMEnzyme), such well-flushing solution can not only effectively remove well
Cylinder in crude oil and impurity, and if be trapped in pit shaft because of misoperation, pit shaft will not be damaged.Its
In, the concentration of biological enzyme may be configured as the side's the 0.2L/ water~side's 0.3L/ water in biological enzyme solutions, for example, the concentration can be arranged
For the side's 0.21L/ water, the side's 0.22L/ water, the side's 0.23L/ water, the side's 0.24L/ water, the side's 0.25L/ water, the side's 0.26L/ water, the side 0.27L/
Water, the side's 0.28L/ water, the side's 0.29L/ water, the side's 0.3L/ water etc..
It should be noted that the concentration of above-mentioned biological enzyme refers to the liter number of every 1 side organism in water enzyme.
In a step 102, after waiting for well-flushing, prepad fluid is injected to the near wellbore formation of target oil well by casing, with clear
Wash the gas channel of near wellbore formation.
In target oil well production process, it is generally filled with toughness in the gas channel of near wellbore formation and blocks up object, the viscosity is stifled
Object reduces the aperture of gas channel, and can cause operation pressure high if gas channel is small, is unfavorable for antiscaling fluid being injected into
In the gas channel of near wellbore formation.Therefore, before injecting antiscaling fluid, prepad fluid can be injected near wellbore formation, it is close to clean
Well stratum is exactly gas channel.
In order to can effectively remove the stifled object of the viscosity in gas channel and the waste of prepad fluid, the present invention be caused to implement
In example, the injected slurry volume of prepad fluid is the side of 1.5 sides~2.5, for example, the injected slurry volume of prepad fluid may be configured as 1.5 sides,
1.6 sides, 1.7 sides, 1.8 sides, 1.9 sides, 2.0 sides, 2.1 sides, 2.2 sides, 2.3 sides, 2.4 sides, 2.5 sides etc..
The prepad fluid that can be used for removing the stifled object of the viscosity in gas channel can be set to multiple types, for example, this hair
In bright embodiment, which includes anti-clayswelling agent, potassium chloride, demulsifier and water；Anti-clayswelling agent is dense in prepad fluid
Degree is that the side's the 4.5kg/ water~side's 5.5kg/ water (for example, can be set to the side's 4.5kg/ water, the side's 4.7kg/ water, the side 4.9kg/
Water, the side's 5.1kg/ water, the side's 5.3kg/ water, the side's 5.5kg/ water etc.), a concentration of 2.5kg/ side water of the potassium chloride in prepad fluid~
The side's 3.5kg/ water (for example, can be set to the side's 2.5kg/ water, the side's 2.7kg/ water, the side's 2.9kg/ water, the side's 3.1kg/ water,
The side's 3.3kg/ water, the side's 3.5kg/ water etc.), a concentration of 11.5kg/ side water~12.5kg/ side water of the demulsifier in prepad fluid (is lifted
Example for, can be set to the side's 11.5kg/ water, the side's 11.7kg/ water, the side's 11.9kg/ water, the side's 12.1kg/ water, the side's 12.3kg/ water,
The side's 12.5kg/ water etc.).
It is understood that the solute of above-mentioned prepad fluid is anti-clayswelling agent, potassium chloride, demulsifier, solvent is water.Its
In, anti-clayswelling agent can protect the knot of near wellbore formation for preventing foreign substance from being damaged to the ground mineral of near wellbore formation
It structure and avoids polluting near wellbore formation, which may be configured as organic small cation or potassium chloride；Demulsifier
For more preferably detaching the grease in production fluid, the stifled object of near wellbore formation can be effectively removed, which may be configured as polycyclic oxygen
Ethane or polypropylene oxide.
In addition, in order to effectively clean the gas channel of near wellbore formation, it is preposition being injected to the near wellbore formation of target oil well
After liquid, after the viscosity in the prepad fluid and gas channel blocks up object effect 5min~10min, it can think that gas channel has cleaned
At.
In step 103, after the completion of waiting for gas channel cleaning, antiscaling fluid is injected with after near wellbore formation by casing successively
Liquid, and closing well preset time are set, to realize the antiscale near wellbore formation.
It should be noted that the antiscaling fluid and after pad in the step 103 are to be injected into target oil well according to sequencing
Near wellbore formation, and after antiscaling fluid all injects stratum, after pad should be injected near wellbore formation immediately.
Based on the above-mentioned description to scale preventative ingredient, it is known that the Sodium Polyacrylate and kaolinite of scale preventative can improve anti-
Adsorption capacity of the dirty agent in the gas channel of near wellbore formation.
Wherein, the molecular structural formula of Sodium Polyacrylate isN in the molecular structural formula can value be 22
~32, for example, the value of the n may be configured as 22,24,26,28,30,32 etc..Since the synthetic method of Sodium Polyacrylate is this
Known to field, the synthetic method is not illustrated herein.
It should be noted that kaolinite is the clay mineral in a kind of common rock located underground, main component is
Feldspar and silicate mineral have the function of anti-swollen.Therefore, kaolinic ingredient is clear for a person skilled in the art.
Ingredient about scale preventative is arranged, and the embodiment of the present invention is provided with two kinds of realization methods：
In the first realization method, scale preventative includes following components in percentage by weight：Imidazoline 19%~21%,
Sodium Polyacrylate 40%~41%, kaolinite 3.0%~3.1%, surplus are water.
In second of realization method, scale preventative includes following components in percentage by weight：Imidazoline 29%~30%,
Sodium Polyacrylate 49%~51%, kaolinite 4.9%~5.0%, surplus are water.
It is adsorbed with scale preventative in gas channel in order to not only can guarantee near wellbore formation, but also does not cause the waste of scale preventative,
In embodiments of the present invention, the injected slurry volume of antiscaling fluid is the side of 5 sides~10, for example, its injected slurry volume may be configured as 5 sides, 6
Side, 7 sides, 8 sides, 9 sides, 10 sides etc..
The description of principle based on the above-mentioned method to the oil well antiscale, it is known that after pad, which has, blocks scale preventative in oil
Effect in gas channel, principle can be described as：After pad provides adhesion strength to scale preventative so that scale preventative is solid using the adhesion strength
It is scheduled on the gas channel wall of near wellbore formation.Wherein, the injected slurry volume of after pad and type influence to block scale preventative
Effect in gas channel below illustrates the injected slurry volume of after pad and type one by one.
About the injected slurry volume of after pad, in order to can effectively scale preventative be blocked in gas channel and be caused
The waste of after pad, in the embodiment of the present invention, the injected slurry volume of after pad is the side of 1.5 sides~2.5, for example, after pad
Injected slurry volume may be configured as 1.5 sides, 1.6 sides, 1.7 sides, 1.8 sides, 1.9 sides, 2.0 sides, 2.1 sides, 2.2 sides, 2.3 sides, 2.4 sides,
2.5 sides etc..
It can be used for scale preventative blocking the after pad in gas channel and can be set to multiple types, for example, this hair
In bright embodiment, which includes anti-clayswelling agent, potassium chloride, demulsifier, water shutoff agent and water；Anti-clayswelling agent is in after pad
In a concentration of side's the 4.5kg/ water~side's 5.5kg/ water (for example, can be set to the side's 4.5kg/ water, the side's 4.7kg/ water,
The side's 4.9kg/ water, the side's 5.1kg/ water, the side's 5.3kg/ water, the side's 5.5kg/ water etc.), a concentration of 3.5kg/ of the potassium chloride in after pad
Fang Shui~the side's 4.5kg/ water (for example, can be set to the side's 3.5kg/ water, the side's 3.7kg/ water, the side's 3.9kg/ water, the side 4.1kg/
Water, the side's 4.3kg/ water, the side's 4.5kg/ water etc.), a concentration of 7.5kg/ side water~9.5kg/ side water of the demulsifier in after pad (is lifted
For example, the side's 7.5kg/ water, the side's 8.0kg/ water, the side's 8.5kg/ water, the side's 9.0kg/ water, the side's 9.5kg/ water etc. can be set to), it blocks up
Aqua in after pad a concentration of side's the 4.5kg/ water~side's 5.5kg/ water (for example, can be set to the side's 4.5kg/ water,
The side's 4.7kg/ water, the side's 4.9kg/ water, the side's 5.1kg/ water, the side's 5.3kg/ water, the side's 5.5kg/ water etc.).
It is understood that the solute of above-mentioned after pad is expansion-resisting agent, potassium chloride, demulsifier and water shutoff agent, solvent is
Water.Wherein, anti-clayswelling agent can protect near wellbore formation for preventing foreign substance from being damaged to the ground mineral of near wellbore formation
Structure and avoid polluting near wellbore formation, which may be configured as organic small cation；Demulsifier is used for
Grease in production fluid is more preferably detached, the stifled object of near wellbore formation can be effectively removed, which may be configured as polyethylene oxide
Or polypropylene oxide；The water shutoff agent is used to block scale preventative in gas channel, which can be to be set as poly- propionamide.
Scale preventative is blocked into the effect in gas channel in order to improve after pad, after pad can be made abundant with scale preventative
Effect, and does not extend the activity duration, in embodiments of the present invention, after having injected after pad to target oil well, and closing well 4 days~
6 days, for example, can closing well 4 days, 5 days, 6 days etc..
It should be noted that the water used in flushing fluid, prepad fluid, antiscaling fluid and after pad may be derived from stratum extraction
Water (temperature is 40 DEG C~50 DEG C), is on the one hand to the temperature close near wellbore formation, if differing greatly, can cause to hinder to stratum
Evil；On the other hand, be convenient for well-flushing, the temperature of stratum recovered water can effective temperatureization crude oil, improve the performance of flushing fluid.
In addition, injecting flushing fluid, prepad fluid, antiscaling fluid and during after pad into casing, in order to reduce by
External working fluid is carried to the oxidizing component of near wellbore formation and aerophile bacteria, can be added in above-mentioned each liquid a certain amount of
Deoxidier, the addition volume of the deoxidier is that 0.1 liter~0.3 liter is added in the above-mentioned each liquid of every 1 side.
At step 104, it drives a well and target oil well is exploited, to be taken the scale preventative in antiscaling fluid using Produced Liquid
In band to the pit shaft of target oil well, the antiscale to pit shaft is realized.
The purpose of the step is carried the scale preventative blocked in gas channel to pit shaft, Jin Erke using underground fluid
Play the role of antiscale to facility in pit shaft and well.
It is sampled the concentration that monitoring scale preventative is brought out in process of production, and then determines scale preventative service life.
The alternative embodiment that any combination forms the disclosure may be used, herein no longer in above-mentioned all optional technical solutions
It repeats one by one.
The present invention will be further described through by specific embodiment below.
In following specific examples, condition person is not specified in involved operation, according to normal condition or manufacturer
It is recommended that condition carry out.It is raw materials used be not specified production firm and specification person be can be with conventional products that are commercially available.
Wherein, imidazoline is purchased from Tianjin Xin Xiang oil gas Technology Co., Ltd.；Organic small cation ammonium salt class is new purchased from Tianjin
Xiang oil gas Technology Co., Ltd.；The emulsifier of HR-9 types is purchased from Hebei North China oil day at Industry Group Co., Ltd；Phenolic aldehyde
Resin cross-linking agent is purchased from Xin Shuntong Chemical Co., Ltd.s of Xinji City；And Sodium Polyacrylate is prepared by laboratory and is obtained, wherein poly- third
N values in the molecular structural formula of olefin(e) acid sodium are 26.
Embodiment 1
A kind of method of oil well antiscale is present embodiments provided, this method includes：Life is injected into the casing of target oil well
Object enzyme concentration is that the surfactant biology enzyme solutions of the side's 0.2L/ water carry out well-flushing.Wherein, inject 16 sides' per 1000m well depths
Flushing fluid, and the well depth of the target oil well is 1500m；Well-flushing discharge capacity is 5 sides/hour.
The prepad fluid for injecting 2 sides to the near wellbore formation of target oil well by casing, cleans the gas channel of near wellbore formation.Its
In, prepad fluid includes the demulsifier and water of the anti-clayswelling agent of organic small cation ammonium salt class, potassium chloride, HR-9 types；And it is viscous
A concentration of side's 4.5kg/ water of native expansion-resisting agent, a concentration of side's 2.5kg/ water of potassium chloride, a concentration of side 11.5kg/ of demulsifier
Water.After 20min, it is believed that washing and cleaning operation is completed in gas channel.
The antiscaling fluid of 6 sides, a concentration of side 40kg/ of scale preventative wherein in antiscaling fluid are injected near wellbore formation by casing
Water, and scale preventative includes following components in percentage by weight：Imidazoline 20%, Sodium Polyacrylate 40%, kaolinite 3%, surplus
For water.
The after pad of 1.5 sides is injected near wellbore formation by casing, wherein after pad includes organic small cation ammonium salt class
Anti-clayswelling agent, potassium chloride, the demulsifier of HR-9 types, phenolic resin crosslinking agent and the water of type.And the concentration of anti-clayswelling agent
For the side's 4.5kg/ water, a concentration of side's 3.5kg/ water of potassium chloride, a concentration of side's 7.5kg/ water of demulsifier, water shutoff agent it is a concentration of
The side's 4.5kg/ water.
Closing well 4 days drives a well and is exploited to target oil well later.
Embodiment 2
A kind of method of oil well antiscale is present embodiments provided, this method includes：Life is injected into the casing of target oil well
Object enzyme concentration is that the surfactant biology enzyme solutions of the side's 0.3L/ water carry out well-flushing.Wherein, inject 18 sides' per 1000m well depths
Flushing fluid, and the well depth of the target oil well is 1200m；Well-flushing discharge capacity is 7 sides/hour.
The prepad fluid for injecting 2.5 sides to the near wellbore formation of target oil well by casing, cleans the gas channel of near wellbore formation.
Wherein, prepad fluid includes the demulsifier and water of the anti-clayswelling agent of organic small cation ammonium salt class, potassium chloride, HR-9 types；And
A concentration of side's 5kg/ water of anti-clayswelling agent, a concentration of side's 3kg/ water of potassium chloride, a concentration of side's 12kg/ water of demulsifier.It waits for
After 30min, it is believed that washing and cleaning operation is completed in gas channel.
The antiscaling fluid of 9 sides, a concentration of side 60kg/ of scale preventative wherein in antiscaling fluid are injected near wellbore formation by casing
Water and scale preventative include following components in percentage by weight：Imidazoline 30%, Sodium Polyacrylate 50%, kaolinite 5%, surplus are
Water.
The after pad of 2 sides is injected near wellbore formation by casing, wherein after pad includes organic small cation ammonium salt type
Anti-clayswelling agent, potassium chloride, the demulsifier of HR-9 types, phenolic resin crosslinking agent and water.And anti-clayswelling agent is a concentration of
The side's 5kg/ water, a concentration of side's 4kg/ water of potassium chloride, a concentration of side's 9kg/ water of demulsifier, a concentration of side 5kg/ of water shutoff agent
Water.
Closing well 6 days drives a well and is exploited to target oil well later.
The foregoing is merely presently preferred embodiments of the present invention, the protection domain being not intended to limit the invention, all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.
Claims (10)
1. a kind of method of oil well antiscale, which is characterized in that the method includes：
Flushing fluid is injected into the casing of target oil well, carries out well-flushing；
After waiting for well-flushing, prepad fluid is injected to the near wellbore formation of the target oil well by described sleeve pipe, it is described close to clean
The gas channel on well stratum；
After the completion of waiting for the gas channel cleaning, antiscaling fluid and postposition are injected to the near wellbore formation by described sleeve pipe successively
Liquid, and closing well preset time, to realize the antiscale to the near wellbore formation；
It drives a well and the target oil well is exploited, to be carried the scale preventative in the antiscaling fluid to described using Produced Liquid
In the pit shaft of target oil well, the antiscale to the pit shaft is realized；
The after pad is used to block the scale preventative in the gas channel；
The antiscaling fluid includes water and scale preventative, and a concentration of 40kg/ side water of the scale preventative in the antiscaling fluid~
The side's 70kg/ water；
The scale preventative includes following components in percentage by weight：Imidazoline 20%~30%, Sodium Polyacrylate 40%~60%,
Kaolinite 3%~5%, surplus are water.
2. according to the method described in claim 1, it is characterized in that, injecting the well-flushing of the side of 15 sides~18 per 1000m well depths
Liquid.
3. according to the method described in claim 1, it is characterized in that, the discharge capacity for carrying out well-flushing to the target oil well is set as
4.5 sides/hour~10 sides/hour.
4. according to the method described in claim 1, it is characterized in that, the injected slurry volume of the prepad fluid is the side of 1.5 sides~2.5.
5. according to the method described in claim 1, it is characterized in that, the prepad fluid includes anti-clayswelling agent, potassium chloride, demulsification
Agent and water；
A concentration of 4.5kg/ side water~5.5kg/ side water of the anti-clayswelling agent in the prepad fluid, the potassium chloride is in institute
A concentration of side's the 2.5kg/ water~side's 3.5kg/ water in prepad fluid is stated, the demulsifier is a concentration of in the prepad fluid
The side's the 11.5kg/ water~side's 12.5kg/ water.
6. according to the method described in claim 1, it is characterized in that, the scale preventative includes following components in percentage by weight：
Imidazoline 19%~21%, Sodium Polyacrylate 40%~41%, kaolinite 3.0%~3.1%, surplus are water.
7. according to the method described in claim 1, it is characterized in that, the scale preventative includes following components in percentage by weight：
Imidazoline 29%~30%, Sodium Polyacrylate 49%~51%, kaolinite 4.9%~5.0%, surplus are water.
8. according to the method described in claim 1, it is characterized in that, the injected slurry volume of the antiscaling fluid is the side of 5 sides~10.
9. according to the method described in claim 1, it is characterized in that, the injected slurry volume of the after pad is the side of 1.5 sides~2.5.
10. according to the method described in claim 1, it is characterized in that, the after pad includes：Anti-clayswelling agent, is broken potassium chloride
Emulsion, water shutoff agent and water；
The anti-clayswelling agent sets a concentration of side's the 4.5kg/ water~side's 5.5kg/ water in liquid in the rear, and the potassium chloride is in institute
A concentration of side's the 3.5kg/ water~side's 4.5kg/ water in after pad is stated, the demulsifier is set a concentration of in liquid in the rear
The side's the 7.5kg/ water~side's 9.5kg/ water, the water shutoff agent set a concentration of side's 4.5kg/ water~side 5.5kg/ in liquid in the rear
Water.
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