CN109897618A - A kind of descaling composition, scale remover and preparation method thereof - Google Patents
A kind of descaling composition, scale remover and preparation method thereof Download PDFInfo
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- CN109897618A CN109897618A CN201711286014.4A CN201711286014A CN109897618A CN 109897618 A CN109897618 A CN 109897618A CN 201711286014 A CN201711286014 A CN 201711286014A CN 109897618 A CN109897618 A CN 109897618A
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Abstract
The present invention relates to a kind of descaling compositions, scale remover and preparation method thereof, belong to gas field development field.Descaling composition of the invention is grouped as by the group of following mass fraction: 7.5~15 parts of hydrochloric acid, 2~5 parts of citric acid, 2.5~5 parts of EDTA, 0.25~0.5 part of metal inhibitor, 1~2 part of cleanup additive, Xie Shui locks 2~4 parts of agent.Descaling composition of the invention, when use, mix with water, and application method is simple, and scale removal is had excellent performance, and corrosivity is small, and application prospect is good.
Description
Technical field
The present invention relates to a kind of descaling compositions, scale remover and preparation method thereof, belong to gas field development field.
Background technique
During gas well development and production, water flooding is converged by reservoir to shaft bottom, is lifted together by by flow string with natural gas
Surface gathering system is risen to, in entire flow process, the environmental conditions such as pressure, temperature of fluid constantly change, the change of condition
Original formation fluid ionic equilibrium state has been broken in change, generates scale formation.This scale formation is generally existing, near wellbore
Formation pore throat in and tubing wall on, dirty body depositional phenomenon is particularly evident.Tube inner wall fouling, on the one hand reduces flow-passing surface
Product increases fluid flow resistance, leads to the reduction of gas well liquid carry over, influences gas well yield release；The serious gas of another aspect fouling
Well, a large amount of dirts of tube wall attachment, cause the test equipments such as pressure can not tripping in, to influence the formulation of gas well liquid loading system, simultaneously
Influence gas field capability forecasting.It is therefore desirable to be removed to Wellbore of Gas Wells dirt sample.
It mainly include at present physical method, Mechanical Method and chemical method to the method for Wellbore of Gas Wells scale removal.Physics descaling method is main
Including high-strength sound machine wave descaling method, high-pressure water jet descaling method, electric pulse descaling method and cavitation jet cleaning technique etc.；Traditional
Mechanical descaling's technology refers to drives milling cutter or other similar cutting elements to rotate using turntable or screw drill, applies to system wall
Add a power, bores the dirt gone on wall；Physical method and Mechanical Method construction are required to the equipment, at high cost of profession, and site operation
Complexity is high to personnel, site requirements.Chemical method scale removal refer to the scale removed with some chemicals in stratum or equipment,
The method of the objects such as greasy dirt, sludge and corrosion product has the characteristics that scale removal is high-efficient, scale removal range is wide low with labor intensity.It is main
The chemical cleaning cleaning agent wanted has acidic descaling agent, complexing scale remover, organic complexing agent etc., is selected according to fouling components difference suitable
The reagent combination of conjunction.
Application publication number is that the Chinese invention patent of CN 101747881A discloses a kind of descaling and blockage relieving agent for oil-water well, should
The descaling and blockage relieving agent for oil-water well of patent disclosure is grouped as by the group of following volumes percentage: Compound-acid 24~55%, surface-active
Agent 3.3~10.3%, complexing agent 1.5~4%, organic solvent 1~6%, enzyme preparation 0.1~0.3%, the Compound-acid are salt
Two or more in acid, acetic acid, hydrofluoric acid, citric acid, sulfamic acid and polymaleic anhydride, the de-plugging agent ingredient are multiple
It is miscellaneous, and its scale removal performance still needs to be further increased.
Summary of the invention
The purpose of the present invention is to provide a kind of descaling compositions, mixed with water when which uses as scale remover
Conjunction, and scale-inhibiting properties are good.
Second object of the present invention is to provide the scale remover that a kind of scale removal is had excellent performance and corrosivity is small.
Third object of the present invention is to provide a kind of preparation method of above-mentioned scale remover.
To achieve the above object, the technical scheme is that
A kind of descaling composition is grouped as by the group of following mass fraction: 7.5~15 parts of hydrochloric acid, 2~5 parts of citric acid,
2.5~5 parts of EDTA, 0.25~0.5 part of metal inhibitor, 1~2 part of cleanup additive, Xie Shui locks 2~4 parts of agent.
Hydrochloric acid, citric acid compounding can quickly be dissolved removing attachment as scale removal host agent by descaling composition of the invention
The dirty body (the dirty sample of 70% or more carbonate mass fraction) based on carbonate on gas well liquid loading tubing string, citric acid conduct
A kind of organic acid can be used as buffer, mitigates hydrochloric acid and acts on corrosion of metal, complexed metal corrosion inhibiter can be reduced greatly
Corrosion of this descaling composition to metal tubing string, EDTA, can be with dissolved Mg as a kind of chelating agent2+、Ca2+Deng formation
Stable chelate prevents secondary precipitation, and cleanup additive can reduce the surface and interface tension of descaling composition, conducive to raffinate after scale removal
The row of returning makes gas well quickly resume production, and Xie Shui lock agent can mitigate the liquid phase injury of gas well liquid loading layer, protects reservoir.
Above-mentioned hydrochloric acid is the hydrochloric acid solution that mass fraction is 36%.
The metal inhibitor be imidazoline quaternary ammonium salt, alkyl imidazoline, in bi-imidazoline quaternary ammonium salt any one or
It is several.
Abovementioned alkyl imidazoline is lauryl imidazoline, heptadecyl imidazole quinoline, any one in naphthenic base imidazoline
Kind is several.
The cleanup additive is fluorocarbon surfactant, sulfosalt surfactant, any in nonionic surfactant
It is one or more of.
The fluorocarbon surfactant be YM-312 non-ion fluorin carbon surface active agent, FC-03 fluorocarbon surfactant,
Any one or a few in FSP fluorocarbon surfactant.
Above-mentioned YM-312 non-ion fluorin carbon surface active agent is the production of Shanghai Yu Mu Chemical Co., Ltd..Above-mentioned FC-03
Fluorocarbon surfactant is the production of Shanghai Jian Hong Industrial Co., Ltd..Above-mentioned FSP fluorocarbon surfactant is the silent chemistry of Qingdao section
Co., Ltd's production.
The sulfosalt surfactant is dodecyl sodium sulfate, in sodium cetanesulfonate, sodium methanedisulfonate sodium
Any one or a few.
The nonionic surfactant is alkyl phenol polyoxyethylene ether, any one in hydrogenated castor oil polyoxyethylene ether
Kind is several.
The Xie Shui lock agent is nano silica, biosurfactant, non-ionic fluoropolymers surfactant
In any one or a few.
The biosurfactant is rhamnolipid, sophorolipid, any one or a few in soybean lecithin.
Above-mentioned rhamnolipid is preferably Daqing Vertex Chemical Co., Ltd.'s production；Above-mentioned sophorolipid is preferably that Qingdao is new
The production of Lv Huan Biotechnology Co., Ltd；Above-mentioned soybean lecithin is preferably the production of Tianjin Bo Shuai Biotechnology Co., Ltd.
The non-ionic fluoropolymers surfactant is fluorochemical repellent oil water repellent anti-soil agent.The fluorochemical repellent oil is refused
Water anti-soil agent is the production of Shanghai He Te Industrial Co., Ltd..
A kind of scale remover, consists of the following mass percentage components: hydrochloric acid 7.5%~15%, citric acid 2%~5%,
EDTA 2.5%~5%, metal inhibitor 0.25%~0.5%, cleanup additive 1%~2%, Xie Shui lock agent 2%~4%, surplus
For water.
Scale remover of the invention, it is nontoxic, it is small to equipment corrosion, gas well shaft bottom can be quickly dissolved based on carbonate
Dirty sample (the dirty sample of 70% or more carbonate mass fraction), easily the row of returning, raw material easily obtain, construction is simple, and performance is mild.
Above-mentioned hydrochloric acid is the hydrochloric acid solution that mass fraction is 36%.
The metal inhibitor be imidazoline quaternary ammonium salt, alkyl imidazoline, in bi-imidazoline quaternary ammonium salt any one or
It is several.
Abovementioned alkyl imidazoline is lauryl imidazoline, heptadecyl imidazole quinoline, any one in naphthenic base imidazoline
Kind is several.
The cleanup additive is fluorocarbon surfactant, sulfosalt surfactant, any in nonionic surfactant
It is one or more of.
The fluorocarbon surfactant be YM-312 non-ion fluorin carbon surface active agent, FC-03 fluorocarbon surfactant,
Any one or a few in FSP fluorocarbon surfactant.
Above-mentioned YM-312 non-ion fluorin carbon surface active agent is the production of Shanghai Yu Mu Chemical Co., Ltd..Above-mentioned FC-03
Fluorocarbon surfactant is the production of Shanghai Jian Hong Industrial Co., Ltd..Above-mentioned FSP fluorocarbon surfactant is the silent chemistry of Qingdao section
Co., Ltd's production.
The sulfosalt surfactant is dodecyl sodium sulfate, in sodium cetanesulfonate, sodium methanedisulfonate sodium
Any one or a few.
The nonionic surfactant is alkyl phenol polyoxyethylene ether, any one in hydrogenated castor oil polyoxyethylene ether
Kind is several.
The Xie Shui lock agent is nano silica, biosurfactant, non-ionic fluoropolymers surfactant
In any one or a few.
The biosurfactant is rhamnolipid, sophorolipid, any one or a few in soybean lecithin.
The non-ionic fluoropolymers surfactant is fluorochemical repellent oil water repellent anti-soil agent.The fluorochemical repellent oil is refused
Water anti-soil agent is the production of Shanghai He Te Industrial Co., Ltd..
A kind of preparation method of above-mentioned scale remover, comprising the following steps:
Water, hydrochloric acid, citric acid, EDTA, metal inhibitor, cleanup additive, Xie Shui lock agent are mixed to obtain the final product.
The preparation method of above-mentioned scale remover, it is preferred that first metal will be added after water, hydrochloric acid, citric acid, EDTA mixed dissolution
Corrosion inhibiter, cleanup additive, Xie Shui lock agent, mix to get.
The mode of the mixed dissolution is to stir 10~15min with the rate of 800r/min.
The mode of the mixing is to stir 10~15min with the rate of 1200r/min.
Scale remover of the invention can open the production sieve pore of Gas well blocking molten dirty 95% or more in 2.5 hours, purification
Oil and gas flow channel is dredged near wellbore zone, good with water flooding compatibility, does not generate secondary precipitation, tube corrosion rate at 85 DEG C
Average out to 1.2g/m2H is better than national standard 5g/m2H, and the easily row of returning, efficient scale removal and can injure equipment.
The preparation method of scale remover of the invention, simple possible is at low cost, and each raw material is mixed to obtain the final product, is suitble to batch raw
It produces.
Specific embodiment
Embodiment 1
The descaling composition of the present embodiment is grouped as by the group of following mass fraction: the hydrochloric acid 7.5 that mass fraction is 36%
Part, 3 parts of citric acid, 3 parts of EDTA complexing agent, 0.25 part of imidazoline quaternary ammonium salt, 1 part of YM-312 non-ion fluorin carbon surface active agent,
2 parts of nano silica.
The scale remover of the present embodiment, consists of the following mass percentage components: the hydrochloric acid that mass fraction is 36%
7.5%, citric acid 3%, EDTA complexing agent 3%, imidazoline quaternary ammonium salt 0.25%, YM-312 non-ion fluorin carbon surface active agent
1%, nano silica 2%, surplus is water.
The preparation method of the scale remover of the present embodiment, comprising the following steps:
Water is added in material-compound tank according to above-mentioned mass percent, then sequentially adds hydrochloric acid, citric acid, EDTA complexing agent
And made it dissolve with the rate of 800r/min stirring 10min, then add imidazoline quaternary ammonium salt, YM-312 non-ionic fluorocarbon table
Face activating agent, nano silica, with the rate of 1200r/min stirring 10min to get.
Embodiment 2
The descaling composition of the present embodiment is grouped as by the group of following mass fraction: the hydrochloric acid 10 that mass fraction is 36%
Part, 4 parts of citric acid, 3 parts of EDTA complexing agent, 0.5 part of lauryl imidazoline, 1.5 parts of sodium cetanesulfonate, rhamnolipid 2
Part.
The scale remover of the present embodiment, consists of the following mass percentage components: the hydrochloric acid 10% that mass fraction is 36%,
Citric acid 4%, EDTA complexing agent 3%, lauryl imidazoline 0.5%, sodium cetanesulfonate 1.5%, rhamnolipid 2%,
Surplus is water.
The preparation method of the scale remover of the present embodiment, comprising the following steps:
Water is added in material-compound tank according to above-mentioned mass percent, then sequentially adds hydrochloric acid, citric acid, EDTA complexing agent
And with the rate of 800r/min stirring 10min make it dissolve, then add lauryl imidazoline, sodium cetanesulfonate,
Rhamnolipid, with the rate of 1200r/min stirring 15min to get.
Embodiment 3
The descaling composition of the present embodiment is grouped as by the group of following mass fraction: the hydrochloric acid 15 that mass fraction is 36%
Part, 5 parts of citric acid, 3 parts of EDTA complexing agent, 0.5 part of bi-imidazoline quaternary ammonium salt, 1.5 parts of alkyl phenol polyoxyethylene ether, nonionic contains
2 parts of fluoropolymer surfactant；The non-ionic fluoropolymers surfactant is fluorochemical repellent oil water repellent anti-soil agent.
The scale remover of the present embodiment, consists of the following mass percentage components: the hydrochloric acid 15% that mass fraction is 36%,
Citric acid 5%, EDTA complexing agent 3%, bi-imidazoline quaternary ammonium salt 0.5%, alkyl phenol polyoxyethylene ether 1.5%, nonionic is fluorine-containing
Polymeric surfactant 2%, surplus are water；The non-ionic fluoropolymers surfactant is that fluorochemical repellent oil water repellent is antifouling
Finishing agent.
The preparation method of the scale remover of the present embodiment, comprising the following steps:
Water is added in material-compound tank according to above-mentioned mass percent, then sequentially adds hydrochloric acid, citric acid, EDTA complexing agent
And made it dissolve with the rate of 800r/min stirring 15min, then add bi-imidazoline quaternary ammonium salt, alkylphenol-polyethenoxy
Ether, fluorochemical repellent oil water repellent anti-soil agent, with the rate of 1200r/min stirring 15min to get.
Embodiment 4
The descaling composition of the present embodiment is grouped as by the group of following mass fraction: the hydrochloric acid 10 that mass fraction is 36%
Part, 4 parts of citric acid, 5 parts of EDTA chelating agent, 0.5 part of heptadecyl imidazole quinoline, 1.5 parts of sodium methanedisulfonate sodium, nano silica
1.5 parts, 1.5 parts of soybean lecithin.
The scale remover of the present embodiment, consists of the following mass percentage components: the hydrochloric acid 10% that mass fraction is 36%,
Citric acid 4%, EDTA chelating agent 5%, heptadecyl imidazole quinoline 0.5%, sodium methanedisulfonate sodium 1.5%, nano silica
1.5%, soybean lecithin 1.5%, surplus is water.
The preparation method of the scale remover of the present embodiment, comprising the following steps:
Water is added in material-compound tank according to above-mentioned mass percent, then sequentially adds hydrochloric acid, citric acid, EDTA chelating agent
And made it dissolve with the rate of 800r/min stirring 10min, it then adds heptadecyl imidazole quinoline, sodium methanedisulfonate sodium, receive
Rice silica, soybean lecithin, with the rate of 1200r/min stirring 10min to get.
Experimental example 1
Scale remover in embodiment 1-3 is tested for the property respectively, test method are as follows: 6 wide-mouth bottles is taken to be separately added into
Scale remover 200ml in each embodiment is wherein hanging weighted N80 steel disc standard corrosion coupon respectively, in 80 DEG C of perseverances
Simultaneously timing is placed in tepidarium.After 8 hours, test piece is taken out, is weighed after processing, calculates rate of corrosion, as a result as shown in table 1-3.
The corrosive nature of scale remover in 1 embodiment 1 of table
By 1 content of table it is found that highest rate of corrosion is 3.83g/ (m2H), lower than country and professional standard, show the scale remover
It is small to metal injury, it is safe scale remover.
The corrosive nature of scale remover in 2 embodiment 2 of table
As known from Table 2, highest rate of corrosion is 1.09g/ (m2H), lower than country and professional standard, show the scale remover to gold
It is small to belong to injury, is safe scale remover.
The corrosive nature of scale remover in 3 embodiment 3 of table
Can be seen that highest rate of corrosion from 3 rate of corrosion of table is 1.74g/ (m2H), lower than country and professional standard, show this
Scale remover is small to metal injury, is safe scale remover.
Experimental example 2
Scale remover in embodiment 4 is tested for the property, test method are as follows: 3 beakers is taken to be separately added into embodiment 4
Dry weighted dirty sample is wherein being added respectively in scale remover 100ml, reacts 2.5 hours in 80 DEG C of waters bath with thermostatic control, then mistake
Filter, by the dry weighing of residue, dirty rate is melted in calculating, and the results are shown in Table 4.
Scale remover in 4 embodiment 4 of table melts dirty performance
Melting dirty rate from table 4 can be seen that 3 groups of experiments in 2.5 hours, melts dirty rate and reaches 95% or more, shows that this is removed
Dirty agent melts dirty significant effect to carbonate dirt body, is efficient scale remover.
Production instance
Scale removal test has been carried out in DaNiuDi gas field D1-2-6 well using the scale remover in the embodiment of the present invention 2.Scale remover
It behind injection well bottom, carries out melting dirty reaction within closing well 3 hours, production is asked in the open flow drain that then drives a well, and the interior row of returning, which leads, for 24 hours reaches 86%, is produced
Measure and increase by 7000 sides/day day, and continuously steady production shows outstanding gas well scale removal efficiency, faster raffinate flowback rate and
Preferable reservoir protection effect.
Claims (9)
1. a kind of descaling composition, which is characterized in that be grouped as by the group of following mass fraction: 7.5~15 parts of hydrochloric acid, citric acid
2~5 parts, 2.5~5 parts of EDTA, 0.25~0.5 part of metal inhibitor, 1~2 part of cleanup additive, Xie Shui locks 2~4 parts of agent.
2. a kind of scale remover, which is characterized in that consist of the following mass percentage components: hydrochloric acid 7.5%~15%, citric acid
2%~5%, EDTA 2.5%~5%, metal inhibitor 0.25%~0.5%, cleanup additive 1%~2%, the agent 2% of Xie Shui lock~
4%, surplus is water.
3. scale remover according to claim 2, which is characterized in that the metal inhibitor is imidazoline quaternary ammonium salt, alkyl
Any one or a few in imidazoline, bi-imidazoline quaternary ammonium salt.
4. scale remover according to claim 2, which is characterized in that the cleanup additive is fluorocarbon surfactant, sulfonate
Any one or a few in surfactant, nonionic surfactant.
5. scale remover according to claim 2, which is characterized in that the Xie Shui lock agent is nano silica, biological table
Any one or a few in face activating agent, non-ionic fluoropolymers surfactant.
6. a kind of preparation method of scale remover as claimed in claim 2, which comprises the following steps: Jiang Shui, salt
Acid, citric acid, EDTA, metal inhibitor, cleanup additive, Xie Shui lock agent mix to obtain the final product.
7. the preparation method of scale remover according to claim 6, which is characterized in that first by water, hydrochloric acid, citric acid, EDTA
After mixed dissolution be added metal inhibitor, cleanup additive, Xie Shui lock agent, mix to get.
8. the preparation method of scale remover according to claim 7, which is characterized in that the mode of the mixed dissolution be with
The rate of 800r/min stirs 10~15min.
9. the preparation method of scale remover according to claim 7, which is characterized in that the mode of the mixing is with 1200r/
The rate of min stirs 10~15min.
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Cited By (2)
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| CN112410007A (en) * | 2020-11-20 | 2021-02-26 | 东华理工大学 | Scale remover and application thereof |
| CN114164061A (en) * | 2021-12-16 | 2022-03-11 | 华能山东发电有限公司 | Composite cleaning agent, preparation method thereof and method for treating evaporator scaling |
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