CN100429286C - Protective coating for oil well equipment and its prepn - Google Patents
Protective coating for oil well equipment and its prepn Download PDFInfo
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- CN100429286C CN100429286C CNB2004100440169A CN200410044016A CN100429286C CN 100429286 C CN100429286 C CN 100429286C CN B2004100440169 A CNB2004100440169 A CN B2004100440169A CN 200410044016 A CN200410044016 A CN 200410044016A CN 100429286 C CN100429286 C CN 100429286C
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Abstract
The present invention provides a protective coating for underground equipment in oilfields and a preparing method thereof. Paint is prepared from a polysulfone-epoxy block polymer, a paraffin-proof agent, a filling agent, a diluting agent and a solidifying agent, and the paint is coated into a coating with a certain thickness; the coating of the present invention is obtained by the solidification of the coating with a certain thickness. The coating is resistant to underground high temperature in oilfields and the operating environment containing oil and saline alkali water with high corrosiveness, and the paint has the function of paraffin deposit prevention.
Description
(1) technical field
The present invention proposes a kind of protective coating and preparation method thereof that is used on the equipment of down-hole, oil field.
(2) technical background
The protective material that is used for down-hole, oil field equipment at present mainly can be divided into inorganic coating and organic coating.Inorganic coating is mainly to electroplate or method metal lining, metal alloy or the metal of electroless plating and the composite deposit of other material, and what be most widely used at present is chemical plating nickel-phosphorus alloy.The nickel-phosphorus alloy protective coating has excellent erosion resistance, high thermal resistance, rub resistance, but complex manufacturing, in the plating process evolving hydrogen reaction is arranged, be very easy to cause hole, thereby cause the pitting attack of coating, this technology produces a large amount of heavy metal-containing waste waters, waste water is more difficult, processing costs is also higher, and this technology material cost is also higher in addition, has therefore greatly limited the application of this technology.The organic protection material is mainly based on macromolecular material, wherein mainly is Resins, epoxy and with the Resins, epoxy of other polymer modification, as epoxy phenolics, coal tar epoxy resin etc.In actual application, find, the destructive principal element of Resins, epoxy type coating in the working environment at coal mines of high temperature, oil-containing, saliferous buck is: on the one hand, crude oil can cause breakdown of coating with the resin coating swelling, and the saliferous buck also damages resin coating easily on the other hand.The hot environment of down-hole all plays promoter action to above two factors.Therefore the oil-proofness, resistance to salt water and the high thermal resistance that improve resin are to improve the key and the fundamental way of resene protective coating performance.In addition, the dissolved wax (is mainly C in the crude oil
15～C
70Straight-chain paraffin, normal temperature is solid down, when with crude oil in colloid, when bituminous matter is mixed then for viscous liquid) rise to from the shaft bottom the process of well head at crude oil because the reduction of temperature, pressure, cause solubleness to descend and separate out and condense on the equipment wall of down-hole and form wax deposition.Wax deposition is a unavoidable problem in the field produces, and serious wax deposition causes the underproduction even stopping production, and frequent paraffin removal also can make production efficiency descend, and productive expense improves.
(3) summary of the invention
The present invention proposes a kind of with prepolymer block modified epoxide resin protective coating of liquid polysulfide and preparation method thereof.In coating, use the material of main part of poly-sulphur-epoxidized block copolymer as protective, it be by liquid polysulfide prepolymer and Resins, epoxy under the effect of organic amine catalyzer, reaction generates segmented copolymer.Preparation by above-mentioned poly-sulphur 3 coatings: down-hole, the oil field equipment of desire protection is carried out surperficial pre-treatments such as oil removing, rust cleaning in advance to obtain the clean surface, coating with method for preparing is coated in the certain thickness coating of its surface one-tenth with modes such as dip-coating, brushing, sprayings again, at last coating is carried out solidification treatment fully under 30～120 ℃ temperature.
(4) embodiment
Embodiment 1:
With molecular-weight average is that 4.0 kilograms of 4000 end sulfydryl liquid polysulfide prepolymers join for 20.0 kilograms with E-51 Resins, epoxy and have in the agitator reactor, stirring also is heated to 80 ℃, add 2 of 5 grams, 4,6-, the N-dimethylaminomethyl) phenol, reacted 2 hours, be cooled to room temperature, obtain poly-sulphur-epoxidized block copolymer.With 100 parts of poly-sulphur-epoxidized block copolymers of obtaining, 5 parts of paraffin inhibitor chemicals, 30 parts of silica powders, 0.1 part of aerosil, 5 parts of reactive thinners, 15 parts of thorough mixing of organic amine solidifying agent evenly back are standby.Down-hole, the oil field equipment of desire protection is carried out surperficial pre-treatments such as oil removing, rust cleaning in advance to obtain the clean surface.The coating for preparing is sprayed at the surface of equipment equably, up to the thickness that need to obtain.With this coating at 100 ℃ of completion of cures.
Embodiment 2:
With molecular-weight average is that 10.0 kilograms of 1000 end sulfydryl liquid polysulfide prepolymers join for 40.0 kilograms with E-44 Resins, epoxy and have in the agitator reactor, stirring also is heated to 70 ℃, adds 50 gram diethylenetriamines, reacts 2 hours, be cooled to room temperature, obtain poly-sulphur-epoxidized block copolymer.With 100 parts of poly-sulphur-epoxidized block copolymers of obtaining, 0.1 part of paraffin inhibitor chemical, 40 parts of Graphite Powder 99s, 5 parts in iron oxide red powder, 0.2 part of aerosil, 15 parts of reactive thinners, 10 parts in organic amine solidifying agent, 3 parts of thorough mixing of imidazole curing agent evenly back are standby.Down-hole, the oil field equipment of desire protection is carried out surperficial pre-treatments such as oil removing, rust cleaning in advance to obtain the clean surface.The coating for preparing is sprayed at the surface of equipment equably, up to the thickness that need to obtain.With this coating at 80 ℃ of completion of cures.
Embodiment 3:
With molecular-weight average is that 25.0 kilograms of 2500 end sulfydryl liquid polysulfide prepolymers join for 40.0 kilograms with E-51 Resins, epoxy and have in the agitator reactor, stirring also is heated to 60 ℃, adds 100 gram diethylenetriamines, reacts 5 hours, be cooled to room temperature, obtain poly-sulphur-epoxidized block copolymer.With 100 parts of poly-sulphur-epoxidized block copolymers of obtaining, 1 part of paraffin inhibitor chemical, 25 parts of silica powders, 10 parts of carbon blacks, 5 parts in iron oxide red powder, 0.2 part of aerosil, 10 parts of non-activated thinners, 10 parts of thorough mixing of imidazole curing agent evenly back are standby.General-epoxidized block copolymer, paraffin inhibitor chemical, weighting agent, thinner and solidifying agent are mixed with coating according to a certain percentage, and this coating is applied into certain thickness coating and curing.Because poly-sulphur polymkeric substance has excellent oil-proofness and salt water resistance corrosive ability, the mode of block copolymerization can be in conjunction with two kinds of raw-material advantages of copolymerization, and remedy its shortcoming, therefore give the coating high corrosion resistance.Paraffin inhibitor chemical in the coating is the mixture of being made up of condensed ring aromatic hydrocarbon and derivative thereof, mainly from 230～390 ℃ cut in the coal tar.Because the solubility parameter of poly-sulphur polymkeric substance and paraffin inhibitor chemical differs greatly, paraffin inhibitor chemical can migrate to coatingsurface lentamente from the coating after solidifying, the oil repellency of poly-sulphur polymkeric substance and its flexible segment make coating have the performance of excellent anti-wax deposition for this migration provides power and passage.This coating can be used as the protective coating of down-hole, oil field equipment, not only can tolerate high temperature, the crude oil of down-hole, oil field, the highly corrosive environment for use of saliferous buck, prolongs the work-ing life of equipment, but also has the function of anti-wax deposition.
The preparation method of this coating is as follows:
The preparation of 1 poly-sulphur-epoxidized block copolymer: under the effect of organic amine catalyzer,, generate segmented copolymer 50～100 ℃ of reactions 0.5～5 hour by liquid polysulfide prepolymer and Resins, epoxy.The liquid polysulfide prepolymer is 5～80: 100 (mass ratioes) with the ratio of Resins, epoxy.The molecular-weight average of liquid polysulfide prepolymer is between 500～10000 and have a sulfydryl end functional group.The organic amine catalyzer should have a tertiary amine functional group at least, as diethylenetriamine, benzyl dimethyl amine, 2,4, and 6-(N, N-dimethylaminomethyl) phenol etc., consumption is 0.1～10% (mass ratio) of liquid polysulfide prepolymer.
The preparation of 2 coating: mix according to a certain percentage by poly-sulphur-epoxidized block copolymer, weighting agent, thinner and solidifying agent, be mixed with coating.The composition of coating and proportioning are:
(1) poly-sulphur-epoxidized block copolymer: by above-mentioned preparation method's preparation, consumption is 100 parts.
(2) paraffin inhibitor chemical: the mixture of being made up of condensed ring aromatic hydrocarbon and derivative thereof, mainly from 230～390 ℃ cut in the coal tar, consumption is 0.1～5 part.
(3) weighting agent: can select in silica powder, aluminum oxide powder, Graphite Powder 99, iron oxide red powder, carbon black and the aerosil powder one or more for use, consumption is 5～50 parts.
(4) thinner: can select activity or non-activated thinner for use, consumption is 0～30 part.
(5) solidifying agent: can select in organic amine and the imidazole curing agent one or both for use, consumption is 5～50 parts.
Down-hole, the oil field equipment of desire protection carries out surperficial pre-treatments such as oil removing, rust cleaning in advance to obtain the clean surface.The coating for preparing is sprayed at the surface of equipment equably, up to the thickness that need to obtain.With this coating at 70 ℃ of completion of cures.
Embodiment 4:
With molecular-weight average is that 40.0 kilograms of 8000 end sulfydryl liquid polysulfide prepolymers join for 50.0 kilograms with E-51 Resins, epoxy and have in the agitator reactor, stirring also is heated to 70 ℃, add benzyl dimethyl amine 70 grams, diethylenetriamine 100 grams, reacted 2 hours, be cooled to room temperature, obtain poly-sulphur-epoxidized block copolymer.With 100 parts of poly-sulphur-epoxidized block copolymers of obtaining, 0.5 part of paraffin inhibitor chemical, 20 parts of Graphite Powder 99s, 25 parts in iron oxide red powder, 1 part of aerosil, 50 parts of reactive thinners, 10 parts of non-activated thinners, 45 parts in organic amine solidifying agent, thorough mixing evenly back are standby.Down-hole, the oil field equipment of desire protection is carried out surperficial pre-treatments such as oil removing, rust cleaning in advance to obtain the clean surface.The coating for preparing is sprayed at the surface of equipment equably, up to the thickness that need to obtain.With this coating at 30 ℃ of completion of cures.
Claims (2)
1. the protective coating of down-hole, oil field equipment, it is characterized in that: this coating is by 100 parts of poly-sulphur-epoxidized block copolymers, 0.1～5 part of paraffin inhibitor chemical, 5～50 parts of weighting agents, 0～30 part of thinner, solidifying agent is mixed with coating for 5～50 parts, this coating applied into certain thickness coating and solidify and obtain, poly-sulphur-epoxidized block copolymer wherein be by liquid polysulfide prepolymer and Resins, epoxy under the effect of organic amine catalyzer, generate 50～100 ℃ of reactions 0.5～5 hour, the mass ratio of liquid polysulfide prepolymer and Resins, epoxy is 5～80: 100, the molecular-weight average of liquid polysulfide prepolymer is between 500～10000 and have a sulfydryl end functional group, the organic amine catalyzer should have a tertiary amine functional group at least, consumption is 0.1～10 quality % of liquid polysulfide prepolymer, and paraffin inhibitor chemical wherein is the mixture of being made up of condensed ring aromatic hydrocarbon and derivative thereof.
2. protective coating according to claim 1, wherein said weighting agent is one or more in silica powder, aluminum oxide powder, Graphite Powder 99, iron oxide red powder, carbon black and the aerosil powder, wherein said thinner is reactive thinner or non-activated thinner, and wherein said solidifying agent is one or both in organic amine and the imidazole curing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100440169A CN100429286C (en) | 2004-11-08 | 2004-11-08 | Protective coating for oil well equipment and its prepn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100440169A CN100429286C (en) | 2004-11-08 | 2004-11-08 | Protective coating for oil well equipment and its prepn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1772821A CN1772821A (en) | 2006-05-17 |
| CN100429286C true CN100429286C (en) | 2008-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100440169A Expired - Fee Related CN100429286C (en) | 2004-11-08 | 2004-11-08 | Protective coating for oil well equipment and its prepn |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101659828B (en) * | 2008-08-25 | 2012-01-11 | 武汉菲凡士建材有限公司 | High abrasion-resistant environmental protection floor coating and production and construction process thereof |
| CN110317536A (en) * | 2019-07-03 | 2019-10-11 | 庆阳洲阳石油机械制造有限公司 | Anti-corrosion, wax control, antifouling coating and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1375533A (en) * | 2001-03-16 | 2002-10-23 | 锦州石油化工公司设备研究所 | Polysulfide rubber modified anticorrosive sewage-preventing epoxy resin paint |
| WO2003076487A1 (en) * | 2002-03-14 | 2003-09-18 | Thioplast Chemicals Gmbh & Co. Kg | Method for the production of epoxidized polysulfides |
| CN1482190A (en) * | 2003-08-13 | 2004-03-17 | 薛峻峰 | Antiseptic and antiscaling affusion oil pipe comprising novel titanium nano polymer |
-
2004
- 2004-11-08 CN CNB2004100440169A patent/CN100429286C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1375533A (en) * | 2001-03-16 | 2002-10-23 | 锦州石油化工公司设备研究所 | Polysulfide rubber modified anticorrosive sewage-preventing epoxy resin paint |
| WO2003076487A1 (en) * | 2002-03-14 | 2003-09-18 | Thioplast Chemicals Gmbh & Co. Kg | Method for the production of epoxidized polysulfides |
| CN1482190A (en) * | 2003-08-13 | 2004-03-17 | 薛峻峰 | Antiseptic and antiscaling affusion oil pipe comprising novel titanium nano polymer |
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| Publication number | Publication date |
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| CN1772821A (en) | 2006-05-17 |
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Granted publication date: 20081029 Termination date: 20101108 |