CN106635106A - Visco-elastic high-softening point asphalt particles, preparation method and application thereof - Google Patents
Visco-elastic high-softening point asphalt particles, preparation method and application thereof Download PDFInfo
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- CN106635106A CN106635106A CN201510729315.4A CN201510729315A CN106635106A CN 106635106 A CN106635106 A CN 106635106A CN 201510729315 A CN201510729315 A CN 201510729315A CN 106635106 A CN106635106 A CN 106635106A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/14—Solidifying, Disintegrating, e.g. granulating
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/02—Working-up pitch, asphalt, bitumen by chemical means reaction
- C10C3/023—Working-up pitch, asphalt, bitumen by chemical means reaction with inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/02—Working-up pitch, asphalt, bitumen by chemical means reaction
- C10C3/026—Working-up pitch, asphalt, bitumen by chemical means reaction with organic compounds
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- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Structural Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Working-Up Tar And Pitch (AREA)
Abstract
The invention discloses a visco-elastic high-softening point asphalt particles, a preparation method and an application thereof. The particle size of the visco-elastic high-softening point asphalt particles is less than or equal to 120 [mu]m, the visco-elastic high-softening point asphalt particles comprise a core formed by grafted activated asphalt and a shell formed by a modifier, and comprise 7-9 parts of core and 1-3 parts of shell by mass parts; the grafted activated asphalt is prepared by a reaction of basic asphalt and organic acid anhydrides under temperature of 150-250 DEG C, the modifier comprises poly-sulphur and free sulphur, and the weight ratio of the poly-sulphur to free sulphur in the modifier is 3:7-7:3. The asphalt particles is subjected to melt polymerization through sulphur and are respectively injected for counter current contact from two ends of the reaction tower with the fusion grafted activated asphalt, and then the materials are injected to quenching liquid for quenching. The prepared asphalt is the grafted activated asphalt coated with a layer of high elastic poly-sulphur, the particle size of the particles is small, the particles have certain elastic deformation capability, have excellent high temperature resistance performance, and can be stored under normal temperature in a stable mode.
Description
Technical field
The present invention relates to a kind of viscoplasticity high softening point bitumen and preparation method thereof, more particularly to a kind of less high softening point bitumen with deformability of particle diameter.
Background technology
High softening point bitumen refers to softening point more than 100 DEG C, especially the pitch more than 120 DEG C.High softening point bitumen has to compare and is widely applied because of its outstanding high-temperature resistance.Such as it is used as the roof cover of building, even if will not also become very soft or even trickling during the broiling summer.In can be also used for the drillng operation in deep-seated oil gas field, as the important component part of drilling fluid, closure, anti-collapse, stabilizing borehole, the effect of reduced rate filter loss can be under the high temperature conditions played.Further, it is also possible to be used as the property-modifying additive of macromolecular material etc..
Asphalt product has extensive purposes during oil/gas drilling, can be used as drilling fluid（It is commonly called as mud）Important component part, be one of indispensable important dose of kind of domestic and international modern drilling engineering, with good anti-collapse, lubrication, reduce the comprehensive effectiveness such as leak-off and high-temperature stable.As the development of Petroleum finance, drilling depth are constantly deepened, drilling strata is more and more complicated, and the quantity of the special well such as directional well, horizontal well gradually increases.This makes drilling engineering put forward higher requirement drilling fluid asphalt product and its system.The high-temperature operation requirement that common softening point asphalt be able to cannot be met under deep-well because even trickling is overbated.The high softening point bitumen that high-temperature behavior is good, have good seal-off effect and filtration reduction is developed, to meet the needs of oil drilling engineering, tool is of great significance.
In order to improve the performance of drilling fluid asphalt product, many methods are successively disclosed both at home and abroad pitch is modified.Wherein topmost method just carries out sulfonation to pitch.Such as US3485745, CN99109453, CN201010250241.Although this method can increase the water solubility of product, oil solution ratio is relatively low.Sulfonate is mainly generated after pitch is sulfonated, the softening point of product is not almost measured and, can only use under relatively low temperature conditionss.And its particle is poor without elasticity, deformability, it is impossible to the duct in arbitrarily embedded well, particularly irregular shape duct, it is impossible to function well as closure and the effect of filtrate reducing.Meanwhile, this technique is more complicated, and pollution is easily caused to environment.
High softening point bitumen is when used in drilling fluid, it is desirable to be distributed in mud system with small particle, so both can ensure that pitch was uniformly dispersed, and can avoid being agglomerated into larger block blocking vibration sieve and causing the generation of the problems such as cannot using again.Under normal circumstances, the Particle size requirements of pitch particle are below 120 μm, or even less than 100 μm can normally use.
However, it is very difficult that pitch is ground into into little particle.The material of building stones or coal class can be ground into using general disintegrating apparatus for the particle of very little.But pitch has very big difference with above-mentioned substance.Because in crushing process, with the high speed rotation and material friction of pulverizer substantial amounts of heat is produced, rise can temperature of charge much higher.Pitch can be softened, be become sticky, even if pulverized little particle also can again be bonded to big particle due to its special physical property with the rising of temperature.And the particle diameter of crushing is less, such case is more obvious.
In order to solve these problems, CN95120535 discloses a kind of method for producing high softening point bitumen fine particle.It mainly includes three steps：First raw material and water are made into emulsion, then extract from the fine particle of emulsion and remove light component, be finally separating and reclaim pitch fine particle.The method can obtain tiny pitch particle, and shortcoming is complex technical process, need to use a large amount of organic solvents, production cost to improve during extraction.Drying is needed in last recovery treatment stage, the fusing of pitch particle part is easily caused and is bonded together again.
CN201110353561 discloses a kind of method of addition solid dispersion and coating agent during pitch is crushed to solve the problems, such as the crushing of high softening point bitumen, achieves certain effect.But the solid dispersion for introducing is inert component, may be to destroying drilling fluid system to a certain extent.Additionally, pitch particle will not bond again when storing under in order to ensure normal temperature, in addition it is also necessary to it is possible to additionally incorporate coating agent, increased the complexity of cost and technique.
Therefore, need a kind of particles little in prior art, reunion will not occur during storage at normal temperature and be adhered, and the high softening point bitumen particle with appropriate variability capacity.
The content of the invention
The auxiliary agent that other destructions use system is introduced for preparing the procedure complexity of the high softening point bitumen particle for meeting drilling fluid use requirement, preparation process needs in prior art using organic solvent, needs, pitch particle can not be stored at normal temperatures for a long time, or the defect such as broken rear particle deformability difference, the present invention provides a kind of viscoplasticity high softening point bitumen particle, it is used as modifying agent by introducing the mixture of polymerised sulphur and non-polymeric sulphur, prepare particle diameter little, softening point is high, and deformability is good and the pitch particle that can store steadily in the long term at normal temperatures.
The technical purpose of the present invention is achieved through the following technical solutions：
A kind of viscoplasticity high softening point bitumen particle, particle diameter≤120 μm of the pitch particle, the shell formed including the core being made up of grafting and activating pitch and by modifying agent, according to the mass fraction, core is 7 ~ 9 parts, and shell is 1 ~ 3 part；
The grafting and activating pitch reacts preparation, at least one of the organic acid anhydride in maleic anhydride, poly- ethanedioic acid acid anhydride, poly- glutaric anhydride, poly- azelaic acid acid anhydride and polyisobutylene butanedioic anhydride by basic asphalt and organic acid anhydride at 150-250 DEG C；
The modifying agent includes polymerised sulphur and free sulphur, and the weight ratio of polymerised sulphur and free sulphur is 3 in modifying agent:7~7:3.
Further, the basic asphalt is the pitch that softening point is 100～200 DEG C, at least one in oxidized asphalt, solvent deoiling pitch, bitumen.
Further, the modifying agent is by sulphur being heated to into 250 ~ 350 DEG C of meltings, inert gas is passed through, keeping 0.5 ~ 2.0MPa of pressure, reaction to carry out chilling after 10 ~ 100 minutes and obtain.Prepared during modifying agent by sulphur, also need to add stabilizer during sulfur melting, the stabilizer is olefines or halogenated aryl hydrocarbon class.
Further, the stabilizer is selected from 1- 12（Carbon）Alkene, 1- 14（Carbon）Alkene, 1- 18（Carbon）At least one in alkene, butadiene, chlorobutadiene, isoprene, styrene, hexachloroparaxylene (HPX), iodonitrobenzene and bromo nitryl benzene；.
Another technical purpose of the present invention is the preparation method for providing above-mentioned viscoplasticity high softening point bitumen particle, is comprised the following steps：
1. Cosan is heated to into 250 ~ 350 DEG C, after 10 ~ 60 minutes, adds stabilizer, while being passed through inert gas, keep 0.5 ~ 2.0MPa of pressure, reacted 10 ~ 100 minutes, make sulfur melting be polymerized, form liquid modifier；
2. basic asphalt is heated to into molten condition, addition accounts for the organic acid anhydride of pitch weight 2 ~ 20%, and being passed through inert gas makes pitch reactor pressure be maintained at 0.2-1.0MPa, and reaction temperature is 150-250 DEG C, reacts 2-8 hours, obtains grafting and activating pitch reactant liquor；
3. the grafting and activating pitch reactant liquor by step liquid modifier and step 1. 2. is sprayed into respectively from reaction tower two ends, by sulphur：The weight ratio of grafting and activating pitch reactant liquor is 1 ~ 3:7 ~ 9, the two counter current contacting is made, kept for 10 ~ 60 minutes；
4. the product that 3. step obtains is injected in 40 ~ 65 DEG C of quenching liquid carries out chilling, forms the pitch particle of coating modification agent, and is suspended in quenching liquid, is kept for 30 ~ 120 minutes, is then dehydrated and is dried, then gained solid is sieved with vibratory sieve；
The stabilizer is olefines or halogenated aryl hydrocarbon class；At least one of the acid anhydrides in maleic anhydride, poly- ethanedioic acid acid anhydride, poly- glutaric anhydride, poly- azelaic acid acid anhydride and polyisobutylene butanedioic anhydride.
Further, the stabilizer is selected from 1- 12（Carbon）Alkene, 1- 14（Carbon）Alkene, 1- 18（Carbon）At least one in alkene, butadiene, chlorobutadiene, isoprene, styrene, hexachloroparaxylene (HPX), iodonitrobenzene and bromo nitryl benzene.Its addition is the 0.01 ~ 0.5% of sulphur weight.
Further, the sulphur selects industrial top grade Cosan（Purity more than 99.5%）, the quenching liquid is water.
Viscoplasticity high softening point bitumen particle high-temperature function admirable prepared by the present invention, with certain elastic deformability, suitable normal temperature is stored for a long time（Do not bond）, can be used to prepare drilling fluid, the addition in drilling fluid is 1% ~ 10%.
Compared with prior art, the invention has the advantages that：
（1）In the preparation process in accordance with the present invention, first graft reaction is carried out to basic asphalt, make asphaltene molecule part connect acid anhydrides, asphalt surface is provided with active group, can when contacting with polymerised sulphur with the combined with radical at polymerised sulphur two ends, stabilization is played, the yield of high-elastic polymerised sulphur is improved, therefore, only stabilizer need to be added in sulfur melting polymerization stage, without the need for adding other stabilizers in quenching process, you can reach stablizing effect, simplify technical process.High softening point bitumen is introduced in the sulphur melt polymerization later stage, can make high-elastic sulphur polymer that one layer of clad is formed outside pitch, after follow-up cooling, stable process, form organic whole, improve the performance of pitch particle.
（2）In the inventive method, in sulphur polymerization process inert gas is introduced（Such as N2）, one be on the other hand be to provide enough power to the sulphur atomization after polymerization to play a protective role at high temperature；Further, it is also possible to pass through the adjustment of pressure, carry out the particle size of the final particle of modulation, so as to meet different use requirements.
（3）In general, after sulphur frit reaction, the conversion ratio of high-elastic polymerised sulphur is 40-60%, in this method and it need not be extracted, be purified etc. and processed, because although the sulphur that this part does not convert can not form organic whole with high softening point bitumen, it is good dispersant and interleaving agent, and the high softening-point particle for obtaining in the process of the present invention is without the need for additional other auxiliary agents, production technology can be simplified with normal temperature long term storage.
（4）Method of the present invention process is simple, easy to operate, cost are relatively low, obtained high softening point bitumen is the mixture in the floor height bullet polymerised sulphur of grafting and activating pitch outer cladding one and free sulphur, not only grain diameter is little for products obtained therefrom, with certain elastic deformability, and high temperature resistant property is excellent, being capable of storage-stable at normal temperatures.
Specific embodiment
Following non-limiting examples can make one of ordinary skill in the art that the present invention is more fully understood, but limit the present invention never in any form.
Embodiment 1
The pitch that 400g softening points are 123.3 DEG C is heated to into 160 DEG C in pitch reactor, 12g maleic anhydrides are added, and being passed through inert gas makes pitch reactor pressure be maintained at 0.5MPa, reacts 3 hours, obtains grafting and activating pitch；100g Cosans are placed in closed reaction of Salmon-Saxl kettle, 280 DEG C are heated to, the 1- 12 of 0.1g is added after 40 minutes（Carbon）Alkene, while being passed through N2Keep pressure 1.0MPa.After the completion for the treatment of pitch graft reaction, while opening the valve of reactor, two kinds of liquid are sprayed in contact tower, molten sulfur is entered from tower top, and molten asphalt is entered from tower bottom, makes the two carry out sufficient counter current contacting, is kept for 30 minutes.Contact tower bottom discharge valve is opened, liquid is quickly injected in cold water carries out chilling, form the particle that uniform pitch is integrated with high-elastic sulphur, and be suspended in the middle of quenching liquid.Kept for 30 minutes under the conditions of 45 DEG C, sufficiently solidified and stablized, be then dehydrated and vacuumized dried process.Gained solid is sieved with vibratory sieve, viscoplasticity high softening-point particle is obtained.
Embodiment 2
The pitch that 425g softening points are 132.5 DEG C is heated to into 175 DEG C in pitch reactor, 17g polyisobutylene butanedioic anhydrides are added, and being passed through inert gas makes pitch reactor pressure be maintained at 0.7MPa, reacts 4.5 hours, obtains grafting and activating pitch；75g Cosans are placed in closed reaction of Salmon-Saxl kettle, 300 DEG C are heated to, the isoprene of 0.12g are added after 50 minutes, while being passed through N2Keep pressure 1.5MPa.After the completion for the treatment of pitch graft reaction, while opening the valve of reactor, two kinds of liquid are sprayed in contact tower, molten sulfur is entered from tower top, and molten asphalt is entered from tower bottom, makes the two carry out sufficient counter current contacting, is kept for 40 minutes.Contact tower bottom discharge valve is opened, liquid is quickly injected in cold water carries out chilling, form the particle that uniform pitch is integrated with high-elastic sulphur, and be suspended in the middle of quenching liquid.Kept for 35 minutes under the conditions of 50 DEG C, sufficiently solidified and stablized, be then dehydrated and vacuumized dried process.Gained solid is sieved with vibratory sieve, viscoplasticity high softening-point particle is obtained.
Embodiment 3
The pitch that 350g softening points are 146.7 DEG C is heated to into 190 DEG C in pitch reactor, the poly- ethanedioic acid acid anhydrides of 14g are added, and being passed through inert gas makes pitch reactor pressure be maintained at 0.85MPa, reacts 6 hours, obtains grafting and activating pitch；150g Cosans are placed in closed reaction of Salmon-Saxl kettle, 320 DEG C are heated to, the 1- 18 of 0.26g is added after 55 minutes（Carbon）Alkene, while being passed through N2Keep pressure 1.2MPa.After the completion for the treatment of pitch graft reaction, while opening the valve of reactor, two kinds of liquid are sprayed in contact tower, molten sulfur is entered from tower top, and molten asphalt is entered from tower bottom, makes the two carry out sufficient counter current contacting, is kept for 45 minutes.Contact tower bottom discharge valve is opened, liquid is quickly injected in cold water carries out chilling, form the particle that uniform pitch is integrated with high-elastic sulphur, and be suspended in the middle of quenching liquid.Kept for 40 minutes under the conditions of 55 DEG C, sufficiently solidified and stablized, be then dehydrated and vacuumized dried process.Gained solid is sieved with vibratory sieve, viscoplasticity high softening-point particle is obtained.
Embodiment 4
The pitch that 375g softening points are 164.2 DEG C is heated to into 210 DEG C in pitch reactor, 18.75g maleic anhydrides are added, and being passed through inert gas makes pitch reactor pressure be maintained at 1.0MPa, reacts 5.5 hours, obtains grafting and activating pitch；125g Cosans are placed in closed reaction of Salmon-Saxl kettle, 340 DEG C are heated to, the hexachloroparaxylene (HPX) of 0.20g are added after 40 minutes, while being passed through N2Keep pressure 1.6MPa.After the completion for the treatment of pitch graft reaction, while opening the valve of reactor, two kinds of liquid are sprayed in contact tower, molten sulfur is entered from tower top, and molten asphalt is entered from tower bottom, makes the two carry out sufficient counter current contacting, is kept for 50 minutes.Contact tower bottom discharge valve is opened, liquid is quickly injected in cold water carries out chilling, form the particle that uniform pitch is integrated with high-elastic sulphur, and be suspended in the middle of quenching liquid.Kept for 35 minutes under the conditions of 60 DEG C, sufficiently solidified and stablized, be then dehydrated and vacuumized dried process.Gained solid is sieved with vibratory sieve, viscoplasticity high softening-point particle is obtained.
The performance such as percent of pass after softening point, particle mean size, the sieve of the viscoplasticity high softening-point particle obtained in each embodiment is determined, as a result such as table 1.
The high softening point bitumen particle obtained in the various embodiments described above is placed in the drilling mud that 400mL is prepared（Dosage is 3%）, high speed shear 10 minutes is subsequently adding the lauryl sodium sulfate for accounting for quality of mud fluid 0.2%, continues to shear 10 minutes, obtains drilling fluid system, and its properties result is as shown in table 2.
High softening point bitumen composition grain property in the embodiment of table 1.
Note：Percent of pass refers to after sieve：After particulate matter normal temperature is stacked 30 days, with being sieved with the standard screen of same apertures when just preparing, the percentage of gross mass is accounted for by the granular mass of sieve aperture.The index mainly investigates stability of the particulate matter after storage, i.e. change of size situation.
The property of the drilling fluid of table 2.
Claims (10)
1. a kind of viscoplasticity high softening point bitumen particle, it is characterised in that：Particle diameter≤120 μm of the pitch particle, the shell formed including the core being made up of grafting and activating pitch and by modifying agent, according to the mass fraction, core is 7 ~ 9 parts, and shell is 1 ~ 3 part；
The grafting and activating pitch reacts preparation, at least one of the organic acid anhydride in maleic anhydride, poly- ethanedioic acid acid anhydride, poly- glutaric anhydride, poly- azelaic acid acid anhydride and polyisobutylene butanedioic anhydride by basic asphalt and organic acid anhydride at 150-250 DEG C；
The modifying agent includes polymerised sulphur and free sulphur, and the weight ratio of polymerised sulphur and free sulphur is 3 in modifying agent:7~7:3.
2. viscoplasticity high softening point bitumen particle according to claim 1, it is characterised in that：The basic asphalt is the pitch that softening point is 100 ~ 200 DEG C, at least one in oxidized asphalt, solvent deoiling pitch, bitumen.
3. viscoplasticity high softening point bitumen particle according to claim 1, it is characterised in that：The modifying agent is by sulphur being heated to into 250 ~ 350 DEG C of meltings, inert gas is passed through, keeping 0.5 ~ 2.0MPa of pressure, reaction to carry out chilling after 10 ~ 100 minutes and obtain.
4. viscoplasticity high softening point bitumen particle according to claim 3, it is characterised in that：Prepared during modifying agent by sulphur, also need to add stabilizer during sulfur melting, the stabilizer is olefines or halogenated aryl hydrocarbon class.
5. viscoplasticity high softening point bitumen particle according to claim 4, it is characterised in that：The stabilizer is selected from 1- 12（Carbon）Alkene, 1- 14（Carbon）Alkene, 1- 18（Carbon）At least one in alkene, butadiene, chlorobutadiene, isoprene, styrene, hexachloroparaxylene (HPX), iodonitrobenzene and bromo nitryl benzene.
6. the preparation method of the viscoplasticity high softening point bitumen particle described in claim 1 ~ 5 any one, comprises the following steps：
1. Cosan is heated to into 250 ~ 350 DEG C, after 10 ~ 60 minutes, adds stabilizer, while being passed through inert gas, keep 0.5 ~ 2.0MPa of pressure, reacted 10 ~ 100 minutes, make sulfur melting be polymerized, form liquid modifier；
2. basic asphalt is heated to into molten condition, addition accounts for the organic acid anhydride of pitch weight 2 ~ 20%, and being passed through inert gas makes pitch reactor pressure be maintained at 0.2-1.0MPa, and reaction temperature is 150-250 DEG C, reacts 2-8 hours, obtains grafting and activating pitch reactant liquor；
3. the grafting and activating pitch reactant liquor by step liquid modifier and step 1. 2. is sprayed into respectively from reaction tower two ends, by sulphur：The weight ratio of grafting and activating pitch reactant liquor is 1 ~ 3:7 ~ 9, the two counter current contacting is made, kept for 10 ~ 60 minutes；
4. the product that 3. step obtains is injected in 40 ~ 65 DEG C of quenching liquid carries out chilling, forms the pitch particle of coating modification agent, and is suspended in quenching liquid, is kept for 30 ~ 120 minutes, is then dehydrated and is dried, then gained solid is sieved with vibratory sieve；
The stabilizer is olefines or halogenated aryl hydrocarbon class；At least one of the acid anhydrides in maleic anhydride, poly- ethanedioic acid acid anhydride, poly- glutaric anhydride, poly- azelaic acid acid anhydride and polyisobutylene butanedioic anhydride.
7. the preparation method of viscoplasticity high softening point bitumen particle according to claim 6, it is characterised in that：The stabilizer is selected from 1- 12（Carbon）Alkene, 1- 14（Carbon）Alkene, 1- 18（Carbon）At least one in alkene, butadiene, chlorobutadiene, isoprene, styrene, hexachloroparaxylene (HPX), iodonitrobenzene and bromo nitryl benzene.
8. the preparation method of viscoplasticity high softening point bitumen particle according to claim 6, it is characterised in that：The addition of the stabilizer is the 0.01 ~ 0.5% of sulphur weight.
9. application of the viscoplasticity high softening point bitumen particle described in claim 1 ~ 5 any one in drilling fluid is prepared.
10. application according to claim 9, it is characterised in that：Addition of the viscoplasticity high softening point bitumen particle in drilling fluid is 1% ~ 10%.
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| CN111575040A (en) * | 2020-05-26 | 2020-08-25 | 北京旭阳科技有限公司 | Production method of high-softening-point asphalt |
| CN112126087A (en) * | 2020-09-22 | 2020-12-25 | 闵珩 | High-softening-point asphalt particles and preparation method thereof |
| CN115093571A (en) * | 2022-05-30 | 2022-09-23 | 大连理工大学 | Method for improving asphalt softening point through chemical grafting modification |
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Effective date of registration: 20230829 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: Sinopec (Dalian) Petrochemical Research Institute Co.,Ltd. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: DALIAN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC Corp. |