CN116066747A - Preparation method of drag reducer slurry for oil pipeline - Google Patents
Preparation method of drag reducer slurry for oil pipeline Download PDFInfo
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- CN116066747A CN116066747A CN202111278752.0A CN202111278752A CN116066747A CN 116066747 A CN116066747 A CN 116066747A CN 202111278752 A CN202111278752 A CN 202111278752A CN 116066747 A CN116066747 A CN 116066747A
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- drag reducer
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 60
- 239000002002 slurry Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 229920000642 polymer Polymers 0.000 claims abstract description 60
- 239000000725 suspension Substances 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 30
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000012216 screening Methods 0.000 claims abstract description 4
- 239000002270 dispersing agent Substances 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 27
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical group CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 24
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 22
- 238000000227 grinding Methods 0.000 claims description 22
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical group CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 15
- 239000003921 oil Substances 0.000 claims description 13
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000005054 agglomeration Methods 0.000 claims description 8
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical group CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 7
- 230000002776 aggregation Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- -1 alkyl alcohol amide Chemical class 0.000 claims description 5
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 5
- 239000008116 calcium stearate Substances 0.000 claims description 5
- 235000013539 calcium stearate Nutrition 0.000 claims description 5
- 150000002191 fatty alcohols Chemical class 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229920013639 polyalphaolefin Polymers 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000004359 castor oil Substances 0.000 claims description 2
- 235000019438 castor oil Nutrition 0.000 claims description 2
- 230000001804 emulsifying effect Effects 0.000 claims description 2
- 230000008014 freezing Effects 0.000 claims description 2
- 238000007710 freezing Methods 0.000 claims description 2
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 235000019359 magnesium stearate Nutrition 0.000 claims description 2
- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 description 10
- 229920002367 Polyisobutene Polymers 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 5
- 230000008961 swelling Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 238000010981 drying operation Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 description 3
- 125000003368 amide group Chemical group 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004200 microcrystalline wax Substances 0.000 description 1
- 235000019808 microcrystalline wax Nutrition 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/16—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention discloses a preparation method of drag reducer slurry for a finished oil pipeline. The method comprises the following steps: (1) screening and preparing a suspension medium; (2) adding an emulsifying agent, and stirring until the mixture is uniformly mixed; (3) Adding the polymer powder into the suspension medium in the step (2) under stirring, and uniformly mixing; (4) And (3) adding a re-dispersing agent into the system obtained in the step (3), uniformly mixing, and standing to obtain drag reducer slurry. According to the invention, after the drag reducer polymer powder is added and stirred uniformly, the redispersing agent is added, and compared with the existing preparation method, the stability of the obtained drag reducer suspension is obviously improved.
Description
Technical Field
The invention relates to a preparation method of drag reducer slurry for a finished oil pipeline.
Background
The drag reducer is used as a chemical auxiliary agent, and has the advantages of low addition amount, quick effect, strong stability, small influence on oil quality and the like, so that the drag reducer is widely applied to the transportation of crude oil and finished oil pipelines, wherein the requirement on the drag reducer is higher when the drag reducer is applied to the transportation of the finished oil pipelines.
At present, the drag reducer polymer is most commonly poly alpha-olefin, is used as a long-chain high polymer, has certain viscosity and elasticity in a normal state, is required to be processed into powder with smaller particle size at a low temperature, and can play a role in drag reduction by inhibiting turbulence through long-chain molecules in a pipe oil product after preparing a drag reducer suspension.
In the low-temperature crushing and grinding process of the drag reducer polymer, the new surface is not completely coated by the added isolating agent, and the re-agglomeration phenomenon after material collection generally occurs due to the influence of surface moisture after temperature return, so that the material is greatly wasted in severe cases.
The drag reducing agent polymer swells to some extent in its slurry, subject to polarity differences and usage requirements. This swelling sometimes exacerbates drag reducer suspension stratification and agglomerates soon after stratification, after which the agglomerated polymer powder cannot be redispersed even if it is stirred again, affecting use.
In the prior art, the drag reducer disclosed in chinese patent document CN 113121752a, although improving stability, contains an aqueous phase in its components, and cannot be added to a pipeline for transporting the finished oil. In the drag reducer and slurry preparation method disclosed in chinese patent document CN 107090134a, after slurry polymerization is performed on the α -olefin monomer and the lower silicone phase is separated, the upper polymer phase still needs to be crushed, and the crushing method of the shearing machine is difficult to obtain particles with a desired particle size range after practice, which affects the stability of the suspension prepared subsequently. The presence of silicone oil in the polymer phase contributes little to the stability of the final drag reducer suspension and increases the difficulty of slurry density and viscosity formulation. In the drag reducer preparation method disclosed in the Chinese patent document CN 112125996A, powder is prepared by adopting a method of mixing and grinding a polymer and grinding liquid at normal temperature, however, the method has poor grinding effect on the polymer with stronger surface viscosity, and the powder is seriously agglomerated, so that the stability of a later suspension is influenced.
Disclosure of Invention
The invention aims to provide an improved preparation method of a drag reducer for a finished oil pipeline, which aims to solve the technical problem that the stability of the slurry of the drag reducer obtained by the existing preparation process is poor.
The preparation method of the drag reducer for the finished oil pipeline comprises the following steps:
(1) Screening and preparing a suspension medium;
(2) Adding an emulsifying agent, and stirring until the mixture is uniformly mixed;
(3) Adding polymer powder meeting the particle size requirement into the suspension medium system of the step (2) under stirring, and uniformly mixing;
(4) And (3) adding a re-dispersing agent into the system obtained in the step (3), uniformly mixing, and standing to obtain drag reducer slurry.
Further, the selection of the suspension medium in step (1) is a matter of routine skill in the art, such as screening the suspension medium based on the degree of swelling of the drag reducing agent polymer, the dispersion in gasoline or diesel, flash point, etc., as is typical. The suspension medium is selected from at least one of an alcohol and an ether. In the present invention, the suspension medium preferably comprises a primary suspension medium of an alcohol A and an ether, and a further alcohol B as a density regulator. Still further, the primary suspension medium is selected from the group consisting of amyl alcohol and ethylene glycol butyl ether and the density modulator is selected from the group consisting of propylene glycol. In this application, the inventors found through studies that: compared with the conventional single alcohol and single ether two-component system solution, the alcohol ether solution of the three-component system has the advantages that the adjustable density range is wider, the flash point of propylene glycol is higher (107.2 ℃), and the adverse effect of adding the drag reducer on the safety of oil products can be reduced to a certain extent. Meanwhile, the drag reducer suspension prepared by adopting a three-component system is better in stability.
Further, in step (2), the process of adding the emulsifier may optionally be performed by heating the system to rapidly dissolve the emulsifier, but before adding the polymer powder in step (3), the solution temperature needs to be restored to room temperature, so as to avoid that the higher temperature promotes agglomeration of the powder particles added into the solution, and influences the stability of the suspension. Wherein the addition amount of the emulsifier is 1-10% of the total mass of the suspension. The emulsifier is selected from one or more surfactants which can be dissolved in an alcohol ether system, including, but not limited to peregal O, emulsifier OP, alkyl alcohol amide, alkylphenol ethoxylates, fatty alcohol ethoxylates and castor oil ethoxylates.
Further, the particle size of the polymer powder in the step (3) is generally required to be 40 mesh or more. The polymer powder was slowly added with stirring. The amount of polymer powder added is generally not more than 40%, preferably 30-35% of the total mass of the final formulated suspension.
Further, the addition amount of the redispersing agent in the step (4) is 0.5-2% of the total mass of the final suspension. The redispersing agent includes, but is not limited to, ethylene Bis Stearamide (EBS), microcrystalline wax (milled), and the like, preferably Ethylene Bis Stearamide (EBS).
Further, the method comprises the step (5): after the drag reducer slurry is prepared and kept stand for 1 to 5 days, the drag reducer slurry is homogenized again by a homogenizing emulsifying machine. This step reduces the adverse effect of initial swelling of the polymer particles, effectively increasing the settling time of the suspension.
Further, the finished oil pipeline drag reducer slurry prepared in the step (4) comprises alcohol ether solution of a three-component system, an emulsifier and a redispersing agent.
Further, the drag reducing agent polymer powder of step (3) may be prepared using techniques conventional in the art. In the present invention, the polymer powder is preferably prepared by the following method: a) Firstly, processing the massive polymer into strips or sheets, preferably with the thickness not exceeding 2cm, and freezing in liquid nitrogen for 0.5-5 min; b) Adding a release agent, dispersing the release agent on the surface of the polymer and in a material receiving bin, wherein the mass of the release agent added accounts for 1-5% of the total mass of the polymer material and the release agent and is regulated according to the viscosity of the surface of the material, and the corners of the material receiving bin are required to be covered again, and starting a crusher to crush the polymer material; c) Collecting the preliminary crushed material obtained in the step b), adding a spacer (the mass ratio is 10-30%) and uniformly mixing, and then finely grinding the material; d) Collecting the materials obtained in the step c), and putting the agglomerated materials into a fine grinding machine again for re-grinding; e) And (3) putting the crushed materials into a baking oven for baking, removing the surface moisture of the crushed materials, and preventing agglomeration.
Further, the release agents of step b) and step c) may be agents commonly used in the art to inhibit polymerization, dispersion during polymer comminution, including, but not limited to, various sodium stearate, magnesium stearate, calcium stearate, sodium carbonate, magnesium carbonate, calcium carbonate, talc, silica, and the like.
Further, the rate of liquid nitrogen injection and feed is controlled during the fine grinding of step c). For materials with lower molecular weight and stronger surface viscosity, the feeding speed needs to be controlled at a lower speed. The liquid nitrogen filling is required to ensure that the grinding chamber is in a low-temperature state at all times, water vapor is normally sprayed out from the discharging bag according to the appearance judgment, and the grinding machine is normal when the current of the grinding machine is not overloaded and the outer wall is in a low temperature. And (3) receiving materials as soon as possible after finishing grinding, and placing the materials in an oven for drying to remove water on the surface of the powder, so that the agglomeration influence is reduced.
Further, the powder obtained after fine grinding in step c) is always agglomerated to some extent because its surface is not completely coated with the release agent or is affected by moisture contact during grinding. Thus, in step d), the agglomerated powder is again fed into a fine grinding mill for regrinding, at which point the feed rate may be suitably increased. This step allows the agglomerated powder to be redispersed, helping to further improve the stability of the resulting drag reducer slurry, while also effectively reducing material losses.
Further, in step d), based on the improvement of step b), the agglomerated material in step c) can be subjected to regrind grinding without adding a release agent, while surprisingly improving the dispersion properties of the polymer powder. And the drying operation in the step e) also ensures that the polymer powder obtained after crushing has better dispersibility.
Further, the drag reducing agent polymers used in the present invention include, but are not limited to, polyalphaolefins, preferably polyalphaolefins, so long as they can be prepared as finished oil pipeline drag reducing agents.
The inventors of the present invention have found that drag reducing agent suspensions formulated in conventional manner, after a period of time, are subject to density differences and the like due to swelling of the polymer particles in the slurry system, and that the suspension delaminates and is not redispersible as a result of agglomeration of the polymer particles. In order to solve the problem, the invention provides a preparation method. By introducing the redispersing agent into the slurry system, the agglomeration of polymer particles can be effectively inhibited in the presence of the drag reducer suspension even if the drag reducer suspension is layered after being placed for a long time by utilizing the lubricity of the drag reducer suspension and the synergistic effect of the drag reducer suspension and the emulsifying agent, and the drag reducer suspension can still be normally used after being stirred again.
Compared with the prior art, the method has the following beneficial effects:
1. according to the invention, after the drag reducer polymer powder is added and stirred uniformly, the redispersing agent is added, and compared with the existing preparation method, the stability of the obtained drag reducer suspension is obviously improved. The drag reducer suspension is not easy to delaminate after standing for a plurality of days; even if delamination occurs, after re-stirring, a re-stable dispersion can be achieved without significant caking. The inventors of the present application speculate that the reason is: taking EBS as an example of the redispersing agent, the molecular structure of the EBS has long carbon chains and amide groups; the long carbon chain group enhances the van der Waals attraction between the long carbon chain group and polymer particles, so that the long carbon chain group can be firmly adsorbed on the surfaces of the particles; the polar amide groups are arranged on the outer side and have repulsive force, so that the polymer particles can be effectively prevented from agglomerating. Meanwhile, the EBS can be used as an emulsifier, and the addition sequence of the EBS can be set after the emulsifier and the polymer particles, so that the effect of improving the interface attribute of the slurry medium and the polymer particles by the emulsifier can be effectively exerted and utilized, and EBS molecules can be more easily adsorbed on the surfaces of the polymer particles. Meanwhile, the competition effect between the selected emulsifier and the EBS is avoided, and the synergistic effect is more favorably exerted.
2. In the process of the present invention, a three component system slurry is preferably employed wherein the primary suspension medium is selected from an alcohol and an ether as a poor solvent for the drag reducing agent polymer to maintain the formulated drag reducing agent product at a lower viscosity for on-site filling. And meanwhile, the proper main suspension medium is selected to slow down the swelling influence and enhance the stability of the suspension. The other alcohol is mainly used for adjusting the density of the solution, so that the density adjusting range of the main suspension medium is enlarged, and the adverse effect on the stability of the suspension caused by the fact that the proportion of the alcohol or the ether in the main suspension medium is too high is avoided.
3. The invention provides a method for re-hardening and crushing the agglomerated materials without re-adding a release agent, which is simple to operate and has ideal particle dispersion effect; the conventional low-temperature crushing method is improved, such as the final drying operation, so that the polymer powder obtained after crushing has better dispersibility, is not easy to agglomerate even after being placed for a period of time, is suitable for various drag reducer polymers, and is not limited by conditions such as surface viscosity, glass transition temperature and the like. The preferred low temperature comminution process of this application is combined with the slurry preparation process to further improve the stability of the drag reducer produced. The dispersibility of the polymer particles has a critical effect on the stability of the final formulated drag reducing agent suspension, and if the particles are poorly dispersed prior to addition to the slurry, agglomeration will occur soon after formulation into a suspension, at which point the emulsifier is difficult to re-exert its effective effect. The improved low temperature comminution+slurry preparation process in this application synergistically improves the stability of the final formulated drag reducer suspension by improving the dispersibility of the resulting polymer particles from comminution, the suitability of the slurry, the mutual repulsion of the particles in the slurry, and the like.
Detailed Description
The present invention will be described in more detail with reference to specific examples.
Example 1
Drag reducer polymer: polyisobutene purchased from basf sea division;
suspension medium: amyl alcohol, ethylene glycol methyl ether;
and (3) a release agent: calcium stearate;
emulsifying agent: polyoxyethylene stearate;
redispersing agent: EBS.
The polyisobutene is crushed and ground by adopting a conventional low-temperature crushing method (no re-crushing and no drying operation), and the mass of the release agent is added before the crushing step: the mass of the materials to be crushed is 3:97 (i.e., 3% of the release agent added), 20% of the release agent added before fine grinding.
According to amyl alcohol: the suspension medium is prepared by the mass ratio of the ethylene glycol methyl ether 38:62 (volume ratio of 42:58), the polyoxyethylene stearate with the mass fraction of 3 percent (the mass fraction is the mass ratio of the additive to the finally prepared drag reducer suspension and is the same as the following) is added, and the suspension medium is heated and stirred to be quickly dissolved. Then after the solution temperature was reduced to room temperature, 30% by mass of the polymer powder (sieved through a 40 mesh screen) was slowly added with constant stirring. And finally adding EBS with the mass fraction of 1%, stirring uniformly and standing. After 3 days, the suspension was re-homogenized with a homogenizer, allowed to stand and observed for a long period of time. The sample delaminated on day 53 and the polymer particles only settled rather than agglomerated and could still be redispersed into suspension after stirring.
Comparative example 1
The other conditions were the same as in example 1, except that the EBS addition order was changed to add before the addition of the polymer powder. The sample was observed to delaminate on day 21, with the polymer particles agglomerating into a mass that could not be dispersed after stirring.
Example 2
Drag reducer polymer: polyisobutene purchased from basf sea division;
suspension medium: amyl alcohol, ethylene glycol butyl ether and propylene glycol;
and (3) a release agent: calcium stearate;
emulsifying agent: polyoxyethylene stearate;
redispersing agent: EBS.
The procedure is as in example 1, using conventional cryogenic comminution methods.
According to amyl alcohol: ethylene glycol butyl ether: propylene glycol mass ratio 27:50:23 (volume ratio 3:5:2) to prepare suspension medium, the subsequent procedure is the same as in example 1. The sample was observed to delaminate on day 71, and the polymer particles did not agglomerate after settling, and were still redispersible after stirring.
Comparative example 2
The other conditions were the same as in example 2, except that the EBS addition order was changed to add before the addition of the polymer powder. The sample was observed to delaminate on day 36, with the polymer particles agglomerating into a mass that could not be dispersed after stirring.
Example 3
Otherwise, the same conditions as in example 2 were followed by replacing the drag reducing agent polymer with a virgin polyisobutylene (lower molecular weight, more surface tack). After being prepared into drag reducer suspension, the sample is observed to be layered on the 62 th day, polymer particles are not agglomerated after settling, and the sample can still be redispersed after stirring.
Example 4
The other conditions were the same as in example 1, except that the low-temperature pulverization process was changed to the modified low-temperature pulverization method of the present invention. That is, after the polyisobutylene was crushed and ground by the conventional low-temperature crushing method in example 1, the agglomerated material was sieved (40 mesh) and ground again without adding a release agent again, and all the crushed material was dried after the collection. The sample was observed to delaminate on day 69, and the polymer particles did not agglomerate after settling, and were still redispersible after stirring.
Example 5
The other conditions are the same as in example 4, and only the two-component system suspension medium of amyl alcohol and ethylene glycol methyl ether is changed into the three-component system suspension medium of amyl alcohol, ethylene glycol butyl ether and propylene glycol in example 2 (mass ratio of 27:50:23). After the sample was left to stand for 3 months, it was observed that the sample was not layered.
Example 6
Drag reducer polymer: domestic polyisobutene;
suspension medium: amyl alcohol, ethylene glycol butyl ether and propylene glycol;
and (3) a release agent: calcium stearate;
emulsifying agent: fatty alcohol polyoxyethylene ether;
redispersing agent: EBS.
The improved low-temperature crushing method of the invention is adopted to grind domestic polyisobutene into powder. The procedure is as in example 4.
According to amyl alcohol: ethylene glycol butyl ether: preparing a suspension medium by propylene glycol according to the mass ratio of 27:50:23, adding 3% of fatty alcohol polyoxyethylene ether, and heating and stirring to enable the fatty alcohol polyoxyethylene ether to be dissolved rapidly. The subsequent procedure is as in example 5. After the sample was left to stand for 3 months, it was observed that the sample was not layered.
Claims (15)
1. A method for preparing drag reducer slurry for a finished oil pipeline, which comprises the following steps:
(1) Screening and preparing a suspension medium;
(2) Adding an emulsifying agent, and stirring until the mixture is uniformly mixed;
(3) Adding polymer powder meeting the particle size requirement into the suspension medium system of the step (2) under stirring, and uniformly mixing;
(4) And (3) adding a re-dispersing agent into the system obtained in the step (3), uniformly mixing, and standing to obtain drag reducer slurry.
2. The method of claim 1, wherein the suspending medium comprises at least one of an alcohol and an ether.
3. The preparation method according to claim 2, wherein the suspension medium comprises a main suspension medium composed of alcohol a and ether, and alcohol B as a density regulator.
4. A process according to claim 3, wherein alcohol a is pentanol, the ether is ethylene glycol butyl ether, and alcohol B is propylene glycol.
5. The method of claim 1, wherein step (2) heats the system to rapidly dissolve the emulsifier.
6. The preparation method according to claim 1, wherein the emulsifier is added in an amount of 1 to 10% of the total mass of the suspension.
7. The method according to claim 1 or 6, wherein the emulsifier is selected from the group consisting of peregal O, emulsifier OP, alkyl alcohol amide, alkylphenol ethoxylate, fatty alcohol ethoxylate and castor oil ethoxylate.
8. The method of preparation according to claim 1, characterized in that the polymer powder is added in an amount not exceeding 40%, preferably 30-35% of the total mass of the finally formulated suspension.
9. The method according to claim 1, wherein the amount of the redispersing agent added in the step (4) is 0.5 to 2% of the total mass of the final slurry.
10. The process according to claim 1 or 9, wherein the redispersing agent is ethylene bis stearamide.
11. The method of manufacturing according to claim 1, further comprising step (5): after the drag reducer slurry is prepared and kept stand for 1 to 5 days, the drag reducer slurry is homogenized again by a homogenizing emulsifying machine.
12. The method of preparation according to claim 1, wherein the polymer powder is prepared by:
a) Firstly, processing the massive polymer into strips or sheets, and freezing in liquid nitrogen for 0.5-5 min;
b) Adding a spacer, dispersing the spacer on the surface of the polymer and in a material receiving bin, and starting a crusher to crush the polymer material;
c) Collecting the preliminary crushed material obtained in the step b), adding a spacer, uniformly mixing, and then finely grinding the material;
d) Collecting the materials obtained in the step c), and putting the agglomerated materials into a fine grinding machine again for re-grinding;
e) And (3) putting the crushed materials into a baking oven for baking, removing the surface moisture of the crushed materials, and preventing agglomeration.
13. The method of claim 12, wherein the release agent is selected from the group consisting of sodium stearate, magnesium stearate, calcium stearate, sodium carbonate, magnesium carbonate, calcium carbonate, talc, and silica.
14. The method of claim 12, wherein in step d) the agglomerated powder is re-fed to a fine grinding mill for re-grinding.
15. The method of making according to claim 1, wherein the drag reducing agent polymer comprises a polyalphaolefin.
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