CN111120872B - Preparation method of drag reducing and pour point reducing dual function high wax crude oil drag reducing agent - Google Patents
Preparation method of drag reducing and pour point reducing dual function high wax crude oil drag reducing agent Download PDFInfo
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 59
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- 230000001603 reducing effect Effects 0.000 title claims abstract description 12
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 46
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 45
- 239000001993 wax Substances 0.000 claims abstract description 41
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 38
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- 238000000034 method Methods 0.000 claims description 21
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- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 5
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- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims 1
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- 230000001105 regulatory effect Effects 0.000 description 3
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Lubricants (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to a preparation method of a drag reducer for high-wax crude oil with drag reduction and pour point depression functions. The preparation method is characterized by comprising the following preparation steps: firstly, weighing dried poly-alpha-olefin solid for drag reduction, putting the poly-alpha-olefin solid into a liquid nitrogen barrel, and putting powdery EVA into another liquid nitrogen barrel; coarsely crushing and grinding the drag reduction poly-alpha-olefin subjected to low-temperature treatment, adding the drag reduction poly-alpha-olefin into a liquid nitrogen barrel, treating the drag reduction poly-alpha-olefin by liquid nitrogen, adding a grinding aid, adding a separant, and grinding the drag reduction poly-alpha-olefin at the temperature lower than-40 ℃; the formed poly-alpha-olefin fine powder particles coated by EVA for reducing the drag. The beneficial effects are that: the invention adopts the ethylene-vinyl acetate copolymer with pour point depression effect as the coating and isolating agent of the poly-alpha-olefin particles for drag reduction, after the ethylene-vinyl acetate copolymer is added into the crude oil, the EVA is dispersed and then interacts with paraffin, colloid and asphaltene, so that the condensation point of the crude oil can be reduced, and the low-temperature fluidity of the crude oil is kept; meanwhile, the poly-alpha olefin for reducing the drag can interfere the intensity of turbulence through deformation to exert the drag reduction effect, thereby realizing the dual functions of drag reduction and pour point depression.
Description
Technical Field
The invention relates to a solvent-adding drag reduction and pour point depression technology in a crude oil pipeline conveying process, in particular to a preparation method of a drag reduction and pour point depression dual-function high-wax crude oil drag reducer.
Background
Crude oil produced by onshore oil fields in China mostly belongs to high-pour-point oil with high wax content and thick oil rich in colloid and asphaltene, and has the characteristics of high pour point, high viscosity, poor fluidity and the like; particularly, in recent years, as the resources of high-quality petroleum are gradually reduced, people pay more attention to the processes of exploitation, storage and transportation of low-quality crude oil with relatively rich reserves. For the problem of poor flowability of the easily coagulated high viscosity at normal temperature, a heating conveying process is mostly adopted in the pipe conveying process, and the defects of high energy consumption, low operation elasticity, easy pipe coagulation and other accidents in the operation process of stopping conveying and restarting a pipeline are caused. Crude oil used to maintain onshore oil fields in production and long-distance pipeline transportation consumes tens of thousands of tons every year; meanwhile, oil pipeline transportation exists: the outstanding problem of large energy consumption of long-distance large-diameter conveying pipelines; for pipelines which are corroded and aged in long-term service, measures such as original design pressure conveying and even pressurization are adopted to maintain original oil conveying quantity, and the problem of serious potential safety accidents is brought; the oil field exploitation yield per se is different from the demand of each period of economic development, so that the conveying equipment of the pipeline with the same caliber is required to have economic and reasonable elastic regulation capacity. Therefore, how to realize the efficient and safe transportation of the easily-coagulated and high-viscosity crude oil, and further saving energy and reducing consumption are important challenges for crude oil pipeline transportation and production in China.
For crude oil drag reducers, the common commercial application is poly-alpha-olefin, which belongs to an ultra-high molecular weight polymer, has the characteristics of easy adhesion and aggregation and gel-like, and the poly-alpha-olefin is directly used as the drag reducers, because the viscoelasticity of the particles is extremely easy to adhere and agglomerate, the dispersion and injection are difficult, and the poly-alpha-olefin particles are adhered and agglomerate after entering crude oil, the dissolution speed of the drag reducers particles is directly reduced, the drag reduction efficiency is reduced, and even pipelines are blocked. Therefore, the poly-alpha-olefin must be fluid for convenient application through a series of post-treatment processes such as crushing, grinding, adding a release agent, dispersing into a final suspension system and the like at the glass transition temperature.
For the pour point depression of high-wax crude oil, the pour point depression method by adding agents is simple and effective, chemical pour point depressants mainly comprise surfactants, polymers and compound copolymers, at present, pour point depressants products at home and abroad mainly comprise ethylene and vinyl acetate copolymers, maleic acid esters and acrylate homopolymers, wherein the ethylene-vinyl acetate copolymers are the most commonly used pour point depressants for the wax-containing crude oil, and have crystalline ethylene chain segments which are eutectic with wax crystals to play a pour point depression role. The polymer pour point depressant has slow dispersion speed in crude oil, so the polymer pour point depressant is generally required to be dissolved and dispersed into the crude oil at a certain temperature to form mother liquor, and then the mother liquor is injected into a pipeline, which requires certain dissolution time and energy consumption.
Disclosure of Invention
The invention aims to provide a preparation method of a drag-reducing and pour point-reducing bifunctional high-wax crude oil drag reducer aiming at the defects in the prior art, which takes an ethylene-vinyl acetate copolymer as an isolating agent, coats and isolates particles of a poly-alpha-olefin drag-reducing polymer by EVA powder to realize the post-treatment process of the drag reducer, and realizes the drag reduction and the pour point reduction of high-wax crude oil by the action of two components, namely poly-alpha-olefin and EVA.
The invention provides a preparation method of a drag-reducing and pour point-depressing bifunctional high-wax crude oil drag reducer, which is characterized by comprising the following preparation steps:
firstly, drying a large anti-drag polyalphaolefin solid, cutting into small blocks of 5cm square, preparing a blocky anti-drag polymer, weighing, putting into a freezing barrel, filling liquid nitrogen until the blocky anti-drag polymer is submerged, and keeping for 30-50 min for use;
secondly, weighing the powdery ethylene-vinyl acetate copolymer, putting the powdery ethylene-vinyl acetate copolymer into a freezing barrel, filling liquid nitrogen into the freezing barrel until the powdery ethylene-vinyl acetate copolymer is submerged, and keeping the powdery ethylene-vinyl acetate copolymer for 10-20 min for use;
thirdly, quickly transferring the blocky anti-drag processed at low temperature in the first step to a crusher for coarse crushing, then transferring the coarse powder to a ball mill, adding an ethylene-vinyl acetate copolymer according to the mass ratio of the coarse powder to the poly-alpha olefin for anti-drag of 1: 1-1: 3, and then adding a grinding aid for grinding at the temperature lower than-40 ℃;
step four, adding a second separant which accounts for 10% of the weight of the poly-alpha-olefin for drag reduction into the ball mill during grinding, and carrying out ball milling and full mixing for a period of time;
fifthly, screening the poly-alpha-olefin fine powder particles for drag reduction formed by ball milling and coated by the ethylene-vinyl acetate copolymer by a 120-mesh electric screen to prepare a high-wax crude oil drag reducer powder drying agent with double functions of drag reduction and pour point depression;
and sixthly, dispersing the bifunctional drag reducer powdery dry agent into an oil-based, water-based or alcohol-based suspension system to obtain a slurry-like drag reducer product of the high-wax crude oil with the functions of drag reduction and pour point depression.
Preferably, the grinding aid is one or a mixture of two of stearic anhydride and calcium stearate according to a certain proportion.
Preferably, the second release agent is needle paraffin or liquid paraffin.
Preferably, the powdery ethylene-vinyl acetate copolymer is one of EVA210, EVA220, and EVA 310.
The invention provides a using method of a drag reduction and pour point depression dual-function high-wax crude oil drag reducer, which comprises the following steps:
according to the physical property, the technical requirement of drag reduction and the technical requirement of pour point depression of crude oil, selecting a difunctional drag reduction pasty drag reduction agent product which is suitable for the proportion of poly-alpha olefin and ethylene-vinyl acetate copolymer for drag reduction, filling at the outlet of a crude oil pipeline heat pump station according to the calculated dosage, wherein the temperature of the crude oil during filling is about 65 ℃, and after 30min, the ethylene-vinyl acetate copolymer coated outside drag reduction agent particles can be dissolved in the crude oil and interacts with paraffin, colloid and asphaltene in the crude oil to play the role of pour point depression, so that the crude oil can keep the fluidity at low temperature; then the poly-alpha-olefin for drag reduction is quickly swelled and influences the intensity of turbulence in a turbulence transition area in the pipeline through elastic deformation, thereby exerting the drag reduction effect. In the application process, the ethylene-vinyl acetate copolymer is dissolved and dispersed firstly, so that the damping effect attenuation effect caused by the interaction of the poly-alpha-olefin and the wax crystal can be prevented, and the poly-alpha-olefin and the wax crystal sequentially act on different objects, thereby realizing the double functions of damping and pour point depression and the synergistic effect.
The invention has the beneficial effects that: according to the invention, the ethylene-vinyl acetate copolymer (EVA) with the pour point depression effect is selected as the coating and isolating agent of the poly-alpha-olefin particles for drag reduction, and after the EVA is added into the crude oil, the EVA is dispersed and then interacts with paraffin, colloid and asphaltene, so that the pour point of the crude oil can be reduced, and the low-temperature fluidity of the crude oil is maintained; meanwhile, the poly-alpha olefin for reducing the drag can interfere the intensity of turbulence through deformation to exert the drag reduction effect, thereby realizing the dual functions of drag reduction and pour point depression.
Drawings
FIG. 1 is a schematic diagram of a rotary disk test system according to the present invention;
in the figure: constant temperature water bath 1, shaft coupling 2, torque sensor 3, buncher 4, data line 5, computer 6, sample groove 7, bottom suspension fagging 8, bracing piece 9, go up backup pad 10, elevating screw 11, elevator motor 12.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Example 1: the invention provides a preparation method of a drag-reducing and pour point-depressing bifunctional high-wax crude oil drag reducer, which comprises the following steps:
firstly, weighing 1kg of dried 5cm square small anti-drag polyalphaolefin solid, putting the solid into a liquid nitrogen barrel, ensuring that the liquid nitrogen submerges the anti-drag polymer, and keeping for 30 min; weighing 0.5kg of powdery ethylene-vinyl acetate copolymer EVA210, and then putting the powdery ethylene-vinyl acetate copolymer EVA210 into another liquid nitrogen barrel to keep for 15 min; coarsely crushing the drag reduction polyalphaolefin treated at low temperature, transferring the coarse powder to a ball mill for grinding, adding 0.5kg of EVA210 powder treated by liquid nitrogen (the mass ratio of the EVA210 powder to the drag reduction polyalphaolefin is 1: 2), adding 0.2kg of calcium stearate serving as a grinding aid, adding 0.1kg of needle-shaped paraffin serving as an isolating agent, and grinding at the temperature lower than-40 ℃ for 30min to ensure the grinding effect and the mixing effect; sieving the poly-alpha-olefin fine powder particles for drag reduction which are formed by ball milling and coated by EVA210 by a 120-mesh electric sieve to prepare a high-wax crude oil drag reducer powdery drying agent with double functions of drag reduction and pour point depression; the difunctional drag reducer powdery dry agent is dispersed into an oil-based, water-based or alcohol-based suspension system to obtain a slurry-like agent product of the difunctional high-wax crude oil drag reducer with drag reduction and pour point depression.
The invention provides a using method of a drag reduction and pour point depression dual-function high-wax crude oil drag reducer, which comprises the following steps:
according to the physical property, the technical requirement of drag reduction and the technical requirement of pour point depression of crude oil, selecting a difunctional drag reduction pasty drag reduction agent product which is suitable for the proportion of poly-alpha olefin and ethylene-vinyl acetate copolymer for drag reduction, filling at the outlet of a crude oil pipeline heat pump station according to the calculated dosage, wherein the temperature of the crude oil during filling is about 65 ℃, and after 30min, the ethylene-vinyl acetate copolymer coated outside drag reduction agent particles can be dissolved in the crude oil and interacts with paraffin, colloid and asphaltene in the crude oil to play the role of pour point depression, so that the crude oil can keep the fluidity at low temperature; then the drag reduction uses the poly-alpha-olefin to rapidly swell and influence the intensity of turbulence in a turbulence transition area in the pipeline through elastic deformation, and the drag reduction efficiency is exerted, thereby realizing the double functions of drag reduction and pour point depression.
Example 2: the invention provides a preparation method of a drag-reducing and pour point-depressing bifunctional high-wax crude oil drag reducer, which comprises the following steps:
firstly, weighing 1kg of dried 5cm square small anti-drag polyalphaolefin solid, putting the solid into a liquid nitrogen barrel, ensuring that the liquid nitrogen submerges the anti-drag polymer, and keeping for 40 min; weighing 1kg of powdery EVA210, and then putting the powdery EVA210 into another liquid nitrogen barrel to keep the powdery EVA for 20 min; coarsely crushing the drag reduction polyalphaolefin treated at low temperature, transferring the coarse powder to a ball mill for grinding, adding 1kg of EVA210 powder treated by liquid nitrogen (the mass ratio of the EVA210 powder to the drag reduction polyalphaolefin is 1: 1), adding 0.2kg of calcium stearate serving as a grinding aid, adding 0.1kg of needle paraffin serving as an isolating agent, and grinding at the temperature lower than-40 ℃ for 30min to ensure the grinding effect and the mixing effect; sieving the poly-alpha-olefin fine powder particles for drag reduction which are formed by ball milling and coated by EVA210 by a 120-mesh electric sieve to prepare a high-wax crude oil drag reducer powdery drying agent with double functions of drag reduction and pour point depression; the difunctional drag reducer powdery dry agent is dispersed into an oil-based, water-based or alcohol-based suspension system to obtain a slurry-like agent product of the difunctional high-wax crude oil drag reducer with drag reduction and pour point depression.
The invention provides a using method of a drag reduction and pour point depression dual-function high-wax crude oil drag reducer, which comprises the following steps:
according to the physical property, the technical requirement of drag reduction and the technical requirement of pour point depression of crude oil, selecting a difunctional drag reduction pasty drag reduction agent product which is suitable for the proportion of poly-alpha olefin and ethylene-vinyl acetate copolymer for drag reduction, filling at the outlet of a crude oil pipeline heat pump station according to the calculated dosage, wherein the temperature of the crude oil during filling is about 65 ℃, and after 30min, the ethylene-vinyl acetate copolymer coated outside drag reduction agent particles can be dissolved in the crude oil and interacts with paraffin, colloid and asphaltene in the crude oil to play the role of pour point depression, so that the crude oil can keep the fluidity at low temperature; then the drag reduction uses the poly-alpha-olefin to rapidly swell and influence the intensity of turbulence in a turbulence transition area in the pipeline through elastic deformation, and the drag reduction efficiency is exerted, thereby realizing the double functions of drag reduction and pour point depression.
Example 3: the invention provides a preparation method of a drag-reducing and pour point-depressing bifunctional high-wax crude oil drag reducer, which comprises the following steps:
firstly, weighing 1kg of dried 5cm square small anti-drag polyalphaolefin solid, putting the solid into a liquid nitrogen barrel, ensuring that the liquid nitrogen submerges the anti-drag polymer, and keeping for 50 min; weighing 0.34kg of powdery EVA210, and then placing the powdery EVA210 into another liquid nitrogen barrel to keep for 10 min; coarsely crushing the drag reduction polyalphaolefin treated at low temperature, transferring the coarse powder to a ball mill for grinding, adding 0.5kg of EVA210 powder treated by liquid nitrogen (the mass ratio of the EVA210 powder to the drag reduction polyalphaolefin is 1: 3), adding 0.2kg of calcium stearate serving as a grinding aid, adding 0.1kg of needle-shaped paraffin serving as an isolating agent, and grinding at the temperature lower than-40 ℃ for 30min to ensure the grinding effect and the mixing effect; sieving the poly-alpha-olefin fine powder particles for drag reduction which are formed by ball milling and coated by EVA210 by a 120-mesh electric sieve to prepare a high-wax crude oil drag reducer powdery drying agent with double functions of drag reduction and pour point depression; the difunctional drag reducer powdery dry agent is dispersed into an oil-based, water-based or alcohol-based suspension system to obtain a slurry-like agent product of the difunctional high-wax crude oil drag reducer with drag reduction and pour point depression.
The invention provides a using method of a drag reduction and pour point depression dual-function high-wax crude oil drag reducer, which comprises the following steps:
according to the physical property, the technical requirement of drag reduction and the technical requirement of pour point depression of crude oil, selecting a difunctional drag reduction pasty drag reduction agent product which is suitable for the proportion of poly-alpha olefin and ethylene-vinyl acetate copolymer for drag reduction, filling at the outlet of a crude oil pipeline heat pump station according to the calculated dosage, wherein the temperature of the crude oil during filling is about 65 ℃, and after 30min, the ethylene-vinyl acetate copolymer coated outside drag reduction agent particles can be dissolved in the crude oil and interacts with paraffin, colloid and asphaltene in the crude oil to play the role of pour point depression, so that the crude oil can keep the fluidity at low temperature; then the drag reduction uses the poly-alpha-olefin to rapidly swell and influence the intensity of turbulence in a turbulence transition area in the pipeline through elastic deformation, and the drag reduction efficiency is exerted, thereby realizing the double functions of drag reduction and pour point depression.
Example 4: the invention provides a preparation method of a drag-reducing and pour point-depressing bifunctional high-wax crude oil drag reducer, which comprises the following steps:
firstly, weighing 1kg of dried 5cm square small anti-drag polyalphaolefin solid, putting the solid into a liquid nitrogen barrel, ensuring that the liquid nitrogen submerges the anti-drag polymer, and keeping for 30 min; weighing 0.5kg of powdery EVA220, and then putting the powdery EVA into another liquid nitrogen barrel to keep for 15 min; coarsely crushing the drag reduction polyalphaolefin treated at low temperature, transferring the coarse powder to a ball mill for grinding, adding 0.5kg of EVA220 powder treated by liquid nitrogen (the mass ratio of the EVA220 powder to the drag reduction polyalphaolefin is 1: 2), adding 0.2kg of stearic anhydride as a grinding aid, adding 0.1kg of liquid paraffin as an isolating agent, and grinding at the temperature lower than-40 ℃ for 30min to ensure the grinding effect and the mixing effect; sieving the poly-alpha-olefin fine powder particles for drag reduction which are formed by ball milling and coated by EVA220 by a 120-mesh electric sieve to prepare a high-wax crude oil drag reducer powdery drying agent with double functions of drag reduction and pour point depression; the difunctional drag reducer powdery dry agent is dispersed into an oil-based, water-based or alcohol-based suspension system to obtain a slurry-like agent product of the difunctional high-wax crude oil drag reducer with drag reduction and pour point depression.
The invention provides a using method of a drag reduction and pour point depression dual-function high-wax crude oil drag reducer, which comprises the following steps:
according to the physical property, the technical requirement of drag reduction and the technical requirement of pour point depression of crude oil, selecting a difunctional drag reduction pasty drag reduction agent product which is suitable for the proportion of poly-alpha olefin and ethylene-vinyl acetate copolymer for drag reduction, filling at the outlet of a crude oil pipeline heat pump station according to the calculated dosage, wherein the temperature of the crude oil during filling is about 65 ℃, and after 30min, the ethylene-vinyl acetate copolymer coated outside drag reduction agent particles can be dissolved in the crude oil and interacts with paraffin, colloid and asphaltene in the crude oil to play the role of pour point depression, so that the crude oil can keep the fluidity at low temperature; then the drag reduction uses the poly-alpha-olefin to rapidly swell and influence the intensity of turbulence in a turbulence transition area in the pipeline through elastic deformation, and the drag reduction efficiency is exerted, thereby realizing the double functions of drag reduction and pour point depression.
Example 5: the invention provides a preparation method of a drag-reducing and pour point-depressing bifunctional high-wax crude oil drag reducer, which comprises the following steps:
firstly, weighing 1kg of dried 5cm square small anti-drag polyalphaolefin solid, putting the solid into a liquid nitrogen barrel, ensuring that the liquid nitrogen submerges the anti-drag polymer, and keeping for 50 min; weighing 0.5kg of powdery EVA310, and then putting the powdery EVA310 into another liquid nitrogen barrel to keep for 15 min; coarsely crushing the drag reduction polyalphaolefin treated at low temperature, transferring the coarse powder to a ball mill for grinding, adding 0.5kg of EVA310 powder treated by liquid nitrogen (the mass ratio of the EVA310 powder to the drag reduction polyalphaolefin is 1: 2), adding 0.2kg of stearic anhydride as a grinding aid, adding 0.1kg of liquid paraffin as an isolating agent, and grinding at the temperature lower than-40 ℃ for 30min to ensure the grinding effect and the mixing effect; sieving the poly-alpha-olefin fine powder particles for drag reduction formed by ball milling and coated by EVA310 by a 120-mesh electric sieve to prepare a high-wax crude oil drag reducer powdery drying agent with double functions of drag reduction and pour point depression; the difunctional drag reducer powdery dry agent is dispersed into an oil-based, water-based or alcohol-based suspension system to obtain a slurry-like agent product of the difunctional high-wax crude oil drag reducer with drag reduction and pour point depression.
The invention provides a using method of a drag reduction and pour point depression dual-function high-wax crude oil drag reducer, which comprises the following steps:
according to the physical property, the technical requirement of drag reduction and the technical requirement of pour point depression of crude oil, selecting a difunctional drag reduction pasty drag reduction agent product which is suitable for the proportion of poly-alpha olefin and ethylene-vinyl acetate copolymer for drag reduction, filling at the outlet of a crude oil pipeline heat pump station according to the calculated dosage, wherein the temperature of the crude oil during filling is about 65 ℃, and after 30min, the ethylene-vinyl acetate copolymer coated outside drag reduction agent particles can be dissolved in the crude oil and interacts with paraffin, colloid and asphaltene in the crude oil to play the role of pour point depression, so that the crude oil can keep the fluidity at low temperature; then the drag reduction uses the poly-alpha-olefin to rapidly swell and influence the intensity of turbulence in a turbulence transition area in the pipeline through elastic deformation, and the drag reduction efficiency is exerted, thereby realizing the double functions of drag reduction and pour point depression.
Effect test of the invention (Experimental test drag reducer concentration 50 ppm)
(1) Method for testing disc onset time
The rotation speed of the disc is adjusted, the Reynolds number of fluid is changed, the fluid resistance is calculated through data collected by the torque sensor, the drag reduction rate is calculated through the change of the flow resistance before and after the addition of the agent, and whether the acting time of the EVA-coated drag reducer changes or not is judged through the difference of drag reduction effects at different times. A rotary disc system (refer to an attached figure 1) is adopted, the rotary disc testing system comprises a constant-temperature water bath 1, a coupler 2, a torque sensor 3, a speed regulating motor 4, a data line 5, a computer 6, a sample groove 7, a lower supporting plate 8, a supporting rod 9, an upper supporting plate 10, a lifting screw rod 11 and a lifting motor 12, wherein one side of the lower supporting plate 8 is connected with the upper supporting plate 10 through the supporting rod 9, the constant-temperature water bath 1 is arranged on the lower supporting plate 8, and the sample groove 7 is arranged on the constant-temperature water bath 1; a speed regulating motor 4 is arranged on the upper supporting plate 10, the lower part of the speed regulating motor 4 is connected with a coupler 2 and a torque sensor 3, and the torque sensor 3 is connected to a computer 6 through a data line 5; in addition, be equipped with elevating screw 11 in the bracing piece 9, and elevating screw 11's top is equipped with elevator motor 12, through the height and the position of elevator motor 12 adjustment upper support plate.
When the temperature of the experimental crude oil is 65 ℃, the effect time of the drag reduction performance of the drag reducer sold in the market and the drag reducer in each embodiment is compared through a rotating disc test, and the following can be seen: the onset time of 5 samples of the examples is not much different from that of the commercial product, and the change of the thickness of the coating layer caused by the addition amount of the EVA slightly improves the onset time within the specification range, but does not influence the use of the drag reducer.
(2) Standard and method for testing resistance reduction effect of loop
According to a standard indoor test method SY/T6578-2009 for the drag reduction effect of the oil pipeline drag reducer, in the actual test process, the drag reduction effect of the dual-function drag reducer is judged by changing the bubbling dispersion and unification of nitrogen, determining the time to be 40min, testing the temperature to be 35 ℃, and evaluating the steady-state drag reduction effect.
Through the drag reduction effect of a loop test, the drag reduction performance of the drag reducer of 5 embodiments can basically achieve the same effect as that of the drag reducer sold in the market.
(3) Pour point depressing performance test standard and method
According to the standard GB/T3535 & lt & gt pour point determination method for petroleum products & gt, the difunctional drag reducer is added into a high-wax crude oil sample according to the concentration of 50ppm, the mixture is stirred at the temperature of 65 ℃ for 30min at a slow speed, then temperature programming treatment is carried out, and then pour point testing is carried out, so that the pour point reducing effect of the difunctional drag reducer is judged.
Through the pour point depression effect test, the drag reduction and pour point depression dual-function high-wax crude oil drag reducer of 5 embodiments has obvious pour point depression effect, can reduce the pour point by 13.2 ℃ at most and can generally reduce the pour point by 8 ℃.
In the embodiment, because the EVA is added to play a role in isolation and coating, a coating layer is formed on the surface of the drag-reduction poly-alpha-olefin particles, and in crude oil, the EVA is firstly dissolved and then dispersed, and interacts with paraffin, colloid, asphaltene and the like, so that the original condensation point and pour point are effectively reduced; after EVA is dissolved and dispersed, the poly-alpha-olefin drag reducer particles are dispersed into crude oil, and the turbulence intensity is interfered by the deformation of microscopic molecules, so that the drag reduction effect is exerted; the two components have different functions in the crude oil for different objects, and the effects of drag reduction and pour point depression and application effect synergistic enhancement are realized.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
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Application publication date: 20200508 Assignee: Shandong Zhongke Industry Research Institute Technology Transfer Co.,Ltd. Assignor: Shandong Institute of petroleum and chemical engineering Contract record no.: X2024980017257 Denomination of invention: Preparation method of high wax crude oil drag reducer with dual functions of drag reduction and pour point reduction Granted publication date: 20210514 License type: Common License Record date: 20241010 Application publication date: 20200508 Assignee: Dongying Jiangyuan Chemical Co.,Ltd. Assignor: Shandong Institute of petroleum and chemical engineering Contract record no.: X2024980017093 Denomination of invention: Preparation method of high wax crude oil drag reducer with dual functions of drag reduction and pour point reduction Granted publication date: 20210514 License type: Common License Record date: 20241008 Application publication date: 20200508 Assignee: DONGYING GUOAN CHEMICAL Co.,Ltd. Assignor: Shandong Institute of petroleum and chemical engineering Contract record no.: X2024980017090 Denomination of invention: Preparation method of high wax crude oil drag reducer with dual functions of drag reduction and pour point reduction Granted publication date: 20210514 License type: Common License Record date: 20241008 |