CN102109094B - Method for pipeline conveying technology of wax-containing crude added with viscocity and coagulation-reducing composition - Google Patents
Method for pipeline conveying technology of wax-containing crude added with viscocity and coagulation-reducing composition Download PDFInfo
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- CN102109094B CN102109094B CN 200910243237 CN200910243237A CN102109094B CN 102109094 B CN102109094 B CN 102109094B CN 200910243237 CN200910243237 CN 200910243237 CN 200910243237 A CN200910243237 A CN 200910243237A CN 102109094 B CN102109094 B CN 102109094B
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- 239000000203 mixture Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005516 engineering process Methods 0.000 title abstract description 14
- 230000009467 reduction Effects 0.000 claims abstract description 53
- 238000001556 precipitation Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000010779 crude oil Substances 0.000 claims description 94
- 238000001816 cooling Methods 0.000 claims description 13
- 238000004458 analytical method Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 2
- 239000003502 gasoline Substances 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 15
- 230000001603 reducing effect Effects 0.000 abstract description 6
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- 239000003208 petroleum Substances 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000009775 high-speed stirring Methods 0.000 abstract 1
- 230000000994 depressogenic effect Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000003921 oil Substances 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 1
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- 230000002950 deficient Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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Abstract
The invention relates to a method for a pipeline conveying technology of wax-containing crude added with a viscocity and coagulation-reducing composition, and relates to the technical field of petroleum industry and pipeline systems. The method for the pipeline conveying technology is characterized in that 1) the temperature of crude pretreatment is higher than the crude wax precipitation point; 2) the adding concentration of the viscocity and coagulation-reducing composition is 0.005wt%-0.05wt%; 3) the pretreatment final cold temperature of the added viscocity and coagulation-reducing composition crude is lower than the crude wax precipitation peak temperature; 4) the added viscocity and coagulation-reducing composition crude keeps a certain temperature reduction speed rate; 5) the adding temperature of the viscocity and coagulation-reducing composition is higher than the crude wax precipitation peak temperature; 6) the mixing of the wax-containing crude added with the viscocity and coagulation-reducing composition requires high-speed stirring; and 7) the reduplication heating temperature of the crude after treatment is lower than the crude wax precipitation point temperature. The method for the pipeline conveying technology of the wax-containing crude added with the viscocity and coagulation-reducing composition provided by the invention has the advantages of wide range of application, small low-temperature rheological impact caused by crude temperature recovery, good timeliness of dynamic and static state stability, less deposition of the crude in a pipeline, and more obvious viscocity reducing effect.
Description
Technical field
The present invention is the defeated technological method of pipe that a kind of waxy crude oil adds viscosity reduction pour point depression composition.Relate to petroleum industry and pipe-line system technical field.
Background technique
That most of crude oil that China produced belongs to is high sticking, the high wax content oil of Gao Ning.Because the low temperature rheological properties of this quasi-oil is relatively poor, so the crude oil pipeline of China mostly adopts the heating delivery technology.The heating delivery technology not only will consume a large amount of fuel oil and power, and behind pipeline shutdown, will there be bigger insecurity in restarting of its pipeline.Meanwhile some crude oil pipeline of China is in low throughput rate operation, and pipeline heating facility scarce capacity, pipeline operation energy consumption rise and Security descends, and section of tubing has to take the positive and negative line mode that transports.The China Petroleum Pipeline research center is by the rheol basic theories of the crude oil of having set up; To the brilliant dissolving of wax in the crude oil with separate out the microexamination and the Research on experimental methods of crystallization process; The condensation point of crude oil and the apparent viscosity under the cryogenic conditions are reduced greatly; Make crude oil manage the flowability under the defeated condition and stop defeated restartability behavior and well improved; Formed a new oil transportation technology---heat treatment delivery technology thus, and successfully heat treatment technology has been applied in the improvement of rheological characteristic of crude oil and rheological behaviour.Through using this technology, in service in low throughput pipeline, need not increase newly under the prerequisite of pipeline heating plant, realized crude oil in the heat treatment in initial station, the delivery technology that midship no longer heats has guaranteed that the safety economy of pipeline is carried.In order to increase the stability behind the crude oil modifying; China Research on The Rheology person is in the experience of using for reference external diesel fuel applications pour-point depressant; Successfully pour-point depressant is applied on the low temperature rheological behaviour that improves waxy crude oil; And combine the crude oil heat treatment method to select to add the agent treatment temperature and the type of cooling; Pour-point depressant is performed to ultimate attainment to the modifying function of crude oil, thereby formed the crude oil modifying new method that is called " adding the agent integrated treatment ", perhaps add the pour-point depressant method all has bigger advantage and stability to this method than single employing heat treatment.However, comprehensively add agent and handle still existence deficiency:
The one, pour-point depressant is pointed, and different crude oils is suitable for the variety classes pour-point depressant, does not find desirable pour-point depressant to Daqing oil so far;
The 2nd, under the integrated treatment condition, crude oil temperature gos up bigger to the low temperature rheological behaviour influence, exists temperature recovery to worsen the district;
The 3rd, after the waxy crude oil integrated treatment dynamically and statically stablely ageingly can't satisfy the pipe safety operating conditions;
The 4th, the adding of pour-point depressant causes the deposition of wax in the pipeline to increase.
Summary of the invention
The objective of the invention is to invent that a kind of Applicable scope is wide, the oil temperature is gone up is little to the low temperature rheological behaviour influence, dynamically reach statically stable ageing good, the defeated technological method of pipe that the more significant waxy crude oil of viscosity reducing effect adds viscosity reduction pour point depression composition.
The present invention adopts crude oil heat treatment to add the integrated conduct method of viscosity reduction pour point depression composition.The process conditions of interpolation viscosity reduction pour point depression composition mainly comprise: the repetition heating-up temperature again of the interpolation concentration of crude oil pre-heating temperature, viscosity reduction pour point depression composition, the pretreatment final cooling temperature control of adding viscosity reduction pour point depression composition, the cooling rate that adds viscosity reduction pour point depression composition crude oil, the interpolation temperature of viscosity reduction pour point depression composition, the mixing whipped form that adds viscosity reduction pour point depression composition, processing back crude oil etc.
Waxy crude oil adds the adding technology flow process of viscosity reduction pour point depression composition:
1. the crude oil pre-heating temperature is that crude oil has the important process condition of fine low temperature flowability after guaranteeing to add viscosity reduction pour point depression compositions-treated, and pretreatment temperature should be higher than the crude oil wax precipitation point;
2. the interpolation concentration of viscosity reduction pour point depression composition is second critical process condition of whole process treatment process, and the interpolation concentration of viscosity reduction pour point depression composition is 0.005%～0.05% concentration expressed in percentage by weight;
3. adding viscosity reduction pour point depression composition Crude Oil Pretreatment final cooling temperature should be lower than crude oil and analyse the high peak temperature of wax;
4. add viscosity reduction pour point depression composition crude oil and keep certain cooling rate;
5. the interpolation temperature of viscosity reduction pour point depression composition should be higher than waxy crude oil and analyses the high peak temperature of wax;
6. high-speed stirred is wanted in the mixing of waxy crude oil interpolation viscosity reduction pour point depression composition;
7. the repetition heating-up temperature again of handling back crude oil is lower than crude oil wax precipitation point temperature.
Wherein:
When in crude oil, adding this viscosity reduction pour point depression composition, can directly product be injected in the crude oil and use; Also can be with 0.1%～10% ratio under agitation with reducing crude oil viscosity pour point depression composition; Be dispersed in advance 50～90 ℃ of crude oil, diesel oil, kerosene, gasoline or other can with the organic liquid solvent of crude oil mixing in; Form concentrated suspension liquid, and then be injected in the crude oil in proportion;
Interpolation viscosity reduction pour point depression composition Crude Oil Pretreatment final cooling temperature should be lower than crude oil and analyse 10 ℃～15 ℃ of the high peak temperatures of wax;
More than the 2 ℃/min of cooling rate of interpolation viscosity reduction pour point depression composition crude oil reaches;
The interpolation temperature of viscosity reduction pour point depression composition should be higher than waxy crude oil and analyse 10 ℃ of high peak temperatures of wax and above adding;
The mixing stir speed (S.S.) that waxy crude oil adds viscosity reduction pour point depression composition is higher than the above high-speed stirred 5min of 1500rpm/min～10min;
The repetition heating-up temperature again of handling back crude oil is lower than 5～10 ℃ of crude oil wax precipitation point temperature.
The heating crude oil of required modification is arrived pretreatment temperature; After quantitative adding viscosity reduction pour point depression composition and crude oil fully mix; Be cooled to 15 ℃ according to certain mixing speed chilling, and then crude oil is warming up to once more below 35 ℃ after will handling, the low temperature flow of its crude oil will well be improved; Handle back crude oil simultaneously and have static state and dynamic stability preferably, keep the ageing of low temperature flowability to reach more than eight days.
Adopt the viscosity reduction pour point depression composition of nanometer technology can improve waxy crude oil is failed fluid under the cryogenic conditions at pipe static state, dynamic stability and ageing; Improve the Security that stops defeated restartability behavior; Applicable other waxy crude oil of while viscosity reduction pour point depression composition of the same race, applicability is strong, has remedied the defective that adds the agent integrated treatment; Improve its deficiency, optimize its result.
Waxy crude oil of the present invention adds the adding technology of viscosity reduction pour point depression composition and compares with existing pour-point depressant adding technology; The former is lower than the latter for the Crude Pre temperature, adding the crude oil temperature drop rate that falls glutinous pour point depression composition, the former is faster than the latter; Its viscosity reducing effect highly significant, and dynamic and static ageing better.With add the agent comprehensive treatment technique and compare advantage and be: viscosity reducing effect has good timeliness and stability, and viscosity reduction pour point depression composition Applicable scope is bigger.
Embodiment
Embodiment. this example is to do pilot scale to the modification of Daqing crude oil and in test track.The condensation point of Daqing crude oil is 32 ℃, and wax precipitation point is 46 ℃, and viscosity is in 100mPa.s.
1. the crude oil pre-heating temperature is 60 ℃;
2. viscosity reduction pour point depression composition is 0.005% concentration expressed in percentage by weight by adding concentration, directly is injected in the crude oil;
3. adding viscosity reduction pour point depression composition Crude Oil Pretreatment final cooling temperature is 15 ℃;
4. add the 4.5 ℃/min of cooling rate of viscosity reduction pour point depression composition crude oil;
5. 30-35 ℃ of the interpolation temperature of viscosity reduction pour point depression composition;
6. waxy crude oil adds the mixing stir speed (S.S.) 1500rpm/min stirring 10min of viscosity reduction pour point depression composition;
7. the repetition heating-up temperature again of handling back crude oil is lower than 35 ℃.
This example to the modified effect of Daqing crude oil is: can keep dynamic and static stabilization time more than 8 days, viscosity of crude changes≤5% in dynamic and static stabilization time; Daqing crude oil after this process treating can be carried more than the 800Km, has reduced energy consumption greatly, has reduced cost, and is safe and reliable.The deposition that to prove that Applicable scope of the present invention is wide, oil temperature is gone up little to the low temperature rheological behaviour influence, dynamically reach wax in statically stable ageing good, the pipeline is little, viscosity reducing effect is more remarkable.
Claims (7)
1. a waxy crude oil adds the defeated technological method of pipe of viscosity reduction pour point depression composition, it is characterized in that:
1) the Crude Pre temperature should be higher than the crude oil wax precipitation point;
2) the interpolation concentration of viscosity reduction pour point depression composition is 0.005%～0.05% concentration expressed in percentage by weight;
3) adding viscosity reduction pour point depression composition Crude Oil Pretreatment final cooling temperature should be lower than crude oil and analyse the high peak temperature of wax;
4) add viscosity reduction pour point depression composition crude oil and keep certain cooling rate;
5) the interpolation temperature of viscosity reduction pour point depression composition should be higher than waxy crude oil and analyses the high peak temperature of wax;
6) high-speed stirred is wanted in the mixing of waxy crude oil interpolation viscosity reduction pour point depression composition;
7) the repetition heating-up temperature again of processing back crude oil is lower than crude oil wax precipitation point temperature.
2. waxy crude oil according to claim 1 adds the defeated technological method of pipe of viscosity reduction pour point depression composition, it is characterized in that said interpolation viscosity reduction pour point depression composition Crude Oil Pretreatment final cooling temperature should be lower than crude oil and analyse 10 ℃～15 ℃ of the high peak temperatures of wax.
3. waxy crude oil according to claim 1 adds the defeated technological method of pipe of viscosity reduction pour point depression composition, when it is characterized in that in crude oil, adding viscosity reduction pour point depression composition, or directly viscosity reduction pour point depression composition is injected in the crude oil and uses; Or with the ratio of weight percentage 0.1%～10% under agitation with viscosity reduction pour point depression composition; Be dispersed in advance 50～90 ℃ of crude oil, diesel oil, kerosene, gasoline or other can with the organic liquid solvent of crude oil mixing in; Form concentrated suspension liquid, and then be injected in the crude oil in proportion.
4. waxy crude oil according to claim 1 adds the defeated technological method of pipe of viscosity reduction pour point depression composition, it is characterized in that said interpolation viscosity reduction pour point depression composition crude oil 2 ℃/min of cooling rate and more than.
5. waxy crude oil according to claim 1 adds the defeated technological method of pipe of viscosity reduction pour point depression composition, and the interpolation temperature that it is characterized in that said viscosity reduction pour point depression composition should be higher than waxy crude oil and analyse 10 ℃ of high peak temperatures of wax and above adding.
6. waxy crude oil according to claim 1 adds the defeated technological method of pipe of viscosity reduction pour point depression composition, and the mixing stir speed (S.S.) that it is characterized in that said waxy crude oil interpolation viscosity reduction pour point depression composition is at the above high-speed stirred 5min of 1500rpm/min～10min.
7. waxy crude oil according to claim 1 adds the defeated technological method of pipe of viscosity reduction pour point depression composition, it is characterized in that the said repetition heating-up temperature again of handling back crude oil is lower than 5～10 ℃ of crude oil wax precipitation point temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910243237 CN102109094B (en) | 2009-12-29 | 2009-12-29 | Method for pipeline conveying technology of wax-containing crude added with viscocity and coagulation-reducing composition |
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| CN 200910243237 CN102109094B (en) | 2009-12-29 | 2009-12-29 | Method for pipeline conveying technology of wax-containing crude added with viscocity and coagulation-reducing composition |
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| CN102109094A CN102109094A (en) | 2011-06-29 |
| CN102109094B true CN102109094B (en) | 2012-12-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104154422A (en) * | 2014-07-15 | 2014-11-19 | 中国石油天然气股份有限公司 | Crude oil pour-point-reducing and viscosity-reducing nanometer base material compound, preparation method thereof and crude oil |
| CN107435816B (en) * | 2016-05-26 | 2019-04-16 | 中国石油大学(北京) | It is a kind of to make easily to coagulate the glutinous integrated conduct method of high tack coat product pour point depression drop |
| CN107011937A (en) * | 2017-04-25 | 2017-08-04 | 中国石油大学(华东) | A kind of waxy crude oil rheological characteristic ameliorative way |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3853356A (en) * | 1973-08-23 | 1974-12-10 | Marathon Oil Co | Method of pumping waxy crude oil |
| CN1146540A (en) * | 1996-06-27 | 1997-04-02 | 徐长安 | Flow-controlled crude oil pipe-conveying method |
| CN1598393A (en) * | 2004-03-09 | 2005-03-23 | 辽河石油勘探局 | Integrated method of condensed oil reducing viscosity, recovering, collecting transporting |
| CN101117574A (en) * | 2007-07-17 | 2008-02-06 | 华东理工大学 | Thermostable super-heavy crude viscosity-reducing agent and preparation and using method thereof |
-
2009
- 2009-12-29 CN CN 200910243237 patent/CN102109094B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3853356A (en) * | 1973-08-23 | 1974-12-10 | Marathon Oil Co | Method of pumping waxy crude oil |
| CN1146540A (en) * | 1996-06-27 | 1997-04-02 | 徐长安 | Flow-controlled crude oil pipe-conveying method |
| CN1598393A (en) * | 2004-03-09 | 2005-03-23 | 辽河石油勘探局 | Integrated method of condensed oil reducing viscosity, recovering, collecting transporting |
| CN101117574A (en) * | 2007-07-17 | 2008-02-06 | 华东理工大学 | Thermostable super-heavy crude viscosity-reducing agent and preparation and using method thereof |
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Effective date of registration: 20211110 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 China Petroleum Building, No. 9, Dongzhimen North Street, Dongcheng District, Beijing Patentee before: PetroChina Company Limited |
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