CN108690589B - Oil well blocking remover and preparation method and application thereof - Google Patents
Oil well blocking remover and preparation method and application thereof Download PDFInfo
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- CN108690589B CN108690589B CN201810546981.8A CN201810546981A CN108690589B CN 108690589 B CN108690589 B CN 108690589B CN 201810546981 A CN201810546981 A CN 201810546981A CN 108690589 B CN108690589 B CN 108690589B
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- 239000003129 oil well Substances 0.000 title claims abstract description 95
- 230000000903 blocking effect Effects 0.000 title claims abstract description 88
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 22
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 15
- 239000003350 kerosene Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims description 17
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 13
- CKNOIIXFUKKRIC-HZJYTTRNSA-N (9z,12z)-n,n-bis(2-hydroxyethyl)octadeca-9,12-dienamide Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(=O)N(CCO)CCO CKNOIIXFUKKRIC-HZJYTTRNSA-N 0.000 claims description 9
- LPMBTLLQQJBUOO-KTKRTIGZSA-N (z)-n,n-bis(2-hydroxyethyl)octadec-9-enamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)N(CCO)CCO LPMBTLLQQJBUOO-KTKRTIGZSA-N 0.000 claims description 9
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 9
- 239000000194 fatty acid Substances 0.000 claims description 9
- 229930195729 fatty acid Natural products 0.000 claims description 9
- 239000008096 xylene Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- -1 sorbitan fatty acid ester Chemical class 0.000 claims description 7
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 6
- HVUMOYIDDBPOLL-XGKPLOKHSA-N [2-[(2r,3r,4s)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XGKPLOKHSA-N 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 claims description 4
- 239000001587 sorbitan monostearate Substances 0.000 claims description 4
- 229940035048 sorbitan monostearate Drugs 0.000 claims description 4
- 235000011076 sorbitan monostearate Nutrition 0.000 claims description 4
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 claims 2
- 239000003849 aromatic solvent Substances 0.000 claims 2
- 150000002148 esters Chemical class 0.000 claims 2
- 150000004665 fatty acids Chemical class 0.000 claims 2
- 239000000446 fuel Substances 0.000 claims 1
- 239000000084 colloidal system Substances 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 9
- 239000013049 sediment Substances 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 15
- 238000004090 dissolution Methods 0.000 description 11
- 230000008021 deposition Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000003960 organic solvent Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 150000001491 aromatic compounds Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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Abstract
The invention provides an oil well blocking remover and a preparation method and application thereof. The blocking remover comprises the following raw material components by taking the total weight of the blocking remover as 100 percent: 30 to 45 percent of aromatic hydrocarbon solvent, 30 to 45 percent of kerosene, 15 to 20 percent of oil-soluble penetrating agent and 5 to 10 percent of nonionic surfactant. Compared with the existing oil well blocking remover, the oil well blocking remover has the advantages that the opening flash point reaches more than 50 ℃, the safety is good, the preparation process is simple, the blocking removing efficiency on asphaltene and colloid sediments is high, the solution after blocking removing can directly enter a ground manifold system without being discharged, the oil well blocking remover is safe and environment-friendly, and the oil well blocking remover is suitable for blocking removing of oil wells and blocking objects in the area close to the well during the oil well exploitation process.
Description
Technical Field
The invention belongs to the technical field of oilfield chemical additives, and particularly relates to an oil well blocking remover and a preparation method and application thereof.
Background
Oil and gas system solid phase deposition has always been a serious problem facing the petroleum industry. The deposition of organic solids may occur in various production stages of oil and gas production. The problems caused by organic matter deposition can be summarized in the following aspects: (1) the pressure drop is greatest when crude oil enters the wellbore or perforation from the formation, and thus asphaltene deposition is more severe in the near-wellbore and perforations. (2) Deposition in the formation tunnels causes poor rock permeability, resulting in reduced productivity. (3) Deposits in wellbores and downhole equipment, surface pipelines, vessels, equipment, cause increased flow resistance and even plugging, and reduce the efficiency of production.
In the process of oil exploitation, after oil reservoir fluid is extracted, when the oil reservoir fluid reaches a certain depth along a shaft or reaches the ground, due to the reduction of temperature and pressure and the change of system composition, organic solid-phase substances such as wax, colloid, asphaltene and the like are deposited. The solid deposition phenomenon can be frequently observed in the well bottom and the shaft, the deposited solid-phase substance blocks the production well, the pressure gradient of fluid flow is increased, and the oil well yield is greatly reduced, and even stops production in severe cases. Therefore, effective blockage removal and prevention measures for the deposition of the asphaltene in the crude oil are very important. The method for removing the blockage of the oil well commonly used at present is to inject a solvent or a dispersant into the oil well, the commonly used solvent is aromatic compounds such as benzene, toluene, xylene and the like, wherein the xylene has the best dissolving effect, but the solvents have the problems of large solvent consumption, short treatment effect maintaining time, environmental pollution and the like when being used on site. Therefore, a novel oil well blocking remover is developed, the content of volatile organic solvent is reduced as much as possible, and the purposes of safety, low toxicity, environmental protection and good blocking removing effect are achieved. Ideally, the solution after plugging removal can directly enter a ground manifold system along with well flow after well opening without being discharged.
Disclosure of Invention
Based on the technical problems of the blocking remover in the prior art, the invention aims to provide an oil well blocking remover and a preparation method thereof; the oil well blocking remover has high dissolving efficiency on plugs such as colloid, asphaltene and the like, is safe and environment-friendly, and is simple and convenient to construct. The invention also aims to provide the application of the oil well blocking remover in the blockage removal of the oil well blockage in the oil well exploitation process; the problem of colloid and asphaltene blockage of high-temperature and high-pressure deep well oil pipes and near-wellbore zones can be solved, and the solution after blockage removal can directly enter a ground manifold system along with well flow after well opening without flowback.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the invention provides an oil well blocking remover, which comprises the following raw material components by taking the total weight of the blocking remover as 100 percent:
in the oil well blocking remover, the aromatic hydrocarbon solvent may preferably comprise aromatic hydrocarbon solvent oil S-100 and/or xylene, etc.
In the oil well blocking remover, preferably, the aromatic hydrocarbon solvent is a composition of aromatic hydrocarbon solvent oil S-100 and xylene; wherein the mass ratio of the aromatic hydrocarbon solvent oil S-100 to the dimethylbenzene is 2: 1.
In the above oil well blocking remover, preferably, the kerosene may include aviation kerosene and the like.
In the oil well blocking remover, the oil-soluble penetrant may preferably include oleic acid diethanolamide and/or linoleic acid diethanolamide, and the like.
In the oil well blocking remover, the oil-soluble penetrant is preferably a composition of oleic acid diethanolamide and linoleic acid diethanolamide; more preferably, the mass ratio of the oleic acid diethanolamide to the linoleic acid diethanolamide is from 3:1 to 1: 3.
In the above oil well blocking remover, preferably, the nonionic surfactant may include sorbitan monostearate (Span60) and/or sorbitan fatty acid ester (Span80) and the like.
In the oil well blocking remover, the nonionic surfactant is preferably a combination of sorbitan monostearate and sorbitan fatty acid ester; more preferably, the mass ratio of the sorbitan monostearate to the sorbitan fatty acid ester is from 2:1 to 1: 2.
On the other hand, the invention also provides a preparation method of the oil well blocking remover, which comprises the following steps:
the oil well blocking remover is obtained by mixing and stirring an aromatic hydrocarbon solvent, kerosene, an oil-soluble penetrating agent and a nonionic surfactant at a constant temperature.
In the above-mentioned preparation method, the stirring temperature at constant temperature is preferably 30 to 40 ℃.
In the above preparation method, the stirring time at constant temperature is preferably 1 to 2 hours.
In another aspect, the invention also provides the application of the oil well blocking remover in the blockage removal of the oil well blockage in the oil well exploitation process.
The main components of the oil well blocking remover are organic solvent, oil-soluble penetrant and nonionic surfactant. Aromatic hydrocarbon solvent and kerosene in the organic solvent can disperse and dissolve asphaltene and colloid molecules, and the interaction force among the molecules is weakened; the oil-soluble penetrating agent can help the organic solvent to quickly penetrate into the asphaltene and the colloid, so that the dissolving speed of the organic solvent is improved; the nonionic surfactant can prevent dissolved asphaltene and colloid molecules from reuniting, and prevent the asphaltene and the colloid from separating out again; the excellent blockage removing effect is shown through the synergistic effect among the raw material components.
Compared with the existing oil well blocking remover, the oil well blocking remover has the advantages that the opening flash point reaches more than 50 ℃, the safety is good, the preparation process is simple, the blocking removing efficiency on asphaltene and colloid sediments is high, the solution after blocking removing can directly enter a ground manifold system without being discharged, the oil well blocking remover is safe and environment-friendly, and the oil well blocking remover is suitable for blocking removing of oil wells and blocking objects in the area close to the well during the oil well exploitation process.
Drawings
FIG. 1 is a graph comparing production curves before and after the unblocking of a Kenzaya 7084 well in an application example of the present invention (construction time of 5 months and 6 days);
FIG. 2 is a graph comparing the production curves before and after the unblocking of the Kenyaku 8005 well in the application example of the present invention (6 months and 26 days of construction).
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention. The starting materials in the examples are all commercially available unless otherwise specified.
Example 1
The embodiment provides an oil well blocking remover, which comprises the following raw material components:
30% of an aromatic hydrocarbon solvent (a composition of S-100 and xylene in a mass ratio of 2: 1), 45% of aviation kerosene, 15% of an oil-soluble penetrating agent (a composition of oleic acid diethanolamide and linoleic acid diethanolamide in a mass ratio of 3: 1) and 10% of a nonionic surfactant (a composition of sorbitan monostearate (Span60) and sorbitan fatty acid ester (Span80) in a mass ratio of 2: 1).
The implementation also provides a preparation method of the oil well blocking remover, which comprises the following steps:
according to the raw materials and the proportion thereof, the aromatic hydrocarbon solvent, the aviation kerosene, the oil-soluble penetrating agent and the nonionic surfactant are added into a reaction kettle, and the mixture is stirred for 1 to 1.5 hours at the constant temperature of between 35 and 45 ℃ to obtain the oil well blocking remover.
The embodiment also provides application of the oil well blocking remover in blocking removal of oil well plugs in the oil well exploitation process.
The open flash point (according to ASTM D92 standard) of the oil well blocking remover was measured for the rate of dissolution of the blocking remover for the oil well plugs (the rate of dissolution is ═ the amount of dissolved oil well plugs divided by the amount of oil-based plugs added at the beginning) × 100%, 20mL of the oil well blocking remover of example 1 was weighed out, 2g of the oil well bore plugs under Kerkinje salt were added to the oil well blocking remover, and then statically dissolved at 80 ℃ (simulated in situ wellbore temperature) for 1-1.5h, and the rate of dissolution was calculated as shown in Table 1.
Example 2
The embodiment provides an oil well blocking remover, which comprises the following raw material components:
45% of an aromatic hydrocarbon solvent (composition with a mass ratio of S-100 to xylene of 2: 1), 30% of aviation kerosene, 20% of an oil-soluble penetrating agent (composition with a mass ratio of oleic diethanolamide to linoleic diethanolamide of 1: 1) and 5% of a nonionic surfactant (composition with a mass ratio of sorbitan monostearate (Span60) to sorbitan fatty acid ester (Span80) of 1: 1).
The implementation also provides a preparation method of the oil well blocking remover, which comprises the following steps:
according to the raw materials and the proportion thereof, the aromatic hydrocarbon solvent, the aviation kerosene, the oil-soluble penetrating agent and the nonionic surfactant are added into a reaction kettle, and the mixture is stirred for 1 to 1.5 hours at the constant temperature of between 35 and 45 ℃ to obtain the oil well blocking remover.
The embodiment also provides application of the oil well blocking remover in blocking removal of oil well plugs in the oil well exploitation process.
The open flash point (according to ASTM D92 standard) of the oil well blocking remover was measured for the rate of dissolution of the blocking remover for the oil well plugs (the rate of dissolution is ═ the amount of dissolved oil well plugs divided by the amount of oil-based plugs added at the beginning) × 100%, 20mL of the oil well blocking remover of example 2 was weighed out, 2g of the oil well bore plugs under Kerkinje salt were added to the oil well blocking remover, and then statically dissolved at 80 ℃ (simulated in situ bore temperature) for 1-1.5h, and the rate of dissolution was calculated as shown in Table 1.
Example 3
The embodiment provides an oil well blocking remover, which comprises the following raw material components:
40% of an aromatic hydrocarbon solvent (composition with a mass ratio of S-100 to xylene of 2: 1), 35% of aviation kerosene, 18% of an oil-soluble penetrating agent (composition with a mass ratio of oleic diethanolamide to linoleic diethanolamide of 1: 3) and 7% of a nonionic surfactant (composition with a mass ratio of sorbitan monostearate (Span60) to sorbitan fatty acid ester (Span80) of 1: 2).
The implementation also provides a preparation method of the oil well blocking remover, which comprises the following steps:
according to the raw materials and the proportion thereof, the aromatic hydrocarbon solvent, the aviation kerosene, the oil-soluble penetrating agent and the nonionic surfactant are added into a reaction kettle, and the mixture is stirred for 1 to 1.5 hours at the constant temperature of between 35 and 45 ℃ to obtain the oil well blocking remover.
The embodiment also provides application of the oil well blocking remover in blocking removal of oil well plugs in the oil well exploitation process.
The open flash point (according to ASTM D92 standard) of the oil well blocking remover was measured for the rate of dissolution of the blocking remover for the oil well plugs (the rate of dissolution is ═ the amount of dissolved oil well plugs divided by the amount of oil-based plugs added at the beginning) × 100%, 20mL of the oil well blocking remover of example 3 was weighed out, 2g of the oil well bore plugs under Kerkinje salt were added to the oil well blocking remover, and then statically dissolved at 80 ℃ (simulated in situ bore temperature) for 1-1.5h, and the rate of dissolution was calculated as shown in Table 1.
Table 1 examples 1-3 open flash point and static dissolution rate of oil well plug
From the experimental data in table 1, it can be seen that: the open flash point of the oil well blocking remover can reach more than 50 ℃, and the safety is good. The plugging removing agent has good plugging removing effect on oil well plugs such as asphaltene and colloid sediments, and the static dissolution rate of 1.5h is up to more than 98%.
Application example:
a well unblocking field test was performed on the field under kenkia salt in 2012 as in example 3. Two wells are illustrated as follows: the 7084 well is injected with 15 tons of blocking remover in 6 days after 5 months, the well is closed for 48 hours, the daily oil yield after opening the well is increased to 150t/d from 140t/d before blocking removal, the effective period is more than 4 months, and the effect is opposite before and after blocking removal as shown in figure 1. 8005 the well is injected with 16 tons of blocking remover in 26 days after 6 months, the well is shut in for 48 hours, the daily oil yield after opening the well is increased from 30t/d before blocking removal to 50t/d, the effective period is more than 3 months, and the effects before and after blocking removal are opposite as shown in figure 2. The solution directly enters a ground manifold system after the on-site blocking removal in the figures 1 and 2, and the detection results of a central processing station show that the blocking remover solution has little influence on the performance of the manifold system and the oil product.
In conclusion, compared with the existing oil well blocking remover, the oil well blocking remover has the advantages that the open flash point reaches more than 50 ℃, the safety is good, the preparation process is simple, the blocking removing efficiency on asphaltene and colloid sediments is high, the solution after blocking removing can directly enter a ground manifold system without being discharged, the safety and the environmental protection are realized, and the oil well blocking remover is suitable for blocking removing of oil wells and blocking objects in the near-well area in the oil well exploitation process.
Claims (11)
1. The oil well blocking remover is characterized by comprising the following raw material components by taking the total weight of the blocking remover as 100 percent:
the aromatic hydrocarbon solvent comprises aromatic hydrocarbon solvent oil S-100 and/or xylene;
the kerosene comprises jet fuel;
the oil-soluble penetrant comprises oleic acid diethanolamide and/or linoleic acid diethanolamide;
the nonionic surfactant includes a sorbitan fatty acid ester.
2. An oil well unblocking agent according to claim 1, characterized in that: the aromatic solvent is a composition of aromatic solvent oil S-100 and xylene.
3. An oil well unblocking agent according to claim 2, characterized in that: the mass ratio of the aromatic hydrocarbon solvent oil S-100 to the dimethylbenzene is 2: 1.
4. An oil well unblocking agent according to claim 1, characterized in that: the oil-soluble penetrant is a composition of oleic acid diethanolamide and linoleic acid diethanolamide.
5. An oil well unblocking agent according to claim 4, characterized in that: the mass ratio of the oleic acid diethanolamide to the linoleic acid diethanolamide is 3:1-1: 3.
6. An oil well unblocking agent according to claim 1, characterized in that: the nonionic surfactant is a combination of sorbitan monostearate Span60 and sorbitan fatty acid ester Span 80.
7. An oil well unblocking agent according to claim 6, characterized in that: the mass ratio of the sorbitan monostearate Span60 to the sorbitan fatty acid ester Span80 is 2:1-1: 2.
8. A method for preparing an oil well blocking remover as claimed in any one of claims 1 to 7, comprising the steps of:
the oil well blocking remover is obtained by mixing and stirring an aromatic hydrocarbon solvent, kerosene, an oil-soluble penetrating agent and a nonionic surfactant at a constant temperature.
9. The method of claim 8, wherein: the stirring temperature at constant temperature is 30-40 ℃.
10. The method of claim 8, wherein: the stirring time at constant temperature is 1-2 h.
11. Use of the oil well plug of any one of claims 1 to 7 for plugging of oil well plugs during production from an oil well.
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| CN103897680A (en) * | 2014-04-14 | 2014-07-02 | 中国石油大学(北京) | Oil-soluble asphaltene dispersing blockage remover |
| CN103965850A (en) * | 2014-05-13 | 2014-08-06 | 新疆福利精细化工厂 | Viscosity reducer for crude oil and preparation method thereof |
| CN106566506A (en) * | 2016-11-02 | 2017-04-19 | 成都劳恩普斯科技有限公司 | Nanopore throat cleaning agent, and preparation method and application thereof |
| CN107828396A (en) * | 2017-10-24 | 2018-03-23 | 中国石油天然气股份有限公司 | High flash point environment-friendly paraffin remover |
| CN107987818A (en) * | 2017-11-23 | 2018-05-04 | 克拉玛依新科澳石油天然气技术股份有限公司 | Oil-base paraffin remover and preparation method thereof |
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