Low-temperature paraffin remover for paraffin with high carbon number and preparation method of low-temperature paraffin remover

Abstract

The invention discloses a low-temperature paraffin remover for paraffin with high carbon number, which belongs to the field of paraffin removers and comprises the following components in parts by weight: 70-80 parts of a first solvent and a second solvent; 3-13 parts of a penetrating agent and 1-10 parts of a dispersing agent; 1-7 parts of an inhibitor; the first solvent is one of S1000, S1200, S1500, S1800, S2000, S2600, D40, D60, D80 and 1-ethyl-3-methylimidazolium tetrafluoroborate, and the second solvent is one of 1-ethyl-3-methylimidazolium tetrafluoroborate and 1-ethyl-3-methylimidazolium tetrafluoroborate; the second solvent is one or a mixture of more of petroleum ether 60 # to 90 #, petroleum ether 90 # to 120 #, petroleum ether 150 #, petroleum ether 200 #, n-heptane, dodecane, isododecane, nonane, 2-methyl-3-ethylpentane, 3-methylhexane, ethanol, acetone, dimethyl sulfoxide and tetrahydrofuran; and the penetrating agent is one of n-amyl alcohol, isoamyl alcohol, n-caprylic alcohol, hexanediol and ammonium adipate.

Description

Technical Field

[0001] The present invention relates to a paraffin remover for high-carbon paraffin at low temperature and a preparation method thereof, belonging to the field of oilfield chemicals. Background Art

[0002] During the process of oil exploitation, wax deposition in oil wells is a common and intractable problem. With the deepening of exploitation, the wax components in crude oil are prone to precipitate and deposit on the inner wall of the oil pipe under low-temperature conditions, forming the so-called "wax blockage" phenomenon. This not only seriously affects the normal production of oil wells, reduces the oil production, but also increases the maintenance cost and potential safety hazards of oil wells. Traditional wax removal methods, such as mechanical wax removal and thermal wax removal, although can solve the wax deposition problem to a certain extent, often have disadvantages such as complex operation, high cost, and damage to oil well equipment. Especially in low-temperature oil wells, due to the low ambient temperature, wax is more likely to precipitate, and traditional wax removal methods often have poor effects or even cannot be implemented. Among them, the deposition problem of high-carbon paraffin is particularly prominent, becoming a major obstacle restricting the efficient production of oil wells. High-carbon paraffin, due to its complex molecular structure and high melting point, often precipitates in the low-temperature areas of oil wells or during the transportation process, forming a hard wax deposition layer. These deposition layers not only seriously impede the smooth flow of oil, reducing the productivity of oil wells, but also may cause serious consequences such as equipment blockage and pipeline rupture, posing a threat to the safe operation of oil wells. Traditional wax removal methods often have limited effects when dealing with high-carbon paraffin, and may even exacerbate the problem due to improper operation.

[0003] Therefore, for the removal of high-carbon paraffin, there is an urgent need for an efficient, safe, and reliable solution. This requires the development of a wax remover specifically for removing high-carbon paraffin. This wax remover should have strong dissolution and dispersion capabilities, be able to effectively penetrate and break down the wax deposition layer, and at the same time maintain friendliness to oil well equipment and pipelines to avoid causing additional damage. Currently, the developed wax remover products have varying degrees of problems such as single performance, strong selectivity, difficulty in removing high-carbon paraffin, and low wax removal effect in low-temperature environments. Therefore, it is particularly important to develop an efficient, safe, and low-temperature oil well applicable wax remover for high-carbon paraffin. The low-temperature wax remover can effectively dissolve and disperse wax under low-temperature conditions through special chemical components and formula design, preventing it from depositing on the inner wall of the oil pipe, thus ensuring the normal production and operation of oil wells. Summary of the Invention

[0004] The purpose of the present invention is to disclose a paraffin remover for high-carbon paraffin at low temperature, which includes, by weight:

[0005] The first solvent and the second solvent, 70 - 80 parts.

[0006] The penetrant, 3 - 13 parts,

[0007] Dispersant, 1 - 10 parts;

[0008] Inhibitor, 1 - 7 parts.

[0009] In a preferred embodiment, the first solvent is one of S1000, S1200, S1500, S1800, S2000, S2600, D40, D60, D80, 1 - ethyl - 3 - methylimidazolium tetrafluoroborate.

[0010] In a preferred embodiment, the second solvent is one or a mixture of more than one of 60 - 90# petroleum ether, 90 - 120# petroleum ether, 150# petroleum ether, 200# petroleum ether, n - heptane, dodecane, isododecane, nonane, 2 - methyl - 3 - ethylpentane, 3 - methylhexane, ethanol, acetone, dimethyl sulfoxide, tetrahydrofuran.

[0011] In a preferred embodiment, the penetrant is one of n - pentanol, iso - pentanol, n - octanol, hexanediol, ammonium adipate.

[0012] In a preferred embodiment, the dispersant is at least one of OP - 4, OP - 7, OP - 10, S20, S40, S60, S80, S85.

[0013] In a preferred embodiment, the inhibitor is at least one of CW40 - 705, CW40 - 707, CW40 - 716, CW40 - 607H, CW40 - 907J, CW40 - 960.

[0014] In a preferred embodiment, the first solvent is 1 - ethyl - 3 - methylimidazolium tetrafluoroborate, the second solvent is a mixture of ethanol, acetone, and dimethyl sulfoxide, and the dispersant is one of OP - 4 and OP - 7.

[0015] In a preferred embodiment, the ratio of the first solvent to the second solvent is 85:(8 - 15): The proportions of ethanol, acetone, and dimethyl sulfoxide in the first solvent are 3% - 5%, 2 - 4%, and 6% - 10% respectively.

[0016] This application also discloses a preparation method of the high - carbon - number paraffin low - temperature paraffin remover. The first solvent and the second solvent are mixed in proportion, and other additives are added to the mixture.

[0017] The present invention solves the problems of difficult paraffin removal, high paraffin - removal temperature, and low paraffin - removal efficiency of existing high - carbon - number paraffins, achieving a good paraffin - removal effect with a small dosage and at a low temperature, and shortening the paraffin - removal cycle.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] The raw materials used in the present invention are readily available and have a wide range of sources; the paraffin remover of the present invention can react with paraffin at low temperatures and has excellent paraffin removal effects. The present invention can effectively remove unconventional high-carbon-number paraffin and has a good paraffin removal rate; the on-site construction process of the paraffin remover of the present invention is simple. Detailed implementation manners

[0020] The following provides a detailed description of the present invention.

[0021] Prepare a second solvent mixture, where the proportions of ethanol, acetone, and dimethyl sulfoxide are 30%, 30%, and 40% respectively, and use the prepared second solvent mixture for the following operations.

[0022] Example 1

[0023] Mix 60% S1000, 30% 60-90# petroleum ether, 3% n-pentanol, 3% OP-4, and 4% CW40-705 to obtain a low-temperature paraffin remover for high-carbon-number paraffin. After reacting the paraffin remover with high-carbon-number paraffin at 10°C for 2 h, measure its paraffin removal rate and the dispersion rate of high-carbon-number paraffin.

[0024] Example 2

[0025] Mix 60% S1200, 30% 90-120# petroleum ether, 5% iso-pentanol, 3% OP-7, and 2% CW40-707 to obtain a low-temperature paraffin remover for high-carbon-number paraffin. After reacting the paraffin remover with high-carbon-number paraffin at 10°C for 3 h, measure its paraffin removal rate and the dispersion rate of high-carbon-number paraffin.

[0026] Example 3

[0027] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% 60-90# petroleum ether, 3% n-pentanol, 3% OP-4, and 4% CW40-705 to obtain a low-temperature paraffin remover for high-carbon-number paraffin. After reacting the paraffin remover with high-carbon-number paraffin at 10°C for 2 h, measure its paraffin removal rate and the dispersion rate of high-carbon-number paraffin.

[0028] Example 4

[0029] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% 90-120# petroleum ether, 5% iso-pentanol, 3% OP-7, and 2% CW40-707 to obtain a low-temperature paraffin remover for high-carbon-number paraffin. After reacting the paraffin remover with high-carbon-number paraffin at 10°C for 3 h, measure its paraffin removal rate and the dispersion rate of high-carbon-number paraffin.

[0030] Example 5

[0031] Mix 60% S1000, 30% of the second solvent mixture, 3% n-pentanol, 3% OP-4, and 4% CW40-705 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting this paraffin wax remover with paraffin wax with high carbon number at 10°C for 2 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0032] Example 6

[0033] Mix 60% S1200, 30% of the second solvent mixture, 5% iso-pentanol, 3% OP-7, and 2% CW40-707 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting this paraffin wax remover with paraffin wax with high carbon number at 10°C for 3 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0034] Example 7

[0035] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% of the second solvent mixture, 3% n-pentanol, 3% OP-4, and 4% CW40-705 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting this paraffin wax remover with paraffin wax with high carbon number at 10°C for 2 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0036] Example 8

[0037] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% of the second solvent mixture, 5% iso-pentanol, 3% OP-7, and 2% CW40-707 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting this paraffin wax remover with paraffin wax with high carbon number at 10°C for 3 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0038] Example 9

[0039] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% ethanol, 3% n-pentanol, 3% OP-4, and 4% CW40-705 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting this paraffin wax remover with paraffin wax with high carbon number at 10°C for 2 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0040] Example 10

[0041] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% ethanol, 5% iso-pentanol, 3% OP-7, and 2% CW40-707 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting this paraffin wax remover with paraffin wax with high carbon number at 10°C for 3 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0042] Example 11

[0043] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% acetone, 3% n-pentanol, 3% OP-4, and 4% CW40-705 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting the paraffin wax remover with paraffin wax with high carbon number at 10°C for 2 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0044] Example 12

[0045] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% acetone, 5% iso-pentanol, 3% OP-7, and 2% CW40-707 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting the paraffin wax remover with paraffin wax with high carbon number at 10°C for 3 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0046] Example 13

[0047] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% dimethyl sulfoxide, 3% n-pentanol, 3% OP-4, and 4% CW40-705 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting the paraffin wax remover with paraffin wax with high carbon number at 10°C for 2 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0048] Example 14

[0049] Mix 60% 1-ethyl-3-methylimidazolium tetrafluoroborate, 30% dimethyl sulfoxide, 5% iso-pentanol, 3% OP-7, and 2% CW40-707 to obtain a paraffin wax remover for low temperature with high carbon number. After reacting the paraffin wax remover with paraffin wax with high carbon number at 10°C for 3 hours, measure its paraffin wax removal rate and the dispersion rate of paraffin wax with high carbon number.

[0050] Table 1 Paraffin wax removal rate of paraffin wax dispersive remover with high carbon number

[0051]

[0052] From the comparison of Examples 3 and 4 with Examples 1 and 2, it can be seen that 1-ethyl-3-methylimidazolium tetrafluoroborate only causes an increase in the removal rate, but the increase amplitude is not large; from Examples 5 and 6 compared with Examples 1 and 2, the second solvent mixture of the present application instead causes a slight decrease in the removal rate; from Examples 7 and 8, it can be seen that the mixed use of 1-ethyl-3-methylimidazolium tetrafluoroborate and the second solvent mixture leads to a significant increase in the effect. From Examples 9-14, it can be seen that the use of the second solvent mixture is equivalent to better effects of three components.

Claims

1. A paraffin remover for low-temperature with high carbon number paraffin, characterized in that, Comprising by weight parts: A first solvent and a second solvent, 70 - 80 parts. A penetrant, 3 - 13 parts, A dispersant, 1 - 10 parts; An inhibitor, 1 - 7 parts.

2. The paraffin remover for low-temperature cleaning of high-carbon paraffin according to claim 1, wherein The first solvent is one of S1000, S1200, S1500, S1800, S2000, S2600, D40, D60, D80, 1 - ethyl - 3 - methylimidazolium tetrafluoroborate, 1 - butyl - 3 - methylimidazolium hexafluorophosphate.

3. The paraffin dewaxing agent for high-carbon paraffin at low temperature according to claim 2, wherein The second solvent is one or a mixture of more than one of 60 - 90# petroleum ether, 90 - 120# petroleum ether, 150# petroleum ether, 200# petroleum ether, n - heptane, dodecane, isododecane, nonane, 2 - methyl - 3 - ethylpentane, 3 - methylhexane, ethanol, acetone, dimethyl sulfoxide, tetrahydrofuran.

4. The paraffin remover for low temperature of high-carbon number paraffin according to claim 1, characterized in that The penetrant is one of n - pentanol, iso - pentanol, n - octanol, hexanediol, ammonium adipate.

5. The low-temperature paraffin remover for high-carbon number paraffin according to claim 3, characterized in that, The dispersant is at least one of OP - 4, OP - 7, OP - 10, S20, S40, S60, S80, S85.

6. The paraffin remover for low-temperature high-carbon paraffin according to claim 5, characterized in that, The inhibitor is at least one of CW40 - 705, CW40 - 707, CW40 - 716, CW40 - 607H, CW40 - 907J, CW40 - 960.

7. The paraffin dewaxing agent for high-carbon paraffin at low temperature according to any one of claims 1-6, characterized in that, The first solvent is 1 - ethyl - 3 - methylimidazolium tetrafluoroborate, the second solvent is a mixture of ethanol, acetone, dimethyl sulfoxide, and the dispersant is one of OP - 4, OP - 7.

8. The paraffin remover for low-temperature cleaning of high-carbon paraffin according to claim 7, characterized in that, The ratio of the first solvent to the second solvent is 60:(25 - 30): The proportions of ethanol, acetone, and dimethyl sulfoxide in the first solvent are 3% - 5%, 2 - 4%, and 6% - 10% respectively.

9. A preparation method of the paraffin dewaxing agent with high carbon number described in any one of claims 1-8, characterized in that, Mix the first solvent and the second solvent in proportion, and add other additives to the mixture.

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