CN114315620B - Hyperbranched polymer oil-containing drill cuttings cleaning agent and preparation method thereof - Google Patents
Hyperbranched polymer oil-containing drill cuttings cleaning agent and preparation method thereof Download PDFInfo
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Abstract
The invention provides a hyperbranched polymer oil-containing drill cuttings cleaning agent and a preparation method thereof, comprising the following steps: s1, preparing a reaction substrate A, S2, preparing a modified substrate B, S3, and preparing a hyperbranched polymer oil-containing drill cuttings cleaning agent; compared with the conventional oil-containing drilling cuttings cleaning agent with a linear structure, the hyperbranched oil-containing drilling cuttings cleaning agent provided by the invention has the characteristics of high branching three-dimensional spherical three-dimensional structure, less intermolecular winding, small interaction between molecules, and good solubility, and has higher surface activity, lower critical micelle concentration and better emulsifying property because the hyperbranched oil-containing drilling cuttings cleaning agent contains a plurality of hydrophilic and lipophilic groups, so that the hyperbranched oil-containing drilling cuttings cleaning agent has stronger surface activity and good cleaning effect.
Description
Technical Field
The invention relates to the technical field of environment-friendly treatment agents, in particular to a hyperbranched polymer oil-containing drill cuttings cleaning agent and a preparation method thereof.
Background
The shale gas in China has large recoverable reserve, is in the leading position in the world, and is one of important guarantees for the national economic development. The shale gas layer in China is relatively deep, and the oil-based drilling fluid has the advantages of strong well stabilizing capability, good shale hydration expansion inhibiting effect, small influence of a reservoir layer and the like, so that the oil-based drilling fluid is widely used in the shale gas exploration and development process, but the drilling fluid carries rock fragments to return to the ground, so that a large amount of oil-containing drilling cuttings are generated. Because the oil-containing drill cuttings have toxicity, environmental risks exist in all links of generation, stacking, transportation and treatment, and if the oil-containing drill cuttings are improperly treated, the surrounding ecological environment and the human health are adversely affected.
The oil sludge reduction treatment process at the present stage has various methods, such as an incineration method, a biological treatment method, a solvent extraction method, a thermal desorption method, a thermochemical cleaning method and the like. The thermochemical cleaning method mostly adopts hot alkaline aqueous solution or hot water solution containing surfactant and auxiliary agent with certain concentration to wash the oil sludge, and three-phase separation of water, oil and sludge is realized by means of standing, air floatation, rotational flow and the like after washing, so that the thermochemical cleaning method has the characteristics of economy, effectiveness, quick and simple operation and low requirement on equipment.
The thermochemical cleaning process flow comprises the steps of oil sludge treatment, mixing, dosing, primary cleaning, secondary cleaning, separation, cleaning water treatment and the like. The process affects the final cleaning effect, and is the screening of cleaning agent and the selection of primary and secondary cleaning conditions in the dosing process. The screening of the cleaning agent is an important component for treating the oil-containing drill cuttings by a thermochemical cleaning method, the conventional oil-containing drill cuttings cleaning agent is mostly of a linear structure, more intermolecular entanglement is achieved, and the interaction between molecules is large.
Disclosure of Invention
The invention provides a hyperbranched polymer oil-containing drill cuttings cleaning agent and a preparation method thereof, which can effectively solve the problems.
The embodiment of the invention is realized by the following technical scheme:
the invention provides a preparation method of a hyperbranched polymer oil-containing drill cuttings cleaning agent, which comprises the following steps:
s1, preparing a reaction substrate A
Respectively adding diethanolamine and methanol into a three-neck flask connected with a nitrogen protection and condensation pipe, magnetically stirring, dropwise adding methyl methacrylate into the three-neck flask by using a constant pressure funnel after the diethanolamine is completely dissolved, simultaneously introducing nitrogen, heating to 30-35 ℃ after the dropwise adding is finished for reaction, carrying out reduced pressure distillation on a reaction product by using a vacuum rotary evaporator for 4-6 hours, and cooling and discharging to obtain a reaction substrate A in a pale yellow oily liquid state;
s2, preparing a modified substrate B
Respectively adding saturated fatty acid and a catalyst into a three-neck flask connected with a nitrogen protection device and a condenser tube, heating to 100 ℃, magnetically stirring until the saturated fatty acid is completely dissolved under the protection of nitrogen, adding the reaction substrate A obtained in the step S1 into the dissolved saturated fatty acid, heating to 100-140 ℃ for reaction, and carrying out reduced pressure distillation on the reaction product by a vacuum rotary evaporator for 1-3h to obtain a thermosetting modified substrate B in a yellow oily liquid state;
s3, preparing hyperbranched polymer oil-containing drilling cuttings cleaning agent
Adding pentaerythritol and a catalyst into a three-neck flask connected with a nitrogen protection device and a condensing tube, magnetically stirring under the protection of nitrogen, heating to 100-140 ℃, and adding the ratio of the mole ratio of the pentaerythritol to the mole ratio of the modified substrate B (3-6) into the three-neck flask for reaction for 2.5-3h; and vacuumizing after the reaction to avoid bubble generation, obtaining a hyperbranched polymer crude product, extracting the crude product, and performing vacuum spin drying to obtain the hyperbranched polymer oil-containing drill cuttings cleaning agent.
The invention also provides a hyperbranched polymer oil-containing drill cuttings cleaning agent prepared by the method.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
compared with the conventional linear structure oil-containing drilling cuttings cleaning agent, the hyperbranched oil-containing drilling cuttings cleaning agent provided by the invention has a highly branched three-dimensional structure, less intermolecular winding, smaller intermolecular interaction and slower standing dissolution rate, can be dissolved in aqueous solution to form a solution by using an ultrasonic machine in an auxiliary way at 20 ℃, thus having certain water solubility, and has higher surface activity, lower critical micelle concentration and better emulsifying property because the cleaning agent contains a plurality of hydrophilic and lipophilic groups, so the hyperbranched structure oil-containing drilling cuttings cleaning agent has stronger surface activity and better cleaning effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a reaction path diagram of a preparation method of a hyperbranched polymer oil-containing drill cuttings cleaner provided in example 1 of the present invention;
FIG. 2 is a 3D display of the cleaning agent for oil-containing drill cuttings of the three-grafted hyperbranched polymer provided in example 1 of the present invention;
FIG. 3 is a 3D display of the cleaning agent for oil-containing drill cuttings of the four-grafted hyperbranched polymer provided in example 1 of the present invention;
FIG. 4 is an infrared signature of the cleaning agent for oil-containing drill cuttings of the three-grafted and four-grafted hyperbranched polymers provided in example 1 of the present invention;
FIGS. 5-6 are SEM scanning electron micrographs of oily cuttings prior to cleaning;
7-9 are SEM scanning electron microscope images of oil-containing drill cuttings washed by a cleaning agent for the oil-containing drill cuttings of the three-grafted hyperbranched polymer;
FIGS. 10-13 are SEM scanning electron microscope images of oil-containing drill cuttings washed with a four-grafted hyperbranched polymer oil-containing drill cuttings detergent;
FIG. 14 is a graph of experimental data of surface tension gamma and critical micelle concentration cmc of the cleaning agent for oil-containing drill cuttings of the three-grafted hyperbranched polymer provided in example 1 of the present invention;
fig. 15 is a graph of experimental data of surface tension γ and critical micelle concentration cmc of the cleaning agent for oil-containing drill cuttings of the four-grafted hyperbranched polymer provided in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The specific embodiment provides a preparation method of a hyperbranched polymer oil-containing drill cuttings cleaning agent, which comprises the following steps:
s1, preparing a reaction substrate A
And respectively adding diethanolamine and methanol into a three-neck flask connected with a nitrogen protection and condensation pipe, magnetically stirring, dropwise adding methyl methacrylate into the three-neck flask by using a constant pressure funnel after the diethanolamine is completely dissolved, simultaneously introducing nitrogen, heating to 30-35 ℃ after the dropwise addition is finished for reaction, carrying out reduced pressure distillation on a reaction product by using a vacuum rotary evaporator for 4-6 hours, and cooling and discharging to obtain a light yellow oily liquid reaction substrate A.
Preferably, the molar ratio of diethanolamine to methanol is 1:2.5, the reaction temperature is 35 ℃, the reaction time is 4 hours, the distillation temperature of reduced pressure distillation is 65 ℃, and the distillation time is 1 hour.
Wherein, the main function of the methanol is as a solvent, and the dosage of the methanol needs to meet the requirement of dissolving the diethanolamine.
Among them, reduced pressure distillation has an effect in that methanol can escape the product more rapidly in a reduced pressure environment using a boiling point of 64.8 ℃.
S2, preparing a modified substrate B
And (2) respectively adding saturated fatty acid and a catalyst into a three-neck flask connected with a nitrogen protection device and a condenser tube, heating to 100 ℃, magnetically stirring until the saturated fatty acid is completely dissolved under the protection of nitrogen, adding the reaction substrate A obtained in the step (S1) into the dissolved saturated fatty acid, heating to 100-140 ℃ for reaction, reacting for 1-3h, and carrying out reduced pressure distillation on the reaction product by a vacuum rotary evaporator to obtain a thermosetting modified substrate B in a yellow oily liquid state.
Preferably, the saturated fatty acid is a long-chain alkane saturated fatty acid, wherein the alkyl of the long-chain alkane is one or more of C12-18.
Preferably, the catalyst is one or more of p-toluenesulfonic acid, p-toluenesulfonyl chloride and biological enzyme, and most preferably p-toluenesulfonic acid.
Preferably, the molar ratio of the reaction substrate a, saturated fatty acid and catalyst is 1:1: (0.01-0.055).
Preferably, the reaction temperature is 130 ℃, the reaction time is 2.5 hours, the distillation temperature of the reduced pressure distillation is 70 ℃, and the distillation time is 1 hour.
S3, preparing hyperbranched polymer oil-containing drilling cuttings cleaning agent
Adding pentaerythritol and a catalyst into a three-neck flask connected with a nitrogen protection device and a condensing tube, magnetically stirring under the protection of nitrogen, heating to 100-140 ℃, and adding the ratio of the mole ratio of the pentaerythritol to the mole ratio of the modified substrate B (3-6) into the three-neck flask for reaction for 2.5-3h; and vacuumizing after the reaction to avoid bubble generation, obtaining a hyperbranched polymer crude product, extracting the crude product, and performing vacuum spin drying to obtain the hyperbranched polymer oil-containing drill cuttings cleaning agent.
Preferably, the molar ratio of pentaerythritol to the modified substrate B is 1:4, the reaction temperature is 140 ℃, the reaction time is 2.5 hours, the temperature of vacuum spin drying is 70 ℃, and the time of vacuum spin drying is 1 hour.
In order to sufficiently graft the modified substrate B to the four hydroxyl groups of pentaerythritol, the amount of the modified substrate B to be added is greater than that of pentaerythritol, considering the steric hindrance effect during the reaction.
Preferably, the catalyst is added in an amount of 0.5% -2% of the total mass of pentaerythritol and the modified substrate B.
Preferably, the crude product is extracted by pouring 50ml of anhydrous methanol into the crude product which has just reacted for dilution, cooling to room temperature, pouring into 200ml of diethyl ether, stirring for 30min, standing for delamination, separating into an upper layer and a lower layer, discarding the upper layer, reserving the lower layer, and repeating the above operation twice.
When standing and layering, the lower layer also comprises a light brown layer and a dark brown layer, the light brown layer and the dark brown layer are separated by gravity sedimentation, and vacuum spin drying treatment is respectively carried out on the light brown layer and the dark brown layer;
the light brown layer is a cleaning agent for the three-grafted hyperbranched polymer oil-containing drill cuttings, and the light brown layer is a cleaning agent for the four-grafted hyperbranched polymer oil-containing drill cuttings.
Example 1
The hyperbranched polymer oil-containing drilling cuttings cleaning agent is prepared by the embodiment and comprises the following steps of:
s1, respectively adding diethanolamine and methanol with a molar ratio of 1:2.5 into a three-neck flask connected with a nitrogen protection and condensation pipe, magnetically stirring, dropwise adding methyl methacrylate into the three-neck flask by using a constant pressure funnel after the diethanolamine is completely dissolved, simultaneously introducing nitrogen, heating to 35 ℃ after the dropwise addition is finished for reaction, carrying out reduced pressure distillation on a reaction product by using a vacuum rotary evaporator for 4 hours, wherein the distillation temperature of the reduced pressure distillation is 65 ℃, the distillation time is 1 hour, cooling and discharging to obtain a reaction substrate A in a pale yellow oily liquid state.
S2, preparing a modified substrate B
Respectively adding stearic acid and p-toluenesulfonic acid into a three-neck flask connected with a nitrogen protection device and a condenser pipe, heating to 100 ℃, magnetically stirring until the stearic acid is completely dissolved under the protection of nitrogen, adding the reaction substrate A obtained in the step S1 into the dissolved stearic acid, heating to 130 ℃ for reaction, carrying out reduced pressure distillation on the reaction product for 2.5h by a vacuum rotary evaporator, wherein the distillation temperature of the reduced pressure distillation is 70 ℃, and the distillation time is 1 h, so as to obtain a thermosetting modified substrate B in a yellow oily liquid state;
wherein, the mol ratio of the reaction substrate A to the stearic acid to the p-toluenesulfonic acid is 1:1:0.03.
s3, preparing hyperbranched polymer oil-containing drilling cuttings cleaning agent
Adding pentaerythritol and catalyst p-toluenesulfonic acid into a three-neck flask connected with a nitrogen protection device and a condensing tube, magnetically stirring under the protection of nitrogen, heating to 140 ℃, and adding the ratio of the mole ratio of the pentaerythritol to the mole ratio of the modified substrate B being 1:4 into the three-neck flask for reaction for 2.5h; vacuumizing after the reaction to avoid air bubbles, obtaining a hyperbranched polymer crude product, and performing vacuum spin drying (the temperature of the vacuum spin drying is 70 ℃ and the time of the vacuum spin drying is 1 hour) after the crude product is extracted;
wherein the adding amount of the catalyst p-toluenesulfonic acid is 1% of the total mass of pentaerythritol and the modified substrate B;
the extraction process of the crude product comprises the steps of pouring 50ml of anhydrous methanol into the crude product which is just reacted for dilution, cooling to room temperature, pouring into 200ml of diethyl ether, stirring for 30min, standing for layering, dividing into an upper layer and a lower layer, discarding the upper layer, reserving the lower layer, repeating the operation twice, separating the lower layer and the light brown layer by gravity sedimentation, and carrying out subsequent vacuum spin drying treatment on the two layers respectively;
finally, a cleaning agent A1 for the three-grafted hyperbranched polymer oil-containing drill cuttings and a cleaning agent B1 for the four-grafted hyperbranched polymer oil-containing drill cuttings are respectively obtained.
Example 2
The other features were the same as in example 1 except that lauric acid was used instead of stearic acid, and finally three-graft hyperbranched polymer oil-containing drill cuttings detergent A2 and four-graft hyperbranched polymer oil-containing drill cuttings detergent B2 were obtained, respectively.
Example 3
The other features were the same as in example 1 except that palmitic acid was used instead of stearic acid, and finally three-graft hyperbranched polymer oil-containing drill cuttings detergent A2 and four-graft hyperbranched polymer oil-containing drill cuttings detergent B3 were obtained, respectively.
Example 4
The remaining features are the same as in example 1 except that the molar ratio of reaction substrate a, stearic acid and p-toluenesulfonic acid is 1:1: and 0.01, respectively obtaining a three-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent A3 and a four-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent B4.
Example 5
The remaining features are the same as in example 1 except that the molar ratio of reaction substrate a, stearic acid and p-toluenesulfonic acid is 1:1: and 0.055, and finally respectively obtaining a cleaning agent A4 for the three-grafted hyperbranched polymer oil-containing drill cuttings and a cleaning agent B5 for the four-grafted hyperbranched polymer oil-containing drill cuttings.
Experimental example 1
As shown in fig. 4, infrared characterization was performed on the three-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent and the four-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent prepared in example 1, respectively.
From the infrared analysis, the two products were found to be at 3400cm -1 The absorption peaks of hydroxyl groups with wide peak shapes in association state exist, and four hydroxyl groups in pentaerythritol have certain free characteristics, so that the three-grafting hyperbranched product is 3600cm in length -1 The intensity of the peak is obvious, and the four-grafted hyperbranched product has more associated hydroxyl groups on the grafted chain, so the four-grafted hyperbranched product is 3400cm -1 The intensity of the peak is more obvious; 2950cm -1 And 2800cm -1 The telescopic vibration peaks of methyl and methylene are shown, which shows that long-chain hydrophobic groups are introduced in successful reaction, compared with three-and four-grafted products, the absorption peaks of methyl and methylene of the four-grafted hyperbranched product are obviously enhanced along with the introduction of more long-chain alkyl, and meanwhile, the four-grafted hyperbranched product with one more functional group branched chain is 1733cm -1 At 1178cm -1 The carbon-nitrogen bond vibration absorption peak is stronger. In addition, 1400-1500cm -1 Is the characteristic bending vibration peak of C-O expansion and contraction, 1035cm -1 The asymmetric stretching vibration absorption peak of the carbon-oxygen bond in the ester group is shown. In particular at 1305cm -1 There is a C-O bond peak connecting three R groups, which peak does not occur in the four-grafted hyperbranched product, since the fourth hydroxyl group of pentaerythritol in the three-grafted hyperbranched product is not substituted, and this functional group is only present in the three-grafted hyperbranched product.
Experimental example 2
As shown in fig. 5 to 13, the cleaning agent for the oil-containing drill cuttings of the three-grafted hyperbranched polymer and the cleaning agent for the oil-containing drill cuttings of the four-grafted hyperbranched polymer prepared in example 1 are used for cleaning the oil-containing drill cuttings, and SEM electron microscopy scanning is carried out on the oil-containing drill cuttings before and after cleaning.
According to an SEM scanning electron microscope image, the surface of the drill cuttings is found to have no pore canal and pore structure, and fine drill cuttings subjected to the adhesion of oil sludge are simultaneously found to be in existence in the SEM image of the unwashed oil-containing drill cuttings, and the cleaning agent is found to play a role in the SEM image of the cleaned oil-containing drill cuttings, so that the pore canal and pore structure are formed on the surface of the drill cuttings, and the fine drill cuttings subjected to the adhesion of the oil sludge are not in existence.
Experimental example 3
As shown in fig. 14, the three-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent prepared in example 1 is prepared into a series of solutions with a concentration, and the surface tension gamma and the critical micelle concentration cmc of the three-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent are measured by using an interface parameter integrated measurement system by adopting a hanging drop method.
As can be seen from the graph, at low concentration, the surface tension decreases slightly as the concentration of the surfactant solution increases, and as the concentration of the solution continues to increase, the surface tension decreases sharply, and finally, as the concentration of the solution increases to a certain value, the surface tension remains substantially unchanged. The cmc of the four-grafted surfactant was found to be 5.73X10 by experiment -3 mol/L，γ cmc The surfactant showed a strong surface activity of 38.75 mN/m.
Experimental example 4
As shown in fig. 15, the four-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent prepared in example 1 is prepared into a series of solutions with a concentration, and the surface tension gamma and the critical micelle concentration cmc of the four-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent are measured by an interface parameter integrated measurement system under the condition of 285K temperature by adopting a hanging drop method.
As can be seen from the graph, at low concentration, the surface tension decreases slightly as the concentration of the surfactant solution increases, and as the concentration of the solution continues to increase, the surface tension decreases sharply, and finally, as the concentration of the solution increases to a certain value, the surface tension remains substantially unchanged. The cmc of the four-grafted surfactant is 4.67 multiplied by 10 -3 mol/L，γ cmc 37.56mN/m, indicating that the surfactant has a higher surface activityStrong.
Experimental example 5
The experimental example adopts a measuring cylinder method, takes the water diversion time as an index to measure the emulsifying capacity of the cleaning agent for the three-grafted hyperbranched polymer oil-containing drill cuttings and the cleaning agent for the four-grafted hyperbranched polymer oil-containing drill cuttings, and also provides a traditional surfactant (sodium dodecyl benzene sulfonate and sodium dodecyl sulfate) as a comparison, and the specific measuring steps are as follows:
controlling the experiment temperature at 25 ℃ (here, preparing a proper amount of surfactant and pure water into a surfactant solution with the concentration of 0.1 percent, transferring 20mL of the solution into a 100mL measuring cylinder with a plug, transferring 20mL of diesel oil into the measuring cylinder, shaking up and down for 5 times after pinching the glass plug, standing for 1min, repeating the operation for 5 times, immediately timing after the last shaking, observing the emulsion, gradually separating the oil phase at the moment, taking the oil phase as an experiment end point when the water phase increases to 10mL, stopping timing, recording data, measuring 3 times, taking the average value, and the data are shown in table 1.
TABLE 1 determination of emulsifying Capacity of surfactant
| Name of the name | Time to split water |
| Three-graft hyperbranched surfactant | 14′45″ |
| Four-grafted hyperbranched surfactant | 15′12″ |
| Sodium dodecyl benzene sulfonate | 11′36″ |
| Sodium dodecyl sulfate | 9′40″ |
It can be seen from the table that under the condition of the same mass fraction concentration, different types of surfactants have certain difference on the emulsifying capacity of diesel oil, and compared with the traditional surfactants of sodium dodecyl benzene sulfonate and sodium dodecyl sulfate, the three-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent and the four-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent prepared in the embodiment 1 have longer water diversion time, which indicates that the three-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent has stronger emulsifying capacity.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The preparation method of the hyperbranched polymer oil-containing drill cuttings cleaning agent is characterized by comprising the following steps of:
s1, preparing a reaction substrate A
Respectively adding diethanolamine and methanol into a three-neck flask connected with a nitrogen protection and condensation pipe, magnetically stirring, dropwise adding methyl methacrylate into the three-neck flask by using a constant pressure funnel after the diethanolamine is completely dissolved, simultaneously introducing nitrogen, heating to 30-35 ℃ after the dropwise adding is finished for reaction, carrying out reduced pressure distillation on a reaction product by using a vacuum rotary evaporator for 4-6 hours, and cooling and discharging to obtain a reaction substrate A in a pale yellow oily liquid state;
s2, preparing a modified substrate B
Respectively adding saturated fatty acid and a catalyst into a three-neck flask connected with a nitrogen protection device and a condenser tube, heating to 100 ℃, magnetically stirring until the saturated fatty acid is completely dissolved under the protection of nitrogen, adding the reaction substrate A obtained in the step S1 into the dissolved saturated fatty acid, heating to 100-140 ℃ for reaction, and carrying out reduced pressure distillation on the reaction product by a vacuum rotary evaporator for 1-3h to obtain a thermosetting modified substrate B in a yellow oily liquid state;
s3, preparing hyperbranched polymer oil-containing drilling cuttings cleaning agent
Adding pentaerythritol and a catalyst into a three-neck flask connected with a nitrogen protection device and a condensing tube, magnetically stirring under the protection of nitrogen, heating to 100-140 ℃, and adding the ratio of the mole ratio of the pentaerythritol to the mole ratio of the modified substrate B (3-6) into the three-neck flask for reaction for 2.5-3h; vacuumizing after the reaction to avoid bubble generation, obtaining a hyperbranched polymer crude product, extracting the crude product, and performing vacuum spin drying to obtain a hyperbranched polymer oil-containing drill cuttings cleaning agent;
wherein the saturated fatty acid is stearic acid;
wherein the catalyst is p-toluenesulfonic acid;
the hyperbranched polymer oil-containing drill cuttings cleaning agent is respectively a three-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent and a four-grafted hyperbranched polymer oil-containing drill cuttings cleaning agent;
wherein the structural formula of the reaction substrate A is
Wherein the structural formula of the modified substrate B is
Wherein the structural formula of the cleaning agent for the three-grafted hyperbranched polymer oil-containing drill cuttings is as follows
Wherein the structural formula of the four-grafted hyperbranched polymer oil-containing drilling cuttings cleaning agent is as follows
2. The method of preparing a hyperbranched polymer oil-containing drill cuttings cleaner of claim 1, characterized in that in step S1:
the mol ratio of diethanolamine to methanol is 1:2.5, the reaction temperature is 35 ℃, the reaction time is 4 hours, the distillation temperature of reduced pressure distillation is 65 ℃, and the distillation time is 1 hour.
3. The method of preparing a hyperbranched polymer oil-containing drill cuttings cleaner of claim 1, characterized in that in step S2:
the molar ratio of the reaction substrate A to the saturated fatty acid to the catalyst is 1:1: (0.01-0.055).
4. The method of preparing a hyperbranched polymer oil-containing drill cuttings cleaner of claim 1, characterized in that in step S2:
the reaction temperature was 130℃and the reaction time was 2.5 hours, and the distillation temperature by distillation under reduced pressure was 70℃and the distillation time was 1 hour.
5. The method of preparing a hyperbranched polymer oil-containing drill cuttings cleaner of claim 1, characterized in that in step S3:
the molar ratio of pentaerythritol to the modified substrate B is 1:4, the reaction temperature is 140 ℃, the reaction time is 2.5 hours, the vacuum spin-drying temperature is 70 ℃, and the vacuum spin-drying time is 1 hour;
wherein the addition amount of the catalyst is 0.5% -2% of the total mass of the pentaerythritol and the modified substrate B.
6. The method of preparing a hyperbranched polymer oil-containing drill cuttings cleaner of claim 1, characterized in that in step S3:
the extraction process of the crude product comprises the steps of pouring 50ml of anhydrous methanol into the crude product which has just reacted for dilution, cooling to room temperature, pouring into 200ml of diethyl ether, stirring for 30min, standing for layering, separating into an upper layer and a lower layer, discarding the upper layer, reserving the lower layer, and repeating the operation twice.
7. The method for preparing the hyperbranched polymer oil-containing drill cuttings cleaning agent according to claim 6, wherein the lower layer further comprises a light brown layer and a dark brown layer when standing and layering, the light brown layer and the dark brown layer are separated by gravity sedimentation, and vacuum spin drying treatment is respectively carried out on the light brown layer and the dark brown layer;
the light brown layer is a cleaning agent for the three-grafted hyperbranched polymer oil-containing drill cuttings, and the light brown layer is a cleaning agent for the four-grafted hyperbranched polymer oil-containing drill cuttings.
8. A hyperbranched polymer oil-containing drill cuttings cleaning agent, characterized in that the cleaning agent is prepared by the preparation method of the hyperbranched polymer oil-containing drill cuttings cleaning agent of any one of claims 1-7.
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