CN108980621B - Polymer drag reducer swelling treatment method for shortening drag reducer onset time - Google Patents

Abstract

The invention relates to a swelling treatment method for a polymer drag reducer, which is used for shortening the onset time of the drag reducer. The technical scheme comprises the following steps: firstly, shearing polymer solid, and placing the polymer solid in a reaction kettle; secondly, filling carbon dioxide into the reaction kettle to enable the reaction kettle to reach a supercritical state; thirdly, after the polymer is swelled, removing carbon dioxide in the kettle and taking out a sample; fourthly, weighing, putting into a freezing barrel, and treating at low temperature; fifthly, transferring the mixture into a crusher for coarse crushing and grinding; and sixthly, adding an isolating agent, and performing ball milling and mixing to obtain the slurry oil drag reducer product with quick response. The beneficial effects are that: according to the invention, the polymer is treated by the supercritical fluid before low-temperature crushing, so that the swelling effect is generated, then low-temperature crushing and grinding are carried out, and the requirements of full isolation and suspension processes are met.

Description

Swelling treatment method of polymer drag reducer for shortening the onset time of drag reducer

technical field

The invention relates to the technical field of drag reduction and transportation of oil pipelines, drag reducer production and post-treatment, in particular to a swelling treatment method for a polymer drag reducer for shortening the onset time of the drag reducer.

Background technique

Adding drag reducers to oil pipelines can increase pipeline throughput without adding additional transportation equipment, or reduce the operating pressure of oil pipelines without reducing transportation capacity. Process specification. The commercial oil drag reducer is a polyalphaolefin slurry product with a molecular weight of more than 6 million. It is dissolved in the oil after a certain period of time through the injection system, and transmits energy through the elastic deformation of the molecular chain, reducing the friction in the oil flow. Energy loss, the apparent phenomenon is to reduce the flow resistance and reduce the resistance, thereby realizing the reduction of the resistance and the increase of the output.

At present, the initial state of drag-reducing polyalphaolefin prepared by commercial bulk polymerization is viscoelastic solid, and it is directly used as drag reducing agent. Due to the viscoelasticity of polyalphaolefin particle itself, it is extremely easy to stick and form agglomerates, which is difficult to stably disperse, and it is difficult to stably disperse and reduce drag. The injection of the drag reducing agent brings difficulties, and in the oil product, because the polyalphaolefin particles stick to each other and form agglomeration, the dissolution rate of the drag reducing agent particles is directly reduced, the drag reduction efficiency is reduced, and even the pipeline is blocked. Therefore, polyalphaolefins must be post-treated to bring them into a fluid state for ease of application. Usually, the post-treatment of the drag reducing polymer is to suspend and disperse the polymer particles obtained by ultra-low temperature grinding in a water-based, alcohol-based or oil-based suspension. The suspended drag reducing agent can be dissolved in the oil more quickly. to the drag reduction effect. The oil-based suspension contains vegetable oil, bactericide, ultraviolet absorber and other components. After adding drag-reducing particles, an emulsified drag-reducing agent suspension is formed by high-speed stirring.

In practical applications, it takes more than 60 minutes to observe the drag reduction phenomenon (the entry pressure of the downstream station) after the slurry-like drag reducer suspension is injected into the oil pipeline. After the suspension of the drag reducing agent enters the oil in the pipeline, the various components added in the post-processing process are gradually peeled off from the surface of the pulverized polyalphaolefin particles, and the polyalphaolefin continues to swell and dissolve after contacting the petroleum components. Until it is completely dissolved and dispersed into the oil at the end, the duration of this process results in that it takes a certain amount of time to achieve the drag reduction effect after the drag reducer suspension is added. In view of the current dispersion time problem in the application of polyalphaolefin drag reducer suspension, supercritical CO2 _, methanol or toluene is added on the basis of the original post-treatment suspension system preparation process, and the process parameters are adjusted to pass supercritical CO2 _, The swelling effect of methanol or toluene on polyalphaolefin is used to shorten the dispersion and dissolution time of the drag reducer suspension in the oil, and to achieve the purpose of rapid onset.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a method for swelling treatment of a drag reducer for shortening the onset time of the drag reducer in view of the above-mentioned defects in the prior art.

A kind of polymer drag reducing agent swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention, its technical scheme comprises the following preparation steps:

In the first step, the dry block-shaped drag-reducing polymer solid is cut into small pieces of 5cm square, and after weighing and marking, it is placed in a pressure-resistant thermal insulation reaction kettle and sealed;

In the second step, the reaction kettle was filled with carbon dioxide, and the reaction temperature was controlled within 30 min at the set temperature of -10-30°C. After the temperature was stabilized, carbon dioxide was filled again to the experimental set pressure, which was greater than the carbon dioxide Set the critical pressure at the temperature to make the carbon dioxide fluid in the kettle reach the supercritical state, and keep it for 4~12h;

The third step, after the bulk drag-reducing polymer swells, remove the carbon dioxide in the kettle and take out the sample, weigh the sample within 2 minutes, and record, and compare the weight change before and after swelling;

In the fourth step, the bulk drag-reducing polymer swollen by the supercritical fluid is weighed and placed in a freezing bucket, and then filled with liquid nitrogen until the bulk drag-reducing polymer is submerged, and kept for 10-30 min. After the liquid nitrogen is evaporated, liquid carbon dioxide is added according to the mass ratio of 1:10-3:10 to the bulk drag-reducing polymer for 5~20min;

The fifth step, the block drag-reducing polymer treated at low temperature is immediately transferred to a crusher for coarse crushing, and then transferred to a ball mill, and grinding aids are added in a mass ratio of 1:10-1:20 to the polymer at a level below - Grinding at 40°C;

The sixth step, adding 20% of the polymer mass of the release agent to the ball mill while grinding, after a period of ball milling and mixing, and sieving to obtain the swollen surface-adhering resistance-reducing polymer of the release agent The fine powder dry agent can be directly dispersed in the suspension system to obtain a fast-acting slurry oil drag reducer product.

The second kind of polymer drag reducing agent swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention comprises the following preparation steps:

In the first step, the dry block-shaped drag-reducing polymer solid is cut into small pieces of 5cm square, and after weighing and marking, it is placed in a pressure-resistant thermal insulation reaction kettle and sealed;

In the second step, the reaction kettle was filled with methanol, and the reaction temperature was controlled within 30 min at the set temperature of -10-30 °C. After the temperature was stabilized, methanol was filled again to the experimental set pressure, which was greater than the methanol at Set the critical pressure at the temperature to make the methanol fluid in the kettle reach the supercritical state, and keep it for 4~12h;

The third step, after the bulk drag-reducing polymer swells, remove the methanol in the kettle and take out the sample, weigh the sample within 2 minutes, and record, and compare the weight change before and after swelling;

In the fourth step, the bulk drag-reducing polymer swollen by the supercritical fluid is weighed and placed in a freezing bucket, and then filled with liquid nitrogen until the bulk drag-reducing polymer is submerged, and kept for 10-30 min. After the liquid nitrogen evaporates, add liquid methanol according to the mass ratio of 1:10-3:10 to the bulk drag-reducing polymer for 5~20min;

The fifth step, the block drag-reducing polymer treated at low temperature is immediately transferred to a crusher for coarse crushing, and then transferred to a ball mill, and grinding aids are added in a mass ratio of 1:10-1:20 to the polymer at a level below - Grinding at 40°C;

The sixth step, adding 20% of the polymer mass of the release agent to the ball mill while grinding, after a period of ball milling and mixing, and sieving to obtain the swollen surface-adhering resistance-reducing polymer of the release agent The fine powder dry agent can be directly dispersed in the suspension system to obtain a fast-acting slurry oil drag reducer product.

The third kind of polymer drag reducing agent swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention comprises the following preparation steps:

In the first step, the dry block-shaped drag-reducing polymer solid is cut into small pieces of 5cm square, and after weighing and marking, it is placed in a pressure-resistant thermal insulation reaction kettle and sealed;

In the second step, the reaction kettle was filled with toluene, and the reaction temperature was controlled within 30 min at the set temperature of -10-30°C. After the temperature was stabilized, toluene was filled again to the experimental set pressure, which was greater than the toluene at Set the critical pressure at the temperature to make the toluene fluid in the kettle reach the supercritical state, and keep it for 4~12h;

In the third step, after the bulk drag-reducing polymer swells, remove the toluene in the kettle and take out the sample, weigh the sample within 2 minutes, record it, and compare the weight change before and after swelling;

In the fourth step, the bulk drag-reducing polymer swollen by the supercritical fluid is weighed and placed in a freezing bucket, and then filled with liquid nitrogen until the bulk drag-reducing polymer is submerged, and kept for 10-30 min. After the liquid nitrogen evaporates, add liquid toluene according to the mass ratio of 1:10-3:10 to the bulk drag-reducing polymer for 5~20min;

The fifth step, the block drag-reducing polymer treated at low temperature is immediately transferred to a crusher for coarse crushing, and then transferred to a ball mill, and grinding aids are added in a mass ratio of 1:10-1:20 to the polymer at a level below - Grinding at 40°C;

The sixth step, adding 20% of the polymer mass of the release agent to the ball mill while grinding, after a period of ball milling and mixing, and sieving to obtain the swollen surface-adhering resistance-reducing polymer of the release agent The fine powder dry agent can be directly dispersed in the suspension system to obtain a fast-acting slurry oil drag reducer product.

Preferably, the above-mentioned grinding aid is one of starch, stearic anhydride or calcium stearate.

Preferably, the above-mentioned release agent is one of calcium stearate, aluminum stearate, talc or acicular paraffin.

The beneficial effects of the present invention are as follows: in the present invention, the bulk drag-reducing polymer is processed by supercritical fluid before low-temperature pulverization, so that the polymer has a certain swelling effect, and then the low-temperature pulverization and grinding are carried out. The agent can make the powdery polymer meet the requirements of sufficient isolation and suspension process. This treatment method can shorten the swelling, dissolution and dispersion time of the drag reducer in the oil, so that it can show the effect of drag reduction and transmission more quickly. .

Description of drawings

Accompanying drawing 1 is the structural representation of the rotating disk test system of the present invention;

In the above picture: constant temperature water bath 1, coupling 2, torque sensor 3, speed regulating motor 4, data acquisition card 5, computer 6, sample tank 7, lower support plate 8, support rod 9, upper support plate 10.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

Embodiment 1: a kind of polymer drag reducing agent particle swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention, its preparation method is as follows:

First, cut the dry bulk drag-reducing polymer solid into 5 cm square pieces, weigh 1 kg, and place them in a pressure-resistant thermal insulation reaction kettle to seal; then fill the reaction kettle with CO ₂ to reach 6.0 MPa, The temperature was controlled at 10 °C for another 30 min, and then the CO ₂ was recharged to the set pressure of 7.5 MPa (the critical pressure of CO ₂ at 10 ° C was 7.2 MPa). At this time, the CO ₂ in the kettle was supercritical and kept for 12 h; After the polymer swells, remove the _CO2 in the kettle and take out the sample, and weigh the marked sample within 2 minutes to be 1.123 kg; put the swollen drag-reducing polymer into a freezing barrel, and then fill it with liquid nitrogen to 1.123 kg. Submerge the polymer and keep it for 30min. After the liquid nitrogen evaporates, add liquid CO ₂ according to the mass ratio of the polymer to 3:10 and keep it for 20min; Add starch grinding aid at a ratio of 1:10 and keep it below -40°C throughout the process; at the same time of grinding, add 20% of the polymer mass of calcium stearate separator to the ball mill, and after sieving, the swollen treated Drag reducing polymer fine powder dry agent for surface adhesion release agent.

Embodiment 2: a kind of polymer drag reducing agent particle swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention, its preparation method is as follows:

First, cut the dry bulk drag-reducing polymer solid into 5 cm square pieces, weigh 1 kg, and place them in a pressure-resistant thermal insulation reaction kettle to seal; then fill the reaction kettle with CO ₂ to reach 2.0 MPa, The temperature was controlled at -10 °C for another 30 min, and then CO ₂ was recharged to the set pressure of 4.0 MPa (the critical pressure of CO ₂ at 10 ° C was 4.5 MPa). At this time, the CO ₂ in the kettle was supercritical and kept for 4 h. ; After the polymer is swollen, remove the _CO2 in the kettle and take out the sample, and weigh the marked sample within 2 minutes to be 1.086kg; put the swollen drag-reducing polymer into the freezing barrel, and then fill it with liquid nitrogen To submerge the polymer, keep it for 10 min. After the liquid nitrogen evaporates, add liquid CO ₂ according to the mass ratio of the polymer to 1:10 and keep it for 5 min; Add starch grinding aids in a mass ratio of 1:20, and keep it below -40°C throughout the process; at the same time, add 20% of the polymer mass of calcium stearate separator to the ball mill, and sieve to obtain swollen Dry powder of drag reducing polymer fine powder for treated surface adhesion release agent.

Embodiment 3: a kind of polymer drag reducing agent particle swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention, its preparation method is as follows:

First, cut the dry block-shaped drag-reducing polymer solid into 5cm square pieces, weigh 1 kg, and place them in a pressure-resistant thermal insulation reaction kettle to seal; then fill the reaction kettle with methanol to reach 0.1MPa, and then The temperature was controlled at 0 °C for 30 min, and then the methanol was refilled to the set pressure of 0.1 MPa (the critical pressure of methanol at 10 °C was 0.003 MPa). At this time, the methanol in the kettle was supercritical and kept for 4 h; After swelling, remove the methanol in the kettle (pay attention to the recovery of methanol) and take out the sample. The weight of the marked sample is weighed to 1.026kg within 2 minutes; Submerge the polymer and keep it for 10 min. After the liquid nitrogen evaporates, add methanol according to the mass ratio of the polymer at 1:10 and keep it for 5 min; then immediately transfer it to the crusher for coarse crushing, and then move it to the ball mill. Add stearic anhydride grinding aid at 1:10, and keep it below -40°C throughout the whole process; at the same time, add 20% of the polymer mass of aluminum stearate separator to the ball mill, and sieve to obtain a swollen treated The surface adhesion release agent of the drag reducing polymer fine powder dry agent.

Embodiment 4: a kind of polymer drag reducing agent particle swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention, its preparation method is as follows:

First, cut the dry block-shaped drag-reducing polymer solid into 5cm square pieces, weigh 1 kg, and place them in a pressure-resistant thermal insulation reaction kettle to seal; then fill the reaction kettle with methanol to reach 0.1MPa, and then The temperature was controlled at 30 °C within 30 min, and then the methanol was recharged to the set pressure of 0.2 MPa (the critical pressure of methanol at 10 °C was 0.02 MPa). At this time, the methanol in the kettle was supercritical and kept for 12 h; After swelling, remove the methanol in the kettle (pay attention to the recovery of methanol) and take out the sample, and weigh the marked sample within 2 minutes to be 1.053kg; put the swollen drag-reducing polymer into a freezing barrel, and then fill it with liquid nitrogen to 1.053kg. Submerge the polymer and keep it for 30 min. After the liquid nitrogen evaporates, add methanol according to the mass ratio of 3:10 to the polymer and keep it for 20 min; then immediately transfer it to the crusher for coarse crushing, and then move it to the ball mill. Add stearic anhydride grinding aid at 1:20, and keep it below -40°C throughout the whole process; at the same time, add 20% of the polymer mass of aluminum stearate separator to the ball mill, and sieve to obtain a swollen treated The surface adhesion release agent of the drag reducing polymer fine powder dry agent.

Embodiment 5: a kind of polymer drag reducing agent particle swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention, its preparation method is as follows:

First, cut the dry block drag-reducing polymer solid into 5 cm square pieces, weigh 1 kg, and place it in a pressure-resistant thermal insulation reaction kettle to seal; then fill the reaction kettle with toluene to reach 0.1 MPa, and then The reaction temperature was controlled at 0 °C within 30 min, and then toluene was recharged to the set pressure of 0.1 MPa (the critical pressure of toluene at 10 °C was 0.001 MPa). At this time, the toluene in the kettle was supercritical and kept for 4 h; After swelling, remove the toluene in the kettle (pay attention to the recovery of toluene) and take out the sample, weigh the marked sample within 2 minutes to 1.167kg; put the swollen drag-reducing polymer into the freezing barrel, and then fill it with liquid nitrogen To submerge the polymer, keep it for 10 minutes, after the liquid nitrogen evaporates, add toluene according to the mass ratio of the polymer at 1:10 and keep it for 5 minutes; Add calcium stearate grinding aid at a ratio of 1:20, and keep it below -40°C throughout the process; at the same time of grinding, add 20% talcum powder release agent of the polymer mass to the ball mill, and after sieving, the swollen treated The surface adhesion release agent of the drag reducing polymer fine powder dry agent.

Embodiment 6: a kind of polymer drag reducing agent particle swelling treatment method for shortening the onset time of drag reducing agent mentioned in the present invention, its preparation method is as follows:

First, cut the dry block drag-reducing polymer solid into 5 cm square pieces, weigh 1 kg, and place it in a pressure-resistant thermal insulation reaction kettle to seal; then fill the reaction kettle with toluene to reach 0.1 MPa, and then The reaction temperature was controlled at 30 °C within 30 min, and then toluene was recharged to the set pressure of 0.1 MPa (the critical pressure of toluene at 10 °C was 0.005 MPa). At this time, the toluene in the kettle was supercritical and kept for 12 h; After swelling, remove the toluene in the kettle (pay attention to the recovery of toluene) and take out the sample, weigh the marked sample weight within 2 minutes to 1.206kg; put the swollen drag-reducing polymer into the freezing barrel, and then fill it with liquid nitrogen To submerge the polymer, keep it for 10 min. After the liquid nitrogen evaporates, add toluene according to the mass ratio of the polymer to 3:10 and keep it for 5 min; Add calcium stearate grinding aid at a ratio of 1:10, and keep it below -40°C throughout the process; at the same time, add 20% of the polymer mass of acicular paraffin separator to the ball mill, and sieve to obtain a swollen Dry powder of drag reducing polymer fine powder for treated surface adhesion release agent.

Suspension method of drag reducer dry agent after swelling

The drag-reducing polymer fine powder dry agent needs to be dispersed into the suspension first, and then the relevant performance test can be carried out.

Weigh the polyalphaolefin fine powder after the existing swelling treatment, add it to the suspension according to the mass ratio of 35% of the suspension (the suspension system can be divided into oil-based, water-based and alcohol-based according to needs), and stir at 500 r/min. For 60 min, a stable slurry-like swell-reducing treated polyalphaolefin particle oil drag reducing agent suspension solution was formed.

Effect test (experimental test drag reducer concentration 25ppm)

(1) Test standards and methods

The standard "Indoor Test Method for Drag Reduction Effect of Oil Pipeline Drag Reducing Agents SY/T6578-2009" requires "to prepare a solution with a polymer concentration of 1 g/L with diesel oil or other non-polar solvents". The resist is uniformly dispersed in the solvent, and then configured to the test experimental concentration, and dispersed by nitrogen bubbling for a period of time. In this evaluation method, the drag reducing agent has been fully dispersed and mixed in the test loop to characterize the drag reducing effect of the drag reducing agent in the present invention. In the actual test process, the difference in the onset time of the drag reducer was determined by changing the nitrogen bubbling dispersion time and evaluating the steady-state drag reduction effect.

(2) There is a dispersion onset time and dispersion distance when the drag reducing agent is added on site, so this experiment adopts a rotating disc system (refer to Figure 1) according to the actual working conditions. The rotating disc test system includes a constant temperature water bath 1, a connecting Shaft 2, torque sensor 3, speed regulating motor 4, data acquisition card 5, computer 6, sample tank 7, lower support plate 8, support rod 9, upper support plate 10, wherein one side of the lower support plate 8 Connect the upper support plate 10 through the support rod 9, install the constant temperature water bath 1 on the lower support plate 8, install the sample tank 7 on the constant temperature water bath 1; install the speed regulating motor 4 on the upper supporting plate 10, and the lower part of the speed regulating motor 4 The coupling 2 and the torque sensor 3 are connected, and the torque sensor 3 is connected to the data acquisition card 5 through a data cable, and further connected to the computer 6 .

When using, first examine the difference in onset time. The speed of the disc can be adjusted, the Reynolds number of the fluid can be changed, the fluid resistance can be calculated through the data collected by the torque sensor, and the drag reduction rate can be calculated based on the change of the flow resistance before and after adding the agent. difference in onset time.

After the loop test and the rotating disc test, comparing the onset time of the drag reducing performance of the drag reducer on the market and each example, it can be seen that: in the loop test, the commercially available drag reducer was bubbled and dispersed for 30min and 10min. There is a great difference in the post drag reduction performance, indicating that the drag reducer needs to swell and disperse for a long time to show the drag reduction effect. There is little difference in drag reduction performance between 30min and 10min dispersion of the six example samples, which can prove that the swelling treatment method of the invention can effectively reduce the onset time of drag reducer. In the rotating disc test, the drag reduction onset time of the samples of the 6 examples is more than 15min, while the commercial product is 30min, which further shows that the present invention can greatly reduce the drag reducer onset time.

In this case, due to the addition of A fluid (CO _{2 ,} methanol or toluene), under supercritical conditions, through its special dissolution and diffusion properties, it can penetrate into the solid of the drag-reducing polymer to achieve swelling and improve the quality of the drag-reducing polymer. With the increase of the surface area, the swelling, dissolution and dispersion process in the oil are accelerated, which promotes the rapid onset of the drag reducing agent.

The above are only some preferred embodiments of the present invention, and any person skilled in the art may use the technical solutions described above to modify or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent replacements made according to the technical solutions of the present invention fall within the protection scope of the present invention.

Claims (2)

1. A swelling treatment method of a polymer drag reducer for shortening the onset time of the drag reducer is characterized by comprising the following preparation steps:

firstly, cutting dry blocky anti-drag polymer solid into small blocks of 5cm square, weighing 1 kg, and placing the small blocks in a pressure-resistant heat-preservation reaction kettle for sealing; then filling methanol into the reaction kettle to reach 0.1MPa, controlling the temperature to be 0 ℃ within 30min, then filling the methanol again to the set pressure of 0.1MPa, wherein the methanol in the reaction kettle is supercritical and is kept for 4 hours; after the polymer is swelled, removing the methanol in the kettle and taking out the sample, and weighing the marked sample within 2min to obtain 1.026 kg; putting the swelled drag reduction polymer into a freezing barrel, then filling liquid nitrogen until the polymer is submerged, keeping for 10min, and after the liquid nitrogen is evaporated, adding methanol according to the mass ratio of 1:10 to the polymer and keeping for 5 min; then immediately transferring the mixture into a crusher for coarse crushing, transferring the mixture to a ball mill, adding a stearic anhydride grinding aid according to the mass ratio of the stearic anhydride grinding aid to the polymer of 1:10, and keeping the whole process at the temperature below 40 ℃ below zero; and (3) adding an aluminum stearate release agent accounting for 20% of the mass of the polymer into the ball mill during grinding, and screening to obtain the fine powder drying agent of the drag-reducing polymer with the surface adhered with the release agent after swelling treatment.

2. A swelling treatment method of a polymer drag reducer for shortening the onset time of the drag reducer is characterized by comprising the following preparation steps:

firstly, cutting dry blocky anti-drag polymer solid into small blocks of 5cm square, weighing 1 kg, and placing the small blocks in a pressure-resistant heat-preservation reaction kettle for sealing; then filling toluene into the reaction kettle to reach 0.1MPa, controlling the reaction temperature to be 0 ℃ within 30min, then filling toluene again to the set pressure of 0.1MPa, wherein the toluene in the kettle is supercritical and is kept for 4 h; after the polymer is swelled, removing the toluene in the kettle and taking out the sample, and weighing the marked sample within 2min to obtain 1.167 kg; placing the swelled drag reduction polymer into a freezing barrel, then filling liquid nitrogen until the polymer is submerged, keeping for 10min, and after the liquid nitrogen is evaporated, adding toluene according to the mass ratio of 1:10 to the polymer and keeping for 5 min; then immediately transferring the mixture into a crusher for coarse crushing, transferring the mixture to a ball mill, adding a calcium stearate grinding aid according to the mass ratio of 1:20 of the mixture to the polymer, and keeping the whole process at the temperature below 40 ℃ below zero; and (3) adding a talcum powder separant accounting for 20% of the mass of the polymer into the ball mill during grinding, and screening to obtain the anti-drag polymer fine powder dry agent with the separant adhered to the surface after swelling treatment.

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