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Polymer drag reducer swelling treatment method for shortening onset time of drag reducer

A technology of onset time and treatment method, applied in the production of bulk chemicals, pipeline systems, mechanical equipment, etc., can solve the problems of difficulty in injecting drag reducing agents, reducing drag reducing efficiency, and decreasing the dissolution rate of drag reducing agent particles. Quickly reduce drag and increase the effect, shorten the swelling effect

Active Publication Date: 2018-12-11
SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the initial state of drag-reducing polyalphaolefin produced by commercial application of bulk polymerization is a viscoelastic solid. If it is used directly as a drag reducing agent, it will be extremely easy to stick to agglomerates due to the viscoelasticity of the polyalphaolefin particles themselves, making it difficult to disperse stably, which will cause drag reduction. The injection of the drag reducer brings difficulties, and in the oil, because the polyalphaolefin particles stick to each other and form agglomerates, the dissolution rate of the drag reducer particles will directly decrease, the drag reduction efficiency will decrease, and even the pipeline will be blocked

Method used

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  • Polymer drag reducer swelling treatment method for shortening onset time of drag reducer
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  • Polymer drag reducer swelling treatment method for shortening onset time of drag reducer

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Embodiment 1

[0033] Embodiment 1: A kind of polymer drag reducer particle swelling treatment method for shortening the onset time of drag reducer mentioned in the present invention, its preparation method is as follows:

[0034] First, cut the dry bulk drag-reducing polymer solid into 5 cm square pieces, weigh 1 kg, place it in a pressure-resistant and heat-retaining reactor and seal it; then fill the reactor with CO 2 , to reach 6.0MPa, control the temperature at 10 ℃ within 30 minutes, and then refill CO 2 To the set pressure of 7.5MPa (CO at 10°C 2 Critical pressure 7.2MPa), at this time the CO in the kettle 2 It is supercritical and kept for 12 h; after the polymer swells, the CO in the kettle is removed 2 And take out the sample, weigh the weight of the marked sample within 2 minutes to be 1.123 kg; put the swollen drag-reducing polymer into the freezing bucket, then fill it with liquid nitrogen to submerge the polymer, and keep it for 30 minutes. After the liquid nitrogen evaporate...

Embodiment 2

[0035] Embodiment 2: A kind of polymer drag reducer particle swelling treatment method for shortening the onset time of the drag reducer mentioned in the present invention, its preparation method is as follows:

[0036] First, cut the dry bulk drag-reducing polymer solid into 5 cm square pieces, weigh 1 kg, place it in a pressure-resistant and heat-retaining reactor and seal it; then fill the reactor with CO 2 , reach 2.0MPa, control the temperature at -10 ℃ within 30 minutes, and then refill CO 2 To set pressure 4.0MPa (CO at 10°C 2 Critical pressure 4.5MPa), at this time the CO in the kettle 2 It is supercritical and kept for 4 h; after the polymer swells, the CO in the kettle is removed 2 And take out the sample, weigh the weight of the marked sample to be 1.086kg within 2 minutes; put the swollen drag-reducing polymer into the freezing bucket, then fill it with liquid nitrogen to submerge the polymer, and keep it for 10 minutes. After the liquid nitrogen evaporates, Then ...

Embodiment 3

[0037] Embodiment 3: A kind of polymer drag reducer particle swelling treatment method for shortening the onset time of drag reducer mentioned in the present invention, its preparation method is as follows:

[0038] First, cut the dry massive drag-reducing polymer solid into small pieces of 5 cm square, weigh 1 kg, place it in a pressure-resistant and heat-retaining reactor and seal it; then fill the reactor with methanol to reach 0.1 MPa, and then Control the temperature at 0°C within 30 minutes, and then refill methanol to the set pressure of 0.1MPa (the critical pressure of methanol at 10°C is 0.003MPa). At this time, the methanol in the kettle is supercritical and kept for 4 hours; After swelling, remove the methanol in the kettle (pay attention to the recovery of methanol) and take out the sample, weigh the marked sample weight within 2 minutes to 1.026kg; put the swollen drag-reducing polymer into a freezing bucket, and then fill it with liquid nitrogen to Submerge the p...

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Abstract

The invention relates to a polymer drag reducer swelling treatment method for shortening the onset time of a drag reducer. According to the technical scheme, the method comprises the following steps of firstly, cutting a polymer solid body into pieces, and placing the pieces into a reaction still; secondly, filling the reaction still with carbon dioxide to enable the reaction still to be in the supercritical state; thirdly, after polymers swell, deloading the carbon dioxide in the reaction still and taking out samples; fourthly, weighing the samples, and placing the samples into a freezing barrel for low-temperature treatment; fifthly, transferring the samples into a crusher to be roughly broken and ground; and sixthly, adding parting agents, and after ball milling and mixing, obtaining apulpous oil product drag reducer product which takes effect quickly. The polymer drag reducer swelling treatment method for shortening the onset time of the drag reducer has the beneficial effects that treatment is carried out through supercritical fluid before low-temperature crushing to enable the polymers to have the swelling effect and then be subjected to low-temperature crushing and grinding, the technological requirements for sufficient isolation and suspension are met, and therefore, with the treatment method, the time for swelling, dissolution and dispersion of the drag reducer in theoil product can be shortened, and the drag reducer can show the drag reduction and delivery quantity increase effects more quickly.

Description

technical field [0001] The invention relates to the technical field of oil pipeline drag reduction transportation, drag reducer production and post-treatment, in particular to a polymer drag reducer swelling treatment method for shortening the onset time of the drag reducer. Background technique [0002] The addition of drag reducing agent to oil pipelines can increase pipeline throughput without adding additional equipment, or reduce the operating pressure of oil pipelines without reducing the delivery capacity. In the pipeline operation process standards, a complete drag reducing agent has been formed. Process specification. Commercial oil drag reducer is a polyalphaolefin slurry product with a molecular weight of more than 6 million. It dissolves 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 ...

Claims

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Application Information

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IPC IPC(8): F17D1/16
CPCF17D1/16Y02P20/54
Inventor 代晓东刘焕荣李雷刘飞王余宝李敬文
Owner SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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