Modified high-water-absorption and high-strength rubber particle plugging agent as well as preparation method and application thereof

A technology of rubber particles and loss-stopping agent, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problems of low toughness and pressure bearing capacity, increase material cost, etc. High capacity, improve compatibility, enhance the effect of adhesion

Active Publication Date: 2022-03-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plugging agent has low toughness and pressure bearing capacity after expansion
[0006] Chinese patent document CN105482784A discloses an oil-based drilling fluid plugging agent, which is prepared from the following components by weight: rigid plugging material: 45.0-60.0 parts; composite fiber material: 10.0-25.0 parts; oil-absorbing swelling material: 10.0 parts ~20.0 parts; Oil-soluble plugging material: 10.0~20.0 parts; Water-absorbing swelling material: 2.5-8.0 parts; Surfactant: 0.5-2.5 parts. , adding composite fibers and rigid materials for compounding and toughening, which increases the cost of materials

Method used

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  • Modified high-water-absorption and high-strength rubber particle plugging agent as well as preparation method and application thereof
  • Modified high-water-absorption and high-strength rubber particle plugging agent as well as preparation method and application thereof
  • Modified high-water-absorption and high-strength rubber particle plugging agent as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0034] According to a typical embodiment of the present invention, a method for modifying high absorption, high strength rubber particles. The preparation method comprises the steps of: a, a plug-in rubber base, a solubilizer, and a water absorbing resin pre-placed in advanced deionized water water absorbent by mass 1: (0.1 ~ 0.5): 0.5 is carried out; B, then join Insoluble sulfur, nano-zinc oxide or magnesium oxide, antioxidants, stearic acids, and accelerators, continue to be mixed for 10 to 15 min, and press the film to stand at room temperature 24 h; C, the refining rubber sheet is 10 in vulcanization ~ 15MPa, the vulcanization temperature is from 20 to 160 ° C for 20 to 30 min, and the end of the vulcanization is 24 h, and the high absorbent rubber particles are degraded, and the high absorbent rubber particles are obtained; preferred, step A, mixed speed 30 ~ 45R / min, the shaft distance is 2 ~ 4mm, the operating temperature is 100 ~ 120 ° C, the kneading time is 10 ~ 15 mi...

Embodiment 1

[0044] Preparation of solubilization:

[0045] The raw materials include nitrile rubber, toluene, acrylic acid, azoisoisobutyronitrile, 900% of toluene nitrile rubber, 100% of toluene nitrile rubber, 100% of nitric nitrile rubber, and azo diisobutyronitrile content is 0.3%.

[0046] The synthesis process of the solubilizer is as follows:

[0047] (1) It is weighing the nitrile rubber substrate to cut into a small particle, and the ultrasonic oscillation is dissolved in toluene.

[0048] (2) Acrylic acid, azo diisobutyronitrile was added, and heated with a water bath was heated 60 ° C, and the heating time was 4 h.

[0049] (3) Removing the reaction generated by the reaction to be placed at 60 ° C drying tank for drying to a constant mass, and then pulverizing the dried rubber block after drying using a Sodide extractor with deionized water to extract 36h, and place insolubles Vacuum drying under 100 psi vacuum pressure is dried, and the product of constant mass is a solubilizer.

...

Embodiment 2

[0075] The preparation of the solubilizer is in Example 1.

[0076] Preparation of Sodium Polyacrylate Water Resin As Example 1.

[0077] Preparation of modified high water absorption, high strength rubber particles

[0078] The rubber particle plugging agent is that the rubber substrate is obtained with water-absorbent resin under the action of the water-absorbent resin, including rubber base, absorbent resin, solubilizer, insoluble sulfur, nano zinc oxide or magnesium oxide, antioxidant, hard fat Acid and accelerator, with a rubber matrix mass mass, the water absorbing resin is 50% of the rubber substrate, the solubility content is 5%, the insoluble sulfur content is 3%, the nano-zinc oxide content is 3%, the antioxidant Rd content is 1 %, Stearic acid content is 3%, the vulcanization accelerator Na-22 content is 3%.

[0079] The preparation method of modified high water absorption, high-strength rubber particles plugging agent is carried out in Example 1.

[0080] This example ...

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Abstract

The invention discloses a modified high-water-absorption and high-strength rubber particle plugging agent as well as a preparation method and application thereof. The rubber particle plugging agent is obtained by grafting a rubber matrix and water-absorbent resin under the action of a solubilizer, and the rubber particle plugging agent comprises the following raw materials in percentage by mass: 30-60% of water-absorbent resin, 10-30% of solubilizer, 10-30% of insoluble sulfur, 5-10% of nano zinc oxide or magnesium oxide, 5-10% of antioxidant, 5-10% of stearic acid and 5-10% of accelerant. The content of the solubilizer is 3%-8%, the content of the insoluble sulfur is 1%-3%, the content of the nano zinc oxide or magnesium oxide is 1%-5%, the content of the antioxidant is 0.5%-1.5%, the content of the stearic acid is 1%-5%, and the content The plugging agent disclosed by the invention gradually absorbs water to swell in a leakage channel, has relatively high water absorption rate, is insoluble in water, can still keep relatively high toughness and strength after reaching water absorption expansion balance, and has relatively high loading capacity and high plugging strength.

Description

Technical field [0001] The present invention relates to the field of petroleum exploration and development, and in particular, a modified high-absorbing, high-strength rubber particles plug-in agent, preparation method thereof, and application thereof. Background technique [0002] Light drain is due to positive pressure difference between the oil and gas well and the formation, the drilling fluid passes through microcrack and pore intrusion under normal pressure difference, and the diafiltration enters the formation. It has always been very common and difficult to handle in the drilling process. Well, drain, not only reduces the speed of drilling, consumes a lot of work time, lost the number of materials and drilling fluids, may also cause a series of complex accidents such as blowout, well collapse, and the most serious will lead to the scrapping of the entire wellbore. And the people have a great property loss. In fluid, cracks, cavity leaks, this type of loss is high, and thi...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/512C08F251/00C08F220/06C08F279/02E21B33/13
CPCC09K8/426C09K8/512C09K8/887C09K8/905C08F251/00C08F279/02E21B33/13C08F220/06Y02P20/141
Inventor 柳丙善王玺张顺元吕开河叶禹白英睿杨国彬张国斌付晋
Owner BC P INC CHINA NAT PETROLEUM CORP
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