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Shell-membrane structure plugging material and preparation method thereof

A technology of plugging material and shell membrane, which is applied in the field of drilling and plugging, and can solve the problems of repeated leakage and the inability of plant shell granular materials to be immersed in liquid.

Active Publication Date: 2020-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem in the prior art that the plant shell granular material is not resistant to liquid immersion in the above-mentioned bridge plugging process, the present invention proposes a plugging material with a shell-membrane structure
The invention grafts hydrophobic groups and water-soluble polymers to the surface of plant shells to form a layer of hydrophobic protective film on the surface of the shells, thereby greatly improving the water resistance of the shells and greatly improving the strength of granular materials when plugging , so as to solve the problem of re-leakage easily caused by using plant shell materials to plug leaks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Step 1: Synthesis of grafted modified shell particles

[0051] Step S1, take 5g dried walnut shells with a particle size of 2mm, add 50mL organic solvent N,N-dimethylformamide, heat to 80°C, and slowly add 0.2mol epichlorohydrin dropwise, and react for 4h Afterwards, unreacted epichlorohydrin was distilled off under reduced pressure. After cooling to 40°C, 0.5 mol tetradecanoyl chloride was continued to be added dropwise, reacted for 3 hours, cooled to room temperature and filtered. The product was successively washed with dilute sodium hydroxide, dilute hydrochloric acid, and deionized water. Wash and dry naturally, and collect for later use.

[0052] Step S2, take 5g of the modified walnut shell obtained from S1 and add it to a 100mL three-necked flask, then add 50mL of dichloromethane, 2g of NaOH, and 0.4g of tetrabutylammonium bromide, stir to raise the temperature to 50°C, and dropwise add 0.2mol molecular weight 500% allyl polyethylene glycol, then heated up to 5...

Embodiment 2

[0058] Step 1: Synthesis of grafted modified shell particles

[0059] Step S1, take 5g dried jujube shells with a particle size of 3mm, add 50mL organic solvent N,N-dimethylformamide, heat to 100°C, and slowly add 0.25mol epichlorohydrin dropwise, react for 8h under reduced pressure Remove unreacted epichlorohydrin by distillation, continue to drop 0.25mol hexadecanoyl chloride after cooling to 20°C, react for 6 hours, cool to room temperature and filter, the product is washed with dilute sodium hydroxide, dilute hydrochloric acid, deionized water successively and allowed to dry Air dry and collect for later use. Step S2, take 5g of the modified jujube husk obtained from S1 and add it to a 100mL three-necked flask, then add 50mL of dichloromethane, 2g of NaOH, and 1g of tetrabutylammonium chloride, stir and heat up to 50°C, and dropwise add 100g of The allyl polyethylene glycol is heated to 60°C, reacted for 6 hours and then cooled. After the product is suction filtered, it i...

Embodiment 3

[0071] Step 1: Synthesis of Branched Modified Shell Granular Materials

[0072] Step S1, take 5g dried apricot shells with a particle size of 2mm, add 50mL organic solvent N,N-dimethylformamide, heat to 90°C, and slowly add 0.35mol epichlorohydrin dropwise, and react for 5h Remove unreacted epichlorohydrin by pressure distillation, continue to drop 0.25mol hexadecanoyl chloride after cooling to 30°C, react for 5h, cool to room temperature and filter, the product is washed with dilute sodium hydroxide, dilute hydrochloric acid, deionized water successively Air-dry naturally and collect for later use.

[0073] Step S2, take 5g of the modified apricot shell obtained from S1 and add it to a 100mL three-necked flask, then add 50mL of dichloromethane, 1.5g of NaOH, and 1.5g of tetrabutylammonium chloride, stir to raise the temperature to 50°C, and dropwise add 70g of molecular weight Allyl polyethylene glycol at 700°C is heated to 60°C, reacted for 6 hours and then cooled. After th...

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Abstract

The invention relates to a shell-membrane structure plugging material and a preparation method thereof in the technical field of well drilling plugging. The shell-membrane structure plugging materialis a polymer-coated shell particle plugging material obtained by grafting a hydrophobic group and a water-soluble polymer to the surface of a plant shell. The preparation method of the plugging material with the shell-membrane structure comprises the following steps: grafting a hydrophobic group and a carbon-carbon double bond to the surface of a plant shell, and carrying out emulsion polymerization on the obtained grafted modified shell particle material, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and a cationic monomer to obtain the shell-membrane structure plugging material. According to the invention, a hydrophobic group and a water-soluble polymer are grafted to the surface of a plant shell, and a hydrophobic protective film is formed on the surface of the shell, so that the water soaking resistance of the shell is greatly improved, the strength of the granular material can be greatly improved during leakage stoppage, and the problem of repeated leakage easily caused byleakage stoppage of plant shell materials is solved.

Description

technical field [0001] The invention relates to the technical field of drilling plugging, and more particularly relates to a plugging material with a shell membrane structure and a preparation method thereof. Background technique [0002] Lost circulation is a technical problem often encountered in the drilling process. Lost circulation not only increases drilling costs, but also seriously restricts drilling speed, and even causes a series of complications such as pipe sticking, blowout, and well wall instability. Among various plugging technologies, bridging plugging technology is most widely used, accounting for about 80% of the entire plugging construction. Bridging plugging materials are divided into three categories according to their appearance: granular, flake and fibrous materials. In the plugging operation, these three types of materials have limited effects when used alone, and cannot effectively plug the leaky layer. They must be combined in a reasonable proporti...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/467C08F283/00C08F220/58C08F220/56C08F220/34C08G81/00
CPCC09K8/426C08F283/00C08G81/00C08F220/56Y02W30/91
Inventor 曾义金李凡李大奇金军斌刘金华王伟吉
Owner CHINA PETROLEUM & CHEM CORP
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