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Hydrophobic monomer and hydrogel for drilling plugging based on the monomer

A technology of hydrophobic monomer and hydrogel, which is applied in the field of hydrogel and hydrophobic monomer for drilling plugging, which can solve the problems of plugging failure, repeated leakage, poor deformability, etc.

Active Publication Date: 2017-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that compared with organic gel plugging materials, other plugging materials generally have the disadvantage of poor deformability. If their particle size is slightly larger than the size of the leakage layer or does not match the shape and cracks of the leakage layer, it is not suitable to enter Leaky layer, but only accumulation on the surface of the leaky layer, it is very easy to cause repeated leakage or directly cause plugging failure

Method used

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  • Hydrophobic monomer and hydrogel for drilling plugging based on the monomer
  • Hydrophobic monomer and hydrogel for drilling plugging based on the monomer
  • Hydrophobic monomer and hydrogel for drilling plugging based on the monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Preparation of hydrophobic monomers

[0062] Add 2850 mL of xylene and 66.04 g of compound II (m=10) into a dry three-neck flask equipped with a stirrer, condenser and dropping funnel, and add 114.45 g of isophorone diisocyanate into the dropping funnel. Stir until compound II in the flask is fully dissolved. Then the water bath was heated to a temperature of 54° C., and a vacuum was applied for 2.0 hours while heating to remove moisture. Under nitrogen protection, 0.08 g of dibutyltin dilaurate was added. The isophorone diisocyanate in the dropping funnel was dropped into the three-necked flask, and reacted for 3.5 hours under stirring conditions. Then the reaction temperature was raised to 65° C., under nitrogen protection conditions, 0.0572 g of dibutyltin dilaurate and 50.55 g of N-methylolacrylamide were added respectively, and the stirring reaction was continued for 4.5 hours. After the reaction, the acetone was distilled off under reduced pressure to obtain a ...

Embodiment 2

[0064] Preparation of hydrogel

[0065] 14.22g of acrylamide, 32.43g of sodium methacrylate, 22.93g of 2-acrylamide-2-methylpropanesulfonate and 800mL of water were successively added into the reactor, and stirred until completely dissolved. Then add the hydrophobic monomer prepared by 2.96g embodiment 1 and 36.35g sodium dodecylbenzenesulfonate, continue to stir so that the hydrophobic monomer is solubilized in the sodium dodecylbenzenesulfonate micelle, logical nitrogen for 30 minutes Evacuate the air. Add 0.7254g (NH 4 ) 2 S 2 o 8 , and the temperature was raised to 40° C. under the condition of continuing nitrogen flow, and the reaction was continued for 12 hours to obtain a gel-like product. Wash with absolute ethanol, pulverize and dry to obtain the target product.

Embodiment 3

[0067] Preparation of hydrogel

[0068] Add 34.70g of N,N-dimethylacrylamide, 47.02g of sodium acrylate, 30.93g of sodium p-styrenesulfonate and 2140mL of water into the reactor in sequence, and stir until completely dissolved. Then add the hydrophobic monomer prepared by 9.84g embodiment 1 and 46.18g sodium octadecylbenzenesulfonate, continue to stir so that the hydrophobic monomer is solubilized in the sodium octadecylbenzenesulfonate micelle, logical nitrogen for 30 minutes Evacuate the air. Add 1.68g (NH 4 ) 2 S 2 o 8 , and the temperature was raised to the predetermined reaction temperature of 55° C. under the condition of continuing nitrogen flow, and the reaction was continued for 8 hours to obtain a gel-like product. Wash with absolute ethanol, pulverize and dry to obtain the target product.

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Abstract

The invention provides a hydrophobic monomer and a preparation method thereof, wherein the structural formula of the monomer is as shown in the formula I. The invention also provides hydrogen for drilling leaking stoppage, which is prepared from reaction raw materials comprising alkenyl amide, alkenyl carboxylate, alkenyl sulfonate, a surfactant, the monomer and an initiator by a free-radical micelle polymerization method. The hydrogel has high apparent viscosity and high shear dilutability under a low shear rate before gelatinization, has excellent dilution resistance after gelatinization, has the advantages of simple production process and low cost, and is favorable for industrialized production and on-site popularization and application.

Description

technical field [0001] The invention belongs to the field of petroleum additives, and relates to a hydrophobic monomer and a hydrogel for drilling leakage plugging based on the monomer. Background technique [0002] In drilling engineering, lost circulation refers to the phenomenon that drilling fluid leaks from the wellbore into the formation, which is a common downhole complex accident. With the gradual increase of drilling workload in complex oil and gas reservoirs in recent years, a series of problems caused by lost circulation have become increasingly prominent, mainly reflected in the extension of drilling cycle, loss of drilling fluid, collapse of well wall, stuck pipe and even scrapped wellbore, etc., resulting in huge losses. Economic losses. Among the various types of leakage, the malignant leakage caused by natural fractures and caves is the most difficult to solve. [0003] For a long time, in view of different vicious leakage situations, engineers and technici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C271/20C07C269/02C09K8/44C08G65/00C08F283/06
Inventor 褚奇刘四海薛玉志
Owner CHINA PETROLEUM & CHEM CORP
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