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A biphenyl hydrophobic monomer and leakage plugging gel based on the monomer

A technology of hydrophobic monomer and bis-phenyl, applied in the field of plugging gel and bis-phenyl hydrophobic monomer, can solve the problems of false plugging, plugging failure, leakage, etc., achieves low cost, is beneficial to industrial production and production simple craftsmanship

Active Publication Date: 2018-02-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When bridge plugging encounters large fractures and many fractures, it is difficult to form a plugging layer around the wellbore, and false plugging is easy to occur. After recovery drilling, the false plugging layer is stirred by the drilling tool and washed by the drilling fluid and is destroyed, causing another leak
Although cement slurry plugging can reduce the incidence of false plugging, when there is a lot of formation fluid, the unsolidified cement will be diluted by the formation fluid, resulting in plugging failure

Method used

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  • A biphenyl hydrophobic monomer and leakage plugging gel based on the monomer
  • A biphenyl hydrophobic monomer and leakage plugging gel based on the monomer
  • A biphenyl hydrophobic monomer and leakage plugging gel based on the monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of Biphenyl Hydrophobic Monomer (n=1)

[0048] Add 600g acetone and 20.63g p-tertoctylphenol in a dry three-necked flask with stirrer, condenser and dropping funnel, add 21.13g of 3-isopropenyl-dimethylbenzyl isocyanate in the dropping funnel, start Stir until the p-tetylphenol in the flask is fully dissolved. The water bath was heated to 53° C., and a vacuum was applied for 2 hours while heating to remove moisture in the flask. Then add 0.0169g of dibutyltin dilaurate under the protection of nitrogen, and drop the 3-isopropenyl-dimethylbenzyl isocyanate in the dropping funnel into the three-necked flask, react for 7.5 hours, and distill under reduced pressure to remove Acetone, that is, the crude product of the monomer is obtained. The crude product was rinsed with chloroform three times, placed in an oven at 65°C and dried to constant weight to obtain the target product.

Embodiment 2

[0050] Preparation of Biphenyl Hydrophobic Monomer (n=4)

[0051] Add 600g toluene and 24.84g 4-(1,1,6,6-tetramethylheptyl)phenol into a dry three-necked flask with a stirrer, condenser and dropping funnel, add 21.13g of 3 -Isopropenyl-dimethylbenzyl isocyanate, start stirring until the 4-(1,1,6,6-tetramethylheptyl)phenol in the flask is fully dissolved. The water bath was heated to 79°C, and a vacuum was applied for 2 hours while heating to remove moisture in the flask. Then add 0.0169g dibutyltin dilaurate under the protection of nitrogen, and drop the 3-isopropenyl-dimethylbenzyl isocyanate in the dropping funnel into the three-necked flask, react for 10 hours, and distill under reduced pressure to remove Toluene, the crude product of the monomer is obtained. The crude product was rinsed with chloroform three times, placed in an oven at 65°C and dried to constant weight to obtain the target product.

Embodiment 3

[0053] Preparation of plugging gel (n=1)

[0054] Add 14.22g of acrylamide, 28.82g of acrylic acid, 31.09g of 2-acrylamido-2-methylpropanesulfonic acid, 6.17g of N,N-methylenebisacrylamide and 1500g of water into the reactor, stirring until completely dissolve. The pH of the solution was adjusted to 8.5 with a NaOH solution having a mass concentration of 50.0%. Add 4.08g of the diphenyl hydrophobic monomer prepared in Example 1 and 48.0g of sodium octadecyl sulfate under stirring conditions, continue to stir, solubilize the hydrophobic monomer in the sodium octadecyl sulfate micelles, and then pass nitrogen 60 minutes to remove dissolved oxygen in the solution. Add 1.0g K 2 S 2 o 8 , and then continue to pass nitrogen and heat up to the predetermined reaction temperature of 40 ° C, and react for 12 hours to obtain a gelatinous product. Wash with absolute ethanol, pulverize and dry to obtain the target product.

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Abstract

The invention provides a bis-phenyl hydrophobic monomer and a preparation method of the monomer, wherein the structural formula of the monomer is as shown in the formula I. The invention also provides plugging gel, which is prepared from reaction raw materials comprising alkenyl amide, alkenyl carboxylate, alkenyl sulfonate, a crosslinking agent, the monomer and an initiator by a free-radical micelle polymerization method. The plugging gel has high shear dilutability 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, in particular to a biphenyl hydrophobic monomer and leakage plugging gel based on the monomer. Background technique [0002] Lost circulation in drilling engineering generally refers to the phenomenon that drilling fluid leaks from the wellbore into the formation. It usually occurs during the drilling process or during the tripping process. It is a common problem encountered in the oil and gas drilling process. In drilling operations, once lost circulation occurs, it will not only delay the construction period, lose drilling fluid, damage oil and gas layers, and interfere with geological logging, but also may cause a series of complex situations such as well wall instability, drill sticking, and well collapse, and even lead to borehole failure. scrapped, resulting in significant economic losses. [0003] Among various plugging methods, bridge plugging and cement slurry plugging are the most co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C271/44C07C269/02C08F220/56C08F220/06C08F220/58C08F222/38C08F220/54C08F212/14C08F222/14C09K8/40C09K8/44
Inventor 褚奇
Owner CHINA PETROLEUM & CHEM CORP
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