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Hydrophobic monomer and hydrogen for drilling leaking stoppage based on monomer

A hydrophobic monomer and alkenyl amide technology, applied in the field of petroleum additives, can solve the problems of plugging failure, repeated leakage, poor deformability, etc.

Active Publication Date: 2017-01-25
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 hydrogen for drilling leaking stoppage based on monomer
  • Hydrophobic monomer and hydrogen for drilling leaking stoppage based on monomer
  • Hydrophobic monomer and hydrogen for drilling leaking stoppage based on monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Preparation of hydrophobic monomer

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

Embodiment 2

[0064] Preparation of hydrogel

[0065] 14.22g of acrylamide, 32.43g of sodium methacrylate, 22.93g of sodium 2-acrylamide-2-methylpropanesulfonate and 800mL of water were sequentially added into the reactor, and stirred until completely dissolved. Then, 2.96g of the hydrophobic monomer prepared in Example 1 and 36.35g of sodium dodecylbenzene sulfonate were added, and stirring was continued to solubilize the hydrophobic monomer in the micelles of sodium dodecylbenzene sulfonate. Nitrogen was applied for 30 minutes. Vent the air. Add 0.7254g(NH 4 ) 2 S 2 O 8 , And the temperature is increased to 40°C under the condition of continuous nitrogen flow, and the reaction is continued for 12 hours to obtain a colloidal product. The target product can be obtained by washing with absolute ethanol, crushing, and drying.

Embodiment 3

[0067] Preparation of hydrogel

[0068] 34.70g of N,N-dimethylacrylamide, 47.02g of sodium acrylate, 30.93g of sodium p-styrene sulfonate and 2140mL of water were sequentially added into the reactor, and stirred until completely dissolved. Then add 9.84 g of the hydrophobic monomer prepared in Example 1 and 46.18 g of sodium octadecyl benzene sulfonate, continue to stir to solubilize the hydrophobic monomer in the micelles of sodium octadecyl benzene sulfonate, and blow nitrogen for 30 minutes. Vent the air. Add 1.68g(NH 4 ) 2 S 2 O 8 , And under the condition of continuous nitrogen flow, the temperature is raised to the predetermined reaction temperature of 55 DEG C, and the reaction is continued for 8 hours to obtain a colloidal product. The target product can be obtained by washing with absolute ethanol, crushing, and drying.

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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 based on the monomer. Background technique [0002] In drilling engineering, lost circulation refers to the phenomenon of drilling fluid leaking into the formation from the wellbore, which is a common downhole complex accident. With the gradual increase in drilling workload in complex oil and gas reservoirs in recent years, a series of problems caused by lost circulation have become increasingly prominent. They are mainly reflected in prolonged drilling cycle, loss of drilling fluid, well wall collapse, stuck drilling and even borehole scrapping, etc., causing huge problems. Economic losses. Among the various types of leakage, malignant leakage caused by natural cracks and caves is the most difficult to solve. [0003] For a long time, in response to different malignant leakage situations, engineers and technicians have optimiz...

Claims

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Application Information

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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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