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Carboxylated styrene-butadiene latex for well cementing in oil and gas fields

A carboxylated styrene-butadiene latex, oil and gas field technology, applied in the direction of drilling compositions, chemical instruments and methods, etc.

Inactive Publication Date: 2011-12-07
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 application of domestic latex cement slurry in well cementing is still in the stage of exploration and use

Method used

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  • Carboxylated styrene-butadiene latex for well cementing in oil and gas fields

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Synthesis of carboxylated styrene-butadiene latex: (based on 100 parts in total monomer addition)

[0035] 110 parts of deionized water, 0.60 parts of sodium dodecylsulfate, 0.60 parts of sodium dodecylbenzenesulfonate, and 0.60 parts of nonylphenol polyoxyethylene ether emulsifier were successively put into a 10L jacketed stirring kettle. Parts, Na 2 CO 3 0.30 parts, K 3 PO 4 0.16 parts, 55 parts of styrene, 2.5 parts of acrylic acid, 0.50 parts of (2-acrylamido-2-methyl) propylsulfonic acid, 0.65 parts of tertiary dodecyl mercaptan, 42 parts of butadiene, potassium persulfate Initiator 0.60 parts, heating up to maintain the reaction temperature at 68±3°C. Post-treatment is carried out when the conversion rate reaches above 98%. The various indicators of the latex synthesized at last are as follows:

[0036] Complex total solids (%) Viscosity (mpa.s) Surface Tension (mN / m) PH value Mechanical stability (%) Particle size (nm) Exterior ...

Embodiment 2

[0038]110 parts of deionized water, 0.70 parts of sodium lauryl sulfate, 0.40 parts of sodium dodecylbenzenesulfonate, 0.70 parts of nonylphenol polyoxyethylene ether, Na 2 CO 3 0.30 parts, K 3 PO 4 0.16 parts, 49 parts of styrene, 2.7 parts of acrylic acid, 0.3 parts of sodium p-styrene sulfonate, 0.48 parts of tert-dodecyl mercaptan, 48 parts of butadiene, 0.50 parts of ammonium persulfate initiator, and the temperature was raised to maintain the reaction temperature at 68 ±3°C, when the conversion rate reaches above 98%, post-treatment is carried out. The various indicators of the latex synthesized at last are as follows:

[0039] Carboxylated styrene-butadiene latex performance index

[0040] Complex total solids (%) Viscosity (mpa.s) Surface Tension (mN / m) PH value Mechanical stability (%) Particle size (nm) Exterior 46.87 40.0 37 9.75 0.02 191 milky

Embodiment 3

[0042] 100 parts of deionized water, 0.80 parts of sodium lauryl sulfate, 0.40 parts of sodium dodecylbenzenesulfonate, and 0.60 parts of octylphenol polyoxyethylene ether were successively put into a 10L jacketed polymerization kettle. Na 2 CO 3 0.40 parts, K 3 PO 4 0.16 parts, 46 parts of styrene, 2.10 parts of methacrylic acid, 0.70 parts of (2-acrylamido-2-methyl) propyl sulfonic acid, 0.30 parts of tertiary dodecyl mercaptan, 52.2 parts of butadiene, over 0.45 parts of ammonium sulfate initiator, heat up to maintain the reaction temperature at 68±3°C, add 10 parts of deionized water, 0.20 parts of sodium dodecylbenzenesulfonate, and 0.20 parts of octylphenol polyoxyethylene ether when the reaction reaches 5 hours , maintain the reaction temperature at 68±3°C. When the conversion rate reaches 98%, residual monomers are removed, post-treatment is carried out, and filtration is performed. The various indicators of the latex synthesized at last are as follows:

[0043...

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Abstract

The invention relates to a method for synthesizing special carboxylated styrene-butadiene latex for well cementing in oil and gas fields. Butadiene and styrene are used as main monomers, and carboxylic acids containing unsaturated bonds or sulfonic acids and sulfonic acid salts are used as functional monomers. A composite emulsifier system is used, which is C8~C20 alkyl sodium sulfate-C8~C20 alkylbenzene sulfonate-nonionic emulsifier; the polymerization temperature is 50-90°C, and the polymerization method is that the main monomer is added at one time, and other auxiliary The agent can be added at one time, or it can be divided into several times to add the polymerization method. The carboxylated styrene-butadiene latex obtained by the method of the present invention is prepared with cement and its related additives to prepare the cementing fluid to meet the water loss requirements of the cement slurry in the cementing operation, that is, the water loss is controlled within 50ml / 30min, and this type of latex is suitable for well cementing. , with better economic and social benefits.

Description

technical field [0001] The invention relates to a carboxylated styrene-butadiene latex used as a fluid loss reducer in oil and gas field cementing operations. Background technique [0002] A large number of external cement additives are used in the cementing construction process of the oil exploration industry. Among these external additives, cement slurry fluid loss reducer has great application space in reducing flow loss, free water, improving flow performance, preventing annular air channeling and increasing compressive strength. [0003] In the process of oil extraction, cementing is an important link. The water loss of cement slurry without fluid loss reducer is as high as 1500-2000ml / 30min. A large amount of water loss will cause damage to the production layer and affect the displacement efficiency of cement slurry. Severe water loss may even cause cementing failure and cause huge economic losses. In order to control fluid loss, in the 1960s, foreign countries bega...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F236/10C08F2/26C08F2/30C08F220/06C08F220/54C08K3/32C08K3/26C09K8/487
Inventor 李亮席永盛毛兵任彩霞陈纪明常忠民陆有为齐永新王津生赵以美
Owner BC P INC CHINA NAT PETROLEUM CORP
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