Carboxylated styrene-butadiene rubber latex special for oil and gas field cementing well

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: 2010-06-30
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 rubber latex special for oil and gas field cementing well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Synthesis of carboxylated styrene-butadiene latex: (based on 100 parts in total monomer addition)

[0034] 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:

[0035] Complex total solids

Embodiment 2

[0037]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:

[0038] Carboxylated styrene-butadiene latex performance index

[0039] Complex total solids

Embodiment 3

[0041] 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:

[0042...

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Abstract

The invention relates to a synthetic method of carboxylated styrene-butadiene rubber latex special for an oil and gas field cementing well by using butadiene and styrene as main monomers, using carboxylic acid containing unsaturated links or/and sulfuric acid and sulphonate as functional monomers and adopting a composite emulsifier system as a nonionic emulsifier of C8-C20 sodium alkyl sulfate-c8-c20 sodium alkylbenzene sulfonate at a polymerization temperature of 50-90 DEG C in a polymerization mode, i.e. the main monomers are added in one step, and the other assistants can be added in one step or a plurality of times. The carboxylated styrene-butadiene rubber latex obtained by the method of the invention is compounded with cement and other related assistants into well-cementing liquid so as to satisfy the grout-dehydrating requirement in the well-cementing operation, i.e. the water loss is controlled within 50ml/30min. The rubber latex is suitable for cementing wells and has favorable economic benefits 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 Applications(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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