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发明公开
CN104178094A 复合型油井水泥降滤失剂及其制法 无效 - 驳回

复合型油井水泥降滤失剂及其制法
摘要：
本发明涉及一种油田化学品，具体是一种复合型油井水泥降滤失剂及其制法，其特征是，由如下重量份数的原料复合而得：丙烯酰胺-丙烯酸盐共聚物1-2份，2-丙烯酰胺基-2-甲基丙磺酸甲醛缩合物1-2份，[CH3CH(OH)CH(OH)(CH2)nO(CH2)mOH]x0.2～0.6份，柠檬酸1-3份，赤泥粉0.1～0.2份；其中，所述丙烯酰胺-丙烯酸盐共聚物的平均分子量为1～10×106，其中，n为3-10的整数，m为2-5的整数，[CH3CH(OH)CH(OH)(CH2)nO(CH2)mOH]x的平均分子量为20000-30000。与现有技术相比，本发明的产品耐高温性能好、水泥浆流动性好，赤泥成分有利于降滤失剂滤饼形成并能在产品贮存过程中起到光遮蔽剂作用。
摘要（英）：

The invention relates to an oil field chemical product and particularly relates to a composite-type oil well cement filtrate reducer and a preparation method thereof. The oil well cement filtrate reducer is characterized by being compounded of the following raw materials in parts by weight: 1-2 parts of acrylamide-acrylate copolymer, 1-2 parts of 2-acrylamido-2-methylpropane sulfonic acid formaldehyde condensate, 0.2-0.6 part of [CH3CH(OH)CH(OH)(CH2)nO(CH2)mOH]x, 1-3 parts of citric acid and 0.1-0.2 part of red mud powder, wherein the average molecular weight of the acrylamide-acrylate copolymer is 1-10*10<6>, n is an integer between 3 and 10, m is an integer between 2 and 5 and the average molecular weight of [CH3CH(OH)CH(OH)(CH2)nO(CH2)mOH]x is 20,000-30,000. Compared with the prior art, the product prepared by the oil well cement filtrate reducer disclosed by the invention has the advantages of good high-temperature resistance and can ensure good fluidity of cement slurry, the red mud component is conductive to the formation of a filtrate reducer cake and takes the effect of a light-blocking agent in the storage process of the product.

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