The invention discloses a water-based carrying nitric acid powder for acidizing plugging removal and its manufacturing method. First, nitric acid solution and carboxamide are added into the buffer solution system, which is a mixture of acetic acid and sodium acetate solution. The mass ratio of the buffer solution is 1:1, and the intermediate urea nitrate is obtained by stirring uniformly at room temperature. Then, the reacted material is put into a centrifuge, the waste acid solution is thrown off, and dried. When CM 911 solid phosphorus-free inhibitor is added, water-based nitric acid powder for acidizing and blockage removal of finished products can be obtained by stirring uniformly; or CM 911 solid phosphorus-free inhibitor with 0.1%~2.0% of the total amount of urea nitrate can be packed separately into product bags of intermediate urea nitrate and mixed with intermediate urea nitrate evenly to obtain water-based nitric acid powder for acidizing and blockage removal of finished products. The preparation method of the invention is simple and practical, and the solid white powder is inactive in solid state, non-corrosive, easy to transport, and the product price is low. When water is used, it is hydrolyzed into nitric acid, which is an ideal material for acidizing and plugging removal in oil field production.
【技术实现步骤摘要】
一种酸化解堵用水基携带硝酸粉末的制造方法
本专利技术涉及石油开采用的一种化工产品,更具体的说是一种酸化解堵用水基携带硝酸粉末的制造方法。
技术介绍
现有的硝酸粉末化技术是90年代从乌克兰引进的,固体硝酸呈白色粉末,非活性,不溶于油基(如脱水原油和柴油等),而易溶于水基(如水、乙醇等);在水中的溶解度随温度升高而增大,可分解出强氧化性的HNO3。目前,常规的方法是将非活性硝酸粉末用原油作载体挤入地层,这种方法成本高,而且工序复杂。当酸液量或浓度匹配不当时,会造成新的沉淀堵塞,产生二次沉淀,造成二次污染。
技术实现思路
本专利技术的目的在于克服传统公用酸化用溶液的上述缺点,提供一种酸化解堵用酸化解堵用水基携带硝酸粉末的制造方法。实现上述专利技术目的技术解决方案是:一种酸化解堵用水基携带硝酸粉末及其制造方法,其特征在于,首先将硝酸溶液和碳酰胺加入缓冲溶液体系,缓冲溶液体系为醋酸与醋酸钠溶液混合而成,其质量比为1∶1,室温搅拌均匀反应,得中间体硝酸脲;然后将反应后的中间体硝酸脲投入离心机中,甩掉废酸液,干燥后再加入CM-911型固体无磷缓蚀剂,搅拌均匀即得酸化解堵用水基携带硝酸粉末成品。其工艺过程按以下步骤进行:1)取40%~50%浓度的硝酸溶液和碳酰胺,其质量比为1∶1~3∶1;2)将上述硝酸溶液加入碳酰胺中,然后另外添加上述硝酸溶液和碳酰胺总量的0.3%~1%的缓冲溶液体系,缓冲溶液体系为醋酸与醋酸钠溶液混合而成,其质量比为1∶1,室温搅拌均匀,静置12h~36h,使其充分反应;3)反应后将中间体硝酸脲投入离心机中,甩掉废酸液,即得中间体硝酸脲;4)将中间体硝酸脲 ...
【技术保护点】
1.一种酸化解堵用水基携带硝酸粉末及其制造方法,其特征在于,首先将硝酸溶液和碳酰胺加入缓冲溶液体系,室温搅拌均匀反应,得中间体硝酸脲;然后将反应后的中间体硝酸脲投入离心机中,甩掉废酸液,干燥后再加入CM‑911型固体无磷缓蚀剂,经搅拌均匀即得酸化解堵用水基携带硝酸粉末成品。
【技术特征摘要】
1.一种酸化解堵用水基携带硝酸粉末及其制造方法,其特征在于,首先将硝酸溶液和碳酰胺加入缓冲溶液体系,室温搅拌均匀反应,得中间体硝酸脲;然...
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