抗钙钻井液降滤失剂P(AMPS-DEAM)聚合物的合成

Synthesis of the P(AMPS-DEAM)polymer used as loss additive for anti-calcium drilling fluid

采用氧化-还原引发体系,以N,N-二乙基丙烯酰胺和2-丙烯酰基-2-甲基丙磺酸为原料,合成了P(AMPS-DEAM)共聚物抗高温抗钙钻井液降滤失剂。通过正交实验优化了配方及合成条件:m(DEAM):m(AMPS)=0.9:1、反应温度40℃、单体质量分数25%、引发剂用量0.22%,用红外光谱对聚合物的结构进行了表征,初步评价了共聚物的钻井液性能。结果表明,P(AMPS-DEAM)共聚物热稳定性好,作为钻井液处理剂,在淡水、盐水、饱和盐水和CaCl_2钻井液中均具有较好的降滤失作用。经过180℃超高温老化后仍能较好地控制钻井液的滤失量,体现出了良好的抗温、抗盐和抗钙性能。

The 2-acrylamido-2-methylpropanesulfonic acid/N,N-diethylacrylamide copolymer（P（AMPS-DEAM））, as high temperature resistance and salt resistance loss additive for drilling fluid,was synthesized using N,N-diethylacrylamide,acrylamide and 2-acrylamido-2-methylpropanesulfonic acid by oxidation-reduction initiating system.The study was employed the orthogonal design to optimize the experimental formulations and synthesis conditions.Optimum condition are as follow：m（DEAM）：m（AMPS）=0.9：1,reaction temperature is 40℃,the monomer mass fraction is 25%,the amount of initiator is 0.22%.The structure of the polymer was researched by IR,and the properties of drilling fluids of the copolymers was evaluated in laboratory.The results show that P（AMPS-DEAM） copolymer,as drilling fluid additives,has excellent thermal stability and filtrate loss reduction,whatever in fresh water,salt,saturated brine and CaCl_2 solution,moreover,it has better capacities of filtrate loss reduction after aging at 180℃,which show good resistance to temperature,salt and calcium.