耐温耐盐淀粉类降滤失剂的改性研究与性能评价

Study on the Modification of High Temperature Salt-tolerant Starch Filtration Reducer

以淀粉(St)为基体,通过引入丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS),合成了St/AM/AMPS接枝共聚物,并通过正交实验对其合成条件进行了优化,然后在此基础上引入阳离子单体丙烯酰氧基三甲基氯化铵(DAC),合成出了一种环保性能好的抗高温抗盐两性离子降滤失剂。通过红外光谱对其结构进行了表征,考察了其降滤失效果并分析了其作用机理。结果表明,加有1%该两性离子改性淀粉降滤失剂的淡水钻井液在150℃老化前后的滤失量分别为7.9 mL和10.9 mL,在160℃老化后的滤失量为12 mL;盐水钻井液老化前后的降滤失效果比较好,但是饱和盐水钻井液老化前后的降滤失效果有待改善;180℃、3.5 MPa下的高温高压滤失量为22 mL;具有较好的抗盐性和抗高温稳定性。

A graft copolymer is synthesized using starch as the base additive and AM and AMPS as graft monomers under optimized synthesizing conditions. The synthesized copolymer is further reacted with cationic monomer, acryloxyltrimethyl ammonium chloride(DAC) to produce an environmental friendly amphoteric filtration reducer with superior high temperature and salt-tolerant performance and good filtration control property. Molecular structure characterization with IR spectroscopy shows that fresh water drilling fluid treated with this synthesized starch filtration reducer has filtration rates before and after aging at 150 ℃ of 7.4 mL and 10.9 mL, respectively. After aging at 160 ℃, the filtration rate is 12 mL. Salt water drilling fluid treated with this starch filtration reducer has better filtration control than saturated salt drilling fluid. HTHP filtration rate at 180 ℃ and 3.5 MPa is 22 mL, showing a good salt tolerance and high temperature performance.