水基钻井液用抗高温降滤失剂的合成及性能评价

Synthesis and Evaluation of a High Temperature Water Base Drilling Fluid Filter Loss Reducer

针对牛东区块钻探过程中使用的抗高温降滤失剂价格高、增加生产成本的问题,开发了高温性能稳定且成本相对低廉的钻井液用抗高温降滤失剂BZ-HTF。用单因素实验法优选出最优合成参数:单体浓度为30%,反应时间为4 h,反应温度为55℃,引发剂用量为0.10%,AM、AMPS和IA质量比为42∶40∶18,水解度为30%。BZ-HTF抗温达220℃,且性能稳定;在淡水、盐水、复合盐水和饱和盐水基浆中均具有较好的降滤失能力,且对钻井液黏度、切力影响不大;与国外产品Driscal D性能相当,但商品估价只有其四分之一,具有较好的发展前景。

A high temperature water base drilling fluid filter loss reducer,BZ-HTF,was developed for use in Block Niudong,Qinghai.BZ-HTF was synthesized with monomers AM,AMPS and IA in a mass ratio of 42：40：18,and initiator concentration of 0.10%.Total concentration of the monomers was 30%.The reaction lasted for 4 hours at 55℃.BZ-HTF has a degree of hydrolysis of 30%,and remains effective at temperatures as high as 200℃.It has good filtration control capacity in fresh water base mud,brine mud and saturated saltwater mud,and does not greatly increase the viscosity and gel strengths of the muds.BZ-HTF has filtration control capacity comparable to Drispac D,while its cost is only one fourth of the latter.