为了解决高寒地区冬季固井施工中液体降失水剂易结冰的问题,在聚乙烯醇交联反应中通过引入冰点降低剂并控制交联反应的交联度,合成了在低温下具有适度流动性和良好降失水性能的JYC降失水剂.通过室内试验对JYC降失水剂的抗冻性能、JYC降失水剂加量对水泥浆性能的影响及海水对JYC水泥浆性能的影响进行了评价,结果表明:JYC降失水剂可以在-20℃的环境下使用；随着JYC降失水剂加量的增加,水泥浆的失水量逐渐降低,但其加量超过8％时,失水量的降低幅度很小;随着JYC降失水剂加量的增加,水泥浆的稠度略微增大,稠化时间稍有延长,但对其抗压强度无不良影响；采用海水和部分海水配浆,JYC水泥浆的失水量会增大,但仍小于50 mL,水泥浆会增稠,其抗压强度有一定提高.在吉林松南区块的应用表明,JYC降失水剂不但解决了高寒地区冬季固井施工中液体降失水剂易结冰的问题,而且固井质量也得到了提高.%In order to solve the problem of frozen of cementing filtration control agent in winter,adding the freezing point depressant and controlling the degree of crosslinking in the cross-linking reaction of PVA formed the JYC filtration control agent,which has good fluidity and filtration control function at low temperature. Through laboratory test, the frost resistance of filtration control agent and the effect of adding JYC on cement slurry properties,as well as seawater's effect on the JYC cement slurry has been estimated. The results show that JYC can be used in -20℃ ;the filtrate loss can be reduced with the increase of JYC, but when JYC's volume is more than 8%,the filtrate loss reduced slightly. With the increase of JYC's volume, the consistency of cement slurry is increasing, and thickening time prolongs, while the compressive strength is not affected. Using the sea water to make JYC slurry can increase the filtrate loss while still less than 50 Ml, thickens the slurry, and raise compressive strength. The application in Jilin Songnan shows that JYC can solve the problem of frozen of filtration loss additives in extremely cold zones and improve cementing quality.
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