摘要
为改善固井质量,解决低压易漏井固井水泥浆漏失和对油气层的伤害,研制出一种漂珠微硅复合低密度水泥浆体系。确定了此水泥浆体系的最佳配方:漂珠加量90 g,微硅加量30 g,降失水剂加量1.7%,分散剂加量1.3%,早强剂CSA-1加量1.4%,消泡剂Fry加量0.2%。室内研究结果表明,当电压为7 V时,该水泥浆体系的稠度为27 BC,稠化时间为170 min(稠化时间较短);流动指数n为0.553,API失水量为90.0 mL,游离液含量仅为0.1 mL,24 h抗压强度为15.08 MPa,可满足低压易漏及欠平衡钻井的固井要求。
To improve well cementation and eliminate the leakage of the cement slurry for cementing low pressure easily leaky wells and the resultant damage to oil and gas reservoir, a low density cement slurry system mixed with floating potential and microsilica was developed. The optimum formulation of this cement slurry system was identified： addition of fluid loss agent： 1.7%, addition of dispersant： 1.3%, addition of early strength agent CSA - 1 ： addition of defoamer Fry ： 0.2%. According to the results of laboratory study, when the voltage is 7 V, the consistency of this cement slurry system is 27 BC, the thickening time is 170 rain that is somewhat shorter, fluidity index n is 0. 553, API fluid loss is 90.0 mL, free liquid content is only 0. 1 mL, and 24 h compression strength is 15.08 MPa, showing that this cement slurry system can satisfy the requirement for cementing low pressure, easily leaky and under -balanced wells.
出处
《精细石油化工进展》
CAS
2011年第12期19-21,共3页
Advances in Fine Petrochemicals
关键词
低密度水泥浆
漂珠
微硅
固井
low density cement slurry
floating potential
microsilica
well cementation
