新型无机盐加重超高密度水泥浆体系室内试验

Lab Tests on a New Ultra-High Density Cement Slurry System Weighted with Inorganic Salt

针对超高密度水泥浆存在的诸多问题,采用无机盐FX-1提高水泥浆基液的密度,并合理优化固体加重剂铁矿粉的粒径,配制出了密度为2.87 kg/L的高密度水泥浆。试验结果表明,采用无机盐FX-1可将基液密度提高至1.50 kg/L,结合适宜粒径的铁矿粉,可配制出密度为2.87 kg/L的超高密度水泥浆。该水泥浆具有较好的沉降稳定性和流变性,API失水量小、稠化时间可调、抗压强度高,其综合性能可满足异常高压油气井的固井要求,具有较高的现场应用价值。

In order to solve problems arising from high density cement slurry,a 2.87 kg/L high density cement slurry was developed using inorganic salt FX-1 with optimized hematite particle sizes.Experimental results show that the slurry density can reach 1.5 kg/L using inorganic salts FX-1,and the density can be 2.87 kg/L with suitable particle size of hematite.The system has good stability and rheological characteristic,lower API fluid loss,adjustable thickening time and high compressive strength.Its overall performance can meet the requirements of abnormal high pressure oil and gas well cementing and it has a strong application value in field.