地质钻探堵漏用盐水水泥浆的实验研究

Experimental study on salt-water cement slurry for plugging in geological drilling

摘要:

在我国青海、新疆等干旱地区，部分矿区现场水为卤水，含盐量较高，水泥堵漏时需要采用盐水配制水泥浆。室内通过对多种水泥外加剂的优选，研制了一套地质钻探堵漏用盐水水泥浆体系，对其常规性能和堵漏性能进行了综合评价。结果表明：该体系具有良好的流动性、降失水性和沉降稳定性；早期抗压、抗折强度更大，终凝时间更短，5%氯化钠对于水泥浆有明显的早强、促凝作用；在30 MPa、45~75 ℃下的稠化时间为110~170 min，浆体稳定，稠化特性良好，可有效封堵1~3 mm的孔板、缝板。盐水水泥浆体系在类似地区的裂缝性地层堵漏作业中将有良好的应用前景。

Abstract:

In Qinghai， Xinjiang and other arid areas of China， some mining site water is brine with high salt content. For convenience， salt water is used to prepare cement plugging slurry. A set of salt-water cement plugging slurry system for geological drilling is developed through the selection of various cement admixtures， and the conventional and plugging properties have been comprehensively evaluated. The results showed good fluidity， filtration reducing property and sedimentary stability， the early compressive and flexural strength of the system is greater， and the final coagulation time is shorter. 5% sodium chloride shows obvious early strength and promoting coagulation for cement slurry. The thickening time of the system at 30MPa and 45~75℃ is 110~170min， the slurry is stable， and the thickening characteristics are good， which can effectively plug up the orifice and seam plate. The saltwater cement slurry system has a good application prospect in the plugging operation of fractured formation in similar areas.