新型抗高温粉煤灰低密度水泥浆  

A New High Temperature Low Density Cement Slurry with Fly Ash

作　　者：徐伟祥[1] 王成文[1] 刘巍 李斐 孟凡昌[1] 

机构地区：[1]中国石油大学(华东)石油工程学院 [2]中石化胜利油田分公司石油工程技术研究院 [3]中石化西北油田分公司工程技术研究院

出　　处：《钻井液与完井液》2015年第4期55-58,108,共4页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金"水热合成型固井材料体系及其高温固化机理研究"(51174226);国家科技重大专项"塔里木盆地大型碳酸盐岩油气田开发示范工程"(2011ZX05049)联合资助

摘　　要：针对目前粉煤灰低密度水泥浆体系高温下沉降稳定性差及顶部水泥石抗压强度发展缓慢等问题,测试了在中高温条件下粉煤灰、微硅类稳定剂加量对水泥石强度的影响,实验发现微硅类稳定剂在高温条件下（≥125℃）会阻止粉煤灰水泥浆抗压强度正常发展。通过研究出一种新型高温增强剂,保证了粉煤灰低密度水泥浆体系的高温稳定性,并解决了目前粉煤灰低密度水泥浆体系存在的高温强度发展异常、强度很低等问题,最后开发出一套密度为1.50~1.60 g/cm3的粉煤灰低密度水泥浆体系。该体系具有沉降稳定性好、API失水量小、稠化时间可调等性能,水泥石抗压强度较高且顶部抗压强度发展良好,130℃下静胶凝强度的过渡时间为18 min,能够满足85~130℃的大温差高温固井。The effect of the concentration of fly ash and micro silicon powder on the compressive strength of set cement at middle and high temperatures was studied. At elevated temperatures(≥125 ℃), micro silicon powder(used as stabilizer in cement slurry) hindered the normal increasing of the compressive strength of the fly ash cement slurry. A new high temperature enhancer was developed for use in low density fly ash cement slurry to maintain its high temperature stability and to solve the abnormal development of the strength of the said cement slurry. Using this enhancer, cement slurries having density of 1.50-1.60 g/cm3 were developed. These slurries had good sedimentation stability, low filter loss, changeable thickening time, high compressive strength of set cement, and good compressive strength development at the top of cement slurry column. The static gel strength of the cement slurry had transition time of 18 min at 130 ℃, satisfying the needs for well cementing at higher differential temperatures, such as 85-130 ℃.

关 键 词：高温固井 大温差 低密度水泥浆 粉煤灰 增强剂 

分 类 号：TE256.6[石油与天然气工程—油气井工程]