摘要
用硅灰作高温稳定剂，漂珠为减轻剂，与Ｇ级油井水泥配制密度为１５ｇ／ｃｍ３的水泥浆。该水泥浆的特点是：①密度低，用水量小；②在低温下强度高、滤失量低、析水为零、稠化时间可调、流变性好，能满足施工工艺的要求；③水泥石能承受高温，在３５０℃、２０ＭＰａ下养护３天，强度达１２ＭＰａ。该低密度水泥浆可用于低压易漏地层稠油热采井的固井，并可大大减轻因高温引起的水泥石强度衰退，延长油井的寿命。
A cement slurry, whose density was 1.5 g/cm3, had been prepared using class-G oil-well cement with silica fume as a thermostabilizer and microsphere as light-weight admixture. After curing at 45℃and atmospheric pressure for 48 hours, the cement slurry displayed a compressive strength of 15 MPa; the water loss ( at 7 MPa for 30 min. ) was less then 250 ml and no free water was observed. After curing at 350℃ and 20 MPa for 3 days, the cement slurry had a compressive strength of more than 10 MPa. Such a temperature-resistant, lightweight cement slurry can be used for well cementing in low-pressure, viscous oil reservoirs planned for thermal recovery to considerably reduce the high temperature-induced strength decline of the cement and prolong the life span of the producing well.
出处
《西南石油学院学报》
CSCD
1997年第2期68-72,共5页
Journal of Southwest Petroleum Institute
关键词
稠油开采
水泥浆
热稳定性
固井
Viscous oil recovery
Thermal recovery
Lightweight mud
Thermal stability
Well cementing
