低温对水泥浆流变性影响规律分析

The Analysis of Slurry's Rheology in Low Temperature

针对海洋深水固井的特点(低温、浅层流、压力安全值低),提高固井顶替效率,目前已有许多行之有效的理论和施工措施,但这些理论和措施不一定适合深水固井所面对的地层松软、浅层流的特点,这就对前置液和水泥浆的流变性能提出了更高的要求。深水固井过程与常规固井过程中流体遇到的温度影响有较大不同。泥浆与水泥浆均属非牛顿液体,它们的流变特性与注水泥工作有着密切的关系,准确地掌握它们的流变规律便能帮助我们正确地调节泥浆、水泥浆的流变性能,正确地确定顶替流态,并能准确地计算注水泥过程的流动阻力。经研究表明,水泥浆的流变性随温度压力变化十分明显,温度对流动计算结果的影响非常显著。因此,对低温条件下水泥将流变能的研究具有非常重要的现实意义。

Depending on the characteristics of the deep water cementing(low temperature,shallow flow,low safety pressure),there are many theories and construction measures.However,these are not always suitable for the deep-water cementing real features such as soft formation and shallow flow.Therefore,pre-slurry and slurry should have a better rheology.Deep water cementing has a big difference compared to the normal cementing.For deep water cementing,drilling fluid and slurry belong to non-Newtonian fluids and their rheology has a close relationship with cementing.A good master of them will help us to adjust the drilling fluid and slurry's rheological,determine the displacement fluid statement correctly and calculate the fluid resistance of cementing.It has been studied that slurry's rheology has a big variation along with temperature and pressure,and temperature has an apparent influence for flow calculation results.So,there is an immediate significance for the study of slurry's rheology in low temperature.