The Design And Application Of High Temperature Resistance Flushing Spacer Liquid For Oil Base Drilling Fluid

Use clean water to do the main raw materials water-based drilling fluid rinses is alwaysthe first choice of domestic oil well cementing. Rinse water base isolation of water-basedfluid drilling mud with a very good flush isolation efficiency, when the well use oil-basedrilling fluid, there will be apparent on the casing and mud cake between borehole wallproduce, leading to the first interface and the cementing quality of the secondary interfaceperformance is reduced, ordinary drilling fluid can't flush water base isolation reached flushisolation effect, this kind of condition of the occurrence of oilfield development andexploration of cementing operation is great harm. So, design and use a kind of good oil-basemud flush isolation liquid will well cementing wall before the attachment oil-base paste isrinsed clean,cementing is the key factor to success.For this thoroughly carry out the interior research, in contrast analysis of the domesticexisting flush isolation performance liquid based on the experimental method and a new typeof high temperature resisting oil-base drilling fluid flush isolation fluid system composed ofadditives, determined the system formula. The new system for oil-base drilling fluid with astrong broken breast ability, flushing efficiency and oil-base drilling fluid and mud cake canachieve a thorough washing result; And oil-in-water emulsions drilling fluid and slurrysystem has good compatibility are and suspension stability, no thickening, flocculation, suchas precipitation phenomenon production. Rinse isolation fluid system has good performanceof temperature, formed150℃high temperature stability of the suspension system.