Hollow glass beads on drilling fluid density
With the oilfield development, often faced with difficult exploration and development, purpose layer buried depth, low formation pressure, then use under-balanced drilling more. Therefore, more and more high to the requirement of drilling fluid.In order to reduce the leakage and reservoir protection, as well as oil and gas layers in time, need of drilling fluid density is lower than 1.0 g/cm3. With air drilling, foam drilling fluid, and water-in-oil emulsion drilling fluid, the realization of the oil-base drilling fluid is easy way, but there are many shortcomings, and drilling fluid performance itself control difficult, rheology and hydraulics calculation complex practical problems such as difficult to solve. Using high-performance glass beads in under-balanced drilling has many advantages. Adding glass beads of the drilling fluid density decreased significantly, and the added amount, the lower the density of drilling fluid.When the content of T60 type glass beads was 40%, 0.870 g/cm3 density of drilling fluid. Therefore, its biggest advantage is to adjust drilling fluid density within a certain scope. Instant in high pressure high, the drilling fluid density is more stable, this is because the hollow glass beads with low density high strength properties.
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