Research and Application of High Calcium Base Drilling Fluid Technology in the Junggar Basin
The upper formation of the oil field in the eastern the Junggar Basin is developed with gypsum mudstone,which is prone to hydration dispersion,wellbore instability,calcium ion pollution of the drilling fluid system,and difficult to control rheology and fluid loss reduction,seriously restricting the exploration and development process of the eastern oil field.In order to solve the problem of drilling fluid pollution and instability of inhibition in the eastern oil field of the Junggar Basin,a high calcium based water-based drilling fluid system with strong calcium resistance and stable performance was constructed with anti calcium fluid loss additive as the core,and its temperature resistance,inhibition and pollution resistance were evaluated in laboratory.The on-site test results show that the high calcium based drilling fluid system exhibits good filtration loss reduction ability,rheological properties,and pollution resistance in both saline and salt gypsum layers,with a complex time rate of 0.This provides technical support for ensuring safe and rapid drilling in the upper strata of the eastern oilfield.
gypsum mudstonewellbore instabilityanti calcium and filter loss agentshigh calcium based drilling fluidThe Junggar Basin
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