Technical Research on Deepwater Water-based Drilling Fluid

Deepwater drilling fluid technology is one of the key technologies of deepwater drilling,the main problems of deepwater drilling fluid are low temperature rheological property and gas hyrate.In order to slove the technical problems,a deepwater water-based drilling fluid formulation was optimized by laboratory experiment.The testing was performed by using viscometer capable of measuring optimized deepwater water-based drilling fluid rheological properties at the temperature of 0,4,10,15,20℃ encounted in deepwater operations.The inhibiting gas hydrate formation ability of optimized deepwater water-based drilling fluid was performed at the pressure of 20MPa and the temperature of 0℃ by DSC(Differential Scanning Calorimetry) technique.The results show that low temperature rheological property,the inhibition gas hydrate formationin ability,temperature-resistant capability,anti-pollution ability,inhibitory property and reservoir protection ability of optimized deepwater water-based drilling fluid are excellent.It could be used for deepwater drilling.