Study of Drilling Fluid for Horizontal Well in Oil Field EP24-2

In order to meet the requirements for drilling engineering and reservoir protection in horizontal well of oil field EP24-2,a solid-free rapid weak gelling drilling fluid was developed by experiment.The drilling fluid has high yield point to plastic viscosity and high low-shear rate viscosity(LSRV),and can be used to solve the problems of carrying cutting and cutting bed in horizontal well.The lab evaluation tests indicated that the drilling fluid has excellent inhibiting ability and lubricity,less filter loss,with capability to resist temperature and pollution,being capable of borehole cleaning and reservoir protection.In view of the technology of open hole completion in horizontal well of oil field EP24-2,study has been conducted on the gel breaking capability of gel breaker JPC to drilling fluid and its filter cake.The results indicated that gel breaker JPC could degrade effectively polymers and avoid reservoir pollution by polymers.The results showed that the drilling fluid had unique rheology,and its maintenance is simple.In addition,it had excellent capability for reservoir protection,being degradable,suitable for drilling the horizontal sections in horizontal well of the oil field EP24-2.