APPLICATION OF PUMPABLE MICRO-FOAMED DRILLING FLUID IN MA703 WELL OF TUHA OILFIELD

At the present time, pumpable micro-foamed drillingmud is the new technology at home and abroad for the low pressure fissure reservoir, viscous crude reservoir, low pressure and permeability reservoir, and the reservoirs leaking easily.In order to exploit low pressure reservoirs with low permeability in the Tuha oil-field efficiently, the pum pablemicro-foamed drilling mud system is developed based on large quantities of lab tests.Suitable foaming agent and stabilizing agent are optimized form icro-foam drilling fluid special in this area.In-house formulation study and other correlated evaluations about properties are also carried out. The successful treatment in well Ma 703 shows that this micro-foam drilling fluid has many advantages, such as low density and pum pable, resisting high temperature and oil contamination, easy control of mud density etc.In a word, it has stable properties and good performance.It can prevent the leakage efficiently in order to protect the formation, also it can short the drilling cycles and drill safely under the approximate balanced condition.