The Development And Application Of Non-solid Drilling Fluid System For Deep Well Exploitation In Liaoheburied Hill Reservoir

Fractured extension,deep burial depth,extremely high temperature and reservoir protection are main obstacles for Liaoheburied hill reservoir exploitation.In our study,to fulfill the requirements of Liaoheburied hill reservoir exploitation,we developed a non-solid drilling fluid system for deep well exploitation which has the heat resistance of 180?,It is consistent with our expectations.The system has been successfully applied to the manufacture field.To determine the core components of non-solid drilling fluid system,basedon the widely investigatedgeological exploration data of Liaoheburied hill reservoir and research references of non-solid drilling fluid system all over the world,we optimized the system through adjusting the ratio of functional agents,selecting temperature resistancetackifier and filtrate produced both in China and abroad.Laboratory data demonstratedthat our developed system achievedfavorable the capacity of higher temperature tolerance,betterinhibition,lubricationand reservoir protection.To determine the effect of our system in filed,nine independentexperiments were performed in 9 different wells.The depth of every well was more than 4000m and the temperature was more than 160?.All the tests were completedwell by our developed non-solid drilling fluid system for deep well exploitation.Filed experiment indicated that our developed non-solid drilling fluid system for deep well exploitation could remain fine stability to avoid the lost circulation,well fall and wells flow effectively.Moreover,thedrilling fluid system showed better capability of protection of oil reservoir,facilitating the discovery and protection of the gas reservoir,coinciding with the exploitationneeds of Liaoheburied hill reservoir.