Technical Research On Clay Free Drilling Fluid Of Putaohua Oil Layer

Daqing oilfield petroleum reserves are very abundant, it is the gravity core of china petroleum strategy sustainable development.The Putaohua petroleum reservoir is the substantial of Daqing oilfield sustainable development . It is an important work of the effective protection for the reservoir, advisable development and the antipollution for the external . The clay free drilling fluid is adapt to the demand for recent period well drilling technology development , it is formed on the basis of low solid mud .This system have no clay at first , we merely accede to the macromoleclar polymer and homologous treating chemical , and then the drilling fluid which meet the demand of well drilling is made up . Overseas the clay free drilling fluid is used very early . It is mainly served as completion fluid after breaking reservoir . Because of the low solid , it can prevent the solid from intruding into the producing formation and blocking up the air space , so it has preferable effect for the reservoir production .The research of this article evolves the research on formula of the clay free drilling fluid by the analysis for the advanced technology of clay free drilling fluid home and abroad, and by evaluating for the performance of clay free drilling fluid and improving and consummating the system to make the clay free drilling fluid technology on the base of sufficient master for the geological structure and the hole geometry of Putaohua reservoir .The research of this theme conduces to the protection of Putaohua reservoir . It lays a foundation for the further development of horizontal well , increasing the individual well producing rate and enhanced oil recovery .