Drilling fluid technology for horizontal well casing running in deep water shallow soft strata of South China Sea gas hydrates
Taking the construction project of a high-building rate horizontal well in a certain sea area of the South China Sea as an example,this paper introduces the casing running method for high-building rate horizontal wells in deep water shallow soft strata,as well as the optimization plan for drilling fluid technology during the casing running.It is the first time that a casing running without a riser has been successfully applied in a deep water shallow horizontal well.For casing running in deep water without a riser,plastic bending is most likely to occur when the casing is delivered near the wellhead.The wellbore quality and the lubrication performance of the drilling fluid are the key to successful casing running.Engineering practice has shown that the low-temperature dual-inhibition drilling fluid system is applicable for drilling and completion of the well.It has good performance in various aspects such as wellbore cleaning,wellbore stability,lubricity,and prevention of formation and decomposition of hydrate.Compared to conventional wells,special attention should be paid to drag reduction measures for the"iron-iron"hard friction between the upper casing when running casing in deep water shallow high-building rate horizontal wells.Practice has shown that solid lubricants have much better effects than liquid lubricants.
deep water shallow soft stratahigh-building rate horizontal wellsdrilling without riserdrilling fluidsmarine natural gas hydrates
NETL
NSTL
万方数据
