Design and Application of Frac-Pack Completion String for Deep-Water Wells

In order to improve the recovery efficiency of deepwater oil and gas fields in China and reduce risk in deep-water completion,we developed and promoted the application of deep-water frac-pack completion.This paper gives a brief introduction of features of the technique and the design principles of the completion string,then presents the optimization of preparation and execution of deep-water completion according to the conditions and characteristics of deep-water wells.A complete set of techniques for lower section completion for deep water wells are formed including optimization of platform layout,completion fluid management,one trip wellbore cleaning,the joint operation of perforation and frac-pack,and precise operation,etc.This technology has been used in 8 wells in the eastern South China Sea deep-water cooperation blocks.With an average operating time of 12.53 d,it reached 100% success ratio in sand control.The data of well test shows that sand content and production of all the wells meets the requirement on commissioning.The technique fills the gap in deep-water well completion in eastern region of the South China Sea.Field application shows that the technique works well in sand control and production improvment,and can improve operation efficiency considerably.It is especially suited for fast and batch completion operations after drilling.