井身
3.To face the engineering characteristics of gas well drillling in Sichuan Basin,the essen- tial requirements of hole program in this region and the major methods in its design and execution have emphatically been discus- sed in this paper,and the experiences and lessons in this field have been presented as well.
4.A series of measures, including choosing high grade casing of KO-140T×15. 8mm, optimizing casing schematics and cement slurry systems and applying good performance brine cement slurry, enhance the quality of salt-gypsum formation cementing and ensure safety downhole drilling operations.
5.For the following characteristics: relatively rigid stratum, poor drillability, big stratigraphic dip and high geothermal gradient etc, some drilling techniues have been taken,such as,optimizing Casing program,using PDC bit, optimizing drilling tools assmbly and selecting drilling fluid resisting high temperature,so improving drilling rate and well bore quality,and cutting the drilling cost.
6.The advantages of the tools include:strong pendulum force,good inclining-prevention and dropping results,which ensure the wellbore quality and improve ROP.
7.Abstract: According to the problems occurred during the first stage of five well drillings in Qianmiqiao Qianshan Structure,technical measures,such as optimal well configuration,bottom hole assembly,bit type and drilling fluid were taken during the second stage of another five deep drillings and better results were achieved.It is helpful to explore and develop in Qianmiqiao Qianshan Structure in Dagang Oilfield.
8.This article offers a method for solving the frictional drag, that is, according to the various buckled shapes of coiled tubing in different hole sections, working out the mean contact counterforce in a screw pitch in solving the radial contact counterforce.
9.According to the problems occurred during the first stage of five well drillings in Qianmiqiao Qianshan Structure,technical measures,such as optimal well configuration,bottom hole assembly,bit type and drilling fluid were taken during the second stage of another five deep drillings and better results were achieved.It is helpful to explore and develop in Qianmiqiao Qianshan Structure in Dagang Oilfield.
10.And according to the size of the breakdown pressure, in combination with well trajectory string structure and preset pumping program of the ERW, the model of fracturing slurries movement interface in ERW wellbore was defined. Through detecting real-time fracturing slurries interface position and the varying property parameters of every segment fluid in the wellbore and its corresponding changes of rheological parameters, we can calculate the surface treatment pressure which providing a crucial parameter for fracturing design and operating process.
