Window sidetracking technology of C25-XX horizontal well in Zhaodong C/D Block
The horizontal section of well D67 in Zhaodong C/D Block is produced uniformly in the whole screen section.The well is closed because of sand.Therefore,sidetracking is employed in the hole of the C25-XX horizontal well to continue the development of the Minghuazhen reservoir.In this study,window sidetracking technology is introduced in 244.5 mm casing.During construction,rotary geo-steering technology is used to avoid the risk of slide drilling,improving penetration rate.LWD/MWD technology and Azitrack reservoir geo-steering system are employed to control the wellbore trajectory and to improve the drilling footage and target-entry accuracy of the well.XPS-CUS-HR-X1 hydraulic rotating liner hanger&packer system is used to solve the problems of large friction in long horizontal sections and running casing.The well was drilled on October 11 and completed on October 20.The depth of the well is 2 635 m,and the drilling footage of the reservoir is 2%higher than the design.Experiences from the successful construction of this well can be a reference for similar situations.
Zhaodong C/D Blockdrilling technologyhorizontal well
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