The successful reconnection practice of underwater wellhead in single well dynamic string operation under the full underwater development mode
Since the 1960s,China has been using deep-water underwater oil and gas production trees for underwater oil and gas field development,which involves complex and costly underwater operations.In the process of using dynamic positioning or semi submersible anchoring drilling platforms for well completion or repair operations,in order to meet the well control requirements of the riser section,the underwater Christmas tree system special equipment assembly THRT(Tubing Hanger Running Tool)needs to be connected to the underwater Christmas tree oil pipe hanger and special tool assembly,and carry out construction operations such as recovering the plug assembly and lowering the underwater oil pipe hanger special isolation sleeve assembly.During the reconnection process,it is easy to cause damage to the electro-hydraulic wet joint,resulting in reconnection failure and complex underground situations.This article focuses on the implementation of a series of wellbore cleaning or downhole measures to effectively avoid complex downhole situations,improve the success rate of THRT and TH reconnection,protect underwater and surface equipment,and successfully complete target well operations.In a certain sea area in the eastern South China Sea,multiple well operations have been successfully implemented,forming a certain scale effect.
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