| In the field of oil and gas information services,the wellsite data is the main source of information for technical decisions in the oil and gas drilling process.How to ensure real-time transmission of the wellsite data in offshore drilling and the real-time monitoring of the entire drilling process is a key link for achieving safe and rapid offshore drilling.This paper first studied the transmission technology of wellsite data,and completed the development of a data transmission interface based on Wellsite Information Transfer Specification(WITS standard)and Wellsite Information Transfer Standard Markup Language(WITSML standard),realized the data connection with service companies and operating companies;Secondly,based on the drilling data transmitted by the wellsite in real time,as well as the designed wellbore trajectory,wellbore structure and other parameters,the drill string stress model was used to analyze the stress changes of the drill string in real time.And according to the variation law of drilling parameters,10 identification models of drilling conditions were established,and drilling efficiency analysis was combined with drilling time-effect model to improve drilling efficiency;Finally,the C#.NET programming language and SQL Server 2008R2 database were used to develop The System of Offshore Oil Drilling Monitoring and Drilling Condition Evaluation.The System of Offshore Oil Drilling Monitoring and Drilling Condition Evaluation developed by this paper was tested and applied in an oil field in Bohai,China.And the application results show that the stress variation law of the drill string is basically consistent with the actual situation,and the error between drilling condition identification and time-effect analysis results and actual data is less than 5%.It effectively improved intelligent drilling operations,reduce the man-made operational accidents,shortened drilling cycle,reduced operating costs,and achieved safe drilling. |
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