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- W84886711 abstract "The main tasks for this master thesis were to briefly describe methods and equipment involved in dual gradient drilling and to develop a drilling hydraulics software tool. This report gives a brief overview of the theory and equipment involved to utilize dual gradient drilling, and describes some of the different methods and technologies that can be used to achieve dual gradient drilling. Furthermore a software tool for calculating drilling hydraulics has been created for this task. The software is based on a torque and drag simulator made by the author for the specialization project during the 9th semester. The hydraulics software can be used to calculate drilling hydraulics for a conventional single gradient well, or for a dual gradient drilling system. The latter distinguishes this software from many other commercial available software. In addition, the software includes an application for calculating the optimal combination of return line depth and mudweight for each section, based on pore and fracture pressures. User specific safety margins, riser density and other inputs are also taken into account. The hydraulics calculations are based on two different fluid models, power-law and Herschel-Bulkley. The user decides which one to use. An innovative method of finding rheology parameters from viscometer readings is used. This report describes briefly the development, structure and logic of the created software, and parts of the code especially relevant for dual gradient technology is included in appendix E. An example well has been designed with the intent of comparing the performance of the software to other software. Multiple cases with varying pump rates and penetration rates are used for comparison. The results are satisfactory compared to the other software. In addition, the effect of utilizing dual gradient drilling technology in the example well is compared to conventional drilling, and the results are presented. The example well is a deepwater well with a narrow mud window, and the goal is to reduce the number of casings needed to reach the targeted depth. By utilizing dual gradient technology its possible to reduce the number of intermediate casings from three to two, which would greatly reduce the well cost." @default.
- W84886711 created "2016-06-24" @default.
- W84886711 creator A5079726056 @default.
- W84886711 date "2012-01-01" @default.
- W84886711 modified "2023-09-27" @default.
- W84886711 title "Hydraulic Software for Dual Gradient Drilling" @default.
- W84886711 hasPublicationYear "2012" @default.
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