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Blind Shear Ram Blowout Preventers: Estimation of Shear Force and Optimization of Ram Geometry

Tekin, Abdulkadir
http://rave.ohiolink.edu/etdc/view?acc_num=osu1291178357

Abstract Details

2010, Master of Science, Ohio State University, Mechanical Engineering.
The explosion of the Deepwater Horizon oil rig in the Gulf of Mexico showed once again that during the oil drilling operation any failures of surface equipment which is called blowout preventers (BOPs) may result in death, injury and massive oil spills that have huge impact on the environment. The blowout preventers are devices that are supposed to close off the wellbore and seal it in an emergency to prevent formation fluid from reaching the surface of the well. In a blowout preventer stack, which consists of several types of blowout preventers, the last line of defense is the blind shear ram that is supposed to close and seal the wellbore by shearing through the drill string or any other tubing when they are in the wellbore. According to a recent report prepared for the U.S. Minerals Management Services (MMS) by [Childs et al., 2004], two of the three BOP manufacturers rely on a very basic equation “the Distortion Energy Theory shear equation” to estimate the shear force requirement for shearing operation. However with recent advancement in drill pipe materials, it might not be sufficient to estimate the actual shear force to shear a specific drill pipe using yield or tensile stress by itself and the Distortion Energy Theory shear equation. Using finite element method to analyze the drill pipe materials and dimensions and simulate the entire shearing and sealing operation with blowout preventer working conditions through the finite element method can provide good approximation for actual shear force and sealing pressure to secure the well. Also, the finite element method could be used to optimize shear ram geometry so that minimum force and energy are used to shear the tube by plastic deformation. Fourteen task studies are presented throughout this research. The first two tasks were studied to develop a methodology to evaluate the required shear force to shear a certain drill pipe without considering blowout preventer working conditions effect on shearing operation. The results of these studies were compared with actual shear forces that were obtained from BOP manufacturers [Childs et al., 2004]. The next three tasks were studied to determine a relation between drill pipe diameters and shear force requirement for shearing operations. Tasks 6 to 9 were studied to evaluate the effect of the vertical load that stems from the weight of drill string on shear force requirement. The last five tasks were studied to optimize tool clearance to minimize the actual shear force. It is shown that evaluated shear force evaluated by using finite element method (FEM-Deform 3D) simulations gave fairly accurate results for actual shear force. Also, it is found that by using FEM simulation the effect of the blowout preventer working condition on shearing operation can be estimated and ram geometries can be optimized. Therefore, FEM simulation can be used to design more reliable and efficient ram type blowout preventers.
Taylan Altan (Advisor)
Gary Kinzel (Committee Member)
80 p.
Mechanical Engineering
Blind Shear Ram; Shear Force; Blowout Preventers; Blowout; Shear Ram Geometry; Finite Element Method Simulation;

Recommended Citations

Citations

  • Tekin, A. (2010). Blind Shear Ram Blowout Preventers: Estimation of Shear Force and Optimization of Ram Geometry [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291178357

    APA Style (7th edition)

  • Tekin, Abdulkadir. Blind Shear Ram Blowout Preventers: Estimation of Shear Force and Optimization of Ram Geometry. 2010. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1291178357.

    MLA Style (8th edition)

  • Tekin, Abdulkadir. "Blind Shear Ram Blowout Preventers: Estimation of Shear Force and Optimization of Ram Geometry." Master's thesis, Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291178357

    Chicago Manual of Style (17th edition)

osu1291178357
10,006
© 2010, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.