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Rongsheng Company Successfully Launches Its Self-Developed “Super Shear Ram”
2021-09-25
(Staff correspondents: Li Liye, Song Chuanchuan, and Zhang Wenjing) On September 24, at Rongsheng Company's well control testing site, with a command from the test director, a ZT NC46-65 6 1/2" drill collar with a wall thickness of 47 mm was cleanly sheared as the hydraulic pressure reached 28 MPa. The fracture surface of the drill collar was neat and even, and the cutting edge of the shear ram showed no damage. According to reports, the test used the "Super Shear Ram" independently developed by Rongsheng Company. This super shear ram has outstanding shearing capability and can shear any section of the drill string in emergency situations, greatly improving the shearing capacity and reliability of ram BOPs. Following this, Rongsheng Company' successively completed shearing tests on various drill tool joints and drill collars, all of which were successfully sheared in a single attempt.
The shear ram in a ram BOP is the last line of defense for drilling safety and environmental protection. In the event of a blowout loss of control or a fire, it can shear the drill pipe in the wellbore and shut in the well in time. However, when conventional ram BOPs shear drill pipe, they must avoid special sections of the drill string such as tool joints, which may create a risk of unsuccessful shearing in emergency situations. As domestic drilling continues to move toward deep and ultra-deep wells, the drill strings used by drilling crews are becoming increasingly higher grade, and drilling conditions are becoming more complex. As a result, the development of a "Super Shear Ram" capable of successfully shearing drill tool joints, drill collars, and high-grade drill pipe has become a new requirement for shear rams in the oil and gas industry both in China and abroad.
To address this need, Rongsheng Company, as one of the earliest domestic companies to develop and manufacture shear ram BOPs, carried out research on shear ram materials and feasibility analysis of shear ram structures. Without changing the original BOP height or the inner cavity dimensions of the ram, and by taking into account the structural characteristics of ram BOPs, the company performed numerical shearing simulations on drill strings of different diameters, wall thicknesses, and steel grades, and successfully developed the "Super Shear Ram" with an interlocking structure. This shear ram features a cleverly designed cutting edge with an optimized structure and minimized shearing stress, enabling it to shear any section of the drill string. The successful launch of Rongsheng Company's "Super Shear Ram" will undoubtedly add another strong safeguard to the intrinsic safety of well control.
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