The annular preventer (also called bag type, spherical, or universal preventer) is the most versatile piece of equipment on the BOP stack since it can close around the casing, drill pipe, drill collars, wireline, and even close an open hole. The rubber packing elements of the annular preventers, which allow this flexibility, are also subject …
During well control operations, the maximum allowable borehole fluid pressure at the casing shoe is normally considered to be the critical factor, based on the assumption that the weakest formation is at the shoe. For practical purposes, the corresponding pressure at the surface (Drilling MAASP or Maximum allowable annular surface pressure) is calculated through specific …
Well control operations are performed at reduced pump speeds or slow circulation rate in order to: Operation of the pump at a pressure too close to the setting of its relief valve is dangerous. If the relief valve opens, drilling fluid will flow back through the drill pipe and standpipe manifold. Circulation pressures at the …
In subsea situations, a pressure loss exists when circulating through the choke line due to the friction losses in the extended choke line running up from the BOP. This pressure loss is not accounted for in normal Slow Circulating Rate (SCR) measurements, which are taken while circulating up the marine riser (see Fig 1). In …
Conventionally, one will drill a well and use heavy drilling fluids to control the well pressures and to control the flow of cuttings from the well. Sometimes, using air or gas as the circulating medium or using light mud to drill in an underbalanced condition is beneficial. You must use a rotating drilling head when …
The kick tolerance can be defined as the maximum volume of kick influx that can be safely shut in and circulated out of the well without breaking down the formation at the open hole weak point. Here In this article, we will explain kick tolerance calculations methods, formulas & the most important considerations. Kick tolerance …
The purpose of these BOP & Well Control drills procedures or exercises is to familiarize rig personnel with the various equipment and with the techniques that will be employed in the event of a Well Kick. Here, we explain all well control drills including trip drill procedure, pit drill in drilling, H2S drill, Emergency drills, …
NOV Shaffer Blowout Preventers BOP stack field proved its efficiency in performing good isolation around the drill pipe, across the open hole, and for performing shearing on the drill string. Here you will be able to understand Shaffer BOP ram and annular preventer type components and function. Also, you can download Shaffer BOP manuals & …
The Cameron U II BOP takes all of the features of the U blowout preventer and adapts them for subsea use in the 18-3/4-10,000 and 15,000 psi WP sizes. Like all other Cameron preventers, the preventer rams in the U II BOP are pressure-energized. Wellbore pressure acts on the rams to increase the sealing force …
The Cameron U BOP blowout preventers are the most widely used ram-type BOP for land, platform (platform rigs) and subsea applications worldwide and offers the widest range of sizes of any Cameron ram-type BOP. Like all other Cameron preventers, the rams in the U BOP are pressure-energized. Wellbore pressure acts on the rams to increase …