Coiled tubing fatigue is the progressive damage caused by repeated loading of the tubing. During normal deployment, the reel and guide arch repeatedly bend and straighten the tube beyond its elastic range. Internal pressure, tubing geometry and the history of each section influence how quickly that damage develops [1, 2]. Consequently, two strings with the …
Coiled tubing sand cleanout removes accumulated fill by loosening it, entraining it in a circulating fluid and carrying it through the return path to surface. In addition, a successful treatment needs enough transport capacity throughout the well, a fluid compatible with the completion and formation, and operating pressures that preserve the planned circulation system. However, …
Tubing movement calculations estimate how much a completion string changes its end-to-end length when pressure, temperature or mechanical loading changes. For tubing that can slide through a packer seal bore, the result helps determine the required movement range. For anchored tubing, the same imposed changes can generate additional tubing and packer loads. Establishing the actual …
Mechanical specific energy (MSE) is the mechanical work used to drill a unit volume of rock. It combines weight on bit, torque, rotary speed, bit area and rate of penetration into one measure of rock-cutting performance. In field units, MSE is normally expressed in psi. Its most useful application is tracking how drilling efficiency changes …
Well blowout is an uncontrolled release of flowing fluids (e.g., gas, oil, water, and mud) from a well once pressure control systems such as BOP Stack are completely lost. This uncontrolled flow will end up with a well kick that increases in severity and may result in a “blowout”. The well control can only be recovered …
The Jar Intensifier is perhaps one of the most outstanding devices designed to help fishermen successfully complete difficult fishing jobs in the oil and gas field. The tool is designed to become a fishing string component and work in conjunction with a hydraulic jar to ensure that the jarring blows are concentrated at the stuck …
A landing nipple is a completion-tubing component with a machined locking profile and sealbore for a compatible lock mandrel and downhole device. Selective systems allow a chosen landing location; no-go systems use a locating shoulder. The nipple provides the receptacle, but the installed plug, valve or instrument assembly determines the function. This guide explains landing-nipple …
Check(s): Comments: BOP Control Unit pressures & leaks: Check pressures of accumulator (3000 PSI), manifold (1500 PSI) and annular (between 700 and 1500PSI subject to ‘requirements’). Check air pressure to air pumps (125 PSI). Look and listen for any leaks of air or oil. Remove the two inspection caps from the reservoir and look along …
The impression still exists that snubbing or hydraulic workover units are exclusively used on blowouts or otherwise uncontrollable wells, which is false. The running of tubulars under pressure has indeed made it possible to bring many wells under control at a considerable saving to the industry, but the ability to perform many routine workovers- and …
The casing pipe is mandatory in drilling operations as it has a lot of casing functions to prevent cave-in of unconsolidated formations, isolate problem zones, and many more. As mentioned before in our casing design guide, the selection of casing depends on many factors. Here in this article, we shall learn everything about the best …