Drill collar vs drill pipe: the key differences are construction and function. Drill pipe forms the long connection between the surface equipment and the bottom hole assembly (BHA). Drill collars concentrate weight and stiffness within the BHA. However, both components transmit torque, carry axial loads and provide an internal passage for drilling fluid. [1],[2] This …
Matrix acidizing is a stimulation treatment that places a reactive acid system into reservoir pore space while keeping injection conditions below the relevant formation-fracturing limit. Its purpose depends on the rock and the restriction. In sandstone, the target is commonly susceptible material impairing near-wellbore flow. In contrast, dissolution in carbonate rock can create channels that …
Formation damage is a reduction in the ability of reservoir rock near a well to transmit the fluid being produced or injected. It can result from blocked pore throats, changes in sensitive minerals, or changes in fluid saturation and relative permeability. Consequently, a damaged interval may need more pressure difference to deliver the same flow …
What Is Pipe Handling Equipment? Pipe handling equipment is the group of tools and machines used to transfer, lift, support, guide, connect and rack jointed tubulars on a drilling rig. The group includes transfer equipment between the pipe racks and drill floor. Other tools handle tubulars at well center and in the setback area. The …
What Is Well Integrity? Well integrity is the condition in which a well contains its fluids and prevents unintended movement into other formations or the surface environment. Managing it means designing, verifying, monitoring and maintaining the barriers, equipment and working practices needed to preserve that containment throughout the well’s life. [1] A well integrity assessment …
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 …