What is a wet shoe cementing?
A “Wet” shoe track is defined as the occurrence of unset, contaminated or no cement in the casing section between float collar and shoe after a primary cement job. Wet shoe tracks are a common occurrence in oilwell cementing and many hours of lost rig time can be attributed to the problem.
What is the purpose of a casing shoe?
A short, heavy cylindrical section of steel, filled with cement, which is placed at the end (bottom) of the casing string. It prevents the casing from snagging on irregularities in the borehole as it is lowered.
What is a cement squeeze?
1. n. [Well Completions] A remedial cementing operation designed to force cement into leak paths in wellbore tubulars. The required squeeze pressure is achieved by carefully controlling pump pressure.
What is a Bradenhead squeeze?
The process by which hydraulic pressure is applied to a casing, workstring, or tubing, to force fluids, such as cement, outside the wellbore. Annular returns may be prevented by closing the casinghead valves. A packer is not run in the well.
What is shoe track in drilling?
Shoe track is a space between casing or liner shoe and the uppermost collar, which keeps contaminated cement after cementing operation has been performed. This term is also used to describe the whole downhole cementing configuration, which consists of wiper plugs, collar or collars, cement and a shoe.
How does a float collar work?
Float collars are placed one to three joints above the guide shoe or float shoe. They provide a seat for the cement plugs, the bottom plug pumped ahead of the cement and the top plug behind the full volume of slurry. Once seated, the top plug shuts off fluid flow and prevents over-displacement of the cement.
What does a casing shoe look like?
In oil drilling and borehole mining, a casing shoe or guide shoe is a bull-nose shaped device which is attached to the bottom of the casing string. A casing hanger, which allows the casing to be suspended from the wellhead, is attached to the top of the casing.
What is a casing head spool?
Casing head is the connection between the blowout preventer stack or casing spool and the casing. It is the lowest part of the wellhead which is almost always connected to the surface casing string. It provides a means of suspending and packing off the next casing string.
What is a cement retainer?
1. n. [Well Completions] An isolation tool set in the casing or liner that enables treatments to be applied to a lower interval while providing isolation from the annulus above. Cement retainers are typically used in cement squeeze or similar remedial treatments.
What is hesitation squeeze?
1. n. [Well Workover and Intervention] A technique used in squeeze cementing whereby a portion of the slurry is pumped, then pumping stops to expose the slurry to differential pressure against the zone of interest in stages over a period from several minutes to several hours.
What is float collar?
A float collar is a part near the bottom of the casing string which catches the bottom plug and top plug, and which prevents mud from entering the casing.
What is casing shoe in oil and gas?
What is the difference between landing collar and float collar?
The landing collar can also be equipped with a ball seat, pinned to shear at approximately 1000 psi above the pressure required to set the liner hanger. The float equipment prevents the uncured cement in the annulus from flowing back into the liner.
What is a flotation collar?
The Flotation Collar is a buoyancy aid designed to capture and tighten around a casualty. It can also be used to lift a human or animal up to a height, while providing a cushioned hold.
What is the shoe in drilling?
What is drilling spool?
Drilling Spools are Pressure-Containing equipment with end connections and outlets, stack in between drill through equipment. Drilling spools are designed to connect the BOP and wellhead, both side outlets of spool can be connected with valves or manifold to prevent blowout.
What is a wellhead in drilling?
1. n. [Drilling] The system of spools, valves and assorted adapters that provide pressure control of a production well.
What is a cement stinger?
Cement retainers are typically used in cement squeeze or similar remedial treatments. A specially profiled probe, known as a stinger, is attached to the bottom of the tubing string to engage in the retainer during operation.
What is the difference between cement retainer and bridge plug?
The difference between each tool is that the TAM Cement Retainer allows the operator to cement through the tool, and the TAMPLUG is strictly a bridge plug.