Steel pipe that is run in the hole after drilling, it is cemented in place to support the hole and isolates the annular space from the inner space.
Steel pipe of small diameter that is used for intervention, i.e. conveying tools or circulating fluid into a well. The pipe is coiled onto a reel and run in the hole with a hydraulic injector.
All hardware run and operation performed after the well is drilled, cased and cemented. Completion is often referred to as bottom hole completion for the aspects dealing with the connection between the well and the reservoir (open-hole, perforations, sand screen, etc.) and upper completion for the system the safely conveys the fluids between the bottom and the surface (pumps, tubings, packers, etc.)
Impairment to flow generally creating a pressure drop next to the wellbore thus reducing the productivity or injectivity. Damages include scaling, solid invasion, mechanical impairment, emulsions, etc.
Dogleg refers to the curvature of the well trajectory: the higher the dogleg severity, the sharper the turn or the shorter the curvature radius.
Hardware equipment composed of a steel mandrel mounted with elastomeric sealing elements (packings). A packer seals the annular space around a piece of pipe such as a tubing.
Often used for fluid injection, placement refers to defining an accurate spot where the treating fluid is to be injected.
In well intervention, plugging often refers to injecting a very viscous fluid (polymer) or particulate material (solids, cement) or any fluid that will create enough damage into or in front or a permeable rock formation to eliminate further leaking into or inflow from that formation. A plugged formation is sealed from the wellbore.
Rock mass with some ability to hold and circulate fluid (porosity, permeability, transmissibility) used for injection or production. A well normally connects the surface to a reservoir.
Ability of a completion to produce or inject from and into specific locations. This feature is desirable when a single well penetrates multiple targets that need to be accessed independently.
Technique used to enhance the productivity or injectivity of a well. Most common stimulation techniques include hydraulic fracturing and matrix acidizing.
Hydraulic or electric device used in highly deviated wellbores to pull either cables of coiled tubings when gravity is insufficient the tractors runs them to bottom.
Any service performed in a well for a specific purpose. Treatments include stimulation, perforation with explosive, remedial work of all sorts.
Steel pipe conveying production or injection fluids between the reservoir and the surface. Many geothermal wells do not have tubings and use the full diameter of the casing for that purpose.
Light rig with limited drilling capabilities usually used to run tubings and perform any kind of well completion or intervention.