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well pad

A temporary drilling site. Well pads can contain one well or many wells. (Adapted from: Schlumberger 2019)

well stimulation

A treatment performed to restore or enhance the productivity of a well. Stimulation treatments fall into two main groups, hydraulic fracturing treatments (See Hydraulic fracturing) and matrix treatments (e.g., acid or solvent and chemical treatments to improve the permeability of the near-wellbore formation). Fracturing treatments are performed above the fracture pressure of the reservoir formation and create a highly conductive flow path between the reservoir and the wellbore. Matrix treatments are performed below the reservoir fracture pressure and generally are designed to restore the natural permeability of the reservoir following damage to the near-wellbore area. Stimulation in shale gas reservoirs typically takes the form of hydraulic fracturing treatments. (Source: Schlumberger 2019)


There is no consensus on a single definition of well-being, but there is general agreement that at a minimum, well-being includes the presence of positive emotions and moods (e.g., contentment or happiness), the absence of negative emotions (e.g., depression or anxiety), satisfaction with life, fulfillment, and positive functioning. In simple terms, well-being can be described as judging life positively and feeling good. For public health purposes, physical well-being (e.g., feeling very healthy and full of energy) is also viewed as critical to overall well-being. (Source: Centers for Disease Control and Prevention 2013)


A borehole; the hole drilled by the bit. (Adapted from: Schlumberger 2019)


The system of spools, valves, and assorted adapters that provide pressure control of a production well. (Source: Schlumberger 2019)