Core complications			Consequential complications
Pump/Lift failure		→

Corrosion / Erosion

Production drop / shut-in
Metal wearing	Corrosion / Erosion / casing collapse	→	Sustainable Annulus

Pressure

Pressure (SAP)
Packer leak	→	Sustainable Annulus Pressure (SAP)
Valve leak
Sand production

Tubing

		→	Perforations plugging, tubing erosion
Clay production		→	Bottom-hole build-up
Solid depositions	Scale build-up, Asphalten build-up, Gas hydrates build-up

Perforations

	→	Tubing plug-in
Downhole cross-flow	Behind-Casing Cross-Flow / Channeling	→	Thief water/gas production/injection
Well-Reservoir Contact (WRC)	Skin build-up

Some derivative complications:

→	Productivity/Injectivity decrease

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