Jun 1, 1992 · This paper describes the influence of reservoir compaction and surface subsidence on well casing damage, including compression, buckling, shear, and bending failure mechanisms. Casing damage from shear stresses within the overburden is identified as a primary failure mode for many reservoir conditions.

A well can allow oxygen into the soil where it will thin out any organic materials present, possibly causing subsidence. Without redigging the well using expensive methods it is hard to prevent this. Also, if the water is in a reservoir of some kind, reduction of that reservoir can cause subsidence.

Mar 2, 2019 · Land subsidence is a gradual settling or sudden sinking of the Earth’s surface owing to subsurface movement of earth materials. The principal causes of land subsidence are aquifer-system compaction, drainage of organic soils, underground mining, hydrocompaction, natural compaction, sinkholes, and thawing permafrost. Land...

Methods to control or arrest subsidence include reduction of pumping draft, artificial recharge of aquifers from the land surface, and repressuring of aquifers through wells, or any combination of these methods.

In view of the ever-increasing global energy demands and the imperative for sustainability in extraction methods, this article surveys subsidence monitoring systems applied to oil and gas fields located in offshore areas.

Land subsidence has been documented to occur during some deep oil and gas reservoir pumping and during groundwater extraction. Let us compare anthropogenic land subsidence over gas/oil fields to that occurring over multi‑aquifer systems.

Groundwater-related subsidence is the subsidence (or the sinking) of land resulting from unsustainable groundwater extraction. It is a growing problem in the developing world as cities increase in population and water use, without adequate pumping regulation and enforcement.

Dec 31, 1995 · Withdrawal of fluids from shallow, thick and low strength rock can cause substantial reservoir compaction leading to surface subsidence and well failure. This is the case for the Diatomite reservoir, where over 10 ft of subsidence have occurred in some areas.

Subsidence causes damage impairing the function of some surface facilities. It can create low points in pipelines and alter the alignment of microwave transmission stations. A more-subtle consequence of subsidence is ground lowering that makes more land subject to flooding.

A new wellhead assembly and method for restoring casing string tension provides a fast, economical solution to well problems created by ground subsidence.