Difference between revisions of "Dictionary:Overburden pressure"

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The stress that results from the weight of overlying materials (overburden). Also called <b>overburden stress</b> and <b>lithostatic pressure</b>. Rock failure prevents formation pressure from exceeding this value; see Figure [[Special:MyLanguage/Dictionary:Fig_P-12|P-12]]. Often specified by a pressure gradient, about 1 psi/ft (2.26&#x00D7;10<sup>4</sup>&#x0020;Pa/m or 20 lb/gallon mud); the value depends on rock density and tends to increase with depth. Overburden pressure gradient is often expressed as EMW, equivalent [[Special:MyLanguage/Dictionary:mud_weight|''mud weight'']] (q.v.).
 
The stress that results from the weight of overlying materials (overburden). Also called <b>overburden stress</b> and <b>lithostatic pressure</b>. Rock failure prevents formation pressure from exceeding this value; see Figure [[Special:MyLanguage/Dictionary:Fig_P-12|P-12]]. Often specified by a pressure gradient, about 1 psi/ft (2.26&#x00D7;10<sup>4</sup>&#x0020;Pa/m or 20 lb/gallon mud); the value depends on rock density and tends to increase with depth. Overburden pressure gradient is often expressed as EMW, equivalent [[Special:MyLanguage/Dictionary:mud_weight|''mud weight'']] (q.v.).
 
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Latest revision as of 11:55, 14 November 2017

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The stress that results from the weight of overlying materials (overburden). Also called overburden stress and lithostatic pressure. Rock failure prevents formation pressure from exceeding this value; see Figure P-12. Often specified by a pressure gradient, about 1 psi/ft (2.26×104 Pa/m or 20 lb/gallon mud); the value depends on rock density and tends to increase with depth. Overburden pressure gradient is often expressed as EMW, equivalent mud weight (q.v.).