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- Pore_pressure_gradient abstract "Pore pressure gradient is a dimensional petrophysical term used by drilling engineers and mud engineers during the design of drilling programs for drilling (constructing) oil and gas wells into the earth. It is the pressure gradient inside the pore space of the rock column from the surface of the ground down to total depth (TD), as compared to the pressure gradient of seawater in deep water.Whereas in "pure math," the gradient of a scalar function expressed by the math notation grad(f) may not have physical units associated with it; in drilling engineering the pore pressure gradient is usually expressed in API-type International Association of Drilling Contractors (IADC) physical units of measurement, namely "psi per foot." In the well-known formulaP = 0.052 * mud weight * total vertical depthtaught in almost all petroleum engineering courses worldwide, the mud weight (MW) is expressed in pounds per U.S. gallon, and the total vertical depth (TVD) is expressed in feet, and 0.052 is a commonly used conversion constant that can be derived by dimensional analysis:It would be more accurate to divide a value in lb/gal by 19.25 than to multiply that value by 0.052. The magnitude of the error caused by multiplying by 0.052 is approximately 0.1%. Example: For a column of fresh water of 8.33 pounds per gallon (lb/U.S. gal) standing still hydrostatically in a 21,000 feet vertical cased wellbore from top to bottom (vertical hole), the pressure gradient would begrad(P) = pressure gradient = 8.33 / 19.25 = 0.43273 psi/ftand the hydrostatic bottom hole pressure (BHP) is thenBHP = grad(P) * TVD = 21,000 * 0.43273 = 9,087 psiHowever, the formation fluid pressure (pore pressure) is usually much greater than a column of fresh water, and can be as much as 19 lb/U.S. gal (e.g., in Iran). For an onshore vertical wellbore with an exposed open hole interval at 21,000 feet with a pore pressure gradient of 19 lb/U.S. gal, the BHP would beBHP = pore pres grad * TVD = 21,000 * 19 / 19.25 = 20,727 psiThe calculation of a bottom hole pressure and the pressure induced by a static column of fluid are the most important and basic calculations in all well control courses taught worldwide for the prevention of oil and gas well blowouts.".
- Pore_pressure_gradient wikiPageID "25684865".
- Pore_pressure_gradient wikiPageRevisionID "579483758".
- Pore_pressure_gradient hasPhotoCollection Pore_pressure_gradient.
- Pore_pressure_gradient orphan "January 2011".
- Pore_pressure_gradient unreferenced "February 2010".
- Pore_pressure_gradient subject Category:Applied_and_interdisciplinary_physics.
- Pore_pressure_gradient subject Category:Geophysics.
- Pore_pressure_gradient comment "Pore pressure gradient is a dimensional petrophysical term used by drilling engineers and mud engineers during the design of drilling programs for drilling (constructing) oil and gas wells into the earth.".
- Pore_pressure_gradient label "Pore pressure gradient".
- Pore_pressure_gradient sameAs m.09v5tgp.
- Pore_pressure_gradient sameAs Q7230050.
- Pore_pressure_gradient sameAs Q7230050.
- Pore_pressure_gradient wasDerivedFrom Pore_pressure_gradient?oldid=579483758.
- Pore_pressure_gradient isPrimaryTopicOf Pore_pressure_gradient.