What is the formation pressure?
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What is the formation pressure?
Formation pressure is the pressure acting on the fluids (i.e., formation water, oil, and gas) in the pore space of the formation. Normal formation pressures in any geological setting are equal to the Hydrostatic Head (hydrostatic pressure) of water extending from the surface to the subsurface formation.
How do you calculate initial oil formation volume factor?
Formation volume factor is defined as the ratio of gas volume at reservoir condition to the gas volume at standard condition, that is,(2.45)Bg=VVsc=pscpTTscZZSC=0.0283zTpwhere the unit of formation volume factor is ft3/scf.
How is reservoir pressure calculated?
The reservoir pressure can be determined by measurement using bottomhole pressure gauge, well testing, or graphics. Generally, formation pressure is assessed by the pressure gradient and the pressure coefficient.
How do you calculate formation pressure gradient?
Calculating Pressure Gradient:
- Average SG = SG of water x Water Cut + SG of oil x (1-Water Cut)
- Average Gradient = 0.433 x Average SG.
- Fluid Height = Pressure / Gradient.
What is formation pressure in oil and gas?
Formation pressure is the pressure exerted by the formation fluids, which are the liquids and gases contained in the geologic formations encountered while drilling for oil or gas. It can also be said to be the pressure contained within the pores of the formation or reservoir being drilled.
How do you calculate formation factor?
Unless otherwise stated, the term formation factor usually refers to the apparent formation factor. F has been related to porosity (phi) by several formulae (Archie, Humble and others) that have the general expression F = a / phim, where a is a constant and m the porosity exponent.
How is formation temperature calculated?
Formation temperature = (ambient surface temperature ) + (temperature gradient x Well TVD)
- Formation temperature in F (Fahrenheit)
- ambient surface temperature in F (Fahrenheit)
- temperature gradient in F/ft (Fahrenheit / ft)
- Formation Temperature, °F = 90 °F + (0.015 °F/ft x 12,000 ft)
What is Gor scf bbl?
The proportion between oil and natural gas obtained from a producing well under given conditions of temperature and pressure. Commonly abbreviated GOR and measured in standard cubic feet of gas per barrel of oil (SCF/BBl).
What is formation volume factor?
Oil formation volume factor is defined as the volume of oil (and dissolved gas) at reservoir pressure and temperature required to produce one stock tank barrel of oil at the surface.
What is formation pore pressure?
Formation pore pressure is defined as the pressure exerted by the formation fluids on the walls of the rock pores. As discussed earlier, the pore pressure supports part of the weight of the overburden stress, while the other part is taken by the rock grains (Rabia, 1985).
Is formation pressure the same as pore pressure?
Pore pressure (or formation pressure) is the pressure acting on the fluids in the pore space of a formation. It is equal to the hydrostatic pressure plus the over-(or under) pressure.
What is the formation factor?
(3) Formation factor is the ratio of concrete resistivity to its pore solution resistivity. It is equivalent to the inverse of the product of porosity and pore connectivity, as shown in the equation in Figure 3. The formation factor has a direct relation to concrete’s bulk diffusion coefficient.
