Is bottom hole pressure the same as reservoir pressure?
Is bottom hole pressure the same as reservoir pressure?
In a flowing well the bottom hole pressure is equal to the pressure drop in the tubing plus the wellhead pressure. The reservoir or formation pressure at the bottom of the hole is known as bottom hole pressure. Bottom hole pressure is the pressure at the bottom of the hole, usually measured in pounds per square inch.
How do you calculate flowing bottom hole pressure?
The bottom-hole or pump intake pressure can be calculated by the summation of either (1) tubing pressure and the gaseous liquid column pressure inside the tubing or (2) the casing pressure, the annular gas column pressure and the annular gaseous liquid column pressure.
What is the hydrostatic pressure at the bottom hole?
The bottom hole pressure (BHP) is equal to the hydrostatic pressure (HP) on the annular side. If shut in on a kick, bottom hole pressure is equal to the hydrostatic pressure in the annulus plus the casing (wellhead or surface pressure) pressure.
How do you calculate reservoir pressure?
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.
What is reservoir pressure?
1. n. [Geology] The pressure of fluids within the pores of a reservoir, usually hydrostatic pressure, or the pressure exerted by a column of water from the formation’s depth to sea level.
What happens to bottom hole pressure when fluid level drops?
It occurs when the fluids cannot drop below the string as fast as the pipe upward movement. This gap of fluid movement below the string generates a suction force leading to a bottom hole pressure decrease and allowing the formation fluids to flow into the well.
How is PWF calculated?
Pwf = (-1/PI) q0 + Pr The maximum flow rate occurs at the maximum drawdown (Pwf=0).
What is typical reservoir pressure?
Average Reservoir Pressure (p or pR) The average reservoir pressure in a reservoir at a given time is an indication of how much fluid (gas, oil, or water) is remaining in the reservoir. It represents the amount of driving force available to drive the remaining fluid out of the reservoir during a production sequence.
What is initial reservoir pressure?
1. n. [Well Testing] The reservoir pressure measured in a discovery well, usually referred to as pi. This value is necessary for many reservoir engineering calculations, such as reserve determination.
Why is bottom hole pressure important?
An accurate prediction of well flowing bottom-hole pressure (FBHP) is highly needed in petroleum engineering applications such as for the field production optimization, cost per barrel of oil reduction, and quantification of workover remedial operations.
What is PWF in oil and gas?
Pwf = Bottom hole flowing pressure, psi. qm = Maximum theoretical oil rate when Pwf is lowered to atmospheric pressure, b/d. Ps = Static reservoir pressure, psi.