# Bottom-hole Pressure

## bottom-hole pressure

[′bäd·əm ‚hōl ‚presh·ər]
(petroleum engineering)
Gas-drive pressure recorded at the bottom of an oil-well shaft; used to analyze oil-reservoir performance and evaluate the performance of downhole equipment.
The pressure in a well measured at a point opposite the producing formation.

## Bottom-hole Pressure

the pressure at the bottom of a working oil, water, or gas well. The pressure at the bottom of a standing or temporarily shut-in well is called the formation pressure. The bottom-hole pressure may be determined reliably by measuring with a depth manometer. Since producing beds (for example, oil beds) are never horizontal, hydro-dynamic analyses of bottom-hole and formation pressures are usually conducted as applied to some horizontal plane, taking into consideration the pressure of a column of bed fluid between the plane and the bottom of a given well. Consequently, a distinction is made between actual and reduced bottom-hole (formation) pressure.

References in periodicals archive ?
For example, the logarithmic derivative of bottom-hole pressure goes up and then goes down in the late time for gas-water reservoir systems with an active aquifer underneath.
Since bottom-hole pressure is sensitive to the size of grid, a nested grid technique was used in the model (Figure 2).
The dynamic change of the bottom-hole pressure tested is always susceptible to the wellbore storage effect.
[b.sub.D][e.sup.-2S] = 0, the model only has radial seepage, and the derivative curve of the bottom-hole pressure is a horizontal line, which conforms to the study results of Gringarten, Bourdet, et al.
By adopting this method, well liquid with initial pressure is pumped into the well at first, making the bottom-hole pressure equal or exceed the formation pore pressure to prevent further invasion of the borehole formation fluid.
In each production scenario the bottom-hole pressure will be set above the bubble point pressure and the reservoir will be always undersaturated.
Meaningful and realistic data was retrieved from this environment for the first time and downloaded from the returned microchip that showed the dynamic bottom-hole pressure of 7,500 psi and circulating bottom hole temperature of 190 degrees Fahrenheit, consistent with static bottom hole pressure of 6,700 psi due to mud weight and wireline tool recorded static bottom hole temperature at 235 degrees.
Chris Faulkner, CEO of Breitling Oil and Gas, said, "We are kicking off our Gulf Coast on-shore initiative with a prime re-completion prospect in the Hackberry formation and potentially fracing a new Frio pay zone simultaneously." Faulkner added, "The initial bottom-hole pressure is coming in at 9000 psi and both existing fracs are intact and not watered out." For more information on this and other activities of the Company, see the Breitling Oil and Gas web site at http://www.breitlingoilandgas.com
At the start of the simulation, we let the gas well produce at constant rate; when the bottom-hole pressure reaches a certain value, the production regime switches to constant bottom-hole pressure.
Although they discussed the influence on production behavior caused by different bottom-hole pressure and Langmuir pressure, some key factors were neglected such as the number of hydraulic fractures.
When a new field is discovered or a new area of an existing field is opened for development, bottom-hole pressures are high and life is good.

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