i work in the oil field, im a trainee, what is hydrostatic pressure?

Question

im a trainee and i kinda know what hydrostatic pressure is and how it is related to drilling and borehole pressures etc. but i want an easy quick shor defination if anybody who reads this yahoo crap works in the oilfield

Answer 1

Hydrostatic pressure simply means the pressure (pounds per square inch) that a fluid has when confined and compressed (often by its own weight in the case of column of fluid). "Hydro" means water or, more generally, fluid and "static" means stationary, which means that the pressure persists, and is not transient like a hammer blow. Being fluid, the pressure is "isotropic", meaning it does not depend on direction. Contrast this with uniaxial pressure. That means the pressure (more generally referred to as stress) is only in one direction like a stationary drill shaft resting on the bottom of the hole. uniaxial pressure can only be experienced by a solid. The solid's material strength prevents the shaft from expanding (like a fluid would) and exterting pressure on the sides of the bore hole. Uniaxial stress can be also be negative (then called tension) like when the shaft is supporting it's own weight. Another form or stress is shear stress. That's what a bit experiences while digging that causes the bit to twist. This too can only be supported by a solid. These are all basic concepts that need to be understood in your line of work so that you learn the limits of the equipment. Good luck and don't break anything.

Answer 2

An item used to test the fluid pressure of somethig submerged in water. For example, if you work in the plants and you want to test how much pressure is on a given pipe or valve you will test the hydrostatic pressure

Answer 3

It generally means the pressure generated at the bottom of a water column with the height (or depth) in question. Every foot of water column height contributes about 0.433 psi of pressure.

If while drilling, you suddenly transition from a hydrostatic head to the equivalent pressure of a column of rock, things can get ugly.

Answer 4

Fluid pressure
From Wikipedia, the free encyclopedia
(Redirected from Hydrostatic pressure)
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Fluid pressure is the pressure on an object submerged in a fluid, such as water. The pressure can be provided from a number of sources:

the sheer weight of the fluid, such as in scuba diving, when the diver goes deeper into the water, the water pressure increases; or in the earth's atmosphere, as a plane goes higher, the air pressure decreases;
a pump, such as when water "pumped" into a water tower; or
a compressor, such as in a small water supply system in a rural well for a house connected to an air compressor. Water pressure is used in our daily lives to control the flow of water coming from any mechanical water source.
Fluid pressure occurs in one of two situations:

an open condition, such as the ocean, or a swimming pool, or
a closed condition, such as a water line or a gas line.
Open conditions are considered to be "static" or not moving (even in the ocean where there are waves and currents) because the fluid is essentially "at rest." The pressure in open conditions conform with principles of fluid statics.

Closed bodies of fluid are either "static," when the fluid is not moving, or "dynamic," when the fluid is moving, like through a pipe. The pressure in closed conditions conform with the principles of fluid dynamics.

The concepts of fluid pressure are predominantly attributed to the discoveries of Blaise Pascal and Daniel Bernoulli.

Contents [hide]
1 Concepts of fluid pressure
1.1 Hydrostatic pressure
1.2 Fluid dynamic pressure
2 Applications
3 See also



[edit]
Concepts of fluid pressure
There are two components to pressure: force and area. The more force, the larger the pressure; the more area, the smaller the pressure. As such, the force on an object in contact with fluid depends on three factors (as summarized in Bernoulli's equation):

Is the fluid at rest or moving? If moving, how fast and in what direction in relation to the object?
What is the vertical distance from the surface of the fluid (if a liquid) to the object?
Are there any sources of pressure, such as from a pump or compressor?
[edit]
Hydrostatic pressure
In the case where the fluid is at rest, called fluid statics or hydrostatics (from hydro meaning "water" and static meaning "at rest"), the force acting on the object is the sheer weight of the fluid above, up to the water's surface—such as from a water tower. The resulting hydrostatic pressure (static pressure) is isotropic: the pressure acts in all directions equally, according to Pascal's law:


where:

ρ (rho) is the density of the fluid (the practical density of fresh water is 1000 kg/m3);
g is the acceleration due to gravity (practical value 10 m/s2 );
h is the height of the water column in metres.
In the following example. Assume a water column 1 metre high, the pressure on the floor of the column will be:

Pa.
The pressure increases linearly with the water depth.

[edit]
Fluid dynamic pressure
Next, when the fluid is moving in a pipe, called fluid dynamics or hydrodynamics (dynamics meaning "moving" or "changing"), the interaction of the fluid with the walls of the pipe creates friction and energy loss. In fluid dynamics, the fluid pressure is anisotropic (not isotropic), i.e. the pressure is not the same in all directions. The anisotrophy is mainly caused by the friction losses, so the further an object is away from the surface of the fluid (assuming the fluid is moving from the fluid surface to the object), the less pressure there will be on that object in the fluid. (Note: There are other reasons for the anisotrophy that are beyond the scope of this article.) These concepts are mathematically explained by Bernoulli's equation, and are applicable to all fluids.

Consider this simplified example: assume a 10 m high water tower with a large reservoir, that would give us a static pressure of 100,000 Pa (100 kPa or 100,000 N/m2 at ground level. Now connect a 100-metre long horizontal pipe to the bottom of the column. From experiment it is known that the friction loss in this typical pipe, depending on material and diameter, is 100 Pa per metre of pipe length. So for the 100 metre pipe, that would be 10 kPa of pressure loss. So the pressure at the end of our pipe would be 100 kPa - 10 kPa = 90 kPa.

Answer 5

http://en.wikipedia.org/wiki/Hydrostatic_pressure