Pressure measurements

The pressure measurment and fluid sampling procedures can be repealed at multiple depths in the reservoir. 

Pressure measurements are not often quoted in the text but the unit of Torr, where 1 Torr= 1 mmHg = 133.322 387 Pa, is a convenient practical unit and appears occasionally. 

A static bottom hole pressure survey (SBHP) is useful for determining the reservoir pressure near the well, undisturbed by the effects of production. This often cannot be achieved by simply correcting a surface pressure measurement, because the tubing contents may be unknown, or the tubing contains a compressible fluid whose density varies with pressure (which itself has an unknown profile). 

SDY(I) cols 1-10 standard deviation of pressure measurement SDX(I,l)cols 11-20 standard deviation of temperature measurement SDX(l,2)cols 21-30 standard deviation of liquid composition measurement 

Heydemann P L M 1997 The Bi l-ll transition pressure measured with a dead-weight piston gauge J. Appi. Phys. 38 2640 

COPPERALLOYS-WROUGHTCOPPERANDWROUGHTCOPPERALLOYS] (Vol7) -for pressure gauge elements [PRESSURE MEASUREMENT] (Vol 20) 

Zhao Y, Barvosa-Carter W, Theiss S D, Mitha S, Aziz M J and Schiferl D 1998 Pressure measurement at high temperature using ten Sm YAG fluorescence peaks J. Appi. Phys. 84 4049 

The gradients may be caloulated from surface fluid densities, or may be directly measured by downhole pressure measurements using the repeat formation testing tool (RFT). The interfaces predicted can be used to confirm wireline measurements of fluid contact. 

Keywords d rec methods, indirect methods, rock properties, coring, core barrel, standard core analysis, special core analysis, slabbed core, sidewall samples, direct indications, microfossils, sonde, logging unit, invasion, mudcake, formation pressure measurement, fluid sampling, measurement while drilling, formation evaluation while drilling. 

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