Difference between revisions of "Methods for obtaining formation fluid pressures"

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| *  Calculating hydrostatic pressures from measured water density or salinity *  Estimating hydrostatic pressures from fluid density using R<sub>w</sub> (formation water resistivity) *  Using the weight of drilling mud *  Using the rule-of-thumb pressure gradient, 0.465 psi/ft
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Revision as of 16:00, 30 January 2014

Exploring for Oil and Gas Traps
Series Treatise in Petroleum Geology
Part Critical elements of the petroleum system
Chapter Formation fluid pressure and its application
Author Edward A. Beaumont, Forrest Fiedler
Link Web page
Store AAPG Store

Methods for obtaining formation fluid pressures can be divided into two groups: measured and estimated. The table below lists the methods by these two categories.

Measured Estimated
  • Using RFT (repeat formation tester) data
  • Using reservoir bottom-hole pressure buildup tests
  • Using DST shut-in pressures
  • Calculating hydrostatic pressures from measured water density or salinity
  • Estimating hydrostatic pressures from fluid density using Rw (formation water resistivity)
  • Using the weight of drilling mud
  • Using the rule-of-thumb pressure gradient, 0.465 psi/ft

Accuracy of measured pressures[edit]

RFTs, DSTs, and bottom-hole pressure buildup tests measure formation fluid pressures. Pressure gauge accuracy is a critical factor in all three tests, but the BHP measurement is generally more precise due to the greater time taken for the test. Generally two types of gauges measure pressures: strain and quartz. The table below shows the accuracy and precision of both types.

Gauge type Accuracy (% Full Scale) Precision
Strain Gauge 0.18
Quartz Gauge 0.025 0.01 psi

See also[edit]

External links[edit]

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drill stem test

bottom hole pressure

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