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Pressure transient testing (view source)
Revision as of 17:45, 21 January 2022
, 17:45, 21 January 2022added Category:Methods in Exploration 10 using HotCat
===Pressure buildup tests===
===Pressure buildup tests===
In a pressure buildup test, one should stabilize the rate in the tested well for several days, that is, maintain the rate approximately constant. Then place a pressure measuring device as near the perforations as possible several hours before shut-in. Shut the well in and let the pressure build up. The rate at which pressure builds up with time reflects the formation properties. (For more details of pressure buildup and flow tests, see Matthews and Russell.<ref name=pt09r16>Matthews, C. S., Russell, D. G., 1967, Pressure buildup and flow tests in wells: Dallas, TX, Society of Petroleum Engineers Monograph Series No. 1, 172 p.</ref>)
In a pressure buildup test, one should stabilize the rate in the tested well for several days, that is, maintain the rate approximately constant. Then place a pressure measuring device as near the perforations as possible several hours before shut-in. Shut the well in and let the pressure build up. The rate at which pressure builds up with time reflects the formation properties. (For more details of pressure buildup and flow tests, see Matthews and Russell.<ref name=pt09r16>Matthews, C. S., and D. G. Russell, 1967, Pressure buildup and flow tests in wells: Dallas, TX, Society of Petroleum Engineers Monograph Series No. 1, 172 p.</ref>)
==Multi-rate flow tests==
==Multi-rate flow tests==
* Δ''p''<sub>lhr</sub> = pressure change in first hour of test (psi)
* Δ''p''<sub>lhr</sub> = pressure change in first hour of test (psi)
* ''ϕ'' = [[porosity]] (fraction)
* ''ϕ'' = [[porosity]] (fraction)
* ''μ'' = viscosity (cp)
* ''μ'' = [[viscosity]] (cp)
* ''c''<sub>t</sub> = total compressibility of formation and its fluids (psi<sup>–1</sup>)
* ''c''<sub>t</sub> = total compressibility of formation and its fluids (psi<sup>–1</sup>)
* ''r''<sub>w</sub> = wellbore radius or hole size (ft)
* ''r''<sub>w</sub> = wellbore radius or hole size (ft)
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Interference tests are run by first shutting in the portion of the reservoir in the area affected by the test. Then one produces (or injects into) one well (called the active well) and measures the pressure response in the offset wells. [[:file:pressure-transient-testing_fig9.png|Figure 9]] shows a typical interference test pattern, and [[:file:pressure-transient-testing_fig10.png|Figure 10]] is a plot of a typical response in an observation well.
Interference tests are run by first shutting in the portion of the reservoir in the area affected by the test. Then one produces (or injects into) one well (called the active well) and measures the pressure response in the [[offset]] wells. [[:file:pressure-transient-testing_fig9.png|Figure 9]] shows a typical interference test pattern, and [[:file:pressure-transient-testing_fig10.png|Figure 10]] is a plot of a typical response in an observation well.
Pulse tests are performed by first producing (or injecting into) the active well for a few hours. The active well is then shut-in, then returned to production, shut-in again, and so on in a regular, repeating pattern. The response in the offset wells is then measured while continuing to produce all wells in the field except those directly involved in the test. This is possible because the “noise” caused by continued production of wells not directly involved in the test can be filtered out using the response caused by the repeated on-off pattern in the active well. [[:file:pressure-transient-testing_fig11.png|Figure 11]] shows a typical response in a pulse test observation well.
Pulse tests are performed by first producing (or injecting into) the active well for a few hours. The active well is then shut-in, then returned to production, shut-in again, and so on in a regular, repeating pattern. The response in the offset wells is then measured while continuing to produce all wells in the field except those directly involved in the test. This is possible because the “noise” caused by continued production of wells not directly involved in the test can be filtered out using the response caused by the repeated on-off pattern in the active well. [[:file:pressure-transient-testing_fig11.png|Figure 11]] shows a typical response in a pulse test observation well.
[[Category:Production engineering methods]]
[[Category:Production engineering methods]]
[[Category:Methods in Exploration 10]]