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Is the skin always representative of the well damage?
Well AC-2 is a gas vertical well with a permanent downhole gauge at about 650mTVDss from the top perforations. This well started production a few weeks ago and a baseline/initial PBU test was acquired to monitor the well and reservoir performance over time. The PBU test from the permanent downhole gauge is shown in the...Tidal effects
The relative motion of the Earth, Moon and Sun results in some changes in gravitational forces that act on the sea and lithosphere. This creates some tidal changes in water depth and can lead to some changes in hydrostatic head and reservoir pressure for some offshore wells. These tidal effects can be observed with some...How much rate history to use in pressure transient analysis
This is a common question and a source of error. The rate data will affect the derivative plot, the selection of the interpretation model and the calculated well and reservoir parameters. Accuracy in the rate measurement The derivative is rate-normalized. As a result, the derivative of the PBU tests should share the same stabilization level,...
Deconvolution in well testing
The Deconvolution technique transforms variable rate and pressure data into a constant-rate initial drawdown pressure response with duration equal to the duration of the entire test. Plotting this response and its derivative with respect to the log of Δt versus the test duration Δt on a log-log scale gives the deconvolved response, as shown in...
5 main misconceptions about Deconvolution
Deconvolution came up about 10 years ago and has become the driving tool in well test analysis. However, deconvolution is still not often used in well test design, operations and interpretation. Perhaps due to these 5 main misconceptions. What is Deconvolution...? In a linear system with a single well, the well flowing pressure is...Reservoir Heterogeneities
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