Supercharging is a dynamic condition which extends the hydrostatic pressure of mud in the wellbore beyond the filter-cake into the reservoir. This effect is most noticeable in reservoirs which have low permeability and /or a poor filter cake. No practical procedures
How to Analyze Pressure Transient Data - HogoNext
Jul 28, 2024 · This in-depth guide will explore the intricacies of PTA, its significance, the different types of pressure transient tests, data acquisition and quality control, analysis methods, interpretation of results, and the application of specialized software tools.
Dec 16, 2020 · "The Loss Ratio Method of Extrapolating Oil Well Johnson and Bollens proposed a plot of the loss ratio versus time. Decline Curves," Trans. AIME (1927) 77, 771. A linear plot of loss ratio versus time implies that b(t) = constant (hyperbolic decline). A constant loss ratio versus time implies that b(t) = 0 (exponential decline).
We propose an interpretation method based on the analysis of the derivative of pressure with respect to the appropriate time function-natural logarithm of time or Homer/superposition time functions. This method considers the response as a whole, from very-early-time data to the last recorded point, and uses the type curve-matching technique.
Formation fluid pressure from repeat formation testers
Feb 17, 2022 · Plot mud hydrostatic and formation pressure at the well site to recognize anomalies or tool errors and to optimize station coverage. Occasionally repeat formation pressure measurements at the same depth to check for consistency.
An analytical solution for spherical fluid flow modeling in …
Sep 1, 2021 · In this study, an analytical solution for fluid flow modeling in spherical coordinates with non-uniform initial pressure is presented. This new procedure takes into account the effect of mud invasion, or, in other words, the supercharging effect.
Petroleum Exploration & Production - Software Training
Pressure Transient Analysis, or PTA, is, in most cases, about analyzing high frequency, high resolution shut-in data. The data are captured during dedicated well test operations such as DSTs or production tests or during routine operational shut-ins by Permanent Downhole Gauges (PDG).
Scrivener Publishing: Formation Testing: Supercharge, Pressure …
This new volume, the third in Wiley-Scrivener's series on formation testing, reviews pressure transient interpretation and contamination analysis methods, providing numerous practical discussions and examples with rigorous formulations …
Supercharging Assessment in Formation Pressure Measurements …
Apr 24, 2017 · Supercharging is increased sand face pressure caused by drilling fluid filtrate leak-off. The study is carried on one of the well-known carbonate reservoir of the North Sea. This...
PTA Diagnostic Plot - nafta.wiki
PTA Diagnostic Plot with ETR, MTR and LTR time zones. Pressure drop is in blue and log-derivative is in red.