The Application of Transient Pressure Testing to Track Phase Boundaries During Production - A ONE WELL CASE STUDY FROM UKSC

Contaminants such as CO2, H2S and O2 in liquid and gas pipelines in the presence of water create an aggressive environment conducive to internal corrosion. During pipeline operations, solids deposition, water accumulation, bacterial activities and improper chemical inhibition aggravate the internal corrosion attack. For assessing the threat of internal corrosion the industry has only three integrity validation tools at its disposal. These are Pressure Testing, In Line Inspection (ILI) and Internal Corrosion Direct Assessment (ICDA). To enhance pipeline integrity for piggable and non-piggable pipelines, NACE International published a variety of Standard Practices for the ICDA protocols for predicting time-dependent internal corrosion threats for various products in both offshore and onshore in sweet or sour service. All ICDA protocols are a structured, iterative integrity assessment process, consisting of the following four steps: Pre-assessment, Indirect Inspection, Detailed Examination and Post-assessment. Most importantly, unlike ILI and pressure testing, all ICDA standards require a mandatory root cause analysis and a go forward mitigation plan to arrest the corrosion processes being encountered. This paper reviews one case study; LP-ICDA for three (3) “piggable” refined product pipelines from the Jetty to the onshore marketing terminal. This paper will be useful for the pipeline operators to provide guidance on not only identifying the locations at which internal corrosion activity has occurred but also look into how the operators used the ICDA program to better manage their asset.

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Effects of a Partially Communicating Fault in a Composite Reservoir on Transient Pressure Testing

SPE Formation Evaluation ◽

10.2118/16764-pa ◽

1989 ◽

Vol 4 (02) ◽

pp. 210-218 ◽

Cited By ~ 23

Author(s):

A.K. Ambastha ◽

P.G. McLeroy ◽

A.S. Grader

Keyword(s):

Transient Pressure ◽

Pressure Testing

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Systematic Application of Pressure and Temperature Transient Analysis in an Oil Field: A Case Study

10.2118/205145-ms ◽

2021 ◽

Author(s):

Khafiz Muradov ◽

Akindolu Dada ◽

Sultan Djabbarov

Keyword(s):

Transient Analysis ◽

Management Practices ◽

Oil Field ◽

Well Test ◽

Transient Pressure ◽

Systematic Application ◽

Temperature Transient ◽

Fluid Properties ◽

Temperature Transient Analysis

Abstract Pressure Transient Analysis (PTA) methodology has long enabled well testing to become a standard routine. Modern, well and reservoir monitoring and management practices are now unthinkable without the well test-derived estimates of KH products, skin factors, radii of reservoir boundaries, etc. Temperature data, measured together with the pressure, is widely available. Multiple methods for Temperature Transient Analysis (TTA) have also been developed, but have not yet gained due recognition. Few examples of a systematic application of PTA and TTA (or, in general, Pressure and Temperature Transient Analysis PTTA) on a field scale have been published. Given that the TTA radius of investigation is much smaller than that for PTA, the TTA tends to explore the near-wellbore properties including the near-wellbore permeability profile, depth of damage, multi-layer parameters, fluid properties, etc. This complements the far-field estimates made by PTA, resulting in the PTTA providing a more holistic and complete picture of the state of the reservoir and fluids around the wellbore. This work demonstrates a case study of a systematic application of PTTA methods to wells in a green, oil field. The wells are equipped with a state-of-the-art, downhole, permanent monitoring equipment. A user-friendly, bespoke toolbox has been developed to carry out PTTA analysis in this field. Dozens of transient events that occurred in the first few years of the field production life have been analyzed using PTTA. There are multiple examples of this PTTA analysis demonstrating improved characterization of the reservoir, near-wellbore, fluid, and multi-layer properties. This work will be insightful to those looking to find out what additional, useful information (like reservoir and fluid properties) can be extracted from the traditional well-test, transient pressure and temperature measurements at no extra cost.

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