Macro Insights from Interval Pressure Transient Tests: Deriving Key Near-Wellbore Fracture Parameters in a Light Oil Reservoir Offshore Norway

Alfredo Freites, Patrick Corbett, Sebastian Geiger, Jens-Petter Norgard

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


Fractures can be first-order controls on fluid flow in hydrocarbon reservoirs. Understanding the characteristics of fractures such as their aperture, density, distribution, conductivity, connectivity, etc, is key for reservoir engineering and production analysis.

Well testing plays a key role in the the characterisation of fractured reservoirs, especially. New advances in the Pressure Transient Analysis (PTA) have enabled the interpretation of production data in a way where the resulting geological scenarios are in better agreement with fracture patterns observed in outcrop analogues.

Traditionally, Drill Stem Test (DST) data have been the primay source of information for well testing. However, we hypothesise that wireline conveyed tools designed for Interval Pressure Transient Testing (IPTT) could yield a more throrough description of the near-wellbore heterogeneities, including fractures.

Hence, we investigate the applicability of IPTT for characterising fractured reservoirs using detailed numerical simulations models with accurate wellbore representation to generate synthetic IPTT responses that can obtained through a next-generation wireline testing tool called SATURN. We particularly focus on cases where fractures are present in the near-wellbore region but do not intersect the wellbore. The study included parameters such as fracture densities and conductivities, distance between fractures and wellbore and the vertical extension of the fractures across geological beds.

The impact of the different fracture scenarios on the pressure transient tests was recorded as characteristic signatures on diagnostic plots (pressure derivative curves). We have called these curves "IPTT-Geotypes"; they can be used to assist the interpretation process of IPTT responses. To the best of our knowledge, this is the first time pressure derivative type curves for IPTT in fractured reservoirs are presented in the literature.

A field example of an IPTT case was analysed using the concept of geological well testing. We integrated the information from petrophysical logs and the IPTT-Geotypes to assist the calibration of a reservoir model developed to represent the geological setting of the tested reservoir interval. The results provided a sound interpretation of the reservoir geology and quantitative estimation of the matrix and fracture parameters.
Original languageEnglish
Title of host publicationSPE Europec featured at 81st EAGE Conference and Exhibition
PublisherSociety of Petroleum Engineers
ISBN (Print)9781613996614
Publication statusPublished - 3 Jun 2019
Event81st EAGE Conference and Exhibition - Excel Centre, London, United Kingdom
Duration: 3 Jun 20196 Jun 2019

Publication series

NameSociety of Petroleum Engineers - SPE Europec Featured at 81st EAGE Conference and Exhibition 2019


Conference81st EAGE Conference and Exhibition
Country/TerritoryUnited Kingdom
Internet address

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology
  • Fuel Technology


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