Vertical Interference Testing With a Wireline-Conveyed Straddle-Packer Tool

Abstract

Vertical Interference Testing With a Wireline-Conveyed Straddle-Packer Tool J.J. Pop; J.J. Pop Schlumberger Well Services Search for other works by this author on: This Site Google Scholar R.A. Badry; R.A. Badry Schlumberger Search for other works by this author on: This Site Google Scholar C.W. Morris; C.W. Morris Schlumberger Search for other works by this author on: This Site Google Scholar D.J. Wilkinson; D.J. Wilkinson Schlumberger-Doll Research Search for other works by this author on: This Site Google Scholar Peter Tottrup; Peter Tottrup PanCanadian Petroleum Ltd. Search for other works by this author on: This Site Google Scholar J.K. Jonas J.K. Jonas Schlumberger Well Services Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, October 1993. Paper Number: SPE-26481-MS https://doi.org/10.2118/26481-MS Published: October 03 1993 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Pop, J.J., Badry, R.A., Morris, C.W., Wilkinson, D.J., Tottrup, Peter, and J.K. Jonas. "Vertical Interference Testing With a Wireline-Conveyed Straddle-Packer Tool." Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, October 1993. doi: https://doi.org/10.2118/26481-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Annual Technical Conference and Exhibition Search Advanced Search AbstractA new approach to the in-situ determination of permeability, permeability anisotropy and lateral continuity of barriers to vertical fluid flow is introduced. The procedure employs a wireline-conveyed inflatable straddle-packer in conjunction with a vertically displaced pressure monitor probe to conduct vertical interference tests in openhole. The relatively large spacing between the packer interval and monitor probe (approximately 5 ft) results in a larger depth of investigation than is currently available with other wireline-conveyed tools. Multiple interference tests may be conducted during a single trip in the well.The method of analysis is illustrated with data acquired in an oil well located in a complex, low-permeability, carbonate reservoir that has been under production for almost 40 years and under waterflood for approximately 30 years. As part of a field management program the operator wished to assess the status of pressure maintenance by means of a pressure survey and to measure the permeability anisotropy for use in subsequent numerical simulation work. Analysis of core data indicated that the permeability anisotropy should be low.Feasibility of the testing procedure was established bearing in mind the restriction that flowrates would have to be limited during the pumping and sampling sequences to keep the test pressure above the bubble point pressure. Computer modelling and automatic parameter estimation techniques were employed to estimate the permeability and permeability anisotropy from the interference test data. Electrical and nuclear logs in conjunction with core photographs provided the means to establish the boundaries of the zones tested and to locate the major lithologic units. For comparison the pressure transients measured in the packer interval were analysed by established well testing methods.IntroductionIn a recent article Weber and van Geuns stated that,"The key to successful simulation is to recognise and evaluate the key parameters that have a major influence on fluid flow. In many cases this will be the vertical permeability profile.Although it is generally accepted that vertical permeability in a sand unit is almost always significantly lower than thehorizontal permeability, little is usually done to measure realistic vertical permeabilities."-JPT October 1990Shortly before this article was published a new class of wireline formation testers was introduced that can provide the very information envisaged as useful in the above cited article.P. 665^ Keywords: permeability, configuration, drillstem testing, module, pressure transient testing, pressure transient analysis, formation parameter, vertical interference testing, pumpout module, packer interval Subjects: Formation Evaluation & Management, Pressure transient analysis, Drillstem/well testing This content is only available via PDF. 1993. Society of Petroleum Engineers You can access this article if you purchase or spend a download.