Interpretation of multirate tests by the pressure derivative - I. Oil reservoirs

D. Tiab, I. N. Ispas, A. Mongi, A. Berkat

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Pressure build-up data in low permeability reservoirs take too long and are usually of poor quality. It is often not economically feasible to shut in a well with a high production rate for a buildup test. Sand producing wells are not good candidates for long pressure drawdown tests. It is often impracticable to maintain a constant rate long enough to complete a drawdown test. In these cases, a multi-rate flow test should be run instead of buildup or drawdown tests. Actually a well-designed multi-rate flow test may minimize the influence of wellbore storage on pressure data. A new technique based on the pressure derivative concept is presented for interpreting a multi-rate flow test. It is shown here that a Cartesian plot of the pressure derivative data versus a time group is a straight line from which the reservoir permeability can be estimated. It is also shown that for the case of two-rate test, Tiab's Direct Synthesis technique is applicable for calculating permeability and skin A step by step procedure is presented for interpreting a multirate test using pressure and pressure derivative data. This new technique is illustrated by several numerical examples.

Original languageEnglish
Title of host publicationLatin American and Caribbean Petroleum Engineering Conference
PublisherSociety of Petroleum Engineers (SPE)
ISBN (Electronic)9781555633653, 9781555633653
DOIs
StatePublished - 1999
EventLatin American and Caribbean Petroleum Engineering Conference - Caracas, Venezuela, Bolivarian Republic of
Duration: Apr 21 1999Apr 23 1999

Publication series

NameSPE Latin American and Caribbean Petroleum Engineering Conference Proceedings
Volume1999-January

Conference

ConferenceLatin American and Caribbean Petroleum Engineering Conference
Country/TerritoryVenezuela, Bolivarian Republic of
CityCaracas
Period04/21/9904/23/99

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