Title:

Analysis of a "Slug Test" or Drill Stem Test for Linear Flow

Authors:

A. Barelli

Conference:

Stanford Geothermal Workshop

Year:

1979

Session:

Pressure Transient Analysis

Language:

English

File Size:

739KB

View File:

Abstract:

The objective of this work is to provide a means for analyzing pressure transients from drill stem tests (DSTS) in fractured wells dominated by linear flow in the formation. The consequent partial differential equations have been solved by numerical inversion of the Laplace transform. hole with packers and connecting it instantaneously with the atmosphere by means of a drill-string. end of the test a level usually stabilizes in the string and the well does not produce spontaneously. 'The method can be applied only to the "analysis of DSTs in which the fluid influx into the drill pipe tends to kill the flow, giving only a partial DST recovery."1 The analysis is performed by type-curve matching, and leads to the determination of the initial reservoir pressure, flow characteristics of the formation, and wellbore damage. time pressure drawdown due to a constant flowrate. A DST consists of isolating an open stretch of bore- In water-dominated reservoirs, at the These parameters allow the prediction of early- Methods already exist in the literature' for analyzing these pressure transients in the presence of riidial flow in the formation. the fractured reservoirs found in some geothermal fields, linear flow models seem more appropriate than radial models.


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