An Economical Method of Rapid Reservoir Testing

Abstract

A tool designed for formation sampling during drilling has been placed in Canadian field operations for over two years. Relatively large fluid samples are recovered and a formation pressure build-up obtained without retrieving the drill pipe. This paper discusses the mechanical operation of the tool as well as the characteristics of sample recoveries and pressure data. Typical examples are given.Qualitative reservoir information may be obtained to assist the operator in further evaluation and completion operations. Special applications include aid in the location of gas-oil and oil-water contacts, the calculation of potentiometric surfaces and the determination of reservoir continuity or segregation. An economic comparison with conventional drill-stem testing is made to illustrate the possible extent of savings. A summary of operations is given, describing the tool's performance and the results achieved.