Analysis of the Inflow and Pressure Buildup Under Impending Blowout Conditions

[+] Author and Article Information
S. Miska, F. Luo, A. Schafer-Perini

Department of Petroleum Engineering, New Mexico Institute of Mining and Technology, Socorro, NM 87801

J. Energy Resour. Technol 114(1), 46-53 (Mar 01, 1992) (8 pages) doi:10.1115/1.2905920 History: Received November 01, 1989; Revised July 25, 1991; Online April 16, 2008


In this study a technique is provided for determining formation pore pressure and flow properties based upon analysis of shut-in drill pipe pressure. Both radial and spherical transient flow of slightly compressible fluid are considered. Solutions are provided in dimensionless forms. A newly developed concept of effective (equivalent) flowing rate and time is applied to replace the unknown variable flow rate which takes place prior to shutting-in the well. Two numerical examples show how to utilize the information on pit gain, approximate flow-in time and the shut-in drill pipe pressure to determine formation fluid pressure. Fluid mobility (spherical flow) and formation transmissibility (radial flow) can also be determined from knowledge of shut-in drill pipe pressure as a function of time. Application of the proposed method is simple, and therefore, useful on the rig floor.

Copyright © 1992 by The American Society of Mechanical Engineers
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