Date of Award

1995

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Petroleum Engineering

First Advisor

Adam T. Bourgoyne, Jr

Abstract

An experimental study to investigate the bullheading method of well control was performed. The primary focus of the investigation was the downward displacement of gas by liquid, requiring consideration of counter-current flow behavior. Experiments were conducted in a full-scale well, using a computer-controlled downhole fracture simulation system; water and low-viscosity drilling mud were used for bullheading fluids. The results from these experiments provided simple models for the estimation of removal efficiency and maximum pump pressure during bullheading operations. These models are empirical and are limited to conditions within the range of the experimental data. A two-phase flow analysis of the annulus at the time fracturing starts provided insight into the mechanisms present during bullheading.

Pages

77

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