Thesis (M.S.)--West Virginia University, 2003. / Title from document title page. Document formatted into pages; contains xii, 99 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 53-54).

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Decommissioning and abandonment is a relevant issue in the petroleum industry because of the complex operations involved and the results after the decision has been made. Several factors could lead to abandoning wells and decommissioning platforms, among others hurricanes, production decline, economic limit, etc. Decommissioning and abandonment operations have a great impact in the revenue stream which is either lost or temporarily deferred depending on the situation. Every year between 100-150 platforms are decommissioned and approximately 620 wells are abandoned in the Gulf of Mexico. A case-by-case scenario should be revised on an annual basis and all the possible options to be considered and submitted to the Government. This thesis presents an overview of the topic and an analysis on when decommissioning and abandoning alternatives are recommended for the optimization of the economical resources. / text

published_or_final_version / Electrical and Electronic Engineering / Master / Master of Philosophy

published_or_final_version / Electrical and Electronic Engineering / Master / Master of Philosophy

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

The purpose of this study was to assess the change in anthropometric measures, physical activity levels, food choices, and stage of change for seven health behaviors in adults who participated in fitness classes sponsored by Operation Wellness, a Robert Wood Johnson Local Initiatives Funding Partner grant, in Wells County, IN. Over the grant’s four years, 961 individuals 19 years of age and older enrolled in at least one semester-long Wellness University fitness class and completed both a pre-assessment and at least one post-assessment between the fall of 2003 and the summer of 2007. At baseline, 40.9 percent (n=286) of respondents reported engaging in either no exercise (n=35; 12.2%) or exercised only one to two days per week (n=82; 28.7%). After one semester, 81.4 percent met the goal of exercising aerobically for 30 minutes or more at least three times per week. Paired analysis indicated participants lost an average of three pounds (173.2±47.1 lbs. vs. 170.7±45.5 lbs.; t=2.02; p=0.045), lowered their systolic (125.9±15.9 mmHg vs. 121.5±16.6 mmHg (t=2.30; p=0.026) and diastolic 78.0±9.9 mmHg vs. 75.6±10.2 (t=1.80; p=0.05) blood pressure, and had a significant shift in their readiness to change in six of the seven health-related behaviors after only one semester. / Department of Family and Consumer Sciences

Naturally occurring pressure fluctuations have been observed in two-phase flows by a number of researchers for example Matsui [1984]. This thesis investigates the nature of these pressure fluctuations within vertically upward bubbly two-phase flows with a view to developing a novel non-intrusive pressure correlation technique for use downhole to monitor the area average dispersed phase velocity, Vg. To date non-intrusive correlation flow monitoring techniques suitable for use downhole exhibit a non-uniform field sensitivity characteristic which when correlated between two points reflects the velocity of the dispersed phase within the stronger sensing region. Four sources of pressure fluctuations were Identified In the present study, these being temporal variations in the average gas void fraction a(t), variations in the convected pressure field surrounding a moving bubble, turbulence generated by the wake of a bubble and background turbulence in the continuous phase. Magnitudes and structure length scales of these pressure sources were evaluated differentially at two points in a continuous fluid using simple models and it was found that pressure fluctuations associated with a bubbles motion close to the measurement points dominate the pressure signal. It was also found that the magnitude of pressure fluctuations associated with a bubble's motion decreases rapidly with increasing distance from the bubble and the structure length scale caused by this effect Is of the order of the tapping separation distance. Using numerical simulation techniques and a recirculating air/water flow loop with a test section diameter of 77.8mm, (both of which were developed in this thesis) differential pressure fluctuations generated by an upwardly flowing bubbly two-phase flow w ere studied. Superficial gas and liquid velocities up to 0.35m/s and 1.5m/s respectively and-. average gas void fractions up to 25% were covered. It was concluded that pressure fluctuations caused by bubble motion near the pipe wall dominate the differential pressure signal. The autocorrelogram of these signals is considered to be related to the bubble velocity within the entrapped bubble layer near the pipe wall, which are observed to travel at an almost constant velocity independent of the continuous phase velocity. Cross correlation of two pressure signals are indicated to be related to the convected bubble velocity of bubbles outside the entrapped bubble layer which is related to Vg.

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Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.