High-level integrity assessment of abandoned wells

Identification and characterization of high methane-emitting abandoned oil and gas wells.

Recent measurements of methane emissions from abandoned oil/gas wells show that these wells can be a substantial source of methane to the atmosphere, particularly from a small proportion of high-emitting wells. However, identifying high emitters remains a challenge. We couple 163 well measurements of methane flow rates; ethane, propane, and n-butane concentrations; isotopes of methane; and nobl...

The integrity of oil and gas wells.

Public concerns about oil and natural gas extraction these days inevitably turn to hydraulic fracturing, where millions of gallons of water, sand, and chemicals are pumped underground at high pressures to crack open rocks. Hydraulic fracturing often occurs a mile or more down, far from the water we drink or the air we breathe. The focus for safety and environmental stewardship should often be s...

Targetting PLDs for high-level High Integrity Systems Development

Combined hardware/software systems are increasingly being used for safety-critical systems, with hardware taking processing load off the software. We have produced a design template that allows SPARK Ada, a programming language used for safety-critical systems development, to be compiled and interpreted on programmable logic devices. In this paper we describe a high-integrity PLD-based interpre...

assessment of the efficiency of s.p.g.c refineries using network dea

data envelopment analysis (dea) is a powerful tool for measuring relative efficiency of organizational units referred to as decision making units (dmus). in most cases dmus have network structures with internal linking activities. traditional dea models, however, consider dmus as black boxes with no regard to their linking activities and therefore do not provide decision makers with the reasons...

Shall evidence-based risk assessment be abandoned?