Gas-lifted oil wells are susceptible to failure through malfunction of gas lift valve assemblies (GLV). One failure mode occurs when the GLV check valve fails and product passes into the well annulus, potentially reaching the wellhead. This is a growing concern as offshore wells are drilled thousands of meters below the ocean floor in extreme temperature and pressure conditions, and repair and ...

By Surgn.-Capt. P. IIeiiiu, m.d., f.r.s.e., d.p.h. Camb., Fellow, Santy. Inst., Fellow of British Inst., Pub. Health, Health Officer, Chudderghat Municipality. 1 iieiie are three varieties ot wells, shallow or superficial, deep and artesian. The last mentioned may be considered a variety of deep well, and we will dispose of it with a few words, for the reason that artesian wells have, up to dat...

Coastal areas usually involves in several kinds of water use, such as agricultural, industrial, and drinking, which are needed to be considered as important in water management systems. There is a need to study the sustainable water resources management in different terms. A combined methodology, which considers the human activities, as well as environmental problems according to some criteria,...

This paper is the first of a series that attempts to assess the possible health and safety risks associated with large scale CO2 sequestration in deep brine reservoirs. The approach is based on analysis of available data on the operational track record from CO2 transportation and injection associated with enhanced oil recovery (CO2-EOR) in the US. This paper is particularly concerned with ident...

Three measurements of head at unique locations form a three-point estimator of the local magnitude and orientation of the hydraulic gradient. The relative head measurement error (RHME) is defined here as the measurement error normalized by the head drop across the three-point estimator. Monte Carlo simulation results show that estimators with base to height ratios between 0.5 and 5.0 and that a...

BACKGROUND In 2006, three farmers died at the bottom of an agricultural shallow well where the atmosphere contained only 6% oxygen. This study aimed to document the variability of levels of oxygen and selected hazardous gases in the atmosphere of wells, and to identify ambient conditions associated with the low-oxygen situation. METHODS A cross-sectional survey, conducted in June 2007 and Jul...

According to a criticaster Wehkamp owns “fossil COBOL in rock”. In 1995 Wehkamp decided to get rid of her mainframe. Her strategy was to stop development on her GCOS8 platform. The idea was that the mainframe would dry and eventually could be carried to her grave. Unfortunately this strategy did not work. In fact complexity has grown beyond control. In the first part of the talk we will give a ...