Effect Of Partial Pressure Ratio Research Articles

Investigation on Material Selection in Missan Oilfields Similar Environment

This paper analyzed the corrosion environment of Missan oilfields and investigated the oilfield country tubular goods used in other similar oilfields. Summarized the effect of partial pressure ratio of H2S/CO2 and Cl-to the corrosion behavior of OCTG. This paper concluded the service condition, test results and anti-corrosion mechanism of carbon steel, low-chrome steel, modified martensitic stainless steel and nickel alloy. Finally arrived at conclusion that the nickel alloy can meet the requirement of Missan oilfields, some literature reported that the modified martensitic stainless steel can apply in H2S/CO2 environment. In the condition that be easy to replace the tubular, carbon steel and low-chrome steel tubular can meet the requirement with corrosion inhibitor.

Self-consistent particle-in-cell/Monte Carlo simulation of RF magnetron discharges of oxygen/argon mixture: effects of partial pressure ratio

The characteristics of RF planar magnetron discharges of O/sub 2//Ar mixture are clarified using the particle-in-cell/Monte Carlo method. The simulation is carried out for axisymmetrical magnetic fields. The spatial and temporal behavior of magnetron discharge is examined in detail. The O/sup -/ ions are trapped in the plasma bulk by the time-averaged potential. The O/sup -/ density is governed by a balance of generation and loss of O/sup -/. The positive ions Ar/sup +/, O/sub 2//sup +/, and O/sup +/ are distributed in such a way that the charge neutrality is kept in the plasma bulk. Since the peak point of O/sup -/ density does not coincide with that of electron density, the spatial distributions of Ar/sup +/, O/sub 2//sup +/, and O/sup +/ have two peaks. The number densities of Ar/sup +/ and O/sup -/ ions drastically increase when oxygen is added to the discharge gas Ar, and then saturated. In the case when the mole fraction of oxygen increases, the self-bias voltage on the target decreases. This phenomenon is investigated in detail and a clear physical explanation is presented.