The capacity of a geothermal liquid to carry calcium varies mainly with the concentrations of CO, and HCO,, temperature and ionic strength, of which the CO, concentration (pressure) changes most in the wellbore. Wellbore models that carry accurate computations for CO, and other gas pressures might be adapted to compute profile thicknesses of CaCO, scale. A general model for carbonate scale depo...

Abstract Wellbore instability issues represent the most critical problems in Iraq Southern fields. These problems, such as hole collapse, tight and stuck pipe result tremendous increasing nonproductive time (NPT) well costs. The present study introduced a calibrated three-dimensional mechanical earth model (3DMEM) for X-field South of Iraq. This post-drill can be used to conduct comprehensive g...

Geomechanical studies are very important in the development stages of oil fields to solve many problems such as wellbore instability and sand production. However, this study is not complete without availability mechanical properties rocks. These estimate from petrophysical logs based on compressional shear wave velocities. But often missing most wells, reason might be cost-saving. Therefore, ai...

Oilfield Review Autumn 2011: 23, no. 3. Copyright © 2011 Schlumberger. ClearFRAC and HiWAY are marks of Schlumberger. In 1947, Stanolind Oil & Gas performed the first experimental hydraulic fracturing treatment in the Hugoton field in southwestern Kansas, USA. Since then, E&P companies have employed this reservoir stimulation technique extensively to enhance or prolong well productivity. Indeed...

Pipelines, wellbores and ground installations are permanently controlled by sensors spread across the crucial points in the whole area. One of the most popular techniques to support proper oil drive in a wellbore is a Gas Lift. In this paper we present the concept of using wireless sensor network (WSN) in the oil and gas industry installations. Assuming that Gas Lift Valves (GLVs) in a wellbore...

Abstract One of the most significant problems in oil and gas sector is swelling shale when it comes contact with water. The migration hydrogen ions (H + ) from water-based drilling fluid into platelets formation causes to swell, which eventually increases size sample makes structure weak. This results wellbore instability problem that ultimately reduces integrity a wellbore. In this study, was ...

Geopressured reservoirs can serve as ample source of geothermal energy with temperatures as high as 140 0C. Salinities are typically high in these reservoirs due to the dissolution of surrounding salt domes. Cement retrogression can occur under these geopressured geothermal conditions resulting from calcium silicate hydrate [3CaO2SiO23H2O] phase in hydrated cement converting to alpha dicalciu...

Geopolymer cement was evaluated as wellbore sealing material for carbon dioxide geosequestration application. Curing of cement system in saline water and strength testing in triaxial stress state condition under lateral confinement is relevant to primary cementing in CO2 geosequestration wellbore in saline aquifer. Geopolymer cement was cured in saline water (both at ambient conditions for 28 d...