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Summary Water production becomes a major problem as hydrocarbon-producing fields mature. Higher levels of water result in increased corrosion and scale, load on fluid-handling facilities, environmental concerns, eventually well shut-in (with associated workover costs). Consequently, producing zones are often abandoned an attempt to avoid contact, even when the intervals still retain large volumes recoverable hydrocarbons. Many polymer systems have been applied over years control undesired...

Summary This paper presents a comprehensive comparison of different dynamic and static approaches for assessing building performance under sequential earthquakes tsunami. A 10‐storey reinforced concrete seismically designed Japanese vertical evacuation structure is adopted as case study the investigation. The first assessed earthquake tsunami nonlinear response history analyses: time this done in literature. resulting engineering demand parameters are then compared with those obtained when...

Abstract Long-extended-reach drilling (ERD) wells have become necessary to reach untapped resources. The successful implementation of an integrated multidisciplinary approach plan and execute multiple ERD is discussed in addition how the culture continuous improvement operational excellence between all parties resulted top quartile performance proved proper planning can push boundaries provide confidence safely drill even deeper. An was constructed using holistic offset well data analysis...

Dye adsorption onto the TiO2 nanoparticles thin film is typically slowest step in preparation of dye-sensitized solar cells. Potential assisted has previously shown to significantly reduce time from several hours minutes. However, it also reduced cell efficiency most cases and increased up 13 % compared classical method, by applying a constant potential for 60 min. In this work, pulsed carminic acid dye 33 adsorption, pulse 10 ms amplitude 0.5/-0.4 V 30 On other hand, single-frequency...

Summary Reinforced concrete shear wall buildings have shown, in statistical terms, an adequate performance past seismic events. However, a specific damage pattern was observed 2010 Chile earthquake some walls located the lower building stories, usually associated with high axial stresses, lack of transverse reinforcement, and vertical irregularity. Results show that nature this failure led to sudden degradation strength stiffness resulted very limited ductility. This research aims study...

Summary Reinforced concrete shear walls are used because they provide high lateral stiffness and resistance to extreme seismic loads. However, with the increase in building height, these have become slenderer hence responsible of carrying larger axial Because 2D/3D finite element inelastic models for still complex computationally demanding, simplified but accurate efficient fiber necessary quickly assess expected performance buildings. A classic model is modified herein produce objective...

After an earthquake, hospital emergency departments need to provide continuous health care services respond the eventual sudden increase in injured people. The service performance of department is influenced by internal factors, such as physical damage and staff availability, external increased patient arrival rate disruptions its supply chain. This research presents a quantification methodology for department. novelty proposed approach lies explicit integration inelastic structural...

Nonlinear dynamic analysis techniques have made significant progress in the last 20 years, providing powerful tools for assessing structural damage and potential building collapse mechanisms. The fact that several reinforced concrete shear wall residential buildings underwent severe walls at lower levels during 2010 Maule earthquake (Chile) presents a scientific opportunity to assess predictive quality of these techniques. objective this research is compare responses using two completely...

The stiffness matrix of a thin‐walled open‐section element including the effect shear strains due to warping is presented. Closed form expressions for coefficients are obtained case negligible uniform torsion stiffness; an iterative procedure, based on compatibilization scheme, presented when both and deformations considered. proposed can be used modeling core walls in multistory buildings suitable implementation computer program direct method. Two simple examples wall structures assess...

The paper presents a solution to the problem of obtaining effective length ratios needed for design stepped columns. formulation discrete model is presented, and numerical algorithm implemented solve it as matrix eigenvalue problem. method an alternative using tabulated results, which have been obtained from closed-form solutions number ideal boundary conditions, in most practical cases cumbersome almost always unpredictably inaccurate. A MATLAB coding provided, examples illustrating its use...

Abstract This article presents the evaluation and modeling of gelation-time data generated for four different water-based polymer systems used in oil industry as sealants to shut off undesired water production from hydrocarbon reservoirs. focuses primarily on measurement analysis gelation time provided by each system at temperature ranges. Each presented this exhibits a mechanism. Gelation was measured function temperature, activator concentration, crosslinker salinity percent mixing brine,...

Experimental analysis of the influence endogenous hormones on egg transport in oviduct requires groups animals which endocrine environment differs from that prevailing during early postovulatory period. In order to measure these animals, a substitute for must be introduced. Eggs cumulus obtained donor rabbits (Noyes, Adams & Walton, 1959) or radioactive microspheres (Harper, Bennett, Boursnell Rowson, 1960) have been used as substitutes, but both require surgical techniques and neither is...

Abstract Design, execution, and evaluation of cement operations using a new liquid-bead system helped achieve the necessary top for development wells in Brunei. Glass beads are common lightweight material used within oil industry to generate low-density slurry designs with competent compressive strength development. For Brunei offshore operations, dry poses many challenges, such as rig silo management, quality control blends, waste. A approach has been proposed produce slurries by adding...

Abstract Drilling and cementing across permeable, naturally fractured, depleted formations have become some of the most common challenges world. A major operator in Offshore Brunei was facing similar such formations. The primary objective job this difficult formation to isolate shallow hydrocarbon zones. Achieving desired top cement (TOC) without inducing losses design challenge. generally leads loss circulation scenarios. This makes subsequent operation more challenging. In order minimize...

Abstract Tailoring slurry designs using amorphous liquid silica base has been a success for Cementing Extended Reach Drilling (ERD) wells in Brunei development fields. The use of this unconventional density and design helped to achieve the necessary top cement required zonal isolation production string these wells. across depleted formations challenge drilling sector within oil industry. Isolation zones with competent slurries become necessity fields, especially where low Equivalent...