Mechanical

Vehicle predictive control based on the recursive subspace identification method
Vehicle active control is an important technology for vehicle safety and performance. Most vehicle control systems are based on models, and the effects of model-based controllers are more dependent on the model parameters. In order to improve the adaptability and the veracity of a control system, a new vehicle predictive control method is proposed. Based on the recursive optimized version of th...


Chemical studies of high molecular weight fractions of Nigerian bitumen
Chemical analysis of high molecular weight fractions of Nigerian bitumen was carried out to ascertain their characteristics which may assist in the development of the natural resource. Bitumen samples were fractionated by silica gel column chromatography into aromatics and nitrogen, sulphur, oxygen (NSO) compounds fractions. The fractions were analyzed for compound types using Fourier Transform...
Simulation of hydraulic fracturing in quasi-brittle shale formations using characterized cohesive layer: Stimulation controlling factors
Economic production from shale gas cannot be achieved by natural mechanisms alone; it requires technologies such as hydraulic fracturing in multiple stages along a horizontal wellbore. Developing numerical models for hydraulic fracturing is essential since a successful fracturing job in a shale formation cannot be generalized to another due to different shale characteristics, and restricted acc...


Investigation of the influence of stress shadows on horizontal hydraulic fractures from adjacent horizontal wells
Production efficiency from low permeability shale gas reservoirs requires techniques to optimize hydraulic fracture (HF) completions. This may be complicated by the presence of high horizontal in-situ stresses that result in horizontal HF, for example in parts of the Western Canadian Sedimentary Basin in northeastern British Columbia. One strategy involves the simultaneous or near simultaneous ...
The dynamics of hydraulic fracture water confined in nano-pores in shale reservoirs
Hydraulic fracturing treatments and horizontal well technology are central to the success of unconventional oil and gas development. In spite of this success, replicated over several thousand wells over diverse shale plays, hydraulic fracturing for shale wells remains poorly understood. This includes the poor recovery of hydraulic fracture water, the inability to explain the progressive increas...


Quantitative dynamic analysis of gas desorption contribution to production in shale gas reservoirs
Unlike in conventional gas reservoirs, gas in shale reservoirs is stored mainly as free gas and adsorbed gas, and a small amount of dissolved gas. Well production from shale gas reservoirs usually exhibits sharply decline trend in the early period of production and then turns to long-term stable production at a relatively low rate, for which gas desorption contribution has been considered as a ...
Characterizing and simulating the non-stationarity and non-linearity in unconventional oil reservoirs: Bakken application
This paper presents an innovative integrated methodology and working procedure for characterizing and simulating the strong non-linear and non-stationary features caused by changes in confined pressure–volume temperature (PVT) properties over time and the pressure-dependent permeability related to inherent pore-throat size, as well as the intervened multiple porous media created by multi-stag...

Efficient optimization framework for integrated placement of horizontal wells and hydraulic fracture stages in unconventional gas reservoirs
Rapid advances in horizontal well drilling and hydraulic fracturing have made these technologies standard development strategies in unconventional gas reservoirs. Further improvements in these practices by means of numerical optimization of wellbore locations and hydraulic fracture (HF) stages spacing can enhance shale gas reserves and increase revenue from the unconventional projects. In order...
Heat pumps are set to help reach targets
The climate and energy package is a set of binding legislation which aims to ensure that the European Union meets its ambitious climate and energy targets for 2020. Re Think Energy Europe, Climaveneta and Cavendish Engineers give their views on how air source heat pumps will help reach these targets.

When electric motors go wrong
There are many issues that can cause electric motors failure. However, there are some that crop up more often than the others. European Automation has compiled a list of the top five causes. All of them can be avoided with correct motor usage and maintenance as well as environmental management.
Staying safe when working with pumps
To the untrained eye, a pump appears to be far less dangerous than perilous machinery that you may find in the workplace. However, when managed incorrectly, pumps can often be just as dangerous. This article offers a few tips for those new to the industry and those who may have become complacent.

Measuring the role of product value in TCO
In calculating the total cost of ownership (TCO), the importance of product value cannot be overlooked. Fluid management solutions from ARO, a brand of Ingersoll Rand, has come up with a solution to help optimize costs and reduce downtime through the combination of the new ARO Controller and EXP Electronic Interface pumps.
Pump selection in iron ore mining
Iron-ore mining is an aggressive process and none more so than in northwestern Australia's Hope Downs 4 site. To ensure the slurry and water pumps are optimal for the mine's intense iron-ore extraction and wet-processing practices, a team from KSB relied on its engineering expertise and GIW's SLYSEL slurry pump selection program to offer a unique and beneficial situation for the customer.
Integrated variable speed control success
Masdar City, is a sustainable city under construction in Abu Dhabi. It is an ambitious planned city which will rely entirely on renewable energy with a sustainable, zero-carbon, zero-waste ecology. When pumps from another manufacturer proved unable to meet the demands of the project, Armstrong Fluid Technology stepped in to fulfil the requirement for pumps and controls for chilled water systems...
Custom engineering seals the deal at mill
When Bill Kuczynski from Casey Industrial noticed a large amount of oil leaking from a gearbox on a SAG mill at a client's copper milling facility, he knew it was time to recommend a permanent sealing solution. Stricter environmental laws and rising costs are changing the way customers view a leaking gearbox. Permanent bearing protection products, such as Inpro/Seal's Bearing Isolator, provide ...