Juniper Publishers-Mining Science Technology

  Insights in Mining Science & Technology Abstract Rubber belt conveyors are an integral part of many mining and bulk haulage applications. The belts are designed to wear in-service and thus need to be replaced periodically. Currently, belt life management is done by measuring the thickness reduction and estimating remaining life once the belt has been operating for some time. This approach is not applicable for new conveyor belts. In this paper we present a process for building a model, and results thereof, to predict the life of new conveyor-belts based on a variety of design and operating parameters. The work analyses wear readings from operating conveyor belts and constructs linear regression models for predicting the wear-rate of out-of-set conveyors. Ultrasonic readings from 165 iron-ore rubber, steel-cored conveyor belts, installed in 95 conveyors were modelled against various belt and conveyor features. Nine linear regression models and/or modelling approa...

  Insights in Mining Science & Technology Abstract Formation damage in hydrocarbon reservoirs around the wellbore is inevitable and can happen from the earliest stages of drilling to the latest hydrocarbon recovery stages by tertiary enhanced recovery methods. Numerical simulations of production behavior around wellbore perforation in single-phase and two-phase states have been conducted by the CFD method to investigate the effect of perforation geometry on formation damage. Moreover, formation damage due to drilling mud penetration into the perforations by dispersion mechanism has also been analyzed. The results of the simulation were validated in good accordance with the published data. Based on simulation results, although perforations enhance the drilling mud penetration damage, especially for perforation lengths up to 20cm, they can effectively reduce perforation skin if they become adequately cleaned. Perforation density, length, and diameter have the most pr...