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In Norwegian drill and blast tunnelling, contracts stipulate collecting Measurement While Drilling (MWD) data from all drillholes. The MWD approach is an objective way of collecting, processing and visualising advance drilling data that have been successfully used in making face decisions for many years in Norwegian tunnelling. MWD data collection consists of equipping drill rigs with sensors recording...
In the mining industry, the ability to charge and blast a production borehole is fundamental. However, if rock mass conditions are challenging, with cavities, fracture zones or even unstable boreholes, the charging crew may fail to insert the required amount of explosives, resulting in bad fragmentation and significant production disturbances in the downstream process. Prior detailed knowledge of...
Measurement While Drilling (MWD) is a core technology for petroleum exploration. In this paper, a joint convolution code and pulse interval modulation, so called the trellis coded pulse interval modulation (TC-PIM) is proposed. The TC-PIM maximizes the minimal time distance between the modulation output sequences, and compared with the uncoded pulse interval modulation (PIM), it gets significant coding...
A numerical model and transmission characteristic analysis of DPSK (differential phase shift keying) pressure signals in mud channels is introduced. With the control logic analysis of the rotary valve mud telemetry, a logical control signal is built from a Gate function sequence according to the binary symbols of transmitted data and a phase-shift function is obtained by integrating the logical control...
Well logging, measurement while drilling, and seismic acquisition require custom power sources. These custom power sources are safely manufactured and tested for operations in subsurface environments. Currently at DynaTech, Ltd. Inc., battery assembly and testing are done manually. An automated battery testing data acquisition system has been developed to enhance the manufacturing process. The battery...
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