Some features of the design and application of innovative downhole drilling devices
DOI:
https://doi.org/10.33271/crpnmu/86.041Keywords:
core sampler, core, removable core barrel, hydraulic transport, hydraulic percussion device, core self-jammingAbstract
Purpose. Rationale for the design features of a downhole core sampler and assessment of the potential use of hydraulic impact devices to improve the efficiency of core recovery and transportation.
Research methodology. The methodology involves a structural and functional analysis of the PVP - 2 core sampler using analytical relationships and bench-test results to assess rock-breaking processes, core formation, and hydraulic core transportation. The potential use of a hydraulic impact device to prevent jamming of the core sampler and core self-jamming is also considered.
Research results. It was established that the efficiency of the PVP - 2 sampler is determined by the interaction of its rock-breaking, core-receiving and circulation components. Hydraulic transport of the core barrel is affected by transport channel geometry and core material density. The role of the centralizer assembly and sealing elements in stabilizing the position of the core barrel has been determined. The use of a hydraulic percussion device contributes to the intensification of rock destruction and reduces the risk of sampler jamming and core self-jamming.
Originality. The methods for comprehensive analysis of bottomhole samplers have been improved by accounting for the geometric parameters of the transport channel and the physical properties of the core material. A relationship governing the variation in hydraulic transport velocity vst as a function of the channel geometric parameter fsc and core material density ρc has been established: a decrease in fsc from 0.807 to 0.571 results in an increase in vst from approximately 0.19 to 0.62 m/s, while an increase in ρc within the range of 1800–3200 kg/m3 leads to a further increase in vst. The scientific principles concerning the application of hydraulic impact devices to intensify rock breakage and reduce the risk of sampler and core jamming have been further developed.
Practical implications. The obtained results can be used to substantiate the operating parameters of the PVP - 2 core sampler, improve the reliability of core recovery and hydraulic core transport, and assess the feasibility of using hydraulic percussion devices to reduce the risk of jamming.
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