Dr Determining the Optimum Descaling Requirement of Utilising Multiple Flat Fan Nozzles in cleaning Paraffin Inflicted Petroleum Production Tubing
Keywords:Scale removal, multiple nozzles, high-pressure water spray, flat-fan nozzle
Despite the recent detailed results obtained from numerous researches in the utilisation of hydraulic descaling techniques that elaborates the erosion behaviour of multiple high-pressure flat fan nozzles in descaling petroleum production tubing’s embedded with different types and shapes of scale deposits. Through the adoption of both hydrodynamic connected parameters like injection pressure and numbers of nozzles and also the non-hydro connected parameters like stand-off distance, nozzles arrangements and chamber pressure. That lead to achieving the main research goal of enhancing the removal capacity via the permutation and combination of the aforementioned descaling parameter. Theirs still need of determining the best combination of descaling parameters required for effectively and efficient descaling of each type of scale deposit. Thereby, developing an operational guide for removing each scale type and shape when utilising multiple high-pressure nozzles and other descaling parameters will be very valuable for the petroleum production technologist handling the flow assurance of a scale inflicted well. This novel experimental scale removal technique utilizes multiple high-pressure spray of up to 10MPa and low flow rate of 12 l/m from multiple flat fan nozzles of different arrangement and stand-off distance. That is housed in a constructed simulated production tubing chamber with vacuum and compression capacities to remove constructed wax deposit (paraffin) of different shapes signifying different growth stages of paraffin in production tubing.?Generally, the performance of each or combination of the descaling parameters during the experiment depends on the shape and type of the scale deposit in question, most especially the chamber air concertation and nozzles arrangements. Also, the amount removed of all the respective scale deposit was found to increase with increase in injection pressure and reduction in number of nozzles. Likewise, the effect of stand-off distance toward the erosion rate of all the respective descaling candidates was found to reduce with increase in downhole jetting position, even though could be compensated with the right choice of nozzles arrangement.
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