Abstract
Drill Bits optimization is the key factor to improve the overall drilling efficiency and therefore, reduce the cost and the non-productive time. For this, analysis of the offset field data, modelling before drilling and optimization the drilling parameters are highly required to enhance the drilling efficiency. In this paper, 8 ½” hole of three drilled wells is analysed for the rate of penetration (ROP), drilling cost per meter and the drilling duration of each drill bit. The analysis has shown that the variation in drilling efficiency was due to some factor such as, the type and features of the used drill bit, the bottom hole assembly type and the drilling parameters. ROP model (multiple regression equation) is developed by using a reference well’s drilling parameters. The drilling parameters that have been used to develop the ROP model are weight on bit (WOB), revolution per minute (RPM) of the drill string, the drilling torque (TRQ), jet impact force (JIF) of the drill bit and the unconfined compressive strength (UCS) of the formation. Parametric sensitivity study has been carried out using this model to interpret the drilling parameters that have the greatest impact on ROP. Finally, drill bits’ with the highest performance are recommended to be used based on analysis of the offset wells and ROP model “multiple regression equation” has been approached to predict the ROP values before drilling to be used in optimization of drill bits’ performance in the forthcoming drilled wells.
Highlights
The objective of the drilling operation is to safely execute the drilling plan at optimum performance with the minimum drilling cost and time
Multiple regression workflow has been carried out on 8 1⁄2” hole section of the reference well, the parameters used in multiple regression analysis are in the form of weight on bit (WOB), revolution per minute (RPM), torque, jet impact force (JIF) and the unconfined compressive strength (UCS) of the drilled formation, together with the observation factor rate of penetration (ROP)
ROP values and the length of the drilled interval per each drill bit are taken into consideration in the analysis study, shown in table 1
Summary
The objective of the drilling operation is to safely execute the drilling plan at optimum performance with the minimum drilling cost and time. The operators are continuously looking for techniques that maximize operation efficiency and minimize the time to drill each section (1; 2). Optimizing the drilling efficiency could only be achieved through three distinct stages; planning and modeling before drilling, monitoring during drilling and analysis the drill bits performance after drilling (3). The challenges in drilling 8 1⁄2” hole section are a lot; the high unconfined compressive strength of conglomerate formation, the torque fluctuation, the high vibrations that were being generated when PDC bits had been used and the high bit wear in a short time. In addition to the previously mentioned challenges, the operator was suffering from the high cost per every drilled meter and the time consumed in drilling that section
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