Advancements in Drillstring Dynamics Modeling Deliver Performance Step-Change, Saudi Arabia

Reda, Saeed Al; Juwaiher, Hussain Ali; Feroze, Nouman; Karuppiah, Venki; Wu, Xianping; Partin, Uyen Tran

doi:10.2118/144360-ms

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…In previous operations, the transient dynamic modeling with the detailed bit model has been utilized by the service company to identify drilling problems and to quantify the changes in BHA configuration and optimize the drilling parameters, prior to commencing drilling operation [1][2][3][4][5][6][7][8][9] . It has the proven capability to help operators improve drilling efficiency and log data quality.…”

Section: Introductionmentioning

confidence: 99%

Defining Design and Optimization Method: Dynamic Simulation Model Produces Integrated BHA Solutions for Efficient Wellbore Delivery

Chen

Shen

Harmer

et al. 2015

SPE/IADC Drilling Conference and Exhibition

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In difficult drilling environments, a critical aspect for success is BHA design optimization in the pre-job phase. In previous operations, modeling and run simulations have proven valuable at helping operators improve drilling efficiency (reduce NPT; increase footage/day), produce high-quality log data and properly position the wellbore to increase contact with the reservoir. To further improve modeling accuracy/reliability, a dynamic modeling system was used for BHA analysis. The FEA (finite element analysis)-based system enables engineers to leverage the team's combined expertise and full suite of drilling tools to optimize a BHA for a specific application.Four criteria are used to evaluate BHA performance during simulations: stability; robustness/reliability; measurement quality; steerability. Simulations are run to determine each configuration's potential for axial, lateral/torsional vibration and identify the root cause and dominant mode. To ensure maximum BHA robustness, the loading on BHA components is mapped/rated allowing refinements to increase BHA service life and reduce the potential for costly NPT. Simulations are run to observe the potential for MWD/LWD tool deformation and sag angle to determine the adverse effect sensor motion could have on measurement quality. To mitigate steerability issues, build/walk tendencies are simulated to determine how the BHA will respond to steering command from RSS/PDM.A wide-range of factors can be considered in this procedure. Various cutting structures and steering tools are analyzed and modified as required. The type and location of BHA components are also modeled and re-positioned for optimization purposes. Various drilling scenarios and operating parameters are fed into the system including RPM/WOB, sliding/rotating time, back-reaming and rotating off bottom. Formation characteristics including rock types, friction factor, heterogeneity/homogeneity, degree/amount of interbedding can all be varied to investigate the BHA's corresponding directional implications and vibrational response.All potential BHA designs are evaluated under a set of pre-defined drilling scenarios. A comparative analysis is performed to investigate BHA responses against each specific criterion to identify the optimum BHA configuration. Operating conditions are analyzed for each BHA and an optimal parameter window of minimized BHA shock and vibration is generated with a range of RPM/WOB recommendations. The authors will present several conclusive case studies that document the method's effectiveness and cost reducing capabilities.

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Section: Introductionmentioning

confidence: 99%

Defining Design and Optimization Method: Dynamic Simulation Model Produces Integrated BHA Solutions for Efficient Wellbore Delivery

Chen

Shen

Harmer

et al. 2015

SPE/IADC Drilling Conference and Exhibition

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Advanced FEA Modeling Delivers Solution for Designing a Dual Hole Opening BHA for a Single Directional Run

Najmi

Soh

Nair

et al. 2015

SPE/IADC Drilling Conference and Exhibition

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Drilling the 8½” x 10-5/8″ x 12¼” S-shaped wellbore through soft unconsolidated formation and highly compartmentalized reservoir offshore East Malaysia is exceptionally challenging. Previously, the operator has drilled a similar hole opening section in this marginal field with two separate runs. The directional requirements combined with low WOB took the operator three days to drill and open the 640m section. For the new drilling campaign, the reservoir objectives were to drill deeper and to appraise the well, with an option to complete and produce the gas reservoirs if there are any discoveries. The operator requested the hole be drilled with hole enlargement while drilling (HEWD) tools in a single run, with real-time logging tools. This technique would eliminate the requirement for extra 8½” pilot hole thus significantly reduce rig-days. Designing a robust and durable BHA for the 1370m long directional run demands intricate planning. To ensure the three cutting structures would synchronize and work in harmony, a pre-job FEA-based modeling system was used to investigate the dynamic drilling behavior of the BHA. The results of simulations from the initial BHA predicted very high vibrations which could potentially result in tool damage. A BHA optimization analysis was then conducted to enhance the BHA design to eliminate vibration issues. The simulation results of the optimized BHA design exhibited measurable reduction in vibration levels. The operator implemented the recommended BHA and a total of 1371m was successfully drilled and opened in one run, in just four days. All directional requirements were met and a good set of survey and log data was transmitted up the well without issues. Compared with the traditional two run approach, the single run yielded a 25% time savings to the operator. No vibrations were recorded and the BHA was pulled at section TD with no significant wear on the three cutting structures. There were no issues running casing, which implies good borehole quality.

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Mitigating Twist-Offs While Drilling with the Help of BHA Dynamics Software

Rivas

Ramírez

Al-Zahrani

et al. 2021

SPE/IADC Middle East Drilling Technology Conference and Exhibition

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One of the major challenges the Oil and Gas Industry faces nowadays during drilling operations is the twist-offs on Bottom Hole Assembly (BHA) components such as Drilling Jars, Shock Tools, Mud Motors, Roller Reamers, Stabilizers, Drill Collars, PBLs, Heavy Weight Drill Pipe (HWDP), Drill Pipe (DP), etc. To overcome this challenge, an initiative was proposed by performing a study based on twist-offs experienced on BHA components while drilling operations and recommendations are provided to reduce and eliminate twist-offs related to drilling with suboptimal drilling parameters. The statistical data for the twist-off events was collected coming from Daily Drilling Reports, and the analysis was limited to all wells which presented twist-offs on the drillstring and BHA components. Three examples of twist-offs due to drilling with erratic torque are discussed as well as a successful example of drilling parameters optimization. The three examples which presented drillstring and BHA twist-offs were analyzed using available BHA Dynamics and vibrations software and it was discovered that the parameters utilized (operational RPM) fell within the critical zone shearing force peaks (resonance vibrations). The components with the most twist-offs were identified. The hole size where we have the most twist-offs were also identified, which will help in focusing on these areas for the recommendations provided. This analysis will help Drilling Engineers and Foremen to foresee vibration dysfunctions and act accordingly by the use of available BHA Dynamics software in order to optimize drilling parameters before and during drilling. By drilling within a safe operating RPM window (away from resonant RPM), there will be reduction in the number of twist-offs and associated lost time.

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Advancements in Drillstring Dynamics Modeling Deliver Performance Step-Change, Saudi Arabia

Cited by 3 publications

References 13 publications

Defining Design and Optimization Method: Dynamic Simulation Model Produces Integrated BHA Solutions for Efficient Wellbore Delivery

Defining Design and Optimization Method: Dynamic Simulation Model Produces Integrated BHA Solutions for Efficient Wellbore Delivery

Advanced FEA Modeling Delivers Solution for Designing a Dual Hole Opening BHA for a Single Directional Run

Mitigating Twist-Offs While Drilling with the Help of BHA Dynamics Software

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