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Open research questions in Drilling and Well Engineering

129 gap statements mined from Drilling and Well Engineering papers in our 4.5M-paper local library, which holds 1,513 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The research highlights the need for repeated boreholes, logged operating and environmental conditions, inferential analysis, and independent validation. The study notes that the power supply voltage, power, rated rotational speed, and rated torque of the drill rig may affect the results.

    Preliminary Experimental Study on the Cross-Specimen Borehole Applicability of Identical Rock-Mass Characteristics Using Built-In Multi-Sensor MWD Monitoring for a Roof Bolter · 2026 · DOI

  • Heterogeneous uncertainty that is not fused. Uncertainty truncated to point estimates at module boundaries. Hard limits that are softened into penalties or checked only against nominal predictions.

    An Intelligent Integration Layer for Physics–AI Collaboration in Digital Drilling: Architecture, Interface Contracts, and Numerical Demonstration · 2026 · DOI

  • Conventional gels have a fixed crosslinked network prone to microcracking and volume loss. Prior self-healing gels have limitations in simultaneously achieving high mechanical strength, self-healing, and sufficient pressure-bearing capacity.

    Synergistic Effects of Mechanical Properties and Self-Healing in Borate-Based Hydrogen-Bond Dynamic Crosslinked Gels in High-Temperature Water-Based Drilling Fluids · 2026 · DOI

  • The limited plugging capability of water-based drilling fluids in unconventional reservoirs. The need for a high-temperature stable nano-plugging agent. The lack of effective methods for evaluating the plugging properties of nano-plugging agents.

    Preparation and Performance Evaluation of High-Temperature Polymer Nano-Plugging Agents for Water-Based Drilling Fluids Systems Applicable to Unconventional Reservoirs · 2025 · DOI

  • The lack of understanding of the long-term effectiveness of nano-silica gel as a water shut-off agent. The need for a comprehensive study on the long-term performance of nano-silica gel in fractured reservoirs. The gap in current research on the comparison of nano-silica gel to traditional PAM/PEI gel.

    Long-Term Investigation of Nano-Silica Gel for Water Shut-Off in Fractured Reservoirs · 2024 · DOI

  • Although seabed leaks have been observed in the North Sea, the mechanisms behind these leaks remain poorly understood.

    A criterion to identify leaking wells drilled through shallow gas in the North Sea · 2026 · DOI

  • However, most available studies focus on static rheology or hardened mechanical properties, while the dynamic displacement of fiber-reinforced cement slurries in narrow, inclined, and eccentric annuli remains poorly understood.

    Fiber-reinforced cement slurries for subsurface energy applications: A review of rheology, flow behavior, and mechanical performance · 2026 · DOI

  • While existing studies predominantly focus on cutting teeth thermal damage and bit life prediction, the dynamic evolution of rock fragmentation heat (RFH) and its coupling mechanism with lithological properties have not yet been fully elucidated.

    Experimental quantification of thermal signatures in rock fragmentation and a geothermal-assisted thermal-response method for real-time rock strength and temperature identification · 2026 · DOI

  • The geometry of the screen, particularly the weave pattern and layering, strongly influences both phases, yet its impact on the full-cycle filtration process remains insufficiently understood.

    Influence of weave geometry and layering on the progression of sand retention and permeability in standalone screens using resolved CFD-DEM · 2025 · DOI

  • While previous studies have focused on physicochemical and mechanical causes of wellbore instability, the effects of drill string vibrations—particularly cyclic impacts on the wellbore wall—remain underexplored.

    Effect of drill string lateral vibrations on wellbore stability and optimal mud pressure determination · 2025 · DOI

  • The study uses synthetic paraffin samples, which may not fully represent real-world deposits. The experiment is limited to a specific range of pressure amplitudes and frequencies (0.1-5.0 Hz). The study does not investigate the effects of other variables, such as temperature and wax content, on the mechanical destruction of paraffin deposits.

    Dynamics of the destruction of paraffin deposits in oil‒gas systems under cyclic pressure · 2026 · DOI

  • The literature lacks a comprehensive understanding of the effects of cyclic pressure on paraffin deposits. Prior studies have focused mainly on static conditions or deposit formation, with limited understanding of dynamic mechanical degradation.

    Dynamics of the destruction of paraffin deposits in oil‒gas systems under cyclic pressure · 2026 · DOI

  • The need to optimize wellbore trajectories and maximize the recovery efficiency of oil and gas resources.

    Numerical Simulation of Azimuthal Acoustic Logging-While-Drilling Responses for Geosteering Applications · 2026 · DOI

  • To date, no systematic analysis has been conducted on the acoustic logging responses of a typical heterogeneous formation setting. The relative positional relationship between the wellbore and the formation interface directly dominates the response characteristics of acoustic logging, but this has not been thoroughly studied.

    Numerical Simulation of Azimuthal Acoustic Logging-While-Drilling Responses for Geosteering Applications · 2026 · DOI

  • The lack of a methodology to assess technological readiness of coal mining operations for integration of automated systems. The need to adapt automated systems from the oil and gas industry to the coal industry.

    Integration of Artificial Intelligence solutions into automated control of the drilling processes: technology transfer from the oil and gas industry to the coal industry · 2026 · DOI

  • The lack of understanding of drillstring vibration in offshore high-inclination wells. The need for a dynamic model that considers drillstring-wellbore contact and bit-formation interaction. The requirement for a dynamic safety evaluation model to optimize drilling parameters.

    Optimization of Limit Drilling Parameters for High-Inclination Wells in the Bohai Sea Based on Drillstring Dynamics · 2026 · DOI

  • Previous studies were inconclusive regarding individual effects of the fluid shear viscosity vs elasticity, mainly because of the difficulty to separate and measure their impacts independently.

    A comparative study of the water based drilling fluid viscoelasticity versus shear viscosity effects on the filtration loss control · 2024 · DOI

  • The proposed model treats H-B parameter prediction over a wide temperature-pressure domain as a correction from ambient-condition rheology, - The predicted parameters are tied to the measured rheology of a given fluid, - Separating the contributions of individual components was beyond the scope of this study, - The study used a limited number of test…

    Prediction of Herschel–Bulkley Parameters for Water-Based Drilling Fluids Under Wide Temperature and Pressure Conditions Using Ambient-Condition Parameters · 2026 · DOI

  • Inorganic particles generally possess highly rigid structures with limited deformability - Micro- and nanoscale inorganic particles are prone to aggregation under high-salinity conditions - The plugging performance of single-component inorganic particles mainly relies on particle size…

    Organic–Inorganic Hybrid Gel Microspheres as a Plugging Agent for Ultra-High Temperature and High-Salinity Water-Based Drilling Fluids · 2026 · DOI

  • Further investigation of the long-term plugging effectiveness of HGP - Study of the effects of different particle sizes and concentrations of HGP on plugging performance - Research on the application of HGP in various drilling fluid…

    Organic–Inorganic Hybrid Gel Microspheres as a Plugging Agent for Ultra-High Temperature and High-Salinity Water-Based Drilling Fluids · 2026 · DOI

  • Future work requires multiple boreholes per rock type and multiple independently prepared specimens for inferential testing and power analysis, - A future analysis could normalize each borehole by a prespecified within-test reference segment and fit a hierarchical model, - Repeated boreholes, logged operating and environmental conditions, inferential analysis, and independent validation…

    Preliminary Experimental Study on the Cross-Specimen Borehole Applicability of Identical Rock-Mass Characteristics Using Built-In Multi-Sensor MWD Monitoring for a Roof Bolter · 2026 · DOI

  • Further research on the application of the IIL in real-world drilling operations - Investigation of the IIL's performance with different types of constraints and uncertainties - Extension of the IIL to other domains beyond drilling…

    An Intelligent Integration Layer for Physics–AI Collaboration in Digital Drilling: Architecture, Interface Contracts, and Numerical Demonstration · 2026 · DOI

  • The modeling and analysis can also help identify scenarios where staged circulation is insufficient and continuous circulation…

    Tripping and staging into geothermal wells while assuring thermal protection of downhole tools and sensors · 2026 · DOI

  • Applied on 61 wells in Maroon field, Iran No software mentioned No software mentioned combination of Deep ML and physical-based model will need complex programming Generalized features mentioned Hyperparameters data not clearly mentioned More models are needed to be added and compared Reasonable accuracy Hyperparameters data not clearly mentioned No software mentioned Applied on two wells (onshore and offshore) More…

    Machine learning-based prediction of standpipe pressure using operational parameters from offshore directional gas wells in the Nile Delta · 2026 · DOI

  • Further study on the effects of environmental temperature and internal-external pressure differences on drillstring deformation, - Research on the drillstring deformation beyond the elastic range, - Investigation of the wellbore with non-uniform…

    Optimization of Limit Drilling Parameters for High-Inclination Wells in the Bohai Sea Based on Drillstring Dynamics · 2026 · DOI

Most-cited papers in Drilling and Well Engineering

Most recent work

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Open questions raised by papers listed on this page include: (1) Although seabed leaks have been observed in the North Sea, the mechanisms behind these leaks remain poorly understood (“A criterion to identify leaking wells drilled through shallow gas in the North…”, 2026); (2) Most available studies focus on static rheology or hardened mechanical properties, while the dynamic displacement of fiber-reinforced cement slurries in narrow, inclined, and eccentric annuli remains poorly understood (“Fiber-reinforced cement slurries for subsurface energy applications: A review…”, 2026); (3) The relative positional relationship between the wellbore and the formation interface directly dominates the response characteristics of acoustic logging, but this has not been thoroughly studied (“Numerical Simulation of Azimuthal Acoustic Logging-While-Drilling Responses for…”, 2026); (4) The lack of a methodology to assess technological readiness of coal mining operations for integration of automated systems (“Integration of Artificial Intelligence solutions into automated control of the…”, 2026); (5) The lack of understanding of drillstring vibration in offshore high-inclination wells (“Optimization of Limit Drilling Parameters for High-Inclination Wells in the…”, 2026). 129 gap statements have been mined from Drilling and Well Engineering papers in our 4.5M-paper local library, which holds 1,513 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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