Dynamic Wellbore Stability Analysis Under Tripping Operations

Meng, Meng; Zamanipour, Zahra; Miska, Stefan; Yu, Mengjiao; Ozbayoglu, Evren

doi:10.1007/s00603-019-01745-4

Cited by 35 publications

(15 citation statements)

References 40 publications

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“…As shown in Figure 1, the microgrooves are the crucial factor to experience low drag and fast speed for the sharks and birds. From the perspective of the urgent demand for decreasing pressure loss of fluid transport and the practical value of bionic theory, the bionic microstructure can be applied to the pipeline surface [23,24]. It provides a novel improving method for pipeline, and potential for anti-drag and anti-wear performance may be achieved by bionic drill pipe in the drilling engineering.…”

Section: Conventional Hydraulic Drag Reduction Methods Include Develomentioning

confidence: 99%

Investigation on drag reduction performance of pipeline with bioinspired microgrooved surface

Liu¹,

Ni²,

Wang³

et al. 2019

Preprint

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Novel surface morphology of pipeline with transverse microgrooves was proposed for reducing the pressure loss of fluid transport. Numerical simulation and experimental research efforts were undertaken to evaluate the drag reduction performance of bionic pipeline. The computational fluid dynamic calculation, using SST κ-ω turbulent model, shown that the “vortex cushioning effect” and “driving effect” produced by the vortexes in the microgrooves were the main reason for the drag reduction. The shear stress of the microgrooved surface was reduced significantly owing to the decline of the velocity gradient; then bionic pipeline achieved drag reduction effect in the pipe and concentric annulus flow. The primary and secondary order of effect on the drag reduction and optimal microgroove geometric parameters were obtained by orthogonal analysis method. The comparative experiments were conducted in a water tunnel, and a maximum drag reduction rate of 3.21% was achieved. The numerical simulation and experimental results were cross-checked and consistent with each other to verify that the utilization of bionic theory to reduce the pressure loss of fluid transport is feasible. Results can provide theoretical guidance for the energy saving of pipeline transportation.

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Section: Conventional Hydraulic Drag Reduction Methods Include Develomentioning

confidence: 99%

Investigation on drag reduction performance of pipeline with bioinspired microgrooved surface

Liu¹,

Ni²,

Wang³

et al. 2019

Preprint

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“…The properties of OBDF mainly focus on the aspects of high-temperature stability and suspension stability, which have not been thoroughly solved, thus resulting in a certain difference between reservoir protection technological capabilities and WBDF [16,17]. The stability problems caused by OBDF emulsification are rarely considered, the changes of wettability and capillary force caused by bubbling in OBDF are only mentioned in a few studies, the chemical changes caused by OBDFs entering reservoirs are rarely considered [18,19], and the formation of OBDF mud cake and particle size control have been mostly ignored.…”

Section: Introductionmentioning

confidence: 99%

Damage Mechanism of Oil-Based Drilling Fluid Flow in Seepage Channels for Fractured Tight Sandstone Gas Reservoirs

2019

Geofluids

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Oil-based drilling fluids (OBDFs) have a strong wellbore stabilization effect, but little attention has been paid to the formation damage caused by oil-based drilling fluids based on traditional knowledge, which is a problem that must be solved prior to the application of oil-based drilling fluid. For ultradeep fractured tight sandstone gas reservoirs, the reservoir damage caused by oil-based drilling fluids is worthy of additional research. In this paper, the potential damage factors of oil-based drilling fluids and fractured tight sandstone formations are analyzed theoretically and experimentally. The damage mechanism of oil-based drilling fluids for fractured tight sandstone gas reservoirs is analyzed based on the characteristics of multiphase fluids in seepage channels, the physical and chemical changes of rocks, and the rheological stability of oil-based drilling fluids. Based on the damage mechanism of oil-based drilling fluids, the key problems that must be solved during the damage control of oil-based drilling fluids are analyzed, a detailed description of formation damage characteristics is made, and how to accurately and rapidly form plugging zones is addressed. This research on damage control can provide a reference for solving the damage problems caused by oil-based drilling fluids in fractured tight sandstone gas reservoirs.

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“…According to statistics, 90% of the borehole instability occurs in mud shale formation . The influence factors of shale borehole stability are very complex, which can be attributed to three aspects: physicochemical factors, mechanical factors, and engineering factors . At present, a lot of researches have performed relatively adequate research on physicochemical factors and mechanical factors …”

Section: Introductionmentioning

confidence: 99%

“…The research method developed from linear elasticity to poroelasticity, from elastic analysis to plastic analysis, and from single field analysis to multi‐field coupling analysis . The solving method developed from analytical, semi‐analytical methods to numerical simulation methods including finite difference, finite element, boundary element, and discrete element, etc . Both isotropic and anisotropic of shale rock were considered.…”

Section: Introductionmentioning

confidence: 99%

“…Both isotropic and anisotropic of shale rock were considered. Based on the basic theories established a long time before, researches now focus on borehole stability under dynamic loading conditions, and the influence of anisotropic strata, including anisotropy of sedimentary tectonics, strength parameters, and elastic parameters . Using these contributions, more accurate predictions were achieved.…”

Section: Introductionmentioning

confidence: 99%

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Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

Sun

Meng

Dai

et al. 2019

Energy Science & Engineering

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Wellbore instability happens mostly in the shale formation. Early researches have studied thoroughly on the physicochemical and mechanical mechanism that causes instability. However, only a few works have considered the influence of field drilling operations, such as drill pipe rotation. In this paper, a true triaxial cell is used to simulate the downhole field situations, and a drill pipe rotation device is innovatively designed and implemented into the true triaxial cell. Using this facility, the influence of drill pipe rotation on shale instability has been performed. Different rotation speed, weight on bit, drilling fluid pressure, and microcracks on borehole have been considered. The enlargement of the wellbore is quantitatively plotted and compared.Results show that the drill pipe rotation contributes to a more enlargement of the wellbore, and a higher rotation speed causes a more severe collapse. The drill string weight on bit also contributes to the enlargement of the wellbore, with a larger weight on bit induces a larger diameter of the collapsed wellbore. Compared with the rotation speed and weight on bit, the influence of drilling fluid density is relatively less significant. However, the influence of microcracks caused by hitting of drilling tools is profound. For a cracked shale formation, the wellbore diameter can be enlarged for more than 40%. Then, the variation of borehole collapse with time and depth under drill pipe rotation influence is analyzed. In all of these four factors, the significant sequence is microcracks > weight on bit > rotation speed > drilling fluid pressure.In all the collapse phenomena, the collapse is more severe in the minimum horizontal stress direction. This is explained by the analysis of the stress distribution in the whole circumferential angle (360°) of the wellbore. Overall, this work fills the gap of the influence of drilling operations on wellbore instability. K E Y W O R D Sborehole enlargement, drill pipe rotation, true triaxial cell, wellbore instability 2896 | SUN et al.

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Dynamic Wellbore Stability Analysis Under Tripping Operations

Cited by 35 publications

References 40 publications

Investigation on drag reduction performance of pipeline with bioinspired microgrooved surface

Investigation on drag reduction performance of pipeline with bioinspired microgrooved surface

Damage Mechanism of Oil-Based Drilling Fluid Flow in Seepage Channels for Fractured Tight Sandstone Gas Reservoirs

Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

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