Riserless Reelwell Drilling Method to Address Many Deepwater Drilling Challenges

Mirrajabi, Mehdi; Nergaard, Arnfinn; Hole, Ove; Vestavik, Ola Michael

doi:10.2118/126148-ms

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…Since the drilling fluid carrying cuttings is returned from the inner pipe of the drill pipe, the drilling fluid can avoid damage to the oil and gas formation. Reel Well drilling technology [5][6] was developed in 2004. Statoil and the Scientific Research Council of Norway carried out theoretical research on the technology, research and testing of supporting equipment, and started field feasibility research on the technology in 2005.…”

Section: Introductionmentioning

confidence: 99%

Structural Optimization Design of Modular Double Drill Pipe

Wang¹,

Guo²

2022

AJST

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Aiming at many drilling blocks with pore pressure coefficient ≦1.05 in China (shale gas surface layers in Tarim Basin and Sichuan Basin, depletion of reservoirs and gas reservoirs in developed oil and gas fields in China), the narrow window of drilling fluid density in such blocks will directly lead to wellbore instability, difficulty in carrying rock debris and serious formation losses. In order to control the fluctuation range of formation pressure, on the basis of conventional managed pressure drilling technology, gas lift positive circulation drilling technology and Marine double gradient drilling technology are integrated to form gas lift positive circulation drilling technology. The double drill pipe is one of the key equipment to realize the above drilling technology. Under this background, a double drill pipe for gas lift positive circulation drilling technology is designed. In this paper, the key equipment of gas lift positive circulation drilling technology is analyzed and its structure is optimized.

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Section: Introductionmentioning

confidence: 99%

Structural Optimization Design of Modular Double Drill Pipe

Wang¹,

Guo²

2022

AJST

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“…In field practice, a shallow horizontal trial well was completed onshore in Alberta, Canada with dual-channel drillpipes [15]. Improvements are also expected in offshore drilling performance with dual-channel drillpipes by eliminating the need for the long riser [16][17][18]. Theoretical studies were also performed on the flow behavior and well cleaning efficiency of dual-channel drilling.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Extended-Reach Limit Prediction Model of Horizontal Drilling with Dual-Channel Drillpipes

Tan

Zhang

2021

Energies

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Extended-reach horizontal wells are critical for the development of unconventional reservoirs. Dual-channel drill pipe drilling has a great advantage in improving the horizontal section length, while the research on its mechanical extended-reach limit prediction model is insufficient. In this paper, the torque and drag model is built considering the additional axial force of the sliding piston on the dual-channel drillpipe. Based on the torque and drag model, the mechanical extended-reach limit model for dual-channel drilling is established. A case study including a comparison to the conventional drilling method and sensitivity analysis is conducted. The result shows that under the same conditions, the mechanical extended-reach limit of the dual-channel drilling method is 10,592.2 m, while it is 9030.6 m of the conventional drilling method. The dual-channel drilling method achieves a further mechanical extended-reach limit than the conventional drilling method. To improve the mechanical extended-reach limit of dual-channel drilling, a higher back pressure on the sliding piston, a deeper measured depth of the sliding piston, a higher density of the passive drilling fluid, a smaller outer diameter of the outer pipe, a lower weight on bit and rate of penetration should be adopted. The work in this paper completes the extended-reach limit theory of dual-channel drilling, providing a guide for better use in unconventional reservoir development.

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“…This new type of reverse circulation pressure control drilling technology has great potential and advantages over conventional drilling methods in the accurate control of bottom hole pressure, wellbore cleaning, drilling pressure application, large displacement drilling, ultra-deep well drilling and obstacle drilling. At the same time, because the drilling fluid circulates inside the drill pipe, the working radius and drilling depth of the drilling ship is extremely larger than conventional offshore drilling [1][2][3]. The double-drill horizontal drilling system is a closed-loop circulating flow system.…”

Section: Introductionmentioning

confidence: 99%

Erosion Law of Inner Drill Pipe in Reelwell Reverse Circulation Directional Drilling

Huang²,

Gao

et al. 2019

MSF

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In the process of ReelWell reverse circulation directional drilling, the drilling fluid returns through the inner drill pipe, and the debris particles continuously eroded and wear the drill pipe in the inclined section, which easily causes the failure of the inner drill pipe erosion. Analysis, through the Fluent software to simulate the flow field in the inner drill pipe, to study the impact of different drilling fluid displacement, different mechanical drilling speed, different cuttings particle size on the drill pipe erosion. The results show that: (1) The larger the drilling fluid displacement, the higher the return velocity of the drilling fluid, the greater the number of cuttings, the larger the maximum erosion rate of the curved pipe section, and the larger the erosion area; (2) The higher the drilling rate High, the higher the concentration of cuttings particles, the higher the probability of particles hitting the pipe wall, the greater the maximum erosion rate of the curved pipe section, and the larger the erosion area. When the mechanical drilling rate is higher than 10m/h, the maximum erosion rate increases significantly; (3) the smaller the cuttings particle size, the larger the number of cuttings particles, and the greater the maximum erosion rate of the curved pipe section. It is recommended that the drilling fluid displacement and the mechanical drilling rate should not be too large during the reverse circulation drilling process. At the same time, the cuttings particle size should be controlled, the drilling tool management should be strengthened, and the reasonable use standard after the drill pipe erosion is established. The research results have a certain guiding significance for revealing the failure of the inner drill pipe erosion in ReelWell reverse circulation directional drilling and the scientific use of the wear drill pipe.

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Riserless Reelwell Drilling Method to Address Many Deepwater Drilling Challenges

Cited by 10 publications

References 3 publications

Structural Optimization Design of Modular Double Drill Pipe

Structural Optimization Design of Modular Double Drill Pipe

Study on the Mechanical Extended-Reach Limit Prediction Model of Horizontal Drilling with Dual-Channel Drillpipes

Erosion Law of Inner Drill Pipe in Reelwell Reverse Circulation Directional Drilling

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