Design and flow field analysis of impregnated diamond bit for seafloor drill in soft-hard interlaced strata

Wang, Jialiang; Chen, Chen; Qian, Dilei; Peng, Fenfei; Yu, Mengfei; Sun, Yang; Peng, Deping

doi:10.1186/s44147-022-00135-y

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…Cao et al analyzed the characteristics of two-phase flow field of a diamond bit for KM closed coring drilling tools with the method of numerical simulation, and put forward design suggestions for two-phase flow channel of the diamond bit [15]. Wang et al designed a set of undersea diamond coring bits, which can effectively protect the rock core samples, and analyzed flow characteristics of drilling fluid flowing in boreholes using Fluent software [16]. In literature [17], flow field distributions of a PDC bit were studied using finite element simulation method, and a PDC bit design method was proposed for drilling tight oil reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Flow field simulation of a hydrogeological exploration drill bit for switching coring drilling and non-coring drilling

Shi,

2023

Preprint

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Drilling is one of the most commonly techniques in hydrogeological exploration, which is employed to obtain rock samples and build boreholes. During conventional drilling, it needs to raise all drilling tools in the borehole, when switching coring drilling and non-coring drilling, which will cause large auxiliary operation time consumption and poor drilling efficiency. According to the structure of wireline coring tools, a large diameter modular drill bit is designed to switch coring drilling and non-coring drilling without lifting the whole drilling tools. In the Comsol simulation environment, a simulation model of the modular bit is constructed using computational fluid dynamics (CFD) method. Drilling fluid velocity and pressure characteristics flowing through the modular bit were studied, with different values of flow rate at the bit inlet, clearance between external bit and internal bit for coring drilling, and layout of nozzles at the bottom of the internal bit for non-coring drilling setting respectively. According to the analysis results, velocities of drilling fluid flowing upward at the clearance between external bit and borehole wall increases linearly, and the pressure at bit inlet increases in parabola, with the flow rate increasing. With the same input flow rate, similar velocities and lower pressure loss can be obtained in the non-coring drilling compared with the coring bit, and thus drilling cuttings can be removed effectively even if there are more drilling cuttings produced in non-coring drilling than in coring drilling, when a borehole is drilled with the same diameter. When the outside diameter of the modular bit is 216mm, the recommended clearance value is 9mm or 10mm in order to obtain lower pressure loss and larger diameter core. To generate low pressure loss and ensure bit strength, the layout with 4 nozzles on the internal non-coring bit is recommended. The modular bit enables fast switching coring drilling and non-coring drilling without raising drilling tools, and the simulation model can be used for drilling parameters selection and drill bits optimization.

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Section: Introductionmentioning

confidence: 99%

Flow field simulation of a hydrogeological exploration drill bit for switching coring drilling and non-coring drilling

Shi,

2023

Preprint

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Flow Field Simulation of a Hydrogeological Exploration Drill Bit for Switching between Coring Drilling and Non-Coring Drilling

Shi,

2024

Applied Sciences

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Drilling is one of the most commonly used techniques in hydrogeological exploration and is employed to obtain rock samples and create boreholes. During conventional drilling, it is necessary to raise all the drilling tools in the borehole when switching between coring drilling and non-coring drilling, which causes large auxiliary operation time consumption and poor drilling efficiency. Based on the structure of wireline coring tools, a large diameter modular drill bit was designed to switch between coring drilling and non-coring drilling without lifting the whole set of drilling tools. In the COMSOL simulation environment, a simulation model of the modular bit was constructed. Drilling fluid velocity and pressure characteristics flowing through the modular bit were studied. According to the analysis results, with the same input flow rate, similar velocities and lower pressure loss can be obtained in non-coring drilling as with the coring bit, and thus drilling cuttings can be removed effectively even if there are more cuttings produced in non-coring drilling than in coring drilling for a borehole drilled at the same diameter. When the outside diameter of the modular bit is 216 mm, the recommended clearance value is 9 mm or 10 mm in order to obtain lower pressure loss and larger diameter core. To generate low pressure loss and ensure bit strength, a layout with four nozzles on the internal non-coring bit is recommended. The modular bit enables fast switching between coring drilling and non-coring drilling without raising the drilling tools. The simulation model can be used for drilling parameter selection and drill bit optimization.

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Multi-Objective Optimization Study of Annular Fluid Flow Structure in Cordless Core Drilling Tools

Zhu,

Huang,

Zhao

et al. 2024

Applied Sciences

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Traditional drilling methods often face difficulty meeting the demand for efficient and accurate coring under complex geological conditions. Cordless coring is an advanced technology that uses hydraulic lifting to carry out coring, which can achieve automation and automated and intelligent drilling operations. In this research, a new type of hydraulic lifting cordless coring drilling tool is designed. Moreover, a numerical simulation model of the fluid flow in the annulus between the spearhead and spool of the cordless coring drilling tool was established. Orthogonal simulation tests are carried out, and according to the orthogonal test data, a numerical prediction model of the spool annulus fluid field based on the Backpropagation Neural Network (BP neural network) is established. The prediction of the flow rate of the drilling fluid and the spool back-pressure ratio was obtained when the structural parameters of the spearhead and the spool annulus were different. A multi-objective optimization of the annulus flow structure of the cordless core drilling tool has been carried out. The optimization objectives include deciding the back pressure ratio of the spool overcoming the spring and the flow rate of the drilling fluid. According to the established nonlinear optimization model and based on the improved Non-dominated Sorting Genetic Algorithm II (NSGA-II) multi-objective optimization algorithm, it is verified that the convergence speed and diversity of the improved algorithm are better than those before the improvement. The simulation and experimental validation are carried out. It is verified that the flow rate of drilling fluid increased by 33.56% after optimization, and the force ratio was lowered by 5.825%. Finally, based on the simulation and optimization results, the φ96 cordless core drilling tool was manufactured on a trial basis, and on-site concrete drilling, coring, and hydraulic lifting operations were conducted for smooth coring and lifting. This study could provide an important scientific basis and technical support for the application and development of hydraulic lifting cordless coring technology.

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Design and flow field analysis of impregnated diamond bit for seafloor drill in soft-hard interlaced strata

Cited by 3 publications

References 26 publications

Flow field simulation of a hydrogeological exploration drill bit for switching coring drilling and non-coring drilling

Flow field simulation of a hydrogeological exploration drill bit for switching coring drilling and non-coring drilling

Flow Field Simulation of a Hydrogeological Exploration Drill Bit for Switching between Coring Drilling and Non-Coring Drilling

Multi-Objective Optimization Study of Annular Fluid Flow Structure in Cordless Core Drilling Tools

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