A discussion about the method to study the effect of ambient pressure on hydraulic jetting

Li, Jingbin; Li, Gensheng; Huang, Zhongwei; Song, Xianzhi; He, Zhenguo; Zhang, Shikun

doi:10.1016/j.petrol.2016.10.043

Cited by 17 publications

(5 citation statements)

References 17 publications

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“…where k is the hydraulic conductivity tensor and g is the gravity acceleration vector. The conditions of a porous medium are defined with the simultaneous equations of Formulas (5) and (6). By integrating the equation set and the boundary conditions, the equilibrium and the continuity equations can be approximately expressed as the finite element equation set with interpolation function introduced in the finite element discretization.…”

Section: Geofluidsmentioning

confidence: 99%

“…In this paper, radial borehole fracturing technology means fracturing based on the existing radial boreholes drilling by hydraulic jetting technology. Based on the mature technology of hydraulic jetting [6][7][8][9], preliminary conclusions have been obtained in the research on the radial borehole fracturing at a certain level, which indicates that this technology can change the inherent morphology of fracture and effectively improve the effect of reservoir stimulation [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

2019

Geofluids

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The radial borehole fracturing technology has been applied in a certain number of oilfields with good results being achieved. However, the morphology and variation of fracture still require further study. In this paper, the reservoir model based on formation fluid-solid coupling equation is established with the extended finite element method (XFEM) in ABAQUS, and the fracture morphologies in the single-radial borehole, vertical multiradial borehole, and horizontal multiradial borehole are simulated and analyzed with criteria of maximum principal stress and maximum energy release rate as the damage mechanism. Moreover, the accuracy of numerical simulation results is verified with the large-scale true 3D physical simulation experiment. The results show that the induced stress field along the radial borehole during fracturing is the root cause of fracture directional propagation along the radial borehole whose effective guidance distance reaches 40 m. The vertical multiradial borehole can effectively enhance fracture directional propagation and is capable of reducing fracture initiation pressure. In the horizontal multiradial borehole, the major fracture propagating along each radial borehole is formed in the remote-borehole area, and the secondary fracture connecting the neighboring radial boreholes is formed in the near-borehole zone. Coordination of major and secondary fractures can effectively increase the drainage area and reduce the flow resistance in the near-borehole zone. Based on the research on fracture morphology of multiradial borehole fracturing, the scheme of radial borehole arrangement is optimized and verified through numerical simulation of deliverability. The final optimum borehole arrangement scheme is the intersectional angle of 45°between four orthogonal radial boreholes and horizontal maximum principal stress.

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Section: Geofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

2019

Geofluids

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“…9 Over the past few years, some researches and field applications (eg, the self-propulsion force of the hydraulic jet bit, the radial horizontal extension limit, the borehole trajectory measurement, the rock breaking capacity of the jet bit, the calculation of hydraulic parameters) have been conducted. [10][11][12][13] Obviously, the prediction of the fracture initiation in radial lateral boreholes should be studied in depth to more effectively control the variability of fractures.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on fracture initiation from radial micro‐hole in anisotropy formation

Zhang

Zheng

et al. 2021

Energy Science & Engineering

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“…A radial jet nozzle is the most critical actuator of an RJD system. The force generated by the jet nozzle to pull the high‐pressure hose moving forward, breaking the rock, and forming multiple lateral micro‐holes to enhance the production is called the self‐propelled force 20 . The structural parameters of a multi‐orifice nozzle play an important role in controlling the self‐propelled force, rock breaking force, jet pressure, and maximum drillable length 21‐24 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the factors affecting the self‐propelled force in a multi‐orifice nozzle using a novel simulation method

Zhang

2020

Energy Science & Engineering

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A multi‐orifice nozzle is the primary actuator of radial jet drilling for the stimulation of unconventional and low‐permeability reservoirs. This research developed a 3D flow field simulation model to investigate the self‐propelled force of a multi‐orifice nozzle based on ANSYS‐CFX. To evaluate the self‐propelled ability of the nozzle, investigation was performed on the effects of the angle, number, the diameter of the forward and backward orifices of the multi‐orifice nozzle, and the diameter of the micro‐hole in the radial well on its self‐propelled ability by sensitivity analysis. The results revealed that the self‐propelled force slightly increased with the angle of forward orifice increasing, and decreased with the angle of backward orifice increasing; and that the self‐propelled force had a tendency to decrease significantly with the number of forward orifices increasing, and increased slightly with the number of backward orifices increasing. The self‐propelled forces for different combinations of forward and backward orifices were obtained by the simulation method, which agreed well with those obtained by the calculation method, with an average accuracy of 95.82%. It was observed that the self‐propelled force increased substantially as the value of K (d2/d1) increased, but tended to slow down when the flow rate was within a certain range. Besides, with the increase in the diameter of the micro‐hole, the self‐propelled force reduced, and increased substantially as the inlet flow rate increased, but tended to slow down as the inlet flow rate further increased. Thus, to ensure the self‐propelled ability of the jet nozzle, a set of optimal structural parameters can be used to generate the target self‐propelled ability. The research improves the working performance of multi‐orifice nozzles and provides theoretical guidance for hydraulic radial jet drilling process.

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A discussion about the method to study the effect of ambient pressure on hydraulic jetting

Cited by 17 publications

References 17 publications

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

Numerical analysis on fracture initiation from radial micro‐hole in anisotropy formation

Investigation of the factors affecting the self‐propelled force in a multi‐orifice nozzle using a novel simulation method

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