Study on the rock‐breaking effect of water jets generated by self‐rotatory multinozzle drilling bit

Liu, Yanbao; Ba, Quanbin; He, Lipeng; Shen, Kai; Xiong, Wei

doi:10.1002/ese3.679

Cited by 20 publications

(11 citation statements)

References 24 publications

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“…As shown in Figure 3, its In the process of radial horizontal well, the nozzle needs to complete the steering under the steering effect of the deflector. In order to pass the deflector smoothly, the length of the nozzle is generally designed to be 30~50 mm, and the outer diameter is generally 20~30 mm [21,[32][33][34]. Therefore, the length of the impeller designed in this paper is no more than 50 mm, and the outer diameter is 18 mm.…”

Section: Experimental Projectmentioning

confidence: 99%

Flow Field Simulation of Swirling Abrasive Jet Nozzle for Hard Rock Breaking

Zhang

et al. 2022

Geofluids

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Radial jet drilling (RJD) technology has been proved to be an economical and efficient stimulation technology for oil and gas, geothermal, hydrate, etc. but conventional RJD technology adopts pure water jet to break rock and form laterals, which has low rock breaking efficiency and is unable to effectively break hard rock such as shale. Swirling abrasive jet is proposed to promote the development of RJD. Here, the characteristics of the flow field of the swirling abrasive jet nozzle and the influence of the key impeller parameters are studied by numerical simulation. The distribution and development of axial velocity, tangential velocity, and radial velocity of water and abrasive are analyzed. The results show that the swirling abrasive jet has no constant velocity core, has stronger diffusivity, and can form a larger impact area than the direct jet. Abrasive particles and water can acquire large tangential and radial velocity which can break rock under the action of shear and tensile stress efficiently. With the increase of the spinning angle, the axial velocity of the fluid decreases, and the tangential velocity increases gradually. With the increase of blade thickness, the axial velocity decreases, and the tangential velocity increases. With the increase of the number of blades, the axial velocity decreases, and the tangential velocity increases. The spinning direction almost has no effect on the flow field. Therefore, the spinning angle is recommended to be no less than 270°, blade thickness is 2.5 mm, and number of blades are 3. The research results provide theoretical guidance for the structural design of swirling abrasive jet nozzles.

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Section: Experimental Projectmentioning

confidence: 99%

Flow Field Simulation of Swirling Abrasive Jet Nozzle for Hard Rock Breaking

Zhang

et al. 2022

Geofluids

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“…[17][18][19][20] For a straight jet, He et al 21 examined the effect of multinozzle bit on sandstone specimens by means of numerical simulation and experiment and verified the rationality. Liu et al 14 adopted the FLUENT combined with RNG turbulence model to analyze the multinozzle jets flow field and study the effects of inclination-angle of forward nozzles and standoff distance. Xiao et al 22 established the threedimension drilling model of the self-rotatory water-jet bit, and conducted the numerical simulation of this model based on the sliding mesh model combined with RNG turbulence model; for a swirling jet, there has a central low-speed zone, which will reduce the drilling efficiency 23 ; for a combination jet, a dual-jet 24,25 can combine the advantages of both a straight and a swirling jet, however, its complex structure and larger volume mass limit its wide use in RJD.…”

Section: Introductionmentioning

confidence: 99%

Internal flow field and rock‐breaking characteristics of a straight‐swirling mixed jet and its influential factors in radial jet drilling

Peng

Wei

et al. 2022

Energy Science & Engineering

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The use of radial jet drilling (RJD) to exploit unconventional natural gas is an attractive study area. A self‐propelled bit enormously affects the drilling efficiency. Herein, for a straight‐swirling mixed jet (SSMJ) bit, the internal and external velocity fields were analyzed using a simulation to reveal a jet mixed mechanism. The rock‐breaking characteristics of different bit structures were investigated using laboratory experiments. A straight jet and a swirling jet were independent flowing through the impeller and were gradually mixed together in the mixing chamber inside the bit. The jets' boundary gradually dissipated along the radial direction, and the swirling jet distribution along the circumferential direction tended to be uniform. The velocity vector gradually decreased from the center to the periphery, and the energies were slowly concentrated due to the cluster‐narrowing by the conical wall until the velocity at the nozzle outlet reached its peak. Different flow fields were modulated by changing the bit structures. The diameters ratio greatly affected the distribution proportion of straight and swirling; the length‐diameter ratio primarily affected the contribution of the swirling jet to its center, and the width‐diameter ratio chiefly affected the initial formation velocity of the swirling jet, which all directly affected the depth variation along the radial and diameter of a borehole. The hole depth and diameter, erosion volume, and bottom flatness were combined to evaluate the rock‐breaking performance. The bit with a diameters ratio of 0.67, a length‐radius ratio of 0.57, and the width‐radius ratio of 0.13 had the best erosion effect. The simulation and experimental results achieved good mutual verifications. Overall, this study can guide research on the SSMJ rock‐breaking mechanism and bit design for RJD.

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“…Zong et al (2020) carried out a three-dimensional numerical simulation study regarding the impact processes of gas-liquid jets; analyzed the macroparameters of the jet reaction plumes and their variation rules; and investigated the influencing effects of inlet pressure on the temperature distributions of convection fields and the corresponding relationships between the inlet pressure and the gas plumes. Furthermore, some researchers adopted numerical simulation methods to study the influences of geometric and injector parameters on water jet flow fields, and then successfully optimized the injector parameters (Liu et al, 2020;Yang et al, 2019b). The research regarding water jet impinging on surfaces with different shapes has been further deepened with the development of numerical simulation technology.…”

Section: Introductionmentioning

confidence: 99%

An experimental and simulation study of the flow pattern characteristics of water jet impingements in boreholes

Gao

Xiang

et al. 2021

Energy Exploration & Exploitation

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Hydraulic slotting has become one of the most common technologies adopted to increase permeability in low permeability in coal field seams. There are many factors affecting the rock breaking effects of water jets, among which the impact force cannot be ignored. To study the influencing effects of contact surface shapes on jet flow patterns and impact force, this study carried out experiments involving water jet impingement planes and boreholes under different pressure conditions. The investigations included numerical simulations under solid boundary based on gas–liquid coupling models and indoor experiments under high-speed camera observations. The results indicated that when the water jets impinged on different contact surfaces, obvious reflection flow occurred, and the axial velocity had changed through three stages during the development process. Moreover, the shapes of the contact surfaces, along with the outlet pressure, were found to have impacts on the angles and velocities of the reflected flow. The relevant empirical formulas were summarized according to this study's simulation results. In addition, the flow patterns and shapes of the contact surfaces were observed to have influencing effects on the impact force. An impact force model was established in this study based on the empirical formula, and the model was verified using both the simulation and experimental results. It was confirmed that the proposed model could provide important references for the optimization of the technical parameters water jet systems, which could provide theoretical support for the further intelligent and efficient transformation of coal mine drilling water jet technology.

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Study on the rock‐breaking effect of water jets generated by self‐rotatory multinozzle drilling bit

Cited by 20 publications

References 24 publications

Flow Field Simulation of Swirling Abrasive Jet Nozzle for Hard Rock Breaking

Flow Field Simulation of Swirling Abrasive Jet Nozzle for Hard Rock Breaking

Internal flow field and rock‐breaking characteristics of a straight‐swirling mixed jet and its influential factors in radial jet drilling

An experimental and simulation study of the flow pattern characteristics of water jet impingements in boreholes

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