Hydraulic Pulsed Cavitating Jet-Assisted Drilling

Li, G.; Shi, Huaizhong; Liao, Hualin; Shen, Zhonghou; Niu, Jilei; Huang, Zhongwei; Luo, Haibo

doi:10.1080/10916460701700302

Cited by 30 publications

(25 citation statements)

References 2 publications

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“…For the organ-pipe nozzles used in the experiment, four contraction ratio values were used, which were 2, 2.5, 3, and 3.5. All the nozzles had the same inlet and exit diameters of 13 mm and 2 mm, respectively, determined from the previous study performed by Li et al [18][19][20][21]. By making f 0 and f s equal, the relation of L c and D e can be obtained based on Equations (1)-(3):…”

Section: Bd Sensorsmentioning

confidence: 99%

“…They found that with the use of SRWJ, the rock erosion efficiency could be enhanced up to 2 times, and the average rates of penetration of tricone bits and bit footages could be increased by 31.2% and 29.1%, respectively. Afterward, by using the optimized organ-pipe nozzles, they claimed that the average injection pressure of SRWJ could be reduced by 2.1 MPa and the drilling rate in deep oil wells was considerably improved from 10.1% to 31.5% [19,20]. Subsequently, SRWJs were employed in more than 40 oil wells and the results showed that this jet could afford an effective approach to improve the rate of penetration in deep and ultra-deep wells [21].…”

Section: Introductionmentioning

confidence: 99%

“…Despite a great many investigations on SRWJ, it should be noticed that the optimal values of the downstream contraction ratio of organ-pipe nozzles are still unknown and need to be studied. So far, the organ-pipe nozzles used in the research are all manufactured using an equation that only gives the ratio of the chamber length to the exit diameter [13][14][15][16][17][18][19][20][21][22][25][26][27][28][29][30][31][32], and the detailed physical parameters required for fabricating an effective nozzle have not been reported.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

et al. 2018

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Self-resonating waterjets (SRWJs) are being widely used in the fields of energy exploitation, due to the significantly increased penetration rate of roller bits in deep-hole drilling. To further improve the impact and erosion abilities of SRWJs, the effects of the downstream contraction ratio of organ-pipe nozzle on the axial pressure oscillations were experimentally studied. The axial pressure oscillation peak and amplitude were used to evaluate the effects under two inlet pressures and various standoff distances. The results show that the downstream contraction ratio can affect the development trends of the pressure oscillations and determines the values of the peaks and amplitudes. Under the experimental conditions, 2.5 is the ratio that leads to the maximum peaks and amplitudes at almost all the testing standoff distances, while the ratio of 2 always results in the minimum ones. The development trend of the pressure oscillation peak for the ratio of 3.5 has a great change at an inlet pressure of 20 MPa. Generally, the relative pressure oscillations are more violent at an inlet pressure of 10 MPa, which is regardless of the contraction ratio. This study helps provide a guideline for determining the physical parameters required in the fabrication of organ-pipe nozzles used for deep-hole drilling.

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Section: Bd Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

et al. 2018

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“…This method can modulate the continuously flowing drilling fluid in the drill collar to the pulsed cavitating jet, thereby improving ROP by changing the bottom flow field and enhancing rock-breaking and rock-cleaning efficiency. A large number of field tests of HPCJDT mating with PDC bits and cone bits have been completed in different blocks of various oil fields, such as Xinjiang Tarim oil fields, the Yuanba Block in the Sichuan oil field, and the Yitong Block in the Jilin oil field (Zhang et al 2009;Li et al 2009a).…”

Section: Field Tests and Results Analysismentioning

confidence: 99%

“…For the jet modulation of the HPCJG, the key components are the impeller assembly, self-resonant chamber, and the nozzle (Li et al 2009b). The pulsationgeneration methods of the jet modulation include piston oscillation, mechanical-oscillation blocking, wall-jet diversion, and organ-pipe and Helmholtz acoustic resonance (Conn 1998).…”

Section: Hpcjgmentioning

confidence: 99%

A Novel Tool To Improve the Rate of Penetration–Hydraulic-Pulsed Cavitating-Jet Generator

Shi

et al. 2012

SPE Drilling &Amp; Completion

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On the basis of the analysis of the jet-modulating mechanism, a novel tool-a hydraulic-pulsed cavitating-jet generator (HPCJG)is designed to further improve the rate of penetration (ROP). The HPCJG combines the advantages of a pulsed jet and a cavitating jet. When the drilling fluid flows through this tool, the fluid will be modulated to the pulsed and cavitating jet by application of the impellers and by entering into the self-resonant chamber. During this process, a pulsed cavitating jet is formed at the outlet of the bit nozzle. Because of jet pulsation, cavitating erosion, and the local negative-pressure effect, the cleaning efficiency of the wellbottom cuttings and the ROP will be improved. Laboratory and oilfield tests have indicated that the pulsed-pressure amplitude and the pressure drop of the generator increase with the increase of the flow rate. However, the frequency of the pressure pulsation is invariable in this process. This generator has been applied to more than 100 wells in eight oil fields throughout China. The results show that the maximum density of the test drilling fluid is 1.93 g/cm 3 , the maximum test-well depth is 6162 m, and the operation time of the generator is more than 230 hours (the maximum operation time recorded was more than 520 hours). Furthermore, the average ROP was increased by approximately 16.7% to 104.4%. In conclusion, the generator has the characteristics of a simple structure, has a long lifetime, is able to adapt well with existing drilling equipment, and can provide a safe and efficient drilling technique for deep wells.

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Effects of pulsating fluid at nozzle inlet on the output characteristics of common and self‐excited oscillation nozzle

Feng

Wang

Kong

2022

Energy Science & Engineering

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High-speed water jets are key technologies for increased production efficiency in oil drilling, and high-speed self-excited oscillating pulsed water jets (SEOPWs) offer many advantages compared to continuous jets for most industrial applications. Therefore, many studies have focused on this topic.However, the current studies on hydraulic pulsed jets have rarely extended to integrated modeling of the high-speed water jet transmission process. To better apply the SEOPWs, based on fluid mechanics, the theoretical model of the plunger pump-pipeline-nozzle is established, and the sensitivity of different nozzles on the pulsating fluid is studied in the time domain.Furthermore, the vibration characteristics of the nozzle are further investigated in the frequency domain. The results show that the common nozzle has an enlarged role in the pressure amplitude, the Helmholtz nozzle enlarges the pressure peak and amplitude, and the amplification is more obvious with the speedy growth on the plunger pump. However, as the pipeline becomes longer, the difference between the pressure of the inlet and outlet does not change. Therefore, the nozzle is more sensitive to the change in the plunger pump speed. In the frequency domain, the secondary frequency peak for the Helmholtz nozzle is 1.26 times larger than the interference frequency, while it is 1.08 times for the common nozzle. Helmholtz nozzles tend to produce stronger natural vibrations than common nozzles. By comparing the impact force, the experimental results show good agreement with the simulated results. The study provides a theoretical basis for water jet-assisted drilling in deep wells and lays the foundation for the better application of self-oscillating impact drilling tools.

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Hydraulic Pulsed Cavitating Jet-Assisted Drilling

Cited by 30 publications

References 2 publications

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

A Novel Tool To Improve the Rate of Penetration–Hydraulic-Pulsed Cavitating-Jet Generator

Effects of pulsating fluid at nozzle inlet on the output characteristics of common and self‐excited oscillation nozzle

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