Design study of impact performance of a DTH hammer using PQRSM and numerical simulation

Kim, Dae-ji; Oh, Joo-Young; Cho, Jung-Woo; Kim, Jae-Won; Chung, Jintai; Song, Chang-Heon

doi:10.1007/s12206-019-1052-0

Cited by 14 publications

(11 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Motion. e hammer model uses the following equation of motion for the transfer of pneumatic energy from the piston to the drill bit as impact energy [11], as shown in Figure 2:…”

Section: Governing Equation For the Impact Hammermentioning

confidence: 99%

“…Reaction force F re due to the stiffnesses of the bit and rock after impact is defined as follows [11]:…”

Section: Governing Equation For the Impact Hammermentioning

confidence: 99%

“…In situ drilling tests were performed to verify the proposed performance prediction model. e DTH hammer and drilling system were optimized [11,19]. e rock specimens were made of concrete with a compressive strength corresponding to that of medium-hard rock.…”

Section: Verification Of the Simulation Model For Predicting Thementioning

confidence: 99%

“…In this study, a new method was developed for predicting the drilling performance of a DTH hammer. A numerical model was developed that combines two previous models: Song et al's drill bit-rock interaction model [1] and hammer dynamics model [11].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Kim

Lee

et al. 2020

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

This study suggests a method for quantitatively estimating the drilling performance of the down-the-hole (DTH) hammer during percussive drilling of rock surfaces. A pneumatic dynamic model of the DTH hammer was developed that considers the mass flow rate relations representing the orifice opening areas of the air tube, the piston, and bit flushing channels. A drill bit motion model was developed to represent the dynamics of a drill bit impacted by a dropped piston and explain the impact stress propagation and rock-crushing mechanism. The rock-crushing effect of the drill button bit was measured through a piston drop test. The pneumatic hammer model and drill bit motion model were then combined in a prediction model to determine the impact efficiency according to different rock types (i.e., soft, medium-hard, and very hard). The drilling efficiency was defined as the input value of the prediction model, which was used to simulate the drilling performance of DTH hammers considering the rock type and dynamic effect of the drill bit. Finally, the simulation results were compared with the results of in situ drilling tests for verification.

show abstract

“…Motion. e hammer model uses the following equation of motion for the transfer of pneumatic energy from the piston to the drill bit as impact energy [11], as shown in Figure 2:…”

Section: Governing Equation For the Impact Hammermentioning

confidence: 99%

“…Reaction force F re due to the stiffnesses of the bit and rock after impact is defined as follows [11]:…”

Section: Governing Equation For the Impact Hammermentioning

confidence: 99%

Section: Verification Of the Simulation Model For Predicting Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Kim

Lee

et al. 2020

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Eremenko et al [14] determined the causes of performance drop in induced block caving using fans of two types of the hammer and discussed alternatives of improvement in drilling efficiency. Kim et al [15,16] developed a pneumatic dynamic model of DTH hammer to predict drilling performance and validated the model through laboratory tests. e application of the DTH hammer in the vertical section of oil fields has shown that its penetration rate is several times that of conventional rotary drilling.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self‐Propelled Round Bit

Sun

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

Although pneumatic down-the-hole (DTH) hammers have good performance of high penetration rate and minimal deviation tendency in the vertical section of oil and gas wells, they have not been successfully used in directional drilling due to drill tool wear and wellbore disturbance. Herein, we developed a novel type of pneumatic DTH hammer with a self-propelled round bit to overcome the technical difficulties of directional drilling. Nonlinear dynamic modeling developed by the authors was used to analyze the working principle and performance of the novel DTH hammer. The kinematics and dynamics simulation of this hammer were carried out using MATLAB language, and the motion law of the piston was revealed. The performance of the novel hammer was numerically simulated and evaluated by considering fluctuations of the front and rear chamber pressure, impact energy, acceleration, and frequency. The results show that our novel DTH hammer’s working principle is feasible and has an adequate structural design. The simulation results demonstrate reasonable design parameters. Compared to the numerical results for conventional DTH hammers, the velocity and acceleration of the piston of the novel hammer changed smoothly. The frequency was slightly higher than that of conventional hammers, while other parameters were nearly equal. The novel DTH hammer can be used in directional drilling, trenchless drilling, and seabed sampling drilling.

show abstract