Abstract
Particle jet impact drilling technology is an efficient method which mainly uses high-velocity particles to break rock. As the important criterion for evaluating rock-breaking effect, rock-breaking depth and damage area were studied in this paper. Firstly, a particle jet impact rock-breaking test device was developed, and laboratory experiments have been carried out. Then, based on the spherical cavity expansion theory, the mathematical model of rock-breaking depth and damage area under particle jet impact was established. Afterward, the effect of water-jet impact velocity, impact angle, and particle diameter on rock-breaking depth and damage area was analyzed by comparing experimental results and mathematical calculation. The results show that rock-breaking depth and damage area would increase with increase of water-jet impact velocity and decrease slightly with increase of particle diameter. And the combination of 8° and 20° is recommended for nozzle layout. The experimental results and mathematical calculation are basically consistent, which could verify the correctness of the mathematical model. The study has significance for development and application of particle jet impact rock-breaking technology and perfection of theoretical research.
Highlights
Particle jet impact drilling technology is an efficient method which mainly uses high-velocity particles to break rock
The combination of 8° and 20° is recommended for nozzle layout. e experimental results and mathematical calculation are basically consistent, which could verify the correctness of the mathematical model. e study has significance for development and application of particle jet impact rock-breaking technology and perfection of theoretical research
Particle jet impact drilling technology is a high-efficiency noncontact rockbreaking process which is mainly based on subsonic particle impact and break rock, while being supplemented by highvelocity water jet and mechanical bit. e work principle is that a certain ratio of steel particles is added to drilling fluid and particles are accelerated by special nozzle to form subsonic particle jet
Summary
With the depletion of shallow petroleum resources, deep oil and gas reservoirs in complex strata have gradually become the focus of petroleum exploration. The flow field and size optimization of nozzle were studied based on computational fluid dynamics [28], and rock-breaking process and broken depth were simulated to reveal rock-breaking mechanism based on the SPH-FEM method [29, 30]. Theoretical study in particle jet impact rockbreaking field was carried out widely with simulation method; it is less with mathematical modeling method, especially in aspect of rock-breaking depth and damage area. Rough comparison and verification of mathematical model and laboratory experiment, the effect of different jet parameters on rock-breaking depth and damage area would be analyzed, and the correctness of mathematical model would be verified, which can realize quantitative analysis of jet parameters on rock-breaking effect and prediction of rock-breaking depth and area and can provide support for the development of rock-breaking theory and the engineering application of particle jet impact drilling technology Theoretical study in particle jet impact rockbreaking field was carried out widely with simulation method; it is less with mathematical modeling method, especially in aspect of rock-breaking depth and damage area. e purpose of this paper is to study rockbreaking depth and damage area under particle jet impact, so as to realize the analysis and evaluation of rock-breaking effect. rough comparison and verification of mathematical model and laboratory experiment, the effect of different jet parameters on rock-breaking depth and damage area would be analyzed, and the correctness of mathematical model would be verified, which can realize quantitative analysis of jet parameters on rock-breaking effect and prediction of rock-breaking depth and area and can provide support for the development of rock-breaking theory and the engineering application of particle jet impact drilling technology
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