A mathematical model of the motion of cutting particles in reverse circulation air drilling

Zhu, Lei; Huang, Yi; Wang, R.H.; Wang, J.Y.

doi:10.1016/j.amc.2014.12.153

Cited by 11 publications

(9 citation statements)

References 19 publications

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“…e research on this sampling technology mainly focuses on the characteristics of the gas-solid flow field in the reverse circulation pipeline [23][24][25][26] and the improvement of sampling efficiency [27][28][29]. However, there is a lack of studies on the change rule of factors affecting gas loss in the process of sampling.…”

Section: Introductionmentioning

confidence: 99%

Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling

Chen

Long

et al. 2021

Advances in Civil Engineering

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The gas loss in sampling is the root of coalbed gas content measurement error. The pressure and particle size have a significant impact on the gas loss. Using the self-developed coal particle pneumatic pipeline transportation experimental system, this study investigated the pressure and particle size changes in the sampling pipeline. It is found that the sampling process can be divided into four stages: no flow field stage, sample outburst stage, stable conveying stage, and tail purging stage. The extreme pressure in the sampling pipeline appears at the sample outburst stage; and the pressure in the pipeline has levelled off after sharp decrease in the stable conveying stage. It is also found that the extreme pressure increases first and then decreases with the increase of particle size. The duration of outburst stage is negatively correlated with particle size, and that of stable conveying stage is positively correlated with particle size. In addition, the results show that the loss rate of 1–3 mm particles is the smallest after the test but that particles less than 1 mm increase by about two times and particles greater than 3 mm decrease by more than three times. The study also shows that the particle size distribution of coal samples is a single peak with left skew distribution, and the gas reverse circulation sampling test does not change the location of the peak but makes it higher and sharper. The single size coal sample is more likely to collide than the mixture. This study can help to advance the understanding of impact factors on gas loss during reverse circulation sampling.

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Section: Introductionmentioning

confidence: 99%

Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling

Chen

Long

et al. 2021

Advances in Civil Engineering

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“…Thus, the volume of air injection will be different. The compressibility of the air because of an increase in the depth of the borehole gradually decreases the volume of air injection [24]. In addition, the volume of the air also changes gradually as it returns.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of air velocity and size of the particle are considered in this model. The model was solved analytically by Zhu et al [24]. We have designed a hybrid of Artificial Neural Networks (ANNs) and BHCS algorithm, named as the ANN-BHCS algorithm.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Mathematical Model for Drilling System With Reverse Air Circulation by Using the ANN-BHCS Technique

et al. 2021

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“…To clarify the effect of various bit designs on the borehole cleanup capability, three conceptual designs of asymmetric drill bits are proposed and the fluid flow field below each drill bit is numerically investigated. Researches [Walker and Li (2000); Li and Walker (2001); Yong, Lihong, Deyong et al (2016); Zhu, Huang, Wang et al (2015)] have been conducted to evaluate the borehole cleanup, the concept of critical energy per unit volume of fluid s adopted in this study to quantify the borehole cleanup capability, and as suggested by Lyons et al [Lyons, Guo and Seidel (2001)], to effectively remove drill cuttings, the required energy per unit volume is 143.4 J/m 3 , which is used to study the applicability of the proposed three drill bit designs. Numerical investigations are conducted using Finite Element Method (FEM).…”

Section: Introductionmentioning

confidence: 99%

Finite Element Investigation of Flow Field Below Asymmetric Drill Bits for Reverse Circulation in Drilling Tight Oil and Gas Reservoirs

Shi¹,

Feng²,

Guo³

et al. 2019

Computer Modeling in Engineering &Amp; Sciences

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Development of unconventional tight oil and gas reservoirs such as shale pays presents a huge challenge to the petroleum industry due to the naturally low permeability of shale formations and thus low productivity of oil and gas wells. Shale formations are also vulnerable to the contamination of the water in the drilling and completion fluids, which further reduces reservoir permeability. Although gas-drilling (drilling with gas) has been used to address the issue, several problems such as formation water influx, wellbore collapse, excessive gas volume requirement and hole cleaning in horizontal drilling, still hinder its application. A new technique called gas-lift drilling has recently been proposed to solve these problems, but the optimal design of drilling operation requires a thorough investigation of fluid flow field below the asymmetric drill bits for evaluating the fluid power needed to clean the bottom hole. Such an investigation is conducted in this work based on the Finite Element Method (FEM) implemented in an open source computational framework, FEniCS. Pressure and flow velocity fields were computed for three designs of drill bit face characterized by radial bit blades and one eccentric orifice of discharge. One of the designs is found superior over the other two because it generates relatively uniform flow velocities between blades and provides a balanced fluid power needed to clean all the bit teeth on each bit blade. To quantify the capability of borehole cleanup presented by three drill bit designs, the energy per unit volume is calculated in each region of drill bit and compared with the required value suggested by the literature. In addition, the developed FEM model under FEniCS framework provides engineers an accurate tool for optimizing drill bit design for efficiently gas-lift drilling unconventional tight oil and gas reservoirs.

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A mathematical model of the motion of cutting particles in reverse circulation air drilling

Cited by 11 publications

References 19 publications

Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling

Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling

Analysis of a Mathematical Model for Drilling System With Reverse Air Circulation by Using the ANN-BHCS Technique

Finite Element Investigation of Flow Field Below Asymmetric Drill Bits for Reverse Circulation in Drilling Tight Oil and Gas Reservoirs

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