Results 51 to 60 of about 1,297 (234)

Integrated design and control technology of liner completion and drilling for horizontal wells

Petroleum Exploration and Development
Aiming at the problems of large load of rotation drive system, low efficiency of torque transmission and high cost for operation and maintenance of liner steering drilling system for the horizontal well, a new method of liner differential rotary drilling
Deli GAO, Baoan XIAN, Yansen BI
doaj   +1 more source

Shaping research in marine functional connectivity for integrated and effective marine science and management

Biological Reviews, EarlyView.
ABSTRACT Effective knowledge of ecological connectivity at sea and at the land–sea interface is key to supporting global policy goals to conserve and restore ocean biodiversity and function. However, a persistent lack of commonality in terminology and understanding around the concept of connectivity in marine ecological studies hampers its integration ...
Audrey M. Darnaude, Susanne E. Tanner, Andreu Blanco, Anna M. Sturrock, Yael Teff Seker, Angel Pérez‐Ruzafa, Jonne Kotta, Tamar Guy‐Haim, Francisco R. Barboza, Manuel Hidalgo, Katell Guizien, Jerneja Penca, Lucía López‐López, Maria Beger, Federica Costantini, Sophie Arnaud‐Haond, Cynthia Riginos, Kris Hostens, Gil Rilov, Stelios Katsanevakis, Ewan Hunter   +20 more
wiley   +1 more source

Optimization Design Method and Application of Nitrogen Horizontal Well Drilling Technology in Coalbed Methane Reservoirs

Energy Science & Engineering
Due to characteristics such as low permeability, low pressure, low gas saturation, low water content, and high structural stress, Yuwang coalbed methane (CBM) is prone to issues such as well leakage, coal sensitivity to water, and coal fines blockage ...
Hu Jiachen, Tan Zhanglong, Yang Fan, Hao Zhaobing, Yang Qi, Feng Lei, Wang Peng   +6 more
doaj   +1 more source

Nanoparticles in microdroplets: Recent advances in microfluidic generators for producing functional microbeads

Droplet, EarlyView.
Functional hybrid microbeads with electrical, magnetic, and/or optical responsiveness have emerged as versatile platforms for biotechnology. This review highlights recent advances in microfluidic technologies for producing such microbeads, with a focus on incorporating functional nanoparticles in microdroplet systems.
  Bayinqiaoge, Chengchen Zhang, Shi‐Yang Tang   +2 more
wiley   +1 more source

Theoretical problems of pipe inserting by making use of the method of horizontal directional drilling [PDF]

Acta Montanistica Slovaca, 2008
The technology of pipe laying by making use of the method of horizontal directional drilling with a high-pressure liquid and withbackward laying (hereinafter HDD technology – Horizontal Directional Drilling) has been considerably used in the Czech ...
Jaroslav Raclavský
doaj  

Slit tube responses and rock fracture characteristics in slit charge blasting under high in situ stress

Deep Underground Science and Engineering, EarlyView.
In this article, the finite element method‐smoothed particle hydrodynamics adaptive coupling algorithm is applied to numerically simulate and analyze the dynamic response of the slit tube and the crack propagation under high in situ stress. The dynamic response of the slit tube mainly exhibits radial response in the vertical direction of the slit and ...
Zhe Sui, Liyun Yang, Lijun Wu, Chenxi Ding   +3 more
wiley   +1 more source

Optimization of cut‐hole layout under high in situ stress based on numerical simulation and field tests

Deep Underground Science and Engineering, EarlyView.
This study investigates the blast‐induced rock damage patterns under different cut‐hole layouts and ground stress conditions through numerical simulations and field tests. The findings in this study provide valuable insights for similar underground engineering applications.
Junjie Zhao, Diyuan Li, P. G. Ranjith, Xinxin Lü, Yanliang Li, Xiaoli Su   +5 more
wiley   +1 more source

Semi‐analytical solution for the stability of deep vertical shaft considering time‐dependent rock‐structure interaction

Deep Underground Science and Engineering, EarlyView.
A novel cavity contraction solution and multilayer shaft wall model were developed to analyze deep shaft stability, considering rock viscosity, support structures, and water pressure, with successful validation through a Hulusu Coal Mine case study.
Bin Chen, Pinqiang Mo, Zhao Lu, Lianfei Kuang, Qiang Zhang, Abolfazl Eslami   +5 more
wiley   +1 more source

Gaborlet‐guided sparse filtering: A novel intelligent method for lithology identification by vibration signals while drilling

Deep Underground Science and Engineering, EarlyView.
The flowchart illustrates rock specimen testing, vibration signal acquisition, and feature extraction with Gaborlet and sparse filtering for classification. Abstract Traditional lithology identification methods mainly rely on core sampling and well‐logging data.
Jian Hao, Danqi Zhang, Zhenqi Song, Jinrui Wang, Qi Wang, Heqing Liu   +5 more
wiley   +1 more source

Mechanism and disaster control new technology of strong ground pressure manifestation in ultra‐large mining face

Deep Underground Science and Engineering, EarlyView.
In response to the problem of strong mining pressure manifestation along the goaf roadway in a thick coal seam mining area, this study uses a new type of combined blasting roof cutting technology to effectively control the manifestation and deformation of mining pressure along the goaf roadway.
Xiaoding Xu, Manchao He, Jun Yang, Yubing Gao, Qiang Fu, Qing Ma, Yajun Wang   +6 more
wiley   +1 more source