Numerical study on the development of coalbed methane in multilateral horizontal wells considering coal seam cleats [PDF]
There are various forms of multilateral horizontal wells for developing coalbed methane, and the role of cleats in the development process is unclear.
Dandan DONG +5 more
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Extraction mode and engineering demonstration of pressure relief three-dimensional of multi-coal seams in Pingdingshan mining area [PDF]
There are many coal seams and gas-bearing strata in Pingdingshan mining area, and the amount of underground gas control project is large and difficult.
Jinsheng JIA, Xiaoming NI, Yanhe LI
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How Many Floods Have Occurred in China in the Past Decade? A Perspective From Social Media
Earth's Future, Volume 13, Issue 4, April 2025.Abstract Global climate change has led to frequent and widespread flood disasters in China. Traditional flood disaster investigations mainly focus on major flood events, and small‐scale flood events are often overlooked. This study utilized the Sina Weibo social media platform to detect flood events in 370 cities in China from 2012 to 2023.
D. Shen +5 more
wiley +1 more source
Research on key technology for efficient drilling and completion well of L-shaped horizontal well of surface mining [PDF]
The L-shaped horizontal shaft of surface mining is an effective technical means to realize the corner gas control in the upper corner of coal mining face.
Jing ZHANG, Yi WANG, Yuanzhi ZHANG
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Evolution of broken pressure and fracture morphology in indirect fracturing for broken-soft coal [PDF]
Indirect fracturing using a horizontal well in roof is a promising technology for methane exploitation in broken soft and low-permeability coal seams. Stratum-penetration fracturing and a complex fracture network with good conductivity are two keys for ...
Dijie ZHU +5 more
core +1 more source
Theoretical and technological system for Highly efficient development of deep coalbed methane in the Eastern edge of Erdos Basin [PDF]
Aiming at the development problems of deep coal reservoirs, such as deep burial, low permeability and complex stress field, this paper clarifies that the resource enrichment conditions, effective fracturing volume, effective horizontal section length ...
Borui XU +12 more
core +1 more source
Optimization and application of sand bailing technology for coalbed methane horizontal wells [PDF]
Objective and Methods Coalbed methane (CBM) horizontal wells face challenges such as sand accumulation in completion strings, pipe wall scaling, and pump sticking, leading to declined CBM production or shutdown of these wells.
Bao’an XIAN +10 more
core +1 more source
Shiyou jixie, 2014 为提高水平井裸眼长井段砾石充填密实效果，解决水平井筛管的堵塞问题，开发了水平井分段砾石充填技术。介绍了水平井裸眼分段砾石充填管柱、主要砾石充填工具——新型砾石充填复合防砂筛管、充填封隔器和充填洗井总成的结构及工作原理，阐述了水平井分段砾石充填技术在胜利油田单56-平23井的应用情况。应用结果表明，水平井分段砾石充填技术充填均匀可靠，效果理想，可避免长井段充填时因砂沉积在某一段而无法继续填砂的风险，有效提高了水平井裸眼长井段砾石充填密实程度，是长水平段水平井防砂技术的发展趋势。
马明新
doaj
Inter-cluster and intra-cluster flow distribution and proppant allocation in deep coalbed methane orientation fracturing [PDF]
China has abundant deep coalbed methane (CBM) resources with significant potential for development and utilization, which is expected to become an important supplement to national natural gas supply.
Mengmeng ZHOU +5 more
core +1 more source
Shiyou jixie, 2014 为满足油田长水平段（＞500 m）及超长水平段（＞1 500 m）水平井动态监测测井的井下仪器输送需要，着重介绍了牵引器输送、挠性管输送和水力输送等3种测井仪器井下输送新工艺技术，阐述了新工艺技术在油田套管水平井动态监测中的应用情况。应用结果表明，牵引器输送法可以完成固井质量检测、硼中子寿命测井找水、氧活化水流找水、井温及电磁探伤、陀螺测斜等测井项目，是目前水平井动态监测测井的最佳输送方式，但其对井眼条件要求较高，测井前需要彻底清洗井筒；水力输送法施工工艺简单，成本低，因此适用于水平井及大斜度井找水 ...
李湘涛 +4 more
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