New Mechanical Model of Slotting–Directional Hydraulic Fracturing and Experimental Study for Coalbed Methane Development

2020 ◽  
Author(s):  
Jianyu Zhong ◽  
Zhaolong Ge ◽  
Yiyu Lu ◽  
Zhe Zhou ◽  
Jingwei Zheng
Keyword(s):  
Experimental Study ◽  
Hydraulic Fracturing ◽  
Mechanical Model ◽  
Coalbed Methane ◽  
Directional Hydraulic Fracturing

Experimental study on crack propagation control and mechanism analysis of directional hydraulic fracturing

Fuel ◽  
2018 ◽  
Vol 218 ◽  
pp. 316-324 ◽  
Author(s):  
Yugang Cheng ◽  
Yiyu Lu ◽  
Zhaolong Ge ◽  
Liang Cheng ◽  
Jingwei Zheng ◽  
...  
Keyword(s):  
Experimental Study ◽  
Hydraulic Fracturing ◽  
Crack Propagation ◽  
Mechanism Analysis ◽  
Directional Hydraulic Fracturing

Directional distance prediction model of slotting–directional hydraulic fracturing (SDHF) for coalbed methane (CBM) extraction

2019 ◽  
Vol 183 ◽  
pp. 106429 ◽  
Author(s):  
Zhaolong Ge ◽  
Jianyu Zhong ◽  
Yiyu Lu ◽  
Liang Cheng ◽  
Jingwei Zheng ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Prediction Model ◽  
Coalbed Methane ◽  
Directional Hydraulic Fracturing ◽  
Distance Prediction

Experimental study of the stimulating mechanism of shut-in after hydraulic fracturing in unconventional oil reservoirs

Fuel ◽  
2021 ◽  
Vol 300 ◽  
pp. 120982
Author(s):  
Junrong Liu ◽  
James J. Sheng ◽  
Hossein Emadibaladehi ◽  
Jiawei Tu
Keyword(s):  
Experimental Study ◽  
Hydraulic Fracturing ◽  
Oil Reservoirs ◽  
Unconventional Oil

scholarly journals Directional Hydraulic Fracturing (DHF) of the Roof, as an Element of Rock Burst Prevention in the Light of Underground Observations and Numerical Modelling

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 562
Author(s):  
Marek Jendryś ◽  
Andrzej Hadam ◽  
Mateusz Ćwiękała
Keyword(s):  
Rock Mass ◽  
Hydraulic Fracturing ◽  
Coal Mining ◽  
Rock Burst ◽  
Coal Mine ◽  
Seismic Activity ◽  
Black Coal ◽  
Directional Hydraulic Fracturing ◽  
Before And After ◽  
The Face

The following article analyzes the effectiveness of directional hydraulic fracturing (DHF) as a method of rock burst prevention, used in black coal mining with a longwall system. In order to define changes in seismic activity due to DHF at the “Rydułtowy” Black Coal Mine (Upper Silesia, Poland), observations were made regarding the seismic activity of the rock mass during coal mining with a longwall system using roof layers collapse. The seismic activity was recorded in the area of the longwall itself, where, on a part of the runway, the rock mass was expanded before the face of the wall by interrupting the continuity of the rock layers using DHF. The following article presents measurements in the form of the number and the shock energy in the area of the observed longwall, which took place before and after the use of DHF. The second part of the article unveils the results of numerical modeling using the discrete element method, allowing to track the formation of goafs for the variant that does not take DHF into consideration, as well as with modeled fractures tracing DHF carried out in accordance with the technology used at “Rydułtowy” coal mine.

Impact of Shut-in Time on Production after Hydraulic Fracturing in Fractured Shale Gas Formation: An Experimental Study

2021 ◽  
pp. 103773
Author(s):  
Xingyuan Liang ◽  
Tianbo Liang ◽  
Fujian Zhou ◽  
Caizhong Wang ◽  
Kai Yang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Hydraulic Fracturing ◽  
Shale Gas ◽  
Gas Formation

scholarly journals Numerical simulation of the laws of fracture propagation of multi-hole linear co-directional hydraulic fracturing

2021 ◽  
pp. 014459872198899
Author(s):  
Weiyong Lu ◽  
Changchun He
Keyword(s):  
Hydraulic Fracturing ◽  
Hydraulic Fracture ◽  
Minimum Principle ◽  
Fracture Propagation ◽  
Axial Direction ◽  
Rock Breaking ◽  
Hydraulic Fractures ◽  
Directional Hydraulic Fracturing ◽  
Fracture Intersection ◽  
Expansion Stage

Directional rupture is one of the most important and most common problems related to rock breaking. The goal of directional rock breaking can be effectively achieved via multi-hole linear co-directional hydraulic fracturing. In this paper, the XSite software was utilized to verify the experimental results of multi-hole linear co-directional hydraulic fracturing., and its basic law is studied. The results indicate that the process of multi-hole linear co-directional hydraulic fracturing can be divided into four stages: water injection boost, hydraulic fracture initiation, and the unstable and stable propagation of hydraulic fracture. The stable expansion stage lasts longer and produces more microcracks than the unstable expansion stage. Due to the existence of the borehole-sealing device, the three-dimensional hydraulic fracture first initiates and expands along the axial direction in the bare borehole section, then extends along the axial direction in the non-bare hole section and finally expands along the axial direction in the rock mass without the borehole. The network formed by hydraulic fracture in rock is not a pure plane, but rather a curved spatial surface. The curved spatial surface passes through both the centre of the borehole and the axial direction relative to the borehole. Due to the boundary effect, the curved spatial surface goes toward the plane in which the maximum principal stress occurs. The local ground stress field is changed due to the initiation and propagation of hydraulic fractures. The propagation direction of the fractures between the fracturing boreholes will be deflected. A fracture propagation pressure that is greater than the minimum principle stress and a tension field that is induced in the leading edge of the fracture end, will aid to fracture intersection; as a result, the possibility of connecting the boreholes will increase.

scholarly journals Micro-nano-scale Stimulation of Coalbed Methane Reservoir: Experimental Hydraulic Fracturing and Pore Connectivity

2020 ◽  
Author(s):  
Jienan Pan ◽  
Pengwei Mou ◽  
Yiwen JU ◽  
Kai Wang ◽  
Taoyuan Ge ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Coalbed Methane ◽  
Pore Connectivity ◽  
Nano Scale ◽  
Coalbed Methane Reservoir ◽  
Stimulation Of

Laboratory Tests To Determine Parameters for Hydraulic Fracturing of Coalbed Methane

1991 ◽  
Author(s):  
G.S. Penny ◽  
M.W. Conway ◽  
R.C. Klem
Keyword(s):  
Hydraulic Fracturing ◽  
Coalbed Methane ◽  
Laboratory Tests
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