Results 111 to 120 of about 4,970 (232)

Experimental study on the pseudo threshold pressure gradient of supported fractures in shale reservoirs

open access: yesJournal of Petroleum Exploration and Production Technology
Pseudo threshold pressure gradient (PTPG) exists in the propped fractured reservoir, but its nonlinear flow law remains unclear. The effects of the mineral composition of shale and microstructure of fracturing fluid on PTPG were analyzed by X-ray ...
Jidong Gao   +5 more
doaj   +1 more source

Microseismicity and permeability enhancement of hydrogeologic structures during massive fluid injections into granite at 3 km depth at the Soultz HDR site [PDF]

open access: yes, 2017
A high-rate injection of 20 000 m3 of water into granite between 2.8 and 3.4 km depth at the Soultz hot dry rock (HDR) test site in France in 1993 September led to a 200-fold increase in borehole transmissivity and produced a subvertical cloud of ...
Baria, R.   +8 more
core  

Full-waveform Based Complete Moment Tensor Inversion and Stress Estimation from Downhole Microseismic Data for Hydrofracture Monitoring [PDF]

open access: yes, 2011
Downhole microseismics has gained increasing popularity in recent years as a way to characterize hydraulic fracturing and to estimate in-situ stress state.
Song, Fuxian, Toksoz, M. Nafi
core  

Study on proppant flowback mechanism during post-fracturing stage based on CFD-DEM

open access: yesEarth Energy Science
Proppant flowback in the post-fracturing flowback period not only reduces the fracture conductivity but also damages equipment. Due to the current lack of experimental or numerical simulation methods for proppant flowback in partial closure fracture, the
Mingkun Lv   +5 more
doaj   +1 more source

Fracture network types revealed by well test curves for shale reservoirs in the Sichuan Basin, China

open access: yesEnergy Geoscience
Pressure buildup testing can be used to analyze fracture network characteristics and conduct quantitative interpretation of relevant parameters for shale gas wells, thus providing bases for assessing the well productivity and formulating proper ...
Yanyan Wang   +4 more
doaj   +1 more source

Crash tests of three identical low-wing single-engine airplane [PDF]

open access: yes
Three identical four place, low wing single engine airplane specimens with nominal masses of 1043 kg were crash tested under controlled free flight conditions. The tests were conducted at the same nominal velocity of 25 m/sec along the flight path.
Alfaro-Bou, E., Castle, C. B.
core   +1 more source

Fracture network simulation of normal pressure shale gas in complex tectonic regions and application practice

open access: yesYouqi dizhi yu caishoulu
Fracture network simulation is a key technology for quantitatively evaluating the geometric dimensions and conductivity of fracture networks, which is of great significance for the optimal deployment of well patterns and the optimization of fracturing
ZHANG Guorong   +4 more
doaj   +1 more source

Evaluating proppant performance and fracture conductivity dynamics in the Shenhu marine hydrate reservoir, South China Sea

open access: yesApplied Ocean Research
Hydraulic fracturing, which creates propped fractures to establish high-conductivity pathways near production wells, has emerged as a promising technology for boosting gas production efficiency in low-permeability marine natural gas hydrate (NGH ...
Bing Li   +6 more
doaj   +1 more source

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