Monitoring and fracture propagation evaluation of ground-level horizontal well staged fracturing for dual disaster control of rockburst and roof-separation water
HAN Liang
CAO Kuo
WU Weixing
CHEN Jianwei
LI Juntao
CHEN Pengyu
WANG Shuaiqi
Abstract：Aiming at the dual disaster threats of impact ground pressure and roof slab water damage in Zhaox-ian Coal Mine,it is proposed to adopt segmental fracturing of horizontal wells on the ground for disaster preven-tion and control.According to the key layer theory and the expansion mechanism of water-conducting fracture zone,40～50 m composite sandstone layer above the coal seam is identified as the target fracturing layer,and 32 fracturing segments are arranged to implement fracturing weakening to the target layer.Concurrently,joint fracturing monitoring is conducted by placing micro-seismic sensors above and below the wells to capture mi-croseismic signals during the fracturing period.Additionally,pressure sensors and flow meters are installed at the wellheads to monitor the pumping and injecting pressures throughout the fracturing process The changes in pumping pressure,flow rate,displacement and other parameters during the fracturing process are recorded,along with the water outflow from each section of the well during the fracturing period.The results show that by incorporating atemporary plugging agent,each fractured section undergo 3 to 4 cycles of repeated fracturing.Large energy microseismic events typically occur during the formation fracturing and fracture extension stages.Throughout the fracturing construction period,there is a significant increase in both the frequency and energy of microseismic events,with events exceeding 103 J accounting for 83.17％of the total energy.Based on the geo-metrical pattern of fracture spatial expansion derived from the projection of microseismic events,the average length of fractures 32 fractured sections reached 317m,while the average fracture height was 46.8m,meeting the design requirements in both horizontal and vertical.dimensions.The percentages of 5.1％,30.8％,and 32.9％can serve as reference points for determining the timing and quantity of the temporary plugging agent to be added.In comparison to the unfractured workface,after fracturing,the mineral pressure during the initial mining and"square"period remained stable,and both the height of the water-conducting fissure zone and the fracture-mining ratio exhibited a decreasing trend.This indicates that the implementation of horizontal well fracturing has effectively achieved the anticipated standards for mitigating impact ground pressure and control-ling water damage from the top plate of the layer.
Keywords：horizontal wells on the groundhorizontal fracturingmonitoringmicroseismicfracture propagationimpact ground pressurestratified water damage
Publication Date：2026-02-28
Online Publishing Date：2026-03-12(First online date of this platform, not the publication date of the document)
Pages：9( 164-172 )