Study on the Influencing Factors of CBM Fracturing Fracture Flow Capacity on Hedong Mining Area of Urumqi
The fracture flow capacity is an important indicator reflecting the effectiveness of hydraulic fracturing.CBM in the Hedong mining area of Urumqi has geological characteristics of high dip angle,multiple thick coal seams,and low coal rank.In order to better guide the construction of CBM fracturing in the Hedong mining area of Urumqi,the experimental testing methods were used to study the effects of time,closure pressure,sand concentration,quartz sand proppant particle size and combination on the short-term fracture flow capacity during fracturing.The results show that the flow capacity of different sand laying concentrations decreases with time,with a significant decrease in the first 30 minutes.The decrease in flow capacity slows down with time,with an average decrease of 65%～70%at 75 minutes;Whether it is different proppant particle sizes or different sand concentration,the diversion capacity decreases with the increase of closing pressure.However,when the closing pressure reaches 20MPa,the decreasing trend of the diversion capacity slows down as the closing pressure increases;As the sand concentration increases,the flow capacity increases,and the sand concentration of 7.5kg/m2 is the minimum reasonable sand concentration in this area;The larger the particle size of the proppant,the stronger the flow capacity,but it is also affected by the closing pressure.When the closing pressure is below 15 MPa,the flow capacity of a single 16/30 mesh quartz sand is much higher than that of 20/40 mesh and 40/70 mesh.However,when the closing pressure is above 15 MPa,the flow capacity of the 16/30 mesh and 20/40 mesh combinations is not significantly different,but still far higher than that of the combination containing 40/70 mesh proppant.
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