Analysis of Main Control Factors of Sand Production in Shale Gas Wells and Countermeasures
With the gradual decrease of formation pressure,proppant backflow and regurgitation occur during the infill adjustment of shale gas fields in Sichuan and Chongqing areas,which on the one hand reduces the conductivity of propped fractures,and on the other hand,proppant enters the ground and brings scouring damage to equipment.In order to control the formation sand production from the source,analyze the main control factors and provide reference for the three-dimensional sand control measures of shale gas wells.By improving the laying profile of proppant,increasing the viscosity of fracturing fluid,optimizing the number of single-stage perforation clusters,adding fibers and other optimization measures,the risk of proppant backflow is effectively reduced;The blowout test system is optimized and adjusted,and the blowout is carried out in order of nozzles from small to large;Aiming at gas wells with different degrees of sand production,a differentiated treatment measure of"one well and one strategy"is formed,and a Swirl filter desander process is put forward.The desander is designed as a whole with"narrow inside and wide outside"in the longitudinal direction,which effectively avoids blocking the fracture cavity,and the desanding efficiency of silty sand with particle size≥0.6 mm reaches 98%.
shale gassand productionnumber of perforation clustersproppantgrit separator
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