Large-scale Fracturing Influence Of Research On Sticking

This paper mainly deals Jilin Tian Changling deep oil reservoirs with low porosity andlow permeability, tight sandstone gas reservoirs, horizontal wells require the use oflarge-scale multi-stage fracturing methods to improve well productivity. When themulti-stage fracturing of horizontal wells has changed the original stress distribution aroundthe formation fracturing well, in a multi-stage fracture-induced stress, fracturing wellsadjacent wells around sticking phenomenon occurs repeatedly, causing serious safety hazardsand economic losses. Therefore it is necessary to conduct research on large-scale fracturinginfluence of sticking, so drilling is rational organization, fracturing provide technical support,reduce the incidence of fracturing caused due downhole accidents.The project analyzes the law of large multi-stage horizontal well fracturing effectmechanism of in-situ stress field, based on elasticity theory, a multi-stage fracture-inducedstress field model to analyze the large-scale multi-stage horizontal well fracturing of the samerow in the same direction, the same column with the influence of the adjacent wells inducedstress field; Released from the multi-stage fracturing stress-induced changes in themechanical state of the wellbore adjacent the borehole collapse and cause neckingdeformation made a great start with two angles law fracturing mechanism causing stickingaround well, considering the original stress, borehole orientation and induction changes in thelevel of stress in the establishment of a mechanical wellbore collapse discriminant model andborehole deformation calculation model; Finally, the establishment of large-scale multi-stagefractured horizontal wells adjacent wells borehole shape model to analyze the variation ofdifferent stresses induced by the shape of the horizontal well drilling and the impact on thecard, given the large-scale multi-stage horizontal well pressure crack different stages offracturing conditions hereinafter row in the same direction, the same column in the samedirection adjacent wells drilling safety reasonable distance, combined with csdp8wells,drilling and fracturing the actual data csdp9wells were analyzed examples gives stickingreasons. Horizontal wells through research reveals the impact of large-scale multi-stagefracturing mechanism of stress field, analyzes the impact of large-scale multi-stage fracturingstress field of the law of the land, clear the Changling Denglouku massive gas reservoirfracturing technology well on the influence of sticking around, gives a reasonable distancefracturing and drilling safety, rational organization able to oilfield drilling, fracturing provide theoretical support.