Study And Application On Fracture Technology Of Deep Well

Hydraulic fracturing, as an effective stimulation for low permeability reservoir, plays animportant role in the exlporation and development of old field and new low permeabilityreservoir.With the deepening of exploration degree,the Jiangsu Oilfield continued extend tothe deeo,low permeable,difficult layer.The new discovered reservoir mostly are low orsuper-low permeability,which made the stimulation more difficult.For deep well fracturing,many factors led to the difficult in reservoir reformation.In order to meet the developmentrequirements of Jiangsu Oilfield deep well,the paper technically summarise the hightemperature resistance, low friction and low damage fracturing fluid system, deep wellfracturing technology and the crack processing technology,the high temperature resistance,low friction and low damage fracturing fluid system, fracturing fluid delay cross-linkingtechnology and high temperature crack treatment technology.are formed. Fracturing fluid canrate of temperature reach140degrees. Its friction equates to27percent of water friction.Compared with the general fracturing fluid friction, the friction of this fracturing fluiddecreased32.6percent. We can control the fracturing fluid delay time in the rage of3~5minute, and meet the needs of different depths fracturing. The residue treatment formulationtechnology that we researched can reduce the particle size of fracturing fluid residueeffectively, thereby reducing the fractures damage. There are two aspects to using the1percent (NH4)2S2O8and5percent HCl to treat the cracks after fracturing, one hand the impacton the ceramic crushing rates can be reduced, on the other hand, this treatment can damagethe polymer structure in the fracturing fluid, so that polymer can be degraded and the purposeof eradicating pollution in fracture can be achieved. The effect of this field application isevident, and it has full success rate and90percent effective rate.