Study On Hydraulic Fracture Extension Rule For Fractured Reservoir In Tahe Oilfield

The sedimentary environment of fractured reservoir is complex,due to the existence of natural fracture,the results of hydraulic fracturing is largely influenced by natural fracture.In order to carry out accurate construction control and analysis for the fracturing in this kind of reservoir,it is necessary to study the influence of the existence of natural fracture in hydraulic fracturing.Take fractured reservoir in Tahe oilfield as an example,the extension model of hydraulic fracture and natural fracture is established.The model consider the difference about horizontal stress,intersection angle and the rock mechanical parameters of natural fracture,then deduced the fluid loss model of natural facture.And come to the conclusion that,when under the condition of high stress and high angle,hydraulic fracture tend to directly through the natural fractures,less fluid loss influence of natural fracture,in this time,the curve of oil pressure slightly reduce or small fluctuations;when under the condition of low stress and low angle,hydraulic fracture extend in the direction of natural fracture easily,the fluid loss of natural fracture is great,in this time,the oil pressure curve have a great drop.Through the study of the classification of fractured reservoir in Tahe oilfield,put forward the different types of fractured reservoir fracturing operation curve templates,used to judge the fracturing construction characteristics of fractured reservoir and reflect the characteristics of the formation of fracture development.Through the analysis of engineering example for fractured rservoir in Tahe Oilfield reservoir about hydraulic fracturing well and fracturing operation data,Using fracturing operation curve feature template to analyses the change trend of the pressure of the process when hydraulic fracture and natural fracture met,and compared with the model of the hydraulic fracture extension rule.In this paper,the study provides the certain theory reference for hydraulic fracturing with efficient and reasonable development in fractured reservoir.