Study On Evaluation Methods Of Waterfrac Adaptability

Hydraulic fracture technology is a promising stimulation method in a variety of aspects,mainly based on the evaluation of hydraulic fractured wells. Waterfrac treatment technique offers a newmethod for discharging contamination near wells,decreasing waterflood pressure and enhancing injection rate. Waterfrac uses wate(rsometime there is a small amount of proppant) as working fluuid to create fractures in reservoir,has advantages such as low damage,low cost,depth brokendown and fracturing fluid formula is simple,low cost,easy to work..The history of hydraulic fracture technology is reviewed and main influencing factors of hydraulic fracture technology is expatiated. The present situation sand development on hydraulic fracturing technique and its numerical model are briefly reviewed in this thesis. The methodology of simulating the mechanical behaviors of hydraulic fracturing by finite element method is elucidated in detail, the process of hydraulic fracturing propagation is simulated.An indoor rock mechanics test was carried out on natural rock cores and artificial rock cores, in accordacne with the test results, obtaining the dimensionless flow conductivity of different reservoir in the conditon of design-length of cracks. Based on an overall consideration of the influence of crustal stress, Young's modulus , permeability, fracture surface roughness, fracture surface compressing strength, length of crack, equivalent width of crack and so on. Determining the value of Young's modulus of elaticity and permeability, and the dimensionless flow conductivity can be a standard, which can judge whether the reservoir in Daqing is suitable for the water fracturing.