Testing Study Of Hydrofracturing Simulation Of Binnan Oilfield

Hyduralic fracturing technology is one of economic and effective means to enhance the lowpeameability reservoir production. As the primary factor of influencing the initiation and propagation of fracture, in-situ stess plays an important role on the initiation and propagation of fracture, and controls the position of initiation and the process of propagation. At the same time, perforation and inartificial fractures are also the main factors of influencing initiation and propagation of fracture, the being of them changes the initiation position and the patulous process. Therefore, the influencing factors are considered, including of in-situ stress, perforation form, inartificial fractures and porepressure.Basing on the geological background and in-situ stress measurement of Binnan oil field, the dissertation is a study on the influence of perforation and pre-fractures to the initiation and propagation pressure by the methods of finite element method and physical simulation experiment. And the continuous damage mechanics theory was applied in hydraulic fracture models and could make the results of fracture simulation meet actual conditions more.The major work is as follows:The information of geological background and developing state of Binnan oil field are collected, the evolvement process and exploitation actuality of area are known. At the same time, some works of spot are done, including acquiring the location of wells, injection and extraction state, the flow chart and the parameter of construction.The in-situ state of the area are measured by many methods, including acoustic emission method, well-bore break method, hydraulic fracturing method, mic-earthquake method, electrical method etc, the state of in-situ stress is mastered. It can provide evidence for the hydraulic fracturing construction and arrangement of well net. at the same time, it provides boundary condition for finite element method and physical modeling test.Basing on the test of rock mechanics, ANSYS finite element software is used to modeling hydraulic fracturing process, and the data of area Bin660 and Li853 is computed. Simulation results help to understand the impact of in-situ stresses, direction of perforation, quantity of perforation, diameter of perforation and depth on initiation hydraulic fracturing pressure, provide basic data for the design and construction of hydraulic fracturing. And the flow-deformation coupling model by FEPG finite element software can do some investigation on the propagation law about hydraulic fracturing, and the dynamic extension process can be observed.In order to validate the correctness of finite element methods, actual model are made by us. And the physical simulation experiment is carried out in door, the true hydraulic fracturing figures are modeled by it. The dependability of finite element methods are improved by the extension direction of fractures.By contrasting the results of finite element methods and Physical simulation experiment, the intrinsic affiliation of in-situ stress, directional perforation and the start and extension of hydraulic fracturing are found ,and the appropriate well is selected on spot, receiving preferable effect.