Research On Proppant Transport Law And Production Of The Shale Gas Reservoir In South Of Pingqiao District Developed By Volumetric Fracturing

The shale gas reservoir in south of Pingqiao district features low porosity,low permeability and low extent of openning for natural fratures.It is treated with the technique of horizontal well segmentation multi-cluster fracturing which creates volumeric fractures and increases stimulated reservoir volumes and production.However,the complexity of fractures leads to the difficulty of proppant transporting in hydraulic fractures during fracturing and sanding stage.Therefore,fractures which are not filled by proppant fail to reach high conductivity and close under formation pressure after pumps stoped.To avoid the increasement of yield below expectation,it is important to research the proppant placement and transport law in fractures.This thesis' s research background is the shale gas reservoir in the south of Pingqiao district and the thesis aims to design a suitable developement program by means of experiments and numerical simulations.The research on proppant placement and transport law in a single fracture and a double fractures model uses a visual plane fracture experimental device which allows researchers to obeserve the shape of sand piles under different conditions including displacements,sand ratios,fracturing fluid viscosities and proppant meshes.Researchers can have an insight into the law by comparing featured parameters of the sand pile.In addition,A CMG numerical model concerning the shale gas reservoir developed by horizontal well segmentation multi-cluster fracturing is created to simulate the production of the reservoir treated by hydraulic fracturing with different numbers,lengths,spacings and conductivities of fractures.The mean of orthogonal experiment has been employed to confirm the influence level and optmization of fracture parameters,Moreover,a special module,the complex fractures module has been used to simulate the increasement of yield by setting different stimulated reservoir volumes and conductivities of fracture network.Finally,the optimization of displacments and fracturing scale has been achieved by the means of Meyer simulation.The research result can guide hydraulic fracturing on site to some extent,which can boost the development of the shale gas reservoir in south of Pingqiao district.