Research On Structure Optimization Of The Horizontal Well Fractured Sand Blast

Sand blast is an important component part of the horizontal well fracturing string. In the fracturing of horizontal wells, with the construction of displ increases, the sand blast wears seriously, packer is difficult to set down, it is difficult to meet the operational requirements for fracturing.In view of the question that the sand fracturing fluid impacts and wears the fracturing sand blast for horizontal wells, Numerical simulation was carried out by using CFD software FLUENT with Euler-Euler method. The simulation of interior flow field of the sand blast is performed by means of Reynolds stress turbulent model, control volume method and SIMPLE arithmetic method. The rules of axial velocity, tangential velocity,pressure distribution cloud,proppant concentration cloud of sand blast inside fluid are gained.It carries out the experiment on testing internal flow field of sand blast with two-dimensional laser Doppler velocimetry. The results show that the overall trend between the numerical simulation and experimental measured data is consistent. It verifies the numerical method.Using numerical simulation method of blasting to optimize the structure of sand blast,the main structural optimization location for the nozzle and the sand blasting mouth. the use of the entrance reducing angle of 30°,the exports expanding angle of 30°is better structural performance. Adjusting the size, location and number to carry on numerical simulation respectively, by analyzing the calculated results, compared to the feasibility of the scheme. Proposing the structure of a ten-hole-non-diameter sand blast to avoid the occurrence of a large eddy current, no matter of flow, velocity and wear resistance are superior to the original structure.This work provides theoretical base and experiences for further research of the structure characteristics and structural optimization design of the the horizontal well fractured sand blast.