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| COUPLED MODEL OF SEEPAGE AND PIPE-FLOW FOR SAND PRODUCTION FROM BIG CHANNEL IN UNCONSOLIDATED RESERVOIR |
| Liu Jianjun1，2，Pei Guihong1，Li Jixiang1，Luo Sijing1 |
| (1Institute of Poromechanics，Wuhan Polytechnic University， Wuhan 430023 China) (2Institute of Rock and Soil Mechanics，The Chinese Academy of Sciences， Wuhan 430071 China) |
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Abstract A coupled model of seepage and pipe-flow for sand production from big channel in unconsolidated reservoir is deduced based on fluid mechanics and rock mechanics. The fluid flow in reservoir is assumed to obey Darcy’s law and mass conservation law. The flow in big channel is fluid-solid two-phase flow，and it observes Navier-Stokes equations. The coupled relations between seepage and pipe-flow are obtained based on flux and pressure conditions. Threshold sand-production flow rate and sand flaking equation are given by experimental results. Using the above model，big channel propagating in a rectangle zone is simulated，in which a production well and a water well are located. Through simulation，the pressure distribution in flow filed and sand-production curves are achieved. According to simulation results，influencing factors of sand production，such as fluid viscosity and production rate，are analyzed.
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2004, Vol. 23 
