In the domain of oil drilling, cuttings transport in extended-reach wells is crucial for ensuring safe and economical oil extraction. Cuttings transport is a typical solid-liquid two-phase flow within pipeline systems. The distribution position and accumulation degree of cuttings bed in solid-liquid system is an urgent concern in drilling practice. In recent years, with the application of Along-String Measurements (ASM), it could provide technical support for the acquisition the axial distribution and accumulation degree of cuttings bed by means of multi-measuring point wellbore pressure. Based on the pressure difference method, 76 tests of cuttings transport experiments were carried out on the large indoor flow loop, and multipoint wellbore pressure data were measured in the meanwhile. The effect of cuttings bed axial distribution and accumulation degree under different parameters, such as, drill pipe rotation speed, well inclination, fluid properties and flow rate was studied, and the relationship between multi-measuring point wellbore pressure and cuttings bed dynamic transport was revealed. Based on the mapping relationship between wellbore pressure and cuttings bed transport, a cuttings transport model is established, and the prediction accuracy of this model is over 80%. This study provides a theoretical basis for further popularizing the multi-point pressure technique to invert the cuttings bed distribution.

Solid-liquid two-phase flow,the pressure difference method,drill pipe rotation speed,well inclination,flow rate,cuttings bed dynamic transport