Prediction of Cuttings-Induced Annular-Pressure Loss in Extended-Reach Wells  

作　　者：Long Wang Qingyun Shen Gui Wang 

机构地区：[1]Key Laboratory of Enhanced Oil Recovery in Fracture-Vug Reservoir,SINOPEC,Urumuqi,830011,China [2]State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,610500,China

出　　处：《Fluid Dynamics & Materials Processing》2023年第11期2877-2890,共14页流体力学与材料加工（英文）

基　　金：supported by the Sinopec Scientific Research Project“Demonstration of Engineering Technology for Ultra-Deep Drilling and Completion in Tarim Basin”(No.P21081-6);the National Natural Science Foundation of China Project“Mesoscopic Simulation of Dynamic Behavior of Bridging Particles Forfractured Thief Zone”(No.51604237).

摘　　要：Drill cuttings are broken bits of solid material removed from a borehole drilled by rotary,percussion,or auger methods and brought to the surface in the drilling mud.When these cuttings enter the annulus,they have an effect on the drillingfluid rheology and density,which is,in general,quite difficult to evaluate.By introducing an empirical correlation for the rheological properties of cuttings-laden drillingfluids,this study proposes a pres-sure-loss prediction method for an extended-reach well(ERW).After verifying the accuracy of this method,a case study is considered and a sensitivity analysis is conducted assuming a yield-power lawfluid.The results show that an increased concentration of cuttings in the annulus contributes to an increased annular pressure loss.Com-pared to their effect on the drillingfluid density,cuttings have a greater impact on the drillingfluid rheology.A larger rate of penetration contributes to an increased annular pressure loss.For higher drillingfluidflow rates,the annular pressure lossfirst decreases and then it increases.In addition,the annular pressure loss becomes high-er as the cuttings’particle size decreases and the cuttings’concentration grows.

关 键 词：Pressure loss CUTTINGS extended-reach well yield-power law model drillingfluid 

分 类 号：TE2[石油与天然气工程—油气井工程]