Compute equivalent circulating density, flow regime, cuttings loading and the pump-restart connection surge — from your well geometry, mud rheology and flow rate. The model is pre-loaded with a field-validated case: it returns 10.31 ppg against a measured 10.39 ppg (within 0.8%). Change any value to model your own well. 由井身结构、泥浆流变与排量，计算当量循环密度、流态、岩屑加载与接单根开泵激动。已预载一口现场实测井：模型算得 10.31 ppg，实测 10.39 ppg（误差 0.8%）。修改任意数值即可计算您自己的井。
Well geometry井身结构
Operation作业参数
Mud & rheology泥浆与流变
Connection / gel strength接单根 / 静切力
With FECCS continuous circulation, the pump never stops — no gel sets, no restart surge. The bottom-hole ECD stays at the steady value above. 采用 FECCS 连续循环，泵不停转——不结胶、无开泵激动，井底 ECD 始终保持在上方稳定值。
Method: equivalent circulating density ECD = ESD + Pannulus/(g·H), with API RP 13D power-law rheology, cuttings-loading effective density, regime-dependent annular friction loss, and a pump-restart gel-break surge ΔP = 4τ0H/(Dh−Dp). Validated against a field case (model 10.31 ppg vs mud-log 10.39 ppg). For engineering screening and discussion; final hydraulics should be confirmed by the well's drilling-engineering team. © Shenzhen Far East Oil Drilling Engineering Ltd. (FEODE). 方法：当量循环密度 ECD = ESD + P环空/(g·H)，采用 API RP 13D 幂律流变、岩屑加载有效密度、按流态计算的环空摩擦压耗，以及开泵破胶激动 ΔP = 4τ0H/(Dh−Dp)。已用现场实井校核（模型 10.31 ppg vs 录井 10.39 ppg）。供工程初筛与交流，最终水力计算应由该井钻井工程团队确认。© 深圳市远东石油钻采工程有限公司（FEODE）。