水力參數(shù)計算

1、Equation for calculating hydraulics1. 噴 嘴壓降(pressure drop across bit nozzle)B= W Q2/10858A2B:噴嘴壓降(pressure drop across bit nozzle): PSI。 W :泥漿密度(mud weight): PPG。Q:泵排量(flow rate): GPM。2A :噴嘴總面積(total flow area): in 。2. 近似的塑性粘度(estimated plastic viscosity)PV=0.1W 2J6PV:近似的塑性粘度(estimated plasticviscos

2、ity): CP。(厘泊) W :泥漿密度(mud weight): PPG。3. 鉆頭水功率(bit hydraulic horsepower)BHP=Q*B/1714BHP:鉆頭水功率(bit hydraulic horsepower):H P。 Q:泵排量(flowrate): GPM。B:噴 嘴壓降(pressure drop across bit nozzle): PSI。4. 噴嘴噴速(Nozzle velocity)NV=0.32086Q/ANV:噴 嘴噴速(Nozzle velocity): FPS。 Q:泵排量(flowrate): GPM。2A:噴嘴總面積(total fl

3、ow area): in 。5. 沖擊力(impactforce)IF=NVWQ/1932IF:沖擊力(impact force): lbs。W :泥漿密度(mud weight): PPG。 Q:泵排量(flow rate): GPM。6. 管內(nèi)平均流速(averagevelocity insidepipe)VP=24.5Q/12I2VP: 管內(nèi)平均流速(average velocity inside pipe) :FPM。 Q :泵排量(flow rate): GPM。I: 管內(nèi)徑(pipe inside diameter):in.7. 管內(nèi)臨界流速(critical velocity i

4、nside pipe)VCP=1.08PV+1 08(PV2+93 I2YPW) 0.5/W 4Plastic fluid model(塑性流體)Assumes turbulence when REYNOLDS number>=2000(雷諾數(shù) >=2000 為紊流)VCP:管內(nèi)臨 界流速(critical velocity inside pipe):FPS。PV:近似的塑性粘度(estimated plastic viscosity)： CP。(厘泊)W :泥漿密度(mud weight)： PPG。I : 管內(nèi)徑(pipe inside diameter): in。2YP：屈服

5、點(diǎn)(yield point):lbs/100 in8. 管內(nèi)壓力損失(pressure loss inside pipe)(1). VP<VCP 層流(laminar flow)PL=( L YP/225 d)+( VPLPV/1500 d2)(2). VP水利計算公式DP?=1一3210t ” L?' Q86d?必6DP?i = 1.32_，r ' L?i ，Q1.86 d?i 486DP? ? =4321(4' r' L? ' Q2(D- D? )3 ' (D + D? )2'r ' L3 ' Q24.32 ' 104(D- D3)3 ' (D + D3)2DP，= r ' Q 2 ' 10 31 .78 ' A 氷 2r ' 103 1 .78 ' DP 氷V氷=1000 'Q-W? (3