钻头水力参数的设计

1、钻头水力参数的设计1. 变量说明Va假定环空返速Dh钻头直径Dp 钻杆直径C流量系数Kg 地面管汇B常数 dpi钻杆内径Lp钻杆长度upv 钻井液塑性黏度 ed 钻井液泥浆密度Lc 钻挺长度 dci 钻挺内径 dc 钻挺外径Pr 额定泵压Ps 实际泵压Qmin 最低排量Kpi 钻杆内耗系数Kci 钻挺内耗系数Kca 钻挺环空系数Kpa 钻杆环空系数Kl 循环压耗系数Qopt最优排量Kp 钻杆压耗系数m 单位钻杆长度的压耗系数Kc 钻挺压耗系数 a 常数Dpc 第一临界井深Dpa 第二临界井深Qs 泵的实际排量pl 整个循环系统的压耗系数Pba 假定钻头水功率A0 喷嘴截面积P假定钻头水功率Ps

2、 实际泵压Nb 实际钻头功率Ns 实际泵功率V0实际环空返速Kv 常数Kf 常数Fj 射流冲击力Pb 实际钻头水功率2. 编程Private Sub Command1_Click()Va = 0.8Dh = 21.59Dp = 17.78C = 0.98Kg = 0.00107B = 0.51655dpi = 10.86Lp = 3880upv = 0.0047ed = 1.64Lc = 120dci = 7.14dc = 17.78pr = 16.5Ps = 14.85Qr = 35.4Qmin = 0.1 * 3.14 * (Dh A 2 - Dp A 2) * Va / 4Kpi = (

3、ed a 0.8 * upv a 0.2 * Lp * B) / (dpi a 4.8)Kci = (ed A 0.8 * upv A 0.2 * Lc * 0.51655) / (dci A 4.8)Kca = ed A 0.8 * upv A 0.2 * Lc * (0.57503) / (Dh - dc) A 3 * (Dh + dc) A 1.8)Kpa = ed A 0.8 * upv A 0.2 * Lp * (0.57503) / (Dh - dc) A 3 * (Dh + dc) A 1.8)Kl = Kg + Kpi + Kci + Kca + KpaQopt = (Ps /

4、 (2.8 * Kl) A (1 / 1.8)If Qopt Qr ThenQs = QrElseQs = QoptEnd Ifpl = Kl * Qs A 1.8Pb0 = Ps - plA0 = (ed * Qs A 2) / (20 * C A 2 * Pb0) A (0.5)Pb = (ed * Qs A 2) / (2 * C A 2 * A0 A 2)Text1.Text = PbPs = Pb + plText2.Text = PsNb = Pb * QsNs = Ps * QsText3.Text = NbText4.Text = NsRj = Nb / NsText5.Tex

5、t = RjVa = 0.1 * Qs * 4 / (3.14 * (Dh A 2 - Dp A 2)Text6.Text = VaKv = 10 * C * (20 / ed) A 0.5)V0 = Kv * (Ps - pl) A 0.5 * 0.001Text6.Text = V0Kf = (C * (20 * ed) A 0.5) / 100Fj = Kf * Qs * (Ps - pl) A 0.5Text7.Text = Fjrwj = Nb / (A0 * 10000)Text8.Text = rwjEnd SubPrivate Sub Command2_Click()Text1.Text = Text2.Text = Text3