鉆頭水力參數(shù)的設(shè)計(jì)

1、鉆頭水力參數(shù)的設(shè)計(jì)1. 變量說明Va假定環(huán)空返速Dh鉆頭直徑Dp 鉆桿直徑C流量系數(shù)Kg 地面管匯B常數(shù) dpi鉆桿內(nèi)徑Lp鉆桿長度upv 鉆井液塑性黏度 ed 鉆井液泥漿密度Lc 鉆挺長度 dci 鉆挺內(nèi)徑 dc 鉆挺外徑Pr 額定泵壓Ps 實(shí)際泵壓Qmin 最低排量Kpi 鉆桿內(nèi)耗系數(shù)Kci 鉆挺內(nèi)耗系數(shù)Kca 鉆挺環(huán)空系數(shù)Kpa 鉆桿環(huán)空系數(shù)Kl 循環(huán)壓耗系數(shù)Qopt最優(yōu)排量Kp 鉆桿壓耗系數(shù)m 單位鉆桿長度的壓耗系數(shù)Kc 鉆挺壓耗系數(shù) a 常數(shù)Dpc 第一臨界井深Dpa 第二臨界井深Qs 泵的實(shí)際排量pl 整個(gè)循環(huán)系統(tǒng)的壓耗系數(shù)Pba 假定鉆頭水功率A0 噴嘴截面積P假定鉆頭水功率Ps

2、 實(shí)際泵壓Nb 實(shí)際鉆頭功率Ns 實(shí)際泵功率V0實(shí)際環(huán)空返速Kv 常數(shù)Kf 常數(shù)Fj 射流沖擊力Pb 實(shí)際鉆頭水功率2. 編程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