Type

0.D of Working

0.D at tow end

Thread

Hole

Driiling String Type

Driiling String Type

WG190.5-26-1600

190

159

NC46

NC46X41/2REG

71/2”

WG200-26-1600

200

77/8”

WG212.7-26-1600

212

159

178

NC46

NC50

NC46X41/2REG

NC50X41/2REG

83/8”

WG215.9-27-1600

215

81/2”

WG222.2-27-1600

83/4”

WG241.3-27-1600

241

178

NC50

NC50X41/2REG

91/2”

WG244.5-27-1600

244

95/8”

WG311.1-38-1900

310

203、229

65/8REG

75/8REG

65/8REG

75/8REG

121/4”

WG375-39-1900

375

229

75/8REG

75/8REG

143/4”

WG444-39-1900

444

229、241

75/8REG

75/8REG

171/2”

WG660-39-1900

660

229、241

75/8REG

75/8REG

26”