Stage cementing collars

Specification,mm

Ф139,7

Ф177,8

Ф244,5

Max O.D.,mm

170

208

283

Drill-out I.D.,mm

122

155

220

Overall length,mm

1082

1182

1222

Rated load,t

140

170

210

Sealing capacity,MPa

25

25

25

Opening pressure,MPa

7

7

7

Opening force,KN

85

136

278

Closing pressure,MPa

5

5

5

Closing force,KN

60

97

199

Lower sliding sleeve.D.

85

115

176

Upper sliding

95

125

197