Expansion of blades into operating position is provided by the effect of differential fluid pressure in reamer body

Underreamers

RR type underreamers are designed for enlarging any interval of wellbore (for liners, profile shutter, repair and insulation work intervals) in soft and medium hard formations.

RR H type underreamers are designed for reaming while drilling as a part of BHA comprising pilot drill bit or previously drilled interval.

RR Sp type underreamers are designed for carrying out special operations in openhole intended to form a cavity within a wellbore for further intentional sidetracking from original hole.

Expansion of blades, equiped with high quality PDC cutters, into operating position is provided by the effect of differential fluid pressure between flowbore and wellbore annulus.

Delivery set of all types of underreamers includes back pressure valve which prevents tool from sludging during round-trip operations and interchangeable blades easily replaceable in rig conditions, significantly reducing repair and maintenance costs.

Tool series

Body / centralizer diameter, mm

Opening diameter, mm

Overall length, mm

Connection thread

GOST
28487-90

API

RR

RR-94-142-1

88 / 94

142

1,216

Z-66

2 ⅜ Reg

RR-105-132-1

105 / 114

132

1,337

Z-86

NC-31

RR-115-226-1

115 / 116

226

1,295

Z-86

NC-31

RR-118-127-1

114 / 118

127

1,480

Z-86

NC-31

RR-118-130-1

114 / 118

130

1,480

Z-86

NC-31

RR-118-137-1

114 / 118

137

1,480

Z-86

NC-31

RR-118-146-1

114 / 118

146

1,480

Z-86

NC-31

RR-118-152-1

114 / 118

152

1,480

Z-86

NC-31

RR-118-156-1

114 / 118

156

1,480

Z-86

NC-31

RR-120-192-1

114 / 118

192

1,294

Z-86

NC-31

RR-120-226-1

114 / 118

226

1,294

Z-86

NC-31

RR-122-156-1

122 / 142

156

1,503

Z-86

NC-31

RR-132-168-1

132 / 142

168

1,685

Z-102

NC-38

RR-132-226-1

121 / 136

226

1,420

Z-102

NC-38

RR-138-175-1

138 / 148

175

1,747

Z-102

NC-38

RR-138-190.5-1

138 / 160

190.5

1,386

Z-102

NC-38

RR-138-215.9-1

130 / 139

215.9

1,368

Z-102

NC-38

RR-138-226-1

138 / 142

226

1,366

Z-102

NC-38

RR-138-240-1

138 / 142

240

1,366

Z-102

NC-38

RR-138-280-1

138 / 142

280

1,366

Z-102

NC-38

RR-185-240-1

185 / 212

240

1,694

Z-147

5 ½ FH

RR-185-310-1

185 / 212

310

1,694

Z-147

5 ½ FH

RR-185-380-1

185 / 212

380

1,694

Z-147

5 ½ FH

RR H

RR-118-132H

118 / 118

132

1,194

Z-86

NC-31

RR-118-146H

118 / 118

146

1,194

Z-86

NC-31

RR-118-156H

118 / 118

156

1,194

Z-86

NC-31

RR-138-175H

138 / 148

175

1,230

Z-102

NC-38

RR-158-194H

158 / 161

194

1,250

Z-133

NC-50

RR-208-226H

208 / 212

226

1,475

Z-147

5 ½ FH

RR-208-240H

208 / 212

240

1,475

Z-147

5 ½ FH

RR Sp

RR-78-120 Sp-1

78 / 82

120

1,022

Z-66

2 ⅜ Reg

RR-118-156 Sp-1

114 / 118

156

1,480

Z-86

NC-31

RR-138-200 Sp-1

138 / 141

200

1,747

Z-86

NC-31