DR-120.NGT.7/8.59.М2

Description

PDM DR-120.NGT.7/8.59.М2 is a new universal hydraulic downhole motor used for:

• drilling of oil and gas wells with 139.7 – 165.1 mm bits,
• well reconstruction by sidetracking with rock bits, PDC bits, including bicentric ones;
• well workover operations.

An adjustable bent sub is placed between bearing section and power section. The adjustment range is between 0° and 2° or between 0° and 3°.

Bearing section has axial multi-row rolling bearing and radial hard alloy bearings. Due to a very short shoulder up to the point of axes misalignment (only 1370 mm) drillers can:

• perform tripping without significant pressing of a bit to internal walls in the production string;
• perform sidetracking of complex profile where it is required to alternate deviated intervals of more than 5°/10 m built rate and stabilization intervals with rotation of a drill string without the assembly tripping-out to replace the bend angle.
• minimize risk of leaving the motor parts in the well, as all the threads are screwed applying Loctite glue, and each motor is completed with safety sub.
• do a large volume of work with one motor (it is especially important for hard-to-reach regions) as the overhaul life reaches approximately 200 hrs.

Technical and power
specifications

Technical specification

Housing OD, mm	120
Power section lobe configuration	7/8
PDM length, mm	8 237
Length of stator rubber lining, mm	5 900
Length of bearing section up to a curvature point, mm	1 370
Diameter of bits used, mm	139,7-165,1
Connecting thread to drill pipes	З-102
Connecting thread to bits	З-88
Maximum density of drilling mud, g/cm3	1,6
Allowed axial load, kN	100
Weight, kg	545

 
Power specification

Working fluid flow rate, l/s	12-25
Output shaft rotation speed:
- in no-load conditions, RPM	130-261
Torque at maximum power, kN*m	5,3
Pressure drop:
- at maximum power, MPa	5,2-7,3
Power, kW	122

Outline drawing

Comparison
of specifications

Parameter	DR-120.NGT.6/7.30.М2	DR-120.NGT.7/8.59.М2
Technical specification:
Housing OD, mm	120	120
Power section lobe configuration	6/7	7/8
PDM length, mm	5 407	8 237
Length of stator rubber lining, mm	3 000	5 900
Length of bearing section up to a curvature point, mm	1 370	1 370
Diameter of bits used, mm	139,7-165,1	139,7-165,1
Connecting thread to drill pipes	З-102	З-102
Connecting thread to bits	З-88	З-88
Maximum density of drilling mud, g/cm3	1,6	1,6
Allowed axial load, kN	100	100
Weight, kg	358	545
Power specification:
Working fluid flow rate, l/s	10-20	12-25
Output shaft rotation speed:
- in no-load conditions, RPM	162-324	130-261
Torque at maximum power, kN*m	4,7	5,3
Pressure drop:
- at maximum power, MРa	9,0-13,5	5,2-7,3
Power, kW	101	1

Download

Description and specification of DR-120.NGT.7/8.59.М2 (0.3 MB, pdf)