DR-88.NGT.7/8.27.M1

Description

PDM DR-88.NGT.7/8.27.M1 is a new universal hydraulic downhole motor used for:

• drilling of oil and gas wells with 98.4 – 120.6 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 1025 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 3M glue, and each motor is complete 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	88/89
Power section lobe configuration	7/8
PDM length, mm	4 581
Length of stator rubber lining, mm	2 736
Length of bearing section up to a curvature point, mm	1 025
Diameter of bits used, mm	98,4-120,6
Connecting thread to drill pipes	З-66
Connecting thread to bits	З-66
Maximum density of drilling mud, g/cm3	1,6
Allowed axial load, kN	50
Weight, kg	162

 
Power specification

Working fluid flow rate, l/s	2,8-8,2
Output shaft rotation speed:
- in no-load conditions, RPM	74-215
Torque at maximum power, kN*m	1,34
Pressure drop:
- at maximum power, MPa	4,3
Power, kW	28

Outline drawing

Comparison
of specifications

Parameter

Technical specification:

Housing OD, mm

Power section lobe configuration

PDM length, mm

Length of stator rubber lining, mm

Length of bearing section up to a curvature point, mm

Diameter of bits used, mm

Connecting thread to drill pipes

Connecting thread to bits

Maximum density of drilling mud, g/cm3

Allowed axial load, kN

Weight, kg

Power specification:

Working fluid flow rate, l/s

Output shaft rotation speed:

- in no-load conditions, RPM

Torque at maximum power, kN*m

Pressure drop:

- at maximum power, MРa

Power, kW

DR-88.NGT.5/6.20.M1	DR-88.NGT.5/6.24.M1	DR-88.NGT.7/8.27.M1
88	88/89	88/89
5/6	5/6	7/8
3 845	4 245	4 581
2 000	2 400	2 736
1 025	1 025	1 025
98,4-120,6	98,4-120,6	98,4-120,6
З-66	З-66	З-66
З-66	З-66	З-66
1,6	1,6	1,6
50	50	50
137	151	162
5-7	4,3-12,8	2,8-8,2
270-400	108-325	74-215
1,1-1,3	1,53	1,34
10-13	4,5	4,3
27-43	47	28

Download

Description and specification of DR-88.NGT.7/8.27.M1 (0.3 MB, pdf)