The downhole mud motor is with the drilling fluid (or compressed gases) as the dynamic medium, which is a positive displacement motor. Downhole motor is widely used in construction operations in the oil fields, geology, coal, salt water wells and other industries. Dynamic medium enters the motor of the screw drill from the drill string to form a certain differential pressure at both ends of the motor to propel the motor rotor for rotation and pass the torque and speed to the bit through the cardan shaft.
The downhole mud motor can be used in conjunction with a roller cone bit, diamond drill bit and other special drill bits to make drilling operations in the vertical, directional and horizontal wells.
Basic Parameters and Key Indicators of downhole motor
|
Drill Model
|
OD
|
Flow Rate (L/s)
|
Bit Speed (r/min)
|
Motor Pressure (MPa)
|
Operating Torque ( N.m )
|
Maximum Torque ( N.m )
|
Recommended WOB (kN)
|
Maximum WOB (kN)
|
Maximum Power (kW)
|
Length
|
Connecting Thread ( APIs standard)
|
Weight of Drill (Kg)
|
|
(in)
|
(mm)
|
Top
|
Bottom
|
|
5LZ60×7.0
|
2⅜
|
60
|
1.3-2.8
|
120-250
|
2.5
|
168
|
285
|
5
|
10
|
4.4
|
2.6
|
1.9TBG
|
1.9TBG
|
75
|
|
5LZ73×7.0
|
2⅜
|
73
|
1.3~4.6
|
100~330
|
3.4
|
285
|
485
|
12
|
25
|
9.8
|
3.21
|
2⅜TBG
|
2⅜
|
90
|
|
5LZ89×7.0
|
3½
|
89
|
2-8
|
95-200
|
3.2
|
550
|
960
|
18
|
35
|
11.5
|
3.57
|
2⅜
|
2⅜
|
110
|
|
5LZ95×7.0
|
3¾
|
95
|
5~12
|
140~330
|
4.0
|
1200
|
2100
|
25
|
50
|
41
|
4.45
|
2⅞
|
2⅞
|
140
|
|
5LZ102×7.0
|
4
|
102
|
5-14
|
120-230
|
3.2
|
1700
|
2550
|
40
|
80
|
28
|
5.12
|
2⅞
|
2⅞
|
180
|
|
5LZ120×7.0
|
4¾
|
120
|
8-16
|
90-175
|
4.0
|
1560
|
2730
|
55
|
100
|
29
|
5.85
|
3½
|
3½
|
400
|
|
5LZ127×7.0
|
5
|
127
|
8-18.5
|
80-180
|
4.0
|
1700
|
2950
|
55
|
100
|
32
|
6.20
|
3½
|
3½
|
450
|
|
5LZ165×7.0
|
6½
|
165
|
20~31
|
110~150
|
4.1
|
4800
|
8160
|
80
|
160
|
75
|
6.83
|
4½
|
4½
|
800
|
|
5LZ172×7.0
|
6¾
|
172
|
25~35
|
110~150
|
4.0
|
7600
|
11400
|
100
|
200
|
89
|
8.41
|
4½
|
4½
|
950
|
|
5LZ197×7.0
|
7¾
|
197
|
27~48
|
90~165
|
4.0
|
8420
|
14700
|
160
|
320
|
145
|
8.47
|
5½
|
6⅜
|
1300
|
|
5LZ203×7.0
|
8
|
203
|
27~48
|
90~165
|
4.0
|
8420
|
14700
|
160
|
320
|
145
|
8.47
|
5½
|
6⅜
|
1400
|
|
5LZ216×7.0
|
8½
|
216
|
28~56
|
100~195
|
4.1
|
10500
|
15700
|
200
|
400
|
214
|
8.60
|
6⅜
|
6⅜
|
1500
|
|
5LZ244×7.0
|
9⅜
|
244
|
50~75
|
95~140
|
3.2
|
12700
|
19050
|
210
|
400
|
186
|
7.80
|
6⅜
|
6⅜
|
2000
|
