SRD Ratler Series


The Ratler

The original negative pressure pulse vibration device was developed to minimize friction and improve ROP while drilling extended reach wells.

Download The Ratler Series PDF
Graph Notes:

In the graph below you can see that with the negative pulse and low frequency we are able to achieve a larger differential pressure pulse with less of a stand pipe pressure increase.


An axial vibration is produced by a negative pressure pulse that is created by venting fluid to the annulus at a controlled frequency. A shock sub, unique to the Ratler, transmits this negative pulse into a high magnitude axial oscillation, which breaks static friction between the drill string and the annulus wall.


Technical Specifications

Tool ID (SRD-Shock Sub) 5.00” (127 mm) 6.75” (171 mm)
Overall Length 227” (5.67 m) 250” (6.35 m)
Weight 800 lbs. (363 kg) 1,500 lbs. (680 kg)
Low Flow 100-250 gpm (0.38-0.95 m³/min) 300-450 gpm (1.14-1.7 m³/min)
Standard Flow 150-300 gpm (0.57-1.14 m³/min) 300-650 gpm (1.14-2.46 m³/min)
High Flow 300-650 gpm (1.14-2.46 m³/min) 600-900 gpm (2.28-3.41 m³/min)
Maximum Operating Temperature 300°F (150°C) 300°F (150°C)
Operating Frequency 3-4 Hz 3-4 Hz
Operational Pressure Drop Generated 200-400 psi (1,375-2,750 kPa) 250-450 psi (1,720-3,100 kPa)
Max Pull 380,000 lbs. (1,690 kN) 693,000 lbs. (3,083 kN)
Torsional Load To Yield Body Connection 17,000 ft.lbs. (23,050 Nm) 48,000 ft.lbs. (65,080 Nm)
Connections (*Other Connections Available Upon Request) 31/2 IF & 4 FH 41/2 IF

Additional Results

Example 1: Without a Ratler from 9700ft-11400ft depth, slides were on average 6.5% of rotating ROP

Example 2: Series 2 Ratler, from 11400ft-16300ft depth, sides were on average 23.3% of rotating ROP

Example 3: Ratler from 16300ft-19200ft depth, slides were on average 13.3% of rotating ROP


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