NRST Spiro-Torq® - Torque Reduction Tool

(Non -Rotating Sleeve Type)


NRST Spiro-Torq® - Torque Reduction Tool

The NRST Spiro-Torq is an industry leading drilling tool which provides significant down hole torque reduction. In addition, the tool also ensures casing wear protection as well as drill pipe protection. This can be is achieved in even the most challenging of well conditions, such as:

  • HP/HT Drilling
  • Extended Reach Drilling
  • Horizontal Drilling
  • Geothermal Drilling
  • Deep water Drilling

For just over 25 years, Drilltech Group has been fully certified to supply our patented drilling technology to the Oil & Gas industry. Within this period, we’ve successfully helped several major operators reach complex drilling targets – in a safe, timely and cost effective manner.

The NRST Spiro-Torq has a simple yet very robust all steel design. No rubbers, elastomers or ball bearings are included. The tool has a proven track record in withstanding side loading in excess of 10,000 lbs and to this day, remains 100% fail safe.

The tool can run down hole for long periods of time and as standard, a minimum 350 hours of rotation is guaranteed. At this point we would suggest inspecting each tool. However to date, a record of over 1,000 rotating hours has been achieved without impacting on performance.

Although recommended for the cased hole, the NRST design does allow the tool to be run for short duration in the open hole, until the bit change/trip out. For all open hole drilling issues however, please consider Drilltech’s IT (Integral Type) SpiroTorq Tool. Like the NRST Spiro-Torq, it offers a proven and trustworthy solution against drill string wear. In addition, it also addresses issues such as differential sticking and inadequate hole cleaning.

How is torque reduction achieved?

The NRST Spiro-Torq Tool is available with varying connections ranging from 3 1/2″ OD to 6 5/8″ OD, and incorporates a steel one piece mandrel and non-rotating sleeve.  The OD of the sleeve is slightly larger than the tool joint of the drill pipe. When run down hole, it creates a stand-off  between the drill string and casing ID. This allows the drill string to rotate freely without wearing against the casing. In doing so, significant torque reduction is achieved as well as drill pipe protection and casing wear protection.

Each Spiro-Torq Tool is placed into the drill string as if they were a standard crossover sub. Placement is dependent on the severity of the drilling conditions, however as standard, a ratio of one tool per stand is normally required. Due to the simplicity of the tool’s make up procedure, existing rig crews are more than capable of placing the Spiro-Torq® Tool within the drill string. This removes the need for Drilltech to supply costly service engineers, reducing both client cost and potential health and safety risks.

Free Torque and Drag Analysis

In addition to the supply of our NRST Spiro-Torq Tools, Drilltech also offer free torque and drag analysis. This is to determine placement and just how beneficial our tools can be under your own particular set of drilling conditions. No obligation to rent is attached to this service and if of interest, please feel free to contact Drilltech, along with the following information:

A. Well Trajectory (Actual plus planned ) MD, Inc, Azi (in MS Excel or .txt file please)
B. Casing Info (setting depths size weight)
C. BHA and string component info
D. Mud Properties (MW, YP, PV)
E. Predicted Bit run length prior to bit change

Major advantages of NRST Spiro-Torq® Tools
•  Significantly reduces casing wear.
•  Significantly reduces down hole torque.
•  Significantly reduces wall contact.
•  Significantly reduces drill pipe tool joint wear.
•  Unaffected by use of any type of wellbore fluids.
•  Can be utilised in standard, HP/HT, ERD and geothermal drilling conditions.
•  No costly service engineers required on site.

Key features of NRST Spiro-Torq® Tools:
•  Main mandrel is one piece made from 4145H modified steel.
•  Sleeve is a non-rotating one-piece item made from 4140H steel.
•  No rubbers, elastomers or bearings are used in the design of the tool.
•  Low co-efficient of friction chromium alloy on both sleeve and mandrel stress area.
•  Manufactured in accordance with the latest NS1 specifications.
•  Inspected to the latest NS2 and DS1 criteria as per customer requirements.
•  Range of connections, covering both API and high torque types, from NC38 through to 6 5/8 FH
•  Mud lubricated

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