1. Control drilling dynamics by eliminating damaging torsional oscillations (stick slip) generated from the bit and/or an underreamer

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Control drilling dynamics by eliminating damaging torsional oscillations (stick slip) generated from the bit and/or an underreamer 2.

1 AST Overview The Tomax Anti Stick Slip (AST) tool is a downhole mechanical device for drilling optimisation. The technology has been commercial since 2007 and to date has a track record of over 1000 runs with more than 2.5 million feet drilled. The benefits an AST can deliver: 1. Control drilling dynamics by eliminating damaging torsional oscillations (stick slip) generated from the bit and/or an underreamer 2. Improve drilling efficiency, increase ROP and reduce cost per foot The tool adjusts the depth of cut dynamically to maintain a constant torque on the bit. This permits the use of sharper more aggressive cutting structures to maximise ROP 3. Protects expensive downhole BHA components & bits from shock related failures 4. De-risk your operations particularly in high cost operations (e.g. deepwater).

The tool is normally positioned at the top of the non magnetic drill collars in the BHA so has no impact on system steering capabilities.

The tool is plug and play therefore there is no requirement for a service hand.

AST runs with RSS systems 34% 2% 23% AutoTrak (BHI) PowerDrive/Exceed (SLB) Geopilot(HAL) Revolution/Wellguide (WFT/Gyrodata) 41% % runs by

2 The tool is normally positioned at the top of the non magnetic drill collars in the BHA so has no impact on system steering capabilities. The tool can be used with any drilling system in all well types and profiles. The majority of runs (>80%) are with RSS systems. The tool is plug and play therefore there is no requirement for a service hand. The charts below illustrate the percentage of runs with various RSS systems and by well type. AST runs with RSS systems 34% 2% 23% AutoTrak (BHI) PowerDrive/Exceed (SLB) Geopilot(HAL) Revolution/Wellguide (WFT/Gyrodata) 41% % runs by well type 29% 25% Vertical Deviated Horizontal 46% The drilling tool is a simple, robust design and has applications in all well types from vertical exploration to ERD Can be used with all drilling systems Available in sizes from 4 ¾, 6 ¾, 8 ¼ & 9 ½ Link to website:

3 ANTI STICK-SLIP TECHNOLOGY FOR SUB-SURFACE DRILLING APPLICATIONS STRINGERS ENLARGEMENT ROUGH SEAS PERFORMANCE INTERVENTION

4 ANTI STICK-SLIP TECHNOLOGY Autonomous systems for optimizing stability in extreme situations have become everyday technology in modern automobiles. Tomax AS has adapted this technology for oilwell drilling applications through the company s patented Anti Stick-Slip Technology (AST).

However, if the bit becomes unstable, the AST will intervene to regulate the forces and the bit s depth of cut.

5 FUNCTIONAL PRINCIPLE The AST consists of a mechanical-hydraulic converter placed in the lower part of the drill string. Under normal, stable conditions, the unit will transfer torque and weight to the bit as a passive part of the Bottom Hole Assembly (BHA). However, if the bit becomes unstable, the AST will intervene to regulate the forces and the bit s depth of cut. In practical terms, this means that the momentary response/closed-loop function of the AST prevents the escalation of local instabilities into destructive vibrations. The tool functions continuously, and no reset is required.

STABILITY DOWNHOLE The value of Anti Stick-Slip Technology has been proven through a wide variety of downhole challenges, where the AST tool has prevented destructive vibrations while increasing

6 STABILITY DOWNHOLE The value of Anti Stick-Slip Technology has been proven through a wide variety of downhole challenges, where the AST tool has prevented destructive vibrations while increasing penetration rates through improved drill bit efficiency. The technology is applicable for all types of drilling and milling operations and is equally suitable for use in vertical and deviated wells.

7 Increasing bit torque from the rock/ cutter interface will cause the AST to contract, offloading the weight on bit and reducing the depth of cut. The tool will then extend and reapply weight to deliver a steady load. WITH AST WITHOUT AST

9 ANTI STICK-SLIP IMPLEMENTATION Use of the AST requires no changes to standard drilling practices. The tool has a wide working range, which eliminates the need for time consuming surface parameter adjustments. Use of the AST does not require the presence of on-site service personnel.

AST VALUE The value gained will depend on the original level of disturbances.

The test was carried out in accordance with scientific standards with third party data validation, and comparative runs were made with identical bits and BHAs.

Search for AST Comparison or scan the QR code to watch.

10 AST VALUE The value gained will depend on the original level of disturbances. In order to find nominal values for the effect of the technology, a leading offshore oilfield operator conducted a comparative test at the International Research Institute of Stavanger (IRIS). The test was carried out in accordance with scientific standards with third party data validation, and comparative runs were made with identical bits and BHAs. The weight on bit was increased incrementally through a continuous rock interval. AST COMPARISON A video from the test is available on YouTube.com. Search for AST Comparison or scan the QR code to watch. ULRIGG TEST REFERENCE ROP (m/hr) WOB (mt) ROP SSLIP WOB SSLIP delta RPM Time(sec) BITS AFTER RUN ULRIGG TEST WITH AST ROP (m/hr) WOB (mt) ROP SSLIP WOB SSLIP delta RPM Time(sec) The result from Ullrig was an average vibration reduction to half of the reference levels, while the penetration rate increased by %, depending on parameters. The Ullrigg tests were conducted by the International Research Institute of Stavanger (IRIS). BITS AFTER RUN

WELL SPECIFIC VALUE The preventive work performed by the AST to maintain steady, fast progress in a particular

This tool has a built-in sensor, which is calibrated to measure the actual stroke of the tool and work performed.

prevent the initiation of severe vibrations.

11 WELL SPECIFIC VALUE The preventive work performed by the AST to maintain steady, fast progress in a particular application can be determined through the use of an instrumented version of the AST tool. This tool has a built-in sensor, which is calibrated to measure the actual stroke of the tool and work performed. AST TOOL STROKE Actual tool stroke measured in inches versus time reveals the work the AST has performed in order to prevent the initiation of severe vibrations. 12:00:00 12:18:41 12:37:22 12:56:03 13:14:44 13:33:25 13:52:06 14:10:47 14:29:28 14:48:09 15:06:50 15:25:31 15:44:12 16:02:53 16:21:34 16:40:15 16:58:56 17:17:37 17:36:18 17:54:59 0,00 1,00 2,00 Stroke (inches) 3,00 4,00

12 PLACEMENT IN BHA The optimum placement of the AST tool is on top of the non-magnetic portion of the BHA. This is the same for rotary steerable systems, downhole motors and rotary assemblies.

13 BHA configurations examples for RSS/Under Reamer BHA RSS/LWD BHA and motor BHA. For hard rock and high friction formations, a roller reamer above the AST is recommended.

14 CASE EXAMPLE MAINTAINING A SHARP EDGE IN HARD ROCK In hard stringers, more force is required to engage the cutters. As a result more heat is generated, thereby reducing the wear and impact resistance of PDC cutters. The inclusion of an AST tool in the BHA allows the use of more aggressive cutting structures to maximize drilling efficiency in terms of increased penetration rates and PDC durability. The efficiency of a drill bit is generally determined by how sharp the cutter is. A sharp cutter requires less force to engage the rock and consequently creates less friction. TIME-DEPTH CURVES DAYS OFFSET AGGRESSIVE BIT AND AST The graph shows the radical ROP and durability potential in replacing the conventional heavy set bits with an aggressive PDC bit and AST. In this example the cutters used had minimal chamfer and drilled the entire section in one run. The geology was a mixture of shales and hard carbonates in the Central North Sea.

CASE EXAMPLE REMOTE DEEPWATER EXPLORATION No operation has a higher spread rate or is more reliant upon equipment performance than remote, deepwater exploration.

15 CASE EXAMPLE REMOTE DEEPWATER EXPLORATION No operation has a higher spread rate or is more reliant upon equipment performance than remote, deepwater exploration. In certain areas these operations also have to deal with rough seas. New discoveries in the offshore East Africa region are now being appraised from high cost deepwater drillships. The lead operators in the area all use AST technology to minimize the risk of vibrations and optimize the rate of penetration. The value of the AST tool in these areas has been repeatedly demonstrated in the first eight wells drilled, where trips were only made for casing or coring operations. OPERATIONAL (DOWNHOLE) RELIABILITY PRODUCTIVITY (%) DAYS WELL 1 WELL 2 WELL 3 WELL 4 WELL 5 WELL 6 WELL 7 PRODUCTIVITY (DOWNHOLE TOOLS) DRILLING DAYS 0

MAXIMUM BENEFIT FROM PDC Analysis of vibrations from modern drilling systems tends to reveal borehole friction as an increasingly important factor.

16 MAXIMUM BENEFIT FROM PDC Analysis of vibrations from modern drilling systems tends to reveal borehole friction as an increasingly important factor. High friction results in the energy being bounced back up the string. The phenomenon is typically encountered when the Polycrystalline Diamond Compact (PDC) cutters are loaded up to engage hard stringers Transverse Strength (GPa) TSP PDC The AST will greatly improve the benefit from PDC technology by allowing the use of more aggressive cutters that require less weight on bit. In addition to a reduction in vibrations, friction is reduced with less heat generated at the cutter interface, resulting in increased energy efficiency. Heat is the most important factor contributing to wear and impact resistance of PDC cutters Temperature ( C) The PDC cutter has a great strength advantage over the rock when cool (2.4 Gpa or psi), but the strength takes a dramatic dive with increased temperature. The main source of heat in the drilling situation is friction which implies low friction results in longer bit life. NO STALLS WITH DOWNHOLE MOTORS With the AST positioned above a drilling motor, any sudden reactive torque will cause the AST tool to immediately contract, reducing weight on bit and preventing the bit or mill from stalling. This function saves both time and equipment. Additional value is gained from reduced fatigue cycles in coiled tubing operations and a more controllable toolface orientation with steerable motors. With an effective system for preventing stalls, the safety margin on the motor differential pressure can be lowered, enabling higher load limits with longer, more efficient runs.

CERTIFIED BRANCHES USA BRAZIL NORWAY UK All branches of Tomax are certified in accordance

Box 332, Forus NO-4067 STAVANGER NORWAY Call: +47 51 95 11 70 Email: tomax-norway@tomax.

2nd Floor East Wing, Migvie House, 23 North Silver Street, Aberdeen, AB10 1RJ, UK Call:

17 CERTIFIED BRANCHES USA BRAZIL NORWAY UK All branches of Tomax are certified in accordance with ISO by Det Norske Veritas. NORWAY Tomax AS Travbaneveien 1, Forus P.O. Box 332, Forus NO-4067 STAVANGER NORWAY Call: UK Tomax UK Ltd. 2nd Floor East Wing, Migvie House, 23 North Silver Street, Aberdeen, AB10 1RJ, UK Call: +44 (0) USA Anti Stick-Slip Technology LLC 4103 Chance Lane, Rosharon, TX USA Call: BRAZIL Tomax do Brasil Av. Das Américas 3500/328 bloco Toronto 4, Cep: Barra da Tijuca, Rio de Janerio RJ, BRASIL Call: (21)

18 9½ X-series AST TOOL SPECIFICATIONS: PARAMETER METRIC IMPERIAL Length 3.44m Stroke 0.15m 6 Max. OD 241mm 9.5 Min. ID 72mm 2 13/16 Mass kg lbs Max. WOB operational 45 kdan 100 klbs Max. downhole torque 68 knm 50 kftlbs Max. RPM As recommended from bit manufacturer As recommended from bit manufacturer Ultimate tensile load 536 kdan 1180 klbs Operational tensile load 280 kdan 616 klbs Max. internal pressure 690 bar psi Max. hydrostatic pressure 2000 bar psi Max. pump rate 6000 lpm 1600 GPM Max. sand content 1 % 1% Max. DLS operational 14 deg/30m 14 deg/100ft Max. temp. operational 200C 390 F Connection top API 7 5/8 REG box API 7 5/8 REG box Make up torque Nm ftlbs Connection bottom API 7 5/8 REG pin API 7 5/8 REG pin Make up torque Nm ftlbs Configurations: XD = Standard XB = Pressure balanced

19 8¼ X-series AST TOOL SPECIFICATIONS: PARAMETER METRIC IMPERIAL Length 4,23m 13,87 Stroke 0,25m 9,4 Max. OD 209,6mm 8,25 Min. ID 72mm 2,83 Mass 820 kg lbs Max. WOB operational 45 kdan 100 klbs Max. downhole torque 48 knm 35 kftlbs Max. RPM As recommended from bit manufacturer As recommended from bit manufacturer Ultimate tensile load 512 kdan klbs Operational tensile load 260 kdan 572 klbs Max. internal pressure 690 bar psi Max. hydrostatic pressure 2000 bar psi Max. pump rate lpm 1500 GPM Max. sand content 1 % 1% Max. DLS operational 14 deg/30m 14 deg/100ft Max. temp. operational 200C 390 F Connection top API 6 5/8 REG box API 6 5/8 REG box Make up torque Nm ftlbs Connection bottom API 6 5/8 REG pin API 6 5/8 REG pin Make up torque Nm ftlbs Configurations: XD = Standard XB = Pressure balanced

20 6 ¾ X-series AST TOOL SPECIFICATIONS: PARAMETER METRIC Imperial Length 3.96m 13,0 Stroke 0.20m 0.6 Max. OD 171mm 6.75 Min. ID 62mm 2.4 Mass 625 kg 1375 lbs Max. WOB operational 30 kdan 66 klbs Max. downhole torque 41 knm 30 kftlbs Max. RPM As recommended from bit manufacturer As recommended from bit manufacturer Ultimate tensile load 327 kdan 720 klbs Operational tensile load 170 kdan 375 klbs Max. internal pressure 690 bar psi Max. hydrostatic pressure 2000 bar psi Max. pump rate 3500 lpm 925 GPM Max. sand content 1 % 1% Max. DLS operational 20 deg/30m 20 deg/100ft Max. temp. operational 200C (XT 220C) 390 F (XT 425F) Connection top NC 50 box NC 50 box Make up torque Nm ftlbs Connection bottom NC 50 pin NC 50 pin Make up torque Nm ftlbs Configurations: XD = Standard XB = Pressure balanced XT = High temp. (220C)

21 4 ¾ X-series AST TOOL SPECIFICATIONS: PARAMETER METRIC IMPERIAL Length 3.68m Stroke 0.25m 10 Max. OD 121mm 4.75 Min. ID 35mm 1.38 Mass 300 kg 660 lbs Max. WOB operational 15 kdan 33 klbs Max. downhole torque 13 knm 9 kftlbs Max. RPM As recommended from bit manufacturer As recommended from bit manufacturer Ultimate tensile load 180 kdan 400 klbs Operational tensile load 55 kdan 121 klbs Max. internal pressure 690 bar psi Max. hydrostatic pressure 2000 bar psi Max. pump rate 1500 lpm 400 GPM Max. sand content 1 % 1% Max. DLS operational 25 deg/30m 25 deg/100ft Max. temp. operational 200C (XT 220C) 390 F (XT 425F) Connection top NC 38 box NC 38 box Make up torque Nm ftlbs Connection bottom NC 38 pin NC 38 pin Make up torque Nm ftlbs Configurations: XD = Standard XT = High temp. (220C)

22 TT-series AST TOOL SPECIFICATIONS: PARAMETER / TOOL SIZE O.D. Inches 1-11/16 2-1/8 2-7/8 3-1/2 I.D. Inches (mm) 0.62 (16) 0.67 (17) 0.78 (20) 0.98 (25) Length ft (m) 4.9 (1.49) 4.6 (1.40) 4.3 (1.31) 4.4 (1.34) Weight lbs (kg) 27 (12) 42 (19) 62 (28) 106 (48) Tool Joint 1 AMMT 1-1/2 AMMT 2-3/8 PAC 2-7/8 REG Max Opr Torque ft-lbs (Nm) 200 (275) 400 (550) 1000 (1370) 1315 (1800) Ultimate Tensile lbs (kn) (223) (247) (563) (945) Max Dog Leg Deg/100 ft (30m) Max Temp F (C) 390 (200) 390 (200) 390 (200) 390 (200) Sour Service Yes Yes Yes Yes Air/Foam Yes Yes Yes Yes

MONITORING TOOL STATUS ON SITE Typically, the AST tool will produce smooth operating parameters and good drilling progress seen from surface.

23 MONITORING TOOL STATUS ON SITE Typically, the AST tool will produce smooth operating parameters and good drilling progress seen from surface. Under certain conditions the tool may work hard downhole to mitigate drilling vibrations. In the event that the BHA is tripped, a surface check of the helical spline system should always be performed before re-running the tool. Measure backlash Rotate Wear limits are provided for the different tool sizes and make it easy to monitor the condition of the tool. The general service interval is 200 drilling hours.

25 NEW TECHNOLOGY FOR A NEW ERA The continuous search for hydrocarbons is moving the drilling industry into new, unknown environments. With this expansion, the uncertainty inherent in sub-surface formations implies increasing economic risk. The AST is an effective way to reduce this increased risk while increasing the overall rate of penetration.

P.O. Box 332, Forus NO-4067 STAVANGER NORWAY Call: +47

Street, Aberdeen, AB10 1RJ, UK Call: +44 (0) 1224

no USA Anti Stick-Slip Technology LLC 4103 Chance Lane,

tomax-usa@tomax.no BRAZIL Tomax do Brasil Av.

26 RENDER.NO LOCATIONS NORWAY Tomax AS Travbaneveien 1, Forus P.O. Box 332, Forus NO-4067 STAVANGER NORWAY Call: UK Tomax UK Ltd. 2nd Floor East Wing, Migvie House, 23 North Silver Street, Aberdeen, AB10 1RJ, UK Call: +44 (0) USA Anti Stick-Slip Technology LLC 4103 Chance Lane, Rosharon, TX USA Call: BRAZIL Tomax do Brasil Av. Das Américas 3500/328 bloco Toronto 4, Cep: Barra da Tijuca, Rio de Janerio RJ, BRASIL Call: (21) Also represented in Perth, Auckland, Baku and Dammam. TOMAX.NO

USER MANUAL Doc.No: WI4200 Rev.No: h on-cal support:

USER MANUAL Doc.No: WI4200 Rev.No: 6.00 24h on-call support: +47 51951170 AST FUNCTION The Anti Stick-slip Tool (AST) stabilizes drilling torque originating from the bit through a direct mechanical process