MOCS Catalogue

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Technical Specifications

*TFA and Drop Ball sizes can be changed upon request

Tool O.D. (in) 4w 62 8

Tool I.D. (in) 14 1d 2a

Tool Length (ft) 8.8 8.3 9.4

Weight (lbs) 380 750 1240

Tensile Yield (ft-lbs) 500,000 1,250,000 1,800,000

Torsional Yield (ft-lbs) 30,000 50,000 110,000

Maximum Allowable Flow Rate (GPM) 350 700 1,200

Minimum Activation Flow Rate2_(GPM) ₂₀₀ ₄₀₀ ₅₅₀

Maximum Recommended Operating Torque (ft-lbs) 18,000 30,000 60,000

TFA Before Activation3_(in2₎ _1.23 _2.76 _4.43

TFA in Bypass Position4_(in2₎ _0.88 _1.42* _3.00

TFA in Non-Bypass Position5_(in2₎ _0.67 _1.35 _1.90

Maximum Allowable Temperature6_(°F) ₃₀₀ ₃₀₀ ₃₀₀

Maximum Differential Pressure (psi) 5,000 5,000 5,000

Maximum Hydrostatic Pressure (psi) 30,000 30,000 30,000

Standard Drop Ball Diameter (in) 1.637 _2.258 _2.509

Pre-Activation Pressure Drop Across Tool10_{(water) (psi)} _{50@ 300gpm} _{50@ 600gpm} _{40@ 1000gpm}

Standard Tool Joint (in) API 32 IF API 42 IF API 6s Regular

The NOV Downhole Multiple Opening Circulation Sub (MOCS Tool) is a new circulation sub that allows unlimited cycling between porting to the annulus (at the tool) and flowing to the bit. This new Drop Ball activated circulation sub has been proven to add value in a variety of applications over a wide range of conditions.

MOCS Tool Applications

•BHA Protection - Pumping LCM

- Spotting Acid

•Work-over and completions - Well bore cleanout

- Fluid displacements - Bottoms-up circulation

Features

• Simple operation that requires only one ball

• Flow rate actuated

• Unlimited cycling between bypass/non-bypass

• 60 Second cycle time with ball on seat

• Tool position clearly indicated by SPP

• Tool is designed to trip dry pipe

• Indexing mechanism and spring are oil sealed

• Variable drop ball size

MOCS Tool

•Horizontal drilling

- Boosting annular velocities

- Low side cuttings cleanout

• Borehole enlargement

- Cutting acceleration while reaming

• Sub sea riser/BOP jetting

Benefits

• Easy to train on and easy to use

• Alleviates dependency on multiple drop balls

• No wasted trips for an exhausted tool

• Reduced non-productive time

• No guessing about tool position

• No need to lock tool open

• Dependable performance

• Flexible compatibility with various string IDs

1_{Anything in this brochure may change without notice,}2_{When drilling fluid density equals 8.3 lb/gal,}3_{With no drop ball in the tool,}4_{Flowing into the annulus instead of into the BHA below the}

tool, 5_{Flowing through the drill bit,}6_{A high-temperature seal set is available to increase this rating to 450°F,}7_{A 1.44” diameter drop ball is available,}8_{A 2.25” diameter drop ball is available,} 9_{A 2.38” diameter drop ball is available,}10_{When drilling fluid density equals 8.3 lb/gal}

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BYPASS

MODE

Tool Operating Modes

NON-BYPASS

MODE

RESET MODE

PUMPS OFF

With pumps off, the tool returns to reset position. Even with the ball on seat, the MOCS is designed to allow the drill stem to drain

while tripping pipe.

Once in non-bypass mode with the ball on the seat, the tool routes

flow back to the bit to continue circulation through the entire BHA. Pump pressure forces

the piston valve down, opening the ports to the

annulus and closing off flow through sensitive

BHA components.

RESET MODE

NO DROP BALL

Run in hole position with open through bore.

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Performance Summary

•Pumping LCM

•Spotting Acid

•Workover and Completions

•Wellbore cleanout

•Fluid displacements

•Bottoms -up circulation

•Horizontal Drilling

•Boosting annular velocities

•Low side cuttings cleanout

•Borehole enlargement applications

•Subsea riser/BOP jetting

MOCS Tool (Multiple Opening Circulating Sub)

MOCS TOOL APPLICATIONS

FEATURES

• Simple operation that requires only one ball

• Flow rate actuated

• Unlimited cycling between Bypass /Non-Bypass

• 60 second cycle time with ball on seat

• Tool position clearly indicated by SPP

• Tool is designed to trip dry pipe

• Indexing mechanism and spring are oil sealed

• Variable drop ball size

BENEFITS

• Easy to train on and easy to use

• Alleviates dependency on multiple drop balls

• No wasted trips for an exhausted tool

• Reduced non-productive time

• No guessing about tool position

• No need to lock tool open to trip dry pipe

• Dependable performance

• Flexible compatibility with various string IDs

www.nov.com/downhole [email protected]

First 6 1/2” MOCS run in India delivers consistent

performance, cycling 18 times to Bypass mode and helping

cure mud losses in a single run.

India, Q2 2014.

Results:

 100% tool functionality downhole.

 18 complete tool cycles in one run with one drop ball.  The tool was easily operated.

Objective:

To activate the tool and pump several LCM pills in order to cure lost circulation.

Summary:

The MOCS tool was run as part of a 8 ½” directional hole section with viscous water as the drilling fluid. Heavy losses were observed at 52 meters, but the tool was first activated at 110 meters when it came out from the conductor casing and reached the lost circulation zone. While drilling through the fault zone, 90 lb/bbl LCM pills (Quick Seal & CaCo3 flakes) were circulated. The losses were controlled, but the MOCS remained in the BHA with the dropped ball inside to tackle any further losses. Overall, the MOCS was cycled to Bypass mode 18 times (36 valve shifts) until TD was reached. The first activation summary is exhibited in the table below.

Activation Summary:

SPP Before Activation (psi) 530

SPP Bypass Position (psi) 220

SPP Non-Bypass Position (psi) 458

SPP Difference between Bypass and Non-Bypass (psi) 238

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Performance Statement

•Pumping LCM

•Spotting Acid

•Workover and Completions

•Wellbore cleanout

•Fluid displacements

•Bottoms -up circulation

•Horizontal Drilling

•Boosting annular velocities

•Low side cuttings cleanout

•Borehole enlargement applications

•Subsea riser/BOP jetting

MOCS Tool (Multiple Opening Circulating Sub)

MOCS TOOL APPLICATIONS

FEATURES

BENEFITS

• No need to lock tool open

The first 8” MOCS run in India delivers an outstanding

performance by cycling 20 times and curing all mud

losses in a single run.

India, Cairn, Q1 2014.

Results:

 100% tool functionality downhole.

 20 tool cycles in one run with single drop ball.

 Eliminated multiple unnecessary trips that were previously unavoidable.  Saved at least 7 drilling hours.

Objective:

To activate the tool and pump down several LCM pills in order to cure lost circulation.

Summary:

The MOCS was run in a 12 ¼” hole section with 24.9° inclination and 4.17°/30m DLS. The tool was first activated at a 108m depth when complete losses were observed. A 60 lb/bbl LCM pill (Quick Seal & CaCo3 flakes) was pumped in the initial phase. The concentration was increased to 90 lb/bbl for additional pills until the 285m section TD was reached. The losses were successfully controlled and a total of 20 LCM pills were pumped through the tool. Overall, utilizing the MOCS tool provided cost-effective drilling to the operator.

SPP Non-Bypass Position (psi) 1200 SPP Difference between Bypass and Non-Bypass Position (psi) 670 SPP Before Activation (psi) 1100

Activation Summary:

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Performance Statement

MOCS Tool (Multiple Opening Circulating Sub)

FEATURES

BENEFITS

• No need to lock tool open to trip dry pipe

First 4 ¾” MOCS tool run in Colombia delivers 100%

operational success in drilling operations.

Chacharo 1 well, Llanos, Colombia, Petrobras, Q1 2014.

Objective:

Bypass flow to the wellbore annulus as a contingency for possible lost circulation in the 7” section.

Summary:

4¾” MOCS: The tool was run on a motor steerable BHA to drill the 7” hole for possible lost

circulation in the Guadalupe and Mirador formations. At surface point, the MOCS tool was activated into bypass mode to eject flow to the annulus.

Even though no lost circulation material was needed during the drilling operations, the tool successfully completed 2 cycles and was cycled into Non-Bypass mode to continue with drilling operations. Lithologies include sand, shale and sandstone.

Results:

 100% tool functionality downhole.

 Up to 3 complete tool cycles in one run with a single drop ball.  The tools were easily operated.

Mud Type Water Activation Flow 166 gpm SPP Non-Bypass 700 psi

Mud Flow 260 gpm SPP before activation 500 psi SPP difference Bypass, Non-Bypass 600 psi

MW 9.2 ppg SPP Bypass 100 psi MOCS Valve Shifts: 4 (2 cycles)