Multiple Opening Circulation Sub, the unique solution to cure losses by pumping LCM in the annulus bypassing drilll stri...
Multiple Opening Circulation Sub (MOCS Tool)
MOCS Tool 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
• Horizontal drilling - Boosting annular velocities - Low side cuttings cleanout
• Work-over and completions - Well bore cleanout - Fluid displacements - Bottoms-up circulation
• Borehole enlargement - Cutting acceleration while reaming
Features
Benefits
• 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
• 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
• Sub sea riser/BOP jetting
Technical Specifications 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 Position (in )
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 Tool (water) (psi)
50@ 300gpm
50@ 600gpm
40@ 1000gpm
Standard Tool Joint (in)
API 32 IF
API 42 IF
API 6s Regular
4
2
10
*
*TFA and Drop Ball sizes can be changed upon request 1 Anything in this brochure may change without notice, 2When drilling fluid density equals 8.3 lb/gal, 3With no drop ball in the tool, 4Flowing into the annulus instead of into the BHA below the tool, 5Flowing through the drill bit, 6A high-temperature seal set is available to increase this rating to 450°F, 7A 1.44” diameter drop ball is available, 8A 2.25” diameter drop ball is available, 9 A 2.38” diameter drop ball is available, 10When drilling fluid density equals 8.3 lb/gal
Tool Operating Modes RESET MODE NO DROP BALL
BYPASS MODE
RESET MODE PUMPS OFF
NON-BYPASS MODE
Run in hole position with open through bore.
Pump pressure forces the piston valve down, opening the ports to the annulus and closing off flow through sensitive BHA components.
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.
CLICK TO PLAY VIDEO !!!!!!
Performance Summary
MOCS Tool (Multiple Opening Circulating Sub)
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. 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) SPP Bypass Position (psi) SPP Non-Bypass Position (psi) SPP Difference between Bypass and Non-Bypass (psi)
530 220 458 238
Results: 100% tool functionality downhole. 18 complete tool cycles in one run with one drop ball. The tool was easily operated.
MOCS TOOL APPLICATIONS • 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
FEATURES BENEFITS • Easy to train on and easy to use • Simple operation that requires only one ball • Flow rate actuated • Alleviates dependency on multiple drop balls • Unlimited cycling between Bypass /Non-Bypass • No wasted trips for an exhausted tool • 60 second cycle time with ball on seat • Reduced non-productive time • Tool position clearly indicated by SPP • No guessing about tool position • Tool is designed to trip dry pipe • No need to lock tool open to trip dry pipe • Indexing mechanism and spring are oil sealed • Dependable performance • Variable drop ball size • Flexible compatibility with various string IDs
www.nov.com/downhole ©2014 National Oilwell Varco. All rights reserved.
[email protected]
MOCS Tool (Multiple Opening Circulating Sub)
Performance Statement
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. 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.
Activation Summary: SPP Before Activation (psi) 1100 SPP Bypass Position (psi) 530 SPP Non-Bypass Position (psi) 1200 SPP Difference between Bypass and Non-Bypass Position (psi) 670 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.
MOCS TOOL APPLICATIONS • Horizontal Drilling • Boosting annular velocities • Low side cuttings cleanout • Borehole enlargement applications • Subsea riser/BOP jetting
• Pumping LCM • Spotting Acid • Workover and Completions • Wellbore cleanout • Fluid displacements • Bottoms -up circulation
BENEFITS FEATURES • Easy to train on and easy to use • Simple operation that requires only one ball • Alleviates dependency on multiple drop balls • Flow rate actuated • Unlimited cycling between Bypass /Non-Bypass • No wasted trips for an exhausted tool • Reduced non-productive time • 60 second cycle time with ball on seat • No guessing about tool position • Tool position clearly indicated by SPP • No need to lock tool open • Tool is designed to trip dry pipe • Dependable performance • Indexing mechanism and spring are oil sealed • Flexible compatibility with various string IDs • Variable drop ball size
www.nov.com/downhole ©2014 National Oilwell Varco. All rights reserved.
[email protected]
Performance Statement
MOCS Tool (Multiple Opening Circulating Sub) 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.
Run Statistics 4 3/4" MOCS Mud Type Water Mud Flow 260 gpm
Activation Flow
SPP before activation 500 psi
SPP difference Bypass, Non-Bypass 600 psi
MW
SPP Bypass
MOCS Valve Shifts:
9.2 ppg
166 gpm 100 psi
SPP Non-Bypass
700 psi 4 (2 cycles)
FEATURES BENEFITS • Easy to train on and easy to use • Simple operation that requires only one ball • Flow rate actuated • Alleviates dependency on multiple drop balls • Unlimited cycling between Bypass /Non-Bypass • No wasted trips for an exhausted tool • 60 second cycle time with ball on seat • Reduced non-productive time • Tool position clearly indicated by SPP • No guessing about tool position • Tool is designed to trip dry pipe • No need to lock tool open to trip dry pipe • Indexing mechanism and spring are oil sealed • Dependable performance • Variable drop ball size • Flexible compatibility with various string IDs
www.nov.com/downhole ©2014 National Oilwell Varco. All rights reserved.
[email protected]
