DescriptionThe multiple opening circulation sub (MOCS tool) from NOV can improve drilling efficiency, reduce drilling costs, and enhance the safety of your operation. The MOCS tool is activated and infinitely cycled with a single ball that changes the drilling fluid flow path from the ID of the string (non-bypass) to the annulus (bypass), providing unlimited and reliable on-demand cycling in as little as 10 seconds.
With the MOCS tool in your drillstring, you quickly and effectively tackle multiple mud/fluid-loss situations and hole cleaning applications in the same interval. And because the tool does not require any dedicated trips to empty an internal ball catcher, it can reduce NPT and improve the efficiency of your operation.
Features/Benefits
Easy to use – simple operation requires only one ball
On-demand performance – cycles in as little as 10 seconds with ball on seat
Unlimited cycling – flow rate actuation alleviates need for multiple balls
Versatile – can be loaded on surface and placed anywhere in the string
Safe – eliminates the need to break string at every cycle
ID compatibility – variable ball size allows for flexibility with various string IDs
Reduced invisible-lost time – no wasted trips for an exhausted ball catcher
Designed to trip dry pipe – ports shift closed when pumps are off, automatically draining to lower BHA
Allows fishing operations below the tool – open through bore before activation or by fishing ball
Maintains well control safety – automatically closes ports when pump flow is significantly reduced
Applications
BHA Protection
• Pumping LCM for lost circulation
• Spotting Acid
Wellbore cleanout
• Work–over/Completion operations
• Subsea Riser/BOP jetting
Hole Cleaning While Drilling
• Increasing annular velocities for improved cuttings/debris removal
Borehole enlargement
• Cutting acceleration while reaming
• Control of under reamer function
Coring
• Enhances hole cleaning
• Provides cutting relief
• Reduced lag time when circulating samples or displacing fluid
Fishing
• Effectively utilized with the Agitator™ system
Unactivated Mode No Drop Ball: Run in hole position with open through bore
By pass Mode After Ball Drop: Pump pressure forces he piston valve down, opening the ports to the annulus and closing off flow through sensitive BHA components.
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.
Non-Bypass Mode: 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
石油圈
