API Multi-Activation Circulation Sub

BEIJING - Oct. 13, 2025 - PRLog -- DESCRIPTION：
The Circulation Sub is an innovative multi-cycle opening-closing bypass circulation sub. It is used for dealing with a variety of potential problems, such as loss of circulation, poor hole cleaning, risk of sidetracking, plugged bit nozzles, cutting beds, etc.

APPLICATIONS：
1-Pump LCM for drilling operation
2-Hole cleaning in ERD and horizontal wells
3-Jet Riser & BOP stack for deep water wells
4-Circulation for completion & intervention
5-Acidizing & Stimulation
6-Clean cuttings bed in deviated wells

ADVANTAGES：
1-Multi-cycle operations
2-Robust design
3-Rupture disk design optional
4-Weighted ball design

OPERATION PROCEDURES：
1-One ball as an opening ball is dropped and landed on the ball seat, a piston is pushed down, and the tool is switched to an opening position
2-Drop closing balls, a piston is pushed down; the balls are forced through the inner tube and the tool is switched to a closing position
3-The process can be repeated and the cycle can be 5-10 times depending on the practical need

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