Schlumberger

WELL COMMANDER

The WELL COMMANDER tool is normally positioned above the BHA, MWD/ LWD tools, motor or small-diameter drillstring. The tool can be run into or pulled out of the hole with the ports locked open or closed. The ports remain in the same position until the tool is activated by dropping a ball and pressuring up to shift the circulating port.

The operating ball

When required, an operating ball is dropped and pumped down to the WELL COMMANDER tool. When increased pressure unseats the ball, it is expelled into a ball catcher below, leaving the ports in the tool locked opened. To close, another same-sized ball is dropped to the ball seat, pressure increased to activate the inner sleeve and close the ports to resume circulation through the drill bit.

Operating ball size

The tool utilizes the same size operating ball for both opening and closing the ports, removing the worry that the wrong ball will be dropped. A smaller BHA shut-off ball can be dropped to prevent fluid flow or solutions deposition at the top of the BHA. This ball is expelled by the subsequent operating ball.

The ball catcher

The ball catcher, attached to the bottom of the WELL COMMANDER tool, enables 7 complete cycles thanks to its 14-ball capacity. The bypass ball catcher captures the balls to one side of the inside diameter to facilitate positioning other ball-drop tools below the WELL COMMANDER tool.

When the operating ball lands on the seat and pressure is applied, the tool is primed to open. Increased pressure drives the ball through the ball seat and a pressure drop is observed. The operating ball is expelled into the ball catcher, and the tool advances to the locked-open position.

Circulation

With the circulating ports open, the pump rate can then be increased to circulate at higher annular velocities through the open ports. Note that in this open position, there is still a small percentage of fluid circulating around the BHA, keeping it lubricated. In this position, the tool can be used to spot LCM or, for I-BOSS applications, WSM. If these materials have the potential for damaging any of the BHA components, flow to the bit can be isolated by dropping a smaller, differently colored BHA shut-off ball. This smaller-diameter shut-off ball can also be used for stopping flow to the bit.

Closing of the tool

To close the WELL COMMANDER tool and restore all the flow through the BHA again, another operating ball is dropped and pumped down to the tool ball seat. When the ball lands on the seat and pressure is applied, the tool is primed to close via an indexing system. Increased pressure drives the ball through the ball seat and a pressure drop is observed.

Returning to the original, closed position

The operating ball and the BHA shut-off ball are both expelled into the ball catcher and the valve returns to its original, closed position. The pressure is allowed to bleed off before continuing operations.

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Well Commander Valve Saves Brazil Operator USD 1 Million

WELL COMMANDER spotlight tn
The WELL COMMANDER valve saved 24 hours or USD 300,000 of non-drilling time and cost, and more than USD 700,000 in lost mud that would have been consumed making two round trips to address lost circulation problems.
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Bypass Sensitive Downhole BHA Tools

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How the WELL COMMANDER Circulating Tool Works

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