AVS in Thru-bore position. This is the standard position where all the drilling fluid is pumped through the AVS, BHA and drillbit.
AVS
The AVS is a DEAP activated Multi-position, Multi-cycle Flow Divertor. It can be run anywhere in the drillstring or BHA, even below an MWD as there are no balls or darts to drop to activate. It has 3 positions; Thru-bore, Splitflow for Hole Cleaning While Drilling and Full Bypass for LCM dump or rapid well
AVS has 3 positions
AVS in Splitflow position. A portion of dilling fluid bypasses the BHA, reducing pressure losses, allowing a flow increase, maximising AV.
AVS in Bypass position. 4in² TFA are opened for rapid wellbore clean up or dumping of LCM. A ball valve closes to protect BHA components.
What is splitflow?
Hole cleaning effectiveness is a function of; Hole angle, Mud rheology, Hole size, Drillpipe size, drillstring RPM, Mud density, Mud annular velocity, Annular eccentricity, Cutting size and ROP. Practical experimentation has shown that the most effective hole cleaning parameters are Mud Annular Velocity and Mud Density. The higher the AV, the more cuttings are removed from the wellbore.
The AVS and AVD can be Nozzled to allow a certain amount of the flow to be diverted into the Annulus, bypassing the BHA. This can be engineered using IDT’s Splitflow software to allow the minimum flow requirement to power MWD / RSS Motor / Bit hydraulics etc, and the remainder out to the annulus. This maximizes Annular Velocity for a given surface pressure.
The 1st chart shows how a Splitflow of 35/65, keeps enough flow going through the BHA (800-600gpm) to power BHA and bit components but the overall flowrate is 20% higher than if all the flow was going through the BHA. The 2nd chart shows the increase in cumulative volume pumped over the example hole section. This is over 37,000bbls additional fluid pumped which means 20% more cuttings removed from the wellbore.
Features
No drop balls, Darts or RFID tags
Command via surface Downlink
Simple and Rapid commands
Throughbore at all times
Battery powered. Low power draw
In excess of 100 cycles
Splitflow position with Variable
Bypass position with BHA shutoff
4in² TFA in full Bypass position
Benefits
Can be run in any inclination well
Can be activated in horizontal wells
Can be run anywhere in the BHA
Can be run below an MWD
Splitflow maximises Annular Velocity
Up to 200ppb LCM through Bypass
LCM will not enter BHA in Bypass
Cleans hole while drilling in Splitflow
No waiting for Balls and Darts to drop
Applications
The AVS has multiple application including:
Maximise hole cleaning while drilling
Pumping LCM
Stabilisers preventing pack offs
Run behind Reamer
Subsea Riser / BOP Jetting
Hole cleaning with Tapered String
Adopt DEAP technology with the AVS Flow Divertor for smarter, more efficient and cost-effective drilling operations. These tools accelerate activation times, drastically reducing rig time and rig cost, and enhancing drilling performance, positioning your operations for greater success.