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COILED TUBING
Product Sales Bulletin
TM
Tornado Nozzle
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BJ Services specifically developed its Tornado coiled tubing nozzle as part of an improved process for well cleanout operations. Used in conjunction with BJ’s exclusive Tornado Pro job design software, this novel process provides a highly effective means for removing sand and similar fill material from deviated or horizontal wellbores.
BJ’s Tornado Tornado coiled tubing nozzle is sp ecifically designed for deviated and h orizontal well cleanouts.
Current approaches to the problem •
Large diameter coil
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Higher flow rates
Many of the practical choices for polymer-based cleanout fluids exhibit shear thinning. As a result, particles cannot stay suspende d indefinitely and settle to form an equilibrium bed on th e low side of the hole, especially in the highly eccentric annular flow encountered in deviated coiled tubing cleanouts. Unfortunately, because fluids with good particle suspension properties ha ve poor particle re-entrainment characteristics once an equilibrium bed has formed, most polymer systems tend to “slide” over the settled sand bed, leaving large vo lumes of sand or fill in the wellbore. The current approaches to remove these beds involve seeking out even more exotic/costly fluids or using higher flow rates (which dictate larger diameter coiled tubing). Neither of these approaches ensures complete fill removal in every case.
BJ’s solution •
Avoids larger diameter coiled tubing
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Uses smaller volumes of fluid
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Allows easy-to-follow field procedures
Rather than focusing on finding a cleano ut fluid with perfect particle suspension capability (or, even more challenging, finding a fluid with adequate suspension properties and near-perfect re-entrainment capability), BJ researchers investigated physical investigated physical methods methods for re-entraining particles that have settled into beds. The result of their efforts is a jetting nozzle with switchable switchable forward and backward facing jets. By selecting the backward facing jets and co ntrolling pull-out-of-hole speed (at rates determined by BJ’s associated particle transport software), the settled sand bed can be “swept” out of the hole with near 100% efficiency. efficiency.
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Product Sales Bulletin
COILED TUBING TM
Tornado Nozzle
S T C U D O R P
AND
S E R V I C E S
How the Tornado coiled tubing nozzle works The Tornado nozzle diverts the flow of jetting fluid in either direction. BJ coiled tubing operators use the forward facing jets to break-up and fluidize compacted fill while running in and then cycle to the backward facing jets to efficiently “sweep” fill from the low side of the well while pulling out of hole. Engineering algorithms embedded in BJ’s software calculate h ow fast the coil can be run into the fill and how quickly the coil can be “swept” back up the well. Running in too fast deposits large sand beds behind the nozzle that are difficult to remove completely. Pulling up too fast bypasses sand beds and leaves fill behind. With BJ software-based job planning, effective fill removal is assured.
The Tornado nozzle and precise job proce dures determined by BJ software calculations can effectively remove sand beds from the low side of the well.
Benefits of Tornado technology •
Greatly reduces time required for more challenging well cleanouts
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Removes virtually 100% of the fill material
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Boosts production while increasing the intervals between cleanouts
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Protects against stuck coil by avoiding sand compacting behind th e jetting nozzles
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The above features and/or data are supplied solely for informational purposes and BJ Services Company makes no guarantees or warranties, either expressed or implied, with respect to their accuracy or use. All product warranties and guarantees shall be governed by the BJ Services Company standard at the time of sale or delivery of service. Actual product performance or availability depends on the timing and location of the job, the type of job and the particular characteristics of each job. This document is controlled by the reference date. To ensure that this is the current version, please reference the Services section of the BJ Services Website (www.bjservices.com) or ask your BJ representative.
