QSST AS Phone: + 47 91 69 29 36

POSTBOX 5047 Phone: + 47 93 04 90 12

N 4084 STAVANGER mail: POST@QSST.NO
web: WWW.QSST.NO

PBL SPLIT FLOW BYPASS SYSTEM

QSST is pleased to introduce a new option for the PBL Multiple Activation Bypass System for drilling, completion and
workover operations. This option is the patent pending Split Flow Dart which will allow a precalculated amount of drill-
ing or completion fluid to pass through the PBL Tool and on to the BHA below and the remaining fluid to be bypassed
out the PBL Tool ports. By splitting the flow, the operator is able to have more control over available hydraulics and hole
cleaning parameters.

The Split Flow Dart incorporates a jet nozzle mounted in a cone shaped dart. The ports of the PBL Tool are also equipped
with jet nozzles. By predetermining the sizes of the dart and port nozzles, a calculated portion of drilling fluid can be
bypassed at the PBL Tool. This dart activates the PBL Tool in a similar manner as the ball utilized in standard PBL op-
erations. The Split Flow Dart contains a shear ring manufactured from the same material as the PBL activation balls
and utilizes the same, proven technology to land, activate and shear through the seat.

At the time split flow is required, the Split Flow Dart is inserted into the drill string at the surface and pumped to the PBL
Tool. Once landing, the PBL Tool will open once a predetermined minimum flow rate is established. After opening, the
flow will be divided between the BHA and the ports to the annulus. It is important to maintain flow above the minimum
rates to keep the PBL Tool completely open. Whenever pumping ceases, the PBL Tool will close and there will be no fluid
communication to the annulus through the PBL Tool ports.

To discontinue the split flow option, one steel deactivation ball is dropped. This ball will land in the top of the dart and
shut off flow to the BHA below. At this time the flow will be exiting through the nozzled ports of the PBL Tool. These ports
have a limited TFA due to the split flow option, and caution needs to taken to not develop excessive differential pressure
and cause the dart to shear through the seat. When deactivation (100% of flow to BHA) is required, a total of three steel
deactivation balls are dropped. (Drop only two additional balls if one was dropped as above to discontinue split flow)
One will land in the top of the dart (as above), while the other two will cut off flow through the ports creating a pressure
increase to the preset shear pressure. This will cause the dart to shear through the seat and the dart and balls will be
caught in the ball catcher cage.

The Split Flow Dart option for the PBL Tool will greatly enhance hole cleaning ability while not pumping excessive fluid
through the MWD/LWD, rotary steerable system, drilling motor or drill bit causing possible washouts and difficulty
steering. This simple and reliable system will save the operator large amount of rig time and thus money.

Please contact your QSST Representative for more information on the Split Flow Dart.
 POSTBOX 5047 +47 91 80 00 79
N 4084 STAVANGER MAIL: POST@QSST.NO
WEB: WWW.QSST.NO
NORWAY QSST AS Phone: + 47 91 69 29 36
POSTBOX 5047 Phone: + 47 93 04 90 12
N 4084 STAVANGER mail: POST@QSST.NO
web: WWW.QSST.NO

PBL MULTIPLEPBL SPLIT FLOWAUTOLOCK

ACTIVATION BYPASS SYSTEM
BYPASS SYSTEM

100% FLOW TO BIT DROP DART DART ON SEAT SPLIT FLOW WHEN PUMPS ON
100% flow to bit drop dart dart on seat SPLIT FLOW WHEN PUMPS ON

PUMPS OFF PORTS CLOSED DISCONTINUE SPLIT FLOW BY PASS FLOW PORTS ONLY
PUMPS OFF PORTS CLOSED DISCONTINUE SPLIT BYPASS FLOW PORTS ONLY
DROP 1 DE ACT BALL
FLOWDROP 1 DEACT BALL

DROP 2 ADDITIONAL DEACT BALLS DE ACT DART SHEARED THROUGH SEAT 100% FLOW TO BIT
DROP 2 ADDITIONAL DEACT BALLS DART SHEARED THROUGH SEATDART AND 100% FLOW TO BIT
BALLS IN PLACE PRESSURE UP DART AND BALLS LAND IN BALL
DEACT BALLS IN PLACE PRESSURE UP BALLS LAND IN BALL CATCHER CAGE
CATCHER CAGE
 POSTBOX 5047 +47 91 80 00 79
N 4084 STAVANGER MAIL: POST@QSST.NO
WEB: WWW.QSST.NO
NORWAY QSST AS Phone: + 47 91 69 29 36
POSTBOX 5047 Phone: + 47 93 04 90 12
N 4084 STAVANGER mail: POST@QSST.NO
web: WWW.QSST.NO

PBL MULTIPLEPBL
ACTIVATION
SPLIT FLOWAUTOLOCK BYPASS SYSTEM
BYPASS SYSTEM

1. DrillingMode
1. Drilling ModeFlow
Flow to
to Bit
Bit 2. 2. SplitFlow
Split Flow Dart
Dart Seated
Seated 3. Open 3.
Position Flow thruFlow
Open Position Dart & Ports
thru Dart & Ports

4. Pumps Off Ports Closed

4. Pumps Off Ports Closed 5. Split5.Flow
Split Flow Discontinued
Discontinued One Ball on Seat 6. Open6.Position
Open Position Flow
Flow thru Ports Only
One Ball on Seat thru Ports OnlyPorts

7. Steel De Activation
7. Steel Ball Droped
DeActivation 8. Dart Sheared
8. Dart thru Seat
Sheared thru& Dart
SeatFalling
& 9.9.Drilling
DrillingMode Flow
Mode to Bit
Flow
Ball Droped Dart
in to Falling in toCage
Ball Catcher Ball to BitOnlyPorts
Catcher Cageon Seat