PBL Operating Instructions

8/12/2019 PBL Operating Instructions

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100 Burgess Drive * P.O. Box 418 * Broussard, LA 70518Ph.: 337-839-2413 * Fax: 337-839-2414 060107DHD

2 ½” SPLIT FLOW DART

Operating Instructions

The Split Flow Dart will allow pre calculated percentage of the drilling fluid to pass through the PBL

(depending upon the system hydraulics) and on to BHA below the PBL while the remainder of thedrilling fluid will flow out the nozzled ports of the PBL. The split flow dart should only be utilized when

circulating drilling fluid is required and is not recommended for heavy LCM applications.

Activation Procedure

1. Prior to activating the tool, record Pump pressure ________ Pump Strokes ______ .

This will be used as a reference to confirm de-activation of the tool.

2. Break drillstring at floor and drop one (1) 2.5” Split Flow Dart. It must be dropped

rounded nose down (i.e. white shear ring and cap upwards). See Diagram.

3. It is recommended to maintain slow pump rates, as the weight of the dart will cause the

dart to seat quickly without being pumped down.

4. When the activation dart lands on-seat, the inner mandrel will shift to its open positionagainst the spring. NOTE: IT TAKES 200-250 PSI DIFFERENTIAL PRESSURE

ACROSS DART NOZZLE TO FULLY ACTIVATE /OPEN THE TOOL. Fluid will

now be diverted through the side ports and also through the dart to the BHA. As long as

pumping is continuous, fluid will be diverted through the ports. If pumping is halted, thesliding sleeve will shift to the closed position. When pumping resumes, the mandrel will

shift open again allowing fluid diversion through the ports of the Bypass Tool. Be certainto maintain a continuous and maximum rate of flow while the dart is on seat.

- Surface indication of the tool being in the open position is a pressure change. Compare pump

pressure/strokes to rates and pressures recorded in step one. Once the tool is open, pumprates can be increased to the desired rate above the tool deactivation shearing pressure. High

pump rates/PSI will not push the dart through the seat and deactivate the tool. The deactivation

pressure, marked on the tool, only applies after the steel balls have been dropped to deactivatethe tool.

- Rotating and reciprocating the drillstring is good practice while activating the PBLMultiactivated Bypass Circulating Sub.

-

- It is not recommended to utilize the split flow dart in well bores with angles greater than

55º.




Discontinuing Split Flow Option

1. Break the drill string at rig floor and drop 1 steel 1.75” de-activation ball.

2. After dropping the de-activation ball, displace 50% of the volume while pumping at 50%

of the normal flow rates and watch for a pressure increase. When the steel ball lands on

the dart, it will cut off flow through the dart and create a pressure increase. At this time,all drilling fluid will pass out the nozzled ports of the PBL. Do not allow the differential

pressure being pumped through the port nozzles to become larger than the shear pressure

of the dart or the PBL will deactivate.

De-Activation Procedure

1. Break the drillstring at rig floor and drop 2 steel 1.75” de-activation balls. If

discontinuing split flow option was not performed, then drop 3 steel 1.75” de-activation balls at this time. It is recommended to wait 15 seconds between dropping each ball.

2. After dropping the de-activation balls, displace 50% of the volume while pumping at

50% of the normal flow rates and watch for a pressure increase. When the steel balls

reach the Bypass Tool, they will cut off flow through the ports and creating a pressureincrease. Bring the pressure up as quickly as possible. A pressure decrease is an

indication the dart has blown through the seat and into the ball catcher. The steel balls

will follow into the ball catcher. The dart will blow through the seat at +/- 10% of

stated shear pressure depending upon down hole conditions.

3. After the dart shears through the seat, the sleeve will move to the closed position.Circulation will now be through the BHA.

4. When pumping is resumed, check that the pressure and strokes are the same as they were

prior to activating the PBL Tool (See data recorded in step one, above).

- NOTE: - After tripping out of the hole, the darts and balls must be removed from the ballcatcher sub before RIH again. The used vinyl shear ring should NEVER BE RE-RUN. If the

PBL sub is to be rerun after being activated, it is strongly recommended to deactivate the

tool prior to tripping out of the hole to minimize the wear within the tool caused by

tripping with the tool activated. Each time a dart is utilized; one less PBL cycle is availablefor activation.




Emergency Hollow Dart

A Hollow Dart equipped with a 2.5” shear ring is supplied as part of the package of operating balls. The Hollow Dart is to be utilized only in cases where it is not possible to pump down

the Vinyl Ball. These darts are weighted approximately 6-7 times greater than the standard

vinyl balls to facilitate activation of the PBL sub when limited or no circulation is possible.

These darts MUST be dropped nose down (i.e. white shear ring and pointed cap upwards)into the drillstring when activating the tool. The Hollow Dart does not have the split flow

option and is deactivated by dropping two 1 ¾” steel balls.

Should there be any questions regarding the operational procedures of the PBL tool or the Split

Flow Dart please contact your Downhole Devices Representative.

Split Flow Dart

Drop This End Down

Split Flow Dart w/ One 1.75” De-

Activation Ball to Stop Flow Through

Dart

Drop This End Down




DRILLING MODE

100% FLOW TO BIT

PUMPS OFF – PORTS CLOSED

DROP 2 ADDITIONAL DEACT

BALLS

DE-ACT BALLS IN PLACE

PRESSURE UP

DROP DART

DART ON SEAT

DISCONTINUE SPLIT FLOWDROP 1 DE-ACT BALL

DART SHEARED THROUGH SEAT

DART AND BALLS LAND IN BALL

CATCHER CAGE

SPLIT FLOW WHEN PUMPS ON

BY-PASS FLOW - PORTS ONLY

DRILLING MODE

100% FLOW TO BIT

READY FOR NEXT ACTIVATION

PBL Operating Instructions

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