The Multi-Activation Jetting Tool is totally balanced and is unaffected by hydrostatic pressure. In addition, the ball shearing pressure can be set to operatoršs preference. The numerous applications for the Multi-Activation Jetting Tool include:

• Jetting BOP, wellhead walls and risers to remove buildup of drill cuttings arid mud cake.
• Increasing flow rates to aid in hole cleaning during displacements, work-overs and drilling.
• Use in conjunction with various brush Tools for maximum riser cleanup during the displacement
• Additional drilling clean out and/or brush tools can be run in the work-string below the Riser Bristle Brush Tool and Multi-Activation Jetting Tool since the jetting tool can be selectively opened and closed.
• One-trip displacements with multi-activation feature
• Can be used for drilling applications for cleanout of BOP, risers and liner tops without additional trips
• The Jetting Tool can be tested at any time on surface or in the hole.

OPERATIONAL INFORMATION

A) MAKE UP PROCEDURE:

The diffuser housing sub; is made up on top of the ball catcher sub. Makeup torque is per connections on tool used. Do not over torque.

Ball Catcher sub: Ensure ball catcher cage is in sub, with bevelled end facing up and no-go on bottom. It is imperative that when you drop a vinyl ball to activate the tool, that you follow it with a steel ball to de-activate the tool, it is important that this sequence is carried out at all times to ensure that the tool operates correctly.

Before activating the tool check and make note of pump pressure/strokes. These notes will be referred to upon de-activation of tool to confirm tool is reset.

Break drill string at floor and drop vinyl ball. Depending on fluid being used to pump ball down, it will affect the time and the fluid volume pumped to get the vinyl ball to the seat and open the bypass on the circulating sub.

Extreme care should be taken when pumping the vinyl ball down. Do not pump at high fluid rates or pressures as this will cause vinyl ball to prematurely blow through seat and will result in procedure having to be repeated. If this happens, drop steel de-activation ball to ensure vinyl ball has blown through seat before dropping another vinyl ball.

Note: If drill string is plugged, an Emergency Ball Dart Combination can be used to activate the tool. This must be dropped dart end first. This Ball Dart Combination can be used if flow rates are greatly restricted or the drill string is plugged. The dart will assist in getting the activation ball to the tool without flow.

It is recommended to keep pump rate at 5 bpm or less and/or pressure below 2000 psi when ever possible. The vinyl ball will usually seat sooner than calculated pump strokes due to gravity and fluid characteristics, so care should be taken when actually pumping the vinyl ball down onto the seat.

When ball hits the seat the inner mandrel will drop to its open position and mud/fluid will divert through the jetting nozzles. Surface indication of tool open is a pressure drop. Once toot is open, increase pumps to desired rates but keep pump pressure below set ball shearing pressure. (Ball shearing pressure can be pre-set to operatoršs preference).

We recommend that a constant pump rate be maintained whilst the tool is opened.

C) DE-ACTIVATION PROCEDURE:

Break string at rig floor and drop appropriate steel ball. After dropping the small de-activation steel ball, pump normally. When steel ball reaches the tool, the steel ball will cut off flow through the jetting housing creating a pressure increase. It is preferred when the steel ball lands in the tool to increase pump rate to achieve the preset ball shearing pressure, as quickly as possible this will reduce the washing effect of the mud/fluid on the ball and the port of the jetting housing.

The vinyl ball will blow through the seat at the pre-set ball shearing pressure and land in the ball catcher sub.

The piston will then move up, closing the jetting housing port and the steel ball will drop into the ball catcher sub. Circulation will then be through to bottom hole assembly. The 6 1/2˛ OD jetting tool can be opened and closed 4 times, and the 11˛ and 16˛ OD jetting tools, 6 times.