Operations Manual
1. Tool information – Minimum and maximum flow rate, fluid velocity, HSI. 2. Flow Rate Range – The graph of operational range for flow rates. 3. GPM Range – Mud weight changes and the corresponding flow rate changes. 4. Max Pressure/Target Pressure – Max pressure recommended, and the target or calculated pressure drop. It is recommended that target pressure does not exceed 5% of max pressure drop. Flow Restrictors The combination of lower-than-normal flow rates with lighter mud weights make it difficult to generate the required pressure drop from the bit nozzles, in this instance D-Tech can provide flow restrictors which can be inserted into the bit box end of D-Tech Tool. The flow restrictor will lower the pressure drop requirement across the bit which in turn will allow the bit TFA to be increased. The use of flow restrictor is dependent upon the well hydraulics and drilling program. The D-Tech Operations team will determine whether a flow restrictor is required, and which size is appropriate. Below are the steps for inserting the flow restrictor. If it is likely that a flow restrictor is required, it must be requested as early as possible to ensure availability for the run. Note – Currently D-Tech provides flow restrictors for all tool sizes. Careful consideration to downlinking flow rates should be taken when running in lo flow situations. 1. Select appropriate flow restrictor kit, each tool size has a designated flow restrictor sleeve and various sized carbide inserts, see Figure 10 2. Make up the flow restrictor using the required O-rings, ensure the carbide insert is secured using spiral clip. 3. Insert the narrow side of the flow restrictor into the steering body box end. 4. Use the handle of a mallet or hammer to tap the flow restrictor securely into place.
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