5. Pengujian Rheology Lumpur

Summary

This instructional video outlines the steps for conducting a viscosity test on mud samples using a vanfigimeter. The process involves setting up the rotor and bob components, ensuring correct placement, and adjusting the thermocap. The key steps include adjusting the speed to 600, 200, 100, and 6 RPM, allowing the scale to stabilize before recording values. Additionally, the procedure describes the steps for measuring gel strength at both 10 seconds and 10 minutes by rotating the rotor and recording the highest dial readings. The results are used in calculations for determining mud properties.

Takeaways

• 😀 Ensure the rotor is correctly attached to the lock pin before starting the procedure.
• 😀 Add the mud sample up to the specified level on the thermocap vanfigimeter.
• 😀 Confirm the position of the thermocap foot to ensure proper placement of components.
• 😀 The rotor and Bob components should be submerged in the mud sample up to the correct level.
• 😀 Set the temperature of the thermocap before adjusting the rotation speed.
• 😀 Begin by setting the gear shift knob to 600 RPM and wait for the reading to stabilize.
• 😀 Record the measurement at 600 RPM once it is stable.
• 😀 Adjust the gear shift knob to 200 RPM and ensure the motor is running at high speed.
• 😀 Repeat the process for other speeds: 300, 100, and 6 RPM with the motor on low speed.
• 😀 Use the Bingham plastic equation to calculate values and determine the gel strength at 10 seconds and 10 minutes.
• 😀 For gel strength measurement, rotate the rotor at 600 RPM for 10 seconds, then wait for 10 seconds at 0 RPM, and record the highest reading at 3 RPM for gel strength at 10 seconds.

Q & A

What is the first step in the procedure described in the script?

The first step is to install the rotor as a cover for the Bob and ensure that the rotor is properly locked in place.

How should the sample mud be prepared for testing?

The mud sample should be inserted until it reaches the termocap vanfigimeter's limit, ensuring that the termocap is positioned correctly with respect to the foot of the termocap.

What should be done after the rotor and Bob are positioned in the sample mud?

After positioning the rotor and Bob, heat should be applied to the sample by adjusting the thermocap, and the rotation speed should be set according to the specific process for measuring the mud's rheology.

How is the speed of rotation adjusted for the measurements?

The rotation speed is adjusted using the gear shift knob, starting at 600 RPM. The readings should be monitored until the scale stabilizes, after which the value should be recorded.

What speed adjustments should be made for different measurements?

The gear shift knob should be adjusted to 600 RPM, 200 RPM, 100 RPM, and 6 RPM. For speeds above 100 RPM, the motor is set to high, and for lower speeds, it is set to low.

What should be done before recording the readings for each speed?

The readings should be observed until the scale reaches a stable position before recording the values for each speed setting.

How is the Bingham Plastic model used in this process?

The Bingham Plastic equation is used to calculate the values related to the gel strength of the mud based on the recorded readings from the different rotational speeds.

What is the procedure for measuring gel strength over 10 seconds?

To measure gel strength for 10 seconds, the rotor is rotated at 600 RPM for 10 seconds, followed by a stop at 0 RPM for 10 seconds. The highest dial reading at 3 RPM is recorded as the gel strength for 10 seconds.

What steps should be followed to measure gel strength over 10 minutes?

For measuring gel strength over 10 minutes, rotate the rotor at 600 RPM for 10 seconds, stop it at 0 RPM for 600 seconds (10 minutes), and then rotate it at 3 RPM. The highest dial reading at 3 RPM is recorded as the gel strength for 10 minutes.

What is the significance of the 0 RPM step in both gel strength tests?

The 0 RPM step allows the rotor to come to a stop, which helps in measuring the consistency of the mud's gel strength after being at rest for a certain period.