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Open Hole Well Logging in Oil Drilling

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Questions and Answers

Why is mud pressure kept higher than the reservoir pressure during drilling?

To increase the permeability of the formation

To prevent formation damage caused by fluid influx (correct)

To reduce the cost of drilling operations

To accelerate the process of mud invasion

How does mud invasion impact the measurements obtained by logging tools?

It distorts the readings due to the presence of mud cake at the sand face (correct)

It has no effect on the measurements obtained

It enhances the accuracy of the measurements by stabilizing the formation fluids

It reduces the volume of filtrate in the formation

What factor must be considered to obtain true formation values from well logging measurements after mud invasion?

Mud type (water-based or oil-based) (correct)

Formation water content

Hole shape

Caving/washout in the wellbore

How does caving/washout in the wellbore influence the logging process after mud invasion?

It increases the diameter of the wellbore, leading to more mud volume between the formation and the tool Signup and view all the answers

Why is it important for logging tools to be able to measure undistributed formation after mud invasion?

To accurately assess reservoir characteristics despite mud invasion effects Signup and view all the answers

What does the tool depth of investigation depend on?

Source-receiver spacing Signup and view all the answers

Which factor is NOT the only one affecting the depth of investigation of logging tools?

Formation properties Signup and view all the answers

What is the primary function of the tool vertical resolution in logging tools?

Identify lithologies Signup and view all the answers

Why is having a lower depth of investigation considered beneficial for identifying all layers in the formation?

It bypasses the flush zone Signup and view all the answers

How should source-receiver spacing be designed to ensure that all layers are identified by logging tools?

Carefully planned and optimized Signup and view all the answers