Open-Hole Fishing

This is incorrect. Drillstring components are often lost in open holes.

This is incorrect. Tools used for well completion can also be lost in open holes.

This is incorrect. Workover operations can lead to equipment loss in the open hole.

This is the correct answer. Casing installation takes place after the open hole section, so it is unlikely to cause equipment loss in the open hole.

This is the correct answer. The open hole lacks the control and visibility offered by cased hole sections.

This is incorrect. Specialized equipment for open-hole fishing is readily available.

This is incorrect. Open holes are more prone to instability compared to cased hole sections.

This is incorrect. Open-hole fishing poses a higher risk of damage to the wellbore and lost equipment.

This is incorrect. Swabbing is a wellbore stimulation technique.

This is the correct answer. Jarring uses a specialized tool to dislodge lost equipment.

This is incorrect. Acidizing is a wellbore stimulation technique.

This is incorrect. Fracking is a wellbore stimulation technique.

This is incorrect. Magnetic fishing effectiveness is not related to well depth.

This is incorrect. Magnetic fishing can still damage the wellbore if not used carefully.

This is the correct answer. Magnetic fishing utilizes magnets to retrieve metal objects.

This is incorrect. Magnetic fishing is only suitable for retrieving ferrous metal objects.

This is incorrect. Wellbore diameter is crucial for selecting the appropriate fishing tool and technique.

This is incorrect. The type and size of the lost equipment influence the choice of fishing method.

This is incorrect. The presence of hydrocarbons in the wellbore should be considered for safety and operational planning.

This is the correct answer. Open-hole fishing takes place BEFORE casing installation, so it is not relevant.

Two possible techniques for recovering the drill collar: 1. **Jarring:** - Since the drill collar is made of steel and likely stuck in the formation, a jarring technique could be effective. - A powerful shock wave from the jarring tool might dislodge the drill collar, allowing it to be pulled out of the wellbore. - **Risk:** Jarring can potentially damage the wellbore or the lost equipment if the jarring force is too strong. 2. **Overshot Fishing:** - An overshot is a specialized tool designed to engage and secure the lost equipment. - By positioning the overshot jaws around the drill collar and applying tension, the overshot can lift and retrieve the lost equipment. - **Risk:** If the overshot fails to engage properly or if the drill collar is severely damaged, it may be difficult to retrieve. **Additional Considerations:** - The sand and clay formation may make it difficult to secure a good grip on the drill collar. - The wellbore diameter should be considered to ensure the chosen fishing tool can pass through without causing obstructions. - It's crucial to assess the risk of further damage to the wellbore or the lost equipment during any fishing operation.