If you already know that the stuck pipe is caused by wellbore geometry, the following instructions are guidelines on how to free the stuck drill string.
What should you do to free the stuck pipe caused by Pack off / Bridging?
- Circulate with low flow rate (300 – 400 psi pumping pressure). It is very important to apply low flow rate because if high flow rate is applied, the stuck situation becomes worse.
- If the drill string gets stuck while moving up or with the string in static condition, jar down with maximum trip load and torque can be applied into drill string while jarring down. DO NOT JAR UP. Be cautious while applying torque, do not exceed make up torque.
- On the other hand, if the drill string gets stuck while moving down, jar up with maximum trip load. DO NOT apply torque in the drill string while jarring up.
- To free the string, jarring operation may take a long time (10 hours +) so please be patient.
What should you do after the string becomes free?
- Increase flow rate and circulate to clean wellbore at maximum allowable flow rate. Flow rate must be more than cutting slip velocity in order to transport cuttings effectively.
- Reciprocate and rotate while circulating to improve hole cleaning ability. Work the drill string with full stand if possible.
- Ensure that the wellbore is clean prior to continuing the operation. You can see from the sale shaker whether the hole is clean or not.
- Sweep may be utilized to improve hole cleaning.
- Back ream or make a short trip through the area where it caused the stuck pipe issue.
Drilling formulas Stuck Pipe Prevention Book => Stuck Pipe Prevention Book