How To Deal with The Stuck Or Dropped Drill of A Rotary Drilling Rig

Rotary drilling RIGS are highly efficient and convenient in pile foundation construction, but unexpected situations such as stuck and dropped drills occur from time to time, which not only affect the construction progress but may also cause equipment damage. Mastering scientific handling methods can effectively reduce risks and minimize losses.

1. Initial handling of stuck drill: Immediately stop drilling. Do not forcibly lift the drill pipe to prevent the stuck drill from worsening. You can try to slowly reverse the drill tool to loosen the engagement between the drill bucket and the hole wall by using the rotational force.

2. Determine the cause of the stuck drill: Through the data from the equipment instruments and on-site observations, distinguish whether it is caused by the collapse of the hole wall, the obstruction of a solitary rock, or the excessive depth of the drill bucket. After identifying the cause, targeted measures should be taken. For instance, if there is a collapse, wall protection should be carried out first; for isolated rocks, blasting or relocation should be considered.

3. Positioning after a drill drop: Record the position of the drill tool immediately after a drill drop, and precisely locate the depth and deviation using a measuring rope or instrument. Blind exploration and salvage are strictly prohibited to prevent secondary drops or jamming.

4. Selection of salvage tools: Choose appropriate tools based on the type of drill tool. For instance, the cave-type salvage tool is suitable for drill pipe joints, while the hook-claw type tool can be used to grasp drill buckets. Make sure the tools match the drilling tools to prevent them from slipping off during salvage.

5. Treatment of the internal environment of the hole: If there is mud sediment or collapsed debris in the hole, first clean it by circulating with a hole cleaning pump to keep the hole unobstructed. For strata prone to collapse, wall protection mud can be injected to enhance the stability of the hole wall.

6. Key preventive measures: Conduct geological investigation before construction and avoid complex rock strata; Regularly inspect the wear of the drilling tools and replace the vulnerable parts such as pins and steel wires in a timely manner. Strictly control the drilling speed and avoid overloading operation.

In conclusion, when dealing with stuck or dropped rotary drilling RIGS, the principle of "judgment first, then operation; it's better to proceed slowly than to rush" should be followed, and flexible responses should be made based on the actual situation on site. Regular equipment maintenance and geological prediction can reduce such problems from the source and ensure construction safety and efficiency.