Study on Construction Adaptability of Rotary Drilling Rig under Karst Geological Conditions

Karst geology brings many challenges to engineering construction because of its unique characteristics such as karst cave and dissolution fissure. Under such geological conditions, the construction adaptability of rotary drilling rig becomes the key. Here are six aspects to explore in depth.

1. Formation stability: The strata in karst areas are often unstable due to the existence of karst caves and gullies. When the rotary drilling rig is operating, it is necessary to accurately judge the formation condition to prevent the drilling rig from tilting or sticking due to collapse.

2. Mud wall protection effect: Good mud wall protection can stabilize the hole wall. In karst geology, the special geological structure is easy to make the mud leakage, so it is necessary to adjust the mud performance and replenishment in time.

3. Borehole verticality: complex karst geology tends to skew boreholes. Rotary drilling rig should be equipped with advanced verticality monitoring system to ensure that the drilling meets the design requirements.

4. Bit selection and adaptation: For different karst geological characteristics, such as rock hardness, cave size, etc., different types of bits need to be selected to improve drilling efficiency.

5. Karst cave treatment strategy: When encountering karst caves, appropriate treatment methods should be adopted according to the scale and filling situation of karst caves, such as filling and steel casing follow-up.

6. Influence on construction efficiency: Complex karst geological conditions will reduce the construction efficiency of rotary drilling rig. Reasonable planning of construction process and optimization of equipment performance can be effectively improved.

Conclusion: Although there are many problems in the construction of rotary drilling rig under karst geological conditions, reasonable technical measures and scientific construction management can effectively improve its construction adaptability and ensure the smooth progress of the project.