Core Secrets to High-Efficiency Drilling

Core Secrets to High-Efficiency Drilling

I. Understanding the Geological Report

Focus on three key points: stratigraphic sequence and thickness, rock hardness and integrity, and groundwater level and special layers (such as quicksand, gravel, and fractured zones). This is the foundation for selecting all methods.

II. Matching Equipment and Technology

Soft soil and sand layers: Prone to borehole collapse. Select rotary drilling rigs or long augers, use high-quality mud for wall protection, and run casing if necessary.

Gravel and gravel layers: Loose, prone to mud leakage. Select percussion drilling rigs or reverse circulation drilling rigs; casing-following drilling is key.

Hard rock layers: Slow drilling. Select roller cone bits or down-the-hole hammers, using high drill pressure and low rotation speed.

Fractured zones and mud-leaking layers: Extremely poor borehole wall conditions. Full casing drilling rigs are preferred, with casing protection throughout the entire process.

Thick silt: Prone to borehole shrinkage. Use vibratory casing or rotary drilling rigs with long casings, with casing following the entire process. III. Developing Optimization Plans

Combined Techniques: When encountering complex formations such as soft upper layers and hard lower layers, a combination of methods such as "rotary drilling on top and impact drilling on the bottom" is often used.

Drill Bit Adjustment Based on Formation: Use scraper bits for soft soil and roller cone or rock-embedded bits for hard rock.

Drilling Mud Adjustment: Increase viscosity to prevent collapse in loose layers and add plugging agents to seepage layers.

Schedule Forecasting: Estimate drilling speed based on rock hardness and rationally schedule the work period.

IV. Core Recommendations

Dynamic Adjustment: Observe changes in cuttings return and drilling speed during construction and make timely fine-tuning adjustments to the methods.

Contingency Plan Preparation: For difficult formations identified in the report, prepare plugging agents, casing, and other materials and backup plans in advance.

Expert Consultation: When encountering complex situations such as karst or high-pressure water, it is essential to consult professional geologists and drilling personnel.

Summary: The key to efficient drilling lies in "tailoring the solution to the problem." Accurately interpreting the geological report, selecting the most suitable equipment and techniques based on the formation, and flexibly adjusting during construction are essential to achieving safe, fast, and economical construction goals.