BlockSeal Simulated Sand Plugging Program is an efficient wellbore leakage sealing technology. It uses a "wedge-shaped" plug design for varying fissure widths, combined with a controlled filtration plugging slurry system. This design transitions from "simulated sand plugging" to "induced sand plugging" and finally "forced sand plugging," enhancing the success rate of sealing operations.

Features

1. Specialized Plugging Slurry: Adjusts filter loss time based on on-site leakage to prevent prolonged retention in fissures.

2. Multistage Granular Design: Optimizes particle size distribution to suit various fissure sizes, improving success rates.

3. Inert Materials: Inert plugging materials are highly compatible with water and oil-based drilling fluids.

4. High-Pressure Deformation: Inducers have the ability to deform under high pressure, preventing sealing failures.

5. Spindle-Shaped Volume Design: Maximizes the volume of sealing slurry that fits fissures, enhancing efficiency.

Advantages

1. Multistage Match: Better adapts to different fissure sizes, preventing sealing failures and increasing success rates.

2. Rapid Barrier Formation: Controlled filter loss creates solid barriers quickly within fissures.

3. High-Pressure Support: Elastic materials support high-pressure fissure conditions effectively.

4. High-Strength Barriers: From simulated to induced to forced sand plugging, forms solid, shear-resistant barriers.

Applications

1. Fractured Formations: Effective for fissure formations with its granular plug design.

2. Karst Formations: Forms layers gradually within caverns; may need additional methods for  large features.

3. High-Temp/High-Pressure: Composite agents offer stability under extreme conditions.

4. Complex Geological Wells: Adapts to irregular pressure and fissure developments.

5. Deep/Ultra-Deep Wells: Optimized formulas provide effective solutions under challenging conditions.

Case Study

Case 1: Pressure Build-Up

• Well: Jiaoye 197-1HF

• Challenge: Leakages at multiple depths, failure with conventional methods.

• Solution: Utilization of BlockSeal with a special slurry successfully isolated the leakage sections with improved pressure build-up.

Case 2: Induced Fissures

• Well: Jiaoye 198-2HF

• Challenge: Persistent leaks and sealing failures.

• Solution: BlockSeal solved the issue in three cycles with stable pressure, no further leakage during subsequent drilling.

Case 3: Fault Leakage

• Well: Jiaoye 26-8HF

• Challenge: Major fissures or faults causing a dramatic drop in pressure.

• Solution: BlockSeal effectively sealed the leakage with a three-tier slurry application, maintaining stability during continued drilling.

BlockSeal demonstrates extensive applicability in challenging geological conditions, providing reliable solutions in situations of severe loss, complex geology, and deep well scenarios.