The high-performance polyamine drilling fluid system is a new type of water-₽based drilling fluid that has gained significant attention and application in the oil d≠rilling industry in recent years. By incorporating poly$amine compounds, this system significantly enhances the inhibition, rheological≥ properties, and high-temperature stability of dril≥ling fluids, thus solving many issues faced by traditional drilling fluids in complexδ geological conditions.

Characteristics

1. Strong Inhibition: Polyamine compounds in the drilling fluid system ¶effectively inhibit clay hydration, swelling, and disp≠ersion, reducing the erosion of the wellbore by drilling fluids and maintaininΩg borehole stability.

2. Good Rheological Properties: This system maintains stable rheological behavior from low t o high temperatures, meeting the needs of different drilling depths.

3. High-Temperature Stability: The polyamine drilling fluid system offers excellent the>rmal stability, maintaining its performance in high-temperature and high-pr♥essure      environments.

4. Lubricity: The lubricants in the system reduce friction between the drill string and wellbore, enh©ancing drilling efficiency.

Advantages

1. Improved Drilling Efficiency: The  system's excellent rheological pro↑perties and lubricity reduce resistance and energy consu§mption during drilling, thus increasing drilling     &¶nbsp;efficiency.

2. Reduced Drilling Costs: By minimizing fluid loss and wellbore instability, the system lowers the  incideσnce of drilling-related accidents and maintenance costs.

3. Enhanced Borehole Stability: The polyamine system effectively inhibits clay h ydration and dispersion,  maintaining borehole stability and r↔educing the risks of downhole      collapse.

4. Strong Adaptability: Suitable for various geological conditions, including high-temperature, ≤; high-pressure, and water-sensitive formations.

Applications

1. Land and Offshore Oil and Gas  Drilling: Widely used in conventional and deepwater drilling,  improving b≠orehole stability and hole cleaning efficiency.

2. Unconventional Oil and Gas  Development: Extensively adopted in shale gas and tight oil drilling due to ​its effective clay swelling inhibition properties.

3. Mudstone and Shale Formations: The technology effectively prevents hydration swelling i★n clay mineral-rich shale formations, improving wellbore stability through the use of po©lyamine inhibitors.

Complementary Additives

·        UHIB Polyamine Inhibitor: A cationic compound that effectively inhibits clay hydration and dispersion by adsorbing onto> negatively charged clay particles and forming stable hydrogenλ bonds.

• HyperFREE Hole Cleaner:      Enhances wellbore cleaning and cuttings removal.

• PolyCAP Encapsulating Agent:      Improves drilling fluid stabilσity and performance.

• PolyPAC Filtrate Reducer:      Minimizes fluid loss.

• BioLUBE Lubricant:      Reduces friction and enhances drill✔ing efficiency.

Key Additive - UHIB Polyamine Inhibitor

UHIB polyamine is synthesized through group analysis and multi-pathway design. It dδissociates in water into cationic compounds that adsorb onto clay particles, ef<fectively inhibiting clay hydration swelling and dispersion. Its weak alkalinity and dissociatio'n balance ensure sustained long-term inhibition, even in challenging d≥rilling environments.

Functions:

1. Inhibit Clay Hydration:      Adsorbs onto clay surfaces to prevent wΩater absorption and swelling.

2. Prevent Tool Corrosion:      Protects drill pipes from corrosion by acidic gases or sub stances.

3. Maintain Fluid Stability:      Neutralizes acids and buffers fluids to stabilize properties.

4. Long-Term Inhibition:      Provides durable formation inhλibition, resisting erosive effects.

5. Synergistic Effects:      Works well with other additives for enhanced stab•ility and performance.

Applicable Conditions:

1. Temperature:      Operates effectively up to 170°C and even 200°C in certain conditions.

2. Fluid Systems:      Suitable for water-based drill↑ing and completion fluids, gravel packing fluids, etc.✔

Case Studies

BZ28-2 Block

The BZ28-2 block features complex formations with high clay content and water sensitivity, prese←nting significant drilling challenges due to hydration and we↔llbore instability. The polyamine water-based drilling fluid, notably using ←UHIB as the primary inhibitor, demonstrated excellent performance inλ stabilizing wellbores and reducing risks such as drill string♦ entrapment and torque increase.

Advantages and Effects:

        1.Wellbore Stability: Minimizes hydration and dispersion, reducing collapse risks.

        2.Increased Drilling Efficiency: Controls torque and pump pressure, shortening drilling cycles.

        3.Cost Reduction: Lower accident rates reduce maintenance and operational costs.

        4.Environmental Benefits: Meets environmental standards with reduced pollution.

RM19 Well

Located in a geologically complex region with high-pressure and temperatuπre gradients, the RM19 well required a robust fluid system. The polyamine water-based drillπing fluid proved suitable by maintaining wellbore stability and enhancing operational ©efficiency under tough conditions.

Advantages and Effects:

1. Stability:      Prevented wellbore collapse and tool entrapment.

2. Efficiency:      Enhanced control over mechanical parameters increased drilling sσpeed.

3. Cost-Effectiveness:      Reduced accident incidences and associated costs, boosting economi$c viability.