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GLYDRIL Polyglycol Water-Based Drilling Fluid
GLYDRIL polyglycol water-based drilling fluid is an innovative system developed to address challenges associated with drilling in complex geological conditions. It utilizes polyglycol as the primary treatment agent, supplemented by various high-molecular-weight polymer additives, to establish an efficient, eco-friendly, and stable water-based drilling fluid system. This system is designed to enhance drilling safety, efficiency, and environmental performance, meeting the higher demands of modern oil and gas exploration and production.
Features
Strong Inhibitory Effect: Polyglycol molecules effectively inhibit swelling in shale and other water-sensitive formations, enhancing wellbore stability and reducing risks of collapse and sloughing.
High Temperature and High Density Stability: The unique chemical structure and additive formulation enable polyglycol drilling fluid to maintain stable performance under high temperature and high-density conditions, ensuring smooth drilling operations.
Robust Salt Resistance: The system retains its performance in high-salinity formations, resisting failures due to salt interference.
Excellent Lubricity: Significantly reduces friction between the drill string and the wellbore, increasing penetration rates and reducing drilling accidents.
Good Rheological Stability: Polyglycol adsorbs onto solid particles, providing excellent stability to the drilling fluid system.
Environmentally Friendly: With water as the base fluid, it is low in toxicity and biodegradable, complying with stringent environmental regulations.
Advantages
Increased Drilling Efficiency: Superior lubricity and inhibition reduce drilling resistance, accelerate he drilling process, and shorten the drilling cycle.
Formation Protection: Minimizes damage to hydrocarbon reservoirs, preserving their original permeability and enhancing recovery rates.
Cost Reduction: Lowers overall drilling costs by reducing downhole complications and drilling fluid losses.
Versatile Application: Suitable for various complex geological conditions and specialized drilling techniques, including horizontal, directional, and extended-reach drilling.
Eco-Friendly: Low toxicity and easy disposal reduce environmental impact.
Applications
High Temperature and High Pressure Wells: Special additives and chemical stability allow for consistent performance in extreme conditions.
Shale Formations: The system effectively controls shale hydration and swelling, improving wellbore stability.
Offshore Drilling: Meets the environmental standards required for marine drilling operations with low bio-toxicity and biodegradability.
Specialized Drilling Techniques: Provides effective support in complex trajectories and conditions encountered in horizontal, directional, and extended-reach wells.
Low Permeability Reservoirs and Sensitive Areas: Protects the integrity of hydrocarbon zones, allowing for improved recovery.
Complementary Additives
Polyglycol: A high-molecular-weight alcohol compound polymerized through specialized processes, offering water solubility and stability.
VisPLUS Encapsulator: Enhances viscosity stability and cuttings transport capabilities of the drilling fluid.
HyperFREE Wellbore Cleaner: Improves the efficiency of cuttings removal.
PolyPAC Filtrate Reducer: Minimizes fluid loss.
Key Additive: Polyglycol
Polyglycol is a specially designed chemical additive for drilling operations, primarily consisting of high molecular weight alcohols. It is typically a colorless to pale yellow transparent liquid with excellent water solubility and stability.
Functions:
Lubrication and Drag Reduction: Forms a lubricating film on drill string surfaces, significantly reducing friction.
Shale Hydration Inhibition: Effectively inhibits shale hydration and dispersion, maintaining wellbore stability.
Drilling Fluid Performance Improvement: Adjusts rheology, enhances cuttings transport, and reduces fluid viscosity.
Eco-Safe: Biodegradable and non-toxic, meeting modern environmental and safety standards.
Suitable Environments:
Complex Geological Drilling: Effective in shale, mudstone, and fractured formations.
Horizontal Wells: Reduces frictional resistance, increasing penetration rates.
Deep Sea Drilling: Maintains stable performance under high-pressure, low-temperature conditions.
Environmentally Sensitive Areas: Minimizes environmental impact during drilling in protected areas.
Case Studies
Daqing Oilfield Guan 84-14 Well
The transition from polymer-based to polyglycol-based drilling fluid at depths beyond 1200 meters accommodated the complex geological demands.
Key Benefits and Results:
Strong Collapse Prevention and Regular Borehole Diameter: Enhanced wellbore stability, reducing collapse risks.
Improved Lubricity: Increased mechanical penetration rates and reduced downhole incidents.
Better Mud Cake Quality: Thin, tenacious mud cakes reduce fluid loss and facilitate wellbore stability.
Improved Hydrocarbon Recovery: Alters wettability and reduces Jamin effect, aiding in hydrocarbon flow.
Outstanding Environmental Performance: Very low ecological toxicity, compliant with green drilling initiatives.
Wen 33-196 Well
Transitioned to polyglycol-based drilling fluid to handle increasing complexity at greater depths and angles.
Key Benefits and Results:
Superior Lubricity and Inhibition: Minimizes tool wear and drilling resistance while controlling shale swelling.
Reservoir Protection: Preserves the permeability of oil and gas zones during drilling.
Extensive Applicability: Demonstrated versatility under varying geological conditions, supporting broader deployment
BorSTAB Silicate Drilling Fluid
BorSTAB silicate drilling fluid is an innovative drilling fluid system developed to address inadequacies of traditional silicate drilling fluids in terms of pH control, rheological properties, lubricity, and foaming issues. The BorSTAB system not only enhances drilling efficiency but also improves wellbore stability, all while delivering excellent environmental protection.
Features
Strong Inhibitory Effect: Achieves a shale cuttings recovery rate of up to 98% and a swelling prevention rate of 92%, effectively mitigating wellbore instability in mudstone sections and reducing complexity rates.
Excellent Lubricity: Features an extreme pressure friction coefficient of less than 0.1, significantly improving the high friction torque issues in long horizontal well sections and reducing drill string wear.
Outstanding Sealing Capability: API low-pressure filtration loss is less than 3 mL, and high-temperature, high-pressure filtration loss is less than 8 mL, effectively sealing formation pores and reducing pressure transmission, which stabilizes the wellbore.
Environmentally Friendly: All treatment agents are non-toxic and biodegradable, meeting national regulatory discharge requirements.
High Temperature Stability: The system can withstand temperatures up to 170°C, maintaining stability even under formation fluid and poor solid contamination.
Advantages
Increased Drilling Efficiency: Precise control over silicate and pH levels ensures efficient and smooth drilling, reducing downtime and operational defects.
Enhanced Wellbore Stability: Quickly blocks pores and microfractures near the wellbore to prevent fluid invasion and pressure penetration, while inhibiting shale clay mineral hydration and swelling to form a dense "sealant shell."
Reduced Drilling Costs: Its excellent wellbore stabilization reduces mud density requirements and prevents sticking and differential sticking issues, lowering overall drilling expenses.
Environmentally Friendly: The use of non-toxic, biodegradable agents conforms to environmental regulations, minimizing negative environmental impact.
Wide Applicability: Effective in complex formations and specialized wells, addressing performance control challenges faced by traditional silicate drilling fluids.
Applications
Complex Formations: Ideal for unstable, collapse-prone formations like shale and salt formations, where BorSTAB can significantly improve wellbore stability and reduce complications such as collapse and stuck pipe.
High Temperature and High Pressure Environments: Maintains stable rheological and inhibitory performance under extreme conditions, suitable for deep and ultra-deep wells.
Environmentally Sensitive Areas: The use of non-toxic, biodegradable treatment agents meets environmental regulations, making it suitable for regions with stringent environmental requirements.
BorSTAB silicate drilling fluid has demonstrated broad and varied applications in drilling engineering. Field results show it effectively addresses drilling complexities while enhancing efficiency and reducing costs, earning recognition and praise from stakeholders.
Complementary Additives
BorSTAB Shale Inhibitor: Designed to address wellbore instability by condensing silicate with aluminate groups in the formation, passivating clay minerals and nhibiting hydration.
RHESTAB Stabilizer
BIOFLO Filtration Reducer
BIOSLIP High-Performance Lubricant
Key Additive: BorSTAB Shale Inhibitor
The BorSTAB Shale Inhibitor is specifically designed to tackle wellbore instability. Its core mechanism involves the condensation of silicate components with aluminate groups in the formation, effectively passivating and inhibiting clay mineral hydration. The silicate also bonds across minor fissures, enhancing the overall rock stability through extensive gelation, thereby preventing wellbore collapse.
Functions:
Inhibition: Effectively inhibits clay hydration and dispersion in mud, preventing wellbore instability due to clay swelling.
Sealing: Enhances borehole integrity by sealing throats and microfractures, reducing fluid loss.
Lubricity: Improves the lubricating properties of the drilling fluid, reducing friction and torque, and extending drill string life.
Enhanced Rock Strength: Substantial silicate cementation significantly strengthens rock, providing a safer, more reliable borehole environment.
Applicable Range:
Applicable Temperature: Up to 170°C.
Compatible Systems: Silicate drilling fluid systems, with good compatibility.
Case Study
In the Pearl River Mouth Basin, the Paleogene formations have yielded promising oil and gas discoveries, with fields like Huizhou 25-4 and Lufeng 13-1 exploiting deep reservoirs with strong economic returns. The lithology primarily consists of interbedded gray mudstones and siltstones, prone to collapse and shrinking. Traditional drilling fluids often struggle with wellbore instability, leading to issues like collapse and pipe sticking, especially under high-pressure differential during logging, resulting in low ROP.
The innovative silicate drilling fluid system was developed to address these challenges. In the South China Sea's eastern oil fields, the system, used in wells like LF7-9-2 and XJ33-1-4d, demonstrated excellent wellbore stability. The drilling operations were smooth, with no pipe sticking or electrical cable issues, reflecting the superior stability of the silicate drilling fluid.
Real-time monitoring of pH and silicate concentration ensured precise control, with pH consistently above 11 and silica concentration over 1000 mg/L, facilitating ease of management. The silicate concentration remained above 11000 g/L throughout, confirming its ease of use and effectiveness.