Product Details

Silica Sealing Agent

1. Product Overview

Silica Sealing Agent is a high-performance inorganic nano-modified sealing and plugging material developed for water-based drilling fluid systems. The product adopts high-purity silica raw materials with optimized particle size gradation, featuring high activity, strong adsorption and excellent temperature resistance. It can effectively plug micro-pores, micro-fractures and permeability leakage channels on the wellbore, form a compact and tough low-permeability protective film, significantly improve wellbore stability and formation bearing capacity, and reduce drilling fluid filtration and leakage loss. It has good compatibility with various water-based drilling fluid systems, does not affect drilling fluid rheology, and is widely used in shale, sandstone and fractured complex formation drilling operations.

2. Technical Specifications

3. Key Performance Features

3.1 Micro-Pore & Micro-Fracture Sealing
With ultra-fine particle size and high specific surface area, the product can deeply penetrate and fill micro-pores and micro-fractures of formation rock, forming a dense physical sealing layer. It effectively solves permeability leakage and micro-fracture leakage problems, realizing precise plugging.

3.2 Excellent High Temperature Resistance
Made of high-stability inorganic silica material, it will not decompose, soften or fail under high-temperature conditions up to 220℃. It maintains stable sealing performance in high-temperature deep wells and ultra-deep wells, adapting to harsh downhole environments.

3.3 Wellbore Stabilization & Reservoir Protection

It forms a tough protective film on the wellbore surface to inhibit shale hydration and dispersion, prevent wellbore collapse and diameter shrinkage. Meanwhile, it reduces filtrate invasion into the reservoir, avoids formation damage, and effectively protects reservoir permeability.

3.4 Good Compatibility & No Adverse Impact
The inorganic silica material is chemically stable, compatible with all water-based drilling fluid systems and various drilling fluid additives. It does not affect the rheology, filtration performance and gel strength of drilling fluids, with reliable on-site application effect.

4. Recommended Applications

• Various water-based drilling fluid systems for oil and gas field drilling

• Micro-fractured formations and high-permeability leaking formations

• Hydration-prone unstable shale and mudstone formations

• High-temperature deep wells, directional wells and horizontal wells requiring wellbore stabilization and plugging

• Working conditions with strict reservoir protection requirements

5. Recommended Dosage
Conventional plugging and wellbore stabilization: 1.0%–3.0% (by mass of drilling fluid).
Severe micro-leakage and high-temperature formations: dosage can be increased to 3.0%–5.0%, or used in combination with other plugging agents for synergistic effect.

6. Packaging, Transportation & Storage
Packaging: 25kg/bag in moisture-proof composite paper bags, or customized packaging as per customer requirements.
Transportation: Avoid violent collision, extrusion, rain and direct sunlight during transportation to prevent package damage and moisture absorption.
Storage: Store in a cool, dry, well-ventilated place, kept sealed and moisture-proof. Keep away from fire sources and strong oxidizing agents.

7. Safety Precautions
Wear protective gloves and dust masks during operation to avoid dust inhalation and skin contact. In case of accidental contact with eyes or skin, rinse immediately with plenty of clean water and seek medical attention if necessary. Keep the working environment ventilated to prevent dust accumulation.

8. Disclaimer & Technical Support
All specifications and descriptions in this document are for reference only. The product shall be used in accordance with the customer’s actual working conditions and technical requirements. Customized formulations and solutions are available upon request.

Application Cases of Silica Plugging Agent in Drilling Fluids

1. Accurate Plugging and Anti-collapse Case for Shale Nano-micro Fractures

Case Background: Shale formations are densely developed with nano-scale and micro-scale micro-fractures, featuring strong water sensitivity and easy hydration spalling. Conventional plugging agents have large particle sizes, which can only block macro-fractures but fail to effectively plug nano-micro pore channels. Drilling fluid filtrate continuously invades the formation along tiny fractures, resulting in progressive hydration of shale, wellbore enlargement, block falling and frequent wellbore instability accidents, severely restricting safe drilling of shale horizontal wells.

Application Formula & Dosage: On the basis of water-based drilling fluid systems for shale wells, 1.0%–2.0% nano-silica plugging agent is added. Relying on ultra-fine nano particle size grading, it realizes in-depth filling and seamless plugging of formation nano-micro fractures.

Application Effect: Silica plugging agent has ultra-small particle size and strong diffusion penetration performance, which can accurately fill nano-micro fractures that cannot be blocked by conventional agents. It forms a dense and rigid physical plugging layer on the wellbore surface, effectively blocking filtrate invasion channels and inhibiting clay hydration and dispersion. It significantly reduces wellbore enlargement rate, improves shale formation strength retention rate, thoroughly solves the problem of difficult plugging of shale micro-fractures, and ensures long-term stable wellbore morphology during long horizontal section drilling.

2. HTHP Dense Mud Cake and Fluid Loss Reduction Case for Ultra-deep Wells

Case Background: Ultra-deep well HTHP formations have bottom hole temperatures up to 180–220℃ and extreme downhole pressure. Conventional organic plugging and fluid loss reducers are prone to high-temperature aging, molecular chain fracture and performance failure. The formed mud cake is loose and porous with high HTHP fluid loss, leading to severe filtrate invasion, wellbore hydration damage and increased downhole complex risks, failing to meet ultra-deep well long-cycle HTHP drilling requirements.

Application Method & Dosage: 1.2%–2.2% high-temperature resistant modified silica plugging agent is added to high-density HTHP drilling fluid systems. It features inorganic rigid structure, ultra-high temperature resistance and no thermal aging failure, used for HTHP mud cake optimization and deep plugging.

Application Effect: The inorganic silica plugging agent has excellent structural stability under ultra-high temperature conditions. It can fill the micro-pores of conventional mud cake, greatly improve mud cake compactness and smoothness, reduce mud cake thickness by 30%–40%, and significantly cut down HTHP filtration loss. It effectively isolates high-temperature filtrate invasion, protects wellbore stability under long-term HTHP shear conditions, stabilizes drilling fluid rheological and filtration performance, and provides reliable guarantee for safe and efficient drilling of ultra-deep high-temperature wells.

3.  Salt-resistant Wellbore Stabilization and Plugging Case for High-salt Gypsum Formations

Case Background: Salt-gypsum formations have high mineralization and strong electrolyte interference. Conventional organic plugging agents are sensitive to salt pollution, prone to molecular precipitation, demulsification and performance attenuation in high-salt environments, resulting in damaged mud cake structure, reduced plugging efficiency, and repeated wellbore spalling and instability in salt-bearing formations, which seriously affects drilling construction progress.

Application Dosage: 1.0%–1.8% nano-silica plugging agent is added to saturated brine drilling fluid systems. With stable inorganic chemical properties, it is not affected by high salt and high ion interference, maintaining efficient plugging performance in salt-contaminated systems.

Application Effect: Silica plugging agent has excellent salt resistance and electrolyte pollution resistance, no precipitation or failure in high-mineralization systems. It can stably optimize mud cake structure, plug formation micro-pores and micro-fractures, effectively inhibit salt-water invasion and formation hydration expansion. It solves the technical problem of poor wellbore stability in salt-gypsum formations, stabilizes the overall performance of high-salt drilling fluids, and realizes continuous and safe drilling of complex salt-bearing formations.

4. Low-damage Temporary Plugging and Reservoir Protection Case for Tight Low-permeability Reservoirs

Case Background: Tight low-permeability reservoirs have tiny pore throats and fragile reservoir structures. Conventional plugging agents have unreasonable particle grading, easily cause permanent blockage of reservoir pore throats, reduce core permeability recovery rate, and cause serious reservoir damage, which cannot meet the technical requirements of low-damage protective drilling for tight oil and gas reservoirs.

Application Method & Effect: The conventional dosage is 0.8%–1.5%. The modified silica plugging agent has matched nano-scale particle grading, which can form a reversible temporary plugging layer on the wellbore surface. It effectively prevents drilling fluid solid-liquid phase from invading the reservoir, and the plugging layer is easy to break and remove in the later stage. It features low reservoir damage and high permeability recovery rate, realizing efficient plugging and green protection of tight reservoirs.

5.  Wellbore Cleaning, Leakage Prevention and Stable Drilling Case for Extended-reach Horizontal Wells

Case Background: Extended-reach horizontal wells have ultra-long open-hole sections, long-term drilling fluid soaking and complex downhole stress. The formation micro-fractures are easily opened under working pressure, resulting in minor leakage and poor wellbore cleaning. Conventional plugging agents have slow plugging response and poor dynamic plugging ability during long-cycle circulation, leading to unstable downhole working conditions and restricted horizontal section extension.

Application Method & Effect: The dosage of silica plugging agent is 1.0%–2.0%. It has good suspension and dynamic migration performance in drilling fluids, which can dynamically plug newly opened micro-fractures during circulating drilling. It optimizes wellbore mud cake smoothness, reduces downhole friction and minor leakage risks, improves wellbore cleaning effect, stabilizes downhole torque and working conditions, and ensures safe and rapid extension of ultra-long horizontal sections.