Product Details

Sulfonated Polyacrylamide(Crosslinked Acid Thickener) 

1. Product Overview

Sulfonated Polyacrylamide is a crosslinked acid thickener specially developed for fracturing and acidizing operations in oil and gas fields. With excellent acid and alkali resistance, it is suitable for fracturing and acidizing operations in oil and gas reservoirs, shale oil and gas, and carbonate reservoirs with temperatures up to 200℃. It can be used directly as a crosslinked acid thickener, or as a solid powder to produce emulsion thickeners and compound crosslinking agents, adapting to various construction processes.

2. Technical Specifications

Note: a "Iron ion stabilization capacity" is tested according to single-agent standards; b "Organic chlorine content" is only tested for oil well applications, not for gas well applications.

3. Key Performance Features

3.1 Excellent Temperature and Acid/Alkali Resistance
It can work stably in high-temperature acid environments up to 200℃, adapting to high-acid-concentration and high-salinity fracturing acid systems while maintaining stable performance.

3.2 Controllable Crosslinking & Efficient Gel Breaking
Crosslinking time can be precisely controlled according to construction temperature, forming high-viscosity crosslinked acid during construction to ensure sand carrying and fluid loss control. After construction, it can be completely broken without residual bulk gel, avoiding formation plugging damage.

3.3 Significant Retardation Effect

With a retardation rate ≥94% at 90℃ for 10min, it effectively slows down the acid-rock reaction rate, extends the effective action distance of the acid, and improves the acidizing stimulation effect.

3.4 Low Corrosion & Low Formation Damage
It has a low dynamic corrosion rate, with minimal corrosion to downhole strings and equipment. With an iron ion stabilization capacity ≥90mg/mL and residual acid demulsification rate ≥90%, it effectively reduces iron precipitation and emulsification damage, minimizing secondary formation pollution.

4. Recommended Applications

• Crosslinked acidizing and fracturing-acidizing operations in oil/gas reservoirs, shale oil/gas, and carbonate reservoirs

• Acidizing stimulation in high-temperature deep and ultra-deep wells with temperatures ≤200℃

• Construction scenarios with strict requirements for formation damage and equipment corrosion control

5. Recommended Dosage
Conventional crosslinked acid systems: 0.3%~0.8% (by mass of acid fluid).
High-temperature and high-salinity systems: dosage can be increased to 0.8%~1.2%, or used in combination with other additives.

6. Packaging Specification

Standard: 25kg/bag in moisture-proof composite paper bags. Customizable packaging specifications are available according to client requirements.

7. Storage & Transportation
Store in a cool, dry, well-ventilated place, protected from moisture, high temperature, and direct sunlight. Keep away from strong acids, strong alkalis, and strong oxidizing agents to prevent product degradation.

8. Precautions
When preparing acid fluid, add this product slowly according to process requirements and stir thoroughly to dissolve, avoiding agglomeration. Wear protective gloves, goggles, and dust masks during operation to avoid dust inhalation and skin/eye contact. In case of accidental contact with skin or eyes, rinse immediately with plenty of clean water and seek medical attention if necessary.

9. 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 Sulfonate Polymer Fluid Loss Reducer for Drilling Fluids

1. 220℃ High-temperature Stabilization and Filtration Control Case for Ultra-deep Polysulfonate Systems

Case Background: Ultra-deep wells in Tarim and Sichuan deep blocks have bottom hole temperatures up to 200–220℃, long high-temperature rolling cycles and harsh downhole aging conditions. Conventional filtration reducers are prone to molecular chain fracture and thermal failure at ultra-high temperatures, causing sharp rise of HTHP filtration loss, loose and thick filter cake, and deteriorated colloidal stability. This easily induces wellbore spalling and collapse, severely restricting safe and efficient drilling of ultra-deep high-temperature wells.

Application Formula & Dosage: On the basis of high-temperature polysulfonate drilling fluid system, 1.5%–2.5% sulfonate polymer fluid loss reducer was added as the core filtration control agent. It cooperates with high-temperature stabilizers to optimize colloidal structure and build a long-term stable high-temperature resistant drilling fluid system.

Application Effect: The product contains stable sulfonate functional groups with excellent ultra-high temperature resistance, no thermal degradation or gel failure after long-term aging at 220℃. It can effectively adsorb on clay particle surfaces to protect drilling fluid colloids, significantly reduce HTHP filtration loss, and optimize filter cake to be thin, dense and smooth. The system rheology remains stable throughout the drilling cycle, wellbore enlargement rate is effectively controlled, and no high-temperature downhole complex accidents occur, greatly improving the drilling success rate of ultra-deep high-temperature wells.

2. Strong Anti-pollution System Stabilization Case for High-salt and High-calcium Contaminated Formations

Case Background: Salt-gypsum and brine formations in inland oilfields feature high salinity, severe calcium and magnesium ion pollution and strong electrolyte interference. Conventional polymer treating agents are sensitive to salt and calcium pollution, prone to flocculation, thickening and filtration loss surge, resulting in system performance instability, poor mud cake quality, and frequent wellbore shrinkage and collapse, failing to adapt to long-cycle complex formation drilling.

Application Method & Dosage: Sulfonate polymer fluid loss reducer with excellent salt and calcium resistance was applied at 1.2%–2.2% in saturated brine drilling fluid systems. It is compounded with anti-electrolyte additives to maintain stable filtration and rheological performance under full salinity pollution.

Application Effect: The product has strong ion interference resistance, no flocculation or performance attenuation under high-salt and high-calcium composite pollution. It can stably regulate system viscosity and shear force, effectively reduce medium and high temperature filtration loss, and maintain compact filter cake structure. It inhibits salt layer dissolution and creep deformation, ensures long-term stable operation of high-salt drilling fluid systems, and solves the technical problems of system instability and frequent downhole complexities in salt-gypsum formations.

3. Rheology and Colloid Protection Optimization Case for High-density Deep Well Drilling Fluid

Case Background: High-density drilling fluid (1.80–2.35 g/cm³) for deep high-pressure wells has high solid content, poor colloidal stability and obvious temperature-sensitive thickening. Long-term high-temperature downhole operation easily causes excessive system viscosity, high circulating pump pressure, barite settlement and poor wellbore cleaning, bringing major hidden dangers to safe drilling of high-pressure deep wells.

Application Dosage: 1.5%–2.0% sulfonate polymer fluid loss reducer was added to high-density drilling fluid systems, dedicated to high-temperature colloid protection and rheological balance optimization of high-solid systems.

Application Effect: The product has excellent high-temperature colloid protection and moderate thickening properties. It can optimize the dispersion state of solid particles, inhibit high-temperature crosslinking and thickening of organic agents, and stabilize system rheological parameters within a reasonable range. It reduces circulating friction and pump pressure, effectively avoids weighting material settlement and cuttings accumulation, stabilizes downhole working conditions, and significantly improves the comprehensive drilling efficiency of high-pressure deep wells.

4. Anti-CO₂ Pollution Performance Stabilization Case for Gas-bearing Formations

Case Background: Gas-bearing formations in Jilin and peripheral blocks have active gas invasion and severe CO₂ pollution. Conventional filtration reducers are prone to molecular structural damage and performance failure after acid gas pollution, resulting in sudden increase of filtration loss, system dilution and unstable wellbore, which easily induce downhole leakage and collapse accidents and affect safe gas reservoir drilling.

Application Method & Effect: Sulfonate polymer fluid loss reducer was applied at 1.3%–2.0% in gas-bearing formation drilling fluid systems. It has stable molecular structure and strong acid gas pollution resistance. After CO₂ contamination, it still maintains good hydration and filtration control capabilities, stably controls drilling fluid performance, optimizes mud cake quality, and effectively guarantees safe and stable drilling of complex gas-bearing formations.

5. Long-term Reservoir Protection Case for Offshore Seawater-based High-temperature Deep Wells

Case Background: Offshore deep wells adopt seawater for mud preparation, with high seawater salinity, long open-hole soaking time and high bottom hole temperature. Conventional treating agents have poor seawater adaptability, easy aging failure and large filtration loss fluctuation in high-temperature and high-salt composite environments, resulting in severe filtrate invasion and reservoir permeability damage, failing to meet offshore low-damage drilling requirements.

Application Method & Effect: The conventional dosage is 1.5%–2.2%. The sulfonate polymer product has excellent seawater adaptability, high-temperature aging resistance and low reservoir damage characteristics. It can stably control the filtration performance of seawater-based drilling fluid in long-cycle high-temperature environments, form a dense protective mud cake to reduce filtrate invasion. It features no fluorescence, good logging compatibility and high core permeability recovery rate, realizing high-efficiency, environmental-friendly and low-damage drilling for offshore high-temperature deep wells.