Product Details

Sulfonated Lignite Resin (SPNH)

1. Product Overview

Sulfonated Lignite Resin (SPNH) is a high-performance, temperature-resistant fluid loss reducer synthesized from nitro-humic acid and phenol via sulfonated condensation. It is widely applied in oil and gas drilling operations, particularly for deep and high-temperature wells, to enhance drilling fluid performance, ensure borehole stability, and improve operational safety and efficiency.

2. Basic Properties

3. Core Functions & Applications

3.1 Viscosity Enhancement

SPNH features excellent viscosity-building properties, which significantly increase the viscosity of drilling fluids. Higher-viscosity fluids effectively carry sand particles and drill cuttings, reduce bit wear, and improve overall drilling efficiency.

3.2 Fluid Loss Reduction

During drilling, mud loss and formation fractures can lead to severe fluid depletion. SPNH forms a thin, tough protective film on the formation surface, effectively reducing fluid loss and minimizing operational risks and material waste.

3.3 Drilling Fluid Performance Stabilization

SPNH stabilizes drilling fluid systems, preventing foaming, stratification, and performance degradation. It ensures consistent fluid properties under complex conditions, supporting safe and continuous drilling operations.

3.4 Multi-functional Applications

SPNH provides comprehensive solutions for drilling challenges, including:

· High-temperature deep well operations

· High-salinity and brine drilling systems

· Unstable formations prone to hydration and swelling

· Compatibility with seawater, freshwater, and brine-based fluids

4. Product Advantages

✅ Environmentally Friendly & SafeNon-toxic, harmless, and eco-compliant; compatible with most drilling fluid additives, with simple and convenient field application.

✅ Excellent High-Temperature ResistanceStable performance at 180℃–220℃, making it ideal for deep and ultra-deep well operations.

✅ Outstanding Borehole StabilizationForms a thin, tough mud cake on wellbore walls to prevent collapse and ensure borehole integrity.

✅ Multi-functional PerformanceCombines fluid loss control, salt resistance, lubrication, and viscosity adjustment in one product.

✅ Broad CompatibilityFully compatible with seawater, freshwater, and 15% brine drilling fluid systems.

5. Packaging Specification

· Standard: 25 kg per bag, packed in paper-plastic composite bags.

· Customized packaging solutions are available upon request, including different weights and branded designs.

6. Storage & Transportation

· Store in a clean, dry, cool, and well-ventilated warehouse at ambient temperature.

· Keep away from fire sources, heat, direct sunlight, and rain.

· Minor moisture exposure does not affect product performance.

· Shelf life: 2 years under proper storage conditions.

7. Disclaimer & Technical Support

All specifications and descriptions in this document are for reference only. The product shall be used in accordance with the actual working conditions and technical requirements of the customer. We reserve the right to modify product specifications without prior notice.Customized formulations and professional technical solutions are available upon request to meet specific operational needs.

Application Cases of Lignite Resin for Drilling Fluids

1. Ultra-high Temperature (220℃) Stabilization and Filtration Control Case for Ultra-deep Wells

Case Background: Ultra-deep wells in Tarim and Sichuan Basin feature ultra-high bottom hole temperature up to 200–220℃, long high-temperature rolling cycle and severe thermal aging of drilling fluid. Conventional filtrate reducers and treating agents are prone to thermal degradation, molecular chain breaking and failure, causing sharp rise of HTHP fluid loss, thick and loose filter cake, frequent wellbore spalling and collapse, which seriously restricts safe and efficient drilling of ultra-high temperature ultra-deep wells.

Application Formula & Dosage: On the basis of high-temperature water-based drilling fluid system, 2.0%–3.0% lignite resin was added as the main high-temperature filtration reducer. Compounded with a small amount of high-temperature stabilizer, it builds a high-temperature resistant and stable drilling fluid system.

Application Effect: Lignite resin has excellent ultra-high temperature resistance, stable molecular structure without thermal failure after long-term aging at 220℃. It can significantly reduce HTHP filtration loss, optimize filter cake to be thin, dense and smooth, effectively isolate water molecule invasion, and inhibit clay hydration and dispersion. The drilling fluid rheology remains stable in the whole drilling process, 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. Anti-pollution System Stabilization Case for High-salt Gypsum Formations

Case Background: Salt-gypsum formations in inland oilfields have high salinity, strong ion interference and serious formation pollution. Conventional organic treating agents are easy to flocculate and deactivate under high salt conditions, resulting in increased viscosity, deteriorated filtration performance, system instability, wellbore shrinkage and collapse, which cannot adapt to long-cycle drilling in high-salt complex formations.

Application Method & Dosage: Lignite resin with strong salt resistance was applied at 1.8%–2.5% in saturated brine drilling fluid system. It cooperates with salt-resistant polymer to jointly stabilize system rheology and filtration performance.

Application Effect: The product has outstanding anti-salt and anti-ion interference capabilities, no flocculation or performance attenuation under full salinity pollution. It can stably control drilling fluid viscosity and shear force, effectively reduce medium and high temperature filtration loss, and maintain excellent filter cake quality. It inhibits salt layer dissolution and creep deformation, ensures long-term stable operation of drilling fluid system, and solves the technical problems of system instability and wellbore failure in high-salt gypsum formations.

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

Case Background: High-density drilling fluid for deep and ultra-deep wells has high solid content, poor colloidal stability and obvious temperature-sensitive thickening phenomenon. It is easy to cause excessive viscosity, high circulating pressure and difficult wellbore cleaning, which leads to cutting accumulation, barite settlement and downhole stuck pipe risks, affecting safe and rapid drilling of high-pressure deep wells.

Application Dosage: 2.0%–2.8% lignite resin was added to the high-density (1.80–2.30 g/cm³) drilling fluid system, used for rheology modification and viscosity stabilization of high-density systems.

Application Effect: Lignite resin has excellent viscosity-reducing and rheology-stabilizing effects on high-density drilling fluid. It can effectively improve the dispersion state of solid particles, eliminate temperature-sensitive thickening problems, keep the system viscosity and shear force within a reasonable range, reduce circulating friction and pump pressure, and avoid weighting material settlement. The wellbore cleaning effect is significantly improved, downhole complex risks are reduced, and the overall drilling efficiency of high-density deep wells is effectively increased.

4. Anti-sloughing and Filtration Reduction Case for Coal-measure Formations

Case Background: Coal-measure formations are featured with fragile lithology, developed micro-fractures, strong hydration tendency and severe wellbore collapse and block dropping. Conventional treating agents have poor anti-sloughing and filtration control effects, prone to filtrate invasion, formation hydration and wellbore enlargement, resulting in poor wellbore quality and low logging success rate.

Application Method & Effect: Lignite resin was applied at 1.5%–2.2% in coal-measure formation dedicated water-based drilling fluid system. It can adsorb on the surface of coal rock and clay minerals to form a dense protective film, reduce filtration loss, inhibit hydration spalling of broken strata, and stabilize wellbore morphology. It has good compatibility with coal-measure drilling fluid systems, does not affect logging and reservoir evaluation, and realizes safe and stable drilling of fractured and fragile coal-measure wells.

5. Long-term Stability Case for Offshore High-temperature Deep Well Drilling Fluid

Case Background: Offshore deep wells have long open-hole soaking time, high bottom hole temperature and strict requirements for long-term performance stability of drilling fluid. Conventional filtrate reducers are easy to age and fail in long-cycle high-temperature environments, leading to fluctuating system performance, deteriorated mud cake and increased downhole risks, which cannot meet the requirements of offshore continuous drilling operation.

Application Method & Effect: The conventional dosage is 1.8%–2.5%. Lignite resin features high temperature resistance, aging resistance and excellent long-term stability. It can maintain stable filtration and rheological properties during long-term open-hole soaking, continuously optimize mud cake compactness, effectively prevent wellbore instability and leakage. It adapts to seawater-based drilling fluid systems, meets offshore environmental protection construction standards, and ensures long-cycle safe and stable drilling of offshore high-temperature deep wells.