In high-temperature oil reservoirs (60–90 °C), standard polymer gels often set too fast, risking near-wellbore damage and short effective plugging life. Our Metal Ion Crosslinking Modulator solves this with a dual-action design: it delays gel formation for deeper penetration and strengthens the final gel network for long-term stability.
How It Works
This modulator blends three functional components:
- Chelating Agent (e.g., HEDP salt, ATMP salt): Weakly coordinates with Cr³⁺, Al³⁺, or Zr⁴⁺ ions, slowing their reaction with polyacrylamide (HPAM). Extends gelation time from ~30–60 min to 2–5 h at 70 °C – enough for deep injection into high-permeability zones.
- Gel Stabilizer (e.g., tannic acid derivative, sodium alginate, modified lignosulfonate): Forms hydrogen bonds with HPAM chains and traps trace Fe²⁺/Fe³⁺ that cause degradation. Reduces syneresis (dewatering) and maintains plugging strength.
- Dispersant/Buffer (e.g., sodium sulfate, sodium bicarbonate): Ensures stable mixing and prevents premature precipitation.
Key Features
- Adjustable gelation time: Add 0.05%–0.3% (by total treatment fluid weight) to your existing HPAM‑Cr³⁺/Al³⁺ system – no formulation overhaul needed.
- Heat & salt resistant: After gelation, keeps syneresis below 10%–15% after 90 days at 80 °C and 100,000 mg/L salinity (control >30%–50%). Storage modulus (G’) retention >80%.
- Operationally simple: Available as a dry powder or 5%–20% concentrate. Mix at room temperature for 20–40 min, then dissolve in make‑up water before adding polymer.
Typical Application Recipe
- HPAM (hydrolysis degree 20%–30%): 0.3%–0.6%
- CrCl₃·6H₂O (or equivalent metal crosslinker): 0.05%–0.15%
- This modulator: 0.1%–0.15% (preferred range)
At 70 °C, gelation occurs in 2–5 hours, allowing deep penetration into high‑permeability channels before rigid gel forms.
Applications
- Deep fluid diversion and profile control in sandstone reservoirs with permeability >500×10⁻³ μm² and temperatures 60–90 °C.
- Water shutoff in high‑water‑cut wells where longer plugging life reduces workover frequency.
- Retrofitting existing HPAM‑metal crosslinking jobs without changing procurement or field procedures.
Why Choose This Modulator
- Designed for practical field use – simple addition, robust performance.
- Supports longer effective plugging life and less near‑wellbore damage.
- Formulated without restricted substances, compliant with general chemical safety regulations.
Available Forms: Solid powder or liquid concentrate. Store in sealed, light‑proof containers.
Post time: Jun-02-2026