A Temperature-Salinity Responsive MCPs System for Water Shutoff in Tight Gas Reservoirs

Le résumé fourni par la source

To address the challenges of water invasion and breakthrough in tight gas reservoirs, a thermosalinity-responsive modified carbon particles (MCPs) water shutoff system was developed. After oxidation and KH-550 silane modification, the system exhibited excellent dispersibility and aggregation performance. Under conditions of 120 °C and a salinity of 30,000 mg/L, the particle size increased from 165 nm to 15.04 μm, corresponding to a 91.1-fold increase. Core flooding experiments showed a plugging rate of 75.3% and a residual resistance factor of 5.25 at a MCPs concentration of 1% with 1.0 PV injection. Nuclear magnetic resonance and high-pressure mercury intrusion tests indicated that the system primarily blocked pore and fracture channels ranging from 1 to 10 μm. A field test conducted in the Sulige gas field further validated the aggregation behavior and water control efficacy of the system in high-permeability channels, where the concentration in the flowback fluid decreased from 0.30 to 0.05% within 24 h, while the particle size increased to 11.97 μm. These results demonstrate that the MCPs system possesses effective water shutoff capability, making it well-suited for applications in high-temperature and high-salinity tight gas reservoirs.

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