Abstract:
The large-scale application of effective proppant fracturing technology, characterized by large fluid volume, large displacement, and large sand volume in coalbed methane (CBM) wells of the South Yanchuan Block has significantly shortened the gas production cycle and enhanced economic efficiency. However, it also induced severe formation sand production and frequent pump inspections. To overcome these challenges, a low-temperature consolidation sand (HDCS-L) was developed using quartz sand, epoxy resin, modified aliphatic amines, polyethylene glycol, and other raw materials through surface modification and physical coating methods. Key properties, including consolidation time, consolidation temperature, consolidation strength, and flow conductivity, were systematically evaluated. The evaluation results demonstrate that HDCS-L achieves a consolidation strength of 5.69 MPa after standing 24 hours at 30 °C under atmospheric pressure, and the consolidation strength increases to 12.17 MPa after standing 24 hours at 30 °C under 10 MPa, with a flow conductivity of 8.82 mD·cm, confirming its robust consolidation strength and flow conductivity after low-temperature consolidation. Field application in seven wells demonstrates a 100% success and efficiency rate. Well Y-11 has maintained effectiveness for over 240 days, and Well Y-21 has achieved stable production for more than 180 days. This study validates that HDCS-L is suitable for the integrated fracturing and drainage process in CBM wells of the South Yanchuan Block, demonstrating promising application potential.