Novel smart plugging material for high-temperature gas well

A novel smart material is developed, which is synthesized by succinic anhydride, epoxy resin, and zinc acetylacetone hydrate. The smart material has excellent properties of self-healing, shape memory, and degradation. The experimental results of performance characterization show that the material has good thermal stability. The glass transition temperature is adjustable between 100 and 120[degrees]C, and the storage modulus can reach 20 GPa. The maximum thermal expansion at 50[degrees]C is less than 15%, the thermal expansion equilibrium time at 120[degrees]C is less than 5 min, and the maximum thermal expansion is 131%. The stress relaxation time at 120[degrees]C is more than 2 h, which can slowly self-heal on the basis of maintaining the mechanical strength. When the NaOH content is 1.5%, the degradation equilibrium can be reached in about 3 h, and the maximum degradation rate is 86%. The comprehensive performance evaluation shows that after hot rolling at 120[degrees]C/16 h, the material has no effect on the rheology and filtration properties. When plugging the fracture width of 5 * 4 mm, the pressure bearing capacity reaches 10 MPa. Its main mechanism is temperature-sensitive expansion, and the stress relaxation effect heals and blocks the micro pore throat. KEYWORDS degradable, high temperature, seal-healing, shape memory
1 | INTRODUCTION Natural gas energy, as a clean energy with huge reserves, wide distribution, and green, has broad application prospects. However, it often faces with complex situations such as [...]