Abstract
In view of the shortcomings of conventional plugging materials in preventing leakage during drilling or workover of high-temperature gas wells, a novel type of plugging material with self-healing and degradable functions was prepared by using epoxy resin, succinic anhydride, acetylacetone zinc hydrate and polyethylene glycol as raw materials and adopting high-temperature curing method. The temperature resistance of the plugging material can reach 180 ℃, and the mass loss rate after 180 ℃/16 h hot rolling is less than 1.6 %. With the temperature of 180 ℃, the stress relaxation time can be adjusted within 2000–6000 s. After doping 25 % polyethylene glycol (PEG), the plugging material can achieve 100 % complete healing within 25 min. It has good mechanical strength and resilience. After the pressure extrusion of 10 MPa, the highest resilience rate can reach 56 %, and the crushing rate is less than 10 %. It can be degraded rapidly under high temperature and alkaline environment. When the NaOH dosage is 1.5 %, the plugging material can be completely degraded within 1 h. Under 180 ℃, the pressure bearing capacity of plugging 5 × 4 mm fracture can reach 10 MPa.
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