深层页岩气井用新型抗高温自愈合可降解堵漏剂的研制与表征OA北大核心

Objective To address the shortcomings faced by conventional plugging materials in the plugging process of deep shale gas well.Method A new type of plugging agent with self-healing and degradable functions was prepared by crosslinking epoxy resin,succinic anhydride,acetylacetone zinc hydrate,and polyethylene glycol(PEG)using a high-temperature curing method.Result The plugging agent could withstand temperatures up to 180℃,and the mass loss rate after hot rolling at 180℃,16 h was less than 1.6%.Under the condition of 180℃,the stress relaxation time could be adjusted within 2 000-6 000 s.After doping with 25 wt%PEG,the plugging agent could achieve 100%complete healing effect within 25 min.Under a high-temperature alkaline environment,it could degrade rapidly.When the NaOH dosage was 1.5 wt%,the plugging agent could be completely degraded within 1 h.The pressure bearing capacity of plugging 5 mm×4 mm cracks at 180℃could reach 10.0 MPa.Conclusion The newly developed glass-like polymer plugging agent has good high-temperature resistance,temperature-sensitivity self-healing,and self-degradation properties,which can effectively solve the leakage problem of deep shale gas wells and meet their efficient exploration and development needs.