基于疏水缔合作用的凝胶封堵剂及封堵机制研究OA北大核心

lost circulation has long been a major challenge affecting the safety and efficiency of drilling operations.In this study,a gel plugging agent(LAS)was synthesized via free radical polymerization using lauryl methacrylate(LMA)as the hydrophobic monomer and acrylamide(AM),2-acrylamido-2-methylpropanesulfonic acid(AMPS),and acrylic acid(AA)as hydrophilic monomers.The mechanical properties of the gel were enhanced by the coordination interaction between Al3+metal ions and carboxyl groups on the polymer molecular chains.The results demonstrated that the LAS gel exhibited re-crosslinkable characteristics,along with excellent plugging performance and self-adaptive properties under high-temperature and high-pressure conditions.Under conditions of 120℃and 6 MPa pressure,the leakage volumes of 2%LAS gel for simulated fracture sand beds with particle sizes of 20-40 mesh,40-60 mesh,and 60-80 mesh were 69.5 mL,58.3 mL,and 41 mL,respectively.This plugging performance significantly surpassed that of conventional gels and traditional plugging agents.Additionally,the LAS gel demonstrated superior swelling and rheological properties across varying temperatures and salinity levels.It could form a stable plugging layer under formation temperature activation,effectively reducing leakage volume.The dynamic re-crosslinking capability of the LAS gel ensured robust plugging effects even in extreme high-temperature and high-pressure environments,highlighting its potential for application in workflow leakage control.