Preparation and Performance of a Temperature-sensitive Polymer Composite Gel Temporary Plugging Agent
ZHANG Dingjun*, ZHANG Shengxiang, BAO Liangjun, WEI Fang, LI Wenjie
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: Temporary plugging agent with special water shutoff properties, based on P(AA-AM)/MMT polymer composite gel, was prepared via the traditional solution polymerization by using acrylamide and acrylic acid as comonomer, which can be used as the matrix material for water plugging agent. Using the second reaction modification platform of polydopamine (PDA), the hydrophobic paraffin wax (C25H52) was assembled on the surface of polyacrylamide based composite gel temporary plugging agent by self-assembly technology. A multi-stage structure P(AA-AM)/MMT@C25H52 with low temperature hydrophobicity and high temperature dissolution surface was successfully prepared. Under the laboratory environment of reservoir formation simulation, the relationship between water absorption rate of polymer composite gel temporary plugging agent and different influencing factors (time, temperature and salinity) was analyzed. The change of viscosity and aging time of polymer composite gel temporary plugging agent with the content of functional material of coating was investigated. The results show that the neutralization degree of acrylic acid is 80%, the water absorption performance of polymer gel is the best. With the content of paraffin wax 4wt%, the swelling property of the gel is relatively weak at low temperature, and the water absorption rate of the polymer composite gel temporary plugging agent reaches the optimal value at 60 ℃. The emulsified paraffin layer on the surface can delay imbibition and improve the transport capacity of temporary plugging agent.
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2022, Vol. 36 
