Research and Application of DAM Monomer Polymerization Plugging Agent for Hydraulic Fractures

10.6919/ICJE.202205_8(5).0037

Zilin Zhang

Ultra-low Permeability ； Hydraulic Fractures ； DAM Monomer Polymerization Plugging Agent ； Plugging ； Field Application

International Core Journal of Engineering

8卷5期（2022 / 05 / 01）

307 - 311

英文

This paper presents a DAM monomer polymerization plugging agent to solve the problem of channel flow along the hydraulic fractures in ultra-low permeability reservoir This plugging agent consists of DAM acrylamide monomer and additives including initiator, polymerizing agent, regulator and stabilizer. Its properties are evaluated based on the characteristics of ultra-low permeability reservoir and hydraulic fractures. Experimental results show that this agent exists as a Newtonian aqueous solution before gelling, with a low viscosity (below 3.1 mPa．s). After the polymerization in the formation, the agent forms polymeric gel with a strength over 2200 kPa and a long-lasting thermal stability. Physical plugging simulation of this agent for core samples shows using core samples shows a success rate over 99.5% and the threshold pressure reaches above 2.6 MPa. Hydraulic fractures plugging field tests using this agent has been conducted in Block E28 of Shengli Oilfield. The field results show that the tubing pressure in the injection well increased by 9.8 MPa after the plugging and cumulative oil production increased by 547.2 tons in the corresponding production well. This plugging agent is easy to prepare and field operations are easy to be implemented. It can give satisfying results in plugging hydraulic fractures and provides good technical supports for the development of low permeability reservoir.

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