Study and Shutoff Experiment on Mechanical Properties of Multistage Resin Composite Ductile Cement

¹ Engineering Technology Research Institute, Huabei Oilfield Company, Renqiu 062552, China;
² Underground Gas Store Managent Agency, Huabei Oilfield Company, Langfang, Hebei, 065000, China
³ Erlian Branch, Huabei Oilfield Company, Xilinhot, Inner Mongolia, 026000, China

^* Corresponding author’s e-mail: cyy_liuss@petrochina.com.cn

Abstract

In view of the traditional inorganic cement-based material hydration shrinkage caused by the impact of performance defects range of application, applying the principle of doping dispersion and compact packing, a multistage resin composite ductile cement slurry system with different temperatures was constructed. The compatibility, thickening and mechanical evaluation tests were carried out to optimize the resin type, doping amount and method. The results show that the thickening of the composite system is controllable, and the addition of resin is beneficial to improve the elastic deformation, whereas easy to pile up if adding extra amounts, and the compressive strength reduced. At the same time, adding resin first is beneficial to disperse in the cement gap. Compared with cement-based materials, the compressive strength increased 7% to 13%, the elastic modulus decreased 10% to 15%, and the deformation capacity increased 14% to 22%. Field test shows that it has good sealing performance and remarkable effect of oil increasing and dewatering, which provides a new technical means for controlling casing leakage and ensuring its normal production.