Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2021, Vol. 43 ›› Issue (3): 128-135.DOI: 10.11885/j.issn.16745086.2020.02.26.02

• OIL AND GAS ENGINEERING • Previous Articles     Next Articles

Research and Performance Evaluation of Cementing Anti-channeling Toughening Agent Under Dynamic Pressure

XU Bihua1, TANG Lei1, XU Kun2, XU Deyang2, LI Zhiheng2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. CNOOC China Limited, Tianjin Branch, Binhai New Aera, Tianjin 300450, China
  • Received:2020-02-26 Published:2021-06-22

Abstract: During the cementing process of adjustment well, the formation pressure is always in a state of fluctuation, which leads to serious water channeling; in addition, when the reservoir is reformed, the fracture of cement sheath will result in annulus channeling. In view of the above problems existing in the cementing of adjustment wells, a kind of anti channeling and toughening agent for cementing under dynamic pressure was prepared by optimizing the anti channeling and toughening materials. Then, according to the characteristics of water channeling under dynamic pressure, a new self-developed water channeling evaluation device is used to evaluate the water channeling performance of the modified cement slurry. In addition, the expansion property, mechanical property and engineering performance of the modified cement paste were evaluated. Finally, the field test was carried out in Bohai Oilfield. The results show that the agent enhances the anti dynamic water dispersion performance of cement slurry and the anti-water channeling performance of cemented interface of cement paste, reduces the water loss and volume shrinkage; at the same time, the agent significantly improves the toughness of cement paste, and has no negative impact on the engineering performance of cement slurry; the field test results show that the cementing quality is better than that of adjacent wells. The results show that the anti channeling and toughening agent can meet the requirements of cementing anti channeling and toughening under dynamic pressure.

Key words: adjustment well, dynamic pressure, cementing, anti-channeling, toughening

CLC Number: