Volume 40 Issue 3
May  2023
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REN Qiang, LIU Ningze, LUO Wenli, et al.Study on a foam lightweight cement slurry and the distribution of its micro pores[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：376-383 doi: 10.12358/j.issn.1001-5620.2023.03.014
Citation: REN Qiang, LIU Ningze, LUO Wenli, et al.Study on a foam lightweight cement slurry and the distribution of its micro pores[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：376-383 doi: 10.12358/j.issn.1001-5620.2023.03.014
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Study on a Foam Lightweight Cement Slurry and the Distribution of Its Micro Pores

doi: 10.12358/j.issn.1001-5620.2023.03.014
  • 1.

    Engineering Technology Research Institute, BHDC, Tianjin 300451

  • 2.

    No. 1 Cementing Company，BHDC, Renqiu, Hebei 062552

  • 3.

    Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500

  • Received Date: 2022-12-17
  • Rev Recd Date: 2023-02-06
    • Available Online: 2023-07-21
  • Publish Date: 2023-05-30
    Abstract
  • Foam lightweight cement slurry is very important to the safety of downhole operation in low-pressure easy-to-leak formation drilling. A high temperature high efficiency foaming agent FPJ-S has been developed to formulate lightweight cement slurries. FPJ-S is prepared from the hydrophilic tetradecanedioic acid methyl ester, the hydrophobic N,N-dimethyl-1,3-diamino propane and a rigid linking monomer 2,2’-dibromobiphenyl. A high temperature foam stabilizer, WPJ-S, was developed with the FPJ-S, a viscosifying foam stabilizer and a synergistic foam stabilizer. A foam lightweight cement slurry was formulated with WPJ-S and experiments were conducted to study the foaming capacity of the FPJ-S and the WPJ-S, as well as the distribution of pores in the set foam cement. The study results show that compared with conventional foaming agents, the foaming capacity of the FPJ-S is increased by 40%, the 1-hour settling distance is reduced by 58.8%. The foam stabilizing capacity and temperature tolerance of the WPJ-S is superior to the conventional foam stabilizers. The density of the foam lightweight cement slurry formulated can be adjusted between 0.90 g/cm3 and 1.6 g/cm3. The cement slurry has good settlement stabilization, and the 24-hour compressive strengths of the cement slurries of different densities are all greater than 3 MPa. Technical characterization based on mercury intrusion method and industry CT (XCT) shows that the foam lightweight cement slurry has pores that are uniformly distributed inside the set cement, and the set cement has regular morphology, and no large number of connecting holes are found in the set cement.

     

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