Volume 39 Issue 3
May  2022
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ZHOU Xinyu, LIU Jingping, LYU Kaihe, et al.A high temperature gel plugging agent[J]. Drilling Fluid & Completion Fluid,2022, 39(3):294-300 doi: 10.12358/j.issn.1001-5620.2022.03.005
Citation: ZHOU Xinyu, LIU Jingping, LYU Kaihe, et al.A high temperature gel plugging agent[J]. Drilling Fluid & Completion Fluid,2022, 39(3):294-300 doi: 10.12358/j.issn.1001-5620.2022.03.005

A High Temperature Gel Plugging Agent

doi: 10.12358/j.issn.1001-5620.2022.03.005
  • Received Date: 2021-12-23
  • Rev Recd Date: 2022-01-28
  • Available Online: 2022-08-10
  • Publish Date: 2022-05-30
  • Gel plugging agents have the characteristics of strong self-adaptation, their use in drilling fluids, on the other hand, has the shortage of poor thermal stability. To overcome this shortage, a new gel plugging agent, PPAA, was developed with poly vinyl alcohol (PVA), acrylic acid (AA) and acrylamide (AM) as the reaction monomers, N, N-dimethyl bisacrylamide (MBA) as the crosslinking agent and ammonium persulphate as the initiator. PPAA functions normally at temperatures as high as 180 ℃. PPAA has low expansion factor, minor effect on the rheology of mud, and is able to control the filtration rate of the mud. A drilling fluid containing 2% PPAA, after aging at 180 ℃, can invade into a 80 – 100 mesh sand-bed by 2.6 cm, and the plugging efficiency of the mud is 60.6% higher than that of a mud treated with conventional plugging agents. Compared with conventional plugging agents, 6% NaCl solution treated with PPAA has efficiency of plugging increased by 48.6%, and the HTHP filter loss through sand plate reduced by 69.7%.

     

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