Volume 33 Issue 5
Sep.  2016
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YANG Peilong, XU Mingbiao, WANG Lei, CHENG Shuang, WANG Xiaoliang. Oversaturated Potassium Chloride Cement Slurry for Cementing Boreholes Penetrating Thick Salt and Gypsum Formations[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(5): 80-83. doi: 10.3969/j.issn.1001-5620.2016.05.017
Citation: YANG Peilong, XU Mingbiao, WANG Lei, CHENG Shuang, WANG Xiaoliang. Oversaturated Potassium Chloride Cement Slurry for Cementing Boreholes Penetrating Thick Salt and Gypsum Formations[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(5): 80-83. doi: 10.3969/j.issn.1001-5620.2016.05.017

Oversaturated Potassium Chloride Cement Slurry for Cementing Boreholes Penetrating Thick Salt and Gypsum Formations

doi: 10.3969/j.issn.1001-5620.2016.05.017
  • Received Date: 2016-07-15
  • Publish Date: 2016-09-30
  • To improve the job quality of cementing the borehole penetrating thick salt and gypsum formations, an over-saturated potassium chloride solution (contains 38% KCl) was used in formulating a cement slurry, in an effort to avoid rock salt dissolution during well cementing. The over-saturated KCl cement slurry formulated was treated with a salt-resistant filter loss reducer CG80S, an enhanced anti-channeling agent GS12L, and a non-penetrating agent BX-80. Laboratory evaluation showed that the over-saturated KCl cement slurry had controllable thickening time and filter loss. The compressive strength of the set cement, after aging for 24 h at 68℃, was greater than 15 MPa. When contaminated by 5% gypsum, Glauber's salt or shale cuttings, the properties of the cement slurry did not change noticeably. Laboratory experiments also showed that the bond of the cement slurry and the salt formations improved remarkably, indicating that the quality of the bond between the cement sheath and the casing string, and the bond between the cement sheath and the formations can both be guaranteed.

     

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