Volume 38 Issue 6
Nov.  2021
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ZOU Shuang, XIONG Yudan, ZHANG Tianyi, et al.Study and application of fluid loss additive used in cement slurries for cementing salt-gypsum stratum[J]. Drilling Fluid & Completion Fluid,2021, 38(6):765-770 doi: 10.12358/j.issn.1001-5620.2021.06.017
Citation: ZOU Shuang, XIONG Yudan, ZHANG Tianyi, et al.Study and application of fluid loss additive used in cement slurries for cementing salt-gypsum stratum[J]. Drilling Fluid & Completion Fluid,2021, 38(6):765-770 doi: 10.12358/j.issn.1001-5620.2021.06.017

Study and Application of Fluid Loss Additive Used in Cement Slurries for Cementing Salt-Gypsum Stratum

doi: 10.12358/j.issn.1001-5620.2021.06.017
  • Received Date: 2021-06-04
  • Publish Date: 2021-11-30
  • High pressure natural gas well cementing in the piedmont structure in Kuche, Tarim Basin has encountered problems such as coexistence of well kick and mud losses in the salt-gypsum stratum, and narrow safe drilling windows etc. To deal with these problems, some functional monomers were selected and used to produce a fluid loss additive FL-A with high temperature tolerance, salt resistance and good dispersibility. IR analysis showed that the monomers all took part in the polymerization reaction. Thermogravimetric analysis showed that FL-A has good thermal stability; it functions normally at 300 ℃. In laboratory evaluation, cement slurries treated with FL-A has good filtration control capacity, and can be used in salt-saturated cement slurries. FL-A has good compatibility with other additives and normal thickening curve. Several cement slurries, with their densities between 2.3 g/cm3 and 2.6 g/cm3, were formulated with saturated saltwater and treated with FL-A. These cement slurries have low liquid/solid ratios, low filtration rate, good settling stability, excellent rheology and fast-developing strengths. They have been used more than 10 times in cementing wells penetrating salt-gypsum stratum, the job quality was satisfactory and the high pressure formation saltwater was effectively isolated.

     

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