Volume 39 Issue 2
Jun.  2022
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ZHAO Jiansheng, DAI Qing, HUO Jinhua, et al.Preparation and Application of Fluid Loss Additive GT-1 for High Temperature Cementing Slurry[J]. Drilling Fluid & Completion Fluid,2022, 39(2):234-240 doi: 10.12358/j.issn.1001-5620.2022.02.017
Citation: ZHAO Jiansheng, DAI Qing, HUO Jinhua, et al.Preparation and Application of Fluid Loss Additive GT-1 for High Temperature Cementing Slurry[J]. Drilling Fluid & Completion Fluid,2022, 39(2):234-240 doi: 10.12358/j.issn.1001-5620.2022.02.017

Preparation and Application of Fluid Loss Additive GT-1 for High Temperature Cementing Slurry

doi: 10.12358/j.issn.1001-5620.2022.02.017
  • Received Date: 2021-12-01
  • Rev Recd Date: 2022-01-16
  • Publish Date: 2022-06-23
  • In exploration of deep and ultra-deep buried oil and gas resources, well cementing operation has long imposed more rigorous requirements on cement slurries and additives. Filter loss reducers commonly used in cement slurries, for example, have some shortages such as poor high-temperature and salt resistance, narrow temperature range in which the filter loss reducers can work, as well ss poor compatibility with other additives. To solve these problems, a high temperature filter loss reducer GT-1 was developed based on the design of molecular structure and the selection of functional monomers, with raw materials such as 2-acrylamido-2-methylpropane sulfonic acid (AMPS), acrylamide (AM), sodium p-styrene sulfonate (SSS) and nano silica. Using IR, gel chromatography, simultaneous thermal analyzer and SEM, the filtration control, high temperature resistance and salt resistance of GT-1, as well as GT-1’s effect on the rheology of cement slurry, the compressive strength of set cement and consistency of cement slurry were studied. The study showed that the chemical structure of GT-1 meets the requirements previously planned. The weight average molecular weight of GT-1 is 138,431, and GT-1 has excellent thermal stability. A regular spatial network structure can be measured in GT-1’s water solution. Good high temperature and salt resistance of GT-1 makes it suitable for controlling the filtration rate of cement slurry. Cement slurries formulated with GT-1 have good engineering performance which satisfies the needs of well cementing.

     

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