Volume 39 Issue 5
Jan.  2023
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CHEN Rongyao, SONG Jianjian, WU Zhongtao, et al.High temperature high density cement slurry with corrosion inhibition property[J]. Drilling Fluid & Completion Fluid，2022, 39（5）：601-607 doi: 10.12358/j.issn.1001-5620.2022.05.011
Citation: CHEN Rongyao, SONG Jianjian, WU Zhongtao, et al.High temperature high density cement slurry with corrosion inhibition property[J]. Drilling Fluid & Completion Fluid，2022, 39（5）：601-607 doi: 10.12358/j.issn.1001-5620.2022.05.011
shu

High Temperature High Density Cement Slurry with Corrosion Inhibition Property

doi: 10.12358/j.issn.1001-5620.2022.05.011
  • 1.

    School of Petroleum Engineering, Yangtze University, Wuhan，Hubei 430100

  • 2.

    Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Wuhan，Hubei 430100

  • 3.

    Collaborative Innovation Center Jointly Built by the Ministry of Unconventional Oil and Gas, Wuhan，Hubei 430100

  • 4.

    CNOOC Oilfield Services Co., Ltd., Langfang , Hebei 065200

  • Received Date: 2022-05-19
  • Rev Recd Date: 2022-06-30
  • Publish Date: 2023-01-10
    Abstract
  • CO2 gas in the deeper part of a high temperature high pressure well generally causes corrosion to the set cement and damages the sealing integrity of the cement sheath. To develop a high temperature high density cement slurry with high corrosion inhibitive capacity, studies were conducted on the key cement materials, and a high temperature high density cement slurry with high corrosion inhibitive capacity was formulated. Analyses of the performance and micro morphology of the cement slurry show that manganese ore powder weighting material can remarkably increase the density of a cement slurry, and the cement slurry also has good corrosion inhibition property at high temperature. In formulating the cement slurry, a filter loss reducer JS18L was used to control high temperature filtration rate, and a cement retarder H16L was used to control thickening time. The corrosion inhibitive capacity of the cement slurry was improved with the use of an inorganic corrosion inhibitor NAM-H and an organic corrosion inhibitor SZ-M2. Using these materials, a high temperature high density (1.90-2.20 g/cm3) cement slurry was formulated. The new cement slurry has good rheology, good stability, low filter loss of less than 50 mL and thickening time adjustable between 3 h and 5 h. The high density set cement at high temperatures has stable mechanical properties and good corrosion inhibitive capacity. The deterioration rate of the 30 d compressive strength of the set cement is less than 25%, and the depth of corrosion is less than 1.5 mm. The results of the study provide technical support to the cementing of high temperature high pressure wells with acid gases and CO2 geological sequestration wells.

     

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