Volume 39 Issue 1
May  2022
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FAN Baitao, WU Zhiqiang, ZHANG Dangsheng.Development of strength of set aluminate cement in liquid and gaseous CO2 environment[J]. Drilling Fluid & Completion Fluid,2022, 39(1):59-64 doi: 10.12358/j.issn.1001-5620.2022.01.010
Citation: FAN Baitao, WU Zhiqiang, ZHANG Dangsheng.Development of strength of set aluminate cement in liquid and gaseous CO2 environment[J]. Drilling Fluid & Completion Fluid,2022, 39(1):59-64 doi: 10.12358/j.issn.1001-5620.2022.01.010

Development of Strength of Set Aluminate Cement in Liquid and Gaseous CO2 Environment

doi: 10.12358/j.issn.1001-5620.2022.01.010
  • Received Date: 2021-10-22
  • Accepted Date: 2021-10-22
  • Rev Recd Date: 2021-11-28
  • Publish Date: 2022-05-06
  • In in-situ combustion operation, the set cement has to experience temperatures up to 500 ℃, under which the silicate cement is unable to retain its stability, and large amount of corrosive gas will be produced in the wellbore. To deal with these problems, the calcium aluminate cement (CAC) modified with slag was chosen to study its mechanical feasibility in cementing high temperature wells. The strength development pattern of the slag CAC was studied in a simulated real in-situ combustion work condition. The material composition and micromorphology of the slag CAC before and after corrosion were tested using X-ray and SEM, and the strength development of the slag CAC under simulated in-situ combustion work condition was investigated. It was found that with the increase in the amount of slag in the CAC, the compressive strength of the set cement first increased and then decreased, a top value was obtained at slag concentration of 30% in the cement. At elevated temperatures, the slag CAC can still retain higher compressive strength, and after secondary curing at high temperature, the strength of the set slag CAC was further developing, indicating that the slag cement has good high temperature resistance. In 50 ℃ liquid environment, corrosion of the set cement produced calcium carbonate and in the set cement there were pores and micro fractures because of the corrosion, all these damaged the integrity of the set cement and caused the strength of the set cement to reduce. In high temperature gaseous environment, CO2 did not cause corrosion damage to the set cement. This study has provided a theoretical base for optimizing the mechanical performance and improving the CO2 corrosion resistance of the set CAC under in-situ combustion work condition.

     

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