Volume 42 Issue 4
Jul.  2025
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JIA Wenfeng, ZHANG Baichuan, LIU Hao, et al.Progresses in drilling fluid calcium resistant agent researches in China and abroad in recent ten years[J]. Drilling Fluid & Completion Fluid,2025, 42(4):453-461 doi: 10.12358/j.issn.1001-5620.2025.04.003
Citation: JIA Wenfeng, ZHANG Baichuan, LIU Hao, et al.Progresses in drilling fluid calcium resistant agent researches in China and abroad in recent ten years[J]. Drilling Fluid & Completion Fluid,2025, 42(4):453-461 doi: 10.12358/j.issn.1001-5620.2025.04.003

Progresses in Drilling Fluid Calcium Resistant Agent Researches in China and Abroad in Recent Ten Years

doi: 10.12358/j.issn.1001-5620.2025.04.003
  • Received Date: 2025-03-14
  • Rev Recd Date: 2025-04-03
  • Publish Date: 2025-07-31
  • Drilling fluid additives function less effectively or even lose their functions at high calcium content. To deal with this problem, many researchers, both in China and from abroad, tried to improve the calcium resistance of drilling fluids and have made some progresses. These researches were mainly focused on filter loss reducers, viscosifiers, shale inhibitors, lubricants as well as thinners. Products resistant to contamination by 25% calcium at 150℃ and resistant to contamination by 11% calcium at 180℃ have been developed. Part of these products have been successfully used in field operations, most of the additives are still in laboratory research though, and are still having difficulties in simultaneously possessing good calcium resistance and high temperature stability. Drilling fluid additives capable of resisting contamination by greater than 200,000 ppm calcium (≥ 20% calcium chloride) are rarely seen. In studying calcium resistant drilling fluid additives, focus should be placed on the prompt conversion of the laboratory research achievements, and cost-effective additives with both good calcium resistance and high temperature stability should be developed from low-cost and easily available biomass resources. In designing the molecular structures of polymer drilling fluid additives, special molecular structures instead of only the traditional ones, such as branched polymers, star polymers and dendrimers should be used. Attentions should be paid to the development of new monomers and the introduction of new materials. AI technology in material science can also be used to help further increase the high temperature stability and calcium resistance, enhance the development efficiency, and improve the compatibility of the drilling fluid additives.

     

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