Volume 40 Issue 5
Dec.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(5): 556-562
GAO Shuyang, TANG Zhichuan, SONG Bitao, et al.Drilling fluid technology for plugging and strengthening the borehole wall of wells penetrating the faulted fractured reservoirs in west Sichuan[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：556-562 doi: 10.12358/j.issn.1001-5620.2023.05.002
Citation: GAO Shuyang, TANG Zhichuan, SONG Bitao, et al.Drilling fluid technology for plugging and strengthening the borehole wall of wells penetrating the faulted fractured reservoirs in west Sichuan[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：556-562 doi: 10.12358/j.issn.1001-5620.2023.05.002
shu

Drilling Fluid Technology for Plugging and Strengthening the Borehole Wall of Wells Penetrating the Faulted Fractured Reservoirs in West Sichuan

doi: 10.12358/j.issn.1001-5620.2023.05.002
  • 1.

    Shale Oil and Gas Enrichment Mechanism and Effective Development State Key Laboratory, Beijing 102206

  • 2.

    Sinopec Research Institute of Petroleum Engineering Technology Co., Ltd., Beijing 102206

  • 3.

    Sinopec Southwest Petroleum Engineering Co., Ltd., Deyang, Sichuan 618000

  • Received Date: 2023-03-16
  • Rev Recd Date: 2023-04-23
  • Publish Date: 2023-12-25
    Abstract
  • Drilling the broken formations in the faulted fractured reservoirs in west Sichuan has been encountered with frequent drill pipe sticking and a well is very difficult to be drilled in accordance with the designed parameters. Geological characteristics analyses and laboratory evaluation results have shown that the rocks in the faulted fractured broken formations are weakly bonded and are developed with microfractures. When a liquid invades into the microfractures, the microfractures extend and the integrity and mechanical property of the rocks are damaged, which in turn changes the status of the effective stresses of the rocks around the borehole and results in borehole collapse. Based on this conclusion, a high temperature chemical borehole wall strengthening agent was developed and a high efficiency plugging agent selected to formulate a drilling fluid with the capacity of plugging and strengthening the borehole walls in the faulted and fractured formations. This drilling fluid, with an enhanced plugging and strengthening capacity, has been successfully used in drilling several wells, including the well M6, and the walls of the borehole penetrating the broken faulted fractured formations were maintained stable during drilling. This drilling fluid will have a good application prospect.

     

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