Volume 40 Issue 1
Jan.  2023
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XING Xijin, XIE Renjun, QIU Zhengsong, et al.A study on borehole wall strengthening technique and its application in block ledong[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：67-72 doi: 10.12358/j.issn.1001-5620.2023.01.009
Citation: XING Xijin, XIE Renjun, QIU Zhengsong, et al.A study on borehole wall strengthening technique and its application in block ledong[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：67-72 doi: 10.12358/j.issn.1001-5620.2023.01.009
shu

A Study on Borehole Wall Strengthening Technique and Its Application in Block Ledong

doi: 10.12358/j.issn.1001-5620.2023.01.009
  • 1.

    CNOOC research institute co. LTD, Beijing 100028

  • 2.

    China University of Petroleum (East China), Qingdao，Shandong 266580

  • Received Date: 2022-10-06
  • Rev Recd Date: 2022-11-02
  • Publish Date: 2023-01-31
    Abstract
  • The Ledong block, a typical high temperature high pressure offshore block, is located in the depression slope zone of the Yinggehai Basin. Some formations drilled in this block have narrow safe drilling windows and mud losses in deep hole occurred frequently during drilling. To deal with the mud losses, the drilling data was studied and the mechanisms and nature of the mud losses were analyzed. Using the viscous element method, the change of the stresses around the borehole before and after borehole wall strengthening was simulated, and the opening of the prefilled fractures predicted. Using a new experiment apparatus which can simulate the plugging of variable fractures, a study was conducted on the particle size distribution and concentration optimization for borehole wall strengthening. The experimental results show that the D50 criterion is a better particle size matching criterion, and a reasonable concentration of the particles is 5%. A drilling fluid that is suitable for use in the Ledong block and has the ability of borehole wall strengthening is developed through optimization experiment. In a comprehensive evaluation experiment, the additives for borehole wall strengthening showed little effects on the rheology of the drilling fluid. Sand bed test showed that the depth of the filtrate invasion was only 1.5 cm. Dynamic pressure bearing capacity of 1mm fractures tested with the drilling fluid can be as high as 12 MPa.

     

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