Volume 35 Issue 5
Sep.  2018
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WU Jiang, LI Long, REN Guanlong, ZHANG Chong. Development and Application of A High Performance Oil Base Drilling Fluid for Drilling Complex Sloughing Formations in Offshore Operations[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 55-60. doi: 10.3969/j.issn.1001-5620.2018.05.011
Citation: WU Jiang, LI Long, REN Guanlong, ZHANG Chong. Development and Application of A High Performance Oil Base Drilling Fluid for Drilling Complex Sloughing Formations in Offshore Operations[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 55-60. doi: 10.3969/j.issn.1001-5620.2018.05.011
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Development and Application of A High Performance Oil Base Drilling Fluid for Drilling Complex Sloughing Formations in Offshore Operations

doi: 10.3969/j.issn.1001-5620.2018.05.011

  • CNOOC Zhanjiang Branch Company, Zhanjiang, Guangdong 524057

  • Received Date: 2018-06-29
  • Publish Date: 2018-09-30
    Abstract
  • Wellbore instability has been a risk encountered in drilling the Weizhou formation in Weixinan oilfeld, Beibu Gulf Basin, west of South China Sea, because of the effects of tectonic stresses and the hard and brittle shales existed in the formation. Diffculties in pulling out of hole, wellbore instability and poor well cementing quality are problems found in using conventional oil base drilling fluids. A new high-performance oil base drilling fluid, with oil/water ratio of 95:5, has been developed based on the analyses of the application of conventional oil base drilling fluids and through optimization of emulsifer, plugging agent and gelling agent. This new oil base drilling fluid had the good borehole wall stabilizing capacity, good plugging capacity, excellent ECD control ability, and tolerance to contamination of 15% low quality clay. Percent recovery of permeability of cores contaminated by this new oil base drilling fluid was more than 90%, with flowback pressure of only 0.4 MPa, indicating that the oil base drilling fluid had good reservoir protection capacity. Field application of the oil base drilling fluid showed that when drilling the Member Ⅱ of the Weizhou formation, the drilling fluid had stable rheology, good plugging capacity and good hole cleaning performance, no mud losses happened during drilling. It only spent 8.09 d to drill 2,500 m of the well, 48% less than the drilling time spent previously drilling other development wells nearby. Reservoir was also well protected. The success of the drilling operations with the new oil base drilling fluid provides a good clue for oilfeld development in areas similar to Beibu Gulf Basin.

     

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