Volume 40 Issue 6
Dec.  2023
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WU Xiaohong, CHEN Jinxia, WANG Xianbo, et al.Drilling Fluid Technology for Stabilizing the Borehole Penetrating the Shasanyi Sub-member in Block NP-280 in Jidong Oilfield[J]. Drilling Fluid & Completion Fluid,2023, 40(6):725-732 doi: 10.12358/j.issn.1001-5620.2023.06.005
Citation: WU Xiaohong, CHEN Jinxia, WANG Xianbo, et al.Drilling Fluid Technology for Stabilizing the Borehole Penetrating the Shasanyi Sub-member in Block NP-280 in Jidong Oilfield[J]. Drilling Fluid & Completion Fluid,2023, 40(6):725-732 doi: 10.12358/j.issn.1001-5620.2023.06.005

Drilling Fluid Technology for Stabilizing the Borehole Penetrating the Shasanyi Sub-member in Block NP-280 in Jidong Oilfield

doi: 10.12358/j.issn.1001-5620.2023.06.005
  • Received Date: 2023-05-20
  • Accepted Date: 2023-06-20
  • Rev Recd Date: 2023-06-05
  • Publish Date: 2023-12-30
  • Borehole wall collapse has been encountered when drilling the Shasanyi sub-member in many wells in the NP-280 block in Jidong Oilfield. Study has shown that the shales in the block are easy to hydrate when in contact with water. Microfractures with medium and high angles are developed in the thief zones. These microfractures, with original widths of 0.1 μm – 100 μm, become widened under pressure and hence further become fractures through which drilling fluids are lost. This in turn induces large-scale sloughing of the borehole walls and borehole collapse has thus occurred. In this paper, the studies on the mechanisms of borehole wall stabilization in the broken formations in the NP-280 block and the methods of borehole wall instability evaluation are described. Using the high temperature inhibitive drilling fluid, which was used to drill the third interval of the wells, a new inhibitive drilling fluid with high plugging capacity is developed thorough laboratory optimization. This drilling fluid is suitable for drilling formations with induced microfractures. Field application shows that it can be used to effectively prevent the borehole wall collapse problems encountered in drilling the Shasanyi sub-member, and this technology is worth applying in future drilling operation in this area.

     

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