Volume 38 Issue 2
Aug.  2021
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WANG Peiping. A Strongly Inhibitive Anti-Sloughing Water Base Drilling Fluid for Shale Reservoir Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 176-182. doi: 10.3969/j.issn.1001-5620.2021.02.008
Citation: WANG Peiping. A Strongly Inhibitive Anti-Sloughing Water Base Drilling Fluid for Shale Reservoir Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 176-182. doi: 10.3969/j.issn.1001-5620.2021.02.008

A Strongly Inhibitive Anti-Sloughing Water Base Drilling Fluid for Shale Reservoir Drilling

doi: 10.3969/j.issn.1001-5620.2021.02.008
  • Received Date: 2020-12-09
  • Drilling the long horizontal section of the shale gas well W-X1 in Weiyuan area has encountered downhole problems such as borehole wall instability, mud losses and high friction between the drilling string and the borehole wall. A water base drilling fluid with strong inhibitive capacity and anti-sloughing ability was developed to deal with these problems. The drilling fluid was formulated mainly with a poly amino shale inhibitor HCA-3, a compound plugging agent and a high efficiency lubricant RMLUB-1. Evaluation of the formulated drilling fluid showed that it has good rheology, low filtration rate and good lubricity, and is able to satisfy the basic needs of horizontal drilling of shale gas wells. Compared with other water base drilling fluids, this drilling fluid has better shale inhibitive capacity because it can reduce the Zeta-potential of shales to a much lower level. The PPA filtration rate and API filtration rate are all comparable to those of oil base muds, and this water base drilling fluid is able to prevent pressure transmission across the borehole wall and has high plugging capacity. Furthermore, this drilling fluid has good resistance to contamination; the properties of the drilling fluid do not change a lot when salts, drilled cuttings or bentonite clay is/are added. This drilling fluid has been successfully used in drilling the horizontal section (3rd interval) of the well W-X1 in Weiyuan area. During drilling operation, the properties of the drilling fluid were stable and the operation was done smoothly; no borehole wall instability, drag and resistance during tripping of drill string have ever been encountered, and drilling efficiency was enhanced.

     

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