Volume 40 Issue 2
Mar.  2023
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WANG Xin, TAN Chun, WANG Zhibin, et al.Ultra-high density drilling fluid technology for the well Hetan-1[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：193-201 doi: 10.12358/j.issn.1001-5620.2023.02.007
Citation: WANG Xin, TAN Chun, WANG Zhibin, et al.Ultra-high density drilling fluid technology for the well Hetan-1[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：193-201 doi: 10.12358/j.issn.1001-5620.2023.02.007
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Ultra-High Density Drilling Fluid Technology for the Well Hetan-1

doi: 10.12358/j.issn.1001-5620.2023.02.007
  • 1.

    Drilling Fluid Technology Services of CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280

  • 2.

    Bayan Petroleum Engineering Branch of CNPC Bohai Drilling Engineering Company Limited, Bayannur, Inner Mongolia 015000

  • 3.

    Exploration Department of CNPC Huabei Oilfield, Renqiu, Hebei 062552

  • 4.

    Drilling directional Well Technology Services of CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280

  • 5.

    Engineering Technology Research Institute of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062550

  • Received Date: 2022-11-28
  • Rev Recd Date: 2022-12-30
  • Publish Date: 2023-03-30
    Abstract
  • The well Hetan-1 is a key exploratory well drilled by CNPC at the Linhe depression in the Hetao basin in Huabei oilfield. The completion depth of this well is 6,460.44 m and was drilled to explore the reservoir characteristics of the Paleogene and the Neogene systems in the Guangming anticline in the Xinglong tectonic belt. The third interval of this well penetrated formations of four different formation pressure coefficients, and the safe drilling windows of the formations are narrow. Killing the well by raising mud weight, controlling mud losses and drilling with managed pressure were used in drilling this interval. When drilling into the formation with ultra-high pressure fluids, the mud density was increased in one step from 1.80 g/cm3 to 2.55 g/cm3, and the well was successfully completed. The kill mud stored at the rig site had a density of 2.60 g/cm3, a density limit of water based drilling fluids weighted with barite. Several downhole troubles were encountered during drilling, such as borehole collapse, pipe sticking because of creeping tight hole in mudstone formations containing gypsum, high pressure saltwater invasion as well as mud losses. The interval was drilled with a high temperature ultra-high density compound saltwater drilling fluid, and controlling mud losses while drilling technique was used seven times to enhance the pressure bearing capacity of the formations. During drilling, finer screens were used on shale shakers for better solids control, the drilling fluid was continually optimized for its composition, the weighting materials were carefully selected, the content of bentonite in the mud was adjusted to satisfy the needs of stabilizing mud rheology, and the content of the low-gravity solids in the mud was carefully controlled at as low as possible level. With these measures, problems such as narrow drilling windows, difficulties in controlling the rheology of a high temperature high solids content drilling fluid with ultra-high density were successfully solved, ensuring the stability of the properties of the ultra-high density drilling fluid in high temperature drilling and completion operations. The drilling of this well has created six drilling technical indicators in this area at the same period. An industrial oil flow of 302.4 m3 was produced daily, realizing the target of exploring oil and gas in the deepest well in the Bayan oilfield, and of providing technical support to the drilling and completion operations.

     

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