Joint Stock Company
Institute for Design and Research in Oil Industry

Producing Multihole Well Construction

In 2015, Giprovostokneft Institute developed a unique for Rusvietpetro fields project for producing multihole well № 44109 on cluster pad № 1 of North-Oshkotynskoye field, Central Khoreyverskoye Upheaval, block № 4

Конструкция скважины

The choice in favor of North – Oshkotynskoye field for drilling of pilot multihole well №44109 was determined by high oil flowrates on neighboring drilled wells: 116 to -257 t/day with low water cut and by the fact that geological structure of chosen drilling area had been sufficiently investigated. This well will possibly let enhance flowrate even more and save funds for well site construction.

Well structure was developed in full accordance with up-to-date safety requirements when constructing hazardous industrial facilities (drill wells):

  • Guide diameter 426 mm-0-30 m-cement to wellhead.
  • Surface casing diameter 324 mm-0-350 m- cement to wellhead.
  • Intermediate string diameter 245 mm-0-2470 m- cement to wellhead.
  • Production string diameter 178 mm-0-3115/3314 m – cement in interval
    2170 - 3115/3314 m.
  • Liner diameter 127 mm-3090/3239-3137/3819 m – no cementing.
  • Lateral hole diameter 123,8 mm-3130/3411-3137/3684 m – no lining (open hole).

    Hole diameter 219 мм

    • Straight hole 0-2543 m
    • Inclination angle build section 74,370 2543 -3115/3314 m = 572/771 m, with recoil 434 to formation top D3fmIII (Point Т1 formation top D3fmIII3115/3314 m)

    Main hole diameter 155,6 mm

    • Inclination angle build section 89,980 3115/3314 -3137/3476 m = 22/162 m, recoil 594 m (Point Т2 driller’s target 3137/3476)
    • Horizontal wellbore main hole 89,990 3137/3476 - 3137/3819 = 0/343 with reach 819 m (Point Т3 total depth 3137/3704 m)
    • Horizontal length 343 m in interval 3137/3476 - 3137/3819 м from point Т2 to point Т3

    Lateral hole diameter 123,8 mm

    • Kick-off Т2I (formation D3fmIII) =3130/3410 m = 870 (recoil 529 m)
    • Lateral hole kick-off point Т3I (formation D3fmIII) =3137/3684 m
    • Lateral hole section 3130/3410-3137/3684 m = 3/274 m, 870 (recoil 684 m)
    • Lateral hole total reach = 684 m.
    • Horizontal hole length 274 m in interval 3130/3410 - 3137/3684 m from point Т2I to point Т3
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