NaftaGaz has built a high-precision horizontal well
In May 2020, NG-Drilling successfully completed the construction of the high-precision horizontal well at the Yuzhno-Priobskoye field. The Drilling Difficulty Index (DDI) amounted to 6.67 which is one of the highest figures for similar projects in the Western Siberia.
The well has a complicated structure: with the total depth of 5472 m, the length of the horizontal area is 2000 m. The casing shoe was installed at 2830 m and the length of the open borehole at drilling for the tailpipe amounted to 2642 m. Whereat, the well was drilled without any technical or geological complications.
Due to efficient collaboration between oil extraction and oil field service, a new technological design of the well was worked out. Its structure was made more appropriate for the conditions, metal consumption was reduced by reducing the diameter, also the transport section was removed and the ordinary drilling solution was replaced by the oil-based mud with special characteristics.
The production success was achieved using the upgraded well drill BU-3000 without using a rotary steerable system. A down-hole drilling motor was used during well construction. The second well is being built in the same way at the moment.
“Despite the fact that the global experience confirms the necessity of using the rotary steerable system for drilling wells of 2000 m, the selected design allowed us to use the down-hole drilling motor”, said Andrey Nakrainikov, Director for Drilling and Down Hole Treatment at Gazpromneft-Khantos LLC. “Generally, the developed technological solution will enable us to increase the efficiency in drilling of the wells with the horizontal borehole length of 2000 m by additional 5-8%.”
“The Company still has some opportunities for complicated wells”, said Islam Nazaraliev, CEO of NaftaGaz JSC, the Managing Company. “This well, multi-column wells, wells with controlled pressure are just a small example of what our team of professionals can do.”
As a reminder, the Company is in Top-5 of independent Russian drilling companies. The share of horizontal drilling in the NaftaGaz stock of orders amounts to 70% while the average market value is 40%.