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Dinislam R. Isangulov
Dinislam R. Isangulov
Engineer First Division
LLO “Perfobore”
Engineer First Division
LLO “Perfobore”
Moscow
Russia

Articles

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2022-08-10
  • Date accepted
    2023-02-28
  • Online publication date
    2023-04-28
  • Date published
    2024-02-29

Selection of the required number of circulating subs in a special assembly and investigation of their performance during drilling of radial branching channels by sectional positive displacement motors

Article preview

The task of sludge removal to the surface during construction of directional and horizontal wells and strongly curved radial channels is relevant. For stable operation of technical system “Perfobore”, it is proposed to use a circulating sub that ensures efficient cleaning of channel wellbore from the drilled rock. Two schemes of technical system “Perfobore” are considered, consisting of two seven-meter coiled tubing, a positive displacement motor, a bit and one circulating sub in the first scheme and two subs in the second scheme. For each of the schemes CFD modeling was implemented to determine values of pressure and speed. It was found out that the use of two circulating subs in the assembly is more efficient. In order to confirm the numerical experiment, bench tests were carried out. It was determined that the designed circulating sub can eject up to 25 % of pumped drilling fluid. The bench tests of full-size technical system “Perfobore” for drilling 14-meter channels with two circulating subs showed that the axial load on positive displacement motor produced by hydraulic loader was 3000 N and pressure drop depending on flow rate was 1.5-2.0 MPa. This allows the motor to operate at maximum power.

How to cite: Lyagov I.А., Lyagov A.V., Isangulov D.R., Lyagova А.А. Selection of the required number of circulating subs in a special assembly and investigation of their performance during drilling of radial branching channels by sectional positive displacement motors // Journal of Mining Institute. 2024. Vol. 265. p. 78-86. EDN ZBPWKU