The customer of the services was DC Ukrnefteburenie PrJSC. Workover of the well No. 35 at the Sakhalinskoe field was completed in April 2020. As UNB reports, the workover was carried out without killing the well using the latest hydraulic snubbing unit by Denimex Workover Solutions LLC - RDE-340K 2019 year made with 180 ton lifting capacity.

Among the advantages of the unit is the ability to operate at the wellhead with a static pressure of over 350 atm. Jobs were carried out in the well to replace the tubing lift with gas-tight chrome pipes in order to extend the trouble-free operation of the well for at least 4 years.
Contractors were Denimex Workover Solutions LLC, Weatherford Ukraine LLC, Geo Well Services LLC.
Duration of jobs was 13.5 days. According to DC Ukrnefteburenie PrJSC, the initial daily flow rate after the workover amounted to 200 TCM of gas and 6.7 tons of condensate.

Reference

The advantages of a snabbing unit:

No need for well killing and killing solutions:

- no need for well killing, maintenance and use of additional materials and reagents to prepare well killing solutions and no risk of spillage;
- reducing the operating time when killing and developing wells.

Preservation of permeability of the opened productive horizons:

- no re-clogging of the bottomhole zone with fluid filtrate;
- no effect of hydrostatic and hydrodynamic pressures on productive horizons.

Saving time and costs:

- no losses in hydrocarbon production;
- no time losses for installation and dismantling of the unit when carrying out additional activities (well research, testing of new deposits);
- in relation to the technology of working with a flexible pipe, there is a possibility of rotation of the tubing string under pressure.

Environmental friendliness:

- minimal effect on the environment;
- no spills of solution, lubricants and other materials.