Construction of crossings using trenchless technologies

The construction was carried out beyond the Arctic Circle in the permafrost zone, in a poorly developed area with a lack of permanent transport communications and communications.

The world's northernmost directional drilling crossing.
The company SP VIS-MOS" LLC has set a world record in construction by the method of directional drilling (HDD). In the Arctic, the construction of the northernmost not only in Russia, but also in the world, underwater crossing of the oil pipeline across the Messoyakha River on the Gydan Peninsula in the Yamalo-Nenets Autonomous Okrug was completed using horizontal directional drilling technology. "

The work was carried out in particularly unfavorable geological conditions, which make the work as difficult as possible due to the predominance of permafrost soils.

Work on the construction of crossings on the territory of the Severo-Russkoye field was carried out in the zone of permafrost soils of a heterogeneous structure, which required the use of modern navigation equipment, which makes it possible to maintain the well drilling trajectory with maximum accuracy. And the crossing over the Taz River with a diameter of 1220 mm and a length of 2048 m is an unprecedented success object made with such characteristics.The weight of the pipeline structure at the time of pulling through was 2633 tons.

SP VIS-MOS LLC completed a set of works on the arrangement of underwater crossings across the Zhuravka and Beisug rivers at the facility "Expansion of the UGSS to ensure gas supply to the South Stream gas pipeline. Stage 2 (eastern corridor), to ensure gas supply in the volume up to 63 billion m3/year". South European gas pipeline. Pochinki - Anapa section, km 1379-km 1570.5.2"

In the construction of the water supply system to the Western part of Vasilyevsky Island in St. Petersburg, one press-screw unit and two horizontal directional drilling units were involved. To locate drilling complexes on sites in the channel part of the Neva River near Petrovskaya and Arsenalnaya specialists of SP VIS-MOS LLC, two temporary artificial platforms were built to carry the main load.

The construction of crossings across the Taz River has become one of the most technically complex facilities of the Zapolyarye-Purpe oil pipeline system. start drilling operations before the opening of transport links arranged by winter roads Drilling operations were carried out in permafrost soil, in the conditions of the Arctic, at extremely low temperatures.

The construction of crossings was carried out in a short time using 6 drilling rigs simultaneously.

Drilling operations were carried out in permafrost with high abrasive properties. A drilling tool with special rock-breaking equipment was used for driving. Of particular difficulty was the preparatory period, due to the remoteness of the objects and the need to work in completely autonomous conditions.

Super-long crossing. The construction was carried out by two drilling rigs by docking oncoming pilot wells from opposite banks of the obstacle (Russky Island - Nazimov Cape). During the construction process, a modern navigation system was used that allows the wells to see" each other and ensures high docking accuracy. The strength of the overcome soil reached 174 MPa, which is comparable to the strength of metal and required the purchase of a specialized drilling tool from an Australian manufacturer.

The work was carried out in cramped conditions of mountainous terrain, on minimal sites, with a large elevation difference, in heavy-duty rocky soils. A particular problem was rock fissuring, local faults, interlayering of rocky and non-cohesive soils. This project involved laying a linear part of the pipeline in the Black Sea , and the connection sections were carried out using the horizontal directional drilling method with an exit point to the sea.

The construction of crossings was carried out in conditions of complex geology, in sandy gravel soil with a high percentage of large boulders. To pass the route, a special rock-cutting drilling tool developed by engineers of SP VIS-MOS LLC was used.

The construction of the crossing under the Uleima River took place in extremely difficult boulder soil, the diameter of the boulders exceeded two meters, which greatly hampered the development of the well. For successful construction, a drilling tool with reinforced rock-breaking elements was manufactured at the production base of LLC SP VIS-MOS.

To overcome difficult areas, a unified drilling tool was manufactured at the production base of SP VIS-MOS LLC. To stabilize the well, drilling fluid was selected directly at the construction sites in a mobile laboratory.