2645 meters! Dagang Oilfield breaks the domestic record for the longest liner in side drilling wells

Zhaodong Oilfield is located in the extremely shallow waters of the Bohai Bay. Due to the characteristics of offshore development, the number of oilfield wellheads is limited. The development of new oil wells usually needs to be based on old oil wells, on the inner side of the casing of the old oil well boreholes. "Open the window" and then continue to extract oil. Such an oil well is also called a sidetrack well.

It is worth noting that Zhaodong Oilfield now has nearly 200 wellheads, but through advanced sidetracking technology, nearly 400 underground wellbores have been derived, and some old oil wells have been cleverly It has been used up to four times, demonstrating an example of intensive utilization of resources.

It is reported that this move has achieved intensive utilization of resources, but it faces difficulties in preventing collisions between underground wellbores, difficulty in transporting wellbore cuttings, and easy encounters with casing running pipes. Problems such as blockage and circulation blockage.

This side-tracking downhole liner saves 30% of the time compared to the same type in China, and significantly saves budget funds. The breaking of this drilling record provides a reference for similar types of sidetracking wells in China, and also provides more domestic tools and technical reserves for domestic offshore oil field development.