China Petroleum Pipeline No.4 Company set another record for directional drilling
At the beginning of March, the Chittagong – Dhaka (CDPL) project in Bangladesh, contracted by the Fourth Pipeline Company, successfully pulled back the double pipeline crossing the main channel of the Megna River. So far, the two crossings of the CDPL project participated by the company has been successfully completed, which has set a new record for the longest directional drilling crossing in Bangladesh.
CDPL project includes two pipeline crossings, of which 825m directional drilling has been successfully towed back. The crossing of the main channel of the Megna River is a key and difficult project of the CDPL project. The design horizontal length is up to 2500m, far exceeding the previous crossing length records in Bangladesh. The project adopts the method of one hole and two dragging to pull back the double pipe line at one time, in which the main pipe diameter and wall thickness are 406mm × 11.1mm, optical cable sleeve size is 152mm × 8.7mm； The crossing geology is mainly composed of clay, silty sand, silty fine sand, mixed with a small amount of mica and small particles of feldspar. The geological composition is complex and the crossing is difficult. In addition to the above difficulties, the Project Department also overcame many adverse factors, such as poor social support, difficulties in equipment mobilization, insufficient pipeline prefabrication site, complex geology, difficulties in drill pipe transportation, etc. After two stages of reaming, it finally took 44 days to pull back successfully.
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