Drilling Completed Successfully, Setting Seven Drilling Records in A Row

Recently, the second opening of the Bazhong 101HF well drilled by the 70176 team of the Southwest Branch of Shengli Petroleum Engineering Company was successfully completed. The drilling fluid for the second opening was in progress. The daily footage of the second opening of the Lianchuang Yuanba block was 502 meters, and the single-trip drilling footage was 2,562 meters. meters, the highest and average mechanical drilling speeds were 14.28 meters/hour and 12.91 meters/hour respectively, the drilling cycle was 20.5 days, the drilling was completed in 2 trips, and the deepest completed drilling depth of the second drilling was 4,000 meters. 7 new records for the second drilling in the block .

Well Bazhong 101HF is located in the Tongjiang-trending oblique Bazhong-northwest fault fold zone in the low-gentle fold belt of northern Sichuan. It is a key evaluation well deployed by Sinopec Exploration Branch. The designed well depth is 5,370 meters, and the second open hole section is 3,400 meters long. It uses 311.2 During the construction of the millimeter drill bit, five sets of formations with different pressure coefficients were drilled in the Jianmenguan Formation, Penglaizhen Formation, Upper Shaximiao Formation, Lower Shaximiao Formation, and Lianggaoshan Formation. There were many layers crossed, and drilling encounters occurred in adjacent wells. Risk of air leakage and crack leakage.

The adjacent wells in the Shaximiao and Lianggaoshan Formations frequently experience leakage and gas intrusion, making construction difficult. In view of this situation, during the construction, the team focused on the stability of the well wall as an important aspect, selected a reasonable drilling fluid window based on the actual drilling conditions, and based on the principle of stable pressure and no leakage, selected a reasonable drilling fluid density to ensure that the well wall stability. At the same time, the mud performance monitoring is strengthened during actual drilling. The return of the vibrating screen is one of the key tasks in each shift, and the responsible person is assigned to report it every half hour via walkie-talkie. This not only ensures underground safety, but also improves the mechanical quality. Drilling speed.