Cementing technology for adjustment wells of Punan 3/5 blocks in Daqing Oilfield

Punan 3/5 blocks are located in south- Putaohua Structure, extending to the south, in the second-level of structural elements of Daqing Placanticline. The reservoirs are still dominated by structure. The depth of reservoir is from 950m to 1000m. Because of complex geological conditions, circulation loss, well kick, borehole collapse and oil/gas emits outside casing after cementing easily happened during the drilling process and completion. The cementing quality could not be ensured. By the analysis of the influence factors on cementing quality, and according to completion technique, cement slurry system and cementing methods, the corresponding solutions are planned. Nondrilling-two–stage cementing, circulation loss control cement slurry and bi-setting cement slurry were used for circulation loss in weak formations. Anti-channeling Cementing operations were used in low permeability and high pressure reservoirs. In 2010, cementing jobs on 45 wells were all conducted successfully in Punan 3/5 blocks, and the excellent ratio was 75%, which indicated a matching cementing technology is formed for this area.