Application of High Performance Comb-Type Polycarboxylate Dispersant in High-Density Saline Cement Slurries with High Ambient Temperatures

Xin, Haipeng (CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Laboratory of Cementing Technology, CNPC Key Laboratory of Drilling Engineering, Laboratory of Cementing Technology, National Engineering Laboratory of Petroleum Drilling Technology) | Wang, Jianyao (CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Laboratory of Cementing Technology, CNPC Key Laboratory of Drilling Engineering, Laboratory of Cementing Technology, National Engineering Laboratory of Petroleum Drilling Technology) | Wang, Xiangyu (No. 2 Cementing Branch Company, CNPC Bohai Drilling Engineering Co., Ltd.) | Yang, Kunpeng (CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Laboratory of Cementing Technology, CNPC Key Laboratory of Drilling Engineering, Laboratory of Cementing Technology, National Engineering Laboratory of Petroleum Drilling Technology) | Zeng, Jianguo (CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Laboratory of Cementing Technology, CNPC Key Laboratory of Drilling Engineering, Laboratory of Cementing Technology, National Engineering Laboratory of Petroleum Drilling Technology) | Zou, Jianlong (CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Laboratory of Cementing Technology, CNPC Key Laboratory of Drilling Engineering, Laboratory of Cementing Technology, National Engineering Laboratory of Petroleum Drilling Technology) | Sun, Fuquan (CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Laboratory of Cementing Technology, CNPC Key Laboratory of Drilling Engineering, Laboratory of Cementing Technology, National Engineering Laboratory of Petroleum Drilling Technology)

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ABSTRACT One of the main factors affecting the quality of salt layer cementing is the poor rheology of high-density saline cement slurry, which limits the implementation of improvement measures for improving cementing displacement efficiency. The high temperature in summer in Iraq accelerates cement hydration, which further leads to the reduction of cement slurry rheology. Affected by the continuous high ground temperature which could reach 60 °C in summer in Iraq, cement slurry was severely hydrated during the mixing process, resulting in poor fluidity, strong thixotropy and high initial consistency and this leads to difficulty in pumping and unstable density which seriously impact on on-site construction safety and cementing quality. Comb-type polycarboxylate dispersant synthesized via radical polymerization could solve dispersive problems such as poor dispersion and compression used in high pressure saline aquifers, large section of gypsum salt bed and offshore operations. After adding this dispersant, slurry prepared using saturation saline water and substitute ocean water exhibited strong dispersion ability, saturation salt resistance, and good performance without strength damage. Using a high-density saline cement slurry with a density 2.28 g cm resulted in 54 ml fluid loss, 16.5 MPa strength (24 h) as well as good stability and rheological property as flow behavior index n=0.72 and consistency factor K=1.03 Pa.s. The slurry was prepared at an ambient temperature of 60 °C. A comb-type polycarboxylate dispersant was applied to the high-density (2.28g cm) slurry and this was used for a 244.5 mm salt paste layer casing at 55–58 °Cambient temperature for 5 wells in Halfaya and Missan Oilfeild in Iraq. More than 85 % of the cementing job was excellent. INTRODUCTION During the drilling process, complex formations such as high-pressure saline formations, large salt paste formations, or water-sensitive formations were encountered (Chang, 2013; Da, 2012; Gao, 2014; Hou, 2013; Wei, 2014) both in China and overseas in Iraq, Kazakhstan, Uzbekistan, Indonesia and other countries (Chen, 2015; Gai, 2011; Zhou, 2011; Zou, 2015). In addition, in sea and beach operations, it is often attempted to directly prepare cement slurry with seawater (Chen, 2013; Lu, 2014). Due to the high solid content and high salt content, salt/seawater cement slurry exhibits poor fluidity, strong thixotropy and high initial consistency.

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