Large Diameter Liner Hanger Cementing Technology Research and Application for High Temperature Deep Wells

The large-diameter liners in high-temperature deep wells present a series of technical challenges, including long open-hole sections, high bottom-hole static temperature (BHST), incompatibility between cement slurry and organic salt drilling fluid, significant temperature differences between the top and bottom of the cemented annular section, slow strength development at the top, presence of active gas zones with a high risk of gas channeling, and restricted annular flow area during liner hanger cementing. To address these issues, an anti-contamination spacer fluid system was developed by utilizing contamination-resistant materials and optimizing a compatible additive package. Additionally, a cement slurry system resistant to high temperatures, wide temperature variations, and gas migration was designed through a particle size distribution packing model and the selection of a low-viscosity fluid loss additive, a broad-temperature-range retarder, a high-temperature efficient comb-shaped polycarboxylate dispersant, as well as gas control and long-term strength stabilization additives. This cement slurry exhibits excellent rheological properties at high temperatures, rapid strength development at the top of the column, and overall performance that meets all field operational requirements. A balanced-actuator liner hanger was selected, providing a 34% larger flow area compared to conventional liner hangers. This design resolves challenges related to high-flow-rate circulation while running the casing to address wellbore complications, thereby increasing liner running speed and setting success rates. Prior to the operation, cementing parameters were optimized through specialized software simulation, enabling effective wellbore pressure control and improved mud displacement efficiency. The cement slurry system and cementing measures were successfully applied in Well GT-1, where field application yielded positive results, achieving a cementing qualification rate of 97.59%.