关键词: 固井, 天然气井固井, 水泥浆, 外加剂, 固井工具

Abstract: Based on the technological research during the “12th Five-year Plan Period”, CNPC has made a significant progress in cementing technological areas, such as long cementing section well with a large temperature differential, deep-layer complicated natural gas well, shale gas well and gas storage well. Displacement efficiency is also improved substantially at the same time. Good results have been achieved in field application of cementing materials, such as hightemperature resistant cement slurry, large temperature differential cement slurry, flexible cement, phosphate cement, and self-healed cement. Conventional cementing tools become increasingly mature while breakthroughs are made in special cementing tools. Cementing equipment is also modernized with the progress in intelligent technology for cementing quality control. Cementing theoretical research is enhanced in the areas of cement sheath sealing integrity and set cement toughness modification mechanism. The cementing sector will face a series of new challenges in the “13th Five-year Plan Period” owing to the influences of such factors as the increasingly complicated targets for oil and gas exploration and development, low oil prices, less workload and technological competition. It is necessary to improve technological creativeness and core competitiveness. The sustainable efforts research work should be focused on complicated deep well and super-deep well, complicated natural gas well, complicated adjustment well, non-conventional oil and gas well, and wellbore sealing integrity, providing more effective technological support for oil and gas exploration and development.