关键词: 固井, 深井超深井, 天然气井, 水泥浆, 外加剂, 固井工具

Abstract: Cementing is an important link in the area of petroleum engineering technology. Based on the research efforts in the past years, CNPC has made great progress in cementing technology, basically establishing a system of cementing materials, cementing tools and related cementing process technology. In recent years, CNPC has made important achievements in cementing technology for deep and ultra-deep wells, horizontal wells, extended reach wells and long section with large temperature difference. Good results have been achieved in field application of cement slurry with ultra-high density and ultra-low density, latex cement slurry, and elastic slurry. Conventional cementing tools and accessories are brought under maturity with breakthroughs made in liner hanger and swelling materials. Cementing equipment is updated while initial progress is made in intelligent cementing quality control system. As the targets of oil and gas exploration and development are increasingly complicated, the research efforts at the next stage should be focused on cementing of complex ultra-deep wells, complex natural gas wells, gas-depot wells, non-conventional oil and gas wells and low-temperature deepwater wells, providing effective engineering technological support for higher oil and gas reserves and production.

Key words: cementing, deep wellandultra-deepwell, naturalgas well, cementingslurry, additives, cementing tools