针对高温深井及长封固段井固井技术难题，开发了以高温大温差缓凝剂DRH-

Aiming at the technical problems of cementing in high-temperature deep wells and long-sealed cemented wells, a high-temperature large-temperature- <br>difference cement slurry system with high-temperature large-temperature-difference retarder DRH-2L and high-temperature fluid loss reducer DRF-2L as main agents was developed to overcome the cement slurry. The technical bottleneck of poor temperature resistance, weak ability to adapt to temperature differences, and slow development of the strength of the top cement paste; based on the theoretical analysis model of displacement, high temperature resistance and high efficiency prefluid system and balanced pressure cementing design as the core, it solves the displacement of deep and ultra-deep wells with small clearances The problems of low efficiency, poor interface bonding quality, and easy leakage; through the integration of key technologies, a complete set of high-temperature deep wells and large temperature difference cementing technologies have been formed to effectively ensure the quality of cementing. The technology has the ability of a bottom hole temperature of 230 ℃, a 7000m long sealing section of Tarim Basin, the ability to return cement slurry at one time.

In view of the technical difficulties of high temperature deep wells and long-sealed solid section wells, DRH-2L and high temperature dewatering agents with high temperature and temperature difference are developed<br>DrF-2L as the main agent of high temperature and temperature difference cement slurry system, overcome the cement slurry temperature resistance is poor, weak ability to adapt to temperature difference, the top cement stone strength slow development of technical bottlenecks; Well design as the core, to solve the small gap deep well ultra-deep well replacement efficiency is low, interface glue quality is poor, leak-prone problems, through the integration of key technologies, the formation of high temperature deep well and long sealing section of large temperature difference solidification set technology, effectively ensure the quality of solidification. The technology has a well bottom temperature of 230 degrees C, Tari wood basin area 7000m long sealing section cement slurry once back capacity.

Aiming at the cementing technical problems of high temperature deep wells and long cementing interval wells, high temperature and large temperature difference retarder drh-2l and high temperature fluid loss reducer were developed<br>The high temperature and large temperature difference cement slurry system with drf-2l as the main agent overcomes the technical bottlenecks of poor temperature resistance, weak adaptability to temperature difference and slow development of top cement stone strength. Taking displacement theoretical analysis model, high temperature resistance and high-efficiency pre fluid system and balanced pressure cementing design as the core, it solves the difficulties of low displacement efficiency, poor interfacial bonding quality and easy leakage in small gap deep and ultra deep wells Through the integration of key technologies, a complete set of cementing technologies with high temperature, deep well and long cementing section with large temperature difference has been formed to effectively ensure the cementing quality. The technology has the ability of one-time upflow of cement slurry in the 7000m long sealing section of Tarim basin at 230 ℃ bottom hole temperature.