川东深井固井技术

川东地区地质情况复杂,上部地层为低压漏失层,裂缝、溶洞发育,下部为高压气层,气产量大、关井 压力高、硫化氢含量高,同一裸眼中气显示层段多、压力系统复杂、高低压力同存。针对川东复杂地质情况固井采 用正反注水泥技术、分级注水泥技术、平衡压力固井技术、抗盐水泥浆体系等固井工艺技术,确保了川东深井复杂 井固井质量,固井质量合格率100％。

Cementing Technology for Deep Wells in Eastern Sichuan

The geologic condition of eastern Sichuan area is very complex. Its upper formation is low - pressure lost -circulation zone with growing fractures and karst caves, while its lower part is high - pressure gas - bearing formation characterized by high gas production rate, high shut - in well pressure and high hydrogen sulfide content. In addition, gas show happens in several zones whose pressure system is very complicated as well as high and low pressure coexisting in one open hole. Aiming at these complex conditions, forward and reverse cementing technology, multiple stage cementing technology, balanced - pressure cementing technology and salt -resisting cementing technology are adopted. By which, the cementing quality in eastern Sichuan have been guaranteed and their qualification rate is 100% .