普光气田长井段延时起爆射孔技术

Long channel delayed ignition perforation technology in Puguang Gas Field

普光气田具有井深、射孔井段长、高含H2S等特点,射孔作业潜在的安全风险较大。针对普光气田射孔面临的技术问题和难点,从射孔工艺选择、射孔枪及射孔参数确定、抗硫材料选取、油管保护、起爆及传爆可靠性设计等方面进行阐述。通过对普光气田主体的射孔作业效果分析,证实采用防硫114射孔枪并进行变孔密射孔等技术设计能满足普光气田射孔后的酸压改造要求,不同壁厚管柱组合、分段延时射孔、纵向和径向减震器组合等技术措施可有效地防止油管脱扣,增强型固弹系统可以满足长井段射孔可靠传爆的要求。

Puguang Gas Field is characteristic of deep reservior,long hole interval to be perforated and rich H2S.These features brings risks to perforation and operation safety.This paper presents the choice of perforation technology,defination of perforating gun and perforation parameters,selection of sulfide resistance material,tubing protection,design of ignition and detonation propagation reliability related to technical problems and dificulties on perforation operation in Puguang gas field.The perforation effectiveness analysis shows such technical designs can satisfy the requirement of acid fracturing after perforating in Puguang gas field as using anti-sulfur 114 perforators and changing the perforation density.Tubing tripping can be prevented effectively by using some technical measures such as different tubing thickness combination,partition time delayed perforation,combination of longitudinal shock absorber and radial direction shock absorber.Enhancement type fixed bullet system can meet the request of reliable detonation of long-channel perforation.