自清洁动态负压射孔技术研发及应用

Development and Application of Self-cleaning Dynamic Negative Pressure Perforating Technology

聚能射孔弹射孔后产生射孔孔道,同时也因对岩石的挤压而形成渗透率低的破碎压实带区,这种射孔压实伤害使得射孔完井平均表皮系数增大,直接降低了射孔井的产能。“自清洁+动态负压”射孔技术实现了对射孔孔道的二次抽吸,消除了射孔压实,大大降低对地层的伤害。由于负压自清洁射孔降低液面有井喷风险,而动态负压液面安全范畴更广,该种工艺方法风险小,投入相对较小,该技术成果在南海东部油井开发射孔应用。数据表明:自清洁射孔和动态负压作用明显,该井自清洁产生的微压裂及清洁孔道最高压力19.9 MPa,动态负压最低点压力值9.7 MPa,最大负压差18.2 MPa,动态负压持续时长585 ms。措施前日产液5300桶(1桶=0.159 m^(3)),含水91%,日产油470桶;措施后日产液5400桶,含水85.5%,日产油787桶,作业效果明显。

The perforation tunnel is generated after the shaped perforating projectile perforates,and the crushed and compacted zone with low permeability is formed due to the extrusion of the rock.This perforation and compaction damage increases the average skin coefficient of the perforation completion,which directly reduces the productivity of the perforated well.The self-cleaning+dynamic negative pres-sure perforation technology realizes the secondary suction of the perforation channel,eliminates the perforation compaction,and greatly reduces the damage to the formation.Negative pressure self-cleaning perforation produces a risk of blowout in lowering the liquid level,while the dynamic negative pressure liquid level has a wider safety range,so this process method has little risk and the investment is rela-tively small,and this technical technical achievement has been applied to the perforation of well development in the eastern oilfields of south sea.The data shows that the effect of self-cleaning perforation and dynamic negative pressure is obvious;the maximum pressure of micro-fracturing and cleaning channels generated by self-cleaning in this well is 19.9 MPa,the lowest pressure value of dynamic nega-tive pressure is 9.7 MPa,the maximum negative pressure difference is 18.2 MPa,and the duration of dynamic negative pressure is 411 milliseconds.Before the use of measure,the liquid production was 5300 b/d,with the water capacity 91%,and the oil production 470 b/d.After the measures,the liquid production was 5400 barrels/day,with the water capacity 85.5%,and the oil production 787 barrels/day.The operation effect is obvious.