低压油气藏地下储气库井射孔工艺优化

利用低压油气藏老井建设的地下储气库，注、采气需要“大进大出”，储层到井筒要有非常好的通道。射孔作业可以为油气提供良好的通道，但也会造成储层污染甚至损害，若射孔作业过程中的器材选择、参数设计不合理，对地层造成的污染和损害甚至比钻井过程中的更严重；因此，需要对射孔施工工艺进行优化，以减少或避免储层污染和损害，使油气井达到预期产能。根据研究区低压油气藏老井固井完井特点，结合地层实际情况，对建设地下储气库所利用的这些老井的射孔施工方案进行了优化设计。该方法对低压油气藏储气库注采井射孔施工具有一定的参考意义。

Underground gas storage can be built by using the oil well in low pressure reservoir. The amount of gas injection and production for reservoir need be much large. There is a good passage from reservoir to well. Perforating operation can provide channels for oil and gas, also can cause pollution or even damage. If the perforating technology (Equipment, parameter and negative pressure value, etc) is not reasonably selected, the pollutions or damages are more serious compared with that in the process of drilling. Therefore, the perforating technology should be optimized to avoid the reservoir pollution or damage and attain the expected productivity of oil well. In this study area, the depth of old wells in the fault blocks reservoir with low pressure is between 3,300 and 5,500 m. Lost circulation accidents happen repeatedly in these old wells. What′s more, the bottom layers with low pressure and high permeability exist in the reservoir, and the cementation of the bottom layers is not good, which is the section occurred accidents more easily. Based on the characteristics of cementing and completing, the perforation optimization job is necessary in constructing the underground gas storage by using these old well and the perforation technology is optimized combined with the actual situation of reservoir. In order to complete the construction task promptly, safely and economically, the construction technology considers construction progress and material supply.

10.6056/dkyqt201302032