套破井卡封可洗井分注工艺管柱

注水井套管破裂后，注入水易通过套破段进入无效地层，造成对应油井的产量下降且增加水井地面能耗。大部分油田采用“封隔器卡封”方式进行分层注水，反洗井作业时洗井液容易通过套破段漏失进入地层，不能达到有效清洗井筒的目的。针对上述问题，利用双注管设计原理，进行了套破井卡封分注及有效反洗井工艺管柱的研究，关键工具采用内外管双层设计，正常注水的水流走内管，反洗井的水流走外管，实现正常注水通道与反洗井通道的分离。该工艺管柱在现场应用5井次，最大反洗井压力达到4. 0 MPa，最大反洗井排量达到25 m3/h，反洗井无漏失，取得良好应用效果, 该管柱可满足现场工艺要求。

Separate injection pipe string with the ability of well-flushing and pack setting for casing damaged wells

After the damage of casings in the water injection wells, injected water easily flows into the inefficient formation through the damaged part of casings, thus, the corresponding oil well production decreases and the surface energy consumption of water wells increases. Most oilfields use "packer setting" method for separate layer water injection. However, flushing fluid easily leaks into the formation through the damaged part of casings during inverse well flushing, so the purpose of cleaning well bore and formation can not be attained. To solve these problems, the pipe string with the technology of stuck sealing and separate layer injection for casing damaged wells and effective inverse well flushing was studied by using the design principle of double injection pipes. The key tools used double-layer design of inner and outer pipes with normally injected water flowing in the inner pipe and inverse well flushing water flowing in the outer pipe. Hence, the separation of normal water injection channel and inverse well flushing channel was achieved. This technology pipe string has been applied in the field for 5 well times. The maximum inverse well flushing pressure reaches 4.0 MPa and the maximum discharge capacity of inverse well flushing reaches 25 m3/h. The inverse flushed wells have no leakage and good application effect has been obtained. Therefore, this pipe string can meet with the field process requirement.