柳泉油田泉2断块强水敏粉细砂岩储层防砂技术

The sand precontrol technology of strong water-sensitive reservoir in Quan 2 fault block in Liuquan Oilfield

柳泉油田泉2断块储层岩性为粉细砂岩,油层薄、产量低、出砂严重,油井无法正常投产。针对断块低温、强水敏、水平井防砂井段长等难点,开展了长水平段高压砾石充填先期防砂工艺研究,设计了连续充填工艺管柱,并配套完善了完井液体系、射孔方案及携砂液体系,将防砂、治砂、改造储层相结合,开展了4口井的现场试验,取得了较好的应用效果。该项技术在泉2断块的成功应用,扭转了该薄层强水敏粉细砂岩油藏长期未能有效动用的被动局面,同时也为其他同类型油藏的开发提供了技术思路。

The reservoirs in the Quan 2 faulted block, Liuquan Oilfield, are dominated by slitstone, where oil wells cannot be normally put into production due to thin oil layers, low productivity and severe sand production. Considering the challenges in the faulted block, such as low temperature, strong water-sensitivity, and long sand control section in horizontal well, a study was made on premature sand control concerning HP gravel pack in long horizontal section. The continuous packing string was designed, and the corresponding completion fluid system, perforation program and sand-carrier fluid system were improved. In this way, sand prevention, sand control, and reservoir stimulation were combined in this technique. It has been successfully applied in 4 wells in the Quan 2 faulted block. This technique makes the thin and strong water-sensitive slitstone oil reservoir no longer non-producible, and also provides a technical reference for the development of other similar reservoirs.