Application of horizontal well directional water plugging technology in Well Y2-P4

Cementation is usually not conducted outside the casing in horizontal section of a horizontal well completed by screen pipe, and the application of conventional water detection and shutoff tools is restricted. In this regard, the horizontal well directional water plugging technology was discussed for its applicability in Well Y2-P4 in the Zhongyuan Oilfield. Special K344 packer was used to seal the pre-determined section, and the high performance plugging agent annular chemical packer (ACP) was placed directionally to realize separation of formation outside the casing that was not cemented. Then, special K344 packer was used to verify the plugging effect of the ACP. Finally, special bayonet-tube packer was used to inject large volume of high performance plugging agent (ZR-PD) into the formation, so as to achieve the plugging of water-producing interval of horizontal section. Field application shows that, after water plugging, the average daily incremental oil was 3.7 t, and the water cut dropped by 4.5%. By the end of 2015, the interim total incremental oil was 1 023.6 t, the total decremental fluid was 22 983 m3, and the interim effective period was 398 d. The horizontal well directional water plugging technology is highly specific to certain application, and it can realize high success and apparent oil increasing and water decreasing effect.