Water curtain drilling optimization setting method based on dynamic evaluation of water-rich characteristics of surrounding rock

Abstract

The invention relates to the field of geotechnical engineering, in particular to a water curtain drilling optimization setting method based on dynamic evaluation of water-rich characteristics of surrounding rock. The method includes the following steps that (1), according to the geological conditions of a reservoir area, it is determined that a water curtain hole is a horizontal water curtain holeor a vertical water curtain hole, and a water curtain roadway is designed; (2), a transient electromagnetic test is performed on the water curtain design plane after construction of the water curtainroadway is completed, a water-rich zone and a water-poor zone are found, water curtain holes with the hole spacing being14-20m are arranged in the water-rich zone, and water curtain holes with the hole spacing being 5-10m are arranged in the water-poor zone; and (3), a water curtain test is performed on the water curtain holes, and reperforating is carried out according to the test result. The water-rich zone and the water-poor zone in a geological zone are considered in the water curtain drilling optimization setting method, the distances of the water curtain holes are designed separately, the best water sealing effect can be achieved, and the water curtain drilling optimization setting method is relatively simple to operate.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a water curtain drilling optimization setting method based on dynamic evaluation of water-rich characteristics of surrounding rocks. Background technique [0002] At present, the oil storage method of underground water-sealed caverns is the main oil storage method in many countries and regions. Its biggest feature is that water curtain roadways are set above the storage caverns, and horizontal or vertical water curtain holes are arranged along the water curtain roadways according to geological survey results. In the form of water injection through the water curtain hole, the rock cracks are filled to form a water curtain to maintain the liquid and air tightness of the cavern. [0003] In the current water curtain drilling method, the spacing of the water curtain holes is often directly determined as 20m, and then the holes are refilled according to the specific water curta...

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Problems solved by technology

[0003] In the current water curtain drilling method, the spacing of the water curtain holes is often directly determined as 20m, and then the holes are refilled according to the specific water curtain hole water injection test and connectivity test. On the one hand, this method is cumbersome to operate. On the other hand, the finally obtained water curtain hole spacing is often not very suitable. For example, under the geological conditions where the water curtain hole spacing is most suitable for 15m, the distance obtained by the above method can only be 20m or 10m

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