Pressure control reverser, in-situ stress measurement equipment and in-situ stress measurement method using same

Abstract

The invention provides a pressure control commutator, in-situ stress measurement equipment applying the pressure control commutator, and an in-situ stress measurement method using the equipment. According to the electromagnetic valve, switching of multiple working channels can be conveniently achieved, the number of the electromagnetic valves is increased, and more working channels can be increased. According to the in-situ stress measurement equipment, rock fracturing and crack orientation measurement tasks of a plurality of fracturing sections can be completed at the same time under the condition of one-time drilling only by connecting a plurality of packers and impression devices in series, and the working efficiency is improved.

Description

technical field [0001] The present application relates to a hydraulic fracturing method for in-situ stress measurement technology, and in particular, to a pressure control commutator, an in-situ stress measurement equipment, and an in-situ stress measurement method using the same. Background technique [0002] In-situ stress measurement by hydraulic fracturing is an in-situ stress measurement method developed in the 1970s. This method can obtain various parameters of current in-situ stress in the formation without knowing the mechanical parameters of the rock. Continuous or repeated tests at any depth, fast measurement speed, and reliable measurement values ​​have been widely used in recent years and have achieved a lot of results. [0003] The principle of in-situ stress measurement by hydraulic fracturing method is as follows: figure 1 shown. [0004] A length (frac section) is sealed at a selected measured depth in borehole 8a using a pair of inflatable packers (includi...

AI Technical Summary

Problems solved by technology

Sometimes the wall of the borehole is slippery, and the expanded packer will move slowly with the drill pipe, resulting in inaccurate positioning of the reversing valve switch stretching or compression position, making it difficult for ground personnel to determine the working status of the reversing valve

In more serious cases, it will be difficult to determine the middle position, the water discharge channel cannot be connected, and the measuring equipment will be stuck at the bottom of the well, resulting in unexpected accidents of measurement failure.

[0009] In addition, the mechanical reversing valve has only three working channels. After the fracturing measurement is completed, the fracturing packer and other equipment must be lifted to the ground, replaced with a stamper, and placed again at the fracturing section for directional measurement.

When the measurement depth is large, it is very labor-intensive and time-consuming to replace the equipment, which seriously affects the measurement efficiency

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