Downhole fracturing zone data logger and downhole fracturing zone data acquisition system

1 . A downhole fracturing zone data acquisition system, comprising:

a soluble bridge plug placed in a downhole channel and snapped in the downhole channel after the bridge plug is expanded, a port of the bridge plug facing an entrance of the downhole channel being a positioning port; and

a data logger comprising a soluble sphere and a data acquisition module for detecting and acquiring environmental data, at least one mounting cavity being provided on the sphere, the data acquisition module being mounted in the mounting cavity, and at least a part of an inner wall of the mounting cavity being close to an outer peripheral wall of the sphere; and

wherein a fracturing fluid is continuously injected while the sphere enters the downhole channel, so that the fracturing fluid can push the sphere to reach the positioning port to plug the port of the bridge plug facing the entrance of the downhole channel, and the data acquisition module works to acquire and save the environmental data in the fracturing zone.

2 . The downhole fracturing zone data acquisition system according to claim 1 , wherein the bridge plug, the data logger and the fracturing fluid are injected again after each injection of the fracturing fluid and the data logger reaches the positioning port, so that a plurality of bridge plugs are distributed at intervals in the downhole channel, the data loggers and the bridge plugs are arranged in one-to-one correspondence, and the plurality of data loggers are sequentially numbered in the order of entering the downhole channel;

after the bridge plugs and the sphere of the data logger are dissolved, the data acquisition module floats to the entrance of the downhole channel under the buoyancy of the fracturing fluid; and

the data logger located at the entrance of the downhole channel is retrieved to read and analyze data.

3 . The downhole fracturing zone data acquisition system according to claim 1 , wherein at least one mounting cavity is provided on a surface of the sphere, a data acquisition module for detecting and collecting environmental data is provided in the mounting cavity, and an opening of the mounting cavity is provided with a soluble plug for plugging.

4 . The downhole fracturing zone data acquisition system according to claim 3 , wherein a plurality of mounting cavities are provided and are uniformly distributed on the surface of the sphere.

5 . The downhole fracturing zone data acquisition system according to claim 1 , wherein the data acquisition module comprises a housing, and the housing has a transmission module, a battery module, a single chip microcomputer module, a memory module and a transducer module built therein, and the transmission module, the battery module, the memory module and the transducer module are electrically connected with the single chip microcomputer module respectively.

6 . The downhole fracturing zone data acquisition system according to claim 5 , wherein the transducer module comprises a temperature transducer and a pressure transducer, and the temperature transducer and the pressure transducer are electrically connected with the single chip microcomputer module respectively.

7 . The downhole fracturing zone data acquisition system according to claim 5 , wherein the data acquisition module comprises a wireless charging coil, and the wireless charging coil is electrically connected with the battery module.

8 . The downhole fracturing zone data acquisition system according to claim 5 , wherein the transmission module comprises an infrared receiver and an infrared transmitter, and the infrared receiver and the infrared transmitter are electrically connected with the single chip microcomputer module respectively.

9 . The downhole fracturing zone data acquisition system according to claim 5 , wherein the housing comprises a cylinder with an opening at both ends or one end, and the opening of the cylinder is detachably connected with a cover body.

10 . The downhole fracturing zone data acquisition system according to claim 5 , wherein the housing has an overall capsule shape with hemispherical ends, and a bottom end of the mounting cavity is a hemispherical groove adapted to the hemispherical ends of the housing; and

the plug is made of a soluble rubber or metal, and the sphere is made of a resin.