Sensor module, sensor assembly and acoustic logging tool

A sensor assembly configured to be mounted on a drill collar base body, comprising:

• sensor module comprising a main body shell and a sensing device arranged in the main body shell, wherein the sensing device comprises a sensor, an upper cover plate, a lower cover plate and a circuit board, the sensor is mounted on the circuit board, the upper cover plate and the lower cover plate are mounted on upper and lower sides of the circuit board respectively, and are configured to support the main body shell and fix the circuit board, an accommodation cavity configured to store insulating fluid is provided between the upper cover plate and the circuit board, between the upper cover plate and the sensor, and between the lower cover plate and the circuit board, and a portion of the upper cover plate above the sensor is provided with a first acoustic window;
• and
• a balance module comprising a balance chamber body, a sealing piston, and an elastic member,
• wherein a first end of the main body shell along an axial direction is provided as an opening for communicating with a balance module, more than one balance channels are arranged in the balance chamber body, and each balance channel is divided into two cavities by the sealing piston, wherein one of the cavities is communicated with the accommodation cavity, and the other of the cavities is communicated with outside of a drill collar, and two ends of the elastic member are respectively connected to the sealing piston and the balance chamber body, and the elastic member is configured to be capable of providing damping for sliding of the sealing piston in the balance channel;
• wherein the sensor module further comprises a protective sleeve sleeved outside the main body shell, two side surfaces of the balance chamber body are each provided with a first protrusion, and two side surfaces of the protective sleeve are each provided with a second protrusion, the first protrusion and the second protrusion are configured to be clamped into a first groove and a second groove on two sides of a vacancy which is provided on an outer surface of a drill collar base body.