Mud compensation device of supersonic imaging logger

Abstract

The mud compensation device in the ultrasonic imaging logging instrument is applied to the ultrasonic imaging logging instrument, and is a mud compensation device with mud compensation function. The feature is: it consists of a connecting section, a cone transition section and a sound-transmitting window, the connecting section, the cone transition section and the sound-transmitting window are integrated as a whole, made of polytetrafluoroethylene, and the wall thickness is between 3-8mm. The connecting sections at both ends are cylindrical, with an outer diameter between 80-110mm, and the ends of the connecting sections are provided with internal threads. The sound-transmitting window is in the middle of the two connecting sections. The sound-transmitting window is a protruding cylinder with an outer diameter of 150-300mm and a height of 70-90mm. There is a cone transition section between the connection section and the sound-transmission window, and the inclination angle of the hypotenuse of the cone transition section is between 10-20 degrees. The effect is: the distance from the mud compensation device to the well wall is shortened, the propagation path of the sound wave in the mud is reduced, and the propagation attenuation of the sound wave in the mud is reduced; and the risk of sticking of the instrument in drilling can be reduced.

Description

technical field [0001] The invention relates to well logging technology in the fields of petroleum and hydrogeological exploration, in particular to an ultrasonic imaging well logging instrument, in particular to a mud compensation device with mud compensation function used on the ultrasonic imaging well logging instrument. Background technique [0002] An ultrasonic imaging tool is a device that uses an ultrasonic transducer to transmit sound pulses and receive reflected wave amplitudes and travel times to generate images of the borehole wall. The ultrasonic attenuation of drilling fluid in the borehole plays an important role in the characteristics of ultrasonic imaging logging tools. High values ​​of ultrasonic attenuation in the borehole can corrupt the ultrasonic imaging logging tool image. On the one hand, high values ​​of ultrasonic attenuation in slim boreholes can cause disturbing patterns (banding) in the image. Interference modes are caused by attenuated echoes,...

AI Technical Summary

Problems solved by technology

Overcoming the existing ultrasonic imaging logging tools, in wells with high mud density or wells with large boreholes, it is not easy to detect the lack of ultrasonic echo

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