While-drilling well wall ultrasonic imaging logging device

Abstract

The invention provides a while-drilling well wall ultrasonic imaging logging device. The logging device comprises a drill collar with a middle water hole, an ultrasonic probe assembly used for transmitting and receiving ultrasonic pulse signals, an ultrasonic measurement and control assembly used for exciting, collecting and processing the ultrasonic pulse signals in real time, and a wire passing pipe assembly used for communicating with the outside, wherein the ultrasonic measurement and control assembly is connected with the ultrasonic probe assembly and the wire passing pipe assembly, the ultrasonic measurement and control assembly and the ultrasonic probe assembly are arranged on the outer side wall of the drill collar, and the wire passing pipe assembly is arranged in the middle water hole of the drill collar. The logging device has the advantages of being convenient to combine and connect, capable of obtaining well wall medium ultrasonic images in real time, capable of being applied to complex working conditions and the like.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to an ultrasonic imaging logging device while drilling. Background technique [0002] The development of modern drilling technology promotes the development of logging-while-drilling technology in the direction of informatization, visualization, and intelligence. Drilling in different layers and keeping the wellbore stable, reducing or avoiding drilling accidents such as lost circulation, well kick, collapse, and stuck pipe. [0003] At present, there are mainly three imaging technologies of gamma, density-neutron and resistivity imaging while drilling. The above-mentioned imaging technology can intuitively obtain image information such as formation boundary, formation dip angle, geological characteristics of borehole wall and borehole condition, etc., so as to find the reservoir position and keep the wellbore trajectory in the "sweet spot" of the reservoir, ensuring large-scale...

AI Technical Summary

Problems solved by technology

Although the wireline ultrasonic imaging logging technology can obtain intuitive images of the borehole wall, it has the following defects: on the one hand, due to the impact of drilling fluid invasion, the drilling fluid fills part of the natural induced fractures on the borehole wall interface, thus limiting the wireline logging. Acquisition of medium and high-resolution borehole wall images; on the other hand, wireline logging operations require the drilling tools to be taken out of the borehole, resulting in a lot of waste of time and financial resources, and it is impossible to conduct real-time guidance and decision-making for drilling during the drilling process

In view of the shortcomings of the existing wireline ultrasonic imaging logging technology, while drilling wall ultrasonic imaging logging technology began to develop, but the existing drilling wall ultrasonic imaging logging technology is integrated in the density-neutron or micro-resistivity while drilling In the imaging logging system, it is very inconvenient to maintain and match with other tools, and the price is expensive, which limits the application range of imaging logging while drilling

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