Downhole instrument unit

Abstract

The invention discloses a downhole instrument unit. The downhole instrument unit comprises a short receiving acoustic system section, a short sound insulator section and a short transmitting acousticsystem section which are successively connected; the short receiving acoustic system section comprises a receiving sleeve, a receiving circuit module arranged on the receiving sleeve, and several receiving transducers; the short transmitting acoustic system section comprises a transmitting sleeve, a transmitting circuit module arranged on the transmitting sleeve, and several transmitting transducers. The downhole instrument unit is comprehensive in functions and comprises a large-power monopole longitudinal wave transmitting transducer, a lower-frequency broadband orthogonal dipole transmitting transducer and a broadband receiving transducer array, a monopole sub sensor adopts a large-power transmitting design and can acquire information of stratum longitudinal waves of a tower footing, and a dipole sub transmitting transducer adopts a lower-frequency broadband design and can acquire information of transverse waves in the low-speed seabed stratum; information of the longitudinal waves,transverse waves and reflected waves of the stratum can be acquired through measurement in a well at a time, and various mechanical property parameters, required for building footings of wind towersand electricity pylons, of the stratum can be acquired.

Description

technical field [0001] The invention relates to the technical field of offshore wind power exploration design and offshore exploration and logging equipment, in particular to a downhole instrument unit. Background technique [0002] Offshore wind power exploration and design is an essential link in the preliminary work of offshore wind power, and is the basis for the design, construction and construction of offshore wind power tower foundations. The design evaluation of offshore wind power tower foundation mainly includes several technical approaches, namely conventional geophysical prospecting technology, downhole measurement technology and borehole sampling technology. Each technology includes different implementation methods and forms a variety of measurement and implementation instrument products. [0003] The downhole acoustic logging instruments currently used for offshore wind power tower foundation detection are mainly conventional dual-transmitter and dual-receiver ...

AI Technical Summary

Problems solved by technology

At present, the main problems faced by the existing instruments include: First, the instrument has a single function. The existing instruments can only complete the measurement of the monopole longitudinal wave, obtain the formation longitudinal wave velocity near the well wall, and cannot measure the formation in the base area of ​​the tower and the formation in the formation. Second, the performance of the instrument is insufficient. The existing instrument has a single operating frequency, a high main frequency, and a narrow bandwidth. , such as formation longitudinal wave, shear wave and reflected wave, etc.

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