Measurement while drilling device

Abstract

The invention discloses a measurement while drilling device. The device comprises a protection sleeve, a neutron circuit framework, a density circuit framework, a while-drilling compensation neutron measurement assembly and a while-drilling direction and density imaging assembly. The protection sleeve is formed by machining an independent drill collar and seals and protects inner structures and devices of the protection sleeve. The neutron circuit framework is mounted on the upper portion in the protection sleeve. The density circuit framework is mounted on the lower portion in the protectionsleeve and is in butt joint with the neutron circuit framework. The while-drilling compensation neutron measurement assembly is mounted on the neutron circuit framework. The while-drilling direction and density imaging assembly is mounted on the density circuit framework. According to the device, a density logger and a compensated neutron logger are integrated in the same drill collar, and therefore the operation difficulty of mounting the density logger and the compensated neutron logger and carrying out testing is greatly reduced. Compared with the prior art, according to the device, the length of a logger can be effectively reduced, and consistency of compensated neutron measurement and while-drilling density measurement can be improved.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a measurement-while-drilling device. Background technique [0002] In the field of geological exploration, density logging and neutron logging while drilling play an important role in the field of logging while drilling, and play an important role in timely identifying formation lithology, calculating porosity, permeability, oil saturation, and oil and gas shows. It is a necessary parameter for the fine evaluation of the formation while drilling, and it is also one of the key technologies for identifying gas layers. [0003] In order to accurately conduct geosteering, the density while drilling usually needs to measure the azimuth formation density imaging and pick up the dip angle of the formation, so that the wellbore trajectory can be precisely adjusted according to the change of the formation structure, and the penetration rate of the oil layer can be improved. Therefore...

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Problems solved by technology

[0005] Aiming at the problem of cumbersome operation in the installation and measurement process of medium density logging tool and compensated neutron logging tool in the prior art, the present invention provides a measurement-while-drilling device, which includes:

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