Near-bit geosteering drilling system

Abstract

The invention discloses a near-bit geosteering drilling system. The near-bit geosteering drilling system comprises a screw drilling tool connected with a bit, a near-bit measuring short section integrated with the screw drilling tool, an underground receiving short section, an MWD underground short section and a ground information processing system, wherein the near-bit measuring short section obtains near-bit geological parameter information and track parameter information and transmits the information to the underground receiving short section in a wired transmission mode; and the underground receiving short section forwards the received information to the MWD underground short section, the MWD underground short section classifies and encodes the information and generates regular mud pressure change signals, and the ground information processing system collects the mud pressure change signals and processes the mud pressure change signals so as to display corresponding information. The near-bit measuring short section and the screw drilling tool are integrated, so that the screw drilling tool can normally drill, and meanwhile the wired signal transmission mode is adopted, so thatthe information transmission stability is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration, in particular to a geosteering drilling system near a drill bit. Background technique [0002] Oil well logging is an essential technical service component of drilling engineering in the process of oil and gas exploration and development. The conventional logging tools used for measurement are all post-drilling measurements, which cannot effectively analyze and control wellbore trajectory in real time. With the demand for production, engineers and technicians are required to understand the changes of wellbore trajectory and formation information in a timely manner, and adjust their posture in time, especially for identifying thin oil layers and improving drilling efficiency, which is of great significance. With the continuous development of downhole measurement technology, measurement while drilling (MWD, MeasurementWhile Drilling) and logging while drilling (LWD, Lo...

AI Technical Summary

Problems solved by technology

[0003] In the current measurement-while-drilling system and logging-while-drilling system, the collected information is sent to the downhole signal receiving system through wireless transmission. Signal transmission is unstable

In addition, in the current measurement-while-drilling system and logging-while-drilling system, the near-bit measurement sub and the screw drilling tool adopt a split design to adapt to different screw drilling tools. However, when the split design is adopted, the screw drilling tool During the drilling process, there is a risk of detachment of the measuring sub near the drill bit, which affects the drilling of the drill bit

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