Near-bit geosteering system

Abstract

The invention relates to a near-bit geosteering system. The system involves a measurement-while-drilling subsystem, a receiving nipple, a screw drill, a near-bit measurement transmitting nipple and adrill bit which are connected in sequence; the near-bit measurement transmitting nipple comprises a transmitting nipple main body, a transmitting end sensor set and a transmitting end main control board, wherein the transmitting end sensor set is arranged in the transmitting nipple main body and measures first drilling data including near-bit vibration data, azimuth gamma data and well deviation data, and the transmitting end main control board is arranged in the transmitting nipple body, is connected with the transmitting end sensor set and is used for transmitting the first drilling data; and the receiving nipple comprises a receiving nipple main body and a receiving end main control board, wherein the receiving end main control board is arranged in the receiving nipple main body, is inwireless communication connection with the transmitting end main control board and is used for sending the first drilling data to the measurement-while-drilling subsystem. The system can solve the problems that the landing point judgment is possibly inaccurate, a drill bit cannot enter a reservoir and the drilling rate is extremely low due to the fact that a sensor is far away from the drill bit in the prior art.

Description

Technical field [0001] This application relates to the technical field of oil drill detection volume, and in particular to a near-bit geosteering system. Background technique [0002] According to the current low-cost and high-efficiency shale gas development requirements, it is necessary to ensure that the drill bit enters the reservoir accurately and always drills in the reservoir. [0003] The traditional steering method uses a lead screw with LWD (Logging While Drilling). In this device, each measurement sensor of the LWD is located behind the screw drilling tool and is far from the drill bit. There will be a certain amount of measurement while drilling. Blind zone makes the measurement data lag, so that the landing point judgment may be inaccurate, the measurement accuracy is reduced, resulting in the drill bit cannot enter the reservoir or the dog's legs are large; when drilling in the horizontal section, if the judgment is not accurate, the drill bit may pass out Reservoirs...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a geo-steering system near the drill bit to solve the problems in the related art that the landing point may be inaccurately judged, the drill bit cannot enter the reservoir, and the drilling encounter rate is very low because the sensor is far away from the drill bit.

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