A near-bit geosteering detection system

Abstract

The invention provides a near-bit geology guide detecting system, comprising an electricalresistivity detecting unit, a gamma detecting unit, a position sensing unit and an insulating dipole transmitting unit, wherein the electricresistivity detecting unit is used for measuring the electricresistivity a near-bit stratum to generate electricresistivity data; the gamma detecting unit is used for measuring near-bit gamma rays to generate gamma ray data; the position sensing unit is used for measuring near-bit inclination and an implemental surface to generate position data; and the insulating dipole transmitting unit is used for transmitting the electricresistivity data, the gamma ray data and the position data to the ground through a wireless electromagnetic signal channel. A sensor is close to the near bit as much as possible, so when a drill drills into the sensor, the sensor makes an early prediction to information of the front part of the drill and information of the periphery stratum of the drill, thereby the aim of geology guide is achieved during drilling process.

Description

technical field [0001] The present invention relates to measurement while drilling or geosteering measurement technology in logging while drilling for petroleum, mining and geological exploration, especially relates to near-drill bit measurement and wireless transmission technology of downhole measurement data, specifically a near-drill bit geosteering detection system. Background technique [0002] In drilling projects such as petroleum, mining, and geological exploration, it is required to make the drilling trajectory more accurate and drill according to the engineering design requirements, timely and accurately grasp formation information to identify thin oil layers to improve drilling efficiency, and transmit formation information to the ground in real time. In this way, engineers and technicians can keep abreast of wellbore trajectory and formation information changes. [0003] However, in the current drilling engineering, the sensors of many drilling systems have a ce...

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Problems solved by technology

[0003] However, in the current drilling engineering, the sensors of many drilling systems have a certain distance from the drill bit, which reduces the detection range and detection accuracy.

Although the sensors in some drilling systems are installed very close to the drill bit, there is no formation resistivity detector in the formation parameters, and when the data collected by the sensors is uploaded, the transmission channel is a wireless short transmission channel, and the data cannot be directly transmitted to the ground , must be relayed and then transmitted to the ground, which greatly reduces the transmission rate

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