Distributed measurement system for downhole drilling tool combination based on optical fiber sensors
A technology of optical fiber sensor and drilling tool assembly, which is applied in the directions of measurement, earthwork drilling, wellbore/well components, etc., which can solve the problems of high cost and complex structure, and achieve the effect of low cost, small size and simple structure
Pending Publication Date: 2021-08-17
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology
Existing electrical measuring instruments are single-point measurements. To realize the distributed measurement of the actual working conditions of the entire drilling tool assembly, each sensor needs to be powered and distributed separately, with complex structures and high costs.
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[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] see Figure 1 to Figure 3 , a downhole drilling tool assembly distributed measurement system based on optical fiber sensors, including a drilling tool 03 that can be combined and connected between the drill bit 01 and the power supply bin 02, the front end of the drilling tool 03 is provided with a connector 031, and the tail of the drilling tool 03 There is a connecting section 032 at the end; the center of the connecting head 031 and the connecting section 032 is provided with an optical fiber connecting terminal 033, the rear of the connecting head 031 and the inner wall of the drilling tool 03 are laid with an optical fiber 034, and one end of the optical fiber 034 is connected to the optical fiber connecting terminal 033 at the center of the connecting head 031. Connecting, the other end of the optical fiber 034 is connected to the access end of the optical...
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The invention provides a distributed measurement system for a downhole drilling tool combination based on optical fiber sensors. The distributed measurement system comprises a drill collar which can be connected between a drill bit and a power supply bin in a combined mode, wherein optical fibers are laid on the inner wall of the drill collar, and the optical fibers are connected with an optical fiber sensor array which is tightly attached to the outer wall or the inner wall of the drill collar through optical fiber connecting terminals; and an optical signal transmission module, an optical signal demodulation module, a circulator and a processor are integrated in the power supply bin; the optical signal transmission module senses the change of the physical quantity of each measured point, then each returned optical signal enters the optical signal demodulation module through the circulator, the corresponding measured physical quantity is obtained through demodulation and sent to the processor, a measurement basis is provided for the processor to control the working state of the drilling tool combination, and therefore optimization of the drilling tool combination is achieved. The distributed measurement system has the advantages of being simple in structure, accurate in measurement, efficient and practical.
Description
technical field [0001] The invention belongs to the technical field of downhole drilling, in particular to an optical fiber sensor-based distributed measurement system for downhole drilling tool assemblies. Background technique [0002] Bottom Hole Assembly (BHA for short) is a general term for tools located at the front end to achieve rock breaking, steering and measurement during drilling, including drill bits, rotary steering tools or / and mud motors, measurement-while-drilling tools, and drilling-while-drilling tools. Mud logging tools, weighted drill pipes, drill collars, adapters, drill tool stabilizers, shock absorbers, jars, etc. In the downhole drilling tool assembly, during the drilling construction process, it is necessary to collect the information of the bottom layer where the tool is located to realize real-time monitoring; in addition, it is also necessary to predict the possible failure of the drilling tool, otherwise it will affect the drilling speed and thre...
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IPC IPC(8): E21B47/00E21B47/135
CPCE21B47/00
Inventor 李飞吕方兴谭瑜琦
Owner XI'AN PETROLEUM UNIVERSITY