Multi-stage reducing reaming-while-drilling drilling rig and method based on radio frequency identification technology

Abstract

The invention relates to a multi-stage reducing reaming-while-drilling drilling rig and method based on a radio frequency identification technology. The multi-stage reducing reaming-while-drilling drilling rig and method are suitable for deep structure coal seam horizontal well underground multi-stage reaming. The multi-stage reducing reaming-while-drilling drilling rig includes a radio frequencyidentification excitation mechanism, an electro-hydraulic control mechanism and a multi-stage reaming recovery mechanism. The multi-stage reaming recovery mechanism is utilized to complete primary andsecondary expansion and recovery of a reaming knife wing; for reaming activation, an RFID system is adopted to activate the electro-hydraulic control mechanism, needed reaming conditions are changedby changing an electronic tag ball placed down, and remote control of the reaming is achieved; on the premise of no replacement of the drilling rig, reaming drilling in multiple modes such as a horizontal well, a vertical well and an inclined shaft is achieved in a soft formation such as deformed coal, and multi-stage reaming operation in a certain hole section can also be completed according to engineering needs; an excitation and reaming mechanism is reliable in structure, a reaming mode of the reaming-while-drilling drilling rig is reliable, the hole expansion rate is high, large-diameter pore forming can be achieved, the reaming stability is good, and the degree of automation is high.

Description

technical field [0001] The invention relates to a multi-stage variable-diameter reaming-while-drilling drilling tool and a method thereof, and is especially suitable for a multi-stage variable-diameter reaming-while-drilling drilling tool based on radio frequency identification technology and a method for multi-stage reaming in deep structural coal seam horizontal wells. method. Background technique [0002] Structural coal is widely developed in China and is rich in CBM resources. However, structural coal has prominent characteristics such as gas-rich, low permeability, softness, and fragmentation, which have become important objective factors restricting structural coal mining and CBM development. Drilling technology has been more and more widely used as a technical method for the development of coalbed methane in structural coal. However, in the drilling of soft and broken structural coal seams, it often shows that: ①During the drilling process, the stability of the bore...

AI Technical Summary

Problems solved by technology

Pulling out the drill to change the drilling tool assembly will increase the cost, increase the drilling cycle, and easily cause resistance and sticking. Therefore, it is necessary to complete the reaming work without lifting the drill

[0004] The current reaming equipment while drilling is mainly based on ball-throwing and differential pressure activation methods, with blades as the main blade form, mainly including mechanical reamers and hydraulic reamers, but the application effect is not obvious, mainly The performance is that the hydraulic reamer is controlled by the pump pressure, the diameter becomes larger when the pump pressure is increased, and the diameter becomes smaller when the pump pressure is decreased. ensure

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