Drilling simulation device and method for horizontal well drilling and reaming in tectonic coal reservoir

Abstract

The invention discloses a drilling simulation device and method for horizontal well drilling and reaming in a tectonic coal reservoir. The drilling simulation device and method are applicable to the horizontal well drilling and reaming drilling research of a deep tectonic coal seam. The drilling simulation device comprises a drilling system, a coal and rock mass loading system and a PLC control system; the drilling system comprises a drilling machine base; a square guide rail base is arranged on the drilling machine base; guide rail sliding blocks are arranged on the square guide rail base; asliding table B is arranged on the guide rail sliding blocks; a power driving NMRV reducing motor, a variable-diameter reaming control mechanism and a straight-through high-speed rotary joint are arranged on the sliding table B; a double-layer drill rod in a through hole in a through hole type speed reducer penetrates through the through hole; a drill rod centralizer is arranged on one side of thedrilling machine base; the double-layer drill rod is arranged on the straight-through high-speed rotary joint; one end of the double-layer drill rod is connected to the variable-diameter reaming control mechanism; the other end of the double-layer drill rod penetrates through the drill rod centralizer to be provided with a variable-diameter reaming drill bit; and a pilot drill bit is arranged atthe top of the variable-diameter reaming drill bit. The drilling simulation device has the advantages that the size is small, the operation is simple, the automation degree is high, and variable-diameter reaming drilling of any hole expansion rate within 100-300% is realized.

Description

Technical field [0001] The invention relates to a drilling simulation device and method, in particular to a drilling simulation device and method for horizontal well drilling and reaming of structural coal reservoirs for deep structural coal seam horizontal well drilling and reaming research. Background technique [0002] The conditions for the occurrence of coalbed methane resources in China are complex. In the geological history, it has experienced multiple tectonic movements. Coal seams have been deformed strongly, and geological activities such as uplifts, depressions, folds and fractures have occurred in many mining areas. The original structure of coal seams has been destroyed, and coal is soft and coal seams. Soft coal seams or structured coals with poor permeability and disordered bedding are widely distributed. Practice has proved that the existing drainage and pressure-reducing coalbed methane extraction technologies (SVR technology, ECBM technology and their composite ...

AI Technical Summary

Problems solved by technology

However, when reaming, it is necessary to remove the drilling bit and replace it with a reaming bit, and the work efficiency is low

In patent CN206153617U, patent CN2616655Y and patent CN2317305Y, the drilling depth can be controlled, but the diameter of the reaming hole is a fixed value, and the diameter of the reaming hole cannot be changed according to the needs. , cannot expand while drilling

In the patent CN108825275A, the drilling and reaming operation of the drilling tool is driven by adjusting the water pressure, the reaming is stable, the tool is easy to recover, and the reaming diameter can be adjusted while drilling, but the drilling needs to be stopped when reaming , less efficient

In the patent CN109030054A, the simulation device for the directional drilling process of the coal seam can simulate various states during the drilling process of the drill pipe, but it cannot perform hole expansion and diameter reduction

However, most of the above studies focus on the actual production field, and there are few studies on the simulation of the indoor coal and rock drilling process, and basically do not consider the changes in drilling parameters such as rotation speed, torque, and drilling speed during the drilling process.

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