Core drill suitable for hard fractured formation

Abstract

The invention provides a core drill suitable for hard fractured formation. The core drill comprises a core bit, a drill rod, an outer pipe, an inner pipe, a righting block and a bearing portion. The drill rod is connected to the upper portion of the outer pipe, the lower portion of the outer pipe is connected with the core bit, the righting block is arranged on the inner wall of the lower side ofthe outer pipe, the bearing portion is arranged between the inner pipe and the outer pipe, the inner pipe is composed of multiple pipe barrels, the pipe barrels are connected through threads, multipleaxially-symmetric grooves are evenly distributed in the inner wall of each pipe barrel, a core locking mechanism is arranged on each groove, and comprises a springback part, a shaft hole and a core locking plate, the springback parts are arranged on the grooves, the core locking plates are connected with the springback parts through the shaft holes, the core locking plates are in fan shapes, theshaft holes are formed in the two ends of the outer edge of each fan shape, the parts, close to the circle centers, of the fan shapes are arc shapes, tooth-shaped tip teeth are arranged on the arc sides, the multiple core locking plates are arranged, and the core locking plates are spliced to a core locking ring of a split structure. The coring success rate of the fractured formation can be obviously improved, the well drilling coring efficiency is improved, and the coring cost is reduced.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a drilling device suitable for hard and broken formations. Background technique [0002] While traditional energy reserves continue to decrease, environmental problems have become more acute; countries have begun to mine new energy sources, including new energy sources such as solar energy, geothermal energy, wind energy, and biomass energy; hot dry rocks are clean and renewable Energy is the most potential part of geothermal energy, and it is the future of geothermal energy. In terms of distribution, hot dry rock resources are the same as shallow geothermal energy, and are widely distributed resources. However, compared with shallow geothermal energy, hot dry rock is less affected by external conditions such as climate; in terms of resource quality, Hot dry rock resources are mainly used for power generation, which can meet the fundamental energy needs of the cou...

AI Technical Summary

Problems solved by technology

The failure of coring operation will lead to the loss of geological data and the inability to directly understand the underground situation objectively, resulting in slow progress of engineering operations and loss of formation information, which will increase the cost of drilling operations and affect geological understanding

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