Core drill output torque upper control limit drill rod

Abstract

Disclosed is a core drill output torque upper control limit drill rod. The core drill output torque upper control limit drill rod comprises a core pipe, a joint is arranged on the upper portion of the core pipe, a rotating sleeve sleeves the middle of the core pipe, a torque transmission bar is disposed between the rotating sleeve and the core pipe, and a ring of circular arc groove which is used for disconnection when the core drill output torque is larger than the maximum bearing torque of a downhole drill rod is designed in the middle of the torque transmission bar. By means of the circular arc groove in the middle of the torque transmission bar, a torque transmission relation between a core drill active drill rod and the downhole drill rod is disconnected when the core drill output torque is larger than the maximum bearing torque of the downhole drill rod, the core drill active drill rod continues to rotate and the downhole drill rod stops rotating, and thereby, bearing torque overload protection of the downhole drill rod can be achieved. The core drill output torque upper control limit drill rod has the advantages that the weight is small, the structure is simple, assembly and disassembly are convenient, downhole drill rod breaking accidents caused by excessively large drill output torque can be effectively avoided, the construction costs are lowered, and the core drill output torque upper control limit drill rod is applicable to deep hole geological exploration engineering.

Description

technical field [0001] The invention relates to geological exploration equipment, in particular to a drilling rod for controlling the output torque upper limit of a core drilling rig. Background technique [0002] With the rapid implementation and development of the national "Twelfth Five-Year" geological survey project and the "358" action plan for geological prospecting, drilling projects have drilled into deeper strata, more complex strata, and in unknown or newly discovered geological areas. Advance in the direction of development. The mature development of 2000-meter deep-hole drilling technology equipment has been widely used in geological prospecting construction. With the continuous increase of hole depth, the required equipment models are also constantly updated, and drilling models with greater power Equipment is being continuously applied to the market, and drill pipe, as a high-cost consumption medium, plays a vital role in engineering operations. Because the ty...

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Problems solved by technology

Compared with the rated maximum torque that traditional ordinary drill pipes and wireline coring drill pipes can withstand, especially the maximum output torque of models above 2,000 meters has exceeded the rated maximum torque that the matching bottomhole drill pipe can withstand, so The bottom hole drill pipe is prone to breakage accidents; sometimes when the drilling rig is working normally, an abnormal situation will suddenly occur. The rated maximum torque to withstand, which is easy to cause the breakage accident of the bottom hole drill pipe

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