Miniature roller bit suitable for indoor micro-drilling test in oil and gas drilling industry

Abstract

The invention provides a miniature roller bit suitable for an indoor micro-drilling test in the oil and gas drilling industry. The technical problems of well bottom mode change, low effective drilling depth, large test data error and rock core waste of a miniature roller bit in the prior art are solved. The miniature roller bit comprises a drill bit seat (1), and the drilling face of the drill bit seat (1) is composed of an inclined face (8) and a horizontal face (9); a roller shaft (5) is fixed on the inclined face (8), the roller shaft (5) is perpendicular to the inclined face (8), and a roller is mounted on the roller shaft (5); and a lengthening rod (3) is fixed on the horizontal face (9), and gauge protection teeth (4) are connected to the lengthening rod (3). According to the miniature roller bit, the roller ensures that the well bottom is always a horizontal face, and the gauge protection teeth (4) ensure that the diameter of a well bottom broken pit is not changed in the drilling process, so that continuous drilling on one rock core is realized, invalid drilling is reduced, rock core waste is avoided, and the indoor micro-drilling test efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of rock drillability evaluation tests in oil and natural gas, in particular to a micro-cone bit suitable for indoor micro-drilling tests in the oil and gas drilling industry. Background technique [0002] In the process of oil and natural gas development, the drilling process of drilling a wellbore is the link with the largest investment and the longest time. Drillability test to guide bit selection; the current drillability test is carried out in accordance with the national standard "SY / T5426-2016: Determination and Classification of Drillability of Oil and Gas Drilling Engineering Rocks"; Drill bit, laminated double-cone micro-drill bit is composed of 8 blades and 9 gaskets worn on the drill body by the blade shaft and laminated. The surface of the cylinder rock sample with a diameter of 50 mm and a height of 50 mm was drilled 2.4 mm, and the rock drillability was calculated according to the drilling tim...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a micro-cone bit suitable for indoor micro-drilling tests in the oil and gas drilling industry, to solve the problems of the micro-cone bit in the prior art, such as the change of the bottom hole mode, the low effective drilling depth, the large error of the test data and the Technical Problems of Core Waste

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