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

A technology for oil and gas drilling and roller cone bits, which is applied in drill bits, drilling equipment, earth-moving drilling, etc., and can solve the problems of core waste, bottom hole pattern change, and low effective drilling depth.

CN113187406AActive Publication Date: 2021-07-30SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-07-30

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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.
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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...

Examples

Embodiment Construction

[0022] Such as Figure 1-Figure 4 As shown, a micro-cone bit suitable for indoor micro-drilling tests in the oil and gas drilling industry includes a bit seat 1, which is a cylinder with an appropriate diameter and height, and the drilling surface of the bit seat 1 is composed of an inclined surface 8 Constituted with a horizontal plane 9; a cone shaft 5 is fixed on the inclined plane 8, and the cone shaft 5 is perpendicular to the inclined plane 8, and a cone is installed on the cone shaft 5; an extension rod 3 is fixed on the horizontal plane 9, The extension rod 3 is connected with a gauge tooth 4, and the gauge tooth 4 is processed and formed using an alloy material with high hardness and high wear resistance. The diameter does not change.

[0023] As an optional embodiment, the cone includes four cutting blades 7 with unequal cutting radii, and the cutting blades 7 are all installed on the cone shaft 5, and the cutting blades 7 are laminated, which is convenient for the ...