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Self-adapting hybrid bit

A hybrid drill bit and self-adaptive technology, which is applied in the direction of drill bits, drilling equipment, earthwork drilling and production, etc., can solve the problems of inability to adjust the distribution of roller cone drilling pressure and affect the rock-breaking effect of the drill bit, so as to optimize the distribution of rock-breaking volume, The effect of fast speed and wide applicability

Inactive Publication Date: 2014-11-05
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But if the two kinds of drill bits are rigidly connected together, how much drilling pressure will the two kinds of drill bits bear? is unknown
Moreover, it is not possible to adjust the distribution of drilling pressure on the cone and blade according to the lithology of the formation. If these problems cannot be solved, the rock-breaking effect of the drill bit will be greatly affected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] like Figures 1 to 3 As shown, a self-adaptive hybrid drill bit, the end of the drill body 3 is provided with a thread 5 connected to the drill pipe, and the front end is provided with a three-claw type palm 14, and the palm 14 is connected with the cone 1 through a sliding bearing, and can be wound around it. Rotating on its own axis, teeth 10 are inlaid on the cones 1, and there are three blades 13 between the cones 1, and there are diamond composite sheets 11 on the blades 13. The number of cones 1 and blades 13 of the self-adaptive hybrid drill bit is not limited, preferably 2, 3 or 4, as long as the cones 1 and blades 13 are arranged alternately and evenly. Also on the drill bit body 3 is a pressure-balanced device 7 that provides lubricating oil for the bearings. It also includes a movable blade body 2 that is movable in the drill body 3 and can only move back and forth in the axial direction within a limited range. The movable blade body 2 can slide in the drill...

Embodiment 2

[0026] This embodiment is basically the same as Embodiment 1, the difference is that the elastic element is a disc spring.

Embodiment 3

[0028] This embodiment is basically the same as Embodiment 1, the difference is that the elastic element is a rubber spring.

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Abstract

The invention discloses a hybrid bit for petroleum gas exploitation and other exploration drilling applications, wherein cones and blades are simultaneously arranged on a bit main body and are uniformly distributed in a staggering manner, and the cones are arranged on a tooth palm of the bit main body; the hybrid bit further comprises a movable blade body movably arranged in the bit main body and only capable of telescopically moving within a limited range along an axial direction, an elastic element for providing axial force for the movable blade body is also arranged between the movable blade body and the bit main body, the blades are arranged at the front end of the movable blade body, and a compression face for bearing mud pressure is arranged at the tail end of the movable blade body. The self-adapting hybrid bit disclosed by the invention is capable of controlling the relative positions of the cones and the blades in a self-adapting manner according to stress, thereby optimizing the rock breaking quantity distribution of the cones and the blades and guaranteeing a faster rock breaking speed, and the applicability is more extensive. Besides, by the self-adapting design, the rigid impact of common bits and rock stratum is optimized to flexible impact, so that the bit is greatly protected.

Description

technical field [0001] The invention belongs to the field of oil drilling equipment, in particular to a drill bit used in oil and gas exploration and other drilling. Background technique [0002] At present, three-cone drill bits and diamond drill bits (PDC drill bits) are mainly used in oil and gas drilling. The rock-breaking mechanism of the diamond bit (PDC bit) is scraping and rock breaking, so it has the disadvantage of not being suitable for hard formations, interlayer formations with interlaced hardness and softness, and gravel formations under the advantage of fast drilling speed. However, the rock-breaking mechanism of the roller cone bit is crushing and small-displacement scraping. It is characterized in that it can adapt to high-hardness formations and complex formations, but its rock-breaking efficiency is low and the drilling speed is slow. According to the different characteristics of the two drill bits. So people began to develop another form of drill - hybr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/50
Inventor 邓嵘况雨春张云光
Owner SOUTHWEST PETROLEUM UNIV
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