Controllable variable-diameter drill bit

A drill bit and drill body technology, which is applied in the field of controllable variable diameter drill bits, can solve problems such as drill pipe stick-slip, stable working bit jamming, and small drill bits in cementing annulus, so as to reduce sticking, reduce drilling operation costs, The effect of overcoming the resistance of rock formations

Active Publication Date: 2020-12-29
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned problems, the present invention provides a controllable variable-diameter drill bit to realize the expansion and contraction of the drill bit blade during the drilling process, which can continuously change the diameter, and can perform self-locking of the blade after completing the diameter-changing process, thereby It solves the working stability problem of the existing variable diameter drill bit after the diameter change is completed, as well as the drilling problems such as bit jamming, small cementing annulus, and bit falling off and sticking of the drill pipe during the drilling process using conventional drill bits.

Method used

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  • Controllable variable-diameter drill bit

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Effect test

Embodiment 1

[0041] When the drill bit is worn out with the rock formation during the drilling process, the drill bit becomes smaller and smaller, resulting in a smaller diameter of the drilled hole, which makes it difficult to run in the hole, resulting in the need for a short trip in the middle of the hole, and correcting the hole to prevent jamming. ;The flow of drilling fluid into the pressurized sliding sleeve (2) can be appropriately increased to drive the pressurized sliding sleeve (2) to push the locking sliding sleeve (4), thrust bearing (5) and connector (7) to move downward and compress When the spring (9) and the connector (7) move downward, they will push the connecting rod (8) to drive the combination blade to expand slightly outward, so as to complete the small diameter change of the drill bit to compensate for the radial change caused by the wear of the drill bit. The size is reduced to correct the hole diameter, thereby avoiding the problem of bit sticking caused by the red...

Embodiment 2

[0043] During the drilling construction process, limited by factors such as well depth, formation pressure and casing layer number and diameter, the diameter of the wellbore drilled by a conventional drilling bit with a fixed diameter cannot meet the annular gap required for casing cementing. It can increase the flow of drilling fluid into the pressurized sliding sleeve (2), and drive the pressurized sliding sleeve (2) to push the locking sliding sleeve (4), thrust bearing (5) and connector (7) to move down the compression spring ( 9), when the connector (7) moves downward, it will push the connecting rod (8) to drive the combined blade to expand outward, so as to implement the diameter reduction of the drill bit. When the pressurized sliding sleeve (2) pushes the locking sliding sleeve ( 4) After sliding out of the guide groove, because the locking slideway (403) on the upper end of the self-locking column (401) only touches half of the inclined surface of the V-shaped locking...

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Abstract

The invention discloses a controllable variable-diameter drill bit. The controllable variable-diameter drill bit is mainly composed of an upper connector, a drill body, combined blades, a pressurizingsliding sleeve, a self-locking mechanism and a telescopic mechanism. The upper connector is connected with the drill body, the telescopic combined blades and a drill bit water hole are formed in thelower part of the drill body, the pressurizing sliding sleeve is arranged in the drill bit, a locking sliding sleeve used for self-locking is arranged below the pressurizing sliding sleeve, and a thrust bearing and a spring are arranged below the locking sliding sleeve. According to the controllable variable-diameter drill bit, the expansion and contraction of the combined blades and the self-locking of the combined blades are controlled by controlling the flow of drilling fluid, and the diameter can be continuously changed, so that the drill bit running into a small casing drills out a largeborehole; and the reasonable annular gap of well cementation is ensured, the problems of drill bit jamming caused by water absorption necking or plastic necking during drilling of a stratum prone to necking and the working stability of the blades after diameter variation of the drill bit are solved, so that production time efficiency is improved, and drilling cost is reduced.

Description

technical field [0001] The invention relates to an oil and gas drilling tool, in particular to a controllable variable-diameter drill bit. Background technique [0002] In recent years, with the continuous development and improvement of oil and gas drilling and production technology, in the process of onshore and offshore oil and gas drilling and production, the wellbore formed by drilling is often encountered due to the compression of the formation and other reasons. Difficult to continue, enlarging borehole diameter has become an important means to solve complex deep well stuck, improve casing program, improve cementing quality and reduce drilling cost. The existing drill bits are all fixed outer diameters, which mainly have the following drilling problems: [0003] (1) A drill bit with a fixed outer diameter is used. Due to the wear between the drill bit and the rock formation during the drilling process, the drill bit will become smaller and smaller, resulting in a grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/32E21B10/60
CPCE21B10/322E21B10/60
Inventor 唐洋倪申童王国荣姚佳鑫刘清友赵鹏王金忠李泽良赵金海熊浩宇敬常润杨鑫刘祥吴杰王远
Owner SOUTHWEST PETROLEUM UNIV
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