Downhole dual-power device
A dual power, transmission shaft technology
Active Publication Date: 2017-08-04
ORIENT ENERGY & TECH CO LTD
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Problems solved by technology
[0003] During the drilling process of the drill bit, since the closer the drill bit is to the rotation center, the linear velocity is smaller, and the farther away from the center position, the linear velocity is greater, resulting in greater wear at the position farther away from the center, and the outer diameter of the drill bit is getting larger due to wear. The smaller the diameter, the final result is that the drilled wellbore cannot meet the requirements due to the small radial dimension or the drill bit needs to be replaced frequently to ensure that a sufficiently large wellbore is drilled
Method used
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[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] Such as figure 1 and figure 2 As shown, the embodiment of the present invention discloses a downhole dual power device for rock-breaking drilling. Two drill rods 50 , a first drill bit 60 and a second drill bit 70 . The stator case 10 is in the shape of a long tube. The stator case 10 can be made of a long tube, or can be formed by butting a plurality of short tubes. In this embodiment, the stator case 10 is formed by butting a plurality of short tubes. The first rotor 20 is rotatably arranged in the stator housing 10, and the first rotor 20 and the stator housing 10 enclose the first spiral channel 21, so that the first rotor 20 and the stator housing 10 form a screw motor, when the drilling fluid When passing through...
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The invention discloses a downhole dual-power device which comprises a stator shell, a first rotor, a second rotor, a first drill rod, a second drill rod, a first drill bit and a second drill bit, wherein a first spiral channel is formed between the first rotor and the stator shell; a second spiral channel is formed between the second rotor and the stator shell; the first drill rod is rotated along with the first rotor; the second drill rod is rotated along with the second rotor; the first drill rod penetrates through the second drill rod; the head of the first drill rod protrudes out of the head of the second drill rod; the first drill bit is assembled on the head of the first drill rod; the second drill bit is assembled on the head of the second drill rod; and when drilling fluid passes through the first spiral channel and the second spiral channel, the first rotor and the second rotor can form differential rotation. According to the device disclosed by the invention, drilling is performed by utilizing the two coaxial drill bits which do not interfere with each other during rotation, the drilling progress is accelerated, and synchronous wear of the two drill bits is realized by utilizing differential motion of the two drill bits.
Description
technical field [0001] The invention relates to the technical field of drilling, in particular to a downhole dual power device. Background technique [0002] The downhole power unit (or screw drilling tool) in the prior art uses the drill bit installed on the drill pipe head to perform rock-breaking drilling (the rotational power of the drill bit is provided by the screw motor, that is, the rotor and stator connected to the drill pipe The casing forms a helical channel through which the drilling fluid forces the rotor to rotate). [0003] During the drilling process of the drill bit, since the closer the drill bit is to the rotation center, the linear velocity is smaller, and the farther away from the center position, the linear velocity is greater, resulting in greater wear at the position farther away from the center, and the outer diameter of the drill bit is getting larger due to wear. The smaller the diameter, the eventually the drilled wellbore cannot meet the require...
Claims
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IPC IPC(8): E21B4/02
CPCE21B4/02
Inventor 尹永清尹永奇秦超王曦远刘立江
Owner ORIENT ENERGY & TECH CO LTD