Downhole casing drilling device of oil well
A drilling device and casing technology, applied in drilling equipment and methods, drilling equipment, earthwork drilling and production, etc., can solve the problems of high cost, poor reliability, complicated operation, etc., and achieve the effect of simple method, practical and reliable
Inactive Publication Date: 2014-04-16
CNPC GREATWALL DRILLING ENG
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Problems solved by technology
It overcomes the disadvantages of complex operation, high cost and poor reliability in the prior art
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[0008] As shown in the accompanying drawings, an oil well downhole casing drill includes an outer pipe 1, a hydraulic motor 2, a motor support frame 3, a drill bit 11 and a main body 18. The outer pipe 1 is welded with a motor support frame 3, and the motor support frame 3 is fixed with a hydraulic motor 2; the lower end of the hydraulic motor 2 is connected to the connecting shaft 5 through the reducing joint 4, and the connecting shaft 5 is provided with a nut 6, a bearing 7 and a compression sleeve 8, and the main body 18 is connected to the inner wall of the lower end of the outer tube 1, The outer sides of the compression sleeve 8 are all connected to form a sealed chamber in the middle of the main body 18, the lower end of the connecting shaft 5 is connected to the small bevel gear 9, the small bevel gear 9 meshes with the large bevel gear 10, the large bevel gear 10 is keyed to the drill bit 11, and the drill bit 11. The rear end is connected to the drill bit piston 12. ...
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The invention relates to the technical field of a radial horizontal well with ultra-short radius, and in particular relates to a downhole casing drilling device of an oil well; the lower end of a hydraulic motor of the drilling device is connected with a connecting shaft by a reducer union; the connecting shaft is sheathed with a nut, a bearing and a compression sleeve; a main body is connected with the inner wall at the lower end of an outer tube and the outer side of the compression sleeve respectively, so that a sealing chamber is formed in the middle of the main body; the lower end of the connecting shaft is connected with a bevel pinion which is meshed with a big bevel gear; the big bevel gear is connected with a drill bit by a key; the rear end of the drill bit is connected with a drill bit piston; the drill bit and the drill bit piston are arranged in the sealing chamber arranged in the middle of the main body; the main body is provided with a piston driving pressure pipeline and a drilling cuttings cleaning pipeline; the piston driving pressure pipeline is communicated with the position of the drill bit piston arranged in the sealing chamber; the drilling cuttings cleaning pipeline is communicated with the position of the drill bit arranged in the sealing chamber; and the lower end of the main body is connected with a directional key. According to the downhole casing drilling device, the steps of forging and milling a casing and reaming a borehole are omitted, radial drilling can be directly carried out in the downhole casing, operation is simple and reliable and cost is low.
Description
Technical field: [0001] The invention relates to the technical field of ultra-short radius radial horizontal wells, in particular to a downhole casing drill for oil wells. Background technique: [0002] Ultra-short radius radial horizontal well technology can directly drill multiple 30-50-meter-long production channels in the reservoir, effectively increasing the oil drainage area. This technology requires drilling pilot holes in the radial direction of the downhole casing , and can ensure high-quality hole wall and guide hole direction, creating conditions for subsequent further formation drilling construction. At present, the patent 03239019.x in the prior art adopts forging and milling the casing, reaming the wellbore, and finally running the casing to complete the well, which makes the drilling cost very high and requires a large diameter of reaming, but in hard Reaming in formations and deep wells is limited, so the application and promotion are limited. What the pate...
Claims
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IPC IPC(8): E21B7/00
Inventor 施连海钟富林杨帆黄志强刘平全
Owner CNPC GREATWALL DRILLING ENG