A Downhole Tool with Reduced Friction and Increased Amplitude
A downhole tool and friction reduction technology, applied in the direction of drilling with vibration, can solve the problems of prolonged drilling cycle, reduced mechanical speed, limited length of horizontal section, etc. Effect
Inactive Publication Date: 2016-04-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
The horizontal section feeding bears such frictional resistance, which will limit the length of the horizontal section drilled, reduce the mechanical speed, and prolong the drilling cycle
Method used
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[0008] according to figure 1 As shown, in the working process of the present invention, the mud enters the stator 8 through the mandrel 14 and the flushing pipe 12, and the mud drives the rotor 7 to rotate in the stator 8, that is, the internal mud pressure can drive the rotor 7 to drive the bypass valve and the dynamic valve. The valve plates 5 rotate together. After the mud passes through the stator and rotor, it passes through the inclined holes on the side of the bypass valve 6, and the two inclined holes reduce the pressure loss when the mud enters the inner cavity of the bypass valve 6; There is a certain distance from the center, and the mud flows into the side hole of the moving valve plate 5, wherein the chamfer on the moving valve plate can reduce the pressure loss of the mud; below is a static valve plate 4 with a center hole, which passes through the end face of the lower joint 1 and the cartridge 3 for axial positioning, and threaded connection between the cartri...
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The invention provides a friction-reduction and amplitude-increasing downhole tool used in the field of petroleum and gas drilling, geological drilling and the like. The problem that frictional resistance and vibration affect an upper drill stem in a drilling process can be solved. According to the technical scheme, a lower joint is connected with an outer barrel and is connected with a clamping barrel so that a static valve plate is fixed; a movable valve block is in interference connection with a bypass valve; the bypass valve is connected with a rotor by using a spline; the rotor is placed in a stator; a check valve is arranged at the upper end of the rotor and is fixed through a snap ring and a step; a stator barrel is connected with a disc spring outer barrel; a washing pipe is arranged in the dish spring outer barrel and is connected with a mandrel; a disc spring is arranged on the mandrel and is fixed between the washing pipe and a gasket; the disc spring outer barrel is connected with a spline body; the spline body is connected with the mandrel by using a spline; and the upper portion of the mandrel is connected with a drill pipe. The friction-reduction and amplitude-increasing downhole tool has the advantages that friction and resistance are reduced, the amplitude is increased, the service life is prolonged, the mechanical drilling speed is increased, and influence of vibration on the upper drilling stem is reduced.
Description
technical field [0001] The invention relates to a friction-reducing and amplitude-increasing downhole tool for drilling extended-reach wells or horizontal wells. Background technique [0002] Extended reach wells are a comprehensive embodiment of directional wells, horizontal wells, deep wells and other technologies. Combining the application of horizontal well technology not only greatly improves single well production and oil and gas field recovery, reduces oil and gas development costs, but is also a powerful means of development. Since the self-weight of the horizontal section being drilled will press against the well wall, a large frictional resistance will be generated between the pipe string and the wellbore, and the longer the horizontal section is, the greater the frictional resistance during drilling will be. The horizontal section feeding bears such frictional resistance, which will limit the length of the drilling horizontal section, reduce the mechanical speed,...
Claims
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IPC IPC(8): E21B7/24
Inventor 田家林李友庞小林杨琳朱永豪付传红
Owner SOUTHWEST PETROLEUM UNIV