Vibration reducing and speed increasing device
A vibration damping shaft and cross-flow technology, applied in drilling with liquid/gas jets, etc., can solve the problems of drill string vibration, affecting the life of drill string and drill bit, etc. big effect
Inactive Publication Date: 2015-06-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
When the drill string is working underground, the force condition and the working environment are extremely harsh, so it is easy to cause the vibration of the drill string, which seriously affects the life of the drill string and the drill bit
Method used
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Embodiment Construction
[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0028] The present invention starts from the idea of reducing vibration of the drill string and increasing the ROP, cleverly combines the two, and designs a vibration reducing and speed-increasing device integrating the vibration reduction of the drill string and the abrasive jet flow at the bottom of the well. Make full use of the longitudinal vibration of the drill string and convert it into the lower abrasive pulse jet. The vibration reduction and speed-increasing device of the present invention can increase the drilling speed while eliminating or reducing the longitudinal vibration of the drill string, prolong the life of the drill string and reduce the drilling cost.
[002...
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The invention discloses a vibration reducing and speed increasing device. The vibration reducing and speed increasing device comprises a vibration reducing shaft, wherein the upper end of the vibration reducing shaft is connected with a conversion joint; an upper joint and shell coat the external of the vibration reducing shaft in sequence; a lower joint is connected below the shell; a cross-flow valve is mounted between the shell and the vibration reducing shaft; a mixed-flow valve and a nozzle are mounted in the lower joint; and the mixed-flow valve is positioned above a nozzle. The vibration reducing and speed increasing device, provided by the invention, has the advantages of simple structure, short length, convenience for connection and use and few wearing parts, can adapt to various stratums, increases the drilling speed under the condition of not influencing normal drilling, prolongs the service life of a drill rod and a drill bit, provides an effective path for shortening the drilling period and reducing the drilling cost, and has excellent field application prospect. Meanwhile, annular rock cuttiugs can be guided into the vibration reducing and speed increasing device to form abrasive jet flow, so that the rock threshold bit weight is reduced, the mechanical drilling speed is increased, and the utilization rate of underground energy is improved.
Description
technical field [0001] The invention relates to a drilling vibration reducing and speed increasing device in the field of oil and gas exploration and development, in particular to a vibration reducing and speed increasing device for oil drilling. Background technique [0002] As the wells drilled in the field of petroleum exploration and development become deeper and deeper, the stratum becomes harder and harder, and the lithology and hardness of the stratum become more and more complicated. When drilling such formations, there will be problems such as low ROP, strong drill string vibration, long drilling cycle and high drilling cost. For this reason, improving the ROP and shortening the drilling cycle are the goals that drilling engineers have been pursuing. When the drill string is working underground, the force condition and the working environment are extremely bad, so it is very easy to cause the vibration of the drill string, which seriously affects the life of the dr...
Claims
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IPC IPC(8): E21B7/18
CPCE21B7/18
Inventor 宋洵成李同同许海超陆桃妹赵振宇刘永旺
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)