Roller cone bit lubrication system with micro positive pressure automatic compensation
An automatic compensation, roller cone bit technology, used in drill bits, drilling equipment, earthwork drilling, etc., can solve the problems of bearing wear, grease surplus, roller cone falling off, etc., to improve service life, improve lubrication performance, and ensure lubrication. effect of effect
Active Publication Date: 2015-09-30
四川保瑞特钻头有限公司
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Problems solved by technology
In field use, many times the roller cone bit fails after being used for less than 90 hours. After testing, it is found that there is a large amount of grease remaining in the oil storage bag, and the bearings are severely worn and even the cones fall off.
Method used
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Embodiment Construction
[0029] The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:
[0030] Such as figure 1As shown, the roller cone bit lubrication system with micro positive pressure automatic compensation includes claw 1 and cone 3, claw 1 is provided with journal 4, cone 3 is installed on journal 4 through bearing 5, and cone 3 A sealing ring A6 is provided between the inner hole port and the journal 4 to form a bearing chamber, the claw 1 is provided with an oil passage 7 connected to the bearing chamber, the claw 1 is provided with a mud passage 8, and the lower part of the claw 1 is provided with The nozzle connected to the mud passage 8, the upper part of the claw 1 is provided with an oil storage bag hole 9, and an oil storage bag 10 is arranged in the oil storage bag hole 9, and the end of the oil storage bag 10 close to the port of the oil storage bag hole 9 is connected ...
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The invention discloses a micro-positive pressure auto-compensation rock bit lubricating system which comprises a tooth claw (1) and a tooth wheel (3). A slurry channel (8) is arranged in the tooth claw (1), an oil storage bag hole (9) is arranged on the upper portion of the tooth claw (1), an oil storage bag (10) is arranged in the oil storage bag hole (9) and is internally communicated with an oil passing channel (7) through an oil duct, and a compensation cavity (14) is communicated with the slurry channel (8) through a pressure leading hole (15). The micro-positive pressure auto-compensation rock bit lubricating system has the advantages that pressure of slurry in a bit serves as driving force of the auto-compensation rock bit lubricating system, the pressure leading hole cannot be blocked easily, service life of the rock bit is prolonged; pressure of slurry in the rock bit serves as compensation lubrication power and is larger than annulus pressure, pressure differential of the lubricating system is remarkably increased, and micro-positive pressure auto-compensation is achieved; a roll ball and a spring are arranged, pressure drop is formed, counter flow of the slurry is avoided, stability of the driving force is enhanced, and lubricating efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of oil and gas drilling equipment, in particular to a roller cone bit lubrication system with micro positive pressure automatic compensation. Background technique [0002] The drill bit is a tool that directly contacts the rock during the drilling process and breaks the rock through cutting and punching. [0003] 1. The status quo of the lubrication compensation system. Existing roller cone bits are equipped with an oil storage compensation system in order to cope with harsh downhole working conditions, especially the bottomhole high pressure created by drilling fluid. The task of this system is to ensure that the bearings and sealing rings have good working conditions, thereby prolonging their life. Field survey data show that the service life of existing roller cone bit bearings is almost directly dependent on the service life of the sealing ring used. The life and sealing quality of the sealing ring ar...
Claims
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IPC IPC(8): E21B10/24
Inventor 田家林杨志
Owner 四川保瑞特钻头有限公司