Deep hole processing is the processing of holes having a hole depth to diameter ratio of 5 or more. In the machining industry, the processing of holes is relatively large, but the service life of the drill bit and the quality of the machined holes are difficult to guarantee in the processing of deep holes. Improving the service life and processing efficiency of the drill bit is the research direction of hole machining. On the one hand, deep hole machining should select a suitable drill bit to improve the processing quality. On the other hand, to choose the right lubrication system, the ideal lubrication method can improve the life of the cutting tool and the surface quality of the workpiece.
Tubing is mainly used to provide oil and gas flow passage during production of oil and gas wells. For flowing wells, due to the large inner diameter of the CASING, the casing is directly used for production. Due to the density difference, pressure drop and expansion, the liquid flows up rapidly, causing the liquid to slip, resulting in the ineffective utilization of the downhole elastic energy. Running tubing with smaller OD and ID during production can effectively solve the above problems by allowing fluid to flow in the tubing. Therefore, running tubing is required during production of flowing wells. The downhole operation and production of flowing well and non flowing well can be completed by using various tools for tubing running.
The basic requirements of the tubing used for workover are: to comply with the safety and economic principles, to meet the technical requirements adopted during well completion, and to meet the requirements for corrosion resistance and operation measures after the well is put into production.
According to the manufacturing process, oil pipes can be divided into seamless pipes and electric welded pipes. Seamless pipe is a kind of forged steel pipe without welding seam, which is made of hot working steel. After pressing, stretching, heat treatment and other processes, it reaches the standard size of oil pipe, forming a seamless oil pipe series. Electric welding pipe is a kind of pipe with a longitudinal weld formed by resistance welding or electric induction welding without filler metal. The welding edges are squeezed together by mechanical pressure, and the standard size oil pipes are reached through heat treatment and other processes, forming a series of electric welding pipes.
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In deep hole drilling, traditional lubrication techniques use a large amount of cutting fluid to achieve lubrication and cooling. This type of lubrication requires a large amount of cutting fluid, and the cutting fluid is sprayed onto the equipment and work site for the environment and the body. Will have an adverse effect. In the cutting process, it is difficult to reach the machining action surface by using high-pressure cutting fluid, and the cooling and lubrication effects are greatly reduced. The recycling and disposal costs of the cooling waste liquid are also getting higher and higher, and the problem of the lubrication method of the cutting fluid is more prominent. Oil mist micro-lubrication cooling method is suitable for new processing, which can avoid the problem of waste oil recovery and pollution. At the same time, the reliable lubrication effect improves the surface quality and prolongs the service life of the drill bit.
The drill bit with the inner cold hole appears, and the use of oil mist lubrication makes the oil mist deep hole drilling process more reliable. The adaptive solution also enables the deep hole drilling micro-lubrication technology to play a better role. The deep hole drilling micro-lubrication system has been widely used in crankshaft oil holes and engine casings in the field of automotive machining.