Experimental Research Of Biomimetic Coupling Drilling Pipe Joint And Biomimetic Hardbanding

At present, drilling equipment has been widely used in many fields, and with theincrement of the mining difficulty, it needs higher requirements to ensure safety in themining process. Especially in oil drilling, drilling pipe and the connecting part plays a veryimportant role in the course of their work, which being vulnerable to damage owing to theirrelatively poor working conditions. Therefore, it needs to take protective measures toincrease its life.There are many protective measures in nowadays, whose essences are making drillingpipe joint and shaft wall or casing wall being isolated, and the destruction focuses on theprotection part. This paper mainly studies the thickening outer wall of the drilling pipe jointmeasures and drilling pipe joint hardbanding measures, and use bionics principle toimprove.The first method can make drilling pipe joint have longer working life, but the wearpattern has no change in the working process. Therefore, we use engineering bionicprinciple to deal with the tool joint in this paper, in order to having better properties. Wefabricate bionic coupling units with different size, distribution and shape on the samples’surface of tool joint, and study the properties of the bionic coupling samples.The hardness of samples’ surface can increase with laser processing technology, and itis related to the bionic coupling units. In this paper, we test the abrasive property of thebionic coupling samples by orthogonal experiment, analyze the primary and secondaryfactors of impacting the abrasive property, determine the superior level and collocation, andfind the primary and secondary factors of impacting the abrasive property are shape, sizeand distribution of the bionic coupling units. Under the same conditions, the abrasiveproperty of the grid-shaped bionic sample is best, followed by the stripe-shaped sample, andfinally the dimple-shaped sample. And within the test range, the abrasive property increaseswith the increment of the size and the decrement of the distribution. We observe the wearmorphologies of the samples and analyze the wear mechanism. And we think that there arethree main reasons of bionic coupling surface improving the abrasive property of the sample.Firstly, the bionic coupling units can improve the abrasive property of the base material. Secondly, laser processing strengthens the base material and then improves the abrasiveproperty. Thirdly, bionic coupling structure change the movement pattern of the abrasivegrains, from sliding to rolling, which can reduce scratches and wear furrows.Drilling pipe joint hardbanding technology is used relatively widely, but the researchhas mainly focused on the hardbanding wire recipe. In this paper, we use the weldingmethod to fabricate bionic fiber-reinforced hardbanding with the bionic fiber-reinforcedprinciple, and test the properties of samples by experiments.The surface hardness of bionic fiber reinforced hardbanding with carbon fiber isgenerally higher than ordinary hardbanding, and the hardness increases with the incrementof the carbon fiber content. The abrasive property of bionic fiber reinforced hardbanding isgenerally superior to ordinary hardbanding, and the abrasive property increases with theincrement of the carbon fiber content. We analyze the mechanism of the bionic fiberreinforced hardbanding having better properties. And we think that adding carbon fiber canmake welding layer tissue being tighter, improving hardness and abrasive property. Inaddition, carbon fiber can gradually bugle out from matrix surface in the wearing processand form bionic coupling structure which can improve abrasive property.