Abstract
A roller bit is a drilling tool widely used in oil and gas exploitation. The roller bit is applied to cutting the rock stratum, and its working life and rotational speed are important factors affecting the drilling efficiency. Moreover, a bearing sealing affects the working life and rotational speed of a bit. This paper proposes a helical sealing structure that addresses the problems of severe sealing wear and a short working life. This structure has been used in many engineering fields but was first applied to the roller bit. This paper investigates the sand removal mechanism of helical sealing through simulation and experiment. Additionally, helical sealing parameters were optimized. The optimum structural parameters of helical sealing in a high-speed roller bit were obtained. It was shown that the helical sealing structure can be applied to a roller bit with good effects of sealing and sand removal.
Highlights
The roller bit is the tool most widely used in petroleum and geological drilling.the roller bit has the functions of impacting, crushing, and cutting the rock stratum and can adapt to soft, medium, and hard strata
According to the literature on helical sealing and the optimized helical structure parameters with better pumping performance, the helical sealing structure is preliminarily determined by combining the size of the roller bit with the specific working conditions
Results show that the velocity direction from the top to bottom of the sealing end can achieve good sand removal performance
Summary
The roller bit is the tool most widely used in petroleum and geological drilling.the roller bit has the functions of impacting, crushing, and cutting the rock stratum and can adapt to soft, medium, and hard strata. The roller bit is the tool most widely used in petroleum and geological drilling. The development of long-life high-speed cone bits has become an important technical issue, which urgently needs to be addressed in petroleum drilling engineering. Improving the bit drilling speed and working life are effective ways of reducing the drilling cost. The sealing affects the bit drilling speed and working life and is the weakest part of the bit. Field data have shown that the failure rate of roller bits due to early bearing damage is as high as 80%, and bearings seriously worn by early sealing failure account for 30% of all failed bearings [1–8]. The sealing has become a technical bottleneck that seriously affects the drilling efficiency and cost. There is an urgent need for a solution to this problem in petroleum engineering
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