Abstract
PDC (polycrystalline diamond compact) bit is the key equipment for drilling holes inside the rock in oil and mining industry. Inspired by the shape and structure of Capra sibirica horn, a bionic lateral PDC reamer bit with variable lateral reaming radius was developed. Side view of Capra sibirica horn was employed for fitting the horn shape curve based on picture processing method. PDC teeth were arranged on the horn shape blade imitating the transverse ridges on the horn to cut the rock material, found with only 30% utilization rate of the total teeth and load concentration of the last tooth. A bionic blade curve evolved from the Capra sibirica horn was defined with geometric method for the lateral reamer bit; the utilization rate of the teeth on the bionic blade curve was improved to 90% with uniformly distributed reaming load. Multigroup simulations were conducted with the finite element method; the effects of bit revolution speed and rotation feed speed of the bionic blade to reaming load were emphatically studied. Concrete sample was reamed indoors from 240 mm to 407 mm in diameter, and the bionic lateral PDC reamer bit was approved by the test result.
Highlights
Drilling is an important procedure in oil and mining industry; the hole inside the rocks is drilled mostly by the PDC bit, which has a market share of about 85% [1]
The reaming load of the bionic lateral PDC reamer bit were studied with the finite element method and further with a prototype and concrete samples
In order to get the curve of the horn, side view of the Capra sibirica horn in Figure 1(b) has been used for extracting the profile and further fitting a horn shape blade curve based on image processing technology [17, 18]
Summary
Drilling is an important procedure in oil and mining industry; the hole inside the rocks is drilled mostly by the PDC bit, which has a market share of about 85% [1]. The shape and diameter of the holes drilled inside the rock are directly determined by the bit blades and teeth on them. A type of drill bit for foundation stake in the civil engineering of rocky area is constructed with a metamorphic triangle blade; the hole with a cone shape for the stake can be reamed laterally by the teeth on the hypotenuse of triangle blades [7]. The PDC bit with metamorphic blades variably cutting position of the teeth is feasible to expand the research and application of the drilling bit. Inspired by the shape of horn and transverse ridges structure on it, a bionic blade for the lateral PDC reamer bit was proposed obeying the basic PDC bit technology [14]. The reaming load of the bionic lateral PDC reamer bit were studied with the finite element method and further with a prototype and concrete samples
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
