The rate of penetration
(ROP) is an index used to measure drilling
efficiency. However, it is restricted by many factors, and there is
a coupling relationship among them. In this study, the random forest
algorithm is used to sort influencing factors in order of feature
importance. In this way, less influential factors can be removed.
A fuzzy neural network (FNN) is applied to the field of drilling engineering
for the first time, aiming at the coupling problem to predict the
ROP. Fuzzification is an important part of training and realizing
FNN, but research on this topic is currently lacking. In this study,
K-means are used to divide the data with high similarity into a fuzzy
set, which is used as the initialization parameter for the second
layer of the FNN. The data of Shunbei No. 1 and 5 fault zones in Xinjiang
are collected and trained. The results show that the mean value of
the coefficient of determination R
2 is
0.9668 under 10 experiments, which is higher than those obtained from
a back propagation neural network and multilayer perceptron particle
swarm optimization methods. Therefore, the effectiveness and feasibility
of the model are verified. The proposed model can improve drilling
efficiency and save drilling costs.