Stratum fracture length real-time prediction method based on kernel SMO algorithm

Abstract

The embodiment of the invention provides a stratum fracture length real-time prediction method based on a kernel SMO algorithm, and belongs to the field of data mining and the field of drilling fluidleaking stoppage. The method comprises the steps: collecting historical drilling data, historical drilling crack length true values and real-time drilling data of a target block, and carrying out datapreprocessing; dividing the preprocessed historical drilling data into a training set and a test set, and determining the iteration number M and an allowable error e of a kernel SMO sensor in advance; generating parameter vectors by utilizing various parameters related to the crack length, initializing all the parameter vectors, and calculating a kernel matrix of the parameter vectors; generatinga new perceptron model according to the parameter vector, the kernel matrix, the number of iterations and the allowable error, testing the new model through the data of the test set, and regeneratinga model if the test result does not meet the precision requirement; and predicting the real-time drilling data by utilizing the new model meeting the precision requirement so as to achieve the effectof predicting the stratum fracture length in real time.

Description

technical field [0001] The invention relates to a method for real-time prediction of formation fracture length based on a nuclear SMO algorithm, which belongs to the field of data mining and the field of drilling fluid loss plugging. Background technique [0002] Lost circulation is one of the most serious complex situations that affect the safety of drilling operations. Lost circulation not only brings great difficulties to drilling engineering, but also seriously affects the development speed of oil and gas resources. Although my country's plugging technology is becoming more and more mature, the plugging effect is not ideal. Most oil wells have a plugging success rate of less than 30% after the occurrence of lost circulation, and repeated oil wells are extremely frequent. Whether it is the low plugging success rate or the frequent repeated leakage, it is largely due to the fact that the fracture length cannot be judged in advance. The unknown fracture length will make it...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main methods for measuring the length of fractures in my country: (1) Judging the length of underground fractures based on numerical simulation methods. This method is only applicable to some areas with uncomplicated geological structures. In complex situations, the accuracy rate will be seriously inaccurate; (2) Using imaging logging technology to judge the fracture length, although this method has high accuracy and strong practicability, the imaging logging process is complicated and expensive to measure, and a long well section measurement It will cost hundreds of thousands or even millions of RMB, so it is difficult to popularize

Images