公开(公告)号：US20240044247A1

公开(公告)日：2024-02-08

申请号：US17881648

申请日：2022-08-05

Applicant: Southwest Petroleum University

Inventor： Haibo LIANG ,  Hai YANG ,  Zhongbing LI ,  Pengbo NI ,  Jialing ZOU ,  Yi ZHANG

IPC: E21B49/00

CPC classification number: E21B49/005 ,  E21B2200/20 ,  E21B2200/22

Abstract: A method for detecting a borehole caving based on cuttings and elements logging data includes: integrating real-time elements logging data and real-time cuttings return data of a target well, and historical elements logging data and stratum evaluation data of an adjacent well; calculating a root mean square deviation (RMSD) Δ of a relative content of each element of the target well and the adjacent well and a real-time cuttings return ratio; setting a threshold λ of the RMSD Δ of the relative content of each element and a threshold range (a,b) of the real-time cuttings return ratio; and establishing an intelligent stratum identification model based on a support vector machine (SVM) for real-time determination of a horizon from which current cuttings are returned. The method can achieve effective borehole caving detection, such that on-site personnel can deal with borehole caving in time and prevent it from developing into a complicated drilling accident.

公开(公告)号：US20200333221A1

公开(公告)日：2020-10-22

申请号：US16305943

申请日：2017-09-27

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Gao LI ,  Ze CHEN ,  Yijian CHEN ,  Xin YU ,  Dong LIU ,  Yi ZHANG

IPC: G01N3/08 ,  G01N3/06 ,  G01N33/24

Abstract: A strain and acoustic wave testing device includes an acoustic wave transmitting terminal, an upper pressure-bearing shaft, corundum ejector pins, an upper displacement slide, a lower displacement slide, a heat insulation shell, a carbon fiber sleeve, a rock sample, a lower pressure-bearing shaft, an acoustic wave receiving terminal, a lower copper electrode, pearl powder, a temperature sensor, a transformer, a temperature-acoustic wave control box, an oscilloscope, an upper copper electrode, and a data collection and processing system.