公开(公告)号：US20180100352A1

公开(公告)日：2018-04-12

申请号：US15323104

申请日：2015-06-23

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Wei LI ,  Hongxiang LEI ,  Qingyou LIU ,  Shihong XIAO ,  Xu SI ,  Tieshan ZHANG ,  Qing TU ,  Xiao TAN ,  Fanyao JIN ,  Xingming WANG ,  Yuan ZHONG ,  Hang LI ,  Jianchuan WU ,  Dengwei LI

IPC: E21B7/06

CPC classification number: E21B7/064 ,  E21B7/04 ,  E21B7/068 ,  E21B34/06

Abstract: Disclosed is a rotation guidance apparatus belonging to the technical field of oil drilling equipment. An end part of a lower connector (3) has a ball-socketed ball-joint rod (12), and a drill bit (1) is connected to the ball-socketed ball-joint rod (12); several circumferentially and evenly distributed piston holes are provided in a side wall of the lower connector (3), a piston matches each piston hole, and a piston rod (11) connected to the piston is movably connected to the ball-socketed ball-joint rod (12); and a eccentrically-placed valve core (17) is connected to a controller provided in an upper connector (4), a working face of the eccentrically-placed valve core (17) is opposite to the piston holes, and rotation of the eccentrically-placed valve core (17) makes the pistons in the piston holes move to control the rotation guidance of the ball-socketed ball-joint rod (12).

公开(公告)号：US20240376820A1

公开(公告)日：2024-11-14

申请号：US18746950

申请日：2024-06-18

Applicant: Southwest Petroleum University

Inventor： Xiandong JIANG ,  Nutao WANG ,  Chengyang ZHANG ,  Hang LI ,  Min WEI

IPC: E21B49/00 ,  E21B47/06

Abstract: A method for determining well wall collapse of a single well for a fractured-vuggy reservoir is provided. The method includes following steps: S1, treating the single well of the fractured-vuggy reservoir as an isolated reservoir; S2, calculating a water influx rate for the fractured-vuggy reservoir; S3, substituting a formula of the water influx rate into a material balance equation; S4, calculating a change of an oil productivity index without considering the well wall collapse; S5, establishing an optimizing model for obtaining the oil productivity index; S6, calculating the formation pressure at any time in production through step S3; S7, calculating the oil productivity index at any time through the formation pressure, and establishing an optimal objective function; and S8, calculating a difference between the oil productivity index at any time and the theoretically calculated oil productivity index at any time, and determining whether the difference meets an accuracy requirement.