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Title:
WELL LID STRUCTURE, INVERTED-STEP-TYPE SHAFT STRUCTURE, AND BLOWOUT REDUCTION AND AVOIDANCE METHOD
Document Type and Number:
WIPO Patent Application WO/2021/228202
Kind Code:
A1
Abstract:
The present invention relates to a well lid structure, an inverted-step-type shaft structure, and a blowout reduction and avoidance method. A shaft is arranged at the top of an underground pipeline, and makes the underground pipeline be in communication with the ground, and a well lid is arranged at the top of the shaft. One side of the shaft is of a step shape and is mirrored along the axis of a hole opening, the step width thereof is greater than the width of the underground pipeline, and the shaft can be integrally formed and can also be assembled. A first step from among shaft steps is flush with the ground, and a cylinder is dug out in the center of the first step and serves as a shaft mouth; the last step is linked with the top of the underground pipeline, and the slope of a middle step is 30° to 60°; and backfill materials above the steps are flush with the ground. According to the present invention, a driving pressure difference value which forms the blowout is damped, the well lid is provided with vent holes via which the underground pipeline is in communication with the ground atmosphere, non-constant air pressures in the shaft and the underground pipeline are balanced, the air pressure in the pipeline is balanced in advance, and a driving pressure difference extreme value which forms the blowout phenomenon is damped, thereby effectively preventing the formation of blowout occurrence conditions.

Inventors:
WANG FANGFANG (CN)
WU SHIQIANG (CN)
WU XIUFENG (CN)
DAI JIANGYU (CN)
GAO ANG (CN)
YANG QIANQIAN (CN)
ZHANG YU (CN)
HUANG BIAO (CN)
WANG XIAODONG (CN)
CUI PENGFEI (CN)
XU PENG (CN)
YU LEI (CN)
ZHAO YUHANG (CN)
XU ZHUN (CN)
HE JIANMING (CN)
FAN GUFEI (CN)
SHA HAIMING (CN)
Application Number:
PCT/CN2021/093639
Publication Date:
November 18, 2021
Filing Date:
May 13, 2021
Export Citation:
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Assignee:
NANJING HYDRAULIC RES INST (CN)
International Classes:
E02D29/12; E03F5/02
Attorney, Agent or Firm:
NANJING TAIPU PATENT AGENCY (GENERAL PARTNERSHIP) (CN)
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