Title:
CASING NIPPLE AND TUBULAR STRUCTURE
Document Type and Number:
WIPO Patent Application WO/2024/083173
Kind Code:
A1
Abstract:
The present application provides a casing nipple and a tubular structure. The casing nipple comprises a cylinder and a repair component. The cylinder comprises an inner cylinder and an outer cylinder. In the axial direction of the inner cylinder, the outer cylinder is sleeved outside the inner cylinder. A first accommodating space is formed between the outer cylinder and the inner cylinder. A flow stopping part protrudes from the outside of the outer cylinder. The repair component is located in the first accommodating space. The outer cylinder is provided with a radial through hole. In the axial direction of the inner cylinder, the radial through hole is arranged corresponding to the lower end of the repair component. The radial through hole and the flow stopping part are spaced apart from each other. The radial through hole is located above the flow stopping part. The casing nipple of the present application can solve the problem of potential safety hazards due to the presence of a micro-annulus or cement sheath crack in an oil/gas well casing-cement sheath system causing a high-temperature and high-pressure fluid of a stratum to flow to a wellhead.
Inventors:
ZHANG BO (CN)
LUO FANGWEI (CN)
DENG JINRUI (CN)
SUN BINGCAI (CN)
ZHENG YUSHAN (CN)
LIANG SHUANG (CN)
JIANG RUIJING (CN)
CAO LIHU (CN)
LI MOSONG (CN)
LUO FANGWEI (CN)
DENG JINRUI (CN)
SUN BINGCAI (CN)
ZHENG YUSHAN (CN)
LIANG SHUANG (CN)
JIANG RUIJING (CN)
CAO LIHU (CN)
LI MOSONG (CN)
Application Number:
PCT/CN2023/125324
Publication Date:
April 25, 2024
Filing Date:
October 19, 2023
Export Citation:
Assignee:
CHINA NAT PETROLEUM CORPORATION (CN)
CNPC RESEARCH INSTITUTE OF SAFETY AND ENVIRONMENTAL TECH CO LTD (CN)
CNPC RESEARCH INSTITUTE OF SAFETY AND ENVIRONMENTAL TECH CO LTD (CN)
International Classes:
E21B29/10; E21B17/08
Attorney, Agent or Firm:
LEADER PATENT & TRADEMARK FIRM (CN)
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