PRESSURE-PRESERVED CORING TOOL, USE METHOD, AND RESERVOIR ANALYSIS METHOD

WIPO Patent Application WO/2024/051797

A1

The present invention relates to the field of drilling coring devices. Disclosed are a pressure-preserved coring tool, a use method, and a reservoir analysis method. The pressure-preserved coring tool comprises an outer cylinder (1), a differential assembly (2), a pressure-preserving inner cylinder assembly (4), and a seal assembly (5). The differential assembly is configured to be able to drive the pressure-preserving inner cylinder assembly to move upwards relative to the seal assembly, so that the seal assembly seals the inner cylinder assembly for accommodating a rock core (8). Therefore, in the process of taking out a drilled rock core to the ground, the pressure state of the rock core in an in-situ formation can be preserved in the inner cylinder assembly, so that important information, such as physical properties and fluid distribution characteristics of reservoirs under in-situ formation conditions, is obtained by means of, for example, a nuclear magnetic resonance-based analysis and test method, thereby supporting efficient exploration and development of oil and gas resources.

SU YANG (CN)
SUN SHAOLIANG (CN)
WANG REN (CN)
LUO JUN (CN)
ZHOU SHANGWEN (CN)
XIE MENGYU (CN)
XIA BOYI (CN)
DUAN XIANGGANG (CN)
JIAO YANG (CN)
TANG LIANG (CN)
CHENCHEN DONG (CN)
WEN LI (CN)

PCT/CN2023/117629

March 14, 2024

September 08, 2023

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CHINA NAT PETROLEUM CORP (CN)
GREATWALL DRILLING COMPANY (CN)

E21B25/08

CN110552644A	2019-12-10
CN208619037U	2019-03-19
CN102507626A	2012-06-20
US4356872A	1982-11-02
CN115822492A	2023-03-21
CN204344034U	2015-05-20

RUNPING & PARTNERS (CN)

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