Title:
NEGATIVE-PRESSURE PERFORATION AND DST COMBINATION TESTING STRING
Document Type and Number:
WIPO Patent Application WO/2024/067726
Kind Code:
A1
Abstract:
The present invention relates to the technical field of oil and gas drilling apparatuses, and discloses a negative-pressure perforation and DST combination testing string. The negative-pressure perforation and DST combination testing string comprises an oil pipe, wherein a packer can be arranged on the oil pipe so as to be seated on an inner wall of a casing by means of the packer, thereby separating an upper annulus and a lower annulus. The negative-pressure perforation and DST combination testing string further comprises a pressure transmission pipe and a negative-pressure valve sliding sleeve, which is located in the lower annulus and is sleeved on the oil pile at the position of an oil inlet hole, wherein a pressure acting cavity is provided in the negative-pressure valve sliding sleeve, the pressure transmission pipe is in communication with the upper annulus and the pressure acting cavity, and the negative-pressure valve sliding sleeve is configured to slide off the oil pipe to open the oil inlet hole in the oil pipe when the pressure in the pressure acting cavity exceeds a first preset pressure. By means of the technical solution, the problem in the prior that negative-pressure perforation operations cannot be carried out when a packer lower annulus cannot be pressurized under special well conditions art can be solved.
Inventors:
CHEN JIANBO (CN)
TANG KAI (CN)
LIN ZHIYI (CN)
LUO MIAOZHUANG (CN)
REN GUOHUI (CN)
LUO XIANDONG (CN)
XU JIALE (CN)
MA ZIQIANG (CN)
SU CHEN (CN)
YANG DENGBO (CN)
LI YANXI (CN)
YE ZHONGQIONG (CN)
ZHAO XINDI (CN)
TANG KAI (CN)
LIN ZHIYI (CN)
LUO MIAOZHUANG (CN)
REN GUOHUI (CN)
LUO XIANDONG (CN)
XU JIALE (CN)
MA ZIQIANG (CN)
SU CHEN (CN)
YANG DENGBO (CN)
LI YANXI (CN)
YE ZHONGQIONG (CN)
ZHAO XINDI (CN)
Application Number:
PCT/CN2023/122164
Publication Date:
April 04, 2024
Filing Date:
September 27, 2023
Export Citation:
Assignee:
CHINA NAT PETROLEUM CORP (CN)
CHINA NAT LOGGING CORPORATION (CN)
CHINA NAT LOGGING CORPORATION (CN)
International Classes:
E21B34/08
Foreign References:
| CN114607349A | 2022-06-10 | |||
| CN2453133Y | 2001-10-10 | |||
| CN203114269U | 2013-08-07 | |||
| CN1283736A | 2001-02-14 | |||
| CN2453132Y | 2001-10-10 | |||
| CN113550722A | 2021-10-26 | |||
| CN207795072U | 2018-08-31 | |||
| CN210714598U | 2020-06-09 | |||
| CN106150445A | 2016-11-23 |
Attorney, Agent or Firm:
RUNPING & PARTNERS (CN)
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