Pushing device for extraction of formation fluid

Abstract

The invention discloses a pushing device for the extraction of formation fluid, which comprises a main cylinder, and the bottom of the main cylinder is provided with an axially extended central guide rod, on which a first pushing piston and a second pushing piston are sequentially sleeved; the sidewall of the main cylinder is provided with an extension oil port, a formation fluid oil port and a retraction oil port, the extension oil port is communicated with an extension oil chamber of the main cylinder through an extension oil passage axially arranged in the sidewall of the main cylinder, the formation fluid oil port is communicated with a fluid inlet of the central guide rod via a fluid passage, the fluid passage consists of a first passage a second passage and a third passage, wherein the first passage sequentially runs through and is axially arranged in the sidewall of the main cylinder, the second passage is radially arranged in the bottom of the main cylinder, the third passage is axially arranged in the central guide rod, and the retraction oil port is communicated with a retraction oil chamber of the main cylinder through a retraction oil passage of the sidewall of the main cylinder. The pushing device has the advantages of high integration degree and small occupied space, and the arrangement of the control oil passages and the fluid passage of the pushing device is more reasonable.

Description

technical field [0001] The invention relates to a pushing device for extracting formation fluid on a drilling collar base body of a logging instrument. Background technique [0002] On the drilling collar base of the logging tool, a seat seal and push probe should be installed, the purpose of which is to collect the fluid in the well, and the corresponding tests have been carried out. The seat seal pushes against the probe assembly by controlling the movement of the piston through the hydraulic oil circuit, so as to complete the collection and filtration of the fluid. [0003] Due to the unreasonable control oil circuit of the current seat encapsulation ligand structure, the occupied space is large, and the installation and use are very inconvenient. SUMMARY OF THE INVENTION [0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a pushing device for extracting formation fluid that is more reasonable in controlling the...

AI Technical Summary

Problems solved by technology

[0003] Due to the unreasonable control oil circuit of the current seat package ligand structure, it takes up a lot of space, and it is very inconvenient to install and use.

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