Rock core distinguishing module and downhole instrument suitable for slim hole

Abstract

The invention discloses a rock core distinguishing module and a downhole instrument suitable for slim holes. The rock core distinguishing module comprises guide plates, a spacer base body and a rock core channel are arranged in parallel, a first slide way communicating the rock core channel with a spacer bin is arranged on the spacer base body, a sliding block is arranged to slide in the first slide way so as to push a spacer in the spacer bin into the rock core channel, a power mechanism is connected with the sliding block through two guide plates, the two guide plates are arranged on the two sides of the sliding block respectively, and the guide plates are arranged to slide on the spacer base body in the length direction of the spacer base body. The downhole instrument comprises a rock core barrel, a hydraulic power system and the rock core distinguishing module, the rock core distinguishing module is connected with the rock core barrel, and the hydraulic power system is connected with a hydraulic thrust cylinder. The invention relates to the field of oil exploration and development, and provides the rock core distinguishing module and the downhole instrument suitable for the slim holes, the rock core distinguishing module is arranged in the length direction of the instrument, the radial size and the occupied space can be reduced, the movement direction is changed by utilizing the guide plates, and spacer insertion is achieved.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, more specifically, to a core distinguishing module and a downhole instrument suitable for slim holes. Background technique [0002] Conventional downhole tools for sidewall coring mostly use hydraulic motors or DC motors to drive diamond drill bits to drill cores for coring operations. Whether the coring operation is successful or not can only be preliminarily judged by the display of the ground instrument. The length of the core cannot be controlled. Once a certain layer of coring fails, other cores obtained cannot be positioned with the layer and depth after entering the core barrel. For later core analysis, reservoir analysis has brought many problems. The current instrument usually adds a spacer insertion structure. After taking the core, the spacer is added to separate the adjacent cores, so that each core can be accurately distinguished, and analyzed together with the d...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the spacer insertion structures used are powered by hydraulic cylinders to push the spacers into the core barrel. The hydraulic cylinders need to be arranged along the radial direction of the instrument. This structure takes up a lot of space and is not conducive to the structural design of other parts of the instrument.

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