A brittle core and irregular core clamping device and its core drilling method

Abstract

The invention discloses a brittle core and irregular core clamping device and a core drilling method thereof. The brittle core and irregular core clamping device comprises a rack, a left clamping module, a right clamping module and a crank; the left clamping module and the right clamping module are located on the left side and the right side of the rack separately; the left clamping module moves left and right on the rack under the action of the crank; the right clamping module is fixedly arranged on the rack; the crank is located on the left side of the rack; and the inner end portion of thecrank is fixed to the outer end portion of the left clamping module to achieve left-and-right movement of the left clamping module. Core drilling and coring work of brittle cores and irregular cores can be achieved, so that the cores are not prone to being broken or shifting in the drilling process, and the success rate of a drilling plunger is increased; useful first-hand information is providedfor various later experiments; and the blank that the brittle cores and the irregular cores are difficult to drill is filled up.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development experiments, in particular to a brittle core and irregular core clamping device and a core drilling method thereof. Background technique [0002] Core sampling is a necessary means to obtain first-hand geological core data. With the advancement of exploration and development technology, there are more and more unconventional core samples, and the exploration and development of shale gas and coalbed methane are on the agenda. The core samples of this type of reservoir are often easily broken, and it is difficult to drill core plug samples for experimental analysis. For such cores, how to drill shaped plunger samples for analysis to obtain experimental data is an important issue. [0003] In actual work, there are some irregular blocky cores (for example: apple shape), this part of the core is difficult to fix with a common vise, and the core is easily moved by the to...

AI Technical Summary

Problems solved by technology

[0004] In the existing core drilling method, in the process of drilling brittle core and irregular core, due to the limitation of the existing core clamping method, the holder and the core are in point contact or linear contact, the contact area is small, and the The core is unevenly stressed and the stress is too concentrated. In addition, due to the complex stress formed by the rotation and vibration of the drill bit, this type of core is easily broken or displaced during the drilling process, resulting in the failure of the drilling plunger.

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