Downhole detection system and method

Abstract

The invention discloses a downhole detection system and a downhole detection method. The downhole detecting system comprises an annular drill collar, two packers, a CT (Computed Tomography) assembly and a hole drilling machine, wherein the two packers are arranged in the vertical direction, and the packers are used for sealing the annular drill collar and the wall of a well; the CT assembly is installed in the annular drill collar and located between the two packers, and the CT assembly comprises a CT assembly body with a scanning chamber; and the hole drilling machine can move relative to the annular drill collar and take sample of the wall of the well. By installing the hole drilling machine and the CT assembly in the drill collar, direct micro-CT detecting can be conducted after rock samples are sampled, and certain influences on the results of the rock samples caused by different detecting environments are avoided.

Description

technical field [0001] The invention relates to the field of exploration of complex reservoirs, in particular to an underground detection system and method thereof. Background technique [0002] In recent years, with the rapid development of precision instruments, computers and control technology, the application field of CT (Computed Tomography) technology has expanded from the initial medical field to material science, life science and reservoir rock research related to the pore structure of porous media. middle. [0003] CT can scan the reservoir rock samples, and then obtain the pore structure image of the reservoir rock. The researchers first processed the cores obtained by drilling and coring, and then performed CT scans under laboratory conditions, and then used relevant data processing software to analyze and reconstruct the image data obtained by CT, and then obtained three-dimensional images. Rock image; finally, the information reflecting the rock pore structure...

AI Technical Summary

Problems solved by technology

More importantly, during the drilling and coring process, the core is inevitably polluted by drilling fluid and other fluids. After the researchers get the core, they often need to perform a series of treatments on the core, such as washing oil and salt. It will cause damage to the original rock pore structure to a certain extent, and the CT measurement results based on this will inevitably be different from the real situation of the reservoir rock, which will have a certain impact on the analysis results of the reservoir rock pore structure

[0006] (2) The measurement cycle of CT is too long

Although the indoor CT measurement itself does not take a lot of time, it often takes nearly one year for the experimental rock sample to go through the preliminary preparation work from the initial on-site drilling sampling, rock sample selection and processing, washing oil and salt to the final CT measurement. months, which makes the researchers' research results lag behind

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