Fidelity retaining type coring device for rock sample

Abstract

The invention discloses a fidelity retaining type coring device for a rock sample. The coring device comprises a rock core drilling tool, a rock core sample storage cylinder and a rock core sample fidelity retaining cabin; the rock core drilling tool comprises a coring drilling tool body, a core capturing device and an inner core pipe; the coring drilling tool body comprises an outer core pipe anda hollow drill bit, wherein the drill bit is connected to the lower end of the outer core pipe; the lower end of the inner core pipe extends to the bottom of the outer core pipe; the inner core pipeis matched with the outer core pipe in a clearance fit mode; the rock core sample fidelity retaining cabin comprises an inner coring barrel, an outer coring barrel and an energy accumulator; the outercoring barrel sleeves the inner corking barrel; the upper end of the inner coring barrel is communicated with a liquid nitrogen storage tank, and the liquid nitrogen storage tank is located in the outer corking barrel; the energy accumulator is communicated with the outer coring barrel; and the outer coring barrel is provided with a flap valve. The coring device has the advantages that a rock core can keep the state of the rock core in an in-situ environment, in addition, the drilling speed can be increased, and the coring efficiency can be improved.

Description

technical field [0001] The invention relates to the field of oil and gas field exploration, in particular to a rock sample fidelity coring device. Background technique [0002] In the process of oilfield exploration, cores are important data for discovering oil and gas layers and studying formations, oil source layers, oil reservoirs, cap rocks, structures, etc. Through observation and research on cores, we can directly understand the lithology and physical properties of underground rock formations And oil, gas, water features. After the oilfield is put into development, it is necessary to further study and understand the sedimentary characteristics of the oil layer, the physical properties, pore structure, wettability, relative permeability, lithofacies characteristics of the reservoir, the physical simulation of the oil layer and the water flooding law of the oil layer through the core; In the development stage and the water flooding characteristics of oil layers in diffe...

AI Technical Summary

Problems solved by technology

[0004] Coring tools include core drilling tools and core catchers. After the core drilling tools cut into the formation, the core catchers are used to keep the core in the inner cylinder. The existing core catchers can only take soft rocks, and it is difficult to take hard rocks.

In addition, the cooling speed of the blade of the existing core drilling tool is slow, the wear of the tool is fast, and the service life of the blade is short

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