Rock sample in-situ fidelity coring system

Abstract

The invention discloses a rock sample in-situ fidelity coring system. The rock sample in-situ fidelity coring system comprises a driving module, a fidelity module and a coring module which are sequentially connected, the coring module comprises a rock core drilling tool and a rock core sample storage cylinder, the fidelity module comprises a rock core sample fidelity cabin, the driving module comprises a coring drill rig, and the coring drill rig comprises a drill rig outer cylinder unlocking mechanism; the rock core drilling tool comprises a coring drill tool, a core catcher and an inner corepipe, the coring drill tool comprises an outer core pipe and a hollow drill bit, and the drill bit is connected with the lower end of the outer core pipe; the lower end of the inner core pipe extendsto the bottom of the outer core pipe, and the inner core pipe is in clearance fit with the outer core pipe; and the rock core sample fidelity cabin comprises an inner coring cylinder, an outer coringcylinder and an energy accumulator, the outer coring cylinder sleeves the inner coring cylinder, the upper end of the inner coring cylinder communicates with a liquid nitrogen storage tank, the liquid nitrogen storage tank is located in the outer coring cylinder, the energy accumulator communicates with the outer coring cylinder, and the outer coring cylinder is provided with a flap valve. According to the rock sample in-situ fidelity coring system, the rock core is advantageously kept the state under the in-situ environment, the drilling speed can be increased, and the coring efficiency is improved.

Description

technical field [0001] The invention relates to the field of oil and gas field exploration, in particular to a rock sample in-situ fidelity coring system. 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 ...

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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