A kind of coring device and coring method

A technology of coring device and coring bit is applied in the direction of extracting undisturbed core device, valve device of wellbore/well, earthwork drilling, etc. It can solve problems such as ball valve stuck, and achieve the effect of accurate results and simple structure.
CN113356779BActive Publication Date: 2022-03-29SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2022-03-29

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Abstract

The invention discloses a coring device and a coring method. The coring device includes an upper connecting buckle, a coring outer cylinder and a coring drill bit connected in sequence, the inner hole of the connecting buckle of the upper connecting buckle, the The inner hole of the core outer cylinder and the inner hole of the core bit are connected to form a first shaft hole, and a detachable valve, a slidable differential lifting rod, and a valve connected to the first shaft hole are arranged in the first shaft hole. The core-taking inner cylinder of the differential lifting rod, the core-taking hole of the core-taking drill bit communicates with the core-taking inner cylinder through the valve, and the differential lifting rod is also connected with a lifting mechanism, and the lifting mechanism can drive The differential lifting rod and the coring inner cylinder are separated from the valve by a certain distance and the valve is closed; the coring method includes putting in a sealing ball to make the lifting mechanism drive the differential lifting rod to rise. In the present invention, the valve is closed after the rock core is away from the valve for a certain distance, which avoids the problem that the valve is stuck by the rock core, and improves the reliability of heat preservation and pressure-holding coring.
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Description

technical field

[0001] The invention relates to the technical field of oil and gas exploration coring, in particular to a coring device and a coring method. Background technique

[0002] Rock core is the most intuitive and reliable valuable information reflecting the underground sedimentary environment. When conducting rock mechanics test research, usually the rock or core is taken out first and processed into standard specimens before testing. However, after the core is taken out from the in-situ environment, some components of the core are oxidized after being exposed to the outside air, the original pressure is released, and the oil, gas and water in the core are volatilized and lost due to the change of the original pressure and temperature of the formation. , the physical properties of the rock will also be destroyed. In order to make the oil and gas characteristics of the core consistent with the real situation of the formation, and to ensure the accurate calculation ...

Claims

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