Core segmented sealing device and application method

Abstract

The invention provides a core segmented sealing device and its application method and belongs to the field of petroleum geology. The device comprises a core storage cylinder and inflation sealing rings. The core storage cylinder has a cylindrical structure, one end of which is a sealed end and the other end of which is an open end. The open end is provided with a top cover. At least two pilot holes are arranged on the wall of the core storage cylinder. Each pilot hole contains two through-holes which are apart from each other 180 degrees on a circle. Axes of all through-holes are vertical to the axis of the core storage cylinder 1. The inner wall of the core storage cylinder is provided with at least two annular seal grooves. Each annular seal groove is corresponding to a pilot hole. Each pilot hole enables its corresponding annular seal groove to be communicated with the outside world. One of the inflation sealing rings is installed in each annular seal groove. By the use of the device, rapid and segmented sealed storage of cores is realized, gas dissipation under the atmospheric condition is minimized, and a foundation is laid for the next steps of analytical tests and research work.

Description

technical field [0001] The invention belongs to the field of oil and gas geology, and in particular relates to a rock core segmented sealing device and an application method thereof. Background technique [0002] As a precious formation sample, the core can still obtain formation fluid, formation lithology, mineral composition, reservoir Important information such as permeability properties and their interrelationships play an irreplaceable role in oil and gas evaluation. At present, in order to obtain formation fluid information from the core and reduce the further loss of fluid after the core is lifted to the wellhead, various technical methods and means are used. [0003] According to the introduction of "SY / T5336-1996 Conventional Analysis Methods of Rock Cores" and "SY / T5336-2006 Conventional Analysis Methods of Rock Cores", the sealed preservation of rock cores mainly adopts container sealing method, freezing method, wax sealing and other methods, the details are as f...

AI Technical Summary

Problems solved by technology

One is that it is inconvenient to collect and analyze the gas; the other is that the sealing process is long, which easily leads to gas escape

The third is that after a section (of a certain length) of core is sealed and preserved, it is difficult to obtain the information of the axial gas content change of this section of core in the sealed state.

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