Oil-gas phase state multilayer sampling method and device

Abstract

The invention relates to an oil-gas phase state multilayer sampling method and device, wherein the device comprises a PVT (pressure volume temperature) cylinder for storing oil-gas test samples, a sapphire glass which seals one end of the PVT (pressure volume temperature) cylinder, a plug arranged in the PVT (pressure volume temperature) cylinder and capable of moving under the control of a step motor in order to keep the pressure in the PVT (pressure volume temperature) cylinder, an upper feeding opening arranged on the upper side wall of the PVT (pressure volume temperature) cylinder for injecting stratum oil samples, a lower feeding opening arranged on the lower side wall of the PVT (pressure volume temperature) cylinder for injecting gas samples, and a plurality of sampling pipes respectively connected on different height positions of the side wall of the PVT (pressure volume temperature) cylinder for sampling the components of each layer. The real-time analysis and the on-line sampling of the components in the oil-gas phase mixing process are realized, and the process from the contact of the oil gas gradually to the mixed phase is indicated truly. With the adoption of the method and the device, in macro, different phase mixed zones are viewed directly, and in micro, the component change of different phase mixed zones are tested.

Description

technical field [0001] The invention relates to oil and gas component testing technology, in particular to a multi-layer sampling method and device for oil and gas phase states. Background technique [0002] Oil and gas phase test is a commonly used basic test method to evaluate the properties of formation oil. Accurately obtaining the oil and gas phase state parameters in the reservoir is inseparable from the phase state instrument (such as PVT tube). Existing PVT cylinders usually only have the test capabilities of P-V relationship, multiple degassing, depletion experiments and single degassing, however, with the CO 2 Field large-scale test of miscible flooding, CO 2 - The miscible or near-miscible state of formation oil is complex and changeable, and there are many types of oil-gas miscible or near-miscible areas. The existing design of PVT tubes can no longer meet the actual test requirements. Contents of the invention [0003] The invention provides a multi-layer sa...

AI Technical Summary

Problems solved by technology

Existing PVT cylinders usually only have the test capabilities of P-V relationship, multiple degassing, depletion experiments and single degassing, however, with the CO 2 Field large-scale test of miscible flooding, CO 2 - The miscible or near-miscible state of formation oil is complex and changeable, and there are many types of oil-gas miscible or near-miscible areas. The existing design of the PVT tube can no longer meet the actual test requirements

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