Multi-tube type minimum mixed-phase pressure measuring method and device

Abstract

The invention relates to a multi-tube type minimum mixed-phase pressure measuring method and device. The multi-tube type minimum mixed-phase pressure measuring device comprises multiple slim pipes connected in parallel, wherein each slim pipe is internally filled with quartz sands for simulating loose sandstone in a stratum; two ends of each slim tube are respectively connected with a fluid inlet and a fluid outlet; an injection pump is connected with the fluid inlet through a middle container; the fluid outlet is connected with a back-pressure valve; an inlet-end reciprocation pump is connected between the fluid inlet and the middle container; an outlet-end reciprocation pump is connected between the fluid outlet and the back-pressure valve; and two ends of each slim tube are provided with interface control valves capable of connecting or disconnecting each slim tube with both the fluid inlet and the fluid outlet. The multi-tube type minimum mixed-phase pressure measuring method, disclosed by the invention, enables gas and crude oil to flow in a reciprocation manner for multiple times in each slim tube by depending on a displacement force, so that the gas and the liquid can be mixed fully. Each slim tube can finish the test of one pressure point, and the measuring data of multiple pressure points can be obtained sequentially through multiple slim tubes, so that the accuracy of the data measurement is improved; and convenience for operation and short test period are obtained.

Description

technical field [0001] The invention relates to a method and device for measuring minimum miscible pressure, in particular to a multi-tube type minimum miscible pressure measuring method and device, belonging to petroleum physical property measurement technology. Background technique [0002] The minimum miscible pressure (MMP) is the most basic petroleum physical property parameter in the design of oilfield gas flooding development scheme. A large number of studies have confirmed that gas drive development in a miscible state can greatly increase oil recovery, so it is very important to determine the minimum miscible pressure under reservoir conditions through laboratory research. [0003] The currently known methods for measuring the minimum miscible pressure mainly include the narrow tube test method and the interfacial tension method, among which the narrow tube test is a commonly used measurement method in engineering application design. Wherein, the known capillary me...

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Problems solved by technology

[0008] 2. The thin tube experiment has a long measurement period, and each experiment needs a period of 1-2 months

[0009] 3. Under high temperature and high pressure conditions, when corrosive gases are used in the experiment, pipeline corrosion and leakage often occur in a long period, resulting in the extension of the experiment period

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