Supercritical well bore multi-phase flow test device

Abstract

The invention relates to a supercritical well bore multi-phase flow test device which simulates exploitation of high-pressure and high-yield natural gas field under critical condition. The technical proposal is as follows: the test device comprises a water tank, a high-pressure hydraulic pump, a liquid flow controller, a high-pressure gas compressor, a high-pressure gas tank, a dryer, a gas flow controller, a gas-liquid mixer, a high-pressure well bore, an inner pipe, a return pipeline, a gas-liquid separating tank, a back pressure control system, a temperature control system, a void ratio measuring system and a pressure difference measuring system. The test device has the beneficial effects of (1) simulation of gas flow in the well bore under critical condition; (2) simulation of gas-liquid multi-phase flow under critical and supercritical conditions; (3) simulation of gas or gas-liquid multi-phase flow under normal pressure. The device can be built into a comprehensive supercriticalwell bore multi-phase flow simulation testing platform and become an important base for national supercritical well bore multi-phase flow research.

Description

1. Technical field: [0001] The invention relates to a wellbore multiphase flow experimental system, in particular to a supercritical wellbore multiphase flow experimental device for simulating the exploitation of high-pressure and high-yield natural gas fields under critical conditions. 2. Background technology: [0002] There are a large number of high-pressure, high-yield, and high-sulfur natural gas resources in the southwest and northwest of my country. The proportion of these natural gas resources in my country's total energy is gradually increasing, and it is gradually becoming the focus of my country's oil and gas resources development. However, due to the complex geological structure, deep burial of oil and gas resources, high formation pressure, high production, high concentration of H2S in some areas, and difficulty in formation pressure prediction in these areas, the development of this type of gas reservoirs faces many safety problems. There are many security ris...

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Problems solved by technology

[0003] For the "three high" gas reservoirs, most of them are buried deep, and the formation fluid is in a critical or supercritical state, and the critical or supercritical fluid has good solubility. Under the bottom hole condition, a large amount of supercritical fluid will be dissolved in the drilling fluid. The multiphase fluid system is affected by pressure and temperature changes during the migration along the wellbore, and each phase in the system will undergo physical and chemical processes such as phase state changes or interphase mass transfer, as well as energy and momentum transfers, resulting in The physical parameters of the fluid in the well change rapidly with the well depth and time in a very short period of time, making the flow law of the fluid in the annular space very complicated

How to predict the corresponding annular pressure profile according to the flow pattern and phase change of the fluid in the annular space under various well depth conditions is the difficulty of accurately controlling the wellbore pressure. Device replacement has not been reported

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