Oil-gas-water three-phase multifunctional detection system

Abstract

The invention provides an oil-gas-water three-phase multifunctional detection system. The system comprises an oil-gas-water separation and storage tank, a gas flow generating and regulating device, a liquid flow generating and regulating device and a multifunctional well casing device, wherein the oil-gas-water separation and storage tank is a device used for separation of oil-gas-water mixed fluid, liquid storage and liquid parameter adjustment, the gas flow generating and regulating device is a device for generating gas, providing power for flow of gas, indicating gas flow, and regulating the gas flow to enable the flow to be constant, the liquid flow generating and regulating device is used for providing power for flow of liquid, indicating liquid flow, and regulating the liquid flow to enable the flow to be constant, and a replaceable shaft is arranged in the multifunctional well casing device and is driven by the multifunctional well casing device to deflect.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to an oil-gas-water three-phase multifunctional detection system. Background technique [0002] The flow of oil-gas-water three-phase fluid in casing in oil well is a complicated technical problem. In order to understand the flow state of oil, gas and water in the cased well, study the flow law, measure the production of each single phase in the flow, and establish an "oil, gas and water three-phase flow experimental device" to simulate the flow of crude oil, natural gas and formation water in the well in the casing . Use this kind of device to carry out the calibration of logging instruments, experiment and study the relationship between various parameters such as the flow rate and velocity of fluid in the well, the production of each phase of oil, gas and water, and provide experimental data for production and scientific research. [0003] The earliest oil-gas-water...

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Problems solved by technology

However, the original device cannot meet this demand, because once the fluid parameters such as fluid viscosity and salinity are changed, the measurement and control accuracy of the device will decrease (the flowmeter in the system will be inaccurate after being affected by the viscosity), and the parts will be damaged by corrosion (after rusting Fluid pollution, worse system accuracy), partial pipeline blockage and other problems occur; in addition, the original device system is huge, the cost is high, and the flow rate is in the range of 0-600m 3 The / d device also needs to invest millions of yuan (RMB); moreover, the original device relies on high-precision flowmeters (such as mass flowmeters) to measure flow, and at low flow rates, the flow measurement (control) accuracy of liquids and gases Low; in addition, the original device is only convenient for simulating a small number of 5.5in (inch) and 7in casings in oil wells, it is not convenient for simulating small diameter (below 100mm) pipelines, it cannot control the degree of fluid mixing (degree of emulsification), and it cannot simulate precipitation in crude oil in wells Uniform tiny bubbles of natural gas; cannot effectively control and measure small gas volumes; cannot control the distribution of gas in the fluid in the well; only used for fluid flow in oil wells, not convenient for checking civil water meters and gas meters; used for testing logging instruments It is inconvenient to test other types of flow meters, etc.

That is to say, the original device has the defects of single function (special purpose and can only simulate flow change), high cost, and poor accuracy at low flow

[0005] The above defects make the original device unable to meet the needs of production and scientific research. For example, in production practice, it is found that parameters such as viscosity and salinity have a significant impact on the capacitive holdup (the space occupancy rate of the phase volume in the flow) meter. It is necessary to use experimental means to determine the degree of influence, and the original device cannot realize this experiment

The mixed state of oil and water affects the response of logging tools, and the original device cannot be simulated, etc.

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