Gas well fracturing flow-back fluid separation device

Abstract

The invention provides a gas well fracturing flow-back fluid separation device, which includes a gas-liquid separation tank. The upper air outlet of the gas-liquid separation tank is provided with an upward floating ball valve, the lower liquid outlet is provided with a downward floating ball valve, and a baffling separation plate is disposed between the upward floating ball valve and the downward floating ball valve. One side inlet of the gas-liquid separation tank is connected to a flow-back fluid inlet through a pipeline. The pipeline between the gas-liquid separation tank and the flow-back fluid inlet is also connected to an energy dissipater, the upper air outlet of the gas-liquid separation tank is in connection with a gas collector through a pipeline, the gas-liquid separation tank lower liquid outlet is connected to a liquid-solid separator through a pipeline. The fracturing flow-back fluid separation technology and device provided by the invention adopt vertical separation, and the formed liquid level is high, thus being convenient to control the liquid outlet. The air outlet and liquid outlet adopt floating ball valve control, thus realizing only liquid can be discharged through the liquid outlet and only gas can be discharged throught the air outlet when the gas-liquid ratio is very large or small.

Description

technical field [0001] The invention relates to the field of oil and gas field development safety and environmental protection, in particular to a gas well fracturing flowback liquid separation device. Background technique [0002] There are nearly 700 gas wells in Changqing Oilfield, and fracturing is one of the main measures to increase production of gas wells. After the fracturing operation is completed, a large amount of natural gas is mixed in the flowback fluid. In order to separate natural gas and fracturing fluid economically and effectively, it is very important to design a suitable separation device. [0003] In the current liquid drainage process after conventional fracturing of gas wells, the gas-liquid separation device is only used in the production test stage. In the process of blowing liquid discharge, due to the rapid erosion of sand liquid, the separation device is not used for separation, but It is to return the spray liquid to the drain pool for separati...

AI Technical Summary

Problems solved by technology

[0007] The gas-liquid separation device for production is separated under high pressure, and its ability to separate gas reaches 300,000 cubic meters per day. The gas outlet is discharged through a restrictor, and the diameter of the restrictor is within 8mm. The separation device The working pressure is within 10MPa; when the separation is performed, the liquid outlet is closed, and when the liquid level rises to a certain level, it is necessary to manually open the valve to discharge the liquid; if the liquid cannot be discharged in time, the gas outlet may discharge liquid As a result, the separated gas contains a large amount of water, and even the flame of the ignition system is extinguished, causing the combustible gas to diffuse, causing a deflagration accident

[0008] Through the above technical background analysis, in order to effectively process and recover the gas and liquid returned during the blowout process, it is necessary to solve the problem of separation of gas, liquid and sand in the returned fracturing fluid, but the separation is at high pressure and high pressure. The flow rate is separated when the gas and liquid contain a certain concentration of sand particles. Therefore, it is not an easy task to separate the spray liquid. Certain technical principles and methods must be adopted to solve the problem.

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