Associated gas treatment plant section plug-flow collecting system and method

Abstract

The invention discloses an associated gas treatment plant section plug-flow collecting system and method. The system comprises a gas-liquid-solid separating pipeline system, a double-regulating-valvepressure compensating system, a gas-liquid separating system and a pressure-flow detecting system. The invention discloses a coping strategy and a solution for a large-range plug-flow problem, causedby pressure fluctuations under a low-pressure operation condition, of an associated pipeline. Upstream and downstream pressure jump monitoring and regulating valve control are performed through the double-regulating-valve system and the pressure monitoring system, so that restrain on large-scale section plug-flow is realized; and a diameter-expanding pipeline and a gas-liquid separator are reasonably arranged to perform small-scale section plug-flow collection, so that a large-scale section plug-flow collecting device is prevented from being directly arranged, and stable effect is also achieved for production.

Description

technical field [0001] The invention relates to a slug flow capture system and method of an associated gas treatment plant. Background technique [0002] With the continuous development of oilfield development technology, the recovery and utilization of associated gas has been paid more and more attention, and the concept of direct incineration in the past has gradually changed. Associated gas is a representative product of condensate oil fields and condensate gas fields, and its methane content is lower than that of conventional natural gas, C 3 ~C 5 High component content. Unstable associated gas is usually obtained from condensate oil by vacuum separation, and processed and recovered by a specialized associated gas treatment plant. During pipeline transportation, associated gas is susceptible to liquid phase condensation due to the influence of the environment of buried pipelines, and liquid accumulation is formed in the pipeline, which is more obvious in winter; at th...

AI Technical Summary

Problems solved by technology

As mentioned above, due to the low operating pressure of the associated gas pipeline, the pipe diameter is often large, so the associated gas pipeline accumulates more liquid in winter (due to the low ground temperature in winter, the associated gas in the pipeline is more likely to precipitate condensate), and the flow rate is under pressure. The impact of fluctuations varies greatly, and the single slug flow load is relatively large; in addition, in order to meet the requirements of gas-liquid low-pressure separation, the overall volume of the capture equipment is relatively large; at the same time, as the output gradually declines, after the middle and late stages of operation, the liquid accumulation in the pipeline will further exacerbated

Therefore, the existing associated gas pipeline slug flow treatment schemes often have problems such as huge equipment, difficult equipment installation / transportation, and poor adaptability in the later stage. , economical solution

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