When fluid inside pipe travels to the circulation sub, it faces 2 choices. The rates of flow through the circulation sub and down the string are determined when these two flow paths reach a pressure balanced state. The flow split at a circulation sub is determined as the fluid chooses the path of least resistance. By adjusting the TFA of the circulation sub, you can control the amount of fluid that is diverted. Note that the flow rate is left blank because it is run at several values for all stages.Ĭirculation sub’s adjustable nozzles enable you to define how the flow is split between the annulus and the pipe interiors. This is the basic case, from which we will perform sensitivity studies on each of 5 parameters. The flow split is obtained such that the summation of the frictional pressure losses inside the pipe below the circulation sub and in the annulus below the circulation sub should be equal to the pressure loss through the circulation sub nozzles.įigure 2 shows the wellbore configuration used for the example calculation. Numerical methods are employed to obtain the correct flow split percentage at the location of the circulation sub. We used a wellbore cleanup hydraulics software to perform this case study. This case study will quantify the impacts of various circulation sub parameters and fluid properties on pump pressure and ECD for a wellbore cleanup operation. ![]() For example, increasing the total flow area of a circulation sub will increase the bypass flow rate, reduce pump pressure, etc. ![]() Engineers may have some basic ideas on how to optimize the design parameters of a circulation sub to achieve their goals.
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