Introducing a New Correlation for Multiphase Flow Through Surface Chokes With Newly Incorporated Parameters
- Mahmoud Safar Beiranvand (University of Tehran) | Mohammad Babaei Khorzoughi (University of British Columbia)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- November 2012
- Document Type
- Journal Paper
- 422 - 428
- 2012. Society of Petroleum Engineers
- 4.1.5 Processing Equipment, 4.1.2 Separation and Treating, 1.3.1 Surface Wellheads, 5.3.2 Multiphase Flow
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- 492 since 2007
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Flow-rate prediction of oil production wells is of prime importance to effectively confront high-water-cut and separator problems. (Semi-) empirical multiphase-flow correlations are proved quite useful for this purpose. This work presents new generalized multiphase flow choke correlation, derived on the basis of actual production data from horizontal and vertical wells from an oil field in Iran. The newly established correlation predicts liquid flow rates as a function of flowing wellhead pressure, gas/liquid ratio, surface wellhead choke size, and the newly incorporated parameters: basic sediment and water (BS&W) and temperature. To evaluate the influence of these two new parameters, a parameter-sensitivity analysis was performed and the results are shown. This proposed correlation exhibited an average error of roughly 2.89%, which is superior to those previous correlations in the literature that did not use these two newly incorporated parameters (BS&W and temperature). These new parameters can be added to the previous correlations when the water cut and temperature become important in the production history of the wells.
The phenomenon of multiphase flow (liquid and gas) happens in the wellhead of the majority of the producing wells. As the regulation of the flow rate becomes important during the production period in the producing wells, chokes are used for isolating the underground reservoir from pressure variations in the surface equipment, and also they are used for preventing or reducing the water production. Larger amounts of produced water from oil recovery result in increasing of operating costs and are a major environmental concern for oil production (Jin and Wojtanowicz 2010).
Although numerous multiphase-flow correlations are included in the literature (Al-Attar 2010), almost all of them are limited to a special operational condition in which the correlations are driven. As a result, the strength of those correlations for predicting the actual flow rate is restricted.
Gilbert (1954) developed the most popular multiphase flow surface choke correlation, but this correlation is valid for the critical flow condition when the upstream pressure of the choke is 70% or more higher than the downstream pressure (Ghareeb and Shedid 2007).
Flow through the wellhead chokes is mainly divided into two critical and subcritical conditions. Within this manuscript, the critical-flow condition refers to the state at which the flow rate reaches a maximum amount independent of the downstream and upstream pressure difference of the choke. Empirical correlations are mainly used for critical-flow condition.
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