High mechanical impurities content in production fluid is one of the main causes high mechanical impurities content in production fluid. In the field practice there are many technologies to minimize solid phase flow from reservoir to the bottomhole and various technique units to protect submersible pumping equipment. However, currently there is no detailed study of technical and technological efficiency parameters. Different methods and technologies to solve the problems of oil (water) well production, complicated by solid phase flow, are used. In this paper the study results of the submersible sand centrifugal separation for artificial lift are presented, with consideration of the abnormal well conditions. In Gubkin University at Reservoir and Production Petroleum Engineering Department (RPPED) experimental stand unit to complex study of submersible sand separator (model “PSM") with hydraulic gate was constructed. Experimental stand unit allows determining submersible sand separator (SSS) efficiency. The submersible sand separator experimental stand studies have been conducted on model mixtures “water – solid particles (suspended solids content up to below 2 g/l)" and “water – gas (flow gas content up to 60%) – solid particles". The influence patterns of suspended solids content, inlet flow gas content and granulometric on “PSM" separation efficiency are determined. The “PSM" efficiency was experimentally confirmed and the separation coefficient values were obtained, which exceeded the performance of the similar devices. The workflow to select candidate-wells for this protective device application was developed. A new technological scheme to lift separated impurities bypassing submersible pumping equipment on the day surface is proposed.
Artificial lift of oil by electric submersible pumps (ESP) is often complicated by free gas in production. Free gas content in production leads to ESP performance degradation in rate and head. Gas slip in the ESP impeller is one of the reasons of ESP performance degradation. Thus, the goal of the work is to determine the gas slip coefficient i.e. liquid holdup in the ESP impeller. It is known that a gas-liquid mixture (GLM) flow characterized by a slippage effect. Gas slippage relative to the liquid determines the GLM structure (bubble, dispersed-bubble, slug, stratified or annular), as well as the difference between the GLM densities calculated by liquid holdup or liquid volume content. Special stand was designed and created to determine the liquid holdup at the Department of Oil Fields Development and Operation of Gubkin University. Liquid holdup in the impeller of the ESP was measured by the method of cutting off the flow. This paper shows the results of experimental studies of liquid holdup and gas slip velocity in the ESP impeller (ESP5-50) at a rotational speed n = 2997 rpm, at an absolute intake pressure Pin = 0.4 MPa. The dependence of the liquid holdup on liquid volume content (i.e. the dependence of the gas void fraction on gas volume fraction) was determined for the model GLM "water-air", "water-surfactant-air" with different foaming capacity. The degradation of the ESP characteristics, boundaries of surging and gas locking limits are determined taking into account liquid holdup. The dependence of gas holdup was experimentally obtained over the entire range of ESP operation (from 0.5∙Qopt to Qmax). A comparison of the obtained correlation with existing models is presented too. A new correlation for predicting liquid holdup in the ESP impeller for the low-rate wells operation is obtained. A new approach to determining the liquid holdup and consequently gas slip velocity in the ESP impeller is proposed.
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