해저 석유생산시스템에서 유동안정성 확보를 위한 왁스억제제 선정 실험연구
Experimental Research on Selection of Wax Inhibitor for Flow Assurance in Subsea Petroleum Production System
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초록
해저 저온환경의 석유 생산시스템에서 왁스 집적 제어를 위한 유동안정성 확보 방법 중 왁스억제제 주입법은 적합한 물질을 선정할 경우 효과적으로 왁스집적을 제어할 수 있다. 본 연구에서는 작용 메커니즘 및 주요 사용목적에 따라 왁스억제제를 분류하고 왁스억제제 선정방법을 제안하였다. 선정방법은 총 5단계로 1단계는 분석대상 오일시료의 물성과 성분을 파악하고, 왁스억제 효과 확인을 위해 최대 농도를 2단계에서 설정한다. 3단계는 최대 농도에 따라 사용목적에 적합한 왁스억제제 선정 실험을 수행하며, 결과를 통해 4단계에서 적합한 왁스억제제를 선정한다. 5단계는 왁스억제 최적농도 선정을 위한 평가를 수행한다. 선정방법을 실제 생산된 오일시료에 적용한 결과, 석유 유동점을 낮추는 경우는 유동점강하제인 MMA, 왁스집적속도를 낮추는 경우는 분산제인 TW, 집적된 왁스제거를 위한 경우는 용매제인 Xylene이 선정되었다
Abstract
Wax inhibitor for flow assurance can control the wax deposition effectively if it is properly selected in a subsea petroleum production system in low-temperature environments. In this paper, wax inhibitors are classified according to the mechanism and main purpose. In addition, a method is proposed to select an appropriate wax inhibitor. The selection method is as follows. In stage 1, properties and composition of produced oil are measured. In stage 2, maximum concentration of the wax inhibitor is set for confirming the effectiveness of the wax inhibitor. In stage 3, wax inhibitors considered to maximum concentration are tested to select the effective wax inhibitor depending on its main purpose. In stage 4, the most effective wax inhibitor is chosen by stage 3. In stage 5, The test is conducted to determine the optimal concentration. For application of the proposed method, we carried out the test with produced oil samples. As the results of test, MMA for lowering the pour point of an oil sample, TW for lowering the rate of wax deposition and xylene for removing the deposited wax were selected.
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