Prayudha, Yandre Alfa (2026) Pengembangan Model Simulasi Produksi Minyak Menggunakan Software Prosper Dan Software PVTP Pada Kasus Masalah Wax Deposit Di Sumur X Serta Studi Efektivitas Wax Dissolver Sebagai Pelarut Endapan Wax Pada Sumur X. Other thesis, Universitas Islam Riau.

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Abstract

Wax deposition is a common problem encountered in the oil and gas industry and is one of the key flow assurance issues that significantly impacts the production performance of paraffinic crude oil. This study aims to analyze the mechanism of wax/paraffin formation, validate the location of wax deposition through the integration of simulations using PROSPER and PVTP software, and evaluate the effectiveness of wax dissolvers in improving fluid properties and flow capability in Well X. In this research, an analysis is carried out on a model developed to represent field conditions. The model is built based on historical production data that shows declining performance leading to production shutdown caused by wax/paraffin. Sprayflow refers to the condition observed during sampling at the wellhead, in which the sampled fluid consists of oil integrated with gas, flowing simultaneously and appearing as a gas–oil mixture where the gas phase is either equal to or more dominant than the oil. The sprayflow model developed in PROSPER shows good correlation with field conditions, particularly the sharp temperature drop in the upper section of the tubing. Gradient traverse results indicate that the fluid temperature at a depth of 180 meters ranges between 33–39°C. This temperature is far below the Wax Appearance Temperature (WAT), which is 58.31°C for the fluid in Well X. This finding is consistent with milling job results performed in the field, where wax/paraffin obstruction was found at the same depth, validating the accuracy of the simulation model. Wax characterization of samples collected from Well X shows a very high paraffin content—approximately 70.26% at the wellhead and 70.65% at the flowline—with pour points ranging from 16.7 to 23.9°C. These results confirm the strong tendency of the crude oil to form wax. Laboratory evaluation of several wax dissolvers was conducted to identify the most suitable candidate for Well X. The results indicate that two solvents qualified for further testing. Wax dissolver A achieved a wax dissolution efficiency of 76.61%, while wax dissolver E achieved 70.84% based on xiv bottle test results. The immersion bottle test showed dissolution times of 38 seconds for wax dissolver A and 47 seconds for wax dissolver E. These findings indicate that wax dissolver A will be used as the solvent for wax treatment. In the sprayflow modeling conducted using PROSPER, two sprayflow models were developed to represent different conditions: (1) sprayflow before treatment using the Black Oil method, and (2) sprayflow after treatment using the EOS (Equation of State) method. These two models were compared to determine whether changes occurred in fluid properties or production performance after treatment. The posttreatment EOS fluid model shows changes in the physical properties of the fluid, including a reduction in viscosity from 3.27 cp to 0.6 cp and a decrease in density from 51.69 lb/ft³ to 46.85 lb/ft³. These changes result in a shift in the IPR curve and a decrease in pressure along the VLP curve, indicating a notable improvement in flow performance.

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