Sidek, Sulaiman (PETRONAS Carigali Sdn. Bhd.) | M Hatta, Siti Aishah (PETRONAS Carigali Sdn. Bhd.) | Goh Hui Lian, Kellen (PETRONAS Carigali Sdn. Bhd.) | Tan, Kok Liang (PETRONAS Carigali Sdn. Bhd.) | M Yusuf, M Hafizi (PETRONAS Carigali Sdn. Bhd.) | Tanf Ye Lin, Catherine (PETRONAS Carigali Sdn. Bhd.) | Mawardi, M Hizbullah (PETRONAS Carigali Sdn. Bhd.) | Hamzah, Haziqah (PETRONAS Carigali Sdn. Bhd.) | Masngot, Ainul Azuan (PETRONAS Carigali Sdn. Bhd.) | Jeffry, Suzanna Juyanty M (PETRONAS Carigali Sdn. Bhd.) | Riyanto, Latief (PETRONAS Carigali Sdn. Bhd.) | Samaile, Eddy (PETRONAS Carigali Sdn. Bhd.) | Ahmat Kamis, Azman (PETRONAS Carigali Sdn. Bhd.)
Flow assurance has been a big focus of oil and gas operation in ensuring the delivery of the targeted production. A few fields located offshore Malaysia have been experiencing solid deposition inside tubing and stable micro-emulsion from early stage of their life. Oil production from Field W begin in January 2003, unfortunately when the wells were first opened-up it was observed to produce viscous emulsion and the production decline rapidly. Multiple analyses and efforts, including chemical and mechanical treatments, conducted over the years with minimal success. The damaging mechanism was determined to be caused by rare High Molecular Weight Organic Deposit (HMWOD) that have caused a significant pressure drop in the tubing, which consequently restrict oil production and tested to only disperse at above 100°C. It was suspected that the organic deposit was a naturally-occurring component of the crude oil itself, separating from the bulk of the crude as a consequence of the fluids movement towards the wellbore and the consequent drop in fluid pressure.
This paper focuses on the step-by-step workflow developed to identify the solid deposition, laboratory testing, treatments conducted and the result of different chemical treatments in Field W. The ultimate effort was by developing an advanced eco-friendly nano-fluid to remediate the rare issue of HMWOD and high melting point deposit in the field. The nano-fluid pilot treatment was conducted in 2014 and successfully rejuvenate the well with total of 20,000bbl incremental oil volume. Early 2018, subsequent treatments were conducted that contributed substantial improvement to the field production and at lower total treatment cost. This advanced chemical using nano-fluid technology concept is deemed feasible and will be further replicated in other fields.
This paper is highly beneficial to operators, petroleum and flow assurance engineers experiencing flow assurance issue on organic scale such as microcrystalline wax, high molecular weight wax and stable emulsion in the crude production. This paper also promotes the use of nano-fluid technology as part of the solution to flow assurance issue in Oil and Gas industry.