EVALUATION OF WATER CONING IN VERTICAL WELL ON FIELD “D” WELL “W” BACHELOR THESIS Ni Kadek Widiawati 12219091 Submitted as partial fulfillment of the requirements for the degree of BACHELOR OF ENGINEERING in Petroleum Engineering study program PETROLEUM ENGINEERING STUDY PROGRAM FACULTY OF MINING AND PETROLEUM ENGINEERING INSTITUT TEKNOLOGI BANDUNG 2023 EVALUATION OF WATER CONING IN VERTICAL WELL ON FIELD “D” WELL “W” BACHELOR THESIS Ni Kadek Widiawati 12219091 Submitted as partial fulfillment of the requirements for the degree of BACHELOR OF ENGINEERING In Petroleum Engineering study program Approved by: Thesis Adviser, ………………………… Silvya Dewi Rahmawati, S.Si, M.Si., Ph.D. Mahmud Abubakar Baz eid NIP 198402222014042001 Practical Work Mentor 1 EVALUATION OF WATER CONING IN VERTICAL WELL ON FIELD “D” WELL “W” Ni Kadek Widiawati * Silvya Dewi Rahmawati, S.Si, M.Si., Ph.D. ** Mahmud Abubakar Bazeid *** Copyright 2023, Institut Teknologi Bandung Abstract As we know, the oil and gas industry is a high-risk industry. Various types of problems often occur in the oil and gas industry. One common problem is water production from reservoirs, known as water coning. This topic was chosen because water coning is a serious problem in the oil and gas industry that can disrupt and reduce well production. In addition, water production issues in a field can also affect well operation activities and have negative economic impacts. Therefore, it is important to evaluate water coning in a well. This study was conducted on well "W" in field "D". Field "D" is located in the South Natuna Sea, Block B. Field "D" was discovered in December 1989 and produced its first oil in October 1992. Well "W" is one of the wells in field "D" that began production in December 1992. One common problem in field "D" is the high water cut value, which is an indication of water coning problems. The objective of this study is to evaluate the water coning phenomenon in one of the wells in field "D", namely well "W", and determine the optimum flow rate for well "W" to operate economically. Several data were required for this study, including production data and well properties for well "W". There were several stages involved in this study. The first stage was to analyze the well's production history. The second stage continued by conducting Chan's diagnostic plot model screening. The third stage was calculating the critical flow rate using Meyer-Gardner, Schols, and Chaperon methods. The fourth stage was determining the breakthrough time using the Sobocinski-Cornelius method.