After several discoveries of oil and gas in fractured basement reservoir such as White Tiger, Dragon, Aurora and Ruby in 1990s, the basement on the continental shelf of Vietnam has become a major target for domestic and foreign oil companies. Oil produced from basement is accounted for more than 90% of the total produced oil. Due to lesser and lesser new discoveries and most of the big oil fields are in declining phase, the Improved Oil Recovery (IOR) methods are bringing advanced technological solutions to boost oil recovery from mature fields, geologically complex low permeable and fractured reservoirs in the future. Among the IOR techniques, horizontal wells appeared to be a promising one in both short and long term of reservoir life. Horizontal well (HW) has a higher productivity and pay contact as increase the length of well, thereby reducing the number of wells required to drain the reservoir. In the case study presented, the efficiency of horizontal well will be evaluated by analyzing horizontal well performance. Both analytical and numerical solutions will be investigated. A 3D numerical model of the South-East Dragon field was set up with five production wells and one injection well that is known as a base case. Then running base case is to find the appropriate places for putting new well. Ten interesting scenarios are presented in this paper where the horizontal well is analysised both HW location sensitivities and HW length sensitivities. In addition, this research described a step-by-step procedure that can be used when performing an economic analysis of a horizontal well project. The results from the case study indicate that a combination of factors including total economic, analytical and numerical simulation is required to optimum horizontal well length in the fractured basement reservoir of South-East Dragon oil field in Viet Nam.
Applying the methods of enhanced oil recovery (EOR) for oil and gas fields has always many risks of economic and technology because EOR projects are influenced by many characteristic factors of the reservoir such as structure of reservoir, reservoir formation, geological properties, parameters of reservoir engineering, production technology to EOR application. Some EOR methods have been successfully applied in the world, but when these methods conduct in specific reservoir with different geological characteristics, tight production conditions have resulted in failures and ineffective economic, even caused dreadful aftermath to be handled in operations. Researches, evaluations and EOR applications in Vietnam are limited and only carried out on a laboratory scale. Therefore, the ability to be applied the EOR modern technology with a large scale or full field still faces many difficulties and the feasibility of projects is not high enough. The authors have been analysed all EOR projects successfully that applied many oil and gas fields in the world and then building EOR database. Based on EOR database, a study has been conducted on statistical analysis to build EOR screening criteria for reservoir parameters from past to now. The study also combined in-depth analysis algorithms such as Fuzzy, K - mean, PCA Artificial Intelligence to screen the optimal EOR method for sandstone reservoirs of Cuu Long Basin.
After several discoveries of oil and gas in fractured basement reservoir such as White Tiger, Dragon, Aurora and Ruby in 1990s, the basement on the continental shelf of Vietnam has become a major target for domestic and foreign oil companies. Oil produced from basement is accounted for more than 90% of the total produced oil. Despite of lesser and lesser new discoveries and most of the big oil fields are in declining phase, fast economic growth of Vietnam needs more energy. Among the Improved Oil Recovery (IOR) techniques, horizontal wells appeared to be a promising one in both short and long term of reservoir life. Horizontal wells have a higher productivity and pay contact per well than that of vertical wells, thereby reducing the number of wells required to drain the reservoir. Horizontal wells allow operators to take advantage of highly heterogeneous reservoirs, especially those with fractures, or water and gas coning problems. As an injection well, a long horizontal well provides a large contact area, and therefore enhances well injectivity, which is highly desirable for enhanced oil recovery (EOR) applications. In this study, the efficiency of horizontal well will be evaluated by analyzing horizontal well performance. Both the advantages and disadvantages will be compared with those of vertical well. In assessment of the efficiency of horizontal well, both analytical and numerical solutions will be investigated.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.