Petrovietnam Journal

The potential of surface-modified silica nanoparticles for enhanced oil recovery under the basement reservoir conditions of the Bach Ho field

Vu Anh Phan — 2022-12-27

Since the peak in 2002-2003, the annual production of Bach Ho - the largest oil field of Vietnam has decreased from more than 10 million tons to about 2 million tons. To ensure the production in the current decline period, studies and applications of technologies to enhance the oil recovery efficiency become critically urgent for the basement reservoirs that contribute the highest proportion to the output of Bach Ho field.

The paper focused on the potential application of nanotechnology in the enhanced oil recovery (EOR) for the Bach Ho field. The main experimental results of the nanofluid for EOR in which surface-modified nanosilica were combined with surfactants for the basement reservoir condition were also presented in this study.

Analysis and selection of the optimal exploitation regime of the Bach Ho field

Nguyen Hung Dao — 2022-12-27

Fractured basement reservoir is an important exploration and exploitation object for Vietsovpetro in particular and Petrovietnam in general. Since the discovery and putting in production of the Bach Ho field fractured basement reservoir in 1988 until now, studies on this special object have been carried out regularly and seriously. However, the fractured basement is still a complicated object, bringing many challenges to the team of geologists and reservoir experts.

During the nearly 35 years of exploitation, a series of reservoir engineering solutions are continuously studied, applied and adjusted to ensure the optimum exploitation regime. Currently, the fractured basement reservoir is in its stage of production decline, the analysis and selection of the optimal exploitation regime is thus very important to secure the highest efficiency of exploitation and oil recovery.

The article summarises the main reservoir engineering solutions that have been applied, analyse the basis as well as results of injection regime adjustment in the recent years (2018 - 2022) and propose the appropriate exploitation regime in the future.

Inorganic scale formation and well treatment methods in oil production wells in Cuu Long basin

Long Hoàng — 2022-12-27

Deposition on tubing, downhole equipment is mainly caused by formation of inorganic scale. Inorganic scale formation often occurs in production wells having high production rate, high water-cut and severe pressure loss through perforations and at the near-wellbore region.

In the study conducted by Vietnam Petroleum Institute (VPI), the mechanism of carbonate and sulfate scale formation within the reservoir and near-wellbore region due to mixing incompatible of water sources and over-saturation condition is investigated. Hydrodynamic changes, particularly sudden drops in pressure from the reservoir into the well, leading to inorganic precipitation in the reservoir/the well tubing/equipment, were studied.

The results proved that hydrodynamic change in the near-wellbore is the main cause of the carbonate-based inorganic scale formation. Several acid-based solutions that have high scale dissolving effect to restore or increase the production rate are presented. Based on the actual inorganic deposition mechanism in the production wells, impact determination measures and treatment methods have been studied for applications in Cuu Long basin.

The possibility of integrating green hydrogen into Ca Mau Fertilizer Plant

Duong Hai Le — 2022-12-27

The trend of energy transition, reduction of greenhouse gas emissions reduction and production of green products production including green hydrogen is strongly developing in the world and is expected to grow in Vietnam after 2030 when the Vietnamese Government implements mechanisms and policies to implement fulfill the commitment to achieve net zero CO₂ emissions by 2050.

According to VPI's research results, Ca Mau Fertilizer Plant can integrate the production and use of 10% green hydrogen to reduce natural gas consumption and CO₂ emissions with the total after-tax investment of about 3,209 billion VND (equivalent to about 137 million USD). In order for the plants to invest in production and use of green hydrogen, competing with gray hydrogen, it is necessary to have mechanisms and policies to promote the production and consumption of green hydrogen such as DPPA, carbon market and carbon tax policy, tax incentives in project construction investment.

Just energy transition partnership and challenges for Vietnam energy sector

Thi Thuy Hanh Dang — 2022-12-27

On December 14, 2022, Vietnam and the International Partners Group (IPG) launched a Just Energy Transition Partnership (JETP). The IPG members consist of Denmark, Germany, France, the European Union (EU), the United Kingdom, Japan, Italy, Canada, Norway, and the United States. After South Africa and Indonesia, Vietnam is the third country to have a JETP agreement.

This article introduces JETP and its main contents. In order to achieve the goals of the Paris Agreement in a timely manner while ensuring socio-economic efficiency and energy security in line with Vietnam's policies, the issues related to the development of JETP in Vietnam are also analysed.

Environment protection in oil and gas exploration and production activities, offshore Vietnam

Hong Diem Bui — 2022-12-27

Oil and gas exploration and production activities in Vietnam have contributed greatly to the economic development of the country. Besides, those activities also generate waste sources that affect the environment. Thanks to the synchronous implementation of pollution management and treatment solutions, so far the offshore Vietnam oil and gas exploration and production activities have not caused any significant adverse impact on the water environment, the sediment environment, the benthic community, and the air environment.

The article introduces waste sources and types of waste from offshore oil and gas exploration and production, and assesses the environmental control results in offshore Vietnam oil and gas exploration and production activities. On that basis, the paper also points out the obstacles in the process of implementing the Law on Environmental Protection [1], Decree No. 08/2022/ND-CP dated January 10, 2022 [2] for oil and gas activities.