Petrovietnam Journal

Simulation of 3d seismic illumination and its application in seismic acquisition survey design - dual-source configuration (flip-flop)

2025-01-22T17:43:41+00:00

An ideal seismic survey should produce an even seismic illumination on the subsurface horizons and adequately illuminate faults. Thus, in seismic acquisition survey design, simulated seismic illumination is usually among the first steps to perform. In this paper the authors discuss how to perform a 3D seismic illumination simulation on a model of the subsurface environment using the Ray tracing technology. The results of the seismic illumination process using the Ray-Tracing method (ray propagation model) for the study area generate various Illumination-related maps to help assessing and optimizing the effectiveness of any particular seismic survey configuration. The paper also applied this technology to models and real-field data with a dual-source (flip-flop) configuration, producing various illumination map results to illustrate the effectiveness.

Lessons learned in high-pressure high-temperature well completion in Vietnam

2024-12-30T02:07:28+00:00

Well completion operation in high-pressure and high-temperature (HPHT) conditions is a big challenge for both operators and service companies. These encompass all aspects in well construction and production operation such as drilling, completion, workover, IOR/EOR application, specialized equipment, etc. Effective risk management, cost control, deployment of skilled human resources for HPHT wells require managers and operators to approach in a way different from that used in conventional environment. The lessons learned from well completion operations in HPHT conditions, summarized from construction practices at gas fields in Nam Con Son basin offshore Vietnam, provide valuable insights and serve as a noteworthy reference for the design and execution of HPHT well completions in the future.

Study on applied technologies to propose solutions for enhancing hydraulic fracturing efficiency in tight sandstone reservoirs of the Cuu Long basin

2024-12-30T02:24:01+00:00

The main objective of this study is to evaluate hydraulic fracturing technologies applied in the oil fields of the Cuu Long basin to obtain lessons learned and propose solutions to improve the efficiency of hydraulic fracturing methods for the tight clastic formations therein. For that purpose, an assessment of representative hydraulic fracturing cases in oil production wells is conducted, focusing on well candidate selection, lithological composition, and reservoir rock properties for calculating geomechanical parameters and stress fields. Geomechanical models that simulate fracture development are compared to actual applications, namely in terms of effective treatment radius, required fracturing injection pressure, proppant size, injection pressure control processes, as well as flow return and well monitoring methods. The study also reviews modern and effective hydraulic fracturing technologies currently applied worldwide, particularly advanced geomechanical simulations, to accurately predict fracture networks, permeability, conductivity, the length, width, and height of fractures within productive fracturing zones. Based on the research outcome, solutions are proposed to improve the efficiency of hydraulic fracturing for the Miocene and Oligocene formations in the Cuu Long basin.

Evaluation of the applicability of subsea wellheads running by jack up rig for oil and gas exploration projects in shallow water, offshore Vietnam

2024-12-30T03:03:54+00:00

An overview of the oil and gas production in Vietnam reveals that certain major oil and gas projects, which account for large-scale operations and dominate the oil and gas production in the continental shelf of Vietnam, are entering a declining production phase. This affects not only the efficiency of individual projects but also the national energy security. Consequently, the research and application of new technical solutions to supplement and maintain oil and gas production become the most critical tasks in the current phase. However, based on the assessment of oil and gas potential in the basins on the continental shelf of Vietnam, few major offshore oil and gas prospects can be developed using conventional methods to achieve high economic efficiency. Therefore, two development concepts with the highest feasibility, both economically and technically, are: the development of marginal fields in shallow water conditions and the execution of exploration/production activities in new prospects at existing production projects by drilling additional infill wells and connecting them to the central processing platform (CPP).
The article evaluates the potential and proposes a solution using subsea wellheads & X-mas tree, operated by jack-up rigs, to develop marginal oil and gas fields in shallow water conditions and existing oil and gas fields with potential prospects located far from the CPP. This approach aims to reduce operational costs and enhance the overall efficiency of the project.

Production and optimisation of a well by hybrid artificial activation

2024-12-30T07:54:09+00:00

This paper focuses on proposing a hybrid activation mechanism for the production and optimisation of a well called X101 (for confidentiality reasons), which has become non-eruptive. Completion, pressure, volume, temperature (PVT), reservoir, and the X101 well profile data are processed by Pipesim and Excel software and integrating a certain number of calculations using nodal and decline curve analysis methods. The activation of the X101 well by an electric submersible pump (ESP) having 450 stages provided an oil production flow rate of 9189.329 stock tank barrels per day with a bottom-hole pressure of 2746.151 psi. Over time, the X101 well activated by the ESP having 450 stages faces a succession of maintenance operations occurring in very short time intervals following the reduction in the efficiency of the ESP. To overcome the problem of frequent maintenance which disrupts production times, the gas lift is added to the X101 well activated by a new ESP having 199 stages. The installation of the gas lift reveals that the adequate gas injection flow rate is 2 million standard ft3 per day and 2 valves must be installed at 4,959 ft and 3,966 ft to suitably meet the production requirements. The X101 well activated by the combination of ESP and gas lift delivered a production flow rate of 7954.601 stock tank barrels per day with a bottom-hole pressure of 2873.623 psi and its optimisation made it possible to obtain a net oil flow rate of 9,035 stock tank barrels per day at the bottom-hole pressure of 2,762 psi. The profitability of the X101 well activated by the combination of ESP and gas lift is USD 73,163,517 for a return on investment after 9 months and 22 days for 13 years of production.

Paraffin treatment of crude oil produced from the Central of Rong and Nam Rong - Doi Moi fields during transportation through uninsulated subsea pipelines

2024-12-30T03:35:47+00:00

Due to being developed in the early stages, several major oil subsea pipelines in Vietsovpetro Joint Venture are not equipped with insulation systems, causing significant difficulties in transporting high-paraffin crude oil. Specifically, the lack of insulation leads to intensive heat loss through pipeline walls, resulting in paraffin deposition on the pipe surface. Additionally, the temperature drop significantly increases oil viscosity, leading to high pressure losses during transportation.
This article analyses the difficulties in crude oil transportation through the uninsulated RP-1 → FSO-3 pipeline, the major route from Central of Rong, Nam Rong - Doi Moi fields to FSO-3 and presents the technical solutions that Vietsovpetro has researched and implemented to successfully resolve these problems.

Research and application of high-performance drilling fluid systems in Vietsovpetro Joint Venture

2024-12-30T04:09:34+00:00

Since 2015, starting with the KGAC system, the authors of Vietsovpetro have diligently researched and rationally combined conventional and modern drilling fluid (DF) systems. As the result, the KGAC was upgraded to the KGAC Plus. Then, during the testing and application of the KGAC and KGAC Plus systems to more than 100 wells, some adjustments to the system composition were made and KGAC Plus was improved to KGAC Plus M1. Particularly, Polyhib was used instead of NaOH and AKK to regulate the pH degree and prevent the clay from swelling. Not satisfied with the achievement, the Vietsovpetro team continued to study and test to advance KGAC Plus M1 to KGAC Plus M1*, which has greatly improved the drilling quality and efficiency at Vietsovpetro.

Quantitative assessment of a novel method for fluid thermodynamic test simulation in multicomponent systems

2025-01-20T17:43:15+00:00

This paper presents a quantitative methodology for simulating fluid thermodynamic tests, including constant composition expansion (CCE), differential liberation (DL), and separator tests, within multicomponent systems. The approach combines equilibrium ratios, flash calculations, and the Peng-Robinson equation of state. Utilizing the PVTp (Pressure - Volume - Temperature) package regression procedure enables the calibration of OmegaA and OmegaB values, enhancing accuracy and minimizing error margins in fluid thermodynamic calculations compared to empirical data. Numerical results demonstrate the effectiveness of this method. Bubble point pressure values from observed, software-generated, and calculated data are 2344, 2339, and 2350.42 psia, respectively. Calculated fluid thermodynamic test results closely align with software predictions and exhibit acceptable error levels compared to the measured data. However, discrepancies in the solution gas - oil ratio during the DL test highlight the need for more comprehensive measured data to improve simulation accuracy and reduce error margins. The comparison between the proposed methodology and collected data confirms the effectiveness of integrating equilibrium ratios, flash calculations, and the Peng-Robinson equation of state for precise fluid thermodynamic calculations. This approach offers a quantitative framework for simulating fluid thermodynamic tests, providing insights while reducing reliance on costly laboratory experiments.

Developing superhydrophobic/superoleophilic polyurethane sponge based on Fe3O4 particles for oil - water separation

2025-01-22T17:44:42+00:00

Recently, the issue of oil and organic spills, driven by a growing human population, has become a significant concern globally, including in Vietnam. Researchers are increasingly focused on developing materials that can selectively absorb oils and organic solvents while repelling water. This project aimed to develop an oil-absorbing material by integrating stearic acid-modified Fe3O4 or Fe3O4 particles into a polyurethane (PU) foam base. The results demonstrated that the modified PU sponge exhibited superhydrophobic properties, with a water contact angle exceeding 150°, and superoleophilic characteristics, with an oil contact angle close to zero. With excellent oil selectivity, the modified PU sponge achieved diesel oil absorption capacity ranging from 44 to 53 times its weight, depending on the particle loading concentration.

Governance in ESG of oil and gas sector

2025-01-22T17:44:16+00:00

ESG plays a vital role in modern business as it is a key for a company to build trust among stakeholders and access capital. On the one hand, investors look for companies having a good ESG practice to control and reduce potential risks. On the other hand, companies or investees should avoid “greenwashing” behaviors such as setting impractical targets in the name of sustainability, especially in high ESG risk sectors like oil and gas. For these reasons, governance (G) is the foundation of a company’s ESG, and it reflects the commitment of the top management level to achieving all ESG targets by managing risks, developing strategies and being transparent.