With deeper waters, longer distances and harsh environments, oil and gas production face more challenges including hydrate management, slugging, wax deposition, scale build-up, asphaltene precipitation, erosion and gel formation.

At GATE, we take Flow Assurance engineering and modeling to operations. By using a systems engineering approach, GATE addresses the challenges from modeling to development of operational strategies to optimize flow assurance engineering in the subsea production system.Flow Assurance Modeling is a key aspect of engineering design work, especially in deepwater oil and gas developments. Several issues impact the flow of oil and gas from the sandface (near wellbore area) to the platform and through the export systems including slugging, hydrate management and formation, scale formation, wax buildup, corrosion, erosion, asphaltene deposition and gel formation.

At GATE, Flow Assurance engineering and modeling is designed to assist in project decision making, especially in the following areas:

  • Production and Reservoir Engineering
    • Fluid Characterization (Oil, Gas, and Water), Production Profiles, Reservoir Pressure Behavior, Well Completions Requirements, Field Architecture Selection and Well Configurations and Optimization
  • Chemical Systems
    • Chemical Injection Systems, Chemical Qualifications and Screening, and Umbilical Requirements
  • Materials Engineering
    • Materials Selection and Requirements
  • Production Chemistry
    • Fluid Compatibilities, Emulsion Treatments, Foaming Control and Produced Water Treatment
  • Integrity Assurance
    • Corrosion Modeling, Erosion Modeling, Scale Modeling, and Souring Modeling
  • Process Design
    • Topsides Requirements based on Transient Flow Modeling and Production Chemistry
  • Operations and Procedure Development
    • Operating Guidelines and Specialized Procedures based on Steady‐state & Transient Flow Modeling

Flow Assurance engineering from modeling to operations requires seasoned professionals that understand the subject, the needs of the clients and the project challenges to optimally design operational strategies with the use of the state of the art modeling tools such as OLGA® Modeling Multiphase flow transient simulator.

GATE Flow Assurance Engineers focus on:

  • Multiphase Flow ModelingSteady-State and Transient Modeling of Operations
    • Line Sizing and Thermohydraulics Studies
    • Shut-In, Start-Up, Restart, Ramp-Up/Down, Gas Lift
    • Water Hammer and Pigging Studies
  • Rigorous Choke Modeling
  • Integrating Production Chemistry to Flow Assurance Related Issues
  • Design Operational Guidelines and Procedures

Key Projects Involving Flow Assurance

At GATE, we take Flow Assurance modeling to operations by using a systems engineering standpoint addressing the challenges from modeling to development of operational strategies to optimize the subsea production system.

BP – Juniper Flow Assurance Strategy

GATE is responsible for formulating a detailed flow assurance strategy for the successful operation of Juniper production system. The project involves extensive cross-functional interaction, detailed study of the lessons learnt from similar fields in the region (offshore Trinidad), simulating a wide variety of what-if scenarios (both steady state and transient) to draft the flow assurance strategy and operability logic for optimized production.

Maersk – Chissonga Hot Oil and Pigging Operations Strategy

GATE was involved in formulating the strategy for hot oil circulation and pigging operations for Chissonga.

The hot oil circulation study involved optimization of the hot oil injection pressures and temperatures required to displace the cold dead leg in the pigging loop following an extended shutdown.

The pigging study involved optimizing the pigging frequency, topsides injection pressures and pig velocities taking into account the production function for the entire life of the field.

BP – Mardi Gras Steady State & Transient Modeling

The project involved detailed steady state and transient modeling and analysis of gas and oil production systems. Strategies were developed for pigging based on the liquid dropout pattern and fluid velocities.

Phase envelopes of the individual gas streams and gas-mixtures were studies in detail using the software PVTSIM and optimum operating pressures and temperatures were suggested to minimize the liquid drop out.

Noble Energy – Aseng FPSO Asset Modeling

GATE was responsible for the flow assurance modeling to support Detailed Engineering, Final Commissioning & Start-up and Operations Readiness for the Aseng Development. This included steady-state and transient modeling of the production, gas injection, and water injection systems.

The modeling encompassed all areas of the system and included topics such as cooldown assessments, blowdown modeling, flowline heating operations, cold-earth start-ups, service line operations via trees and manifolds, gas injection well flowback modeling, water injection surge analysis, water injection virtual metering, injection well injectivity modeling, wellbore cooldown analysis, and others.

TULLOW – Jubilee Remediation of Hydrate Plugs

GATE was approached by Tullow to provide a detailed view of the several options available in the industry for remediation of hydrate plugs in oil and gas lines, merits and demerits of each strategy and their applicability to the Jubilee field. The project also involves developing detailed procedures for hydrate remediation/removal for Jubilee considering the available topsides and subsea infrastructure.

BP – Marlin Gas Export Line Modeling

GATE was involved in performing studies on the gas export line at different flowrates and platform pressures using the transient analysis software OLGA®. This includes calculation of the gas compressor requirements considering the characteristic curves and limitation on the compressor power) was calculated for a fixed export pipe ID.