Pipesim Simulation < HOT 2024 >

In common industry usage, "drafting" refers to the visual construction of the simulation model.

Single-Line & Double-Line Representation: Users "draft" their networks using standardized symbols to represent wells, flowlines, and equipment.

Visual Network Design: Before running simulations, the user drafts the physical layout (source to sink) including the reservoir, completion, and wellhead configurations. 2. "Draft" in Proposals and Reporting

Technical consultants and systems engineers often use PIPESIM data for proposal drafting and documentation.

Machine Learning Workflows: Engineers may draft preliminary models to filter and transform high-dimensional data from PIPESIM for use in external machine learning or predictive models. pipesim simulation

Conceptual Stage Modeling: In offshore projects, "draft" versions of models are used during the conceptual design phase to determine capital costs and bottleneck possibilities before final execution. Summary of Key Simulation Features

While you are drafting your model, you will likely interact with these primary functions:

Steady-State Multiphase Simulation: Modeling pressure drops and phase behavior in gathering networks.

Inflow and Vertical Lift (IPR/VLP): Assessing well performance and artificial lift scenarios. In common industry usage, "drafting" refers to the

Sensitivity Studies: Running preliminary "draft" iterations to test variables like tubing size, water cut, or gas-liquid ratios.

2. Pipeline Network Debottlenecking

Consider a gathering system with 15 wells feeding into a central facility. Pipesim simulation allows you to add a new well virtually. You see the back-pressure effect: adding 10,000 bbl/d might choke existing wells. The simulation tells you if you need a new loop line or a larger trunk line.

2.1 Nodal Analysis

The core concept in PIPESIM is nodal analysis—selecting a "node" (e.g., bottomhole, wellhead) and solving the inflow and outflow equations simultaneously.

Inflow Performance Relationship (IPR): Flow from reservoir into the wellbore (e.g., Vogel’s equation for solution-gas drive reservoirs).
Outflow (Vertical Lift Performance - VLP): Flow from bottomhole to surface, accounting for friction, hydrostatic head, and acceleration losses.

Step 1: Data Gathering

Collect the following:

Well deviation survey (MD/TVD).
Fluid PVT (gas-oil ratio, water cut, API gravity, gas gravity, viscosity).
Reservoir pressure and temperature.
Tubing and casing specifications.
Separator pressure and temperature.

Key Applications of Pipesim Simulation

The versatility of Pipesim simulation allows for its application across the entire oilfield life cycle.

2. Well Performance and Nodal Analysis

PIPESIM utilizes Nodal Analysis to look at the inflow from the reservoir versus the outflow performance of the wellbore. By matching these curves, engineers can determine the optimal choke size, tubing diameter, and artificial lift method (like Gas Lift or ESPs) to maximize production.

Steps Performed in PIPESIM

PVT model: Black oil – dead oil viscosity, solution GOR, formation volume factor.
IPR: Using Vogel with ( P_r = 3000 ) psi, ( J = 0.8 ) bbl/d/psi.
VLP: Hagedorn & Brown correlation (vertical).
Nodal analysis at bottomhole:
- Current operating point: 480 bbl/d (IPR and VLP intersect at 480 bbl/d).
- System is tubing-limited (VLP curve is too high).

The Mathematical Engine: How Pipesim Calculates Flow

To truly leverage Pipesim simulation, one must understand the physics behind the GUI. The software solves the conservation of mass, momentum, and energy equations.