Projects/Case Studies


SOLV is an engineering consultancy company specialising in Oil & Gas flow measurement and allocation systems. We undertake engineering studies to select and specify metering systems, design allocation systems and estimate measurement uncertainty. SOLV pioneered the use of MCS (Monte Carlo Simulation) to estimate the uncertainty of Oil & Gas measurement equipment and allocation systems.

Further details of projects can be downloaded here.

Case studies for three recent projects are described below.


Case 1 - Allocation Philosophy and Uncertainty, Algeria

Requirement

Specify the allocation philosophy and determine the uncertainty for allocation of Crude Oil, Condensate and LPG for two Crude Oil fields, a Gas Condensate field and an NGL import.

Solution

Mass component allocation was selected as there was no recycle to the reception slug catchers and all vapour liquid exchange and gas disposal could be measured. The allocation uncertainty for each field and field owner was found by MCS (Monte Carlo Simulation) with a 23 component mass component allocation model of the plant. Mass component allocation eliminates much of the uncertainty found with the alternative process simulation or shrink and flash adjustment allocation methods.


Case 2 - Heavy Oil MPFM Allocation, Alaska

Requirement

Estimate the oil phase measurement uncertainty for a MPFM (Multi-Phase Flow Meter) on the liquid leg of a slug catcher with high viscosity, tight emulsion and entrained gas.

Solution

A model of the MPFM phase detector and flow element was developed for 0-50% GVF and 0-50% WLR with liquid viscosities 50-3,000 cP, using a Re (Reynolds number) Cd (Coefficient of Discharge) correction. The phase detection uncertainty was found with MCS and the flow element using RSS (Root Sum Square) methods. The model was run for three flow element sizes each with 24 cases to provide an uncertainty matrix for the allocation tariff adjustment.


Case 3 - MOL and Terminal Measurement Survey, Oman

Requirement

Investigate the terminal balance for the MOL (Main Oil Line), storage tanks, refinery supply and returns, and sea tanker loading. Survey each MOL entry meter at 41 locations to estimate the regional and pipeline balance and uncertainty.

Solution

The project was undertaken in three stages comprising terminal balance, pipeline balance and analysis of the regional balances. The terminal balance uncertainty was examined and the uncertainty estimate used to provide a balance acceptance criteria for daily, weekly and monthly reporting. The MOL import meter was compared with a pipeline meter in the interior and calibrated using storage tanks for use in the terminal balance.

MOL meters in the interior were surveyed for the three regions comprising LACT units with a  prover and PD or turbine meter, uncompensated orifice with (square, conical and quadrant) meters, venturi, vortex, coriolis, ultrasonic (single, multipath and clamp on) and storage tanks at each location. An allocation model for the MOL and terminal was developed to find the allocation uncertainties and pipeline balance uncertainty using survey findings. 


Further details of the projects can be downloaded here.

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