PVT Analysis - Step 1 - gathering lab report

Typical PVT lab report content looks like this:

Table of Contents
		page
	Table of Contents.....................................................................	i
	Executive Summary (Sub-surface Oil)..................................	ii
	General Well Information........................................................	1
	Sample List...............................................................................	2
	Summary of Validation Data...................................................	3
	Bubble Point of Sample X.......................................................	4
	Bubble Point of Sample Y.......................................................	5
	Subsurface Oil Composition - Sample X.............................	6-8
	Subsurface Oil Composition - Sample Y.............................	9-11
	PVT Analysis (Chosen Sample)
	Constant Composition Expansion at (Tres)........	12-14
	Differential Liberation at (Tres)
	Differential Liberation Physical Volumetrics...................	15-20
	Evolved Gas Properties.......................................................	21
	Equilibrium Liquid & Material Balance.............................	22
	Viscosity at (Tres)..................................................................	23-24
	Multi-stage Separator Test
	Separator Test Physical Volumetrics...............................	25-27
	Separator Gas Compositions............................................	28
	Stock Tank Liquid Compositions & Material Balance...	29
	Database of Molecular Weights & Densities......................	30

PVT Analysis - The workflow

The workflow for a PVT analysis (Fluid Characterization) is as follows:

Step 1: PVT Data Gathering

Step 2: Fluid samples' QC and validation

Step 3: PVT group identification and representative sample selection

Step 4: Fluid model construction and matching

Step 5: Selecting industrial PVT correlation that represent the reservoir fluid

Step 6: State your recommendation - which fluid sample is valid, which one is not, which one to use for reservoir modeling etc. 

Unconventional Hydrocarbon Resource - future's hope?

Learnt from an oil & gas business journal yesterday that,
By 2030, the world population is estimated to become 8 billion - current population is about 6 billion people.
60% of the population lives in mega cities - which puts more strain on energy demand.
Global energy demand is estimated to increase by 1/3 from 2010 to 2035.
Conventional oil are fast depleting.
Gas will become major source of energy by Year 2030.
Nearly half of the increase in natural gas production by then will be from Unconventional Gas Resource - mainly from the US, Australia, and China.

So, Oil & Gas industry will still be the backbone of world's economy for many more years to come, I guess till some genius could make water or air or plants to replace oil/gas as main energy resource :)
Go Unconventional peeps?

Vacation next year :):):)

2 nights ago, my husband bought tickets to Adelaide, Australia! Yeayy!
We bought them from @airasia.com, the budget airplane company just lauched their first flight to Adelaide so they are offering crazy promotion.
We got return tix at RM500/person / approx. USD167/person (Kuala Lumpur-Adelaide-Kuala Lumpur).
The trip will be in March next year - looks like we'll be celebrating our 2 sons birthday there :)
Adelaide will be the 6th Australia's major city we visit.
*we are budget traveller so we buy flight tix many months ahead - usually from the 'Now Everyone Can Fly' :)

First note of this blog

I've been a Reservoir Engineer for slightly over 6 years now. Been with the current Oil & Gas company for over 8 years.
After my maternity leave in May, I was given my 4th field to work on, apart from the field I've been working on before the maternity leave.
New project always excite me. This new project is an oil field, just started production about 3 years ago.
My task is to construct a new dynamic model for the field, incorporating data acquired from development wells and production data. This numerical simulation model should (note: should) be more representative than the pre-development, pre-production model as more data had been acquired from the drilling campaign onwards.
Personal challenge for me in this project:
1. This will be the first time I'll be constructing a numerical simulation model (dynamic model) from scratch.
2. The pre-development model was already a good, representative model. It was built my a darn good reservoir engineer, a colleague of mine. The reason the model needs to be updated is because we got new data from development drilling and production. Another strong reason is because the pre-dev model was pessimistic than actual condition (it predicts water-breakthrough should have started by last year, but in actual those well that was forecasted to water-out by now are still producing good clean oil). For a hydrocarbon field, this is good news. (bad news is when simulation model predict wells still produce good clean oil but in reality the wells have been watered-out). So boss wants a simulation model which imitate the actual production in closer accuracy.

I'm scared and excited at the same time.

I've jotted down the to-do list for this field. For the next several months, the tasks gonna be:
1. Fluid Characterization Analysis (PVT Analysis)
2. Rock properties Analysis
3. Pressure Plot and pressure trending
4. QC production data
5. Read the Post-Drilling Report and extract necessary data

I'm still on item No. 1 , so today I'm going to continue the PVT analysis.
Just 3 samples (I've worked on 10 for another oil field before) - but my pre-liminary analysis on all 3 indicates that the lab result does not meet the actual well test data *sigh*.

Anyway, with each challenge comes creativity. So we'll figure out the best way to cope, I know we will :)