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PESA QLD: Technical Luncheon, 20th June – David Lowry

Thursday, June 20 @ 12:15 - 14:00

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Guest Speaker: Mr David Lowry

David Lowry has an MSc (Hons) from Auckland University and has worked as a field geologist for Geological Survey WA, as a well site geologist, and as an exploration geologist for WAPET, Lasmo, Sagasco and Origin Energy. He now consults from his home in the bush.

Particular interests are prospect risk analysis, seals, geochemistry, and hole stability. Peripheral interests have included speleology, ocean cruising and redclaw aquaculture.

 

This month, PESA QLD have teamed up with the Formation Evaluation Society of Queensland (FESQ) to welcome Mr David Lowry to provide a technical examination of borehole Bottom Hole Temperatures.  Bottom Hole Temperatures (BHTs) are often recorded in Well Completion Reports, however there is more complexity than is immediately apparent if you want to try to make exploration sense out of this valuable parameter.
Mr Lowry is a frequent attendee at PESA events, and also a frequent presenter to the PESA QLD community.  PESA QLD is certain that this presentation will prove to be as informative and interesting as Mr Lowry’s previous offerings.

This technical lunch is held in conjunction with the Formation Evaluation Society of Queensland (FESQ).
FESQ members qualify for member discounts, see ticket options below for details.

The Technical Lunch will be held at the Brisbane Hilton Hotel, in the “Victoria’s Room” with access from the Hilton Main Foyer on level 6.
For detailed directions, see explanation below.
Please note the new Early Bird ticket pricing cutoff times described below.

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Presentation:
Temperature Matters! Pitfalls and solutions for bottom-hole temperatures
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Venue:
Hilton Hotel Brisbane, 190 Elizabeth Street, Brisbane QLD 4000
Victoria’s Room, Access from Level 6. (Detailed directions below)
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Date & Time:
Thursday, 20th June 2019,    12:15 pm
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Presentation Abstract:
Bore-hole temperature is a useful but problematic measurement. Problems include uncertainty with the depth associated with the measurement; information on the time spent circulating at thermometer depth; and time since circulation stopped prior to measurement. As a consequence, there are many errors in the recorded data of bottom-hole temperature in databases, and no context about how the temperature reading was recorded. This presentation looks at how static temperature can be estimated from a single bottom-hole temperature reading and makes some recommendations for recording bore-hole temperatures moving forward.
Modern exploration relies on petroleum system modelling, and calibration of such models relies on a good estimate of equilibrium borehole temperature. Errors in temperature estimates can have a big impact on modelled generation.
Wells are not in thermal equilibrium when evaluated by DSTs and wireline logging. A Drill Stem Test record can be a reliable source of temperature data, but is likely to be an underestimate if the test follows a common Cooper-Eromanga practice and was conducted prior to logging. Horner plots are the industry standard where multiple logging runs are made over several hours at the same depth. However I identify eight sources of likely error. Modern logging tools have a digital readout of temperature from an electrical sensor. The trend of such logs usually shows an enigmatic ‘hook’ at T.D. Understanding the thermal time constant of the sensor is key to understanding the ‘hook’ and in making use of the data.
Modern wells are commonly evaluated with a single logging run, and an algorithm is offered here to estimate equilibrium temperature from a single measurement in Cooper Eromanga wells.

Tickets for the Technical Luncheon can be purchased below.

Please be advised of the early bird cutoff date.
Early bird pricing will remain available up until Wednesday 12th June, 5:00 PM after which, standard pricing will come into effect.

Early Bird Ticket Price Standard Ticket Price
PESA/FESQ Members – $55
Non-Members – $75
Student / Retired Members – $30
PESA Members – $75
Non-Members – $95
Student / Retired Members – $30

Registrants may elect to book a ‘Talk Only’ ticket below.  Chairs will be made available at the back of the room for members wishing to attend the presentation.
Talk Only tickets are free of charge, however, no refreshments or lunch is included.

 

Victoria’s Room can be accessed by two means.  Detailed directions are below:
1) Entry from Queen Street Mall
Enter the lifts located just to the left of Mick O’Malley’s Irish Pub, and take the lifts to Level 6.  Once you exit the lifts, Victoria’s Room is immediately to the left.
2) Entry from Elizabeth Street
Enter the foyer located on 190 Elizabeth Street, and take the lifts to level 6 (Main Foyer).  Victoria’s Room is located in the back of the main foyer towards the right as you walk past Vintaged Restaurant.


Details

Date:
Thursday, June 20
Time:
12:15 - 14:00

Venue

Hilton Brisbane City
190 Elizabeth Street, Brisbane QLD, Brisbane 4000 Australia

Organizer

PESA QLD Branch
Ticket Type Name Price Quantity