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LWD Cement Evaluation and Depth Measurement Uncertainty. December 6 2018.

6th December 2018 @ 3:30 pm - 5:30 pm UTC+1

Date & Time: December 6, 15:30-19:00 CET (click to add to calendar)
Venue: KIVI Prinsessegracht 23, 2514 AP Den Haag (click for map)
Please Click to email with RSVP to info@dps-nl.org 1 day before event latest.

PDF for printing


Cement Evaluation with LWD Sonic: methodology description and comparison to conventional cement evaluation. (click for PDF)

Marcelo Cecena, Schlumberger

Historically, LWD Sonic has struggled to provide quantitative cement evaluation due to the interference between casing and LWD collar signals. However, recent developments in tool design provide significant attenuation to collar signals, lowering the interference effect and allowing the reliable use of casing signal to quantify cement bond. The methodology presented uses a summation model approach to analyze the attenuation of the casing and tool collar signal along an array of receivers from an LWD sonic tool, to extend the quantitative cement evaluation to the full range of bond index applicable in all types of casing and cements (Pistre et al., 2015). The results are compared to Wireline CBL to demonstrate the potential and limitations as an alternative to conventional cement evaluation.


Along-hole Depth Measurement And Reducing Uncertainty. (click for PDF)

Harald Bolt, ICT

Along-hole depth has remained a measurement disciple that most recognize as being important and necessary to get right. But it is invariably taken for granted, unless it is “wrong”. But few actually know what “right” means. And fewer understand where the responsibility for the success of the measurement lies. The along-hole depth presentation includes defining this responsibility, as well as a discussion of the measurement process, the correction methodology and the numerics, and how these can affect uncertainty of measurement results. The Way-point correction model will be explained, applicable to both wireline and drill pipe depth determination, and an example with be presented where the use of Driller’s Way-point Depth (patent applied) arrived at quantified uncertainty for drill pipe derived formation depths.


As usual all have an opportunity to socialise with fellow petrophysical professionals over drinks and snacks @ Café 2005, Denneweg, Den Haag

Doors will open for registration and coffee at 3:30 pm and the talks will commence at 4:00 pm. The social hour will begin at 6:00pm.


6th December 2018
3:30 pm - 5:30 pm UTC+1


Prinsessegracht 23
Den Haag , 2514 AP
+ Google Map


Dutch Petrophysical Society