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research-article

INVESTIGATIONS ON OILWELL CEMENT STRENGTH RESPONSE TO ULTRASONIC MEASUREMENTS IN PRESENCE OF ADDITIVES

[+] Author and Article Information
Niklas Romanowski

TU Clausthal, Clausthal-Zellerfeld, Niedersachsen, Germany
niklas.romanowski@tu-clausthal.de

Adonis Ichim

The University of Oklahoma, Norman, Oklahoma, USA
adonis.ichim@ou.edu

Catalin Teodoriu

The University of Oklahoma, Norman, Oklahoma, USA
cteodoriu@ou.edu

1Corresponding author.

ASME doi:10.1115/1.4039316 History: Received July 22, 2017; Revised January 03, 2018

Abstract

Ultrasonic cement measurement became a very popular method to assess the mechanical properties of the cement in a non-destructive manner. Since various measurement systems exist on the market, the development of an accurate reference data base that can be used to calibrate such measurements becomes very important. Two major systems have therefore been compared: the ultrasonic compressive strength, using the ultrasonic pulse velocity (UPV) principle, and the unconfined compressive strength (UCS), using the standard testing frame according to API and ASTM standards. The tests have been performed at different curing times, using both devices, on class G API cements with bentonite and other additives. This paper presents the results of over two hundred experiments that have displayed a different UPV response as a function of the additive content. These allow us to expand the existing UPV vs. UCS correlations. Moreover, it was observed that after a given curing time, depending on the additive and its concentration, the UPV response is not as sensitive as the results yielded by the UCS method. The outcomes are an important step forward to improve and understand the wellbore integrity.

Copyright (c) 2018 by ASME
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