Data underlying the research of Performance Evaluation of Low-grade Calcined Clay as a Supplementary Cementitious Material for Sustainable Oil-well Cementing 

Author: 
Solomon Adumatta 

Affiliations: 
Council for Scientific and Industrial Research  Building and Road Research Institute (CSIR-BRRI); Kwame Nkrumah University of Science and Technology (KNUST) 
 
Contact Information: 
Email: adumattasolomon6@gmail.com

C/O CSIR-BRRI 
P.O. Box UP 40, KNUST  
Kumasi  Ghana. 


General Introduction 
This dataset contains data collected during calcined clay evaluation as supplementary cementitious material in oil-well cementing experiment in Kwame Nkrumah University of Science and Technology (KNUST), as part of Solomon Adumattas MPhil Chemical Engineering Thesis project. 
 
It is being made public both to act as supplementary data for publications and in order for other researchers to use this data in their own work. 

Slurry design, mixing, and sample preparations of 50 mm cubic hardened samples that were used to derive compressive strength data in this dataset were prepared in accordance with API specifications 10A and recommended practices 10B-2 at the Petroleum Engineering Laboratory of Kwame Nkrumah University of Science and Technology (KNUST), and tested for compressive strength at the Civil Engineering laboratory of KNUST. 

Characterization of materials which includes specific gravity testing, Blaines fineness (specific surface area), loss on ignition (LOI) and insoluble residue tests were conducted at CSIR-BRRI. XRD test on Dyckerhoff HSR class G cement was conducted at theKumasi Regional Water and Sanitation Centre (RWESCK) laboratory at KNUST. Analysis of XRD data to obtain cement composition was conducted with the Profex software by Prof. Mark Bediako of CSIR-BRRI. XRF results on materials which shows chemical oxide compositions were obtained from the XRF laboratory of the Earth Science Department of the University of Ghana (UG), Legon - Ghana.

Experimental data visualizations were conducted with Microsoft Excel. 

This research project was made possible by a grant from the Office of Grants and Research (OGR) through the KNUST Research funding program (Kref). 

Purpose of the test campaign
The purpose of these experiments was to develop a sustainable oil-well cement by supplementing high volume of locally available low grade kaolin calcined clay which has comparable or superior slurry properties by evaluations in terms compressive strength in distilled water and simulated North Sea saline environment (synthetic formation water), lower CO2 emissions and lower environmental impact through Life Cycle Assessment (LCA).


The potential of utilizing locally available calcined clay as supplementary cementitious material for sustainable oil-well cementing was evaluated. 50 mm cubic slurry samples were subjected to different curing media of temperature 70 C in distilled water and in synthetic formation water conditions and evaluated for compressive strength. Experimental measurements and test results are detailed in "Calcined clay oil-well cement datasets.csv". 

Test equipment
Compressive strength test was conducted with a universal compression and tensile testing machine (UTM). The maximum loads and maximum strengths of test samples were measured by the UTM and used for data analysis.

Description of the data in this data set
The data included in this data set has been organised per specimen.  

Abbreviations:
FCU = Compressive strength 
FW = Synthetic formation water
S.D/ STD. D = Standard Deviation
%RSD = Percentage relative standard deviation 
VAR = Variance
Pozzo/ CC = Calcined clay
LCA = Life Cycle Assessment
EC = Total carbon emissions
CMQ = Quantity of slurry constituent
Tkm = Transportation distance in km
EEC = Embodied carbon coefficient of constituent
XRD = X-ray diffraction spectroscopy
XRF = X-ray fluorescence spectroscopy

Slurry IDs:
GC/ 0 %CC = Pristine class G oil-well cement slurry (control)
CC10/ 10 %CC = 10 %bwoc calcined clay supplemented slurry 
CC20/ 20 %CC = 20 %bwoc calcined clay supplemented slurry
CC30/ 30 %CC = 30 %bwoc calcined clay supplemented slurry
CC40/ 40 %CC = 40 %bwoc calcined clay supplemented slurry
CC50/ 50 %CC = 50 %bwoc calcined clay supplemented slurry
CC60/ 60 %CC = 60 %bwoc calcined clay supplemented slurry
CC70/ 70 %CC = 70 %bwoc calcined clay supplemented slurry
CC80/ 80 %CC = 80 %bwoc calcined clay supplemented slurry

Note; bwoc = by weight of cement
