A master’s student “Duaa Mahmood Abdullah” defended her thesis “Improve the cement materials properties by adding nano for drilling activity” on Thursday, December, 19th, at the conference room C/ Materials Engineering Department/University of Technology. The Committee included:
- Aseel Basim Abdul-Husayn/ University of Technology/ Materials Engineering Department as a chair.
- Assistant Prof. Sarmad Emad Ibraheem/ / University of Technology/ Materials Engineering Department as a committee member.
- Hamza Mustafa Kamal/ Mustansiriyah University / Materials Engineering Department as a committee member.
- Assistant Prof. Farhad Muhammad Othman/ University of Technology/ Continuous Education Center as an adviser.
- Assistant Prof. Alaa Ala-oldeen Abdul-Hameed/ University of Technology/ Materials Engineering Department as an adviser.
Abstract
Cement materials are important not only for modern structures and buildings in expanding urban environments and mega projects, but also for a variety of industries including the oil and gas production sector, specifically in drilling and completion operations. Proper slurry design is evolve from using smart cement to success of a cementing functions.
In this thesis a ball mill procedure was used to prepare a nanopowder from a cement dust waste material supplied by cement factory for reinforcing the oil well cement through using it as a partial replacement of oil well cement class G. The produced powder (CDNPs) was characterized by Particle Size Distribution (PSD), X-Ray Diffraction (XRD), Energy Dispersive x-ray spectroscopy(EDS), Scanning Electron Microscopy (SEM) and bulk density measurement.
The weight percentages of partial replacement were (0.25 to 1wt%) for CDNPs, ZnO nano rods (ZnONRs)and polypropylene micro fiber (PPMFs) with oil well cement with the same percentages. The addition of mixtures of ((CDNPs: ZnONRs), (CDNPs: PPMFs)) with a ratio equal to (0.25 to 1 wt %), the mix with a water to cement ratio for all samples was kept at 0.44.
The characterizations of the prepared samples were done, dry density ,porosity, compressive strength , free water and thickening time also done on these.
These experimental results showed that after the addition of these additives in cement mortar, the rate of increasing in compressive strength at 38 0C is (25, 37 ,31, 49, 43) % for cement mortar samples with (1wt %) (CDNPs, ZnONRs, PPMFs and mixture of(CDNPs: ZnONRs),(CDNPs: PPMFs), respectively, compared to the control sample and at 600C, the rate of increasing in compressive strength is (24 ,34 ,28% , 46and 37%) % for cement mortar class G samples with (1wt %) (CDNPs, ZnONRs, PPMFs, and mixture of(CDNPs: ZnONRs),(CDNPs: PPMFs), respectively , and the dry density of cement mortars mixed with these additives is higher than control cement mortar, where the rate of increasing in values of dry density is (8, 13, 15, 17.5 and 18.7) % for mortar samples with (1wt%) (CDNPs, ZnONRs ,PPMFs, and mixtures of the (CDNps: ZnONRs) and (CDNps: PPMFs))respectively, from the control sample. the porosity of cement mortars mixed with additives are decreased. The rate of decreasing in values of porosity is (19, 30, 32, 43, 44) % with (1wt %) (CDNPs, ZnONRs ,PPMFs, and mixtures of the (CDNps: ZnONRs) and (CDNps: PPMFs)) respectively.
These additions gives better results by reducing free water of slurry and act as accelerators on the thickening time of cement class G and experimental outcomes display that the mechanical ,physical and structural properties improved significantly with the development phase of calcium silicate hydration C-S-H that makes it proper as smart cement for the oil well applications.
Assistant Professor Ahmad Sultan Ali/ Alnahrayn University/ Civil Engineering Department reviewed and characterized the thesis by the methods of science, whereas Assistant Professor Sameer Ali Ameen/ University of Technology/ Mechanical Engineering Department reviewed the thesis linguistically to meet the style of English. Congratulations to the student on her graduation.
