Development of a Homogenous Cement Slurry Using Synthetic Modified Phyllosilicate while Cementing HPHT Wells
Abstract
:1. Introduction
2. Methods and Materials
2.1. Materials
2.2. Methods
2.3. Density Variation
2.4. Rheology
2.5. Compressive Strength Test
2.6. Permeability
3. Results and Discussion
3.1. Density Variation
3.2. Effect on Rheological Parameters
3.3. Effect on the Permeability
3.4. Comparison of the Synthetic Modified Phyllosilicate (SMP) with a Commercial Dispersant
4. Additional Cost to Prepare One Barrel of the New Cement
5. Conclusions
- 0.3% BWOC of SMP was found to prevent slurry segregation with density variation at the top and bottom of the cement column of 0.46% compared with a density variation of 4.78% for the cement incorporating the commercial dispersant.
- The CT scan imaging confirmed the homogeneous density distribution along the cement column for the samples incorporating 0.3% BWOC of SMP.
- The plastic viscosity, 10-sec, and 10-min gel strengths of the sample with the commercial dispersant and the sample with 0.3% BWOC of SMP are almost same.
- Addition of 0.3% BWOC of SMP increased the yield point of the cement slurry to 60.6 lbf/100 ft2 compared with 20.5 lbf/100 ft2 for the slurry with 0.25% BWOC of the commercial dispersant.
- Incorporating 0.3% BWOC of SMP decreased the permeability by 37.1% compared with the sample containing the commercial dispersant.
- Addition of both SMP and commercial dispersant decreased the cement compressive strength compared with the cement without dispersant. The sample with 0.3% BWOC of SMP has compressive strength of 43.9 MPa, which is still greater than the minimum acceptable compressive strength for an oil well cement matrix.
Funding
Conflicts of Interest
Abbreviations
HPHT | High-pressure high-temperature |
SMP | Synthetic modified phyllosilicate |
BWOC | By weight of cement |
CT | Computer tomography |
OWC | Oil well cement |
CS | Corn starch |
CMS | Carboxymethyl starch |
HPS | Hydroxypropyl starch |
API | American petroleum institute |
ComD | Commercial dispersant |
DV | Density variation, % |
PV | Plastic viscosity, cP |
YP | Yield point, lb/ 100 ft2 |
GS | Gell strength, lb/ 100 ft2 |
ppg | pound per gallon |
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Slurries | Cement | Water | Dispersion Agent | Silica Flour | Defoamer | Expandable Agent | Fluid Loss Controller |
---|---|---|---|---|---|---|---|
Base | 600 | 44 | 0 | 35 | 4.7E-07 | 1 | 0.75 |
ComD | 600 | 44 | 0.25 * | 35 | 4.7E-07 | 1 | 0.75 |
SMP1 | 600 | 44 | 0.1 | 35 | 4.7E-07 | 1 | 0.75 |
SMP2 | 600 | 44 | 0.2 | 35 | 4.7E-07 | 1 | 0.75 |
SMP3 | 600 | 44 | 0.3 | 35 | 4.7E-07 | 1 | 0.75 |
SMP4 | 600 | 44 | 0.4 | 35 | 4.7E-07 | 1 | 0.75 |
SMP5 | 600 | 44 | 0.5 | 35 | 4.7E-07 | 1 | 0.75 |
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Elkatatny, S. Development of a Homogenous Cement Slurry Using Synthetic Modified Phyllosilicate while Cementing HPHT Wells. Sustainability 2019, 11, 1923. https://0-doi-org.brum.beds.ac.uk/10.3390/su11071923
Elkatatny S. Development of a Homogenous Cement Slurry Using Synthetic Modified Phyllosilicate while Cementing HPHT Wells. Sustainability. 2019; 11(7):1923. https://0-doi-org.brum.beds.ac.uk/10.3390/su11071923
Chicago/Turabian StyleElkatatny, Salaheldin. 2019. "Development of a Homogenous Cement Slurry Using Synthetic Modified Phyllosilicate while Cementing HPHT Wells" Sustainability 11, no. 7: 1923. https://0-doi-org.brum.beds.ac.uk/10.3390/su11071923