Non-Portland Cement Slurry Development and Application for Ultrahigh-Temperature Geothermal Well with Supercritical Conditions

2018 ◽  
Author(s):  
Guido Di Martino ◽  
Andreas Ruch
Keyword(s):  
Portland Cement ◽  
Cement Slurry ◽  
Supercritical Conditions ◽  
Geothermal Well ◽  
Ultrahigh Temperature

Effect of Volcanic Rock Powder on Performance of Foamed Concrete

2014 ◽  
Vol 1033-1034 ◽  
pp. 887-891
Author(s):  
Kui Fan Su ◽  
Bo Jiang ◽  
Jiang Shan Lian ◽  
Pei Cheng Qin ◽  
Si Zhi He ◽  
...  
Keyword(s):  
Portland Cement ◽  
Volcanic Rock ◽  
Dry Density ◽  
Foam Concrete ◽  
Cement Slurry ◽  
Rock Powder ◽  
Foamed Concrete ◽  
Powder Addition ◽  
Powder Content ◽  
Curing Age

Foamed concrete is prepared by the use of volcanic rock powder and ordinary portland cement and by means of chemical foaming method. The chemical composition and morphology of volcanic rock powder are analyzed,and the effect of volcanic rock powder addition into the portland cement slurry on the properties of foamed concrete is discussed.The results that the properties of the foam concrete could be prepared by controlling the addition of the volcanic rock powder content is 20%, The Compressive strength is as high as 1.36Mpa. The thermal conductivity is 0.048W/(m·K) and the dry density is 254kg/m3 for 28 days curing age. The main compositions of volcanic rock powder is SiO2 and the volcanic rock has a large number of closed and open pores.

Evaluation of Lignosulfonate Based Retarders for Thickening Time as a Function of Dosage and Temperature

2021 ◽  
Author(s):  
Justin Montgomery ◽  
Timothy McNally ◽  
Jay Hunger ◽  
Sreedhar Subramanian
Keyword(s):  
Portland Cement ◽  
Time Response ◽  
Temperature Relationship ◽  
Optimal Dosage ◽  
Significant Finding ◽  
Cement Slurry ◽  
Temperature Range ◽  
Exponential Increase

Abstract The retardation of class H Portland cement using lignosulfonates was investigated in the temperature range between 54°C and 153°C. Lignosulfonates with varying extent of modification was used in the study, and the optimum retarder dosage and temperature range to achieve desired thickening time was identified for different lignosulfonate types (non-modified, modified and highly modified). In general, a linear thickening response was observed at low retarder dosage, while a near exponential increase in thickening time response was observed at higher dosages. Defining the retarder dosage temperature relationship is essential for proper cement slurry design for securing desired placement of cement slurry. A significant finding is that the thickening time responses trend from near linear at low dosages, transitioning to near exponential at higher dosages. The observed results varied depending on the extent of modification performed on the lignosulfonate retarder. Pure lignosulfonate retarders produce optimal dosage response from 54°C to 97°C. Modified retarders work best in the range of 97°C to 118°C. While highly modified retarders perform best in the range of 118°C to 153°C. Defining the retarder dosage temperature relationship is essential for proper cement slurry design for securing desired placement of cement slurry.

Effect of the hydration rate and microstructure of Portland cement slurry on hydrostatic pressure transfer

2019 ◽  
Vol 352 ◽  
pp. 251-261 ◽  
Author(s):  
Kaiqiang Liu ◽  
Xiaowei Cheng ◽  
Xianshu Gao ◽  
Xingguo Zhang ◽  
Xiaoyang Guo ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Portland Cement ◽  
Cement Slurry ◽  
Hydration Rate

scholarly journals Predictive Hydration Model of Portland Cement and Its Main Minerals Based on Dissolution Theory and Water Diffusion Theory

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 595
Author(s):  
Tianqi Qi ◽  
Wei Zhou ◽  
Xinghong Liu ◽  
Qiao Wang ◽  
Sifan Zhang
Keyword(s):  
Portland Cement ◽  
Cement Hydration ◽  
Diffusion Theory ◽  
Moisture Diffusion ◽  
Test Results ◽  
Cement Slurry ◽  
Element Analysis ◽  
Prediction Ability ◽  
Hydration Effect ◽  
Hydration Model

Efficient and accurate cement hydration simulation is an important issue for predicting and analyzing concrete’s performance evolution. A large number of models have been proposed to describe cement hydration. Some models can simulate the test results with high accuracy by constructing reasonable functions, but they are based on mathematical regression and lack of physical background and prediction ability. Other models, such as the famous HYMOSTRUC model and CEMHYD3D model, can predict the hydration rate and microstructure evolution of cement based on its initial microstructure. However, this kind of prediction model also has some limitations, such as the inability to fully consider the properties of cement slurry, or being too complicated for use in finite element analysis (FEA). In this study, the hydration mechanisms of the main minerals in Portland cement (PC) are expounded, and the corresponding hydration model is built. Firstly, a modified particle hydration model of tricalcium silicate (C3S) and alite is proposed based on the moisture diffusion theory and the calcium silicate hydrate (C-S-H) barrier layer hypothesis, which can predict the hydration degree of C3S and alite throughout the age. Taking the hydration model of C3S as a reference, the hydration model of dicalcium silicate (C2S) is established, and the synergistic hydration effect of C3S and C2S is calibrated by analyzing the published test results. The hydration model of tricalcium aluminate(C3A)-gypsum system is then designed by combining the theory of dissolution and diffusion. This model can reflect the hydration characteristics of C3A in different stages, and quantify the response of the hydration process of C3A to different gypsum content, water–cement ratio, and particle size distribution. Finally, several correction coefficients are introduced into the hydration model of the main mineral, to consider the synergistic hydration effect among the minerals to some extent and realize the prediction of the hydration of PC.

scholarly journals Engineered Fiber Based Lost Circulation Pill to Abridge Lost Circulation of Geothermal Well

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Apriyansah Toni ◽  
Astra Agus Pramana ◽  
Bambang Kustono
Keyword(s):  
Base Fluid ◽  
Trial And Error ◽  
Cement Slurry ◽  
Lost Circulation ◽  
Severe Loss ◽  
Geothermal Well ◽  
Flexible Fiber ◽  
Geothermal Wells ◽  
Surface Section ◽  
Cement Plug

<em>Loss circulation is a major problem and known as the biggest challenge during drilling and well construction.This can leadsto various consequences,such as stuck pipe, loss of material and time to combat the losses, and even losing the well itself. Severe loss circulation conditions are often met while drilling geothermal wells in Indonesia. Partial to total losses have start experienced since drilling the surface section. Cement plugs is one of the conventional methods to cure losses. Number of cement plugs differ from one well to another well. Even in some wells, number of cement plugs performed for loss circulation plug can be over 30 times with total of more than 4,000 barrels of cement slurry pumped. Solution other than basic loss circulation material and cement plug must be developed to optimize curing loss time. Engineered fiber base concentration which is include; Base Fluid, LCM and Solid Package was obtained from simulation, then trial and error in laboratory was conducted. Based on the final recipe, the control pill was able to hold pressure and not leaking, even when using 5 mm grid clearance. Additional combined stiff fiber and flexible fiber with concentration of 6 lbs/bbl sufficient to hold exessive loss circulation.</em>

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