Preparation and characterization of core-shell oil absorption materials stabilized by modified fumed silica

2017 ◽  
Vol 37 (4) ◽  
pp. 391-399 ◽  
Author(s):  
Chun-yu Wang ◽  
Yu-huan Bu ◽  
Hua-jie Liu ◽  
Sheng-lai Guo
Keyword(s):  
Fumed Silica ◽  
Silica Shell ◽  
Alkali Resistance ◽  
Core Shell ◽  
Oil Well ◽  
Oil Absorption ◽  
Self Healing ◽  
Silica Wall ◽  
Well Cement

Abstract The core-shell oil absorption material (OAM) with fumed silica shell was achieved from Pickering polymerization. The modified fumed silica wall could well stabilize both Pickering emulsion and Pickering polymerization. The particle size of encapsulated OAMs decreased with the increasing concentration of fumed silica and remained unchanged when the concentration was more than 1 wt.%. This fumed silica shell had little effect on the oil absorption rate of OAM. The importance was that the shell reversed the surface property and improved the alkali resistance of OAM. We believe that our core-shell OAMs could reach the self-healing ability of the oil well cement.

scholarly journals Characterization of core-shell microstructure and self-healing performance of electrospun fiber coatings

Polymer ◽  
2016 ◽  
Vol 107 ◽  
pp. 263-272 ◽  
Author(s):  
Thu Q. Doan ◽  
L. Suzanne Leslie ◽  
Sang Yup Kim ◽  
Rohit Bhargava ◽  
Scott R. White ◽  
...  
Keyword(s):  
Electrospun Fiber ◽  
Core Shell ◽  
Self Healing ◽  
Shell Microstructure ◽  
Fiber Coatings

scholarly journals Development and Application of Novel Sodium Silicate Microcapsule-Based Self-Healing Oil Well Cement

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 456 ◽  
Author(s):  
Wenting Mao ◽  
Chrysoula Litina ◽  
Abir Al-Tabbaa
Keyword(s):  
High Temperature ◽  
Sodium Silicate ◽  
Crack Depth ◽  
Oil Well ◽  
Self Healing ◽  
Cement Pastes ◽  
Good Thermal Stability ◽  
Oil Well Cement ◽  
Cement Strength ◽  
Well Cement

A majority of well integrity problems originate from cracks of oil well cement. To address the crack issues, bespoke sodium silicate microcapsules were used in this study for introducing autonomous crack healing ability to oil well cement under high-temperature service conditions at 80 °C. Two types of sodium silicate microcapsule, which differed in their polyurea shell properties, were first evaluated on their suitability for use under the high temperature of 80 °C in the wellbore. Both types of microcapsules showed good thermal stability and survivability during mixing. The microcapsules with a more rigid shell were chosen over microcapsule with a more rubbery shell for further tests on the self-healing efficiency since the former had much less negative effect on the oil well cement strength. It was found that oil well cement itself showed very little healing capability when cured at 80 °C, but the addition of the microcapsules significantly promoted its self-healing performance. After healing for 7 days at 80 °C, the microcapsule-containing cement pastes achieved crack depth reduction up to ~58%, sorptivity coefficient reduction up to ~76%, and flexural strength regain up to ~27%. The microstructure analysis further confirmed the stability of microcapsules and their self-healing reactions upon cracking in the high temperature oil well cement system. These results provide a promising perspective for the development of self-healing microcapsule-based oil well cements.

Synthesis of core–shell soap-free emulsion and evaluation of its performance in oil-well cement

2020 ◽  
Vol 32 (7) ◽  
pp. 307-314
Author(s):  
Zhi-gang Peng ◽  
Jia-rong Wu ◽  
Qian Feng ◽  
Jian Zhang ◽  
Bo-jian Zhang
Keyword(s):  
Core Shell ◽  
Oil Well ◽  
Oil Well Cement ◽  
Well Cement

Wellbore Integrity and CO2 Sequestration Using Polyaramide Vesicles

2021 ◽  
Author(s):  
Elizabeth Q. Contreras
Keyword(s):  
Oil Well ◽  
Gravimetric Analysis ◽  
Self Healing ◽  
Gas Migration ◽  
Reactive Polymer ◽  
Wellbore Integrity ◽  
Polymer Vesicles ◽  
Oil Well Cement ◽  
Well Cement ◽  
Oilfield Equipment

Abstract A new cementing additive is chemically engineered to react with formation fluids that act antagonistically towards cement. Engineered polymer capsules house encapsulants to react with antagonistic gases downhole like CO2 to form a more benign and beneficial material. Embedded in cement, the polymer capsules with semi-permeable shells allow fluids to permeate and react with encapsulants to produce beneficial byproducts, such as calcite and water from CO2. Reactivity between the encapsulant and antagonist gas CO2 is demonstrated using thermal gravimetric analysis (TGA) and other tests from oilfield equipment. When cement fails, casing-in-casing events, or CCA, causes antagonistic gases like CO2 to migrate to the surface. Embedded in the cement for such moments such as cement failure, additives housed within polyaramide vesicles chemically and physically intersect CO2 from gas migration events. The shape of the polyaramide additive is unique and versatile. Furthermore, because the material is polymeric, it imparts beneficial mechanical properties like elasticity to cement. A vesicle in form, this polymer allows the manufacturing of new cement additives for applications such as increasing the integrity and sustainability of oil well cement. Data also shows production of calcite by the bulk of the material. This technology applies to CO2 fixation and self-healing cement using reactive polymer vesicles.

Synthesis, characterisation and application of self-healing material in oil well cement for healing microcracks

2020 ◽  
Vol 32 (11) ◽  
pp. 519-526
Author(s):  
Zhi-gang Peng ◽  
Chun-yang Yu ◽  
Qian Feng ◽  
Yong Zheng ◽  
Jin-hua Huo ◽  
...  
Keyword(s):  
Oil Well ◽  
Self Healing ◽  
Oil Well Cement ◽  
Well Cement

Performance of Permeable Crystalline Self-Healing Agent Onmicro-Cracks of Oil Well Cement

2021 ◽  
Author(s):  
Zhigang Peng ◽  
Xiaolong Xia ◽  
Qian Feng ◽  
Yong Zheng ◽  
Chunyang Yu ◽  
...  
Keyword(s):  
Oil Well ◽  
Self Healing ◽  
Oil Well Cement ◽  
Healing Agent ◽  
Well Cement
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