Study on the Mechanism of Expansive Self-Healing Additives for Oil Well Cement

WANG Chunyu; BU Yuhuan; SHEN Zhonghou

doi:10.3969/j.issn.1001-5620.2018.06.018

Volume 35 Issue 6

Nov. 2018

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Article Navigation > DRILLING FLUID & COMPLETION FLUID > 2018 > 35(6): 98-102,107

WANG Chunyu, BU Yuhuan, SHEN Zhonghou. Study on the Mechanism of Expansive Self-Healing Additives for Oil Well Cement[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 98-102,107. doi: 10.3969/j.issn.1001-5620.2018.06.018

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WANG Chunyu, BU Yuhuan, SHEN Zhonghou. Study on the Mechanism of Expansive Self-Healing Additives for Oil Well Cement[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 98-102,107. doi: 10.3969/j.issn.1001-5620.2018.06.018

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Study on the Mechanism of Expansive Self-Healing Additives for Oil Well Cement

doi: 10.3969/j.issn.1001-5620.2018.06.018

School of Petroleum Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580

Received Date: 2018-08-05
Publish Date: 2018-11-30

Abstract

Abstract

Micro-fractures developed inside set cement in an oil or gas well seriously affect the isolation integrity between borehole wall and casing string, thereby shortening the life of the well. Self-healing of micro-fractures in set cement is an effective way of resolving this problem. Studies on the mechanisms of expandable self-healing agents have seldom been conducted until now and the self-healing mechanisms lack theoretical support. This paper presents fill factor as an indicator to evaluate the self-healing of set cement, builds a mathematical model describing the sealing of micro-fractures in set cement by expandable self-healing agents, and explains main factors affecting the self-healing of set cement. A simple quantitative method for simulating the micro-fractures developed in set cement was designed based on Brazilian disk test. Several self-selective healing agents were evaluated for their self-healing ability using set cement micro-fracture self-sealing evaluation device, verifying the relationship between the self-healing effect and the amount of liquid adsorbed by self-healing agent, concentration of self-healing agent, as well as the width of micro-fracture. It was found that the selfselective healing agent, when mixed with water, had critical self-healing fill factor of 0.473, and the healing agent is, at most, able to seal fractures of 234 μm in width. The self-selective healing agent when mixed with oil, had critical self-healing fill factor of 0.490, and it is, at most, able to seal fractures of 150 μm in width. The studying results lay a theoretical foundation for the use of expandable self-healing agents in sealing micro-fractures developed inside set cement.
- Oil well cement,
- Self-healing,
- Mathematical model,
- Fill factor

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References(8)

References

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Study on the Mechanism of Expansive Self-Healing Additives for Oil Well Cement

doi: 10.3969/j.issn.1001-5620.2018.06.018