Efficient sealing of cemented sheath: An oil-responsive self-healing latex with toughness enhancement for cement composites

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-10-09 DOI:10.1016/j.conbuildmat.2024.138574

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引用次数: 0

Abstract

The integrity of the cemented sheath is important to the safe exploration of oil and gas resources. Sealing failure of cement sheath will result in formation fluid channeling and pressure carryover in the annulus. The both toughening and oil-responsive self-healing latex (TOS) was prepared to achieve efficient sealing of cemented sheath, and prolong its service life. The structure and oil swelling behavior of TOS, its toughening and self-healing effects on hardened cement paste (HCP) were analyzed by comprehensive characterizations. Results demonstrated that TOS possessed excellent stability and an oil swelling rate of 1235 %. Cement specimens by curing 28d containing 8 % TOS exhibited a 27.8 % increase in flexural strength, a 48.7 % reduction in elasticity modulus and a 33.8 % reduction in brittleness coefficient. The addition of TOS can effectively improve the toughness of cement. The average pore size of specimens containing 8 % TOS admixture decreased to 9.17 nm. This indicates that TOS enhanced the structural density of cement materials. The crack about 103μm in the cracking specimens with 8 % TOS was almost healed, and the corresponding permeability was reduced 99.1 % after curing in oil. Adsorption and film formation of TOS can resist the cracking of cement sheath, and the oil swelling expansion of film in cement matrix can repair the cracked structure.

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水泥鞘的高效密封：用于水泥复合材料的具有韧性增强功能的油响应自愈合胶乳

固井护套的完整性对于安全勘探油气资源非常重要。固井护套密封失效将导致地层流体通道和环空压力携带。为了实现对水泥护套的有效密封并延长其使用寿命，我们制备了同时具有增韧和油响应性能的自修复胶乳（TOS）。通过综合表征分析了 TOS 的结构和油膨胀行为，及其对硬化水泥浆（HCP）的增韧和自愈合作用。结果表明，TOS 具有优异的稳定性，油膨胀率高达 1235%。含 8% TOS 的水泥试样经 28d 固化后，抗折强度提高了 27.8%，弹性模量降低了 48.7%，脆性系数降低了 33.8%。添加 TOS 可以有效提高水泥的韧性。含有 8 % TOS 掺合料的试样的平均孔径减小到 9.17 nm。这表明 TOS 提高了水泥材料的结构密度。掺有 8% TOS 的开裂试样中约 103μm 的裂缝在油中固化后基本愈合，相应的渗透率降低了 99.1%。TOS 的吸附和成膜作用可抵御水泥护套的开裂，而膜在水泥基体中的油胀膨胀则可修复开裂的结构。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.