在现场微型CT扫描和对酸 (DAP) 处理的粉笔的压力强度评估
Yevgeniy Samarkin1, Abduljamiu Olalekan Amao2, Murtada Saleh Aljawad3,4
1Department of Petroleum Engineering, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia.
Scientific reports
|October 5, 2023
概括
酸 (DAP) 有效地加强了石灰岩,提高了其在碳化合物生产过程中对故障的抵抗力. 这种化学巩固提高了岩石强度和弹性模量,为井口稳定提供了有前途的解决方案.
科学领域:
- 地质技术工程 地质技术工程
- 石油工程是石油工程中的一个.
- 材料科学 材料科学 材料科学
背景情况:
- 井口机械故障是碳化合物生产中的一个重大挑战,通常是由孔隙压力降低和有效应力改变引起的.
- 了解岩石的机械特性,如弹性模量和压力强度,对于减轻井口不稳定性至关重要.
- 现有的井口加固方法在石灰中可能存在局限性.
研究的目的:
- 评估二酸 (DAP) 作为一种化学剂,用于加强碳化合物储库中的石灰岩.
- 评估DAP处理在模拟水库条件下对奥斯粉的机械和物理性能的影响.
- 确定DAP作为改善钻井和生产过程中井口稳定的解决方案的潜力.
主要方法:
- 用酸 (DAP) 溶液处理奥斯的石灰岩样本.
- 处理样品暴露于模仿的储条件下,包括两个温度变化 (环境和50°C).
- 通过严格的测试来评估机械和物理性能,包括压力强度和弹性模量.
主要成果:
- 酸 (DAP) 证明了作为碳酸盐岩石巩固剂的高有效性.
- DAP处理显著提高了的机械强度,压力强度增加了22-24%.
- 与未经处理的样本相比,经过处理的粉笔样本的弹性模量增加了多达115%.
结论:
- 酸 (DAP) 是一种有前途的化学物质,用于巩固石灰水库并增强井口稳定性.
- 该研究提供了关于有效策略的宝贵见解,以减轻碳化合物生产中的井口机械故障.
- 在具有挑战性的地质构成中,DAP应用在确保井 integrity方面提供了潜在的进步.
相关概念视频
01:20Microcracking in Concrete
130
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
130
01:12Non-destructive Tests for Concrete Strength
128
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
128
01:20Strength of Cement
161
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
161
01:17Soundness of Cement
192
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
192
01:24Carbonation Shrinkage
152
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
152
01:14Testing Water Quality
121
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
121