Properties and plugging behaviors of smectite-superfine cement dispersion using as water shutoff in heavy oil reservoir

Liu, Dexin; Shi, Xiaofei; Zhong, Xun; Zhao, Honglin; Chun, Pang‐jo; Zhu, Tongyu; Zhang, Fang; Shao, Minglu; Huang, Gang

doi:10.1016/j.clay.2017.07.030

Cited by 32 publications

(11 citation statements)

References 18 publications

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“…The ultrafine cement particle system serves as a significant plugging agent in the near-well zone of steaminjection heavy oil reservoirs, because it is inexpensive and temperature insensitive having temperature resistance up to 300 °C. 16 However, due to the composition of inorganic rigid particles, it is difficult to distribute throughout the in-depth formation, resulting in a narrow plugging radius and unsatisfactory plugging effect. In addition, the short curing time of ultrafine cement particles usually brings a great risk of rapid curing when used at high steam temperatures, limiting their large-scale application in heavy oil reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Research and Application Progress of Wet-Phase Modified Expandable Graphite as a Steam Plugging Agent in Heavy Oil Reservoirs

Zhao

Cheng-lin

et al. 2022

Energy Fuels

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Wet-phase modified expandable graphite (WMEG) particles have been successfully developed for in-depth steam channeling control in heavy oil reservoirs. WMEG particles can expand 4 to 7 times in a wet-phase environment and form a worm-like structure at steam temperature. The sand-pack flowing experiments demonstrated that WMEG particles have good injection, steam erosion resistance, and selective plugging capacity characteristics. By directly plugging and bridge plugging after expansion, WMEG particles can effectively plug steam channels. This paper also analyzes the EOR potential of WMEG particles through oil displacement experiments, proving that WMEG particles can further enhance oil recovery of heavy oil reservoirs. To better explain the steam plugging mechanism, the energy changes during WMEG particle expansion were also analyzed. The release of gas at different stages is the source of energy for WMEG particle expansion. WMEG particles have been successfully applied to 12 wells of four typical heavy oilfields in China. The results from these applications confirm that the injection of WMEG particles is an effective steam channeling control treatment. The success of these oilfield tests can also serve as a reference for similar steam injection heavy oilfields.

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Section: Introductionmentioning

confidence: 99%

Research and Application Progress of Wet-Phase Modified Expandable Graphite as a Steam Plugging Agent in Heavy Oil Reservoirs

Zhao

Cheng-lin

et al. 2022

Energy Fuels

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“…Ultrafine cement particle is smaller than the ordinary ones and has better flowing performance and higher strength [ 1 , 2 ]; that is why it’s mainly to satisfy the demands of grouting materials and high-early strength of cement-based materials. Portland cement is widely used in tunnel engineering as a grouting material [ 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…Portland cement is widely used in tunnel engineering as a grouting material [3][4][5][6]. With the actual engineering requirements higher and higher, the weakness of Portland cement, such as large particles and poor impermeability, cannot be ignored [1,[7][8][9]. Japan developed ultrafine cement as a grouting material in 1974 [10], aiming to not only fill tiny cracks but also meet environmentally friendly requirements [11].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Influence Factors of Early Hydration of Ultrafine Cement

Sangbong

Wang

et al. 2021

Materials

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This work intends to contribute to the understanding of the influence factors of early hydration of ultrafine cement by focusing on the different fineness, different kinds of hardening accelerators, and different curing temperatures. Isothermal calorimetry, thermogravimetry, and X-ray diffraction (XRD) were performed to compare the hydration and chemical evolution of pastes containing accelerators with different fineness and curing temperatures; meanwhile, mechanical properties and water absorption were tested. The results showed that the cement fineness had a significant effect on the early hydration process; the smaller the cement particle size, the higher the early compressive strength. The 24 h compressive strength of ultrafine cement with a particle diameter of 6.8μm could reach 55.94 MPa, which was 118% higher than the reference cement. Water absorption test results indicated that adding 1% Ca(HCOO)2 to ultrafine cement can effectively reduce the water absorption, and it was only 1.93% at 28 d, which was 46% lower than the reference cement. An increase in curing temperature accelerated the activation of ultrafine cement in terms of the strength development rate, and the content of Ca(OH)2 in the ultrafine cement paste could reach 13.09% after being mixed with water for 24 h, which was 22% higher than that of the reference cement.

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“…As well as OPC, UPC (Ultra-fine Portland Cement) is also an industrialized product, but compared with OPC, UPC has a larger specific surface area, faster hydration rate, higher strength, and better stability [5]. Reinhardt was the first to introduce the functions and applications of ultrafine cement [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties and Structural Characteristics of Modified Sludge in Foundation Pit

Wang¹

2021

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To explore the efficient method of sludge modification, Ultra-fine Portland cement (UPC) was introduced as a sludge modifier regarding Ordinary Portland Cement (OPC) modified sludge as a reference. The mechanical properties and microstructural changes of UPC-modified sludge with different curing time and cement content were carried out by unconfined compressive strength (UCS), X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM) tests. Results show that the UCS of UPC-modified sludge varies with curing time and cement content in the same way as that of OPC-modified sludge. However, compared with OPC-modified sludge, UPC has a higher sludge modification efficiency, and the UPC-modified sludge has greater compressive strength, significantly early-strength, and stronger resistance to deformation. The stress-strain curves of UPC-modified sludge present significant peak stresses, and which show a brittle failure mode. The combination of the hydration products calcium silicate hydrate (C-S-H) gels and ettringite (Aft) crystals are the essential reason for the improvement of the macroscopic strength of the modified sludge. In contrast to OPC, the UPC hydrates faster and more fully. The UPC-modified sludge can generate more hydration products under the same conditions, this is why that has high efficiency and early-strength. The conclusions obtained in this study can provide a reference for the similar engineering application of ultra-fine cement in modified sludge.

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Properties and plugging behaviors of smectite-superfine cement dispersion using as water shutoff in heavy oil reservoir

Cited by 32 publications

References 18 publications

Research and Application Progress of Wet-Phase Modified Expandable Graphite as a Steam Plugging Agent in Heavy Oil Reservoirs

Research and Application Progress of Wet-Phase Modified Expandable Graphite as a Steam Plugging Agent in Heavy Oil Reservoirs

Exploring the Influence Factors of Early Hydration of Ultrafine Cement

Experimental Study on Mechanical Properties and Structural Characteristics of Modified Sludge in Foundation Pit

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