Experimental study comparing the microscopic properties of a new borehole sealing material with ordinary cement grout

Zhang, Chao; Chang, Jie; Li, Shugang; Liu, Chao; Qin, Lei; Bao, Ruoyu; Liu, Hua; Cheng, Renhui

doi:10.1007/s12665-019-8165-8

Cited by 16 publications

(12 citation statements)

References 37 publications

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“…Generally, porosity is less than 5.1% and permeability is less than 0.1 × 10 −3 μm 2 . It is the pore structure type of study area difference [17].…”

Section: Class IV Reservoirmentioning

confidence: 99%

Reservoir Physical Properties and Micropore Nanocharacteristics of Cores in the Shihezi Formation, Sudong District, Sulige Gas Field, Ordos Basin

Zhang

Wang

Liang

et al. 2022

International Journal of Analytical Chemistry

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Sulige gas field is a very complex large-scale gas field with low porosity, low permeability, low abundance, and strong heterogeneity. In this study, the nanopore structure of the reservoir in the study area was analyzed. The analysis of reservoir physical properties and core microscopic pore characteristics of Shihezi formation in Sudong District, Sulige gas field, Ordos Basin, was put forward. According to core observation, thin section identification, and grain size analysis, the lithology of gas reservoirs in Shan-1 member and He-8 member in the study area is mainly lithic sandstone, lithic quartz sandstone, and quartz sandstone. According to the analysis of physical data in the study area, the reservoirs in Shan-1 member and He-8 member have typical characteristics of low porosity and low permeability. According to that microscopic observation of sandstone thin section and cast thin section combined with the analysis of scan electron microscope, the results show that both Shan-1 member and He-8 member of Sudong area 2 in Sulige gas field are dominated by class I reservoirs and class II reservoirs. Especially, class I reservoirs are widely distributed, with the cumulative area of this type of reservoirs accounting for 70.12% of the total area in Shan section and 64.12% in He-8 section. Class I reservoirs are scattered in the study area, accounting for 0.27% of the total area in the mountain section and 0.36% in the He-8 section. Class IV reservoirs are distributed dispersedly and have a small distribution area. The cumulative area of reservoirs in mountain section accounts for 5.38% of the total area and that in He-8 section accounts for 5.46%. Therefore, Sudong area 2 in Sulige gas field is a typical low porosity and low permeability reservoir. On the basis of geological background, sedimentary microfacies, diagenesis, and pore structure characteristics of the study area, it is considered that the pore structure of sandstone in the study area is mainly controlled by sedimentary characteristics and diagenesis of sandstone.

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“…Generally, porosity is less than 5.1% and permeability is less than 0.1 × 10 −3 μm 2 . It is the pore structure type of study area difference [17].…”

Section: Class IV Reservoirmentioning

confidence: 99%

Reservoir Physical Properties and Micropore Nanocharacteristics of Cores in the Shihezi Formation, Sudong District, Sulige Gas Field, Ordos Basin

Zhang

Wang

Liang

et al. 2022

International Journal of Analytical Chemistry

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“…In addition, the cement mortar is prone to dehydration, shrinkage, and cracking in the solidification process, which makes it difficult to guarantee the hole sealing effect. As a result, the success rate of hole sealing is low. − The clay material is difficult to fill into the drilling hole, causing a limitation of the sealing hole length and thus reducing the pumping efficiency . The expansion cement overcomes the shortage of cement material solidification time, solidification shrinkage, and improves the effect of hole sealing, but its own strength is low, which makes it difficult to meet the high-pressure sealing.…”

Section: Introductionmentioning

confidence: 99%

Development and Application of Water Sealing Technology for Gas Drainage Boreholes

Hai-jin

Gao

et al. 2021

ACS Omega

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The poor sealing effect of gas extraction boreholes causes low efficiency of gas extraction. As a consequence, the requirements of coal mine safety production are often not attained. The sealing effect of boreholes depends not only on the sealing material itself but also on the combination degree between the material and the hole wall and the structural change characteristics of the material during operation. Our theoretical analysis shows that the amount of liquid leakage increases with the gap width Δ h in a cubic law, decreases with the sealing hole viscosity in a hyperbolic form, increases linearly with the diameter of the borehole, and increases with the eccentricity in a quadratic function. We have developed a PD sealing material that has good compactness and sealing effects, excellent water retention performance, and an expansion rate of 1.29. The material can generate secondary expansion through microscopic development, which is beneficial to improve the quality of the sealing hole. HV-CMC has good stability in plugging mucus. In addition, the manual pump has been redeveloped to be portable and also to overcome the blockage of the suction valve of the original device. In addition, the auxiliary device for drilling and sealing has been invented. The field application demonstrates that the gas concentration and flow pressure difference of the new sealing borehole can be maintained at a high level in a short period of time and then decrease slowly with time. The resulting improved sealing effect demonstrates that our new approach has important theoretical and practical significance for mine gas drainage.

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“…Gas is the main threat to safe, efficient mining 1 , 2 . Determining the width of a gas emission zone after coal excavation allows mine engineers to estimate the intensity of gas emission more accurately; on the other hand, a reasonable sealing depth and length can be determined according to the width of gas emission zone to improve the gas drainage effect 3 – 5 . Therefore, clearly defining the width of gas emission zone can trace the source of mine gas emission effectively and prevent the occurrence of gas disaster accidents (albeit indirectly).…”

Section: Introductionmentioning

confidence: 99%

A calculation method of gas emission zone in a coal mine considering main controlling factors

Chen

Liu

Xuan

2021

Sci Rep

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The gas emission zone is an important parameter for the space–time effect of coal excavation and gas emission. In this paper, according to the effect of roadway excavation, a numerical model of gas emission zone based on the evolution of stress and permeability was established to obtain the width of gas emission zone with different pressure and permeability coefficient. Then the numerical simulation results were verified by measuring the gas content at different depths. Through numerical simulation and field measured data, the theoretical calculation formula is established on the basis of comprehensive consideration of the influencing factors of gas emission zone. The results showed that the gas emission zone increases with the increase of coal seam gas pressure and permeability coefficient when the roadway section and exposure time are the same. The measured gas emission zone, when taking gas content as the index with the same logistic function growth curve, matches the measured results with a relative error of 1.3 to 6%. The validity of the model is also verified by field experiments. The results can provide guidance for mine gas emission and gas drainage design.

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Experimental study comparing the microscopic properties of a new borehole sealing material with ordinary cement grout

Cited by 16 publications

References 37 publications

Reservoir Physical Properties and Micropore Nanocharacteristics of Cores in the Shihezi Formation, Sudong District, Sulige Gas Field, Ordos Basin

Reservoir Physical Properties and Micropore Nanocharacteristics of Cores in the Shihezi Formation, Sudong District, Sulige Gas Field, Ordos Basin

Development and Application of Water Sealing Technology for Gas Drainage Boreholes

A calculation method of gas emission zone in a coal mine considering main controlling factors

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