使用纳米碳酸钙降低低孔低渗煤层气储层伤害

谷穗; 蔡记华; 常德武; 维克多·费多罗维奇·契霍特金

doi:10.3799/dqkx.2015.091

Volume 40 Issue 6

Jun. 2015

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Article Navigation > Earth Science > 2015 > 40(6): 1093-1100

Gu Sui, Cai Jihua, Chang Dewu, Чихоткин Виктор Федорович, 2015. Reducing Formation Damage to Low-Porosity and Low-Permeability CBM Reservoirs Using Calcium Carbonate Nanoparticles. Earth Science, 40(6): 1093-1100. doi: 10.3799/dqkx.2015.091

Citation:

Gu Sui, Cai Jihua, Chang Dewu, Чихоткин Виктор Федорович, 2015. Reducing Formation Damage to Low-Porosity and Low-Permeability CBM Reservoirs Using Calcium Carbonate Nanoparticles. Earth Science, 40(6): 1093-1100. doi: 10.3799/dqkx.2015.091

Citation:

Gu Sui, Cai Jihua, Chang Dewu, Чихоткин Виктор Федорович, 2015. Reducing Formation Damage to Low-Porosity and Low-Permeability CBM Reservoirs Using Calcium Carbonate Nanoparticles. Earth Science, 40(6): 1093-1100. doi: 10.3799/dqkx.2015.091

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Reducing Formation Damage to Low-Porosity and Low-Permeability CBM Reservoirs Using Calcium Carbonate Nanoparticles

doi: 10.3799/dqkx.2015.091

1.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
2.
Wuhan University of Engineering Science, Wuhan 430200, China

Received Date: 2014-07-10
Publish Date: 2015-06-15

Abstract

Abstract

It's difficult to block a mass of nanoscale pores in the low-porosity and low-permeability coalbed methane (CBM) reservoirs using traditional temporary plugging additives. The performances of reducing formation damage to low-porosity and low-permeability CBM reservoirs using calcium carbonate nanoparticles (nCaCO₃) are evaluated in this study through microscope investigation of coal rocks, the basic performance tests of drilling fluid, mud cake removal tests, pore size distribution tests and gas permeability tests of coal rocks. It is found that only when nCaCO₃ are dispersed to nano-scaled state in water solution could it temporally plug the low permeability coal rocks. However, nCaCO₃ based degradable drilling fluid not only blocks the microscale pores in low-porosity and low-permeability coal rock, but also blocks the nanoscale pores. With the double unplugging technology of biological enzyme plus low concentration hydrochloric acid on the nCaCO₃ based drilling fluid, the permeability recovery rate of coal rocks ranges from 77.17% to 97.98%. The reservoir protective effect on reservoir proves good. It is shown that the pore size distribution test could be used in the investigation on temporally plugging performance of nanoparticles to low-porosity and low-permeability reservoirs on nanoscale. This study may offer a technical support to facilitate future applications of nCaCO₃ in drilling and completion process of low porosity and low permeability coal seams and shale formation.

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References(34)

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Reducing Formation Damage to Low-Porosity and Low-Permeability CBM Reservoirs Using Calcium Carbonate Nanoparticles

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