氧化性入井液对富有机质页岩渗透率的影响

doi:10.13809/j.cnki.cn32-1825/te.2020.01.009

Abstract

Abstract:

Organic-rich shale deposits in the anoxic reductive environment, and is rich in pyrite, chlorite, organic matter and other reductive components. In the process of oil and gas development, a large amount of oxidizing working fluids enter the reservoir, which is incompatible with rock and fluids in reservoir, thus breaking the physical and chemical equilibrium between shale reservoir and formation fluids such as oil, gas and water. The organic-rich shale of Silurian Longmaxi Formation in Pengshui area of southeast Sichuan Basin was selected to conduct the experiment on the interaction between oxidizing fluid and organic-rich shale, so that to analyze the effect of oxidizing working fluid on shale reservoir permeability. The results show that the after the contact of organic shale and oxidizing working fluid, the permeability will change with the fluid oxidation-reduction potential（Eh）, which is called oxygen sensitivity. When the fluid oxidation-reduction potential is less than 450 mV, the generated chemical precipitation solid particles and solid particles of shale debris, such as Fe₂O₃, Fe（OH）₃, siderite（FeCO₃）, calcium sulphate dihydrate（CaSO₄·2H₂O）, MgSO₄ and BaSO₄, lead to the reduction of shale permeability. Regulating Eh of working fluid, inhibiting oxygen sensitivity damage, and playing the role of oxidation and permeability enhancement are the development direction of completion fluid of oil and gas reservoirs under reductive environment.

Key words: shale, oxygen sensitivity, formation damage, reductive minerals, particle migration, oxidation-reduction potential

CLC Number:

TE37

YOU Lijun,ZHOU Yang,KANG Yili,DOU Liandong,CHENG Qiuyang. Effect of oxidizing working fluid on permeability of organic-rich shale[J].Reservoir Evaluation and Development, 2020, 10(1): 56-63.

Figures/Tables 14

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References 22

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矿物名称	平均含量/%	矿物名称	平均含量/%
石英	47.7	方解石	3.4
黏土总量	32.5	白云石	3.1
斜长石	7.4	黄铁矿	3.7
钾长石	2.2

编号	长度/ mm	直径/ mm	气测渗透率/ 10^-3 μm²	液测渗透率/ 10^-3 μm²
LMX-1	48.10	25.10	110.01	5.77
LMX-2	38.44	24.72	3.24	0.51

氧化还原电位/mV	氧化还原性
-200~0	还原性
1~200	弱还原性
201~400	弱氧化性
401~650	氧化性
>650	强氧化性

过硫酸铵浓度/ %	氧化还原电位/ mV
0	425
0.05	473
0.10	605
0.50	766
1.00	851
5.00	934
10.00	987

Effect of oxidizing working fluid on permeability of organic-rich shale

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