Petroleum Reservoir Evaluation and Development >
2020 , Vol. 10 >Issue 1: 56 - 63
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2020.01.009
Effect of oxidizing working fluid on permeability of organic-rich shale
Received date: 2019-07-09
Online published: 2020-02-04
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.
Lijun YOU , Yang ZHOU , Yili KANG , Liandong DOU , Qiuyang CHENG . Effect of oxidizing working fluid on permeability of organic-rich shale[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(1) : 56 -63 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.01.009
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