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Ionic dissolution behaviors of organic shale soaked in oxidizing liquid for reservoirs stimulation

Kang Yi-li,Dou Lian-dong,You Li-jun,Chen Qiang,Cheng Qiu-yang   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China
  • Received:2018-02-01 Revised:2018-05-23 Online:2018-07-10 Published:2018-07-10

Abstract:

Shale reservoirs are rich in reductive contents such as organic matter and pyrite,thus corrosion and fracturing shale by oxidation can have great potential to be a new technology for shale reservoir stimulation.Previous studies focused more on the changes in pore structure and multi-scale seepage capacity of the shale after oxidation,and not much attention was paid to the changes in the properties of aqueous solution in the process of shale oxidation.However,the properties of aqueous solution have important influence on the returnedfracturing fluid,clay hydration,and relieving aqueous phase trapping damage.The organic matter-rich shale powder samples of Longmaxi Formation in Sichuan Basin were selected to conduct the experiment of immersion in oxidizing liquid with different concentrations and distilled water respectively,and the parameters of cationic composition,pH,Ec,and turbidity of aqueous solution were tested,and the oxidation process of shale was described in detail.In oxidation environment,the dissolved amount of Fe3+,Ca2+ and Mg2+ions in the liquid increases sharply,the pH of the liquid is low,the Ec and turbidity increase.This paper draws the conclusion that the oxidation selectively dissolves the reductive contents such as pyrite,organic matters and the carbonate minerals such as (ankerite) dolomite and calcite in the shale,and releases ion,or disperses mineral aggregates into the size-smaller particles.Some of the shale minerals are “broken” at the microcosmic level,and dissolved pores and micro-cracks are formed,which will help improve the permeability of shale matrix.It is advisable to regulate and control the concentration of oxidizing liquid and the treatment time of oxidation,and optimum and design the treatment process.The flow-back fluid in oxidative stimulation can be dealt with the existing treating methods and technics of shale fracturing flow-back fluid.

Key words: Shale gas, Reservoirs stimulation, Oxidizing liquid, Ionic dissolution, Particle dispersion/migration

CLC Number: 

  • TE357

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