Dissertation
Dissertation > Industrial Technology > Oil and gas industry > Oil and gas development and mining > Production Engineering > Enhanced oil recovery and maintain reservoir pressure (secondary and tertiary oil recovery ) > Acidizing fracturing

A Study on Acidizing Plugging Removal System of Chang-6Reservoir

Author LiWen
Tutor LiuXiang
School Xi'an University of Petroleum
Course Applied Chemistry
Keywords Chang-6reservoir Acidification Wu410area BaoZiWan area Core analysis
CLC TE357.2
Type Master's thesis
Year 2011
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In Wu410area and BaoZiWan area,the Chang-6reservoir have problems of low Permeability and low hygroscope capacity. With the techniques of x-ray diffraction analysis,SEM,sensitivity tests,the thesis make a throught research, on Physical properties of Chang-6reservoir in Wu410well region and Chang-6reservoir in BaoZiWan well region.This work,on the basis of Dissolution experiment and Simulation acidification flow experiment,has summarized the Acid formula for Chang-6reservoir.The conclusions go as follow:(1) The content of Quartz, Feldspar, Clay minerals, Chlorite, Kaolinite of Chang-6reservoir in BaoZiWan area are respectively between29%~36%,44%~53%,12%~17%,4%~8%,4%~5%. And the content of Quartz, Feldspa, Clay minerals, Chlorite, Kaolinite of Chang-6reservoir in Wu410area are respectively between19%-28%,44%~53%,12%~17%,4%~8%,4%~5%. The porosity of Chang-6reservoir in BaoZiWan well region is between15%-19%. The average permeability is0.39×10-3μm2.The porosity of Chang-6reservoir in Wu410well region is between16%~20%. The average permeability is0.28×10-3μm2. Both of BaoZiWan oil region and Wu410oil region were low permeability reservoir. The content of clay mineral is higher.(2) The acid system using HCl+HCOOH+additive as ahead acid, HC1+HF+HCOOH+additive as the main acid and HCl+HCOOH+additive as post-acid was used for the acidic experiment on the study of the servoir of Chang-6reservoir reservoir in Wu410area.(3) The acid system using HCOOH+HCOONa+additive as ahead acid,HCl+HBF4+additive as the main acid and HCOOH+HCOONa+additive as post-acid was used for the acidic experiment on the study of the servoir of Chang-6reservoir reservoir in BaoZiWan area. It is turned out that this acid system can improve the core permeability efficiently and can fufill the goal of acidification.

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