The Effect Of Rock Mineral Composition In Daqing F Reservoir On The Rock Properties

Understanding of clay mineral and heavy mineral composition is the base to further analysis of pore structure,wettability,sensitivity of the reservoir rock and the change of percolation mechanism.Before an oil and gas field development.besides conventional research such as porosity,permeability,saturation and the pore structure,also must for various core sensitivity experiments,to find out the potentially dangerous and the damage level to the reservoir when reservoir fluid contact with foreign construction.Understanding the wettability of reservoir rock is also one of the most basic knowledge,especially in the water flooding development oilfield,research on rock wettability,to determine whether injection water well wetted the rock surface,Water capacity in the process of water flooding,Analysis the relationship between the rock mineral composition and the sensitivity or wettability.This article through the analysis of rock mineral composition to Daqing F reservoir,By using X ray diffraction,the casting thin sections and methods such as polarizing microscope determine the content of clay minerals(smectite,kaolinite,illite,chlorite,mixed layer clay mineral),silicate(quartz,feldspar,mica,etc.),argillaceous,carbonatite(calcite,carbonate,etc.),and heavy mineral(biotite,chlorite,hematite,magnetite,limonite,pyrite,barite,etc.)in rocks.And by flowing experiments to measure the velocity sensitivity,water sensitivity,acid sensitivity,alkali sensitivity and salt sensitivity of Daqing F oil reservoir rock and evaluate the sensitivity.Using contact Angle tester determine the rock wettability,According to the result of experimental,analysis the relationship between the sensitive degree of rock,the wettability and rock mineral composition.Through the results of experiment,determine the content of rock composition,sensitive characteristics and the wettability of Daqing F reservoir rock.Put forward some suggestions in the development of Daqing F reservoir:in the process of waterflooding,In order to reduce the reservoir damage caused by velocity sensitivity,injection speed should not exceed the critical velocity;'When oil Wells are in the project operation,should choose the appropriate working liquid,and add the right amount of clay stabilizer,to restrain the hydration expansion and dispersion of clay minerals,in order to prevent the reservoir damage caused by water sensitivity and alkali sensitivity;In acidizing treatment,the positive and effective measures should be taken,we can add some appropriate corrosion inhibitor in order to make full use of its benefits and reduce the damage to the formation;in the oil field development,the PH value of injected water must be strictly controlled;For the oil—wet rock,in order to improve the recovery,we can add the appropriate surfactant,changing the rock surface wettability from oil—wet to water—wet.