Influential factor of interlayer interference in commingled-producing wells in tight gas reservoirs with rich water,Dongsheng gasfield
With rich water,some tight gas reservoirs in Dongsheng gasfield along the northern margin of Ordos Basin were taken as objectives to make clear the interlayer interference in commingled-producing wells and its main influential factors and to guide the efficient development of commingled wells in similar reservoirs.Moreover,controls of reservoirs'geologi-cal conditions and stimulation on the contribution of each payzone in commingled wells were analyzed to determine the in-fluential factors on this interference in such well type.Results show that(ⅰ)the contributing rate is dominated by porosity,permeability and gas saturation in each payzone,among which the porosity is the leading contributor;(ⅱ)reservoir fractur-ing plays a great role in production increase,but it exerts a little effect on the contributing rate;(ⅲ)as for the tight gas reservoirs with rich water,the gas saturation is a key element impacting on this rate and interlayer interference;and(ⅳ)di-versities of magnitude order in porosity,permeability and gas saturation among different payzone may affect directly the in-terference degree.In conclusion,the production contributing rate of each payzone in commingled wells increases with the porosity,permeability and gas saturation.What's more,the interference degree raises with the diversities in these three properties.The interlayer interference is quite severe and should be governed as early as possible if the porosity,permea-bility,and gas saturation diversities are larger than 1.248,2.69,and 1.22,respectively.
Northern margin of Ordos BasinDongsheng gasfieldTight gas reservoir rich in water productionCommin-gled-producing wellInterlayer interferenceInfluential factor
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