Method for determining residual oil content of a formation using thermal neutron decay measurements专利检索-热中子中子化学元素和化合物专利检索查询-专利查询网

Method for determining residual oil content of a formation using thermal neutron decay measurements

阅读：727发布：2021-06-17

专利汇可以提供Method for determining residual oil content of a formation using thermal neutron decay measurements专利检索，专利查询，专利分析的服务。并且A method for determining residual oil in a formation that has been reduced to residual oil by water drive or waterflooding. The method measures the thermal neutron decay first with the formation water and then with water having a materially different capture cross section substituted for the formation water at least within the radius of investigation of the logging tool.，下面是Method for determining residual oil content of a formation using thermal neutron decay measurements专利的具体信息内容。

权利要求

2. The process of claim 1 wherein the second aqueous liquid is a saline solution containing sodium chloride.

3. The process of claim 1 where sufficient aqueous liquid is injected to remove the displaced aqueous liquid from within a radius surrounding the borehole that exceeds the radius of investigation of said measuring device.

4. A process for determining the fractional water saturation of an earth formation by means of measurements of thermal neutron capture rates, said process comprising: flowing an aqueous liquid through a zone of oil-containing earth formation around a borehole until its oil content is reduced to not more than a waterflood residual oil saturation within the radius of investigation of a thermal neutron capture rate measuring unit; emitting a pulse of neutrons into the borehole of a well and said zone of earth formations and measuring the rate at which the thermal neutrons decay; adjusting the salt concentration of an aqueous liquid to a measured difference from the salt concentration of the aqueous liquid that was flowed through said zone of earth formations; injecting enough of the so-adjusted aqueous liquid to displace the first aqueous liquid in the pores of the earth formation throughout the region of investigation of the above measuring step; measuring the rate at which the thermal neutrons decay after the injection of said liquid having an adjusted salt concentration; measuring the difference between the two measured thermal neutron decay rates; measuring the difference in the neutron capture cross sections of the two aqueous liquids having different salt concentrations; and combining said two difference measurements with other properties of said zone of oil-containing earth formation to obtain a determination of the fractional water saturation of the formation surrounding the borehole.

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Method for determining residual oil content of a formation using thermal neutron decay measurements

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