Quantitative testing method of residual polymer in polymer flooding reservoir rocks
A polymer and non-polymer technology is applied in the field of quantitative testing of residual polymers in polymer flooding reservoir rocks, which can solve the problem of inability to directly measure the polymer residual amount in polymer flooding reservoirs, and improve oil recovery. rate effect
Active Publication Date: 2013-08-07
DAQING OILFIELD CO LTD +1
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However, none of the above methods can directly measure the amount of polymer residue in rocks at different well depths in polymer flooding reservoirs.
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[0021] The present invention mainly proposes the determination method of polymer residual amount in polymer flooding reservoir rock, and its main basis is that polymer (polyacrylamide) and its molecule (amide group, carboxyl etc.) etc. are contained in polymer flooding reservoir rock , under the condition of high-temperature combustion, the nitrogen in the rock sample (derived from polymers and crude oil, etc.) is converted into nitrogen oxides, and the nitrogen oxides are then reduced to nitrogen. Detector detection; use polymer standard samples to establish a standard curve of polymer quality and nitrogen content, and by deducting the background value of reservoir rock nitrogen (nitrogen in non-polymers in reservoir rocks) and external standards, the residual polymer in rocks can be realized. Quantitative testing of quantities.
[0022] The present invention will be described in detail below from several aspects.
[0023] 1. Quantitative test of residual polymer in polymer ...
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The invention discloses a quantitative testing method of residual polymer in polymer flooding reservoir rocks. The method adopts a high-temperature oxidizing combustion-reduction thermal conductivity method to detect nitrogen content value data in reservoir rock samples, adopts the correlation between polymer mass and nitrogen content value to establish the relationship formula between the polymer mass and the nitrogen content value, and the polymer background concentration calculated by the nitrogen content value is subtracted, so that the polymer residual quantity in the rock samples is obtained. The method takes the quantitative testing of residual polymer in the polymer flooding reservoir rocks of the Daqing Saertu oil field of Songliao Basin as an example to perform method validation. The method initiates a novel quantitative testing method of the residual polymer in the polymer flooding reservoir rocks, and has practical importance on understanding the heterogeneity, the distribution characteristics and the controlling factors of the residual polymer of the reservoir rocks in different injection-production positions and guiding the tertiary recovery of oil fields to improve the oil recovery factor.
Description
technical field [0001] The invention relates to the field of crude oil development, in particular to a method for quantitatively testing residual polymers in polymer flooding reservoir rocks. Background technique [0002] Polymer flooding in oilfields has been widely used. Taking Daqing Oilfield as an example, since it was put into industrial application in 1996, thousands of wells in dozens of blocks have achieved obvious precipitation and oil-increasing effects and significant technical and economic benefits. In order to increase oil recovery by layered and quantitative injection of polymer, the annual oil production of polymer flooding has accounted for 25% of the annual production of Daqing Oilfield, and it has become an important technical means for oilfields to make up for production decline. With the increase of water cut in crude oil production in Daqing Oilfield, high and stable production and the need to create a "century-old oilfield", polymer flooding blocks and ...
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IPC IPC(8): G01N25/22G01N25/20
Inventor 张居和冯子辉方伟迟焕远张博为刘继莹霍秋立李景坤宁晓玲高淑玲孙东
Owner DAQING OILFIELD CO LTD