Method for determining lowering of fluid seepage resistance based on nanotechnology

Abstract

The invention provides a method for determining lowering of fluid seepage resistance based on a nanotechnology. The method comprises the steps that first, according to different injection fluids and injection times of an actual working area, the injection process is divided into three stages, namely, the initial injection stage, the nano-solution injection stage and the replacement liquid injection stage; second, according to the seepage Darcy law and the injection times, the total cumulative injection amount of the fluids in a reservoir under the condition of the different injection times ineach of the three phases is determined; third, according to the linear relation between the total cumulative injection amount of the fluids and the injection pressure time integral, the slope of injection resistance curves of the three stages is determined; fourth, the resistance coefficient of the fluid in the reservoir in the nano-solution injection stage and the residual resistance coefficientof the fluid in the reservoir in the replacement liquid injection stage are determined correspondingly; and fifth, according to the relative magnitude relation of the two resistance coefficients in the fourth step, the effects of resistance lowering and injection increasing of the nanotechnology are evaluated. The determining method is accurate, reliable and high in practicability.

Description

technical field [0001] The invention relates to the technical field of water injection development of water injection wells, in particular to a determination method for reducing fluid seepage resistance based on nanotechnology. Background technique [0002] At present, problems such as high water injection pressure of water injection wells in offshore oil reservoirs, frequent operations, and failure to meet injection requirements have seriously restricted the development effect of oil reservoirs and the improvement of reserves production. The reduction of particles available for dissolution cannot further improve the plugging removal effect, and the effective period of the measures is greatly shortened. It is urgent to develop a new nano long-term augmented injection technology. [0003] Nano-injection technology is a synthetic nano-scale polysilicon drag-reducing material. There are unsaturated residual bonds and hydroxyl groups in different bonding states on the surface. T...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of lack of characterization methods for the effect of nanotechnology measures, to provide a method that can accurately and reliably evaluate the influence of nanomaterials on the change of fluid seepage resistance in the reservoir during the process of nano-injection technology measures, and to determine the effect of nanotechnology measures. How to determine the effect of injection

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