Method for testing productivity profile of fluorescent nano proppant

Abstract

The invention discloses a method for testing the productivity profile of a fluorescent nano proppant, and belongs to the field of oil exploitation. The method comprises the following steps that a fluorescent nano-material and an artificial polymer are synthesized and coated on the proppant, the property that fluorescent nano-materials with different sizes can be excited to emit fluorescence with different colors is utilized, during fracturing construction, the fluorescent nano proppant with specific optical property information is used as a marker and is injected into target layer sections of oil, gas and water wells, oil, gas and water phase samples produced in the wells are collected on the ground during flowback or production of the wells, flowback concentrations of different fluorescent nano markers are analyzed through a special instrument, and the contribution ratio of oil production, gas production and water production of each fractured interval are calculated, thereby achieving the purpose of testing the productivity profile. The fluorescent nano proppant can resist high temperature, high pressure, acid, alkali and salt and other complex environments, is stable in performance, slowly releases a fluorescent nano marker in a stratum, and can enable the monitoring validity period to be as long as 3-5 years.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, in particular to a method for testing the production capacity profile of a fluorescent nano proppant. Background technique [0002] Productivity profile testing is a very effective technique for in-depth understanding of the liquid and gas production capabilities of each target interval of the oil and gas reservoir. At present, there are mainly methods such as downhole logging instrument monitoring and tracer monitoring. [0003] The monitoring of logging tools is mainly to run pressure gauges, flow meters and other instruments into the target layer to collect data such as pressure and flow, and then analyze the productivity profile. This process technology requires downhole operation, the operation period is long, the cost is high, and there are risks such as instrument jamming and disconnection. [0004] Tracer monitoring includes four generations of technical products such as chemical t...

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Problems solved by technology

Chemical tracers require a large amount, high cost, poor adaptability and selectivity, low test resolution, and environmental and personnel safety issues; radioactive isotope tracers are radioactive, which is unfavorable to personnel and environmental safety, and their applications are limited; stable isotopes The tracer needs to be activated by an indoor atomic reactor, and its analysis and testing methods are complicated and expensive; the tracer of trace substances is affected by the flowback rate, the test cycle is short, and the types of tracers for gases are relatively small

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