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Method for monitoring oilfield high infiltration strip

A technology for high-permeability strips and oil fields, which is used in surveying, earth-moving drilling, wellbore/well components, etc., to achieve the effect of convenient operation and high degree of automation

Inactive Publication Date: 2008-09-10
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This microprobe can measure the oil saturation of cores and porous media alone, but it has not been used in the identification of high-permeability bands, large pores and monitoring water flow in the reservoir for the prediction of remaining oil distribution.

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  • Method for monitoring oilfield high infiltration strip
  • Method for monitoring oilfield high infiltration strip
  • Method for monitoring oilfield high infiltration strip

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Embodiment Construction

[0021] The present invention applies patent ZL01123944.1 and patent ZL01232851.0 micro-probes for measuring saturation to the oil field site to quickly monitor the heterogeneity and high permeability bands of oil reservoirs. Injecting high-salinity brine into water injection wells, due to the heterogeneity and high-permeability bands in the reservoir, the high-salinity brine flows at different speeds in the reservoir, some directions flow fast, and some directions The flow is slow, and the resistivity change of the output fluid of each oil production well is measured by installing microprobes on the pipelines of multiple oil production wells.

[0022] Since the resistivity is inversely proportional to the salinity of the brine: the higher the salinity, the lower the resistivity, and the change of the salinity of the water in the produced liquid can be measured by the change of the resistivity. When the microprobe measures the sharp drop in the resistivity of the produced fluid...

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Abstract

The invention relates to a method for rapidly monitoring a high permeable strip in an oil field; a microprobe is arranged on production pipelines of more than two oil producing wells in a reservoir block which needs monitoring; an electrode of the probe is connected with a voltage measuring apparatus which is connected with a data collecting computer through cables; salt water is injected into a water injection well; measuring data is continuously read in the oil producing wells; and the data variability of specific resistance is calculated to determine stratum pore canals of the oil producing well and the water injection well. The method for rapidly monitoring the high permeable strip in the oil field has high degree of automation and convenient operation, overcomes the disadvantages of manual sampling in the prior interwell tracing and monitoring technology and rapidly and accurately monitors the high permeable strip and non-homogeneity of the reservoir; the measuring and analyzing result has an important effect on predicting the surplus oil distribution in an old oil field, adjusting a developing proposal and implementing the measures to improve the recovery rate.

Description

technical field [0001] The invention relates to oil exploitation technology, and relates to a method for monitoring high-permeability strips in oil fields in water injection oil fields. Background technique [0002] In the late stage of water injection oil field development in oil production, the water content of the oil production well is as high as 90%. Due to the long-term erosion of the injected water, the pore structure and physical parameters of the reservoir change, and a high permeability strip is formed between the water injection well and the oil production well. The water circulates in the high-permeability zone, which makes it difficult for water to flow into the middle and low-permeability layer, which reduces the water sweep coefficient and displacement efficiency, and prevents a large amount of remaining oil in the reservoir from being recovered. worse. Therefore, in the later stage of water flooding oilfield development, identifying high-permeability zones a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/10E21B49/08
Inventor 王家禄刘玉章贾旭
Owner PETROCHINA CO LTD
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