Method for evaluating adaptability of gel microsphere profile control agent to oil reservoir

A technology of gel microspheres and profile control agents, which can be used in measuring devices, analysis of suspensions and porous materials, scientific instruments, etc., and can solve problems such as low degree of recovery, expanding the swept area of ​​injected water, and uneven production and suction profiles.

Inactive Publication Date: 2014-08-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the development process, the following problems often appear, such as: prominent plane contradictions, plane injection water rushes along the high permeability zone to form water channels; prominent interlayer contradictions, uneven production and suction profiles, and single-layer r

Method used

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  • Method for evaluating adaptability of gel microsphere profile control agent to oil reservoir
  • Method for evaluating adaptability of gel microsphere profile control agent to oil reservoir
  • Method for evaluating adaptability of gel microsphere profile control agent to oil reservoir

Examples

Experimental program
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Embodiment 1

[0073] For the gel microsphere profile control agent to be tested at a concentration of 3000ppm, this embodiment evaluates the reservoir adaptability of the gel microsphere profile control agent, and the specific process is as follows:

[0074] Step1, make six cemented artificial cores with a size of 4.5cm×4.5cm×30cm, and install a pressure sensor at the front end of each cemented artificial core. The simulated permeability of these six cemented artificial cores is 200md, 300md, 400md, and 500md respectively , 600md, and 700md reservoir formations, where the preset maximum estimated permeability is 700md, and the minimum estimated permeability is 200md.

[0075] Step2, prepare formation aqueous solution for each cemented artificial core, the salinity of the formation aqueous solution is the same as the salinity of the simulated oil reservoir stratum by the cemented artificial core.

[0076] Execute Step3 for each cemented artificial core. The following is an example of a cemen...

Embodiment 2

[0099] For the gel microsphere profile control agent to be tested at a concentration of 5000ppm, this embodiment evaluates the reservoir adaptability of the gel microsphere profile control agent. The specific process can refer to Step1-6 in Example 1, which will not be repeated here repeat.

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Abstract

The invention provides a method for evaluating adaptability of a gel microsphere profile control agent to an oil reservoir. The method comprises the following steps: preparing a plurality of cement artificial rock cores; carrying out displacement on each cement artificial rock core by using an aqueous stratum solution and a to-be-measured gel microsphere profile control agent with a known concentration, calculating residual resistance factors and determining minimum expected applicable permeability and maximum expected applicable permeability according to the residual resistance factors; respectively determining minimum applicable permeability and maximum applicable permeability according to the minimum expected applicable permeability and maximum expected applicable permeability; and determining a range with the minimum applicable permeability and maximum applicable permeability as end points as the range of permeability of an oil reservoir stratum, wherein the to-be-measured gel microsphere profile control agent with the known concentration is applicable in the range. The range can be provided by a manufacturer to a user as an applicable standard of the gel microsphere profile control agent, which facilitates selection of an appropriate concentration of the gel microsphere profile control agent by a profile control water plugging worker.

Description

technical field [0001] The invention relates to the technical field of oil drilling, in particular to a method for evaluating the reservoir adaptability of a gel microsphere profile control agent. Background technique [0002] With the continuous development of the oil field, the heterogeneity of the reservoir is becoming more and more serious. A large amount of injected water scours, the clay and cement in the oil layer expand and dissolve, the migration of particles, and the sand production become heavier, which further deteriorates the geological heterogeneity. During the development process, the following problems often appear, such as: prominent plane contradictions, plane injection water rushes along the high permeability zone to form waterways; prominent interlayer contradictions, uneven production and suction profiles, and single-layer rushing phenomenon in the vertical direction. However, the current recovery of oil and natural gas is very low, so profile control an...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 贾旭熊春明吴行才杨立民唐孝芬张松卢祥国牛丽伟叶银珠吕静
Owner PETROCHINA CO LTD
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