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

A technology of polymer and profile control agent, which is applied in the field of petroleum drilling and production, and can solve the problems of slow gelation speed, prolongation of gelation time, hindering the contact between polymer molecules and crosslinking agent molecules, etc.
CN103995083AActive Publication Date: 2014-08-20PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2014-08-20

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Abstract

The invention provides a method for evaluating adaptability of a polymer gel profile control agent to an oil reservoir. The method comprises the following steps: step A, preparing cement artificial rock cores; step B, preparing an aqueous stratum solution; step C, preparing the polymer gel profile control agent; step D, carrying out displacement on one cement artificial rock core by respectively using the aqueous stratum solution and the currently prepared polymer gel profile control agent and calculating the residual resistance factor of the cement artificial rock core; step E, carrying out displacement on another cement artificial rock core by respectively using the aqueous stratum solution and a pure polymer liquid and calculating the residual resistance factor of the cement artificial rock core; and step F, determining a minimum gel forming concentration of a to-be-measured oil reservoir stratum according to a ratio of the residual resistance factor calculated in the step D to the residual resistance factor calculated in the step E. With the method, the polymer gel profile control agent with an appropriate concentration can be selected and used for plugging of the oil reservoir stratum, and cost is low and waste of resources is small in the process of construction.
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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 polymer gel 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 and fl...

Claims

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