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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.

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

AI Technical Summary

Problems solved by technology

Compared with the gelation of the polymer gel profile control agent in the ground environment, after the polymer gel profile control agent is injected into the reservoir formation, the pore structure hinders the contact between the polymer molecule and the crosslinker molecule, and its formation The glue speed is reduced and the gelation time is prolonged

Method used

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

Examples

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Effect test

Embodiment 1

[0079] For the reservoir formation to be tested with a permeability of 200md, this embodiment evaluates the reservoir adaptability of the polymer gel profile control agent, and the specific process is as follows:

[0080] Step 1. Prepare multiple cemented artificial cores with a size of 4.5cm×4.5cm×30cm to simulate the 200md oil reservoir formation to be tested, and install a pressure sensor at the front end of each cemented artificial core.

[0081] Step2, preparing formation aqueous solution with a concentration of 4500ppm, the salinity of the formation aqueous solution is the same as the salinity of the 200md oil reservoir formation to be tested.

[0082] Step3, prepare a polymer gel profile control agent with a concentration of 1000ppm, wherein the volume ratio of polymer pure liquid and crosslinking agent is 100:1, and the polymer is partially hydrolyzed polyacrylamide with a molecular weight of about 2000×10 4 .

[0083] Use the currently prepared polymer gel profile co...

Embodiment 2

[0101] For the reservoir formation to be tested with a permeability of 1000 md, this embodiment evaluates the reservoir adaptability of the polymer gel profile control agent. The specific process can refer to Step 1-6 in Embodiment 1, and will not be repeated here.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 贾旭熊春明张松唐孝芬吴行才杨立民卢祥国牛丽伟刘进祥曾致翚白胤杰叶银珠吕静
Owner PETROCHINA CO LTD
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