Polymer oil displacement agent and preparation method thereof

An oil displacing agent and polymer technology, which is applied in the field of polymer oil displacing agent and its preparation, can solve problems such as viscosity reduction and the like, and achieve the effects of increased steric hindrance, enhanced salt tolerance, and weakened possibility

Inactive Publication Date: 2015-10-14
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cations in the aqueous solution, especially the divalent ions, will shield the ionic groups in the polymer and make the polymer molecular chain curl, so that the viscosity-increasing property is greatly reduced

Method used

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  • Polymer oil displacement agent and preparation method thereof
  • Polymer oil displacement agent and preparation method thereof
  • Polymer oil displacement agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A polymer oil displacement agent, the oil displacement agent is prepared from three monomers of styrene sulfonic acid, N-methylol acrylamide and N-vinylpyrrolidone, and the proportion of each component is as follows according to weight:

[0027] 40 parts of styrenesulfonic acid

[0028] 35 parts of N-methylolacrylamide

[0029] N-vinylpyrrolidone 25 parts

[0030] A preparation method of polymer oil displacement agent, comprising the following steps:

[0031] a. Take styrene sulfonic acid, N-methylol acrylamide and N-vinylpyrrolidone according to the weight proportion and mix them evenly, add deionized water, and make the monomers with a total mass percentage concentration of 30% aqueous solution;

[0032] b. Cool down the aqueous monomer solution mixed in step a to 0°C, and adjust the pH value to 6-8;

[0033] c. Warm up the aqueous monomer solution in step b to room temperature, and stir with nitrogen gas for 30 minutes;

[0034] d. Add initiator ammonium sulfate...

Embodiment 2

[0037] A polymer oil displacement agent, the oil displacement agent is prepared from three monomers of styrene sulfonic acid, N-methylol acrylamide and N-vinylpyrrolidone, and the proportion of each component is as follows according to weight:

[0038] 30 parts of styrene sulfonic acid

[0039] 40 parts of N-methylolacrylamide

[0040] 30 parts of N-vinylpyrrolidone

[0041] A preparation method of polymer oil displacement agent, comprising the following steps:

[0042] a. Take styrene sulfonic acid, N-methylol acrylamide and N-vinylpyrrolidone according to the weight proportion and mix them evenly, add deionized water, and make the monomers with a total mass percentage concentration of 30% aqueous solution;

[0043] b. Cool down the aqueous monomer solution mixed in step a to 0°C, and adjust the pH value to 6-8;

[0044] c. Warm up the aqueous monomer solution in step b to room temperature, and stir with nitrogen gas for 30 minutes;

[0045] d. Add initiator ammonium sul...

Embodiment 3

[0047] The temperature resistance investigation of embodiment 3 polymer oil displacement agent

[0048] The polymer oil displacing agent that embodiment 1 and embodiment 2 are made into the aqueous solution of 1500mg / L respectively, put into constant temperature water bath, the temperature of constant temperature water bath is between 20-120 ℃, selects the R / S Plus viscometer with a shear rate of 9.25S -1 , Determination of the apparent viscosity of polymer oil displacement agent aqueous solution with the change of temperature, the data are shown in Table 1.

[0049] Table 1 Apparent Viscosity Variation Results with Temperature

[0050]

[0051] The branching degree of the molecular structure of the oil displacement agent is obviously improved, so the steric hindrance increases, and the benzene ring and five-membered heterocyclic ring on the branched molecular chain increase the rigidity of the molecular main chain and weaken the possibility of chain curling properties, ...

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Abstract

The present invention discloses a polymer oil displacement agent and a preparation method thereof. The polymer oil displacement agent is characterized by being prepared from three monomers by weight: 30-40 parts of styrene sulfonic acid, 25-40 parts of N-methylolacrylamide and 20-30 parts of N-vinyl pyrrolidone. The preparation method of the oil displacement agent is simple and feasible; the prepared oil displacement agent has excellent temperature resistance and high salt tolerance; the molecular structure of the oil displacement agent has significantly improved extent of collateralization, thus increasing the steric hindrance; and coupled with the benzene ring and pentabasic heterocyclic ring on the molecular branched chain, the rigidity of molecular backbone is enhanced, so as to weaken the possibility of curl chain, increase tackability and enhance salt tolerance.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemical agents, in particular to a polymer oil displacement agent and a preparation method thereof. Background technique [0002] The oil extraction process can be divided into primary oil recovery, secondary oil recovery and tertiary oil recovery. Both the primary and secondary oil recovery are recovered through physical methods, and the recovery rate can reach 30%-40%, but most of the crude oil remains in the formation after the primary and secondary oil recovery. The major oil fields in our country have entered the post-stage of secondary oil recovery one after another. In order to improve the recovery factor of the existing oil fields, the tertiary oil recovery technology has been widely used. Tertiary oil recovery enhances oil recovery through polymer flooding, poly-surface binary flooding and poly-surface alkali three-component flooding. Especially in my country's chemical flooding enhan...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F220/58
CPCC09K8/588C08F212/14C08F220/58
Inventor 胡玉国梁海臣李靖张冠洲张有强肖劲松赵东旭张建利黄津高磊张金泉张胜周瑞文赵兴君冯永军王涛苏川党光明
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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