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Polymer type salt thickener and preparation method thereof

A thickener and polymer technology, which is applied in the field of polymer salt thickener and its preparation, can solve the problems of ordinary polymers such as weak salt resistance, salt resistance needs to be improved, and unsatisfactory oil displacement effect. It is beneficial to reduce cost and increase efficiency, avoid environmental problems, and the effect of simple method

Active Publication Date: 2022-02-08
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, anionic partially hydrolyzed polyacrylamide is commonly used in this field. It is easily affected by divalent ions such as calcium, magnesium, iron, and sulfur in porous media, resulting in weak salt resistance of ordinary polymers and a significant decrease in working viscosity. Oil displacement effect is not ideal
The research on new oil displacement agents mainly focuses on amphiphilic polymers, and some progress has been made, but the salt resistance still needs to be improved. less effective

Method used

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  • Polymer type salt thickener and preparation method thereof
  • Polymer type salt thickener and preparation method thereof
  • Polymer type salt thickener and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A polymer salt thickener, prepared from the following raw materials:

[0029] Monomer: AM for acrylamide, DMAAC-18 for octadecyl dimethyl allyl ammonium chloride, APEG-400 for allyl polyethylene glycol, NVP for N-vinylpyrrolidone;

[0030] and initiators.

[0031] Among them, the preferred initiator is azobisisobutylamidine hydrochloride; the four monomers are calculated in parts by weight: AM monomer is 13.82g, DMAAC-18 monomer is 1.28g, and APEG-400 monomer is 0.80g , NVP monomer is 0.13g; azobisisobutylamidine hydrochloride is 0.0467g.

[0032] A kind of preparation method of polymer type salt thickener, comprises the following steps:

[0033] Step 1: Add 0.80g of APEG-400 to a 100mL silk bottle, then add 62.32g of deionized water, dissolve under stirring, then add 1.28g of DMAAC-18, after the dissolution is complete, then add 0.13g of NVP, and stir completely After dissolving, add 13.82gAM to obtain a solution with a monomer mass percentage concentration of 20%; ...

Embodiment 2

[0037] A polymer salt thickener, prepared from the following raw materials:

[0038] Monomer: AM for acrylamide, DMAAC-18 for octadecyl dimethyl allyl ammonium chloride, APEG-400 for allyl polyethylene glycol, NVP for N-vinylpyrrolidone;

[0039] and initiators.

[0040] Among them, the preferred initiator is azobisisobutylamidine hydrochloride.

[0041] In this scheme, the four monomers are calculated by weight: AM monomer is 13.70g, DMAAC-18 monomer is 1.00g, APEG-400 monomer is 1.00g, NVP monomer is 0.15g; Amidine hydrochloride is 0.0555g.

[0042] A kind of preparation method of polymer type salt thickener:

[0043] Step 1: First add 1.00g of allyl polyoxyethylene ether (APEG-400) into a 1000mL silk bottle, then add 52.03g of deionized water, dissolve under stirring, and then add 1.00g of octadecyl di After methallyl ammonium chloride (DMAAC-18) is completely dissolved, add 0.15g of N-vinylpyrrolidone (NVP), stir and dissolve completely, then add 13.70g of acrylamide (...

Embodiment 3

[0047] A polymer type salt thickener, prepared from the following ingredients in parts by weight:

[0048] 13.82g acrylamide code AM, 1.08g octadecyl dimethyl allyl ammonium chloride code DMAAC-18, 0.80g allyl polyethylene glycol code APEG-400, 0.13g N-vinylpyrrolidone code NVP , 0.0387g initiator.

[0049] Wherein, the initiator is azobisisobutylamidine hydrochloride.

[0050] A kind of preparation method of polymer type salt thickener comprises the following steps:

[0051]Step 1: First add 0.80g of allyl polyoxyethylene ether (APEG-400) into a 100mL silk bottle, then add 62.32g of deionized water, dissolve under stirring, and then add 1.08g of octadecyl di After methallyl ammonium chloride (DMAAC-18) is completely dissolved, add 0.13g of N-vinylpyrrolidone (NVP), stir and dissolve completely, then add 13.82g of acrylamide (AM) to obtain a uniform solution;

[0052] Step 2: Add 0.0387 g of initiator azobisisobutylamidine hydrochloride to the obtained homogeneous solution....

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Abstract

The invention relates to the technical field of oilfield exploitation, and discloses a polymer type salt thickener and a preparation method thereof. The polymer type salt thickener is prepared from the following raw materials: monomers: acrylamide (AM), octadecyl dimethyl allyl ammonium chloride (DMAAC-18), allyl polyethylene glycol (APEG-400) and N-vinyl pyrrolidone (NVP); and an initiator. The preparation method has the beneficial effects that the prepared product is low in initial viscosity and can be easily pumped into the stratum, the viscosity of the polymer is always increased along with the increase of the salt concentration (sodium chloride and calcium chloride), and the product can be suitable for tertiary oil recovery of the extra-high-salt stratum; and meanwhile, the method can be suitable for preparation of a hypersalinity stratum return water oil-displacing agent, and the environmental problem caused by external drainage of stratum return water is avoided.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a polymer salt thickener and a preparation method thereof. Background technique [0002] With the continuous development of oil field exploitation, tertiary oil recovery technology has developed rapidly. At present, polymer flooding is the main development direction of tertiary oil recovery technology, and has become an important measure to enhance oil recovery and ensure stable production in oil fields. Polymer flooding is a stimulation measure in which polymers are injected into formations to drive oil. The viscosity of the displacement fluid is the key to enlarging the swept volume and improving oil recovery. The metal salts have an important influence on the viscosity of oil displacement polymers, including monovalent salts and divalent salts. [0003] At present, anionic partially hydrolyzed polyacrylamide is commonly used in this field. It is easily affecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/02C08F216/14C08F226/10C09K8/588
CPCC08F220/56C09K8/588C08F226/02C08F216/1433C08F226/10
Inventor 田海洋覃孝平刘杰李磊尚建平
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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