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A polymer viscosity loss inhibitor and its preparation method, use method and application

An inhibitor and polymer technology, applied in drilling compositions, chemical instruments and methods, and earthwork drilling, etc., can solve problems such as affecting crude oil recovery rate and polymer viscosity loss, and solve the problem of polymer viscosity reduction. Effect

Active Publication Date: 2022-04-26
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a polymer viscosity loss inhibitor, which solves the problem that the polymer viscosity loss occurs in the polymer dispensing process of existing oilfield sewage and sewage thinning, which affects the crude oil recovery rate

Method used

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  • A polymer viscosity loss inhibitor and its preparation method, use method and application

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Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Composition and content of the polymer viscosity loss inhibitor of the present embodiment:

[0036] The first medicament: calculated by mass percentage, it is made of 20% chromium tetroxide, 5% sodium nitrate and the rest of water.

[0037] The second medicament: calculated according to mass percentage, composed of 80% [Cu(NH 3 ) 4 ] SO 4 , 1% sodium molybdate heptahydrate and the rest of water. Among them, [Cu(NH 3 ) 4 ] SO 4 Purchased from Huachen Environmental Protection (Guangzhou) Co., Ltd.

[0038] The third medicament: calculated by mass percentage, it is made of 50% potassium dihydrogen phosphate, 1% potassium dihydrogen phosphate and the rest of water.

[0039] The preparation of the polymer viscosity loss inhibitor of the present embodiment:

[0040] The first agent: according to the above ratio, add the weighed chromium tetroxide and sodium nitrate into the water, and mix well;

[0041] The second medicament: according to the above ratio, the weighed...

experiment example

[0045] From November 2018 to April 2019, a field test was carried out at a polymer dispensing station in an oilfield. The daily sewage volume on site was 1000m 3 , the polymer viscosity loss inhibitor of this embodiment was used to dosing according to 50ppm, and the experimental period was 6 months. The effect is as follows:

[0046] Table 1 Changes of wellhead viscosity loss after adding viscosity inhibitor

[0047]

[0048] It can be seen from Table 1 that before dosing, the average wellhead viscosity loss rate reached 21.25%, and after dosing, the average viscosity loss rate was 20.0%, which was 1.25% lower than before dosing, and there was no overall wellhead viscosity reduction during the dosing period. It is proved that the viscosity inhibitor can better solve the problem of bacterial growth and viscosity reduction.

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Abstract

The invention discloses a polymer viscosity loss inhibitor and its preparation method, use method and application, wherein the polymer viscosity loss inhibitor includes: a first medicament, a second medicament and a third medicament, and the first medicament includes Chromium tetroxide; the second agent, including [Cu (NH 3 ) 4 ] SO 4 ; the third medicament, including phosphate; and the application of polymer viscosity loss inhibitor in the polymer dispensing process of oilfield sewage with sewage thinner to control polymer viscosity loss; solve the polymerization of existing oilfield sewage with sewage thinner The viscosity loss of polymer occurs in the material distribution process, which affects the oil recovery rate.

Description

technical field [0001] The invention relates to a polymer viscosity loss inhibitor used for controlling polymer viscosity loss during oil field polymer injection. Background technique [0002] Polymer flooding is to add a small amount of water-soluble polymer to the injected water to improve the mobility ratio and sweep coefficient by increasing the viscosity of the water phase and reducing the permeability of the water phase, thereby increasing the oil recovery rate of crude oil. Macroscopically, it mainly relies on increasing the viscosity of the displacing fluid, reducing the mobility ratio of the displacing fluid and the displaced fluid, thereby enlarging the swept volume. Microscopically, due to its inherent viscoelasticity, the polymer has a stretching effect on the oil film or oil droplets during the flow process, which increases the carrying capacity and improves the microscopic oil washing efficiency. [0003] During the preparation and injection process of the pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/58C09K8/84E21B43/22
CPCC09K8/588C09K8/58C09K8/845E21B43/16
Inventor 韩光鹤赵明礼寇洪彬赵洪瑞邵金祥张洪强潘文卓朱志宝张哲明王丹
Owner PETROCHINA CO LTD