CN-121990694-A - High-temperature-resistant bimetal organic framework modified oilfield scale inhibitor and preparation method and application thereof

CN121990694ACN 121990694 ACN121990694 ACN 121990694ACN-121990694-A

Abstract

The invention relates to the technical field of oilfield chemistry and water treatment, in particular to a high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor, a preparation method and application thereof, which are formed by compounding, by mass, 50% -70% of manganese-cerium bimetal organic framework material, 20% -40% of polymer dispersing agent, 5% -15% of environment-friendly scale inhibition active ingredient, wherein the manganese-cerium bimetal organic framework material is Mn-Ce-BTC material which is formed by taking Mn and Ce as metal nodes and taking 1,3, 5-benzene tricarboxylic acid as ligand, the polymer dispersing agent is coated on the surface of the manganese-cerium bimetal organic framework material, and the environment-friendly scale inhibition active ingredient is loaded in pore channels of the manganese-cerium bimetal organic framework material. According to the invention, a specially designed manganese-cerium bimetal organic framework material is used as a high-temperature resistant carrier, and after being coated and modified by a surface polymer, an environment-friendly scale inhibition active ingredient is loaded, so that a three-element synergistic composite slow-release system of a carrier-stabilizing layer-active core is constructed, and the efficient and long-acting scale inhibition in high-temperature high-mineralization oilfield water is realized.

Inventors

TIAN PEILIN
YAN ZIYI
GAO DECHAO
LIANG HAN
ZHANG JIANBIN
Wang Liucun
TIAN MINGE

Assignees

欣格瑞(山东)化学有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (9)

1. A high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor is characterized by being prepared by compounding the following components in percentage by mass: 50% -70% of manganese-cerium bimetallic organic frame material, 20% -40% Of polymer dispersing agent, 5% -15% Of environment-friendly scale inhibition active ingredients; The Mn-Ce-BTC material is formed by taking Mn and Ce as metal nodes and taking 1,3, 5-benzene tricarboxylic acid as a ligand; The polymer dispersing agent is coated on the surface of the manganese-cerium bimetallic organic framework material; the environment-friendly scale inhibition active ingredient is loaded in the pore canal of the manganese-cerium bimetallic organic framework material.
2. The high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor is characterized in that the molar ratio of Mn to Ce in the manganese-cerium bimetal organic framework material is 1:1.5-1:2.5.
3. The Gao Wenmeng cerium-resistant bimetal organic framework modified oilfield scale inhibitor according to claim 2, wherein the molar ratio of Mn to Ce is 1:1.8-1:2.2.
4. The high temperature resistant bimetal organic framework modified oilfield scale inhibitor of claim 1, wherein the polymer dispersant is at least one selected from the group consisting of sodium polymaleimide, sodium polyacrylate and sodium polyepoxysuccinate.
5. The high temperature resistant bimetal organic framework modified oilfield scale inhibitor of claim 1, wherein the environment-friendly scale inhibition active ingredient is at least one selected from polyepoxysuccinic acid, polyaspartic acid or salts thereof.
6. The high-temperature resistant bimetal organic framework modified oilfield scale inhibitor of claim 1, which is suitable for oilfield produced water systems with the temperature of not lower than 100 ℃ and the mineralization degree of not lower than 150000 mg/L.
7. The preparation method of the high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor according to any one of claims 1-6 is characterized by comprising the following steps: s1, dispersing a manganese-cerium bimetallic organic framework material in a polar solvent; S2, adding a polymer dispersing agent into the system in the step S1 under the condition that the pH value is 6-7, and stirring to form a coating layer on the surface of the manganese-cerium bimetallic organic frame material; S3, adding an environment-friendly scale inhibition active ingredient into the system in the step S2 at the temperature of 40-60 ℃, and stirring to load the environment-friendly scale inhibition active ingredient into a pore canal of the manganese-cerium bimetallic organic framework material; s4, separating a solid product, and drying the solid product at 60-80 ℃ under vacuum conditions to obtain the composite slow-release scale inhibitor.
8. The application of the high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor is characterized in that the high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor is added into oilfield produced water to inhibit calcium carbonate scale and calcium sulfate scale.
9. The method according to claim 8, wherein the compound slow-release scale inhibitor is added to oilfield produced water with the temperature of not lower than 100 ℃ and the mineralization degree of not lower than 150000mg/L, and the addition amount is determined according to the concentration of scale forming ions in the water body.

Description

High-temperature-resistant bimetal organic framework modified oilfield scale inhibitor and preparation method and application thereof Technical Field The invention relates to the technical field of oilfield chemistry and water treatment, in particular to a high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor, a preparation method and application thereof. Background In the exploitation process of oil fields, especially deep wells, ultra-deep wells or oil fields developed by injecting seawater, the produced water is generally characterized by high temperature (usually higher than 100 ℃), high mineralization (total dissolved solids (TDS) is usually higher than 150000 mg/L) and high calcium and magnesium ion concentration. Under the severe conditions, inorganic salt scales such as calcium carbonate (CaCO 3), calcium sulfate (CaSO 4) and the like are easy to separate out and deposit on the surfaces of a shaft, an oil pipeline and equipment, so that flow channels are blocked, the equipment efficiency is reduced, and even safety accidents are caused, and the normal production of an oil field is seriously influenced. The scale inhibitors commonly used in oil fields at present mainly comprise organic phosphonates (such as ATMP and HEDP) and polymers (such as polyacrylic acid and hydrolytic polymaleic anhydride). However, these conventional scale inhibitors suffer from significant drawbacks in dealing with the extreme conditions described above: (1) Although the organic phosphonate has good scale inhibition performance, the organic phosphonate has limited chemical stability, is easy to decompose and lose efficacy at high temperature, and the phosphorus-containing characteristic of the organic phosphonate can cause environmental problems such as eutrophication of water body; (2) The conventional polymer scale inhibitor is easy to curl and degrade molecular chains under high-temperature and high-salt environments, so that the dispersion and complexation capacities of the polymer scale inhibitor are drastically reduced, and the scale inhibition period is short; (3) The existing products mainly adopt liquid direct addition, the consumption of effective components in high-temperature fluid is fast, long-acting slow-release protection cannot be realized, frequent dosing is needed, and the operation cost and complexity are increased. Therefore, the development of the oilfield scale inhibitor with excellent high-temperature stability, long-acting slow release performance and environmental friendliness has important significance for guaranteeing the safe production, cost reduction and synergy of the oilfield under extreme working conditions. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor, a preparation method and application thereof, wherein a specially designed manganese cerium (Mn-Ce) bimetal organic framework (MOF) material is used as a high-temperature-resistant carrier, and environment-friendly scale inhibition active ingredients are loaded after the surface polymer is coated and modified, so that a three-element synergistic composite slow-release system of a carrier-stabilizing layer-active core is constructed, and the high-efficiency and long-acting scale inhibition in high-temperature hypersalinity oilfield water is realized. The invention is realized by the following technical scheme: The invention provides a high-temperature-resistant bimetal organic framework modified oilfield scale inhibitor which is a solid compound and comprises the following components in percentage by mass: 50% -70% of manganese-cerium bimetallic organic frame material, 20% -40% Of polymer dispersing agent, 5% -15% Of environment-friendly scale inhibition active ingredients; The Mn-Ce-BTC material is formed by taking Mn (Mn) and Ce (Ce) as metal nodes and 1,3, 5-benzene tricarboxylic acid (BTC) as an organic ligand, wherein a polymer dispersing agent is coated on the surface of the Mn-Ce bimetallic organic frame material, and an environment-friendly scale inhibition active ingredient is loaded in a pore canal of the Mn-Ce bimetallic organic frame material. Preferably, in the manganese-cerium bimetallic organic framework material, the molar ratio of manganese (Mn) to cerium (Ce) is 1:1.5-1:2.5. More preferably, in the manganese-cerium bimetallic organic framework material, the molar ratio of manganese (Mn) to cerium (Ce) is 1:1.8-1:2.2. At this ratio, mn and Ce form an optimal synergy in the MOF backbone, giving the carrier structural stability in a hydrothermal environment beyond that of a single metal MOF (e.g., mn-BTC or Ce-BTC), which is a matrix for achieving long-lasting slow release. Preferably, the polymeric dispersant is selected from at least one of sodium polymaleic anhydride (HPMA), sodium Polyacrylate (PAAS), sodium Polyepoxysuccinate (PESA). The coating layer not only fu