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A kind of viscosity stabilizer and its application

A viscosity stabilizer and cross-linking agent technology, applied in the field of viscosity stabilizers, can solve the problems of affecting the oil displacement effect, unsatisfactory effect, viscosity loss, etc.

Active Publication Date: 2018-07-20
华鼎鸿基采油技术服务(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in practice, the shear degradation, thermal degradation and oxidative degradation have seriously reduced the viscosity of the polymer. In addition, my country's fresh water resources are very scarce. At present, sedimentation, air flotation, filtration, flocculation, scale inhibition and other means are used to treat oilfield sewage. It is very unsatisfactory and the treatment cost is high. Therefore, in recent years, the use of oil production sewage to inject polymer has attracted much attention. It has great significance for saving fresh water resources, reducing sewage effluent, and increasing the effect of polymer flooding.
[0005] However, the higher salt content and certain chemical components such as a large number of metal ions, dissolved oxygen, bacteria and impurities in the oil production wastewater have a greater impact on the viscosity of the polymer solution.
The field test also proves that the viscosity loss of oil flooding polymer injected with oil production sewage is greater than that of water source well injection
[0006] Therefore, in view of the main factors affecting polymer degradation and the initial viscosity and stability of sewage polymer solution, from the perspective of eliminating or reducing the impact on polymer solution, solve the viscosity loss of polymer solution in polymer flooding environment that affects oil displacement. effect, it is of great significance to develop a new viscosity stabilizer

Method used

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  • A kind of viscosity stabilizer and its application
  • A kind of viscosity stabilizer and its application
  • A kind of viscosity stabilizer and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054]The viscosity stabilizer is: 10wt% of mercaptobenzothiazole sodium, 2wt% of epoxypropylmethyl diethoxysilane, 5wt% of metal ion complexing agent ethylenediamine tetramethylene phosphonate sodium and the rest of water.

[0055] The experimental polymer selects polyacrylamide (HPAM, 3640C of France Eisen Company), and the salinity of the simulated water used for preparation is 7000mg / L (wherein Ca 2+ with Mg 2+ The sum of the concentrations is 50mg / L), and the polymer concentration obtained by using the above-mentioned raw materials to prepare is 2000mg / L.

[0056] Add the viscosity stabilizer into the polymer solution in the amount of 100-300 mg / L as shown in Table 1, and test its viscosity after constant temperature at 85°C for 180 days. The results are shown in Table 1.

[0057] Table 1 embodiment 1 viscosity test result

[0058]

[0059] It can be seen from Table 1 that, compared with the blank polymer solution without adding a viscosity stabilizer, the addition o...

Embodiment 2

[0061] The viscosity stabilizer is: 10wt% of mercaptobenzothiazole sodium, 5wt% of glycidyltrimethoxysilane, 4wt% of metal ion complexing agent sorbitol and the rest of water.

[0062] The experimental polymer polyacrylamide (HPAM, 3640C from France Eisen Company), the preparation water is respectively platform water source well water, JZ9-3W platform production sewage treatment final stage water and JZ9-3CEPD platform production sewage treatment final stage water; The above-mentioned raw materials are respectively configured into 1200mg / L and 1500mg / L polymer solutions.

[0063] Add the viscosity stabilizer into the polymer solution in the amount of 100-300 mg / L as shown in Table 2, and test its viscosity after constant temperature at 57°C for 180 days. The results are shown in Table 2.

[0064] Table 2 embodiment 2 viscosity test result

[0065]

[0066] It can be seen from Table 2 that the polymer solution with a concentration of 1200mg / L prepared by the platform water ...

Embodiment 3

[0068] The viscosity stabilizer is: 12wt% of mercaptobenzothiazole sodium, 2.5wt% of epoxypropylmethyldiethoxysilane, 4wt% of heptasodium diethylenetriamine pentamethylene phosphonate, and the balance of water.

[0069] Add 5mg / L of Fe in the source well water of the platform 2+ , use it to prepare polyacrylamide polymer (HPAM, France Eisen 3640C) solution concentration is 1200mg / L and 1500mg / L respectively.

[0070] Add the viscosity stabilizer to the 1200mg / L polymer solution according to the dosage in Table 3, and use the 1500mg / L polymer solution as a blank control, place it in an oven at 60°C, and test its viscosity. The results are shown in Table 3.

[0071] Table 3 embodiment 3 viscosity test result

[0072]

[0073] It can be seen from Table 3 that the viscosity retention rate of the polymer solution with a concentration of 1200mg / L has been greatly improved after adding the viscosity stabilizer. After the addition of the viscosity stabilizer is greater than 100mg...

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Abstract

The invention provides a viscosity stabilizer and application thereof. The viscosity stabilizer comprises the following components in percentage by weight: 8-15% of an -SH containing antioxidant, 0.3-5% of an epoxy silane crosslinker, 1-5% of a metal ion complexing agent and the balance of water. Compared with the prior art, through the -SH containing antioxidant, an oxygen free radical can be directly reduced to inhibit or slow down the formation of free radicals at an initiation stage, the epoxy silane crosslinker can react with amino, carboxyl and hydroxy in a water-based system, and the metal ion complexing agent can realize effective complexing of high-valence metal ions in a complexing solution to eliminate polymer coiling caused by the metal ions, so that through the interaction of the three components, the loss of viscosity of a polymer solution prepared from oil field waste water can be reduced, the stability of the polymer solution is improved, and a purpose of improving the oil displacement efficiency is realized.

Description

technical field [0001] The invention belongs to the technical field of stabilizers, in particular to a viscosity stabilizer and its application. Background technique [0002] Polymer flooding is a flooding method that injects a water-soluble polymer solution into the oil reservoir. By increasing the viscosity of the injected water and improving the mobility ratio, the affected area of ​​the displacement phase can be effectively increased, and the oil saturation can be reduced to increase oil recovery. yield. At present, this technology has made great progress in my country, and polymer flooding EOR technology is also widely used in oil fields. [0003] Since polymer flooding improves oil displacement efficiency mainly through polymer adsorption and viscosity, the viscosity of polymer solution is a very important indicator. The research on the viscosity of polymer solutions mainly focuses on the research on crosslinking agents, bactericides, oxygen scavengers, etc., and is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/588
CPCC09K8/58C09K8/588C09K8/882
Inventor 杨雪卢琼王江红
Owner 华鼎鸿基采油技术服务(北京)有限公司
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