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Intramolecular Cr3+ cross-linked polymer gel and its preparation method

A technology of cross-linking polymers and polymers, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve the problem that polymer molecules cannot achieve a wide range of "intermolecular" cross-linking reactions and polymer gel mines Poor test results, polymer gel molecular configuration damage and other problems, to achieve good technical economy, fast gelation speed, large flow resistance effect

Active Publication Date: 2008-08-06
BEIJING DONGRUNKE GASOLINEEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the indoor conditions, the preparation and gelation process of the mine is restricted by factors such as the "complex chemical environment" of the reservoir, "small and poorly continuous pore space environment" and "flow and shear action", resulting in the accumulation of oil in the reservoir. The large-scale "intermolecular" cross-linking reaction cannot be realized by the polymer molecules, and the "intra-molecular" cross-linking reaction has become extremely difficult, which is the root cause of the poor results of the existing polymer gel field tests
[0005] Because it is impossible to form polymer gels with "intermolecular" cross-linked molecular configuration in the porous media of the reservoir, and it is difficult for the polymer gel formed on the ground to enter the porous media of the reservoir, even if an external force is imposed to enter the porous media, the molecular configuration of the polymer gel will It will also be destroyed and lose its original profile control function

Method used

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  • Intramolecular Cr3+ cross-linked polymer gel and its preparation method
  • Intramolecular Cr3+ cross-linked polymer gel and its preparation method
  • Intramolecular Cr3+ cross-linked polymer gel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1. The Bohai NB35-2 oil field is located in the central part of the Bohai Sea. The heterogeneity of the oil reservoir is relatively serious, and the water flooding development effect is relatively poor. Technical measures for profile control are required. Table 1 shows the experimental results of polymer solution and polymer gel viscosity and time. The polymers in the table are polymers produced by Fushun Longfeng Chemical Factory, with a relative molecular mass of 1700×10 4 . Solvent water is NB35-2 oilfield production sewage with a salinity of 7500mg / L. The crosslinking agent is organic chromium. The experimental temperature is 50°C.

[0017] The relationship between polymer solution and gel viscosity and time (mPa.s) Table 1

[0018]

water type

concentration

(mg / L)

poly:chrome

time (d)

1

2

5

10

20

30

sewage

1000

60∶1

3.6

4.0

3....

Embodiment 2

[0021] Example 2, the polymer used in the experiment is a "high-resolution" polymer produced by Daqing Refining and Chemical Company, with a relative molecular mass of 1600×10 4 , the solid content is 90%; the water is LD10-1 oil field well water; the cross-linking agent is organic chromium, and the effective content is 2.7%. Columnar core, geometric size φ25×100mm, gas permeability 1000×10 -3 μm 2 .

[0022] The polymer solution and polymer gel were prepared according to the formula listed in Table 1, placed at 62°C for 24 hours, and then the core flow experiment was carried out.

[0023] The polymer solution or polymer gel was injected into the core at a rate of 0.3 mL / min, and the experimental data of injection pressure and PV number were recorded. By comparing the injection pressure of the polymer gel with the polymer solution of the same concentration, the gelation status of the polymer gel can be evaluated.

[0024] Experimental protocol number and polymer solution a...

Embodiment 3

[0034] Embodiment 3, Bohai Chengbei oilfield sewage, NaHCO 3 Type, the total salinity is 4600mg / L. The polymer is the "Daqing Super High" polymer of Daqing Refining and Chemical Company, with a relative molecular mass of 2500×10 4 , solid content 90%, polymer concentration 1600mg / L. Salinity regulator NaCO 3 , a concentration of 1.2%. The concentration of auxiliary agent (thiourea) is 160mg / L. The crosslinking agent is organic chromium with an effective content of 2.7%. Columnar core, geometric size φ25×100mm, gas permeability K g ≈1000×10 -3 μm 2 .

[0035] The viscosity test data of polymer solution and polymer gel are shown in Table 4, the test results of resistance coefficient and residual resistance coefficient are shown in Table 5 and Table 6, and the relationship curve between injection pressure and PV (pore volume) number during the test is shown in Figure 3 and Figure 4 .

[0036] Polymer solution and polymer gel viscosity test results Table 4

[0037]

[...

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Abstract

The invention relates to intermolecular Cr 3+ cross-linked polymer gel and a production process. The intermolecular Cr 3+ cross-linked polymer gel comprises the following components which are matched according to mass concentration, wherein partial hydrolysis polyacrylamide is used as host crystal whose concentration range is 0.04%-0.12 %, organic chromium is used as cross linking agent in which the mass concentration of Cr 3+ is calculated based on the mass concentration of polymer, wherein polymer: Cr 3+ = 40:1-100:1, and oil-field produced water or source water is used as solvent. The polymer gel has the characteristics of low viscosity, rapid gel forming speed, large flow resistance and controllable flow ability, which can be used to adjust water injection profile of a water injection well in oil fields which are driven by water, and simultaneously expresses excellent technology and economy.

Description

Technical field: [0001] The invention relates to an auxiliary agent for adjusting the liquid absorption profile of an oil field water injection well or for oil displacement, especially a kind of intramolecular Cr 3+ Cross-linked polymer gel and method for its preparation. Background technique: [0002] With the continuous increase of comprehensive water cut in domestic waterflood development oilfields, how to reduce the inefficient and ineffective circulation of injected water in high permeability layers or large pores, and expand the swept volume of medium and low permeability layers has become a major technical problem in the process of oilfield development . At present, the plugging agent (referred to as profile control agent) commonly used in oilfields to adjust the liquid absorption profile of water injection wells mainly includes Al 3+ 、Cr 3+ Polymer gels and solid particles such as clay, oil well production sludge, fly ash and zeolite as cross-linking agents with c...

Claims

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Application Information

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IPC IPC(8): C08L33/26C08K5/56C08J3/24C09K8/588
Inventor 卢祥国
Owner BEIJING DONGRUNKE GASOLINEEUM TECH
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