Amphoteric cross-linked polymer microsphere-hydrophobic associative polymer profiling/flooding agent and application thereof

A technology of cross-linked polymer and hydrophobic association is applied in the field of amphoteric cross-linked polymer microspheres-hydrophobically associative polymer adjusting agent, and cross-linked polymer microsphere-hydrophobically associating polymer adjusting and dispelling agent. Solve the problems of weak liquid flow redirection ability, affecting the polymer flooding efficiency, etc., to achieve the effect of increasing the sweep coefficient, improving the oil-water mobility ratio, and improving the displacement capacity

Active Publication Date: 2017-03-01
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with the deepening of research and repeated field tests, the contradiction between the currently used polymer flooding and cross-linked polymer flow weak gel system for the purpose of increasing the viscosity of the displacement fluid and the field implementation conditions has gradually been exposed. , such as: For strongly heterogeneous reservoirs, although the rheological properties of the injected displacement fluid can produce a certain macroscopic liquid flow redirection ability, compared with water well profile control, control and flooding, etc. based on high-permeability pore plugging As far as the current technology is concerned, its liquid flow redirection ability is relatively weak, and it is easy to cause premature breakthrough of displacement fluid through the high-permeability layer and the dominant channel formed during the long-term water injection process, which not only affects the displacement efficiency of polymer flooding, but also affects the follow-up Oil-water separation system brings a series of problems

Method used

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  • Amphoteric cross-linked polymer microsphere-hydrophobic associative polymer profiling/flooding agent and application thereof
  • Amphoteric cross-linked polymer microsphere-hydrophobic associative polymer profiling/flooding agent and application thereof
  • Amphoteric cross-linked polymer microsphere-hydrophobic associative polymer profiling/flooding agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1, preparation of amphoteric cross-linked polymer microspheres:

[0056] (1) Prepare the oil phase: Weigh 32.0 grams of base oil isoparaffin (produced by the isomerization dewaxing unit of Daqing Refining and Chemical Company) (viscosity 10.85cP, flash point 178°C), and add it to a 125 In the milliliter three-necked flask, add 6.72 gram sorbitan monooleate (Span-80, HLB value 4.3) and 1.28 gram sorbitan monostearate polyoxyethylene (20) ether (Tween-60, The HLB value is 14.9) two kinds of non-ionic surfactants, mixed uniformly as the oil phase;

[0057] (2) Prepare the water phase: Weigh 24.49 grams of conventional water-soluble monomer acrylamide, 3.16 grams of 2-acrylamide-2-methylpropanesulfonic acid, and 3.62 grams of acryloyloxyethyltrimethylammonium chloride, Water-soluble cross-linking monomer N,N'-diallyl-N,N,N',N'-tetramethylhexammonium chloride 1.00 g, its molecular structure contains two double bonds, anhydrous sodium acetate 1.0 gram, chelating ...

Embodiment 2

[0064] Embodiment 2, preparation of amphoteric cross-linked polymer microspheres-AP-P4 composite deep-seated flood control agent:

[0065] First add the calculated amount of 0.5% cross-linked polymer microspheres (ES 20) powder mother liquor, so that the mass fraction of amphoteric crosslinked polymer microspheres in the system is 300mg / L, shake well; then add the calculated amount of 0.5% viscosity-average relative molecular weight of 12.5 million hydrophobic association type partially hydrolyzed polyacrylamide ( AP-P4) mother liquor, so that the mass fraction of AP-P4 in the system is 1450mg / L, stir and mix evenly, and then place it in a sealed place at 65°C for 48 hours to obtain the amphoteric cross-linked polymer microsphere-AP-P4 composite deep-seated flood control agent. In the composite deep control and flooding agent, the mass percentage of cross-linked polymer microspheres is 0.03%, the mass percentage of AP-P4 is 0.145%, and the balance is water.

Embodiment 3

[0066] Example 3. Single-tube artificial core displacement experiment of amphoteric cross-linked polymer microspheres-AP-P4 composite deep-seated control and displacement agent:

[0067] Using the composite deep control and flooding agent obtained in Example 2, the gas permeability is 2.0 μm 2 The SZ36-1 simulated oil displacement experiment was carried out on the single-tube artificial core, and the amphoteric cross-linked polymer microsphere-AP-P4 composite deep control and displacement agent increased the simulated oil recovery by 21.88% under the experimental conditions.

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Abstract

The invention relates to an amphoteric cross-linked polymer microsphere-hydrophobic associative polymer profiling/flooding agent and an application thereof. The profiling/flooding agent comprises 0.01-0.5% of amphoteric cross-linked polymer microspheres, 0.01-0.5% of water-soluble hydrophobic associative polymer and balance of water. The amphoteric cross-linked polymer microspheres are prepared through a polymerization reaction in an inert environment. In the reaction system of the polymerization reaction, polymerization monomers account for 1.0-40% of the reaction system by mass; cross-linking monomer accounts for 0.001-3% of the reaction system by mass; the polymerization monomers are anionic monomer, cationic monomer and nonionic monomer, wherein a molar ratio of the anionic monomer to the cationic monomer to the nonionic monomer to the cross-linking monomer is 2.5-25: 2.5-25: 50.0-95: 0.1-6. With the composite deep profiling/flooding agent provided by the invention, water injected reservoir recovery rate can be substantially improved. The profiling/flooding agent is more suitable for waterflooding reservoirs with nonuniform porous media.

Description

technical field [0001] The invention relates to a cross-linked polymer microsphere-hydrophobic association polymer regulating and displacing agent, in particular to an amphoteric cross-linking polymer microsphere-hydrophobic associating polymer regulating and displacing agent and its application, belonging to the field of petroleum industry. Background technique [0002] At present, the early development of oil fields has entered the middle and late stages of water flooding oil recovery. How to further increase the volumetric sweep coefficient and swept volume of injected water and economically and effectively exploit existing oil fields is one of the major issues to be solved in the petroleum industry. Among them, the enhanced oil recovery technology Development and application played an important role. [0003] With the deepening of research, the influence of reservoir heterogeneity on the sweep coefficient of water flooding and chemical flooding fluid has attracted increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588
CPCC09K8/588
Inventor 李先杰张健郑晓宇杨俊茹陈海玲李强陈冠中王剑李丽霞
Owner CHINA NAT OFFSHORE OIL CORP
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