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Preparation method of environment-friendly multi-scale zirconium gel dispersion plugging agent

A technology of zirconium jelly and dispersion, which is applied in the field of preparation of zirconium jelly dispersion plugging agent, which can solve the problems of poor environmental protection, jelly freezing time, difficulty in controlling the depth of jelly strength entering the formation, water swelling injectability and poor selectivity

Active Publication Date: 2013-02-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall jelly and colloidal dispersion jelly are greatly affected by the shearing of equipment and formation pores and the physical and chemical properties of the formation, which will make it difficult to control the freezing time, jelly strength and penetration depth of the jelly, making the treatment process effective. Injection and selectivity of water-swelling body are poor; polymer microspheres have poor formation adaptability and high cost. Using monomer acrylamide as the raw material for preparation has high toxicity and poor environmental protection
[0004] CN102603966A discloses a method for preparing cross-linked polymer microspheres used for oil field regulation and displacement. The cross-linked polymer microspheres are composed of acrylamide monomers, dendritic functional monomers, cross-linking agent monomers, emulsifiers, Composed of dispersion medium, initiator, deionized water and optional initiator solvent, a microsphere system with an initial particle size of 0.1-10 μm is prepared. The preparation process is relatively complicated, and the monomer acrylamide is used as the raw material, which is highly toxic , less environmentally friendly
CN1743405A discloses a hydrophobic water-swelling agent, which is composed of acrylamide, calcium-based bentonite, alkyl acrylate, N,N-methylenebisacrylamide and deionized water, and the initial particle size is prepared at 0.5~8mm, water-swellable particles with high elasticity, which solves the disadvantages of conventional water-swellable injection into formations that are easily broken
However, due to the limitations of the preparation process, the particle size of the prepared jelly dispersion is mainly at the nanometer level, and the preparation efficiency is low (0.025kg / h), which is difficult to meet the needs of on-site industrial production, and the use of chromium acetate as a cross-linking agent causes environmental pollution. certain pollution

Method used

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  • Preparation method of environment-friendly multi-scale zirconium gel dispersion plugging agent
  • Preparation method of environment-friendly multi-scale zirconium gel dispersion plugging agent
  • Preparation method of environment-friendly multi-scale zirconium gel dispersion plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Take 200g of nonionic polyacrylamide aqueous solution, and add 3.2g of zirconium acetate solution while stirring, so that the mass fraction of zirconium acetate in the gelling solution is 1.6%, and the mass fraction of nonionic polyacrylamide is 0.6%. Stir evenly to obtain a jelly-forming liquid, and the freezing time of the jelly at 30° C. is 100 minutes. Adjust the rotation speed of the colloid mill to 3000rpm, and the shear distance is 10μm. Add the frozen whole jelly and water into the colloid mill at the same time according to the mass ratio of 5:1, and shear at a constant speed for 3 minutes until the end, and the desired nanometer High-grade jelly dispersion, which can be injected after diluting to the required concentration during on-site application.

[0056] The rotational speed of the colloid mill was fixed at 3000 rpm, the shear distance was 10 μm, and the shearing time of the colloid mill was adjusted to 6, 9, 12, and 15 minutes respectively, and the corres...

Embodiment 2

[0058] Take 200g of nonionic polyacrylamide aqueous solution, and add 3.2g of zirconium acetate solution while stirring, so that the mass fraction of zirconium acetate in the gelling solution is 1.6%, and the mass fraction of nonionic polyacrylamide is 0.6%. Stir evenly to obtain a jelly-forming liquid, and the freezing time of the jelly at 30° C. is 102 minutes. Adjust the rotation speed of the colloid mill to 2000rpm, and the shear distance is 10μm. Add the frozen whole jelly and water into the colloid mill at the same time according to the mass ratio of 5:1, and shear at a constant speed for 3 minutes until the end, and the required micron High-grade jelly dispersion, which can be injected after diluting to the required concentration during on-site application.

[0059] The fixed colloid mill rotating speed is 2000rpm, and the shear interval is 10 μm, and the colloid mill shearing time is adjusted to be 6, 9, 12, and 15 minutes respectively, and the corresponding micron-siz...

Embodiment 3

[0061] Take 200g of nonionic polyacrylamide aqueous solution, and add 3.2g of zirconium acetate solution while stirring, so that the mass fraction of zirconium acetate in the gelling solution is 1.6%, and the mass fraction of nonionic polyacrylamide is 0.6%. Stir evenly to obtain a jelly-forming liquid, and the freezing time of the jelly at 30° C. is 102 minutes. Adjust the rotation speed of the colloid mill to 1000rpm, and the shear distance is 10μm. Add the frozen whole jelly and water into the colloid mill at the same time according to the mass ratio of 5:1, and cut at a constant speed for 3 minutes until the end to obtain the required millimeter. High-grade jelly dispersion, which can be injected after diluting to the required concentration during on-site application.

[0062] Fix the colloid mill rotation speed to 1000rpm, the shear time to 3 minutes, adjust the colloid mill shear spacing to 30, 50, 70, 90, 110, 130 μm respectively, and obtain the corresponding millimeter...

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Abstract

The invention relates to a preparation method of an environment-friendly multi-scale zirconium gel dispersion plugging agent. The method includes processing a formed gel system through a mechanical shearing method to enable the gel to form a nano-scale, micron-scale or millimeter-scale gel dispersion, wherein the mass fraction of nonionic polyacrylamide in gelling fluid is 0.6-1%, the mass fraction of a zirconium acetate cross-linking agent is 1-2%, and the gelling is performed at a temperature of 30 DEG C; and taking a colloid mill as a shearing device, adjusting the revolving speed and the shearing spacing of the colloid mill, adding the gel and water into the colloid mill according to a mass ratio of (1-6):1, performing circulating shearing until the gel is evenly dispersed to obtain a multi-scale zirconium gel dispersion solution. The plugging agent can enter the deep positions of stratums through the grain size, adjust water injection profiles effectively, and play a deep fluid diversion role, so that follow-up water is driven to low and medium permeable layers, the water swept volume is enlarged, and the oil recovery is further enhanced.

Description

technical field [0001] The invention relates to a method for preparing an environment-friendly multi-scale zirconium jelly dispersion plugging agent, belonging to the technical field of oil field regulation and displacement. technical background [0002] The long-term water injection development of oilfields leads to the intensification of formation heterogeneity, which accelerates the rise of water cut in the middle and later stages of oilfield development. Therefore, how to reduce the water cut of oil wells is the key to increasing and stabilizing oilfield production. Plugging adjustment is an important technical means to control water and stabilize oil in oilfields, and the research and development of plugging agents is very important. Especially with the increasingly stringent environmental protection laws and regulations and the enhancement of environmental protection awareness, the research and development of environmentally friendly plugging agents is a problem that m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
Inventor 戴彩丽赵光由庆赵明伟赵健慧杨帅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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