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Preparation Method of New Low Permeability Reservoir Water Lock Release Agent

A water lock release, low permeability technology, applied in chemical instruments and methods, preparation of amino compounds from amines, compositions for drilling holes, etc. The effect of permeability, excellent water-unlocking ability

Active Publication Date: 2020-02-04
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned chemical agents can solve the problem of water locking in some reservoirs, for ultra-low permeability reservoirs, due to their large molecular weight, the adsorption on the inner surface of pores will lead to a decrease in reservoir permeability

Method used

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  • Preparation Method of New Low Permeability Reservoir Water Lock Release Agent
  • Preparation Method of New Low Permeability Reservoir Water Lock Release Agent
  • Preparation Method of New Low Permeability Reservoir Water Lock Release Agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Add 4.50 g of amantadine and 100 mL of absolute ethanol into a 250 mL three-necked reaction flask, stir to dissolve, then add 0.5 g of powdered potassium hydroxide, stir, raise the temperature to 65°C, and then slowly add 14.65 g of 2,4-di Fluorobenzyl chloride solid powder takes 2 hours. After the addition is complete, keep the reaction at 65°C for 3 hours and cool to room temperature to obtain a light yellow transparent and uniform liquid.

Embodiment 2

[0008] Accurately weigh the samples prepared in Example 1, stir and dissolve in clear water, and prepare medicament solutions with medicament concentrations of 0.3%, 0.5%, 1.0%, 3.0%, 5.0% and 10.0%, respectively. The viscosity of various concentrations of pharmaceutical solutions at 30°C, 50°C and 70°C was measured with a BROOKFILD DV-III+ rheometer; the results are shown in Table 1.

[0009] Table 1 Viscosity (mPa.s) of different concentrations of medicament solutions at different temperatures

[0010]

Embodiment 3

[0012] The cores of oil wells in different low-permeability reservoir blocks of Shengli Oilfield were selected, and the standard cores with a length × radius of 2.5cm × 2.5cm were prepared. Wash oil, dry, number, vacuumize, measure air permeability; simulated formation water with saturated salinity of 30000mg / L (wherein Ca 2+ content is 150mg / L); Accurately take the sample prepared by embodiment 1, and prepare the medicament solution that the medicament concentration is respectively 0.3%, 0.5%, 1.0% and 3.0% with the above-mentioned same simulated formation water; The flow rate was 1mL / min, and the above-mentioned different concentrations of chemical solution and simulated formation water were injected at the same displacement at 25°C, and the permeability of the core to the above-mentioned different fluids was measured. The results are shown in Table 2, Table 3, Table 4 and Table 5.

[0013] Table 2 Permeability (mDc) of No. 1 oil well core to solutions with different chemica...

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Abstract

The invention relates to a preparation method of new low permeability reservoir water lock release agent, which uses 2,4-difluorobenzyl chloride and amantadine as main raw materials. Ethanol is used as solvent and reaction medium, potassium hydroxide is used as catalyst, and 2,4-difluorobenzyl chloride and amantadine are reacted in a ratio of 3: 1 to quaternize the amino group of amantadine to prepare a water-soluble molecule with certain monodisperse properties. The molecular aqueous solution has low viscosity and strong permeability, has excellent water locking unlocking ability for low permeability water locking cores, and has reliable preparation process, thus providing a new preparation method for ultra-low permeability reservoir water locking unlocking agent.

Description

technical field [0001] The invention belongs to the field of oil recovery additives, and in particular relates to a method for preparing a novel low-permeability oil reservoir water lock release agent by using 2,4-difluorobenzyl chloride and gramamantadine as main raw materials. Background technique [0002] Low-permeability and ultra-low-permeability oil reservoirs account for about 17.5% of my country's petroleum geological reserves, and as high as 60.8% of the proven undeveloped geological reserves. With the advancement of exploration technology, the proportion of low-permeability reserves to proven geological reserves will increase. will be higher. In addition, in the process of drilling, well completion, well workover and oil and gas development, due to unreasonable operation measures, the reservoir permeability decreases; in porous media, the rock surface adsorbs a thin layer of The liquid system further reduces the reservoir permeability. Low-permeability reservoirs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/68C07C211/63C09K8/584
CPCC07C209/68C09K8/584C07C2603/74C07C211/63
Inventor 麻金海孔淑玲方龙
Owner QINGDAO UNIV
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