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Surfactant for reservoir reconstruction and preparation method thereof

A surfactant, a technology for reservoir reconstruction, which is applied in the preparation of sulfonic acid, chemical instruments and methods, and the composition of drilling holes, etc., can solve the problem of not giving test data of temperature resistance, etc. Temperature resistance, the effect of decontamination of the reservoir

Active Publication Date: 2020-09-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] CN 201210219382.8 discloses a steering agent that mixes butanol, ethyl bromide, and N-alkyl-N-dioctadecane and reacts at 70-75°C for 6-6.5 hours. The prepared steering acid has a temperature resistance of 150°C. However, there is no test data for temperature resistance
[0013] The diverting acid system prepared by existing surfactants can achieve good diverting of heterogeneous reservoirs, but the temperature resistance is within 160°C, and the acid liquid system used in the field is within 150°C, and the reported temperature resistance is 160-180°C Steering agent not involved

Method used

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  • Surfactant for reservoir reconstruction and preparation method thereof
  • Surfactant for reservoir reconstruction and preparation method thereof
  • Surfactant for reservoir reconstruction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 218.5g of dodecanoyl chloride and 2.54g of elemental iodine into a three-necked flask as a catalyst. After standing for 30 minutes, slowly add 84g of elemental bromine dropwise at a constant speed. The dropping time is controlled at 45-50min, and the temperature is raised to 60°C to start the reaction. After 360 min, the temperature was lowered to 50° C. at a rate of 1° C. / min to obtain intermediate 1a.

[0049] After the intermediate 1a was obtained, 37 g of methanol was added, and cooled to 20° C. at a cooling rate of 1.5° C. / min. The liquid obtained after cooling was washed 4-6 times with saturated aqueous sodium bisulfite solution, and then washed 3-5 times with pure water. The liquid obtained after washing was dried at 95°C for 12 hours, and then filtered to obtain intermediate 2a.

[0050] After obtaining intermediate 2a, anhydrous potassium carbonate 0.8g and acetone 3.4g were mixed in 99.99% N 2 Put it into a three-necked flask under protection, and add 10...

Embodiment 2

[0055] Add 120g of valeryl chloride and 2.54g of elemental iodine into a three-necked flask as a catalyst. After standing for 30 minutes, slowly add 84g of elemental bromine dropwise at a constant speed. The dropping time is controlled at 45-50min. Raise the temperature to 60°C and start the reaction for 360min. , the temperature was lowered to 50°C at a rate of 1°C / min to obtain intermediate 1b.

[0056] After the intermediate 1b was obtained, 37 g of methanol was added and cooled to 20° C. at a cooling rate of 1.5° C. / min. The liquid obtained after cooling was washed 4-6 times with saturated aqueous sodium bisulfite solution, and then washed 3-5 times with pure water. The liquid obtained after washing was dried at 95 °C for 12 hours, and then filtered to obtain intermediate 2b.

[0057] After obtaining intermediate 2b, anhydrous potassium carbonate 0.8g and ethanol 4.1g were mixed in 99.99% N 2 Put it into a three-necked flask under protection, and add 36 g of ethylene gly...

Embodiment 3

[0062] Add 373g of tricosyl chloride and 2.54g of elemental iodine into a three-necked flask as a catalyst. After standing for 30 minutes, slowly add 84g of elemental bromine dropwise at a constant speed. The dropping time is controlled at 45-50min, and the temperature is raised to 60°C to start the reaction. After 360 min, the temperature was lowered to 50° C. at a rate of 1° C. / min to obtain intermediate 1c.

[0063] After the intermediate 1c was obtained, 37 g of methanol was added, and cooled to 20° C. at a cooling rate of 1.5° C. / min. The liquid obtained after cooling was washed 4-6 times with saturated aqueous sodium bisulfite solution, and then washed 3-5 times with pure water. The liquid obtained after washing was dried at 95°C for 12 hours, and then filtered to obtain intermediate 2c.

[0064] After obtaining intermediate 2c, anhydrous sodium carbonate 0.6g and chloroform 7.1g were mixed in 99.99% N 2 It was added into a three-necked flask under protection, and 148 ...

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Abstract

The invention provides a surfactant for reservoir reconstruction and a preparation method thereof. The structural formula of the surfactant is shown in the specification; according to the structural formula, m is any integer from 2 to 20, and n is any integer from 2 to 25. The surfactant disclosed by the invention has a special structure and a special group and good temperature-resistant performance; the plugging pressure of a high-temperature diverting acid system prepared by using the surfactant is greater than 6MPa; the viscosity-variable peak viscosity of the system at 160 DEG C is largerthan 30 mPa.s; the viscosity of a gel breaker is smaller than 5 mPa.s; a rock core acidification effect is larger than 1.3 times; the problem of uniform acid distribution of a 160-180 DEG C high-temperature heterogeneous reservoir can be well solved; and the acidification effect of the high-temperature heterogeneous reservoir is greatly improved.

Description

technical field [0001] The invention belongs to the field of acidification and fracturing reservoir reconstruction in the process of oil and gas development. More specifically, it relates to a surfactant for reservoir reconstruction and a preparation method thereof. Background technique [0002] Reservoir stimulation is an effective technology for increasing production of oil and gas wells and increasing injection of injection wells. The heterogeneity of the actual oil and gas reservoir is serious, the conventional acidizing fracturing fluid enters along the high permeability layer, and the low permeability reservoir is difficult to be effectively stimulated, which seriously affects the effect of acidizing operation. In order to achieve the transformation of heterogeneous oil and gas reservoirs, the acid liquid system capable of plugging and diverting is commonly used at home and abroad, that is, diverting acid for acidizing operations. Steering acid is usually added speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C07C309/14C07C303/22
CPCC09K8/74C07C309/14C09K2208/30
Inventor 王道成吴文刚孙川敬显武王川张燕张倩刘爽原励杜国滨荣元帅张兴德
Owner PETROCHINA CO LTD
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