Oil well chemical paraffin remover, preparation method and application thereof and oil well paraffin removal method

A wax remover and oil well technology, which is applied in the fields of oil well wax remover and oil well chemical wax remover, and can solve problems such as potential safety hazards in oil-based wax remover.

Active Publication Date: 2021-09-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oil-based wax removers have potential safety hazards

Method used

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  • Oil well chemical paraffin remover, preparation method and application thereof and oil well paraffin removal method
  • Oil well chemical paraffin remover, preparation method and application thereof and oil well paraffin removal method
  • Oil well chemical paraffin remover, preparation method and application thereof and oil well paraffin removal method

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Effect test

preparation example Construction

[0073] [1] Li Jinshuang. Preparation of Petroleum Carboxylate [D]. Daqing Petroleum Institute, 2007.;

[0074] [2] Fu Xiaotai, Yang Youzhen. Analysis of Petroleum Carboxylate Surfactant Solution System [J]. Chemistry and Adhesion, 1995(1): 22-2.

[0075] [3] Wu Yihui, Huang Hongdu, Wang Youfu, etc. Determination of petroleum carboxylate and sulfonate content in mixed solution [J], Oilfield Chemistry, 2000, 17(3):281-284.

[0076] [4] Zou Xinfang, Kong Yan, Gong Jihai, etc. Detection method of carboxylate surfactant in ASP flooding production fluid [J]. Daqing Petroleum Geology and Development, 2003, 22(2):58-60.

[0077] Determination method of wax prevention rate and viscosity reduction rate: according to the standard of "SY / T 6300-2009 Technical Conditions of Clearing and Wax Resistant Agents for Oil Recovery".

Embodiment 1

[0082] The temperature of the oil well is relatively high, and sodium persulfate is used without adding a catalyst.

[0083] Preparation of wax remover: put 10g of crude oil into the reactor, add 20g of water, start heating and stirring, set the reaction temperature to 80°C, add 5g of sodium persulfate, react for 2 hours, adjust the pH value of the reaction solution to 10, and get Contain carboxylate surfactant solution (the content of carboxylate surfactant is determined by the method of step titration), then add 5g ethylene glycol monobutyl ether to prepare wax remover; and according to SY / T 6300- 2009 method to determine the wax removal rate and viscosity reduction rate of the wax remover on crude oil samples, the test results are shown in Table 2.

Embodiment 2

[0085] Oil well temperature is low, use sodium persulfate, add catalyst.

[0086] Preparation of wax remover: Put 10g of crude oil into the reactor, add 20g of water, turn on heating and stirring, set the reaction temperature to 40°C, add 5g of sodium persulfate, add 1g of ferrous sulfate, and react for 2 hours, adjust the reaction liquid The pH value is 10, obtains containing carboxylate surfactant solution (the method adopting stepwise titration to measure the content of carboxylate surfactant), then adds 5g Virahol, and measures according to SY / T 6300-2009 method See Table 2 for the test results of the paraffin removal rate and viscosity reduction rate of the crude oil sample.

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Abstract

The invention relates to an oil well chemical paraffin remover, a preparation method and application thereof and an oil well paraffin removal method. The oil well chemical paraffin remover is prepared from the following components: 1 to 10 percent of C10-C18 alkyl carboxylate, 8 to 30 percent of C4-C17 mixed hydrocarbon, 5 to 25 percent of alcohol ether mutual solvent and 35 to 84 percent of water in terms of taking the total mass of the paraffin remover as 100 percent. The invention provides an oil well chemical paraffin remover and a preparation method and application thereof. The paraffin remover disclosed by the invention is an emulsion type paraffin remover, is safe to operate, has good solubility and dispersibility with paraffin of an oil well, and has a good paraffin removal and inhibition effect.

Description

technical field [0001] The invention belongs to the technical field of oil recovery in oil fields, and relates to a chemical wax remover for oil wells, a preparation method and application thereof, and a method for removing wax in oil wells. Background technique [0002] Under the conditions of high temperature and high pressure in oil reservoirs, wax usually exists in the crude oil in a dissolved state. However, in the process of crude oil extraction, the temperature and pressure are continuously reduced. When the temperature and pressure drop to a certain value, the wax dissolved in the crude oil will start to precipitate. As the pressure and temperature continue to decrease and the light components continue to overflow, the wax in the crude oil will continue to precipitate, crystallize, grow, gather, and deposit on the surface of the sucker rod and the inner wall of the tubing. [0003] The paraffin deposited in the tubing string and the ground oil pipeline will reduce t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524E21B37/06
CPCC09K8/524E21B37/06
Inventor 秦冰杨春鹏赵锐
Owner CHINA PETROLEUM & CHEM CORP
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