A kind of emulsion type acid thickener and preparation method thereof

An acid thickener, emulsion-type technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to form, inability to achieve deep acidification, and inability of thickening acid to maintain good apparent viscosity. , to achieve the effect of stable apparent viscosity, improved acidification effect and good high temperature resistance

Active Publication Date: 2021-08-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The inventor finds that there are at least the following problems in the prior art: the existing acrylamide polymer thickener is suitable for use in high-temperature deep wells within 150 °C, however, as the focus of oil and gas field exploration and development gradually turns to ultra-high temperature reservoirs ( For example, the well temperature of exploration wells in the western and eastern Sichuan regions of CNPC Southwest Oil and Gas Field Company is between 160 and 180°C; The company’s well temperatures in the western Sichuan area are all higher than 160°C), conventional thickened acid cannot maintain a good apparent viscosity at this reservoir temperature, therefore, it cannot form an effective acid action distance for such high-temperature reservoirs, Unable to achieve the purpose of deep acidification

Method used

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preparation example Construction

[0039] In the second aspect, the embodiment of the present invention also provides a preparation method of an emulsion-type acid thickener, the preparation method comprising the following steps:

[0040] Step a, dissolving acrylamide, N-vinylpyrrolidone, cationic monomer, and iron ion complexing agent in water to obtain a water phase reactant;

[0041] Step b, dissolving the emulsifier and the oil-soluble initiator in the white oil to obtain the oil phase reactant;

[0042] Step c, circulating the oil phase reactant, adding the water phase reactant under the condition of nitrogen flow, and adding a redox initiator, and emulsifying to obtain an emulsified product;

[0043] Step d, heating the emulsified product to react, after the reaction, cooling to obtain an emulsion type acid thickener;

[0044] Among them, the weight percentages of each component are: cationic monomer 20%-35%, acrylamide 0.5%-3.5%, N-vinylpyrrolidone 0.5%-3.5%, white oil 24%-32%, emulsifier 1 %-5%, oil-sol...

Embodiment 1

[0063] This embodiment provides an emulsion-type acid thickener, which is prepared by the following method:

[0064] (1) Preparation of water phase reactants: Dissolve 9g of acrylamide, 3g of N-vinylpyrrolidone, and 90g of trimethylaminopropylmethacrylamide chloride in 81.76g of soft water, and add 0.12g of ethylenediaminetetra Acetic acid, dissolved evenly. and 0.012g Na 2 SO 3 Dissolve 0.012g K in 10g soft water 2 S 2 o 8 Dissolve in 10g of soft water.

[0065] (2) Preparation of oil phase reactant: take by weighing 87g white oil and 9gSP80 emulsifier, add 0.12g dibenzoyl peroxide before emulsification.

[0066] (3) Emulsification: Circulate the oil phase reactant, drip the water phase reactant under the nitrogen condition, the dripping adopts the mode of first fast and then slow, in the process of dropping, K 2 S 2 o 8 It is added to the water phase reactant tank at the beginning of the dropwise addition, and when the water phase reactant is added halfway, add Na ...

Embodiment 2

[0070] This embodiment provides an emulsion-type acid thickener, which is prepared by the following method:

[0071] (1) Preparation of water phase reactants: 9g of acrylamide, 9g of N-vinylpyrrolidone, and 81g of trimethylaminopropylacrylamide chloride were dissolved in 81.85g of soft water, and 0.09g of ethylenediaminetetraacetic acid was added, Dissolve evenly. and 0.018gNa 2 SO 3 Dissolve 0.018g K in 10g soft water 2 S 2 o 8 Dissolve in 10g of soft water.

[0072] (2) Preparation of oil phase reactant: Weigh 90g of white oil, 7g of SP80 emulsifier, 2g of SP85 emulsifier, add 0.06g of dibenzoyl peroxide before emulsification.

[0073] (3) Emulsification: Circulate the oil phase reactant, drip the water phase reactant under the nitrogen condition, the dripping adopts the mode of first fast and then slow, in the process of dropping, K 2 S 2 o 8 It is added to the water phase reactant tank at the beginning of the dropwise addition, and when the water phase reactant is...

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Abstract

The invention discloses an emulsion type acid liquid thickener and a preparation method thereof, belonging to the technical field of oil and gas exploitation. The acid thickener is prepared by the following components: cationic monomer, acrylamide, N-vinylpyrrolidone, white oil, emulsifier, oil-soluble initiator, redox initiator, iron ion complexing agent, and residual amount of water; wherein, the cationic monomer is selected from at least one of trimethylaminopropyl methacrylamide chloride and trimethylaminopropyl acrylamide chloride. The emulsion-type acid liquid thickener provided in the embodiment of the present invention can be used to configure a gelling agent through the synergistic compounding of the above components, and the gelling agent is used in high-temperature storage. In the layer (for example, 180°C), its apparent viscosity is stable and remains good after shearing for 60 minutes, which is conducive to the formation of an effective acid solution distance, thereby improving the acidification effect of high-temperature deep wells in carbonate reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to an emulsion-type acid thickener and a preparation method thereof. Background technique [0002] As the main technology of carbonate reservoir stimulation, thickened acid acidizing technology has been widely used since the 1980s. The performance of acid thickener, the core additive of thickened acid, determines the performance of acid liquid such as retardation, fluid loss reduction and drag reduction performance of thickened acid, which directly affects the effect of acidification transformation. The acid thickeners tested at home and abroad mainly include modified vegetable gums, bio-glues and synthetic polymers, among which acrylamide polymers are the most developed and applied. [0003] In the prior art, the current status of acrylamide polymer thickeners: there are mainly powder type and emulsion type thickeners. For powder-type thickeners, Zhao Xiutai's re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/60C08F220/56C08F226/10C09K8/74
CPCC08F220/60C09K8/725C09K8/74
Inventor 孙川王道成吴文刚冷雨潇刘爽王川
Owner PETROCHINA CO LTD
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