Temporary plugging agent for well killing and preparation method thereof

A temporary plugging agent and well killing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low applicable temperature and high reservoir damage rate, and achieve a wide applicable temperature range and short plugging time. , the effect of high viscosity

Inactive Publication Date: 2019-11-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In related technologies, due to the use of artificially synthesized polymer thickeners, even under the action of oxidative gel breakers, gel breaking can be achieved, but the damage rate to the reservoir is relatively high
Moreover, the applicable temperature of the temporary plugging agent is relatively low, and it is not suitable for well killing operations above 70 °C

Method used

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  • Temporary plugging agent for well killing and preparation method thereof
  • Temporary plugging agent for well killing and preparation method thereof
  • Temporary plugging agent for well killing and preparation method thereof

Examples

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preparation example Construction

[0067] On the other hand, an embodiment of the present invention provides a method for preparing a temporary plugging agent for well killing, the method is applied to any of the temporary plugging agents mentioned above, and the method includes:

[0068] According to the mass percentage of each component, oil is added into the first reactor, and the first stirrer is stirred at a first preset rotation speed.

[0069] Add dispersant to the first reactor, stir to dissolve evenly, then add cross-linking monomer, stir evenly. Wherein, the cross-linking monomer is vegetable gum.

[0070] Water is added to the second reactor and the second stirrer is stirred at a second preset speed.

[0071] Add polyol, crosslinking agent and gel breaker into the second reactor, stir and dissolve evenly.

[0072] Pour the mixed system in the first reactor into the second reactor, and stir evenly at the third preset rotation speed to obtain the temporary blocking agent.

[0073] The above-mentione...

Embodiment 1

[0080] This embodiment provides a temporary blocking agent, which is prepared by the following method:

[0081] Add 0.5 kg of 5# white oil in 5 liters of reaction kettle A with the first stirrer, open the first stirrer, and the rotating speed is 800 rpm. Add 0.3 kg of Span 80 into reaction kettle A, stir to mix and dissolve evenly. Then add 0.6 kilograms of squash gum in the reaction kettle A, stir and mix evenly, obtain viscous, pasty mixture.

[0082] Add 45.87 kilograms of tap water in 80 liters of reaction kettle B with the second agitator, open the second agitator, and the rotating speed is 300 rpm. Add 1.5 kg of sorbitol, 1.2 kg of sodium tetraborate and 0.03 kg of sodium persulfate into reaction kettle B, stir to mix and dissolve evenly.

[0083] Pour all the mixed system in reactor A into reactor B, and continue stirring at a stirring speed of 300 rpm for 10 minutes to obtain 50 kg of suspension-like temporary plugging agent for killing wells provided in this example...

Embodiment 2

[0085] This embodiment provides a temporary blocking agent, which is prepared by the following method:

[0086]Add 2.4 kg of methyl silicone oil to 10 liters of reactor A with the first stirrer, and turn on the first stirrer at a speed of 900 rpm. Add 0.8 kg of oleic acid in reactor A, stir and mix, and dissolve evenly. Then add 2.4 kilograms of guar gum in reactor A, stir and mix evenly, obtain viscous, pasty mixture.

[0087] Add 37.1 kilograms of tap water in 80 liters of reaction kettle B with the second agitator, open the second agitator, and the rotating speed is 200 rpm. Add 4.5 kg of triethylene glycol, 2.4 kg of sodium tetraborate and 0.4 kg of potassium persulfate into reaction kettle B, stir to mix and dissolve evenly.

[0088] Pour all the mixed system in reactor A into reactor B, and continue stirring at a stirring speed of 200 rpm for 10 minutes to obtain 50 kg of suspension-like temporary plugging agent for killing wells provided in this example.

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Abstract

The invention discloses a temporary plugging agent for well killing and a preparation method thereof, and belongs to the field of oilfield chemistry. The temporary plugging agent for well killing is obtained by crosslinking the following components in percentage by mass: 1.0%-5.0% of a crosslinking monomer, 1.0%-5.0% of oil, 0.5%-2.0% of a dispersing agent, 2.0%-5.0% of a crosslinking agent, 2.0%-10.0% of polyol, and 0.05%-1.0% of a gel breaker, with the balance being water, and the crosslinking monomer being plant gum. The temporary plugging agent is low in viscosity before gelling, easy to pump and inject, high in viscosity after gelling, wide in applicable temperature range, capable of resisting high temperature of 120 DEG C, capable of quick gel breaking after being in contact with acidic substances, short in plug removal time and small in damage to a reservoir after plant gum breaking.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a temporary plugging agent for well killing and a preparation method thereof. Background technique [0002] Before workover operations in oil and gas wells, in order to avoid blowouts, high-density well killing fluids are generally required for circulating well killing. However, the commonly used inorganic salt well killing fluid or organic salt well killing fluid has limited density, and there are safety risks such as well kick and blowout for high pressure oil and gas wells. Adding barite, iron ore powder, etc. to the killing fluid can increase the density of the killing fluid, but there are problems such as settlement, poor stability, great damage to the formation, and affecting the productivity of oil and gas wells. Moreover, after killing the well, it is necessary to release the well killing effect. Based on the above, it is very necessary to provide a temporary plugging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514
Inventor 熊颖刘友权张亚东龙顺敏蒋泽银李伟石晓松唐永帆陈楠
Owner PETROCHINA CO LTD
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