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A kind of anti-high temperature delayed gel breaker and preparation method thereof

A gel breaker and anti-high temperature technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of short delay time and achieve the effects of slowing down the temperature rise, simple preparation method, and low cost

Active Publication Date: 2018-10-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the delayed gel-breaking time of the existing capsule-wrapped delayed gel-breaker is less than 4 hours at 60°C to 80°C, and the higher the temperature, the delayed gel-breaker shorter time
In drilling construction, sometimes it is necessary to keep the jelly at high temperature for a long time before breaking. For example, the operation of the jelly valve requires the jelly valve to be kept at a high temperature of 150°C for 5 to 7 days before breaking. Therefore, the existing delayed breaking The glue cannot meet the drilling construction requirements of keeping the jelly at high temperature for a long time before breaking

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  • A kind of anti-high temperature delayed gel breaker and preparation method thereof
  • A kind of anti-high temperature delayed gel breaker and preparation method thereof

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preparation example Construction

[0032] Based on this, the second aspect of the embodiment of the present invention provides a preparation method of a high-temperature resistant delayed gel breaker using nano-silica as the shell material. The preparation method uses orthosilicate as a precursor and adopts a sol-gel method Preparation of nano-silica-coated anti-high temperature delayed breaker. Specifically, the preparation method comprises: dispersing persulfate and / or peroxide and surfactant into absolute ethanol to obtain an absolute ethanol dispersion, and then adding orthosilicate and ammonia water to the absolute ethanol dispersion , react at a temperature of 0°C to 40°C for 0.5 to 12 hours, filter, wash and dry to obtain a high-temperature resistant compound with persulfate and / or peroxide as the core material and nano-silicon dioxide as the shell material. Delayed breaker.

[0033] The above preparation method has a simple process and is easy to control, and the obtained high-temperature delayed gel-b...

Embodiment 1

[0043] This embodiment provides a high temperature resistant delayed gel breaker with a core-shell structure using nano-silicon dioxide as the shell material and ammonium persulfate as the core material.

[0044] The preparation method of this high temperature resistant delayed gel breaker is as follows:

[0045] Disperse 1 g of ammonium persulfate and 0.5 g of polyvinylpyrrolidone into 0.1 liter of absolute ethanol to obtain an absolute ethanol dispersion, and then add 10 ml of NH 3 Ammonia water with a mass percentage of 25% to 28% and 6 ml of ethyl orthosilicate were reacted at 25° C. for 4 hours. After the reaction was completed, the crude product was obtained by filtration, and the crude product was washed and dried to obtain the high temperature resistant delayed breaker of this embodiment.

[0046] Depend on figure 1 It can be seen that the peak of sulfur element comes from the core of ammonium persulfate with core-shell structure, and the peak of silicon element come...

Embodiment 2

[0049] This embodiment provides a high temperature resistant delayed gel breaker with a core-shell structure using nano-silicon dioxide as the shell material and ammonium persulfate as the core material.

[0050] The preparation method of this high temperature resistant delayed gel breaker is as follows:

[0051] Disperse 4 grams of ammonium persulfate and 0.3 grams of polyvinylpyrrolidone into 0.2 liters of absolute ethanol to obtain an absolute ethanol dispersion, then add 50 ml of NH 3 Ammonia water with a mass percentage of 25% to 28% and 70 ml of ethyl orthosilicate were reacted at 20° C. for 8 hours. After the reaction was completed, the crude product was obtained by filtration, and the crude product was washed and dried to obtain the high temperature resistant delayed breaker of this embodiment.

[0052] The morphology of the high temperature resistant delayed breaker obtained in this example is basically the same as that in Example 1. The delayed breaker can remain s...

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Abstract

Belonging to the technical field of oilfield chemistry, the invention discloses a high temperature resistant delayed gel breaking agent and a preparation method thereof. The high temperature resistant delayed gel breaking agent has a core-shell structure, the core material of the core-shell structure is sulfate and / or peroxide, and the shell material is at least one of silicon dioxide, aluminum silicate and calcium silicate. The gel breaking time of the high temperature resistant delayed gel breaking agent can reach 5-7d in a high temperature environment of more than 150DEG C, can meet the construction requirements of water-based crosslinked gel fracturing fluid and the construction requirements of gel valve isolated mineshaft in an unbalanced drilling completion operation process, and is conducive to sand carrying of fracturing fluid and shaft sealing of the mineshaft by the gel valve. In addition, the preparation method of the high temperature resistant delayed gel breaking agent is simple and is low in cost, and can realize large-scale production.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a high temperature resistant delayed gel breaker and a preparation method thereof. Background technique [0002] Gel breakers are a commonly used oilfield chemical. During oil well fracturing, a gel breaker is usually added to the water-based jelly fracturing fluid system to allow the water-based jelly fracturing fluid to break and flow back after fracturing, thereby protecting the oil reservoir. In the jelly valve isolation wellbore technology in the whole process of underbalanced drilling and completion operations, in order to ensure that the wellbore is in a safe state when tripping out and running into the completion string, and at the same time ensure that the wellbore is unblocked after the operation is completed, to avoid freezing In order to avoid the damage of the gel to the reservoir, it is also necessary to add a gel breaker to the gel solution to make the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/70
CPCC09K8/70C09K2208/26
Inventor 王在明李良川朱宽亮冯京海徐小峰沈园园吴艳
Owner PETROCHINA CO LTD
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