Composite temporary plugging agent for fracturing and preparation method of composite temporary plugging agent for fracturing

A temporary plugging agent and fracturing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature resistance of temporary plugging agents, high content of unbroken gel, and difficulty in reservoir cracks, etc. Achieve the effects of increasing reservoir productivity, efficient temporary plugging and degradation, and increasing viscosity

Pending Publication Date: 2019-10-08
SHANGHAI BRANCH CHINA OILFIELD SERVICES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The main purpose of the present invention is to provide a composite temporary plugging agent for fracturing and its preparation method to overcome the difficulty of injecting polyglycolic acid into reservoir cracks in the prior art, and the temporary plugging agent has poor temperature resistance and slow gel breaking speed. Defects with high content of residue after gel breaking and unbroken gel

Method used

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  • Composite temporary plugging agent for fracturing and preparation method of composite temporary plugging agent for fracturing
  • Composite temporary plugging agent for fracturing and preparation method of composite temporary plugging agent for fracturing
  • Composite temporary plugging agent for fracturing and preparation method of composite temporary plugging agent for fracturing

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Effect test

Embodiment 1

[0065] In this embodiment, based on the total mass of the composite temporary plugging agent, the composite temporary plugging agent includes the following components:

[0066]

[0067]

[0068] Wherein, the non-crosslinked fracturing fluid thickener comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickener):

[0069]

[0070] Wherein, the active agent is FC-911 fluorocarbon active agent.

[0071] Mix reducing gum and hydroxypropyl guar gum according to the above fracturing fluid thickener formula to obtain mixture 1, mix paraformaldehyde and potassium persulfate to obtain mixture 2, and then mix mixture 1 and 2 with FC-95 fluorocarbon active Mix the agent and stir evenly to obtain a fracturing fluid thickener.

[0072] Then, according to the formula ratio of the temporary plugging agent, mix polyglycolic acid, fracturing fluid thickener, potassium persulfate, active agent and sodium carbonate evenly, add water, and...

Embodiment 2

[0074] In this embodiment, based on the total mass of the composite temporary plugging agent, the composite temporary plugging agent includes the following components:

[0075]

[0076] Wherein, the non-crosslinked fracturing fluid thickener comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickener):

[0077]

[0078]

[0079] Among them, the activating agent is FC-911 fluorocarbon activating agent and FC-95 fluorocarbon activating agent. Based on the total mass of the composite temporary plugging agent, FC-911 fluorocarbon activating agent is 0.2 parts by mass, and FC-95 fluorocarbon activating agent is 0.2 parts by mass. The dose is 1 part by mass.

[0080] Mix reducing gum and hydroxypropyl guar gum according to the above fracturing fluid thickener formula to obtain mixture 1, mix paraformaldehyde and potassium persulfate to obtain mixture 2, and then mix mixture 1 and 2 with FC-95 fluorocarbon active Mix the age...

Embodiment 3

[0083] In this embodiment, based on the total mass of the composite temporary plugging agent, the composite temporary plugging agent includes the following components:

[0084]

[0085] Wherein, the non-crosslinked fracturing fluid thickener comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickener):

[0086]

[0087] Among them, the activating agent is FC-911 fluorocarbon activating agent and FC-95 fluorocarbon activating agent, based on the total mass of the composite temporary plugging agent, the FC-911 fluorocarbon activating agent is 0.02 parts by mass, and the FC-95 fluorocarbon activating agent is 0.02 parts by mass. The dose is 0.03 parts by mass.

[0088] Mix reducing gum and hydroxypropyl guar gum according to the above fracturing fluid thickener formula to obtain mixture 1, mix paraformaldehyde and potassium persulfate to obtain mixture 2, and then mix mixture 1 and 2 with FC-95 fluorocarbon active Mix the a...

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Abstract

The invention provides a composite temporary plugging agent for fracturing and a preparation method of the composite temporary plugging agent for fracturing. The composite temporary plugging agent isprepared from, on the basis of the total mass of the composite temporary plugging agent, 5-90% of polyglycolic acid, 0.1-3% of a non-crosslinking fracturing fluid thickening agent, 0.1-5% of an oxidant, 0.01-2% of an activating agent, 0.2-3% of inorganic base and the balance solvent. Polyglycolic acid has a great plugging performance and a complete and thorough degradation property and can be decomposed into carbon dioxide and water, and under the condition that a reservoir temperature is in a range of 30-240 DEG C, self-degradation of polyglycolic acid can be realized, and polyglycolic acid is also available for synergistic degradation with a gel breaker, so that artificially-controllable complete degradation can be realized, reservoir damages can be reduced, and reservoir production capacity is increased to the greatest extent.

Description

technical field [0001] The invention belongs to the fields of petroleum engineering and chemical industry, and relates to a temporary plugging agent for oil and gas field reservoir transformation, in particular to a composite temporary plugging agent for fracturing and a preparation method thereof. Background technique [0002] The temporary plugging agent technology used in fracturing is to plug the fractures that have been opened, hold back the pressure, and force the fracturing fractures to turn and extend. The temporary plugging agent technology must obey three principles: it can be injected, it can be blocked, and it can be released. All temporary plugging agents physically "block" reservoir fractures and hold back pressure. Temporary plugging agents are mostly granular or fibrous substances with extremely poor fluidity. To inject them into reservoir fractures, liquid injection is a construction technology problem that must be solved. For example, it is very difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/514
CPCC09K8/514C09K8/68
Inventor 罗勇姚锋盛徐波翔胡忠太李小凡李伯仁陈光利陶正闫波唐亮
Owner SHANGHAI BRANCH CHINA OILFIELD SERVICES
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