Enzyme seepage agent for improving performance of guar gum fracturing fluid and application of enzyme seepage agent

A fracturing fluid and seepage technology, applied in the fields of production fluid, drilling composition, wellbore/well components, etc., can solve problems such as difficulty in accurately controlling quantity and activation time, pumping fluctuation, formation residue, etc. Simple, smooth curve, mild gel breaking effect

CN111187608AInactive Publication Date: 2020-05-22XI'AN PETROLEUM UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-05-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an enzyme seepage agent for improving the performance of a guar gum fracturing fluid and application of the enzyme seepage agent. The enzyme seepage agent comprises the following substances in parts by mass: 5-10 parts of alpha-D-trehalose-6-corynomycolate, 5-7 parts of L-asparagine, 5-10 parts of asparaginic acid, 2-5 parts of sodium diacetate, 2-10 parts of protease, 5-10parts of mannase, 3-5 parts of cellulase and 43-73 parts of water. The substances are mixed and stirred for 30 min to 1 h at normal temperature so as to obtain the enzyme seepage agent. In application, the prepared enzyme seepage agent is added on the basis of a conventional guar gum fracturing fluid; or the prepared enzyme seepage agent is added into the cross-linking tank and mixed with a cross-linking agent to form a mixture, the mixture is swabbed to a fracturing blender truck for uniform stirring and then injected into a stratum; so the efficiency of a fracturing process is improved, oiland gas in a compact oil and gas reservoir are fully released after fracturing, and yield increase is achieved.
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Description

technical field

[0001] The invention relates to a formula of fracturing fluid for fracturing tight oil and gas layers and its application, in particular to an enzyme seepage agent for improving the performance of guar gum fracturing fluid and its application. Background technique

[0002] For the development of low-permeability, ultra-low-permeability and tight oil and gas reservoirs, fracturing is one of the most commonly used and most effective stimulation measures. The fracturing process generally uses natural plant gum guar gum and synthetic polymers to form a viscous solution of water, which is cross-linked into a colloid to carry proppant (ceramsite sand) into the oil reservoir to support each fracture, so that The oil gas trapped inside is released.

[0003] After these viscous colloidal substances enter the reservoir with proppant, they need to be broken and thinned according to the requirements, and the viscosity is required to be less than 5mPa.s. However, if the...

Examples

Embodiment 1

[0040] In this embodiment, an enzyme seepage agent for improving the performance of guar gum fracturing fluid is composed of the following substances in parts by weight: 5 parts of α-D-trehalose-6-corynebacterium mycolate are added in proportion to the mixing tank, 5 parts of L-asparagine, 5 parts of aspartic acid, 2 parts of sodium diacetate, 2 parts of protease, 5 parts of mannanase, 3 parts of cellulase, 73 parts of water, stirring at room temperature for 30min-1h Can.

[0041] The prepared enzyme permeation agent can achieve the following indicators:

[0042] Crude oil replacement rate: 62%;

[0043] Viscosity reduction rate: 95%;

[0044] Residue content reduction rate: 52%;

[0045] Scale inhibition rate: 90%.

[0046] In this example, the application of an enzyme seepage agent to improve the performance of guar gum fracturing fluid is realized through the following steps: add 0.05 parts of enzyme seepage agent to the original 1 part of guar gum fracturing fluid, and...

Embodiment 2

[0049] In this embodiment, an enzyme seepage agent for improving the performance of guar gum fracturing fluid is composed of the following substances in parts by weight: 10 parts of α-D-trehalose-6-corynebacterium mycolate are added in proportion to the mixing tank, 7 parts of L-asparagine, 10 parts of aspartic acid, 5 parts of sodium diacetate, 10 parts of protease, 10 parts of mannanase, 5 parts of cellulase, 43 parts of water, stirring at room temperature for 30min-1h Can.

[0050] The prepared enzyme permeation agent can achieve the following indicators:

[0051] Crude oil replacement rate: 67%;

[0052] Viscosity reduction rate: 98%;

[0053] Residue content reduction rate: 55%;

[0054] Scale inhibition rate: 92%.

[0055] In this example, the application of an enzyme seepage agent to improve the performance of guar gum fracturing fluid is realized through the following steps: Take 0.025 parts of enzyme seepage agent directly into the cross-linking tank and mix with ...

Embodiment 3

[0058] In this embodiment, an enzyme seepage agent for improving the performance of guar gum fracturing fluid is composed of the following substances in parts by weight: 8 parts of α-D-trehalose-6-corynebacterium mycolate are added in proportion to the stirring tank, 6 parts of L-asparagine, 7 parts of aspartic acid, 3 parts of sodium diacetate, 7 parts of protease, 6 parts of mannanase, 4 parts of cellulase, 60 parts of water, and stir at room temperature for 40 minutes.

[0059] The prepared enzyme permeation agent can achieve the following indicators:

[0060] Crude oil replacement rate: 70%;

[0061] Viscosity reduction rate: 98%;

[0062] Residue content reduction rate: 58%;

[0063] Scale inhibition rate: 94%.

[0064] In this example, the application of an enzyme seepage agent to improve the performance of guar gum fracturing fluid is realized through the following steps: Take 0.035 parts of enzyme seepage agent directly into the cross-linking tank and mix with 1 part ...