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Seawater-based fracturing fluid synergist and fracturing fluid and preparation method

A technology of synergist and seawater, which is applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of poor temperature resistance and large addition amount of fracturing fluid, and achieves improved temperature resistance and swelling speed. , the effect of reducing the dosage

Inactive Publication Date: 2019-10-25
DAGANG OIL FIELD GRP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The present invention aims to provide a sea-based fracturing fluid synergist, fracturing fluid and Preparation

Method used

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  • Seawater-based fracturing fluid synergist and fracturing fluid and preparation method

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Embodiment 1

[0017] Embodiment 1: The preparation method of the sea-based fracturing fluid synergist, normal temperature and pressure, stirring, adding 60kg of clear water, 25kg of ethylenediaminetetramethylene phosphate sodium, and 25kg of glycerin in the reactor and fully mixing in proportion to form Uniform solution to make synergist.

Embodiment 2

[0018] Embodiment 2: The preparation method of the sea-based fracturing fluid synergist, normal temperature and pressure, stirring, adding 50kg of clear water, 20kg of ethylenediaminetetramethylene phosphate sodium, and 15kg of glycerin in the reactor and fully mixing in proportion to form Uniform solution to make synergist.

Embodiment 3

[0019] Embodiment 3: The preparation method of the sea-based fracturing fluid synergist, normal temperature and pressure, stirring, adding 50kg of clear water, 25kg of ethylenediaminetetramethylene phosphate sodium, and 25kg of glycerin in the reactor and fully mixing in proportion to form Uniform solution to make synergist.

[0020] Embodiment 3 is the best embodiment, and it will be described by taking Embodiment 3 as an example.

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Abstract

The invention belongs to the field of oilfield fracturing fluids, and particularly relates to a seawater-based fracturing fluid synergist and a fracturing fluid and a preparation method. The seawater-based fracturing fluid synergist comprises the following components in parts by mass: 50-60 parts of clean water, 20-25 parts of sodium ethylenediamine tetramethylene phosphate, and 15-25 parts of a polyol. The main role of the synergist is in two aspects, on the one hand, sodium ethylenediamine tetramethylene phosphate is added, multiple metal ions can be chelated, and a plurality of monomeric structure macromolecular network complexes are formed and loosely dispersed in water, so that normal crystallization of calcium and magnesium are destroyed, the effect of calcium and magnesium ions on swelling of guar gum is reduced, a swelling speed is greatly improved, and thereby a use amount of modified guar gum in the seawater-based fracturing fluid is reduced by 15% under the same conditions,and continuous blending of the seawater-based fracturing fluid can be realized; the risk of precipitation of calcium and magnesium ions in seawater is reduced; and on the other hand, the polyol is compounded, temperature resistance of the modified guar gum seawater-based fracturing fluid can be effectively improved, and needs for fracturing construction are met.

Description

technical field [0001] The invention belongs to the field of oilfield fracturing fluid, and in particular relates to a seawater-based fracturing fluid synergist, fracturing fluid and a preparation method. Background technique [0002] In order to chelate calcium and magnesium ions in seawater, the existing seawater-based modified guar gum fracturing fluid is added with a relatively high amount of single-component chelating agent to reduce the swelling of modified guar gum molecules caused by divalent ions such as calcium and magnesium. However, in order to obtain high-temperature-resistant seawater-based fracturing fluid, it is still necessary to (1) increase the amount of thickener (above 0.65%); (2) add a large amount of temperature-resistant enhancer and oxygen scavenger; (3) Add a pH regulator containing hydroxide ions or carbonate ions to improve the high temperature resistance of the fracturing fluid. This will inevitably lead to excessively high viscosity in the frac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/605C09K8/68C09K8/685C09K8/887C09K8/90C09K8/905
Inventor 陈紫薇贾云鹏付大其刘学伟赵玉东闫阳构晓婷张润泽赵冬华
Owner DAGANG OIL FIELD GRP
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