Low-viscosity and high-elasticity non-crosslinking fracturing fluid and preparation method thereof

A non-crosslinking, fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor salt tolerance of vegetable gum, insufficient sand-carrying ability, and large reservoir damage, etc. The effect of low cost, easy operation and high safety

Active Publication Date: 2014-06-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the price of vegetable gum rises, the cost of vegetable gum as a thickener is getting higher and higher, and vegetable gum has disadvantages such as poor salt tolerance and large reservoir damage.
Xanthan gum is a cheap, easy-to-obtain and high-performance biopolysaccharide thickener that can replace plant gum. However, xanthan gum is prone to degradation at high temperatures, and it will be used as a fracturing fluid thickener in high-temperature well fracturing. Problems leading to insufficient sand-carrying capacity

Method used

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  • Low-viscosity and high-elasticity non-crosslinking fracturing fluid and preparation method thereof
  • Low-viscosity and high-elasticity non-crosslinking fracturing fluid and preparation method thereof
  • Low-viscosity and high-elasticity non-crosslinking fracturing fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides a xanthan gum esterification derivative, which is prepared by the following steps:

[0031] Add 10 parts by weight of xanthan gum to 100 parts by weight of ethanol hydrochloric acid solution with a concentration of 2wt%, stir and react for 3 hours, filter with suction, wash with water until there is no chloride ion in the lotion, dry in vacuum for 24 hours, and then dissolve the dry product in 100 In parts by weight of ethylene glycol monobutyl ether, dropwise add 15 parts by weight of haloalkane (wherein haloalkane is a mixture of 1-chlorooctane and 2-chloropentane at a ratio of 4:1), stir and react for 12 hours, and add excess Potassium chloride solution, stirred for 24 hours, the stirred product was precipitated and filtered with glycerol, dissolved in an appropriate amount of water, dialyzed in distilled water until there was no chloride ion, and the dialyzed product was dried at 90°C to constant weight and then ground into powder, and Pass ...

Embodiment 2

[0033] This embodiment provides a hydroxypropylated derivative of xanthan gum, which is prepared through the following steps:

[0034] Add 20 parts by weight of xanthan gum into a three-necked bottle, add 150 parts by weight of isopropanol, and add 15 parts by weight of NaOH solution with a concentration of 5wt% dropwise under stirring, and alkalize at room temperature for 2 hours;

[0035] Nitrogen gas was introduced at a pressure of 0.1MPa, and after swelling at room temperature for 4 hours, the temperature was raised to 80°C, and 20 parts by weight of isopropanol were slowly added dropwise to the halogenated alkanes (wherein the halogenated alkyls were 1-chlorooctane and 1-bromooctane ratio of 3:1 mixture), nitrogen was introduced again, and reacted at this temperature for 5 hours;

[0036] Filter the reaction product, then wash with n-hexane and 80% acetone, soak, and suction filter to remove the residue, neutralize with glacial acetic acid or boric acid to pH=7-8, filter ...

Embodiment 3

[0038] This embodiment provides a carboxymethylated derivative of xanthan gum, which is prepared through the following steps:

[0039] Get a three-necked flask, add 200 parts by weight of absolute ethanol and 15 parts by weight of xanthan gum, add 20 parts by weight of NaOH solution with a concentration of 5wt% dropwise under stirring, alkalize for 4 hours at normal temperature, then slowly add 10 parts by weight of chlorine Acetic acid, control the reaction temperature to 70°C, stop after stirring for 24 hours;

[0040] Cool the flask to room temperature, add glacial acetic acid or boric acid to adjust the pH value to 7 while stirring, and finally separate the solid phase product and wash it with absolute ethanol; place the washed product in a constant temperature drying oven and dry it at 80-90°C After reaching a constant weight, it is ground into powder to obtain carboxymethylated xanthan gum derivatives.

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Abstract

The invention relates to a low-viscosity and high-elasticity non-crosslinking fracturing fluid which comprises the following components: 0.15-2.0 parts by weight of thickening agent, 0.02-2.0 parts by weight of gel breaker and 100 parts by weight of water, wherein the thickening agent is one or more than one of a xanthan gum esterification derivative, a xanthan gum hydroxypropylation derivative and a xanthan gum carboxymethylation derivative. The invention further provides a preparation method of the low-viscosity and high-elasticity non-crosslinking fracturing fluid. The low-viscosity and high-elasticity non-crosslinking fracturing fluid has the advantages of high viscosity, high dissolving speed, temperature resistance, shearing resistance, and salt resistance, and can be easily broken; and the low-viscosity and high-elasticity non-crosslinking fracturing fluid is a novel fracturing liquid which is low in price, easy to obtain, and easy to operate, and can be used in all phases of fracturing construction. The instant dissolving characteristic of the low-viscosity and high-elasticity non-crosslinking fracturing fluid is especially suitable for online liquid preparation, and the fracturing factorized operation is favorably realized.

Description

technical field [0001] The invention relates to a low-viscosity, high-elasticity non-crosslinked fracturing fluid and a preparation method thereof, which belong to the technical field of petroleum exploitation. Background technique [0002] With the deepening of oil and gas reservoir development, the number of medium and low permeability reservoirs is increasing. Hydraulic fracturing is an effective method to transform oil and gas reservoirs and obtain industrial production capacity. In the process of fracturing construction, the performance of fracturing fluid is directly related to the success or failure of fracturing construction and the effect of post-fracture stimulation. [0003] At present, water-based fracturing fluid is still the main body of fracturing fluid due to its convenient use and stable performance, and the thickener of water-based fracturing fluid is mostly vegetable glue. As the price of vegetable gum rises, the cost of vegetable gum as a thickener is ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/605C09K8/665C09K8/68C09K8/90C09K2208/24C09K2208/26
Inventor 翟文卢拥军程兴生管保山王丽伟刘玉婷
Owner PETROCHINA CO LTD
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