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Nanoparticle composite high-temperature guar gum fracturing fluid

A technology of nano-particles and fracturing fluids, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as difficulty in large-scale promotion, and achieve the effect of improving temperature resistance

Inactive Publication Date: 2018-12-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to disperse nanoparticles under ultrasonic conditions, which is very inconvenient in the field of oil and gas fields, so this technology is difficult to be widely promoted in the field

Method used

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  • Nanoparticle composite high-temperature guar gum fracturing fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Nanoparticle SiO 2 Or the surface modification process of ZnO is as follows: in 50ml ethanol solution, add 11g of 3-aminopropyltriethoxysilane, then add 6g into nanoparticles, react for 40min, add 0.02g sodium lauryl sulfate and 5 g of acrylic monomer, initiated with 0.01 g of ammonium persulfate.

[0023] Add 30kg of water into the reaction tank, and slowly inhale 0.02kg of surface-modified SiO 2 Particles, slowly inhale 0.3kg hydroxypropyl guar gum, disperse evenly, add 0.4g choline chloride; add 0.4kg surfactant, and 0.1kg sodium thiosulfate. Add 68.78 kg of water, and then stir at room temperature for 30 minutes to obtain the nanocomposite guar gum fracturing fluid base fluid. Before construction, add triethanolamine boron complex in the stirring tank according to the ratio of 100:0.3.

Embodiment 2

[0025] Add 30kg of water into the reaction tank, slowly inhale 0.04kg of surface-modified ZnO particles, then slowly inhale 0.5kg of carboxymethylhydroxypropyl guar gum, and add 0.5g of NH 4 Cl; add 0.3kg surfactant and 0.2kg sodium thiosulfate. Add 68.46 kg of water, and then stir at room temperature for 30 minutes to obtain the nanocomposite guar gum fracturing fluid base fluid. Before construction, add triethanolamine boron complex in the stirring tank according to the ratio of 100:0.5.

Embodiment 3

[0027] Add 50kg of water in the reaction tank, slowly inhale 0.06kg of surface-modified ZnO particles, then slowly inhale 0.6kg of hydroxypropyl guar gum, and add 0.4g of choline chloride after the dispersion is uniform; add 0.5kg of surfactant and 0.3 kg sodium thiosulfate. Add 48.14 kg of water, and then stir at room temperature for 30 minutes to obtain the nanocomposite guar gum fracturing fluid base fluid. Before construction, add triethanolamine boron complex in the mixing tank according to the ratio of 100:0.6.

[0028] From figure 1 It can be seen from the figure that under the same formulation conditions, the viscosity of the fracturing fluid without nanoparticles decreases to 50mpa.s after shearing at 150°C for 30 minutes, which cannot meet the construction requirements. However, after adding nanoparticles, the viscosity has been maintained at 120mpa.s, which can fully meet the needs of construction.

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Abstract

The invention relates to a nanoparticle composite high-temperature guar gum fracturing fluid which comprises a base liquid and a crosslinking agent, wherein the mass ratio of the base liquid to the crosslinking agent is 100:(0.3-0.6); the base liquid comprises the following components in percentage by mass: 0.3-0.6% of a thickening agent, 0.02-0.06% of water-soluble nanoparticles, 0.3-0.5% of a clay stabilizing agent, 0.3-0.5% of a surfactant, 0.1-0.3% of a temperature stabilizing agent and the balance of water; the crosslinking agent is a triethanolamine boron complex; the thickening agent isany one of hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum; the water-soluble nanoparticles are SiO2 or ZnO granules of which the particle sizes are 1-10 nm after surface modification; a surface modification method of the water-soluble nanoparticles comprises the following steps: putting 5-15 g of 3-aminopropyl triethoxysilane into 50 ml of an ethanol solution, further adding 4-8g of SiO2 or ZnO nanoparticles, enabling the components to react for 40 minutes, adding 0.01-0.03 g of lauryl sodium sulfate and 4-7 g of an acrylic monomer, and carrying out initialization with 0.01-0.03 g of ammonium persulfate. Due to adoption of the nanoparticles, the network structure of the fracturing fluid can be improved, the temperature resistance and the shearing resistance of the fracturing fluid can be improved, and wide market application prospects can be achieved.

Description

technical field [0001] The invention relates to a fracturing fluid system used in the production stimulation process of oil and gas fields in the field of petroleum and natural gas exploration and development, in particular to a nanoparticle composite high-temperature guar gum fracturing fluid. Background technique [0002] Fracturing fluid is the key to ensure the normal operation of fracturing, and the performance of fracturing fluid is the focus of attention during construction. The existing water-based fracturing fluid system mainly composed of guar gum can satisfy the construction of wells with reservoir temperatures below 150 degrees Celsius, but with the development of more and more reservoirs with well temperatures above 150 degrees Celsius, the fracturing The performance of the liquid puts forward new requirements. In order to meet the requirements of high-temperature wells, the performance of fracturing fluid can be improved to a certain extent by using modified g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/887C09K8/90
Inventor 王世彬石磊李杨郭建春陈睿飏申鑫
Owner SOUTHWEST PETROLEUM UNIV
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