Nanoparticle composite high-temperature guar gum fracturing fluid

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...

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