A novel aluminium cross-linking agent for a low-carbon hydrocarbon waterless fracturing fluid, a preparing method thereof and applications of the cross-linking agent

Abstract

A novel aluminium cross-linking agent for a low-carbon hydrocarbon waterless fracturing fluid, a preparing method thereof and applications of the cross-linking agent are provided. The aluminium cross-linking agent comprises 20-27 parts by mass of a main agent, 3-7 parts by mass of a cross-linking accelerant and 45-60 parts by mass of water. The preparing method includes adding the water of a certain ratio into a reaction container, adding the main agent, reacting under fully stirring, adding the cross-linking accelerant and reacting under stirring for 15 min. The cross-linking agent is high in crosslinking speed with a gelatinizing agent, stable in gel formation, simple and convenient to prepare and low in cost, and a fracturing fluid system has high resistance to temperatures and shearing and good effects on unconventional high-temperature reservoir stratum fracturing.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a novel low-carbon hydrocarbon anhydrous fracturing fluid aluminum crosslinking agent and a preparation method and application thereof. Background technique [0002] As high-quality energy for national economic and social development, oil and natural gas are of great significance to ensure the sustained and rapid development of national economy and society. In recent years, with the rapid development of my country's economy, the contradiction between supply and demand of oil and gas has intensified, and the import of crude oil has increased year by year. However, conventional oil and gas resources are facing the problem of severe reduction or even depletion of production capacity, which makes shale gas, coal bed methane, tight oil and gas and other unconventional oil and gas resources more and more valued by countries all over the world. my country's unconventiona...

AI Technical Summary

Problems solved by technology

Fe 3+ Metal salt is used as the main agent, and trivalent aluminum salt is mainly used in oil-based fracturing fluid. Usually, ferric salt is directly used as a cross-linking agent to cross-link with dialkyl phosphate. The cross-linking process is very slow and the operation is cumbersome. , complex liquid preparation, difficult to control, slow solubility of cross-linking agent, poor stability, and particularly high requirements for fracturing construction

[0005] Chinese patent CN104498017A discloses a fracturing fluid cross-linking agent and its preparation and application, but the temperature resistance and sand-carrying ability of the fracturing fluid prepared by this cross-linking agent have not been improved, and the temperature resistance is only 90°C. Not suitable for medium and high temperature oil fields and ultra-deep complex wells

Moreover, the components of the crosslinking agent are complex, the preparation is cumbersome, and alcohol and water are used as mixed solvents, so there are certain safety hazards in the on-site operation.

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