Inorganic boron high-temperature delayed fracturing fluid

Abstract

The invention relates to inorganic boron high-temperature delayed fracturing fluid. A base fluid system is prepared from the following components in part by weight: 96.5 to 97.9 parts of water, 0.35 to 0.4 part of guar gum and derivatives thereof, 0.1 to 1.0 part of sodium hydroxide and sodium thiosulfate composite, 0.5 part of hydrocarbon emulsifier, alkane sulfonate emulsifier or alkyl sulfate emulsifier, 1.0 part of material consisting of a single component or multiple components including KCl, NH4Cl and cationic quaternary ammonium salt polymer, 0.1 part of formaldehyde, glutaraldehyde ordodecyl benzyl ammonium chloride and 0.05 to 0.5 part of mixture of glycol and sodium hydroxide. The inorganic boron high-temperature delayed fracturing fluid is prepared from 100 parts of the base fluid system and 0.7 to 1.0 part of an inorganic boron compound and borax / boric acid composite added with sodium hydroxide for regulating pH value to greater than 7. The concentration of the guar gum and the concentration of the derivatives of the guar gum are reduced, the broken gum residue is reduced, and thus, the damage of the fracturing fluid to propping fractures and reservoir strata are relieved.

Description

Technical field: [0001] The invention relates to a fracturing fluid used in the fracturing and stimulation process of natural gas wells, specifically a water-based fracturing fluid with guar gum and its derivatives as thickening agent and inorganic boron compound as crosslinking agent. Fracturing fluid. Background technique: [0002] At present, most of the fracturing fluids used when high-temperature liquid systems are required in the fracturing of oil and gas fields are fracturing fluids that use guar gum and its derivatives as thickeners, and organic boron or organic boron and zirconium composites as crosslinking agents. liquid, generally has the following disadvantages: [0003] 1. In order to ensure the smooth progress of fracturing construction, most fracturing fluids used in fracturing construction use thickeners with relatively high concentrations. Due to the large content of thickeners in fracturing fluids and the high content of residues after gel breaking, it is ...

AI Technical Summary

Problems solved by technology

[0003] 1. In order to ensure the smooth progress of fracturing construction, most fracturing fluids used in fracturing construction use thickeners with relatively high concentrations. Due to the large content of thickeners in fracturing fluids and the high content of residues after gel breaking, it is difficult to support fractures. and reservoir damage;

[0004] 2. Compared with inorganic boron cross-linking agents such as borax, it is more difficult to break the gel in the fracturing fluid system using organic boron or organic boron and zirconium as the cross-linking agent. In order to ensure that the fracturing fluid can completely break the gel and flow back after construction , the amount of gel breaker is large, and the gel breaking efficiency is low;

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