Association type high-temperature resistant fracturing fluid suitable for volcanic rock fracture

Abstract

The invention provides an association type high-temperature resistant fracturing fluid suitable for volcanic rock fracture. The fracturing fluid comprises two parts, namely a base liquid and construction additives. The base liquid comprises following components by weight: 0.5-0.9% of a thickening agent and 0.2-0.3% of a flow promoter, with the balance being water. The construction additives comprise a thickening auxiliary agent and a gel breaker. The thickening auxiliary agent is 0.25-0.45% by weight of the base liquid. The gel breaker is 0.02-0.05% by weight of the base liquid. The fracturing fluid belongs to supramolecular structure fluids, and has good viscoelasticity, thus achieving viscoelastic sand carrying. The fracturing fluid has characteristics of capability of being clean and free of residue, good temperature resistance, shearing resistance, shearing dilutability, and the like. During fracturing construction, the fracturing liquid can reduce friction so as to reduce the construction pressure, and the fracturing liquid is low in harm to a reservoir stratum, thus increasing the success rate of fracturing construction, improving fracturing effects, and increasing the productivity of the reservoir stratum. The fracturing liquid is suitable for fracturing transformation of a volcanic rock reservoir stratum.

Description

technical field [0001] The invention relates to the technical fields of oilfield chemistry and fracturing stimulation, in particular to an association polymer fracturing fluid suitable for fracturing volcanic formations, and the fracturing fluid is suitable for formations with a relatively high temperature of 120-160°C. Background technique [0002] The geological conditions of volcanic rock gas reservoirs are very complex, with rapid changes in lithology and lithofacies, strong heterogeneity, start-up pressure, poor physical properties in general, low natural production capacity, and fracturing is required to put into production, so fracturing is the key to developing volcanic rock reservoirs Layers of effective means. Compared with sandstone reservoirs, volcanic rocks have higher requirements on the performance of fracturing fluids due to their unique rock mechanical properties and reservoir space. [0003] The difficulties in the development of volcanic rock reservoirs a...

AI Technical Summary

Problems solved by technology

At present, the commonly used guar gum fracturing fluid system needs to add chemical additives such as cross-linking agent and bactericide, and the residue content is high after the gel is broken, it is not easy to flow back, and it will cause great damage to the formation; due to the high viscosity of the cross-linked gel, the frictional resistance Increased, further increasing the difficulty of fracturing construction

In recent years, clean fracturing fluids have been developed at home and abroad, which can greatly reduce the damage of fracturing fluids to formations, and at the same time reduce friction better. However, due to their poor temperature resistance, they are not universally applicable.

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