Low-temperature rubber crushing accelerator for well fracturing

Abstract

The invention discloses a low-temperature rubber crushing accelerator for well fracturing. The low-temperature rubber crushing accelerator for well fracturing can effectively restrain clay hydration expansion, prevents pore plugging and improves reservoir permeability. As to an oil well of which the temperature of an oil layer is smaller than or equal to 50 DEG C, a prescription of fracturing fluid added with an accelerator is adopted, the low-temperature rubber crushing performance of the fracturing fluid is improved, and the problems that the fracturing fluid is not thoroughly hydrated, the flowback is difficult, and secondary pollution of the oil layer is generated are solved. The low-temperature rubber crushing accelerator is applied to a new well of a well area and a hollow well of an old area; the economic benefit of oil enhancement is remarkable, and the low-temperature rubber crushing accelerator has the advantages that the preparation method is simple, and no secondary damage to the oil layer is generated, and preparation at normal temperature can be achieved, can be widely applied to low-temperature oil well fracturing construction. Compared with the prior art, the low-temperature rubber crushing accelerator has the advantages that the cementing quality is high, the toxic property of the product is small, and pollution on stratum after use is light.

Description

technical field [0001] The invention relates to the technical field of petroleum fracturing well oil production under international patent classification C09K, in particular to a low-temperature gel-breaking accelerator for oil well fracturing. Background technique [0002] At present, the commonly used fracturing measures have a high success rate of oil recovery. Aiming at the problem of poor fracturing effect caused by clay swelling in the formation of newly launched wells and low temperature in shallow wells, after indoor fracturing fluid anti-swelling test and fracturing There are many technical proposals for improving fracturing fluid formulations in low-temperature gel breaking experiments. [0003] Reservoir fracturing is a fracturing vehicle that squeezes fracturing fluid into the oil layer through high pressure and large displacement to press out the fractures. The fracturing fluid carries proppant, such as quartz sand, to fill the fractures, thereby improving the p...

AI Technical Summary

Problems solved by technology

[0006] The beneficial effects of the invention are: it can effectively inhibit the hydration expansion of clay, prevent pore blockage, and increase the permeability of oil layers; for oil wells with an oil layer temperature ≤ 50°C, the fracturing fluid plus accelerator formula is used to improve the low-temperature gel-breaking performance of the fracturing fluid , to solve the problems of incomplete hydration of fracturing fluid, difficult flowback and secondary pollution of oil layers