Supercritical carbon dioxide cracking technology

Abstract

The invention relates to a supercritical carbon dioxide cracking technology. A supercritical carbon dioxide cracking liquid system is prepared from the following raw materials of supercritical carbon dioxide, arachidic acid, behenic acid, lignoceric acid, heptadecanoic acid, oleic acid, glycerin, cyclopentane, cyclohexane, dichloromethane, trichloromethane, 1,2-dibromobutane, 1-bromobutane and 2-chloropropane. The supercritical carbon dioxide cracking liquid system has the advantages that the preparation technology is simple, the number of operation procedures is fewer, the cracking cost is low, the effect is good, the sand carrying property is good, the water phase is small, the cracking with small water amount is realized, the damage of water phase to reservoir layer is effectively reduced, and the clay expansion is inhibited to a great degree; the construction time is effectively shortened, and the working intensity is decreased; compared with the traditional cracking type, the liquid residue is greatly reduced, and the environment-friendly and green construction purpose is realized at high efficiency.

Description

technical field [0001] The invention relates to a supercritical carbon dioxide fracturing process. Background technique [0002] Supercritical carbon dioxide jet fracturing is to generate supercritical carbon dioxide jets through jet fracturing devices, shoot through casing and reservoir rocks, form perforation holes, and then perform fracturing. The characteristics of supercritical carbon dioxide jet fracturing are: no free water, transporting proppant to form support fractures, no free water and solid residue in the support fractures, it is completely suitable for water-sensitive reservoirs, and eliminates reservoir damage. Therefore, supercritical carbon dioxide jet fracturing can improve the conductivity of reservoirs and is one of the effective means to achieve high-efficiency commercial exploitation. Supercritical carbon dioxide fracturing fluid is a mixture of viscosifiers dissolved in supercritical carbon dioxide; the fracturing fluid flowing through the jet fractur...

AI Technical Summary

Problems solved by technology

Supercritical carbon dioxide fracturing fluid is a mixture of viscosifiers dissolved in supercritical carbon dioxide; the fracturing fluid flowing through the jet fracturing device will produce a throttling effect, resulting in a drop in temperature, affecting the physical properties of the fracturing fluid and the jet fracturing effect

At present, affected by temperature, pressure and fracturing fluid viscosity, the throttling effect of supercritical carbon dioxide fracturing fluid is quite complicated, and there are few test data, and the viscosity of supercritical carbon dioxide fracturing fluid changes with temperature and pressure, which is a supercritical A Difficulty in Reservoir Development by Critical Carbon Dioxide Jet Fracturing