Breakers for foam-like fracturing fluids

Abstract

The invention discloses a gel breaker suitable for a foam-like fracturing fluid, wherein the gel breaker is selected from one or both of iodate and bromate; the iodate is selected form one or more of potassium periodate, sodium periodate, potassium iodate and sodium iodate; and the bromate is selected from one or both of potassium bromate and sodium bromated. The gel breaker has beneficial effects that: the gel breaker has advantages of small usage amount, and rapid and thorough gel breaking. Under low temperature, a small amount of the gel breaker is added, rapid and thorough gel breaking for the fracturing fluid can be implemented, gel breaking time is short, gel breaking effect is good, and solves a gel breaking problem of the foam-like fracturing fluid.

Description

technical field [0001] The present invention relates to a breaker suitable for foam-like fracturing fluids. Background technique [0002] For low-permeability tight reservoirs, even if the fracturing fluid itself is low in damage, if the fracturing fluid has a slow flowback rate and a low flowback rate, it will stay in the formation by increasing the water saturation of the reservoir, increasing the two-phase seepage resistance, and producing Damage such as water sensitivity and water lock will greatly reduce the porosity and permeability of the formation, and even seal the oil and gas layers, which will seriously affect the stimulation effect of fracturing and even have no productivity after fracturing. In order to solve the flowback problem, the whole process of liquid nitrogen co-injection is adopted, and the average amount of liquid nitrogen per well is 5-10m 3 However, liquid nitrogen co-injection brings great trouble to on-site construction, and there are also major p...

AI Technical Summary

Problems solved by technology

The gel breakers commonly used in the field can be classified into the following categories: ① Peroxides, such as ammonium persulfate, potassium persulfate, etc., are used at a temperature above 50°C. When the temperature is lower than 50°C, they release free oxygen. If the speed slows down or stops, the fracturing fluid will not have or partially play the role of breaking the gel; ②Enzyme can be used for breaking the gel at a lower temperature, but it must be maintained at a low pH value when used. Enzymes will play the role of gel breaking, harsh application conditions and expensive costs restrict its large-scale application; ③ potential acid, such as ethyl acetate organic matter, it mainly depends on its hydrolysis into acid to change the pH value of the system to destroy The structure of the fracturing fluid

Images