Acidic water repellent associated matter fracturing fluid

Abstract

The invention relates to acidic water repellent associated matter fracturing fluid. The fracturing fluid consists of crosslinked fluid and original fluid, wherein the crosslinked fluid comprise the following components in percentage by weight: 0.2 to 0.5 percent of acidic crosslinked agent, 0.01 to 0.035 percent of crosslinked regulator A, 0.02 to 0.3 percent of crosslinked regulator B, 0.02 to 0.2 percent of gelbreaker and the balance of water; and the original fluid comprises the following components in percentage by weight: 0.3 to 0.7 percent of FS-927 polymer, 1 to 4 percent of potassium chloride, 0.5 to 1.5 percent of MJ-1 high-temperature discharge aiding agent, 0 to 2.5 percent of JTY-100 fluid loss agent, 1 percent of PR-1 demulsifier, 0 to 0.02 percent of temperature stabilizer and the balance of water. The fracturing fluid has the advantages of high crosslinking delaying performance, temperature resistance, salt resistance and shearing resistance, high sand carrying capacity, small damages to stratum, low friction resistance, low residue amount and good expansion preventing effect, can easily break gel and flow back, and breaks through the traditional concept that retarded crosslinking polymer fracturing fluid has temperature resistance and sheering resistance which can be realized at the temperature of not more than 100 DEG C.

Description

technical field [0001] The invention relates to an acidic hydrophobic association compound fracturing fluid for oil and gas reservoirs or strongly water-sensitive formations for fracturing stimulation. Background technique [0002] At present, the fracturing fluid system mainly includes vegetable gum fracturing fluid, oil-based fracturing fluid, foam fracturing fluid, emulsified fracturing fluid, and viscoelastic clean fracturing fluid, among which vegetable gum fracturing fluid is used more. The development trend of fracturing fluid is towards high efficiency and low damage. For this reason, since the 1990s, a viscoelastic clean fracturing fluid without water insolubles and residues has been developed, but the application temperature of this system is relatively low. There are viscoelastic clean fracturing fluids with operating temperatures up to 130°C reported abroad, but the operating temperatures of viscoelastic clean fracturing fluids reported in China are lower than 1...

AI Technical Summary

Problems solved by technology

Compared with natural polymers, these polymers have the characteristics of strong thickening ability, good gel breaking performance, and less residue, but synthetic polymer fracturing fluids also have many disadvantages, such as low temperature resistance, poor shear stability, etc.

There are many studies on polymer fracturing fluid in China, and good application results have been achieved, but the polymer fracturing fluid also has certain shortcomings, such as: mainly using inorganic or organometallic compounds as cross-linking agents and under alkaline conditions Lower cross-linking, poor temperature resistance, salt resistance, and shear resistance; when constructing water-sensitive formations, it is difficult to obtain an economical clay stabilizer that is well compatible with polymer fracturing fluid systems

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