Slick water fracturing fluid for tight sandstone reservoirs and application thereof

Abstract

The invention provides a slick water fracturing fluid for tight sandstone reservoirs and application thereof. The slick water fracturing fluid comprises, by weight, 0.15%-0.35% of a thickener, 0.03%-0.05% of a clay stabilizer, 0.03%-0.05% of a cleanup additive, 0.20%-0.50% of a complexing agent and 0.02%-0.05% a gel breaker, with the balance being water. The slick water fracturing fluid of the invention can swell quickly and achieve continuous blending, and is not easily affected by bacteria, not prone to decay, low in construction friction and capable of realizing large-displacement continuous construction; sand carrying in the whole process can be realized by adjusting the concentration of the thickener; a flowback fluid can be repeatedly used through simple filtration in recovery of theflowback fluid; and the slick water fracturing fluid has the advantages of simple process, high utilization rate, low cost and good economic benefits.

Description

technical field [0001] The invention relates to the field of low-permeability oil and gas fields, in particular to a slick water fracturing fluid for tight sandstone reservoirs and an application thereof. Background technique [0002] Fracturing has been developed rapidly and widely used as the main production and injection measures of oil and gas reservoirs. Fracturing is the use of pressure to open formations to form fractures and support them with proppant to reduce fluid flow resistance and increase production and injection measures. The purpose of fracturing is to form fractures with conductivity in the formation. The fracturing fluid used determines the fracturing effect to a large extent. At the same time, there are certain requirements for the viscosity of the fracturing fluid so that it can Fluids known as low viscosity flow back easily to avoid damage to hydrocarbon layers in the formation. [0003] The most commonly used fracturing fluids at home and abroad are ...

AI Technical Summary

Problems solved by technology

However, guar gum and its modified products have the inherent disadvantages of easy corruption of vegetable gum, and the composition of the fracturing fluid system is complex. The formation of jelly depends on chemical cross-linking. After the gel is broken, the flowback fluid is difficult to treat, the cost is high, and reuse is feasible. poor sex

Since the above defects of plant gum fracturing fluids such as guar gum can neither alleviate the pressure of environmental protection nor meet the above-mentioned on-site construction requirements, polymer fracturing fluids are widely used to solve the above problems

[0004] At present, there are many kinds of acrylamide polymer thickeners, among which the thickeners of guar gum and its derivatives are the most widely used, but there are common problems such as incomplete gel breaking, easy gel return, and high residue content of gel breaking liquid. The problem is that it is easy to cause blockage damage, resulting in a decrease in matrix permeability and fracture conductivity, thereby affecting the fracturing effect. At the same time, the friction of vegetable gum fracturing fluid pipelines is high, resulting in higher wellhead pressure at the same displacement, resulting in More hydraulic power loss and higher construction risk

Synthetic polymer thickeners mainly include polyacrylamide, sodium polyacrylate, polyacrylate and polyvinyl alcohol, etc., which generally have the characteristics of strong thickening ability, good gel breaking performance, and less residue, and are widely used, but the cost is common Higher, do not take advantage of on-site promotion applications