Directly blendable seawater-based variable viscosity fracturing fluid and preparation method thereof

Abstract

Belonging to the field of fracturing fluid, the invention particularly relates to a directly blendable seawater-based variable viscosity fracturing fluid and a preparation method thereof. The fracturing fluid comprises a seawater-based slickwater fracturing fluid and a seawater-based high-viscosity slickwater fracturing fluid; the seawater-based slickwater fracturing fluid comprises the followingcomponents, in terms of the total amount of the seawater-based slickwater fracturing fluid, 0.05%-0.15% of a thickening agent, 0.01%-0.03% of a synergist, 0.1%-0.2% of a bactericide and the balance seawater. The invention solves the problems of small fracturing scale and unsatisfactory fracturing effect caused by limited water storage space in offshore fracturing. Seawater resources are rich, thefracturing fluid can be prepared and used immediately during fracturing construction, thus effectively lowering the water consumption, storage and transportation cost of the fracturing fluid, and greatly shortening the construction period.

Description

technical field [0001] The invention belongs to the field of fracturing fluids, and in particular relates to a seawater-based viscous fracturing fluid that can be directly mixed and a preparation method thereof. Background technique [0002] In recent years, as the proportion of low-permeability reservoirs in domestic offshore oil and gas field exploration and development blocks has gradually increased, offshore oil and gas field fracturing has gradually developed towards well group fracturing and large-scale horizontal well fracturing. Offshore oil and gas fields are rich in seawater resources, and the use of seawater to prepare fracturing fluids is low in cost and can speed up construction progress, which has obvious technical and economic advantages. The preparation of fracturing fluid with seawater has the following advantages: (1) The supply of seawater is sufficient, and seawater fracturing fluid is especially suitable for large-scale fracturing reconstruction of offsh...

AI Technical Summary

Problems solved by technology

In terms of application performance, the three types of seawater-based fracturing fluids are all cross-linked fracturing fluids, which are not suitable for large-scale volume fracturing; the modified guar gum fracturing fluid has high additive concentration, poor cleanliness, high cost, and required preparation conditions. High; polymer fracturing fluid cannot be prepared directly from seawater and requires partial desalination; clean fracturing fluid, the thickener is surfactant, poor temperature resistance, high cost, and cannot meet the needs of high-temperature reservoir fracturing construction

In terms of on-site preparation process, the modified guar gum fracturing fluid and the polymer fracturing fluid thickener are solid, which requires a long swelling time, and the continuous mixing skid cannot accurately weigh the solid additive due to the strong wind and waves at sea. Ocean Fracturing Direct Continuous Mixing

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