A highly stable drag reducer and its preparation method and application

Abstract

The application provides a highly stable drag reducer, prepared from the following raw materials in parts by weight: 40-60 parts of acrylamide monomer, 1-5 parts of crosslinking agent, 1-5 parts of dispersant, 30 parts of water -50 parts, 40-70 parts of oil solvent, 30-60 parts of surfactant, 0.5-0.9 parts of initiator; the crosslinking agent adopts glycidyl ether type crosslinking agent and polyamine crosslinking agent. The drag reducer provided by this application is easy to use on site, has fast dissolution speed, good salt resistance, and product stability of up to 7 months. Compared with common emulsion drag reducers, the product performance has been improved, and it can better meet Long-term storage and long-distance transportation.

Description

technical field [0001] The application relates to the technical field of oilfield chemicals, in particular to a drag reducer with high stability and a preparation method and application thereof. Background technique [0002] Fracturing stimulation is an important process technology in the field of oil and gas field development, and fracturing fluid plays a decisive role in the fracturing construction process. With the development of fracturing technology and the research and development of fracturing fluid, slick water fracturing fluid has been widely used because of its low viscosity and low friction. [0003] Drag reducing agent is a key component in slick water fracturing fluid, which largely determines the performance of slick water fracturing fluid, especially for low-porosity and low-permeability shale reservoirs. The dosage is large, and it needs to be discharged after pressure, so the performance of the drag reducer is also required. At present, polyacrylamide type...

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Problems solved by technology

[0004] However, the existing polyacrylamide drag reducers still have the following problems: when formulated into slick water for use in low-porosity and low-permeability shale reservoirs, the sand-carrying capacity is limited, which is not conducive to the dispersion of proppant; Contains a large amount of salt ions, such as Na + , Mg 2+ , Ca 2+ , while the drag reduction rate of existing polyacrylamide-based drag reducers drops significantly in the flowback liquid containing salt ions, that is, the salt resistance is poor; while the existing polymers with good salt resistance or good sand-carrying ability The drag reducer has a large molecular weight and viscosity, and is prone to adsorption and retention in the rock fracture wall and matrix pores, thereby causing great damage to the shale reservoir; the emulsion drag reducer that has not been formulated into slick water has a short stability time at room temperature. Delamination usually occurs in about 2 months, greatly weakening its drag reduction ability, which is not conducive to long-term storage and long-distance transportation. If it is directly made into slippery aquatic products, the selectivity is small, and it is not convenient for on-site preparation and use. Limitations its application

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