MAGNETIC GRANULATED POLYMER COMPOSITION AND METHOD OF ITS USE FOR INTELLIGENT CEMENTING OF WELLS OF CASING STRING Russian patent published in 2020 - IPC C08L7/00 

FIELD: chemistry.

SUBSTANCE: invention relates to polymer compounds, in particular to a magnetic granulated polymer composition which can be used for intelligent cementing of wells. Described is a magnetic granular polymer cementing composition based on an elastic polymer matrix of natural and/or synthetic rubber selected from a range of styrene butadiene, butyl rubber, silicone, chlorinated vinyl chloride, butyl acrylate, polyurethane rubber, copolymers of said rubbers with portland cement additive, and magnetic filler in form of magnetic powder with particle size of 1–100 mcm, such as iron-neodymium-boron NdFeB, and/or magnetite Fe₃O₄, and/or powdered iron, and/or magnetic alloys of iron – iron-cobalt, and/or iron-nickel, and/or permalloy alloy, with the following content of components, pts. wt.: magnetic filler 5–40, portland cement 1–50, polymer matrix 100 and additionally carbon or basalt fibers 0–50, which enables to obtain the following characteristics – density of the magnetic polymer composition 1–3.5 g/cm³, elasticity 0.5–30 MPa, residual magnetization 1–30 Gs⋅cm³/g at operating temperature from -50 to +200 °C. Invention also describes a method for intelligent cementing of wells.

EFFECT: higher quality of well cementing.

5 cl, 5 dwg, 4 tbl, 14 ex