HYBRID COMPOSITE ROD Russian patent published in 2022 - IPC E04C5/07 E21B17/22 

FIELD: construction.

SUBSTANCE: invention relates to the construction, namely the design of the sucker rod sucker rod downhole pump oilfield equipment. In a hybrid composite rod, consisting of continuous low-modulus and high-modulus fibers assembled into a single rod with a multicomponent epoxy binder, the content of the multicomponent epoxy binder is 28-32%, and the relative volume content of high-modulus fibers is 38-55% of the volume of the composite rod. Modulus of elasticity of a unidirectional hybrid rod body is calculated by the formula: Е_eff = Е_В ⋅ ν ⋅ ψ_В + Е_C ⋅ ν ⋅ ψ_C + Е_М ⋅ (1- ν), where Е_eff is the effective modulus of elasticity, Е_В is the modulus of elasticity of low-modulus fibers, ν is the volumetric filling factor, ψ_В is the relative volume content of low-modulus fibers in the rod body, Е_C is the modulus of elasticity of high-modulus fibers, ψ_C is the relative volume content of high-modulus fibers in the body of the rod, Е_М is the modulus of elasticity of the epoxy binder. The ultimate strength in the longitudinal direction is calculated based on the relative volume content of low modulus fiber depending on the critical content of low modulus fiber, with the predominance of the relative volume content of low modulus fiber, the ultimate strength in the longitudinal direction is calculated by the formula: σ₁ = (Е_В ⋅ ν ⋅ ψ_В + Е_М ⋅ (1- ν)) ⋅ ε_В, with the predominance of the critical content of low-modulus fiber, the tensile strength is calculated by the formula: σ₁ = Е_eff ⋅ εC, where σ₁ is the ultimate strength in the longitudinal direction, ε_В is the ultimate strain of a low-modulus fiber in tension, εc is the ultimate strain of a high-modulus fiber in tension, and the critical content of a low-modulus fiber is calculated by the formula:

where ψ_Вcrit is the critical content of high-modulus fiber.

EFFECT: increase in the modulus of elasticity and tensile strength of the composite body of the rod and the possibility of their regulation.

1 cl, 1 tbl, 3 dwg