A kind of additive and working fluid for preventing epoxy resin-based downhole working fluid solid phase particle sedimentation

Abstract

The invention belongs to the field of cementing materials for oil and gas wells, and particularly relates to an additive and a working fluid for preventing the sedimentation of solid-phase particles of an epoxy resin-based downhole working fluid. The additive, in parts by weight, is composed of raw materials: 10-20 parts of solid epoxy resin; 0-20 parts of diluent; 1-3 parts of solid tackifier; 5-15 parts of thixotropic rheological agent; 1 to 3 parts of pseudoplastic rheological agent. The additive of the present invention selects solid tackifier to increase viscosity, liquid diluent to reduce viscosity, and utilizes the difference in performance between tackifier and diluent at different temperatures, so that the viscosity of the system is reduced at room temperature, and the viscosity is increased at high temperature. The viscosity difference of resin-based downhole working fluid at high and low temperature. The invention can solve the problem of settlement stability that may occur when the epoxy resin-based downhole working fluid carries high-density solid phase particles, can save operation time and cost, and can be used for sidetracking, cementing and repairing of old wells using epoxy resin materials. Provide technical support for downhole operations such as wells.

Description

technical field [0001] The invention belongs to the field of cementing materials for oil and gas wells, and in particular relates to an additive and a working fluid for preventing the sedimentation of solid-phase particles of epoxy resin-based downhole working fluids. The additive of the invention is suitable for epoxy resin-based downhole working fluids (such as solid Well fluid, workover fluid, cement ring crack repair fluid, etc.), which can keep solid phase fillers, additives, etc. carried and suspended in the downhole working fluid stably suspended and improve the settlement stability of the system. Background technique [0002] Cement-based materials have the characteristics of high strength, easy access to raw materials, and simple production, but they also have the disadvantages of high brittleness, insufficient toughness, poor corrosion resistance, and insufficient durability. Under special applications and requirements such as cement extrusion, sidetracking in old ...

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to solve the problem of stable suspension of solid phase particles of epoxy resin-based downhole working fluid under the downhole working conditions of oil and gas wells, and provides an additive and working fluid for preventing the settlement of solid phase particles of epoxy resin-based downhole working fluid. Starting from the perspective of viscosity, rheology and thixotropy, the solid phase particles in the epoxy resin-based downhole working fluid remain stable during the process of injecting downhole from the surface, and are not affected by large temperature differences to avoid settlement

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