Self-healing latex cementing cement slurry and its preparation and application

Abstract

The invention discloses a self-repairing latex well cementation cement slurry system which consists of a well cementation self-repairing agent, oil well cement, well cementation latex, a cement slurry dispersant, a cement slurry filtration agent, a defoaming agent and a liquid, wherein the well cementation repairing agent is a rare earth coordination type oil and gas well cementation cement ring self-repairing agent or silane coupling agent-coated self-repairing agent or cement-based capillary crystalline type waterproof material masterbatch; the rare earth coordination type oil and gas well cementation cement ring self-repairing agent consists of an active mineral and a rare earth coordination type surface treating agent; and the silane coupling agent-coated self-repairing agent consists of an active mineral and a silane coupling agent. The invention also provides a preparation method of the self-repairing latex well cementation cement slurry. The self-repairing latex well cementation cement slurry system disclosed by the invention has the basic performance of the latex well cementation cement slurry as well as a self-repairing function, and can realize automatic repair of the damage of the well cementation cement ring such as microcrack and microgap so as to improve the performance of the latex well cementation cement slurry.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, in particular to a self-repairing latex well cementing cement slurry and its preparation and application. Background technique [0002] The latex cement slurry system is mainly used to prevent gas channeling in the cementing of oil and gas wells and to prevent acid gas from corroding the cement sheath. Latex has obvious advantages in anti-channeling, anti-corrosion, and improving the mechanical properties of cement stones. It has been widely used abroad, and more and more domestic applications. [0003] But, also there are some shortcomings in this system of using at present, mainly: [0004] 1. The existing latex cementing fluid has no self-healing ability to the micro-gap and micro-cracks formed by the cement sheath damage, so the improvement effect on the integrity and durability of the cement sheath is still limited; [0005] 2. The anti-gas channeling and toughening and anti-cra...

AI Technical Summary

Problems solved by technology

[0004] 1. The existing latex cementing fluid has no self-healing ability to the micro-gap and micro-cracks formed by the cement sheath damage, so the improvement effect on the integrity and durability of the cement sheath is still limited;

[0005] 2. The anti-gas channeling and toughening and anti-crack properties of the existing latex cementing fluid still need to be further improved, and cannot meet the requirements of gas channeling prevention, corrosion resistance and damage resistance in complex wells and gas storage wells

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