Double action air leakage prevention agent for oil-gas well cementing, method for preparation and use thereof

Abstract

The present invention relates to a double-acting air leakage prevention agent used for oil-gas well cementing, method for preparing same and use thereof. Said air leakage prevention agent can not only effectively compensate for reducing of pore pressure during the cement paste condensation process, but also increase the air leakage resistance force of cement paste. Said air leakage prevention agent consists of modified polyvinyl alcohol, carboxyl alkylation cellulose, plasticizer, amorphous active silicon and pretreated aluminum micro powder. The process for producing the air leakage prevention agent is as follows: adding the amorphous active silicon into the polyvinyl alcohol solution to form a stable toughness liquid assumed as component A; mixing the pretreated aluminum micro powder, the plasticizer, the carboxyl alkylation cellulose, the amorphous active silicon and water according to proportions to form a paste assumed as component B; mixing the component A and the component B proportionally to get a viscous liquid product-the double-acting air leakage prevention agent. In combination with dispersing agents and retarders, the air leakage prevention agent can be used to make a cement paste system with double-acting air leakage preventing functions. Said air leakage prevention agent is used principally for casing and cementing of oil gas wells and is characterized by its strong air leakage preventing capability, small loss during filtrations and excellent paste stability.

Description

technical field [0001] The invention relates to a double-acting anti-gas channeling agent used in oil and gas well cementing, which can effectively compensate for the pressure drop in the cement slurry coagulation process and increase the gas channeling resistance of the cement slurry, which belongs to an additive used in well cementing engineering. Background technique [0002] In the process of exploration and development of oil and gas fields, cementing engineering is an important part of drilling and completion engineering. The quality of cementing is not only the prerequisite for the normal implementation of engineering operations such as follow-up exploitation and enhanced reservoir stimulation, but also the normal operation of Yanchang oil and gas wells. It is an important guarantee for production life, discovery and full increase of production capacity, and improvement of oil and gas field exploration and development benefits. In the process of cementing and waiting ...

AI Technical Summary

Problems solved by technology

However, for the cementing of oil and gas water layers with high gas channeling potential, especially the anti-gas channeling cement slurry technology under high temperature conditions, it is urgent to further study and solve, and the existing cement slurry anti-gas channeling additives and the anti-gas channeling of the cement slurry system The principle of gas channeling is simple, either by increasing the effective pressure during the cement slurry coagulation process to reduce the "weight loss" to prevent gas channeling, or by increasing the resistance of formation fluid intruding into the cement slurry matrix and reducing the potential for gas channeling , there is no anti-gas channeling additive and its cement slurry system that can not only increase the effective pressure to prevent weight loss, but also increase the gas invasion resistance, so its anti-gas channeling ability is limited, especially the high gas channeling potential and anti-gas channeling process measures It is difficult to ensure the quality of cementing when the applications such as annular back pressure and double-setting cement are limited.