Shallow-layer plugging agent

Abstract

The invention relates to a shallow-layer plugging agent. Oil-well cement is used as a substrate, a fluid loss agent, a dispersant, an active agent and a modifier are added, the plugging agent is mainly characterized in that additives are used for changing conventional cement paste performance, so that the construction requirement of plugging, perforation plugging and non-plug perforation plugging is met, in the plugging construction process, a specific construction technology is adopted, the one-time plugging success rate is increased effectively, shallow-layer plugging agent slurry in casings can be circulated out of the ground, and plugging agent plugs are not reserved.

Description

technical field [0001] The invention belongs to the application method of wellbore oil layer transformation and rupture repair in the process of petroleum exploration and development, and in particular relates to a shallow layer plugging agent. Background technique [0002] For a long time, in the process of using cement slurry to plug leaks and plug blastholes, because the basic characteristics of cement slurry cannot meet the requirements of special operations in the downhole of oil wells, field problems such as low cement operation success rate and short validity period often occur, and "plugging" may also occur. Flagpole” and other vicious accidents. In addition, oil, gas, and water wells must drill cement plugs to plug blastholes. In this way, while increasing operating costs, the process of drilling cement plugs will cause two hazards: one is the wear of the drill bit on the original well casing; two It is the vibration generated during the drilling process that will b...

AI Technical Summary

Problems solved by technology

[0002] For a long time, in the process of using cement slurry to plug leaks and plug blastholes, because the basic characteristics of cement slurry cannot meet the requirements of special operations in the downhole of oil wells, field problems such as low cement operation success rate and short validity period often occur, and "plugging" may also occur. Flagpole” and other vicious accidents. In addition, oil, gas, and water wells must drill cement plugs to plug blastholes. In this way, while increasing operating costs, the process of drilling cement plugs will cause two hazards: one is the wear of the drill bit on the original well casing; two It is the vibration generated during the drilling process that will break the cement stone around the blast hole, which reduces the validity period of the blast hole plugging, and even causes the blast hole to fail to be blocked

[0003] The technical formula of conventional cement for plugging blastholes and plugging leaks is 1% retarder + 0.8% expansion agent, which cannot change the basic characteristics of oil well cement and cannot meet the construction process requirements for plugging blastholes and leaks during downhole operations! In the process of plugging construction, limited by the performance of conventional cement formulations, only one-time cement injection technology can be used to inject all the prepared cement slurry into the plugging section, which cannot improve the plugging effect. Purpose