Slurry for extracting and plugging operation of oil and gas fields and using method thereof

Abstract

The invention relates to slurry for the extracting and plugging operation of oil and gas fields and a using method thereof. The slurry is composed of raw materials such as superfine cement, superfine slag, superfine silica powder, gypsum and fly ash. The using method comprises the following steps of: uniformly mixing the superfine cement, the superfine slag, the superfine silica powder, the gypsum and the fly ash, then adding water to the mixed raw materials, and uniformly mixing the raw materials to form the slurry for use. The slurry for the extracting and plugging operation of the oil and gas fields has reasonable design and is low in cost and long in service life. The slurry has the advantages of having high supporting strength on holes, being capable of filling the cracks of the inner wall of the holes, being safe and pollution-free, being simple and convenient in manufacturing and use and the like.

Description

technical field [0001] The invention relates to a slurry in the field of oil and gas fields, in particular to a slurry for oil and gas field mining and sealing operations and a use method thereof. Background technique [0002] In oil and gas field recovery and sealing operations, drilling machines are required to drill holes. In order to avoid hole collapse, grout needs to be poured into the holes to support the hole walls. At present, the commonly used slurry is made by mixing and stirring three kinds of raw materials: ultra-fine cement, ultra-fine slag and ultra-fine silicon powder. The specific surface area of ​​the ultra-fine cement and ultra-fine slag is 650, and the particle size The thickness is 0.2 μm. Since the slurry is relatively fine, it is in a suspended state in water and is easy to be layered. Therefore, the existing slurry has a poor effect of supporting holes and has a short service life. In addition, the oil and gas will generate greater pressure on the in...

AI Technical Summary

Problems solved by technology

At present, the commonly used slurry is made by mixing and stirring three kinds of raw materials: ultra-fine cement, ultra-fine slag and ultra-fine silicon powder. The specific surface area of ​​the ultra-fine cement and ultra-fine slag is 650, and the particle size 0.2μm, because the slurry is relatively fine, it is suspended in water, and it is easy to layer, so the existing slurry has a poor effect on supporting holes and has a short service life.

In addition, the oil and gas will generate a large pressure on the inner wall of the hole, and cracks will be formed on the inner wall. The existing slurry cannot fill the gap.

At present, an organic additive has appeared, which has a good supporting and gap-filling effect, but the organic additive is toxic, and if it remains in the soil, it will have a negative impact on the surrounding soil and water quality, and damage the ecological environment