Plugging agent, preparing method thereof and oil well casing leakage stopping and channeling blocking method

Abstract

The invention discloses a plugging agent, a preparing method thereof and an oil well casing leakage stopping and channeling blocking method, and relates to the field of oil field construction. The problem that an oil well casing is poor in casing leakage stopping and channeling blocking effect is effectively solved. Raw materials of the plugging agent include a drying agent and water by the mass ratio of (0.8-1.6):(0.8-1.2), wherein the drying agent is prepared from, by mass, 30-50% of ultrafine micropowder, 30-50% of structure formation agent, 4-16% of curing agent, 2-8%of filler and 2-8% of modifier. The plugging agent has the advantages of being high in residing performance, interface bonding strength and channeling resisting strength, small in usage amount and short in construction period in oil well casing leakage stopping and channeling blocking construction.

Description

technical field [0001] The invention relates to the field of oilfield engineering, in particular to a plugging agent and a preparation method thereof, and a method for plugging leakage and channeling of an oil well casing. Background technique [0002] With the continuous deepening of oilfield development and production and long-term exploitation, some old wells have too long service life of oil layer casing, and the cementing cement has not completely sealed the oil layer casing. When perforating, the cement sheath of the perforated well section is shaken Therefore, perforation is caused by corrosion in the free section, sealing section and production layer section of the casing, coupled with special and complex geological conditions, the development of salt-gypsum layer, and the movement of the earth's crust, resulting in deformation and damage of the casing, causing mud and mud to flow out of the formation. Water production, as well as long-term water injection developmen...

AI Technical Summary

Problems solved by technology

However, when the above-mentioned oil well cement and ultra-fine cement are used for oil well casing plugging and channeling, the effect is poor; the main performance is: the plugging agent has poor retention and cannot effectively reside in the plugging layer, resulting in a large amount of plugging; The solid formed by the plugging agent has high brittleness and low pressure resistance, and cannot form a firm interface bond with the surrounding medium, which shortens the effective period of construction; the plugging agent has poor adaptability, safety and reliability, low anti-channeling strength, and cannot quickly form a seal in the plugging target layer. Blockage, not conducive to leak detection of oil well casing

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