Method for improving cementing plugging effect

Abstract

The invention discloses a method of improving the effect of blocking cement; the G-graded cement is added with short-thread fibres, bridge plug materials, super-thin materials and a retarder; blockage cement grout is injected into a stratum; blockage mud cakes and a cement plug can be formed rapidly in the thief zone of the stratum, which stops the cement grout flowing to the depths of an oil layer, thereby reducing the consumption of the cement grout, protecting the oil layer and lessening the damage to blowholes. Compared with the prior cement grout, the formed paste matrix is of good toughness and shock resistance; the added super-thin materials improve the grain size distribution of the cement grout, reduce the extent of porosity of the paste matrix, and decrease the penetrability of the cement plug, thereby prolonging the service life of the cement plug. Therefore, the adoption of the cement grout and the corresponding craftworks and measures can improve the success ratio of one-time construction of blocking the cement to more than 90 percent, and can prolong the term of validity of blocking to a certain extent. The invention is quite applicable for popularization and application on the spot.

Description

Technical field: [0001] The invention relates to a method for increasing oil well production in oil field production, in particular to a method for improving the plugging effect of cement injection. Background technique: [0002] At present, the plugging and channeling of oil and water wells use simple cement slurry and a small amount of cement slurry admixture to improve performance. These technologies are transplanted from the oil drilling and cementing process. Due to the poor plugging ability of forming cement stones, they cannot be effective. The ground will form a blockage in the appropriate position, resulting in a successful plugging rate of only about 30% in the oil field plugging operation. Currently, the cement slurry used for plugging includes A-grade, G-grade and ultra-fine cement slurries. At present, these muds cannot meet the needs of sealing and channeling of oilfields prone to leakage. . Invention content: [0003] The purpose of the present invention i...

AI Technical Summary

Problems solved by technology

[0002] At present, the plugging and channeling of oil and water wells use simple cement slurry and a small amount of cement slurry admixture to improve performance. These technologies are transplanted from the oil drilling and cementing process. Due to the poor plugging ability of forming cement stones, they cannot be effective. The ground will form a blockage in the appropriate position, resulting in a successful plugging rate of only about 30% in the oil field plugging operation. Currently, the cement slurry used for plugging includes A grade, G grade and ultra-fine cement slurry, etc.

These muds cannot currently meet the needs of sealing and channeling in oilfields that are prone to leakage